diff options
Diffstat (limited to 'gcc-4.8.1/gcc/go/gofrontend/types.cc')
| -rw-r--r-- | gcc-4.8.1/gcc/go/gofrontend/types.cc | 9819 |
1 files changed, 0 insertions, 9819 deletions
diff --git a/gcc-4.8.1/gcc/go/gofrontend/types.cc b/gcc-4.8.1/gcc/go/gofrontend/types.cc deleted file mode 100644 index 769498282..000000000 --- a/gcc-4.8.1/gcc/go/gofrontend/types.cc +++ /dev/null @@ -1,9819 +0,0 @@ -// types.cc -- Go frontend types. - -// Copyright 2009 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -#include "go-system.h" - -#include "toplev.h" -#include "intl.h" -#include "tree.h" -#include "gimple.h" -#include "real.h" -#include "convert.h" - -#include "go-c.h" -#include "gogo.h" -#include "operator.h" -#include "expressions.h" -#include "statements.h" -#include "export.h" -#include "import.h" -#include "backend.h" -#include "types.h" - -// Forward declarations so that we don't have to make types.h #include -// backend.h. - -static void -get_backend_struct_fields(Gogo* gogo, const Struct_field_list* fields, - bool use_placeholder, - std::vector<Backend::Btyped_identifier>* bfields); - -static void -get_backend_slice_fields(Gogo* gogo, Array_type* type, bool use_placeholder, - std::vector<Backend::Btyped_identifier>* bfields); - -static void -get_backend_interface_fields(Gogo* gogo, Interface_type* type, - bool use_placeholder, - std::vector<Backend::Btyped_identifier>* bfields); - -// Class Type. - -Type::Type(Type_classification classification) - : classification_(classification), btype_(NULL), type_descriptor_var_(NULL) -{ -} - -Type::~Type() -{ -} - -// Get the base type for a type--skip names and forward declarations. - -Type* -Type::base() -{ - switch (this->classification_) - { - case TYPE_NAMED: - return this->named_type()->named_base(); - case TYPE_FORWARD: - return this->forward_declaration_type()->real_type()->base(); - default: - return this; - } -} - -const Type* -Type::base() const -{ - switch (this->classification_) - { - case TYPE_NAMED: - return this->named_type()->named_base(); - case TYPE_FORWARD: - return this->forward_declaration_type()->real_type()->base(); - default: - return this; - } -} - -// Skip defined forward declarations. - -Type* -Type::forwarded() -{ - Type* t = this; - Forward_declaration_type* ftype = t->forward_declaration_type(); - while (ftype != NULL && ftype->is_defined()) - { - t = ftype->real_type(); - ftype = t->forward_declaration_type(); - } - return t; -} - -const Type* -Type::forwarded() const -{ - const Type* t = this; - const Forward_declaration_type* ftype = t->forward_declaration_type(); - while (ftype != NULL && ftype->is_defined()) - { - t = ftype->real_type(); - ftype = t->forward_declaration_type(); - } - return t; -} - -// If this is a named type, return it. Otherwise, return NULL. - -Named_type* -Type::named_type() -{ - return this->forwarded()->convert_no_base<Named_type, TYPE_NAMED>(); -} - -const Named_type* -Type::named_type() const -{ - return this->forwarded()->convert_no_base<const Named_type, TYPE_NAMED>(); -} - -// Return true if this type is not defined. - -bool -Type::is_undefined() const -{ - return this->forwarded()->forward_declaration_type() != NULL; -} - -// Return true if this is a basic type: a type which is not composed -// of other types, and is not void. - -bool -Type::is_basic_type() const -{ - switch (this->classification_) - { - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_BOOLEAN: - case TYPE_STRING: - case TYPE_NIL: - return true; - - case TYPE_ERROR: - case TYPE_VOID: - case TYPE_FUNCTION: - case TYPE_POINTER: - case TYPE_STRUCT: - case TYPE_ARRAY: - case TYPE_MAP: - case TYPE_CHANNEL: - case TYPE_INTERFACE: - return false; - - case TYPE_NAMED: - case TYPE_FORWARD: - return this->base()->is_basic_type(); - - default: - go_unreachable(); - } -} - -// Return true if this is an abstract type. - -bool -Type::is_abstract() const -{ - switch (this->classification()) - { - case TYPE_INTEGER: - return this->integer_type()->is_abstract(); - case TYPE_FLOAT: - return this->float_type()->is_abstract(); - case TYPE_COMPLEX: - return this->complex_type()->is_abstract(); - case TYPE_STRING: - return this->is_abstract_string_type(); - case TYPE_BOOLEAN: - return this->is_abstract_boolean_type(); - default: - return false; - } -} - -// Return a non-abstract version of an abstract type. - -Type* -Type::make_non_abstract_type() -{ - go_assert(this->is_abstract()); - switch (this->classification()) - { - case TYPE_INTEGER: - if (this->integer_type()->is_rune()) - return Type::lookup_integer_type("int32"); - else - return Type::lookup_integer_type("int"); - case TYPE_FLOAT: - return Type::lookup_float_type("float64"); - case TYPE_COMPLEX: - return Type::lookup_complex_type("complex128"); - case TYPE_STRING: - return Type::lookup_string_type(); - case TYPE_BOOLEAN: - return Type::lookup_bool_type(); - default: - go_unreachable(); - } -} - -// Return true if this is an error type. Don't give an error if we -// try to dereference an undefined forwarding type, as this is called -// in the parser when the type may legitimately be undefined. - -bool -Type::is_error_type() const -{ - const Type* t = this->forwarded(); - // Note that we return false for an undefined forward type. - switch (t->classification_) - { - case TYPE_ERROR: - return true; - case TYPE_NAMED: - return t->named_type()->is_named_error_type(); - default: - return false; - } -} - -// If this is a pointer type, return the type to which it points. -// Otherwise, return NULL. - -Type* -Type::points_to() const -{ - const Pointer_type* ptype = this->convert<const Pointer_type, - TYPE_POINTER>(); - return ptype == NULL ? NULL : ptype->points_to(); -} - -// Return whether this is an open array type. - -bool -Type::is_slice_type() const -{ - return this->array_type() != NULL && this->array_type()->length() == NULL; -} - -// Return whether this is the predeclared constant nil being used as a -// type. - -bool -Type::is_nil_constant_as_type() const -{ - const Type* t = this->forwarded(); - if (t->forward_declaration_type() != NULL) - { - const Named_object* no = t->forward_declaration_type()->named_object(); - if (no->is_unknown()) - no = no->unknown_value()->real_named_object(); - if (no != NULL - && no->is_const() - && no->const_value()->expr()->is_nil_expression()) - return true; - } - return false; -} - -// Traverse a type. - -int -Type::traverse(Type* type, Traverse* traverse) -{ - go_assert((traverse->traverse_mask() & Traverse::traverse_types) != 0 - || (traverse->traverse_mask() - & Traverse::traverse_expressions) != 0); - if (traverse->remember_type(type)) - { - // We have already traversed this type. - return TRAVERSE_CONTINUE; - } - if ((traverse->traverse_mask() & Traverse::traverse_types) != 0) - { - int t = traverse->type(type); - if (t == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - else if (t == TRAVERSE_SKIP_COMPONENTS) - return TRAVERSE_CONTINUE; - } - // An array type has an expression which we need to traverse if - // traverse_expressions is set. - if (type->do_traverse(traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - return TRAVERSE_CONTINUE; -} - -// Default implementation for do_traverse for child class. - -int -Type::do_traverse(Traverse*) -{ - return TRAVERSE_CONTINUE; -} - -// Return whether two types are identical. If ERRORS_ARE_IDENTICAL, -// then return true for all erroneous types; this is used to avoid -// cascading errors. If REASON is not NULL, optionally set *REASON to -// the reason the types are not identical. - -bool -Type::are_identical(const Type* t1, const Type* t2, bool errors_are_identical, - std::string* reason) -{ - if (t1 == NULL || t2 == NULL) - { - // Something is wrong. - return errors_are_identical ? true : t1 == t2; - } - - // Skip defined forward declarations. - t1 = t1->forwarded(); - t2 = t2->forwarded(); - - // Ignore aliases for purposes of type identity. - if (t1->named_type() != NULL && t1->named_type()->is_alias()) - t1 = t1->named_type()->real_type(); - if (t2->named_type() != NULL && t2->named_type()->is_alias()) - t2 = t2->named_type()->real_type(); - - if (t1 == t2) - return true; - - // An undefined forward declaration is an error. - if (t1->forward_declaration_type() != NULL - || t2->forward_declaration_type() != NULL) - return errors_are_identical; - - // Avoid cascading errors with error types. - if (t1->is_error_type() || t2->is_error_type()) - { - if (errors_are_identical) - return true; - return t1->is_error_type() && t2->is_error_type(); - } - - // Get a good reason for the sink type. Note that the sink type on - // the left hand side of an assignment is handled in are_assignable. - if (t1->is_sink_type() || t2->is_sink_type()) - { - if (reason != NULL) - *reason = "invalid use of _"; - return false; - } - - // A named type is only identical to itself. - if (t1->named_type() != NULL || t2->named_type() != NULL) - return false; - - // Check type shapes. - if (t1->classification() != t2->classification()) - return false; - - switch (t1->classification()) - { - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_STRING: - case TYPE_NIL: - // These types are always identical. - return true; - - case TYPE_INTEGER: - return t1->integer_type()->is_identical(t2->integer_type()); - - case TYPE_FLOAT: - return t1->float_type()->is_identical(t2->float_type()); - - case TYPE_COMPLEX: - return t1->complex_type()->is_identical(t2->complex_type()); - - case TYPE_FUNCTION: - return t1->function_type()->is_identical(t2->function_type(), - false, - errors_are_identical, - reason); - - case TYPE_POINTER: - return Type::are_identical(t1->points_to(), t2->points_to(), - errors_are_identical, reason); - - case TYPE_STRUCT: - return t1->struct_type()->is_identical(t2->struct_type(), - errors_are_identical); - - case TYPE_ARRAY: - return t1->array_type()->is_identical(t2->array_type(), - errors_are_identical); - - case TYPE_MAP: - return t1->map_type()->is_identical(t2->map_type(), - errors_are_identical); - - case TYPE_CHANNEL: - return t1->channel_type()->is_identical(t2->channel_type(), - errors_are_identical); - - case TYPE_INTERFACE: - return t1->interface_type()->is_identical(t2->interface_type(), - errors_are_identical); - - case TYPE_CALL_MULTIPLE_RESULT: - if (reason != NULL) - *reason = "invalid use of multiple-value function call"; - return false; - - default: - go_unreachable(); - } -} - -// Return true if it's OK to have a binary operation with types LHS -// and RHS. This is not used for shifts or comparisons. - -bool -Type::are_compatible_for_binop(const Type* lhs, const Type* rhs) -{ - if (Type::are_identical(lhs, rhs, true, NULL)) - return true; - - // A constant of abstract bool type may be mixed with any bool type. - if ((rhs->is_abstract_boolean_type() && lhs->is_boolean_type()) - || (lhs->is_abstract_boolean_type() && rhs->is_boolean_type())) - return true; - - // A constant of abstract string type may be mixed with any string - // type. - if ((rhs->is_abstract_string_type() && lhs->is_string_type()) - || (lhs->is_abstract_string_type() && rhs->is_string_type())) - return true; - - lhs = lhs->base(); - rhs = rhs->base(); - - // A constant of abstract integer, float, or complex type may be - // mixed with an integer, float, or complex type. - if ((rhs->is_abstract() - && (rhs->integer_type() != NULL - || rhs->float_type() != NULL - || rhs->complex_type() != NULL) - && (lhs->integer_type() != NULL - || lhs->float_type() != NULL - || lhs->complex_type() != NULL)) - || (lhs->is_abstract() - && (lhs->integer_type() != NULL - || lhs->float_type() != NULL - || lhs->complex_type() != NULL) - && (rhs->integer_type() != NULL - || rhs->float_type() != NULL - || rhs->complex_type() != NULL))) - return true; - - // The nil type may be compared to a pointer, an interface type, a - // slice type, a channel type, a map type, or a function type. - if (lhs->is_nil_type() - && (rhs->points_to() != NULL - || rhs->interface_type() != NULL - || rhs->is_slice_type() - || rhs->map_type() != NULL - || rhs->channel_type() != NULL - || rhs->function_type() != NULL)) - return true; - if (rhs->is_nil_type() - && (lhs->points_to() != NULL - || lhs->interface_type() != NULL - || lhs->is_slice_type() - || lhs->map_type() != NULL - || lhs->channel_type() != NULL - || lhs->function_type() != NULL)) - return true; - - return false; -} - -// Return true if a value with type T1 may be compared with a value of -// type T2. IS_EQUALITY_OP is true for == or !=, false for <, etc. - -bool -Type::are_compatible_for_comparison(bool is_equality_op, const Type *t1, - const Type *t2, std::string *reason) -{ - if (t1 != t2 - && !Type::are_assignable(t1, t2, NULL) - && !Type::are_assignable(t2, t1, NULL)) - { - if (reason != NULL) - *reason = "incompatible types in binary expression"; - return false; - } - - if (!is_equality_op) - { - if (t1->integer_type() == NULL - && t1->float_type() == NULL - && !t1->is_string_type()) - { - if (reason != NULL) - *reason = _("invalid comparison of non-ordered type"); - return false; - } - } - else if (t1->is_slice_type() - || t1->map_type() != NULL - || t1->function_type() != NULL - || t2->is_slice_type() - || t2->map_type() != NULL - || t2->function_type() != NULL) - { - if (!t1->is_nil_type() && !t2->is_nil_type()) - { - if (reason != NULL) - { - if (t1->is_slice_type() || t2->is_slice_type()) - *reason = _("slice can only be compared to nil"); - else if (t1->map_type() != NULL || t2->map_type() != NULL) - *reason = _("map can only be compared to nil"); - else - *reason = _("func can only be compared to nil"); - - // Match 6g error messages. - if (t1->interface_type() != NULL || t2->interface_type() != NULL) - { - char buf[200]; - snprintf(buf, sizeof buf, _("invalid operation (%s)"), - reason->c_str()); - *reason = buf; - } - } - return false; - } - } - else - { - if (!t1->is_boolean_type() - && t1->integer_type() == NULL - && t1->float_type() == NULL - && t1->complex_type() == NULL - && !t1->is_string_type() - && t1->points_to() == NULL - && t1->channel_type() == NULL - && t1->interface_type() == NULL - && t1->struct_type() == NULL - && t1->array_type() == NULL - && !t1->is_nil_type()) - { - if (reason != NULL) - *reason = _("invalid comparison of non-comparable type"); - return false; - } - - if (t1->named_type() != NULL) - return t1->named_type()->named_type_is_comparable(reason); - else if (t2->named_type() != NULL) - return t2->named_type()->named_type_is_comparable(reason); - else if (t1->struct_type() != NULL) - { - const Struct_field_list* fields = t1->struct_type()->fields(); - for (Struct_field_list::const_iterator p = fields->begin(); - p != fields->end(); - ++p) - { - if (Gogo::is_sink_name(p->field_name())) - continue; - - if (!p->type()->is_comparable()) - { - if (reason != NULL) - *reason = _("invalid comparison of non-comparable struct"); - return false; - } - } - } - else if (t1->array_type() != NULL) - { - if (t1->array_type()->length()->is_nil_expression() - || !t1->array_type()->element_type()->is_comparable()) - { - if (reason != NULL) - *reason = _("invalid comparison of non-comparable array"); - return false; - } - } - } - - return true; -} - -// Return true if a value with type RHS may be assigned to a variable -// with type LHS. If CHECK_HIDDEN_FIELDS is true, check whether any -// hidden fields are modified. If REASON is not NULL, set *REASON to -// the reason the types are not assignable. - -bool -Type::are_assignable_check_hidden(const Type* lhs, const Type* rhs, - bool check_hidden_fields, - std::string* reason) -{ - // Do some checks first. Make sure the types are defined. - if (rhs != NULL && !rhs->is_undefined()) - { - if (rhs->is_void_type()) - { - if (reason != NULL) - *reason = "non-value used as value"; - return false; - } - if (rhs->is_call_multiple_result_type()) - { - if (reason != NULL) - reason->assign(_("multiple-value function call in " - "single-value context")); - return false; - } - } - - if (lhs != NULL && !lhs->is_undefined()) - { - // Any value may be assigned to the blank identifier. - if (lhs->is_sink_type()) - return true; - - // All fields of a struct must be exported, or the assignment - // must be in the same package. - if (check_hidden_fields && rhs != NULL && !rhs->is_undefined()) - { - if (lhs->has_hidden_fields(NULL, reason) - || rhs->has_hidden_fields(NULL, reason)) - return false; - } - } - - // Identical types are assignable. - if (Type::are_identical(lhs, rhs, true, reason)) - return true; - - // The types are assignable if they have identical underlying types - // and either LHS or RHS is not a named type. - if (((lhs->named_type() != NULL && rhs->named_type() == NULL) - || (rhs->named_type() != NULL && lhs->named_type() == NULL)) - && Type::are_identical(lhs->base(), rhs->base(), true, reason)) - return true; - - // The types are assignable if LHS is an interface type and RHS - // implements the required methods. - const Interface_type* lhs_interface_type = lhs->interface_type(); - if (lhs_interface_type != NULL) - { - if (lhs_interface_type->implements_interface(rhs, reason)) - return true; - const Interface_type* rhs_interface_type = rhs->interface_type(); - if (rhs_interface_type != NULL - && lhs_interface_type->is_compatible_for_assign(rhs_interface_type, - reason)) - return true; - } - - // The type are assignable if RHS is a bidirectional channel type, - // LHS is a channel type, they have identical element types, and - // either LHS or RHS is not a named type. - if (lhs->channel_type() != NULL - && rhs->channel_type() != NULL - && rhs->channel_type()->may_send() - && rhs->channel_type()->may_receive() - && (lhs->named_type() == NULL || rhs->named_type() == NULL) - && Type::are_identical(lhs->channel_type()->element_type(), - rhs->channel_type()->element_type(), - true, - reason)) - return true; - - // The nil type may be assigned to a pointer, function, slice, map, - // channel, or interface type. - if (rhs->is_nil_type() - && (lhs->points_to() != NULL - || lhs->function_type() != NULL - || lhs->is_slice_type() - || lhs->map_type() != NULL - || lhs->channel_type() != NULL - || lhs->interface_type() != NULL)) - return true; - - // An untyped numeric constant may be assigned to a numeric type if - // it is representable in that type. - if ((rhs->is_abstract() - && (rhs->integer_type() != NULL - || rhs->float_type() != NULL - || rhs->complex_type() != NULL)) - && (lhs->integer_type() != NULL - || lhs->float_type() != NULL - || lhs->complex_type() != NULL)) - return true; - - // Give some better error messages. - if (reason != NULL && reason->empty()) - { - if (rhs->interface_type() != NULL) - reason->assign(_("need explicit conversion")); - else if (lhs->named_type() != NULL && rhs->named_type() != NULL) - { - size_t len = (lhs->named_type()->name().length() - + rhs->named_type()->name().length() - + 100); - char* buf = new char[len]; - snprintf(buf, len, _("cannot use type %s as type %s"), - rhs->named_type()->message_name().c_str(), - lhs->named_type()->message_name().c_str()); - reason->assign(buf); - delete[] buf; - } - } - - return false; -} - -// Return true if a value with type RHS may be assigned to a variable -// with type LHS. If REASON is not NULL, set *REASON to the reason -// the types are not assignable. - -bool -Type::are_assignable(const Type* lhs, const Type* rhs, std::string* reason) -{ - return Type::are_assignable_check_hidden(lhs, rhs, false, reason); -} - -// Like are_assignable but don't check for hidden fields. - -bool -Type::are_assignable_hidden_ok(const Type* lhs, const Type* rhs, - std::string* reason) -{ - return Type::are_assignable_check_hidden(lhs, rhs, false, reason); -} - -// Return true if a value with type RHS may be converted to type LHS. -// If REASON is not NULL, set *REASON to the reason the types are not -// convertible. - -bool -Type::are_convertible(const Type* lhs, const Type* rhs, std::string* reason) -{ - // The types are convertible if they are assignable. - if (Type::are_assignable(lhs, rhs, reason)) - return true; - - // The types are convertible if they have identical underlying - // types. - if ((lhs->named_type() != NULL || rhs->named_type() != NULL) - && Type::are_identical(lhs->base(), rhs->base(), true, reason)) - return true; - - // The types are convertible if they are both unnamed pointer types - // and their pointer base types have identical underlying types. - if (lhs->named_type() == NULL - && rhs->named_type() == NULL - && lhs->points_to() != NULL - && rhs->points_to() != NULL - && (lhs->points_to()->named_type() != NULL - || rhs->points_to()->named_type() != NULL) - && Type::are_identical(lhs->points_to()->base(), - rhs->points_to()->base(), - true, - reason)) - return true; - - // Integer and floating point types are convertible to each other. - if ((lhs->integer_type() != NULL || lhs->float_type() != NULL) - && (rhs->integer_type() != NULL || rhs->float_type() != NULL)) - return true; - - // Complex types are convertible to each other. - if (lhs->complex_type() != NULL && rhs->complex_type() != NULL) - return true; - - // An integer, or []byte, or []rune, may be converted to a string. - if (lhs->is_string_type()) - { - if (rhs->integer_type() != NULL) - return true; - if (rhs->is_slice_type()) - { - const Type* e = rhs->array_type()->element_type()->forwarded(); - if (e->integer_type() != NULL - && (e->integer_type()->is_byte() - || e->integer_type()->is_rune())) - return true; - } - } - - // A string may be converted to []byte or []rune. - if (rhs->is_string_type() && lhs->is_slice_type()) - { - const Type* e = lhs->array_type()->element_type()->forwarded(); - if (e->integer_type() != NULL - && (e->integer_type()->is_byte() || e->integer_type()->is_rune())) - return true; - } - - // An unsafe.Pointer type may be converted to any pointer type or to - // uintptr, and vice-versa. - if (lhs->is_unsafe_pointer_type() - && (rhs->points_to() != NULL - || (rhs->integer_type() != NULL - && rhs->forwarded() == Type::lookup_integer_type("uintptr")))) - return true; - if (rhs->is_unsafe_pointer_type() - && (lhs->points_to() != NULL - || (lhs->integer_type() != NULL - && lhs->forwarded() == Type::lookup_integer_type("uintptr")))) - return true; - - // Give a better error message. - if (reason != NULL) - { - if (reason->empty()) - *reason = "invalid type conversion"; - else - { - std::string s = "invalid type conversion ("; - s += *reason; - s += ')'; - *reason = s; - } - } - - return false; -} - -// Return whether this type has any hidden fields. This is only a -// possibility for a few types. - -bool -Type::has_hidden_fields(const Named_type* within, std::string* reason) const -{ - switch (this->forwarded()->classification_) - { - case TYPE_NAMED: - return this->named_type()->named_type_has_hidden_fields(reason); - case TYPE_STRUCT: - return this->struct_type()->struct_has_hidden_fields(within, reason); - case TYPE_ARRAY: - return this->array_type()->array_has_hidden_fields(within, reason); - default: - return false; - } -} - -// Return a hash code for the type to be used for method lookup. - -unsigned int -Type::hash_for_method(Gogo* gogo) const -{ - unsigned int ret = 0; - if (this->classification_ != TYPE_FORWARD) - ret += this->classification_; - return ret + this->do_hash_for_method(gogo); -} - -// Default implementation of do_hash_for_method. This is appropriate -// for types with no subfields. - -unsigned int -Type::do_hash_for_method(Gogo*) const -{ - return 0; -} - -// Return a hash code for a string, given a starting hash. - -unsigned int -Type::hash_string(const std::string& s, unsigned int h) -{ - const char* p = s.data(); - size_t len = s.length(); - for (; len > 0; --len) - { - h ^= *p++; - h*= 16777619; - } - return h; -} - -// A hash table mapping unnamed types to the backend representation of -// those types. - -Type::Type_btypes Type::type_btypes; - -// Return a tree representing this type. - -Btype* -Type::get_backend(Gogo* gogo) -{ - if (this->btype_ != NULL) - return this->btype_; - - if (this->forward_declaration_type() != NULL - || this->named_type() != NULL) - return this->get_btype_without_hash(gogo); - - if (this->is_error_type()) - return gogo->backend()->error_type(); - - // To avoid confusing the backend, translate all identical Go types - // to the same backend representation. We use a hash table to do - // that. There is no need to use the hash table for named types, as - // named types are only identical to themselves. - - std::pair<Type*, Type_btype_entry> val; - val.first = this; - val.second.btype = NULL; - val.second.is_placeholder = false; - std::pair<Type_btypes::iterator, bool> ins = - Type::type_btypes.insert(val); - if (!ins.second && ins.first->second.btype != NULL) - { - // Note that GOGO can be NULL here, but only when the GCC - // middle-end is asking for a frontend type. That will only - // happen for simple types, which should never require - // placeholders. - if (!ins.first->second.is_placeholder) - this->btype_ = ins.first->second.btype; - else if (gogo->named_types_are_converted()) - { - this->finish_backend(gogo, ins.first->second.btype); - ins.first->second.is_placeholder = false; - } - - return ins.first->second.btype; - } - - Btype* bt = this->get_btype_without_hash(gogo); - - if (ins.first->second.btype == NULL) - { - ins.first->second.btype = bt; - ins.first->second.is_placeholder = false; - } - else - { - // We have already created a backend representation for this - // type. This can happen when an unnamed type is defined using - // a named type which in turns uses an identical unnamed type. - // Use the tree we created earlier and ignore the one we just - // built. - if (this->btype_ == bt) - this->btype_ = ins.first->second.btype; - bt = ins.first->second.btype; - } - - return bt; -} - -// Return the backend representation for a type without looking in the -// hash table for identical types. This is used for named types, -// since a named type is never identical to any other type. - -Btype* -Type::get_btype_without_hash(Gogo* gogo) -{ - if (this->btype_ == NULL) - { - Btype* bt = this->do_get_backend(gogo); - - // For a recursive function or pointer type, we will temporarily - // return a circular pointer type during the recursion. We - // don't want to record that for a forwarding type, as it may - // confuse us later. - if (this->forward_declaration_type() != NULL - && gogo->backend()->is_circular_pointer_type(bt)) - return bt; - - if (gogo == NULL || !gogo->named_types_are_converted()) - return bt; - - this->btype_ = bt; - } - return this->btype_; -} - -// Get the backend representation of a type without forcing the -// creation of the backend representation of all supporting types. -// This will return a backend type that has the correct size but may -// be incomplete. E.g., a pointer will just be a placeholder pointer, -// and will not contain the final representation of the type to which -// it points. This is used while converting all named types to the -// backend representation, to avoid problems with indirect references -// to types which are not yet complete. When this is called, the -// sizes of all direct references (e.g., a struct field) should be -// known, but the sizes of indirect references (e.g., the type to -// which a pointer points) may not. - -Btype* -Type::get_backend_placeholder(Gogo* gogo) -{ - if (gogo->named_types_are_converted()) - return this->get_backend(gogo); - if (this->btype_ != NULL) - return this->btype_; - - Btype* bt; - switch (this->classification_) - { - case TYPE_ERROR: - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_STRING: - case TYPE_NIL: - // These are simple types that can just be created directly. - return this->get_backend(gogo); - - case TYPE_MAP: - case TYPE_CHANNEL: - // All maps and channels have the same backend representation. - return this->get_backend(gogo); - - case TYPE_NAMED: - case TYPE_FORWARD: - // Named types keep track of their own dependencies and manage - // their own placeholders. - return this->get_backend(gogo); - - case TYPE_INTERFACE: - if (this->interface_type()->is_empty()) - return Interface_type::get_backend_empty_interface_type(gogo); - break; - - default: - break; - } - - std::pair<Type*, Type_btype_entry> val; - val.first = this; - val.second.btype = NULL; - val.second.is_placeholder = false; - std::pair<Type_btypes::iterator, bool> ins = - Type::type_btypes.insert(val); - if (!ins.second && ins.first->second.btype != NULL) - return ins.first->second.btype; - - switch (this->classification_) - { - case TYPE_FUNCTION: - { - Location loc = this->function_type()->location(); - bt = gogo->backend()->placeholder_pointer_type("", loc, true); - } - break; - - case TYPE_POINTER: - { - Location loc = Linemap::unknown_location(); - bt = gogo->backend()->placeholder_pointer_type("", loc, false); - } - break; - - case TYPE_STRUCT: - // We don't have to make the struct itself be a placeholder. We - // are promised that we know the sizes of the struct fields. - // But we may have to use a placeholder for any particular - // struct field. - { - std::vector<Backend::Btyped_identifier> bfields; - get_backend_struct_fields(gogo, this->struct_type()->fields(), - true, &bfields); - bt = gogo->backend()->struct_type(bfields); - } - break; - - case TYPE_ARRAY: - if (this->is_slice_type()) - { - std::vector<Backend::Btyped_identifier> bfields; - get_backend_slice_fields(gogo, this->array_type(), true, &bfields); - bt = gogo->backend()->struct_type(bfields); - } - else - { - Btype* element = this->array_type()->get_backend_element(gogo, true); - Bexpression* len = this->array_type()->get_backend_length(gogo); - bt = gogo->backend()->array_type(element, len); - } - break; - - case TYPE_INTERFACE: - { - go_assert(!this->interface_type()->is_empty()); - std::vector<Backend::Btyped_identifier> bfields; - get_backend_interface_fields(gogo, this->interface_type(), true, - &bfields); - bt = gogo->backend()->struct_type(bfields); - } - break; - - case TYPE_SINK: - case TYPE_CALL_MULTIPLE_RESULT: - /* Note that various classifications were handled in the earlier - switch. */ - default: - go_unreachable(); - } - - if (ins.first->second.btype == NULL) - { - ins.first->second.btype = bt; - ins.first->second.is_placeholder = true; - } - else - { - // A placeholder for this type got created along the way. Use - // that one and ignore the one we just built. - bt = ins.first->second.btype; - } - - return bt; -} - -// Complete the backend representation. This is called for a type -// using a placeholder type. - -void -Type::finish_backend(Gogo* gogo, Btype *placeholder) -{ - switch (this->classification_) - { - case TYPE_ERROR: - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_STRING: - case TYPE_NIL: - go_unreachable(); - - case TYPE_FUNCTION: - { - Btype* bt = this->do_get_backend(gogo); - if (!gogo->backend()->set_placeholder_function_type(placeholder, bt)) - go_assert(saw_errors()); - } - break; - - case TYPE_POINTER: - { - Btype* bt = this->do_get_backend(gogo); - if (!gogo->backend()->set_placeholder_pointer_type(placeholder, bt)) - go_assert(saw_errors()); - } - break; - - case TYPE_STRUCT: - // The struct type itself is done, but we have to make sure that - // all the field types are converted. - this->struct_type()->finish_backend_fields(gogo); - break; - - case TYPE_ARRAY: - // The array type itself is done, but make sure the element type - // is converted. - this->array_type()->finish_backend_element(gogo); - break; - - case TYPE_MAP: - case TYPE_CHANNEL: - go_unreachable(); - - case TYPE_INTERFACE: - // The interface type itself is done, but make sure the method - // types are converted. - this->interface_type()->finish_backend_methods(gogo); - break; - - case TYPE_NAMED: - case TYPE_FORWARD: - go_unreachable(); - - case TYPE_SINK: - case TYPE_CALL_MULTIPLE_RESULT: - default: - go_unreachable(); - } - - this->btype_ = placeholder; -} - -// Return a pointer to the type descriptor for this type. - -tree -Type::type_descriptor_pointer(Gogo* gogo, Location location) -{ - Type* t = this->forwarded(); - if (t->named_type() != NULL && t->named_type()->is_alias()) - t = t->named_type()->real_type(); - if (t->type_descriptor_var_ == NULL) - { - t->make_type_descriptor_var(gogo); - go_assert(t->type_descriptor_var_ != NULL); - } - tree var_tree = var_to_tree(t->type_descriptor_var_); - if (var_tree == error_mark_node) - return error_mark_node; - return build_fold_addr_expr_loc(location.gcc_location(), var_tree); -} - -// A mapping from unnamed types to type descriptor variables. - -Type::Type_descriptor_vars Type::type_descriptor_vars; - -// Build the type descriptor for this type. - -void -Type::make_type_descriptor_var(Gogo* gogo) -{ - go_assert(this->type_descriptor_var_ == NULL); - - Named_type* nt = this->named_type(); - - // We can have multiple instances of unnamed types, but we only want - // to emit the type descriptor once. We use a hash table. This is - // not necessary for named types, as they are unique, and we store - // the type descriptor in the type itself. - Bvariable** phash = NULL; - if (nt == NULL) - { - Bvariable* bvnull = NULL; - std::pair<Type_descriptor_vars::iterator, bool> ins = - Type::type_descriptor_vars.insert(std::make_pair(this, bvnull)); - if (!ins.second) - { - // We've already build a type descriptor for this type. - this->type_descriptor_var_ = ins.first->second; - return; - } - phash = &ins.first->second; - } - - std::string var_name = this->type_descriptor_var_name(gogo, nt); - - // Build the contents of the type descriptor. - Expression* initializer = this->do_type_descriptor(gogo, NULL); - - Btype* initializer_btype = initializer->type()->get_backend(gogo); - - Location loc = nt == NULL ? Linemap::predeclared_location() : nt->location(); - - const Package* dummy; - if (this->type_descriptor_defined_elsewhere(nt, &dummy)) - { - this->type_descriptor_var_ = - gogo->backend()->immutable_struct_reference(var_name, - initializer_btype, - loc); - if (phash != NULL) - *phash = this->type_descriptor_var_; - return; - } - - // See if this type descriptor can appear in multiple packages. - bool is_common = false; - if (nt != NULL) - { - // We create the descriptor for a builtin type whenever we need - // it. - is_common = nt->is_builtin(); - } - else - { - // This is an unnamed type. The descriptor could be defined in - // any package where it is needed, and the linker will pick one - // descriptor to keep. - is_common = true; - } - - // We are going to build the type descriptor in this package. We - // must create the variable before we convert the initializer to the - // backend representation, because the initializer may refer to the - // type descriptor of this type. By setting type_descriptor_var_ we - // ensure that type_descriptor_pointer will work if called while - // converting INITIALIZER. - - this->type_descriptor_var_ = - gogo->backend()->immutable_struct(var_name, is_common, initializer_btype, - loc); - if (phash != NULL) - *phash = this->type_descriptor_var_; - - Translate_context context(gogo, NULL, NULL, NULL); - context.set_is_const(); - Bexpression* binitializer = tree_to_expr(initializer->get_tree(&context)); - - gogo->backend()->immutable_struct_set_init(this->type_descriptor_var_, - var_name, is_common, - initializer_btype, loc, - binitializer); -} - -// Return the name of the type descriptor variable. If NT is not -// NULL, use it to get the name. Otherwise this is an unnamed type. - -std::string -Type::type_descriptor_var_name(Gogo* gogo, Named_type* nt) -{ - if (nt == NULL) - return "__go_td_" + this->mangled_name(gogo); - - Named_object* no = nt->named_object(); - unsigned int index; - const Named_object* in_function = nt->in_function(&index); - std::string ret = "__go_tdn_"; - if (nt->is_builtin()) - go_assert(in_function == NULL); - else - { - const std::string& pkgpath(no->package() == NULL - ? gogo->pkgpath_symbol() - : no->package()->pkgpath_symbol()); - ret.append(pkgpath); - ret.append(1, '.'); - if (in_function != NULL) - { - ret.append(Gogo::unpack_hidden_name(in_function->name())); - ret.append(1, '.'); - if (index > 0) - { - char buf[30]; - snprintf(buf, sizeof buf, "%u", index); - ret.append(buf); - ret.append(1, '.'); - } - } - } - - // FIXME: This adds in pkgpath twice for hidden symbols, which is - // pointless. - const std::string& name(no->name()); - if (!Gogo::is_hidden_name(name)) - ret.append(name); - else - { - ret.append(1, '.'); - ret.append(Gogo::pkgpath_for_symbol(Gogo::hidden_name_pkgpath(name))); - ret.append(1, '.'); - ret.append(Gogo::unpack_hidden_name(name)); - } - - return ret; -} - -// Return true if this type descriptor is defined in a different -// package. If this returns true it sets *PACKAGE to the package. - -bool -Type::type_descriptor_defined_elsewhere(Named_type* nt, - const Package** package) -{ - if (nt != NULL) - { - if (nt->named_object()->package() != NULL) - { - // This is a named type defined in a different package. The - // type descriptor should be defined in that package. - *package = nt->named_object()->package(); - return true; - } - } - else - { - if (this->points_to() != NULL - && this->points_to()->named_type() != NULL - && this->points_to()->named_type()->named_object()->package() != NULL) - { - // This is an unnamed pointer to a named type defined in a - // different package. The descriptor should be defined in - // that package. - *package = this->points_to()->named_type()->named_object()->package(); - return true; - } - } - return false; -} - -// Return a composite literal for a type descriptor. - -Expression* -Type::type_descriptor(Gogo* gogo, Type* type) -{ - return type->do_type_descriptor(gogo, NULL); -} - -// Return a composite literal for a type descriptor with a name. - -Expression* -Type::named_type_descriptor(Gogo* gogo, Type* type, Named_type* name) -{ - go_assert(name != NULL && type->named_type() != name); - return type->do_type_descriptor(gogo, name); -} - -// Make a builtin struct type from a list of fields. The fields are -// pairs of a name and a type. - -Struct_type* -Type::make_builtin_struct_type(int nfields, ...) -{ - va_list ap; - va_start(ap, nfields); - - Location bloc = Linemap::predeclared_location(); - Struct_field_list* sfl = new Struct_field_list(); - for (int i = 0; i < nfields; i++) - { - const char* field_name = va_arg(ap, const char *); - Type* type = va_arg(ap, Type*); - sfl->push_back(Struct_field(Typed_identifier(field_name, type, bloc))); - } - - va_end(ap); - - return Type::make_struct_type(sfl, bloc); -} - -// A list of builtin named types. - -std::vector<Named_type*> Type::named_builtin_types; - -// Make a builtin named type. - -Named_type* -Type::make_builtin_named_type(const char* name, Type* type) -{ - Location bloc = Linemap::predeclared_location(); - Named_object* no = Named_object::make_type(name, NULL, type, bloc); - Named_type* ret = no->type_value(); - Type::named_builtin_types.push_back(ret); - return ret; -} - -// Convert the named builtin types. - -void -Type::convert_builtin_named_types(Gogo* gogo) -{ - for (std::vector<Named_type*>::const_iterator p = - Type::named_builtin_types.begin(); - p != Type::named_builtin_types.end(); - ++p) - { - bool r = (*p)->verify(); - go_assert(r); - (*p)->convert(gogo); - } -} - -// Return the type of a type descriptor. We should really tie this to -// runtime.Type rather than copying it. This must match commonType in -// libgo/go/runtime/type.go. - -Type* -Type::make_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Location bloc = Linemap::predeclared_location(); - - Type* uint8_type = Type::lookup_integer_type("uint8"); - Type* uint32_type = Type::lookup_integer_type("uint32"); - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - Type* string_type = Type::lookup_string_type(); - Type* pointer_string_type = Type::make_pointer_type(string_type); - - // This is an unnamed version of unsafe.Pointer. Perhaps we - // should use the named version instead, although that would - // require us to create the unsafe package if it has not been - // imported. It probably doesn't matter. - Type* void_type = Type::make_void_type(); - Type* unsafe_pointer_type = Type::make_pointer_type(void_type); - - // Forward declaration for the type descriptor type. - Named_object* named_type_descriptor_type = - Named_object::make_type_declaration("commonType", NULL, bloc); - Type* ft = Type::make_forward_declaration(named_type_descriptor_type); - Type* pointer_type_descriptor_type = Type::make_pointer_type(ft); - - // The type of a method on a concrete type. - Struct_type* method_type = - Type::make_builtin_struct_type(5, - "name", pointer_string_type, - "pkgPath", pointer_string_type, - "mtyp", pointer_type_descriptor_type, - "typ", pointer_type_descriptor_type, - "tfn", unsafe_pointer_type); - Named_type* named_method_type = - Type::make_builtin_named_type("method", method_type); - - // Information for types with a name or methods. - Type* slice_named_method_type = - Type::make_array_type(named_method_type, NULL); - Struct_type* uncommon_type = - Type::make_builtin_struct_type(3, - "name", pointer_string_type, - "pkgPath", pointer_string_type, - "methods", slice_named_method_type); - Named_type* named_uncommon_type = - Type::make_builtin_named_type("uncommonType", uncommon_type); - - Type* pointer_uncommon_type = - Type::make_pointer_type(named_uncommon_type); - - // The type descriptor type. - - Typed_identifier_list* params = new Typed_identifier_list(); - params->push_back(Typed_identifier("key", unsafe_pointer_type, bloc)); - params->push_back(Typed_identifier("key_size", uintptr_type, bloc)); - - Typed_identifier_list* results = new Typed_identifier_list(); - results->push_back(Typed_identifier("", uintptr_type, bloc)); - - Type* hashfn_type = Type::make_function_type(NULL, params, results, bloc); - - params = new Typed_identifier_list(); - params->push_back(Typed_identifier("key1", unsafe_pointer_type, bloc)); - params->push_back(Typed_identifier("key2", unsafe_pointer_type, bloc)); - params->push_back(Typed_identifier("key_size", uintptr_type, bloc)); - - results = new Typed_identifier_list(); - results->push_back(Typed_identifier("", Type::lookup_bool_type(), bloc)); - - Type* equalfn_type = Type::make_function_type(NULL, params, results, - bloc); - - Struct_type* type_descriptor_type = - Type::make_builtin_struct_type(10, - "Kind", uint8_type, - "align", uint8_type, - "fieldAlign", uint8_type, - "size", uintptr_type, - "hash", uint32_type, - "hashfn", hashfn_type, - "equalfn", equalfn_type, - "string", pointer_string_type, - "", pointer_uncommon_type, - "ptrToThis", - pointer_type_descriptor_type); - - Named_type* named = Type::make_builtin_named_type("commonType", - type_descriptor_type); - - named_type_descriptor_type->set_type_value(named); - - ret = named; - } - - return ret; -} - -// Make the type of a pointer to a type descriptor as represented in -// Go. - -Type* -Type::make_type_descriptor_ptr_type() -{ - static Type* ret; - if (ret == NULL) - ret = Type::make_pointer_type(Type::make_type_descriptor_type()); - return ret; -} - -// Set *HASH_FN and *EQUAL_FN to the runtime functions which compute a -// hash code for this type and which compare whether two values of -// this type are equal. If NAME is not NULL it is the name of this -// type. HASH_FNTYPE and EQUAL_FNTYPE are the types of these -// functions, for convenience; they may be NULL. - -void -Type::type_functions(Gogo* gogo, Named_type* name, Function_type* hash_fntype, - Function_type* equal_fntype, Named_object** hash_fn, - Named_object** equal_fn) -{ - if (hash_fntype == NULL || equal_fntype == NULL) - { - Location bloc = Linemap::predeclared_location(); - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - Type* void_type = Type::make_void_type(); - Type* unsafe_pointer_type = Type::make_pointer_type(void_type); - - if (hash_fntype == NULL) - { - Typed_identifier_list* params = new Typed_identifier_list(); - params->push_back(Typed_identifier("key", unsafe_pointer_type, - bloc)); - params->push_back(Typed_identifier("key_size", uintptr_type, bloc)); - - Typed_identifier_list* results = new Typed_identifier_list(); - results->push_back(Typed_identifier("", uintptr_type, bloc)); - - hash_fntype = Type::make_function_type(NULL, params, results, bloc); - } - if (equal_fntype == NULL) - { - Typed_identifier_list* params = new Typed_identifier_list(); - params->push_back(Typed_identifier("key1", unsafe_pointer_type, - bloc)); - params->push_back(Typed_identifier("key2", unsafe_pointer_type, - bloc)); - params->push_back(Typed_identifier("key_size", uintptr_type, bloc)); - - Typed_identifier_list* results = new Typed_identifier_list(); - results->push_back(Typed_identifier("", Type::lookup_bool_type(), - bloc)); - - equal_fntype = Type::make_function_type(NULL, params, results, bloc); - } - } - - const char* hash_fnname; - const char* equal_fnname; - if (this->compare_is_identity(gogo)) - { - hash_fnname = "__go_type_hash_identity"; - equal_fnname = "__go_type_equal_identity"; - } - else if (!this->is_comparable()) - { - hash_fnname = "__go_type_hash_error"; - equal_fnname = "__go_type_equal_error"; - } - else - { - switch (this->base()->classification()) - { - case Type::TYPE_ERROR: - case Type::TYPE_VOID: - case Type::TYPE_NIL: - case Type::TYPE_FUNCTION: - case Type::TYPE_MAP: - // For these types is_comparable should have returned false. - go_unreachable(); - - case Type::TYPE_BOOLEAN: - case Type::TYPE_INTEGER: - case Type::TYPE_POINTER: - case Type::TYPE_CHANNEL: - // For these types compare_is_identity should have returned true. - go_unreachable(); - - case Type::TYPE_FLOAT: - hash_fnname = "__go_type_hash_float"; - equal_fnname = "__go_type_equal_float"; - break; - - case Type::TYPE_COMPLEX: - hash_fnname = "__go_type_hash_complex"; - equal_fnname = "__go_type_equal_complex"; - break; - - case Type::TYPE_STRING: - hash_fnname = "__go_type_hash_string"; - equal_fnname = "__go_type_equal_string"; - break; - - case Type::TYPE_STRUCT: - { - // This is a struct which can not be compared using a - // simple identity function. We need to build a function - // for comparison. - this->specific_type_functions(gogo, name, hash_fntype, - equal_fntype, hash_fn, equal_fn); - return; - } - - case Type::TYPE_ARRAY: - if (this->is_slice_type()) - { - // Type::is_compatible_for_comparison should have - // returned false. - go_unreachable(); - } - else - { - // This is an array which can not be compared using a - // simple identity function. We need to build a - // function for comparison. - this->specific_type_functions(gogo, name, hash_fntype, - equal_fntype, hash_fn, equal_fn); - return; - } - break; - - case Type::TYPE_INTERFACE: - if (this->interface_type()->is_empty()) - { - hash_fnname = "__go_type_hash_empty_interface"; - equal_fnname = "__go_type_equal_empty_interface"; - } - else - { - hash_fnname = "__go_type_hash_interface"; - equal_fnname = "__go_type_equal_interface"; - } - break; - - case Type::TYPE_NAMED: - case Type::TYPE_FORWARD: - go_unreachable(); - - default: - go_unreachable(); - } - } - - - Location bloc = Linemap::predeclared_location(); - *hash_fn = Named_object::make_function_declaration(hash_fnname, NULL, - hash_fntype, bloc); - (*hash_fn)->func_declaration_value()->set_asm_name(hash_fnname); - *equal_fn = Named_object::make_function_declaration(equal_fnname, NULL, - equal_fntype, bloc); - (*equal_fn)->func_declaration_value()->set_asm_name(equal_fnname); -} - -// A hash table mapping types to the specific hash functions. - -Type::Type_functions Type::type_functions_table; - -// Handle a type function which is specific to a type: a struct or -// array which can not use an identity comparison. - -void -Type::specific_type_functions(Gogo* gogo, Named_type* name, - Function_type* hash_fntype, - Function_type* equal_fntype, - Named_object** hash_fn, - Named_object** equal_fn) -{ - Hash_equal_fn fnull(NULL, NULL); - std::pair<Type*, Hash_equal_fn> val(name != NULL ? name : this, fnull); - std::pair<Type_functions::iterator, bool> ins = - Type::type_functions_table.insert(val); - if (!ins.second) - { - // We already have functions for this type - *hash_fn = ins.first->second.first; - *equal_fn = ins.first->second.second; - return; - } - - std::string base_name; - if (name == NULL) - { - // Mangled names can have '.' if they happen to refer to named - // types in some way. That's fine if this is simply a named - // type, but otherwise it will confuse the code that builds - // function identifiers. Remove '.' when necessary. - base_name = this->mangled_name(gogo); - size_t i; - while ((i = base_name.find('.')) != std::string::npos) - base_name[i] = '$'; - base_name = gogo->pack_hidden_name(base_name, false); - } - else - { - // This name is already hidden or not as appropriate. - base_name = name->name(); - unsigned int index; - const Named_object* in_function = name->in_function(&index); - if (in_function != NULL) - { - base_name += '$' + Gogo::unpack_hidden_name(in_function->name()); - if (index > 0) - { - char buf[30]; - snprintf(buf, sizeof buf, "%u", index); - base_name += '$'; - base_name += buf; - } - } - } - std::string hash_name = base_name + "$hash"; - std::string equal_name = base_name + "$equal"; - - Location bloc = Linemap::predeclared_location(); - - const Package* package = NULL; - bool is_defined_elsewhere = - this->type_descriptor_defined_elsewhere(name, &package); - if (is_defined_elsewhere) - { - *hash_fn = Named_object::make_function_declaration(hash_name, package, - hash_fntype, bloc); - *equal_fn = Named_object::make_function_declaration(equal_name, package, - equal_fntype, bloc); - } - else - { - *hash_fn = gogo->declare_package_function(hash_name, hash_fntype, bloc); - *equal_fn = gogo->declare_package_function(equal_name, equal_fntype, - bloc); - } - - ins.first->second.first = *hash_fn; - ins.first->second.second = *equal_fn; - - if (!is_defined_elsewhere) - { - if (gogo->in_global_scope()) - this->write_specific_type_functions(gogo, name, hash_name, hash_fntype, - equal_name, equal_fntype); - else - gogo->queue_specific_type_function(this, name, hash_name, hash_fntype, - equal_name, equal_fntype); - } -} - -// Write the hash and equality functions for a type which needs to be -// written specially. - -void -Type::write_specific_type_functions(Gogo* gogo, Named_type* name, - const std::string& hash_name, - Function_type* hash_fntype, - const std::string& equal_name, - Function_type* equal_fntype) -{ - Location bloc = Linemap::predeclared_location(); - - if (gogo->specific_type_functions_are_written()) - { - go_assert(saw_errors()); - return; - } - - Named_object* hash_fn = gogo->start_function(hash_name, hash_fntype, false, - bloc); - gogo->start_block(bloc); - - if (this->struct_type() != NULL) - this->struct_type()->write_hash_function(gogo, name, hash_fntype, - equal_fntype); - else if (this->array_type() != NULL) - this->array_type()->write_hash_function(gogo, name, hash_fntype, - equal_fntype); - else - go_unreachable(); - - Block* b = gogo->finish_block(bloc); - gogo->add_block(b, bloc); - gogo->lower_block(hash_fn, b); - gogo->finish_function(bloc); - - Named_object *equal_fn = gogo->start_function(equal_name, equal_fntype, - false, bloc); - gogo->start_block(bloc); - - if (this->struct_type() != NULL) - this->struct_type()->write_equal_function(gogo, name); - else if (this->array_type() != NULL) - this->array_type()->write_equal_function(gogo, name); - else - go_unreachable(); - - b = gogo->finish_block(bloc); - gogo->add_block(b, bloc); - gogo->lower_block(equal_fn, b); - gogo->finish_function(bloc); -} - -// Return a composite literal for the type descriptor for a plain type -// of kind RUNTIME_TYPE_KIND named NAME. - -Expression* -Type::type_descriptor_constructor(Gogo* gogo, int runtime_type_kind, - Named_type* name, const Methods* methods, - bool only_value_methods) -{ - Location bloc = Linemap::predeclared_location(); - - Type* td_type = Type::make_type_descriptor_type(); - const Struct_field_list* fields = td_type->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(9); - - if (!this->has_pointer()) - runtime_type_kind |= RUNTIME_TYPE_KIND_NO_POINTERS; - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("Kind")); - mpz_t iv; - mpz_init_set_ui(iv, runtime_type_kind); - vals->push_back(Expression::make_integer(&iv, p->type(), bloc)); - - ++p; - go_assert(p->is_field_name("align")); - Expression::Type_info type_info = Expression::TYPE_INFO_ALIGNMENT; - vals->push_back(Expression::make_type_info(this, type_info)); - - ++p; - go_assert(p->is_field_name("fieldAlign")); - type_info = Expression::TYPE_INFO_FIELD_ALIGNMENT; - vals->push_back(Expression::make_type_info(this, type_info)); - - ++p; - go_assert(p->is_field_name("size")); - type_info = Expression::TYPE_INFO_SIZE; - vals->push_back(Expression::make_type_info(this, type_info)); - - ++p; - go_assert(p->is_field_name("hash")); - unsigned int h; - if (name != NULL) - h = name->hash_for_method(gogo); - else - h = this->hash_for_method(gogo); - mpz_set_ui(iv, h); - vals->push_back(Expression::make_integer(&iv, p->type(), bloc)); - - ++p; - go_assert(p->is_field_name("hashfn")); - Function_type* hash_fntype = p->type()->function_type(); - - ++p; - go_assert(p->is_field_name("equalfn")); - Function_type* equal_fntype = p->type()->function_type(); - - Named_object* hash_fn; - Named_object* equal_fn; - this->type_functions(gogo, name, hash_fntype, equal_fntype, &hash_fn, - &equal_fn); - vals->push_back(Expression::make_func_reference(hash_fn, NULL, bloc)); - vals->push_back(Expression::make_func_reference(equal_fn, NULL, bloc)); - - ++p; - go_assert(p->is_field_name("string")); - Expression* s = Expression::make_string((name != NULL - ? name->reflection(gogo) - : this->reflection(gogo)), - bloc); - vals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - - ++p; - go_assert(p->is_field_name("uncommonType")); - if (name == NULL && methods == NULL) - vals->push_back(Expression::make_nil(bloc)); - else - { - if (methods == NULL) - methods = name->methods(); - vals->push_back(this->uncommon_type_constructor(gogo, - p->type()->deref(), - name, methods, - only_value_methods)); - } - - ++p; - go_assert(p->is_field_name("ptrToThis")); - if (name == NULL) - vals->push_back(Expression::make_nil(bloc)); - else - { - Type* pt = Type::make_pointer_type(name); - vals->push_back(Expression::make_type_descriptor(pt, bloc)); - } - - ++p; - go_assert(p == fields->end()); - - mpz_clear(iv); - - return Expression::make_struct_composite_literal(td_type, vals, bloc); -} - -// Return a composite literal for the uncommon type information for -// this type. UNCOMMON_STRUCT_TYPE is the type of the uncommon type -// struct. If name is not NULL, it is the name of the type. If -// METHODS is not NULL, it is the list of methods. ONLY_VALUE_METHODS -// is true if only value methods should be included. At least one of -// NAME and METHODS must not be NULL. - -Expression* -Type::uncommon_type_constructor(Gogo* gogo, Type* uncommon_type, - Named_type* name, const Methods* methods, - bool only_value_methods) const -{ - Location bloc = Linemap::predeclared_location(); - - const Struct_field_list* fields = uncommon_type->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(3); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("name")); - - ++p; - go_assert(p->is_field_name("pkgPath")); - - if (name == NULL) - { - vals->push_back(Expression::make_nil(bloc)); - vals->push_back(Expression::make_nil(bloc)); - } - else - { - Named_object* no = name->named_object(); - std::string n = Gogo::unpack_hidden_name(no->name()); - Expression* s = Expression::make_string(n, bloc); - vals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - - if (name->is_builtin()) - vals->push_back(Expression::make_nil(bloc)); - else - { - const Package* package = no->package(); - const std::string& pkgpath(package == NULL - ? gogo->pkgpath() - : package->pkgpath()); - n.assign(pkgpath); - unsigned int index; - const Named_object* in_function = name->in_function(&index); - if (in_function != NULL) - { - n.append(1, '.'); - n.append(Gogo::unpack_hidden_name(in_function->name())); - if (index > 0) - { - char buf[30]; - snprintf(buf, sizeof buf, "%u", index); - n.append(1, '.'); - n.append(buf); - } - } - s = Expression::make_string(n, bloc); - vals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - } - } - - ++p; - go_assert(p->is_field_name("methods")); - vals->push_back(this->methods_constructor(gogo, p->type(), methods, - only_value_methods)); - - ++p; - go_assert(p == fields->end()); - - Expression* r = Expression::make_struct_composite_literal(uncommon_type, - vals, bloc); - return Expression::make_unary(OPERATOR_AND, r, bloc); -} - -// Sort methods by name. - -class Sort_methods -{ - public: - bool - operator()(const std::pair<std::string, const Method*>& m1, - const std::pair<std::string, const Method*>& m2) const - { return m1.first < m2.first; } -}; - -// Return a composite literal for the type method table for this type. -// METHODS_TYPE is the type of the table, and is a slice type. -// METHODS is the list of methods. If ONLY_VALUE_METHODS is true, -// then only value methods are used. - -Expression* -Type::methods_constructor(Gogo* gogo, Type* methods_type, - const Methods* methods, - bool only_value_methods) const -{ - Location bloc = Linemap::predeclared_location(); - - std::vector<std::pair<std::string, const Method*> > smethods; - if (methods != NULL) - { - smethods.reserve(methods->count()); - for (Methods::const_iterator p = methods->begin(); - p != methods->end(); - ++p) - { - if (p->second->is_ambiguous()) - continue; - if (only_value_methods && !p->second->is_value_method()) - continue; - - // This is where we implement the magic //go:nointerface - // comment. If we saw that comment, we don't add this - // method to the type descriptor. - if (p->second->nointerface()) - continue; - - smethods.push_back(std::make_pair(p->first, p->second)); - } - } - - if (smethods.empty()) - return Expression::make_slice_composite_literal(methods_type, NULL, bloc); - - std::sort(smethods.begin(), smethods.end(), Sort_methods()); - - Type* method_type = methods_type->array_type()->element_type(); - - Expression_list* vals = new Expression_list(); - vals->reserve(smethods.size()); - for (std::vector<std::pair<std::string, const Method*> >::const_iterator p - = smethods.begin(); - p != smethods.end(); - ++p) - vals->push_back(this->method_constructor(gogo, method_type, p->first, - p->second, only_value_methods)); - - return Expression::make_slice_composite_literal(methods_type, vals, bloc); -} - -// Return a composite literal for a single method. METHOD_TYPE is the -// type of the entry. METHOD_NAME is the name of the method and M is -// the method information. - -Expression* -Type::method_constructor(Gogo*, Type* method_type, - const std::string& method_name, - const Method* m, - bool only_value_methods) const -{ - Location bloc = Linemap::predeclared_location(); - - const Struct_field_list* fields = method_type->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(5); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("name")); - const std::string n = Gogo::unpack_hidden_name(method_name); - Expression* s = Expression::make_string(n, bloc); - vals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - - ++p; - go_assert(p->is_field_name("pkgPath")); - if (!Gogo::is_hidden_name(method_name)) - vals->push_back(Expression::make_nil(bloc)); - else - { - s = Expression::make_string(Gogo::hidden_name_pkgpath(method_name), - bloc); - vals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - } - - Named_object* no = (m->needs_stub_method() - ? m->stub_object() - : m->named_object()); - - Function_type* mtype; - if (no->is_function()) - mtype = no->func_value()->type(); - else - mtype = no->func_declaration_value()->type(); - go_assert(mtype->is_method()); - Type* nonmethod_type = mtype->copy_without_receiver(); - - ++p; - go_assert(p->is_field_name("mtyp")); - vals->push_back(Expression::make_type_descriptor(nonmethod_type, bloc)); - - ++p; - go_assert(p->is_field_name("typ")); - if (!only_value_methods && m->is_value_method()) - { - // This is a value method on a pointer type. Change the type of - // the method to use a pointer receiver. The implementation - // always uses a pointer receiver anyhow. - Type* rtype = mtype->receiver()->type(); - Type* prtype = Type::make_pointer_type(rtype); - Typed_identifier* receiver = - new Typed_identifier(mtype->receiver()->name(), prtype, - mtype->receiver()->location()); - mtype = Type::make_function_type(receiver, - (mtype->parameters() == NULL - ? NULL - : mtype->parameters()->copy()), - (mtype->results() == NULL - ? NULL - : mtype->results()->copy()), - mtype->location()); - } - vals->push_back(Expression::make_type_descriptor(mtype, bloc)); - - ++p; - go_assert(p->is_field_name("tfn")); - vals->push_back(Expression::make_func_reference(no, NULL, bloc)); - - ++p; - go_assert(p == fields->end()); - - return Expression::make_struct_composite_literal(method_type, vals, bloc); -} - -// Return a composite literal for the type descriptor of a plain type. -// RUNTIME_TYPE_KIND is the value of the kind field. If NAME is not -// NULL, it is the name to use as well as the list of methods. - -Expression* -Type::plain_type_descriptor(Gogo* gogo, int runtime_type_kind, - Named_type* name) -{ - return this->type_descriptor_constructor(gogo, runtime_type_kind, - name, NULL, true); -} - -// Return the type reflection string for this type. - -std::string -Type::reflection(Gogo* gogo) const -{ - std::string ret; - - // The do_reflection virtual function should set RET to the - // reflection string. - this->do_reflection(gogo, &ret); - - return ret; -} - -// Return a mangled name for the type. - -std::string -Type::mangled_name(Gogo* gogo) const -{ - std::string ret; - - // The do_mangled_name virtual function should set RET to the - // mangled name. For a composite type it should append a code for - // the composition and then call do_mangled_name on the components. - this->do_mangled_name(gogo, &ret); - - return ret; -} - -// Return whether the backend size of the type is known. - -bool -Type::is_backend_type_size_known(Gogo* gogo) -{ - switch (this->classification_) - { - case TYPE_ERROR: - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_STRING: - case TYPE_FUNCTION: - case TYPE_POINTER: - case TYPE_NIL: - case TYPE_MAP: - case TYPE_CHANNEL: - case TYPE_INTERFACE: - return true; - - case TYPE_STRUCT: - { - const Struct_field_list* fields = this->struct_type()->fields(); - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - if (!pf->type()->is_backend_type_size_known(gogo)) - return false; - return true; - } - - case TYPE_ARRAY: - { - const Array_type* at = this->array_type(); - if (at->length() == NULL) - return true; - else - { - Numeric_constant nc; - if (!at->length()->numeric_constant_value(&nc)) - return false; - mpz_t ival; - if (!nc.to_int(&ival)) - return false; - mpz_clear(ival); - return at->element_type()->is_backend_type_size_known(gogo); - } - } - - case TYPE_NAMED: - // Begin converting this type to the backend representation. - // This will create a placeholder if necessary. - this->get_backend(gogo); - return this->named_type()->is_named_backend_type_size_known(); - - case TYPE_FORWARD: - { - Forward_declaration_type* fdt = this->forward_declaration_type(); - return fdt->real_type()->is_backend_type_size_known(gogo); - } - - case TYPE_SINK: - case TYPE_CALL_MULTIPLE_RESULT: - go_unreachable(); - - default: - go_unreachable(); - } -} - -// If the size of the type can be determined, set *PSIZE to the size -// in bytes and return true. Otherwise, return false. This queries -// the backend. - -bool -Type::backend_type_size(Gogo* gogo, unsigned int *psize) -{ - if (!this->is_backend_type_size_known(gogo)) - return false; - Btype* bt = this->get_backend_placeholder(gogo); - size_t size = gogo->backend()->type_size(bt); - *psize = static_cast<unsigned int>(size); - if (*psize != size) - return false; - return true; -} - -// If the alignment of the type can be determined, set *PALIGN to -// the alignment in bytes and return true. Otherwise, return false. - -bool -Type::backend_type_align(Gogo* gogo, unsigned int *palign) -{ - if (!this->is_backend_type_size_known(gogo)) - return false; - Btype* bt = this->get_backend_placeholder(gogo); - size_t align = gogo->backend()->type_alignment(bt); - *palign = static_cast<unsigned int>(align); - if (*palign != align) - return false; - return true; -} - -// Like backend_type_align, but return the alignment when used as a -// field. - -bool -Type::backend_type_field_align(Gogo* gogo, unsigned int *palign) -{ - if (!this->is_backend_type_size_known(gogo)) - return false; - Btype* bt = this->get_backend_placeholder(gogo); - size_t a = gogo->backend()->type_field_alignment(bt); - *palign = static_cast<unsigned int>(a); - if (*palign != a) - return false; - return true; -} - -// Default function to export a type. - -void -Type::do_export(Export*) const -{ - go_unreachable(); -} - -// Import a type. - -Type* -Type::import_type(Import* imp) -{ - if (imp->match_c_string("(")) - return Function_type::do_import(imp); - else if (imp->match_c_string("*")) - return Pointer_type::do_import(imp); - else if (imp->match_c_string("struct ")) - return Struct_type::do_import(imp); - else if (imp->match_c_string("[")) - return Array_type::do_import(imp); - else if (imp->match_c_string("map ")) - return Map_type::do_import(imp); - else if (imp->match_c_string("chan ")) - return Channel_type::do_import(imp); - else if (imp->match_c_string("interface")) - return Interface_type::do_import(imp); - else - { - error_at(imp->location(), "import error: expected type"); - return Type::make_error_type(); - } -} - -// A type used to indicate a parsing error. This exists to simplify -// later error detection. - -class Error_type : public Type -{ - public: - Error_type() - : Type(TYPE_ERROR) - { } - - protected: - bool - do_compare_is_identity(Gogo*) - { return false; } - - Btype* - do_get_backend(Gogo* gogo) - { return gogo->backend()->error_type(); } - - Expression* - do_type_descriptor(Gogo*, Named_type*) - { return Expression::make_error(Linemap::predeclared_location()); } - - void - do_reflection(Gogo*, std::string*) const - { go_assert(saw_errors()); } - - void - do_mangled_name(Gogo*, std::string* ret) const - { ret->push_back('E'); } -}; - -Type* -Type::make_error_type() -{ - static Error_type singleton_error_type; - return &singleton_error_type; -} - -// The void type. - -class Void_type : public Type -{ - public: - Void_type() - : Type(TYPE_VOID) - { } - - protected: - bool - do_compare_is_identity(Gogo*) - { return false; } - - Btype* - do_get_backend(Gogo* gogo) - { return gogo->backend()->void_type(); } - - Expression* - do_type_descriptor(Gogo*, Named_type*) - { go_unreachable(); } - - void - do_reflection(Gogo*, std::string*) const - { } - - void - do_mangled_name(Gogo*, std::string* ret) const - { ret->push_back('v'); } -}; - -Type* -Type::make_void_type() -{ - static Void_type singleton_void_type; - return &singleton_void_type; -} - -// The boolean type. - -class Boolean_type : public Type -{ - public: - Boolean_type() - : Type(TYPE_BOOLEAN) - { } - - protected: - bool - do_compare_is_identity(Gogo*) - { return true; } - - Btype* - do_get_backend(Gogo* gogo) - { return gogo->backend()->bool_type(); } - - Expression* - do_type_descriptor(Gogo*, Named_type* name); - - // We should not be asked for the reflection string of a basic type. - void - do_reflection(Gogo*, std::string* ret) const - { ret->append("bool"); } - - void - do_mangled_name(Gogo*, std::string* ret) const - { ret->push_back('b'); } -}; - -// Make the type descriptor. - -Expression* -Boolean_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - if (name != NULL) - return this->plain_type_descriptor(gogo, RUNTIME_TYPE_KIND_BOOL, name); - else - { - Named_object* no = gogo->lookup_global("bool"); - go_assert(no != NULL); - return Type::type_descriptor(gogo, no->type_value()); - } -} - -Type* -Type::make_boolean_type() -{ - static Boolean_type boolean_type; - return &boolean_type; -} - -// The named type "bool". - -static Named_type* named_bool_type; - -// Get the named type "bool". - -Named_type* -Type::lookup_bool_type() -{ - return named_bool_type; -} - -// Make the named type "bool". - -Named_type* -Type::make_named_bool_type() -{ - Type* bool_type = Type::make_boolean_type(); - Named_object* named_object = - Named_object::make_type("bool", NULL, bool_type, - Linemap::predeclared_location()); - Named_type* named_type = named_object->type_value(); - named_bool_type = named_type; - return named_type; -} - -// Class Integer_type. - -Integer_type::Named_integer_types Integer_type::named_integer_types; - -// Create a new integer type. Non-abstract integer types always have -// names. - -Named_type* -Integer_type::create_integer_type(const char* name, bool is_unsigned, - int bits, int runtime_type_kind) -{ - Integer_type* integer_type = new Integer_type(false, is_unsigned, bits, - runtime_type_kind); - std::string sname(name); - Named_object* named_object = - Named_object::make_type(sname, NULL, integer_type, - Linemap::predeclared_location()); - Named_type* named_type = named_object->type_value(); - std::pair<Named_integer_types::iterator, bool> ins = - Integer_type::named_integer_types.insert(std::make_pair(sname, named_type)); - go_assert(ins.second); - return named_type; -} - -// Look up an existing integer type. - -Named_type* -Integer_type::lookup_integer_type(const char* name) -{ - Named_integer_types::const_iterator p = - Integer_type::named_integer_types.find(name); - go_assert(p != Integer_type::named_integer_types.end()); - return p->second; -} - -// Create a new abstract integer type. - -Integer_type* -Integer_type::create_abstract_integer_type() -{ - static Integer_type* abstract_type; - if (abstract_type == NULL) - { - Type* int_type = Type::lookup_integer_type("int"); - abstract_type = new Integer_type(true, false, - int_type->integer_type()->bits(), - RUNTIME_TYPE_KIND_INT); - } - return abstract_type; -} - -// Create a new abstract character type. - -Integer_type* -Integer_type::create_abstract_character_type() -{ - static Integer_type* abstract_type; - if (abstract_type == NULL) - { - abstract_type = new Integer_type(true, false, 32, - RUNTIME_TYPE_KIND_INT32); - abstract_type->set_is_rune(); - } - return abstract_type; -} - -// Integer type compatibility. - -bool -Integer_type::is_identical(const Integer_type* t) const -{ - if (this->is_unsigned_ != t->is_unsigned_ || this->bits_ != t->bits_) - return false; - return this->is_abstract_ == t->is_abstract_; -} - -// Hash code. - -unsigned int -Integer_type::do_hash_for_method(Gogo*) const -{ - return ((this->bits_ << 4) - + ((this->is_unsigned_ ? 1 : 0) << 8) - + ((this->is_abstract_ ? 1 : 0) << 9)); -} - -// Convert an Integer_type to the backend representation. - -Btype* -Integer_type::do_get_backend(Gogo* gogo) -{ - if (this->is_abstract_) - { - go_assert(saw_errors()); - return gogo->backend()->error_type(); - } - return gogo->backend()->integer_type(this->is_unsigned_, this->bits_); -} - -// The type descriptor for an integer type. Integer types are always -// named. - -Expression* -Integer_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - go_assert(name != NULL || saw_errors()); - return this->plain_type_descriptor(gogo, this->runtime_type_kind_, name); -} - -// We should not be asked for the reflection string of a basic type. - -void -Integer_type::do_reflection(Gogo*, std::string*) const -{ - go_assert(saw_errors()); -} - -// Mangled name. - -void -Integer_type::do_mangled_name(Gogo*, std::string* ret) const -{ - char buf[100]; - snprintf(buf, sizeof buf, "i%s%s%de", - this->is_abstract_ ? "a" : "", - this->is_unsigned_ ? "u" : "", - this->bits_); - ret->append(buf); -} - -// Make an integer type. - -Named_type* -Type::make_integer_type(const char* name, bool is_unsigned, int bits, - int runtime_type_kind) -{ - return Integer_type::create_integer_type(name, is_unsigned, bits, - runtime_type_kind); -} - -// Make an abstract integer type. - -Integer_type* -Type::make_abstract_integer_type() -{ - return Integer_type::create_abstract_integer_type(); -} - -// Make an abstract character type. - -Integer_type* -Type::make_abstract_character_type() -{ - return Integer_type::create_abstract_character_type(); -} - -// Look up an integer type. - -Named_type* -Type::lookup_integer_type(const char* name) -{ - return Integer_type::lookup_integer_type(name); -} - -// Class Float_type. - -Float_type::Named_float_types Float_type::named_float_types; - -// Create a new float type. Non-abstract float types always have -// names. - -Named_type* -Float_type::create_float_type(const char* name, int bits, - int runtime_type_kind) -{ - Float_type* float_type = new Float_type(false, bits, runtime_type_kind); - std::string sname(name); - Named_object* named_object = - Named_object::make_type(sname, NULL, float_type, - Linemap::predeclared_location()); - Named_type* named_type = named_object->type_value(); - std::pair<Named_float_types::iterator, bool> ins = - Float_type::named_float_types.insert(std::make_pair(sname, named_type)); - go_assert(ins.second); - return named_type; -} - -// Look up an existing float type. - -Named_type* -Float_type::lookup_float_type(const char* name) -{ - Named_float_types::const_iterator p = - Float_type::named_float_types.find(name); - go_assert(p != Float_type::named_float_types.end()); - return p->second; -} - -// Create a new abstract float type. - -Float_type* -Float_type::create_abstract_float_type() -{ - static Float_type* abstract_type; - if (abstract_type == NULL) - abstract_type = new Float_type(true, 64, RUNTIME_TYPE_KIND_FLOAT64); - return abstract_type; -} - -// Whether this type is identical with T. - -bool -Float_type::is_identical(const Float_type* t) const -{ - if (this->bits_ != t->bits_) - return false; - return this->is_abstract_ == t->is_abstract_; -} - -// Hash code. - -unsigned int -Float_type::do_hash_for_method(Gogo*) const -{ - return (this->bits_ << 4) + ((this->is_abstract_ ? 1 : 0) << 8); -} - -// Convert to the backend representation. - -Btype* -Float_type::do_get_backend(Gogo* gogo) -{ - return gogo->backend()->float_type(this->bits_); -} - -// The type descriptor for a float type. Float types are always named. - -Expression* -Float_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - go_assert(name != NULL || saw_errors()); - return this->plain_type_descriptor(gogo, this->runtime_type_kind_, name); -} - -// We should not be asked for the reflection string of a basic type. - -void -Float_type::do_reflection(Gogo*, std::string*) const -{ - go_assert(saw_errors()); -} - -// Mangled name. - -void -Float_type::do_mangled_name(Gogo*, std::string* ret) const -{ - char buf[100]; - snprintf(buf, sizeof buf, "f%s%de", - this->is_abstract_ ? "a" : "", - this->bits_); - ret->append(buf); -} - -// Make a floating point type. - -Named_type* -Type::make_float_type(const char* name, int bits, int runtime_type_kind) -{ - return Float_type::create_float_type(name, bits, runtime_type_kind); -} - -// Make an abstract float type. - -Float_type* -Type::make_abstract_float_type() -{ - return Float_type::create_abstract_float_type(); -} - -// Look up a float type. - -Named_type* -Type::lookup_float_type(const char* name) -{ - return Float_type::lookup_float_type(name); -} - -// Class Complex_type. - -Complex_type::Named_complex_types Complex_type::named_complex_types; - -// Create a new complex type. Non-abstract complex types always have -// names. - -Named_type* -Complex_type::create_complex_type(const char* name, int bits, - int runtime_type_kind) -{ - Complex_type* complex_type = new Complex_type(false, bits, - runtime_type_kind); - std::string sname(name); - Named_object* named_object = - Named_object::make_type(sname, NULL, complex_type, - Linemap::predeclared_location()); - Named_type* named_type = named_object->type_value(); - std::pair<Named_complex_types::iterator, bool> ins = - Complex_type::named_complex_types.insert(std::make_pair(sname, - named_type)); - go_assert(ins.second); - return named_type; -} - -// Look up an existing complex type. - -Named_type* -Complex_type::lookup_complex_type(const char* name) -{ - Named_complex_types::const_iterator p = - Complex_type::named_complex_types.find(name); - go_assert(p != Complex_type::named_complex_types.end()); - return p->second; -} - -// Create a new abstract complex type. - -Complex_type* -Complex_type::create_abstract_complex_type() -{ - static Complex_type* abstract_type; - if (abstract_type == NULL) - abstract_type = new Complex_type(true, 128, RUNTIME_TYPE_KIND_COMPLEX128); - return abstract_type; -} - -// Whether this type is identical with T. - -bool -Complex_type::is_identical(const Complex_type *t) const -{ - if (this->bits_ != t->bits_) - return false; - return this->is_abstract_ == t->is_abstract_; -} - -// Hash code. - -unsigned int -Complex_type::do_hash_for_method(Gogo*) const -{ - return (this->bits_ << 4) + ((this->is_abstract_ ? 1 : 0) << 8); -} - -// Convert to the backend representation. - -Btype* -Complex_type::do_get_backend(Gogo* gogo) -{ - return gogo->backend()->complex_type(this->bits_); -} - -// The type descriptor for a complex type. Complex types are always -// named. - -Expression* -Complex_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - go_assert(name != NULL || saw_errors()); - return this->plain_type_descriptor(gogo, this->runtime_type_kind_, name); -} - -// We should not be asked for the reflection string of a basic type. - -void -Complex_type::do_reflection(Gogo*, std::string*) const -{ - go_assert(saw_errors()); -} - -// Mangled name. - -void -Complex_type::do_mangled_name(Gogo*, std::string* ret) const -{ - char buf[100]; - snprintf(buf, sizeof buf, "c%s%de", - this->is_abstract_ ? "a" : "", - this->bits_); - ret->append(buf); -} - -// Make a complex type. - -Named_type* -Type::make_complex_type(const char* name, int bits, int runtime_type_kind) -{ - return Complex_type::create_complex_type(name, bits, runtime_type_kind); -} - -// Make an abstract complex type. - -Complex_type* -Type::make_abstract_complex_type() -{ - return Complex_type::create_abstract_complex_type(); -} - -// Look up a complex type. - -Named_type* -Type::lookup_complex_type(const char* name) -{ - return Complex_type::lookup_complex_type(name); -} - -// Class String_type. - -// Convert String_type to the backend representation. A string is a -// struct with two fields: a pointer to the characters and a length. - -Btype* -String_type::do_get_backend(Gogo* gogo) -{ - static Btype* backend_string_type; - if (backend_string_type == NULL) - { - std::vector<Backend::Btyped_identifier> fields(2); - - Type* b = gogo->lookup_global("byte")->type_value(); - Type* pb = Type::make_pointer_type(b); - - // We aren't going to get back to this field to finish the - // backend representation, so force it to be finished now. - if (!gogo->named_types_are_converted()) - { - Btype* bt = pb->get_backend_placeholder(gogo); - pb->finish_backend(gogo, bt); - } - - fields[0].name = "__data"; - fields[0].btype = pb->get_backend(gogo); - fields[0].location = Linemap::predeclared_location(); - - Type* int_type = Type::lookup_integer_type("int"); - fields[1].name = "__length"; - fields[1].btype = int_type->get_backend(gogo); - fields[1].location = fields[0].location; - - backend_string_type = gogo->backend()->struct_type(fields); - } - return backend_string_type; -} - -// Return a tree for the length of STRING. - -tree -String_type::length_tree(Gogo*, tree string) -{ - tree string_type = TREE_TYPE(string); - go_assert(TREE_CODE(string_type) == RECORD_TYPE); - tree length_field = DECL_CHAIN(TYPE_FIELDS(string_type)); - go_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(length_field)), - "__length") == 0); - return fold_build3(COMPONENT_REF, TREE_TYPE(length_field), string, - length_field, NULL_TREE); -} - -// Return a tree for a pointer to the bytes of STRING. - -tree -String_type::bytes_tree(Gogo*, tree string) -{ - tree string_type = TREE_TYPE(string); - go_assert(TREE_CODE(string_type) == RECORD_TYPE); - tree bytes_field = TYPE_FIELDS(string_type); - go_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(bytes_field)), - "__data") == 0); - return fold_build3(COMPONENT_REF, TREE_TYPE(bytes_field), string, - bytes_field, NULL_TREE); -} - -// The type descriptor for the string type. - -Expression* -String_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - if (name != NULL) - return this->plain_type_descriptor(gogo, RUNTIME_TYPE_KIND_STRING, name); - else - { - Named_object* no = gogo->lookup_global("string"); - go_assert(no != NULL); - return Type::type_descriptor(gogo, no->type_value()); - } -} - -// We should not be asked for the reflection string of a basic type. - -void -String_type::do_reflection(Gogo*, std::string* ret) const -{ - ret->append("string"); -} - -// Mangled name of a string type. - -void -String_type::do_mangled_name(Gogo*, std::string* ret) const -{ - ret->push_back('z'); -} - -// Make a string type. - -Type* -Type::make_string_type() -{ - static String_type string_type; - return &string_type; -} - -// The named type "string". - -static Named_type* named_string_type; - -// Get the named type "string". - -Named_type* -Type::lookup_string_type() -{ - return named_string_type; -} - -// Make the named type string. - -Named_type* -Type::make_named_string_type() -{ - Type* string_type = Type::make_string_type(); - Named_object* named_object = - Named_object::make_type("string", NULL, string_type, - Linemap::predeclared_location()); - Named_type* named_type = named_object->type_value(); - named_string_type = named_type; - return named_type; -} - -// The sink type. This is the type of the blank identifier _. Any -// type may be assigned to it. - -class Sink_type : public Type -{ - public: - Sink_type() - : Type(TYPE_SINK) - { } - - protected: - bool - do_compare_is_identity(Gogo*) - { return false; } - - Btype* - do_get_backend(Gogo*) - { go_unreachable(); } - - Expression* - do_type_descriptor(Gogo*, Named_type*) - { go_unreachable(); } - - void - do_reflection(Gogo*, std::string*) const - { go_unreachable(); } - - void - do_mangled_name(Gogo*, std::string*) const - { go_unreachable(); } -}; - -// Make the sink type. - -Type* -Type::make_sink_type() -{ - static Sink_type sink_type; - return &sink_type; -} - -// Class Function_type. - -// Traversal. - -int -Function_type::do_traverse(Traverse* traverse) -{ - if (this->receiver_ != NULL - && Type::traverse(this->receiver_->type(), traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - if (this->parameters_ != NULL - && this->parameters_->traverse(traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - if (this->results_ != NULL - && this->results_->traverse(traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - return TRAVERSE_CONTINUE; -} - -// Returns whether T is a valid redeclaration of this type. If this -// returns false, and REASON is not NULL, *REASON may be set to a -// brief explanation of why it returned false. - -bool -Function_type::is_valid_redeclaration(const Function_type* t, - std::string* reason) const -{ - if (!this->is_identical(t, false, true, reason)) - return false; - - // A redeclaration of a function is required to use the same names - // for the receiver and parameters. - if (this->receiver() != NULL - && this->receiver()->name() != t->receiver()->name()) - { - if (reason != NULL) - *reason = "receiver name changed"; - return false; - } - - const Typed_identifier_list* parms1 = this->parameters(); - const Typed_identifier_list* parms2 = t->parameters(); - if (parms1 != NULL) - { - Typed_identifier_list::const_iterator p1 = parms1->begin(); - for (Typed_identifier_list::const_iterator p2 = parms2->begin(); - p2 != parms2->end(); - ++p2, ++p1) - { - if (p1->name() != p2->name()) - { - if (reason != NULL) - *reason = "parameter name changed"; - return false; - } - - // This is called at parse time, so we may have unknown - // types. - Type* t1 = p1->type()->forwarded(); - Type* t2 = p2->type()->forwarded(); - if (t1 != t2 - && t1->forward_declaration_type() != NULL - && (t2->forward_declaration_type() == NULL - || (t1->forward_declaration_type()->named_object() - != t2->forward_declaration_type()->named_object()))) - return false; - } - } - - const Typed_identifier_list* results1 = this->results(); - const Typed_identifier_list* results2 = t->results(); - if (results1 != NULL) - { - Typed_identifier_list::const_iterator res1 = results1->begin(); - for (Typed_identifier_list::const_iterator res2 = results2->begin(); - res2 != results2->end(); - ++res2, ++res1) - { - if (res1->name() != res2->name()) - { - if (reason != NULL) - *reason = "result name changed"; - return false; - } - - // This is called at parse time, so we may have unknown - // types. - Type* t1 = res1->type()->forwarded(); - Type* t2 = res2->type()->forwarded(); - if (t1 != t2 - && t1->forward_declaration_type() != NULL - && (t2->forward_declaration_type() == NULL - || (t1->forward_declaration_type()->named_object() - != t2->forward_declaration_type()->named_object()))) - return false; - } - } - - return true; -} - -// Check whether T is the same as this type. - -bool -Function_type::is_identical(const Function_type* t, bool ignore_receiver, - bool errors_are_identical, - std::string* reason) const -{ - if (!ignore_receiver) - { - const Typed_identifier* r1 = this->receiver(); - const Typed_identifier* r2 = t->receiver(); - if ((r1 != NULL) != (r2 != NULL)) - { - if (reason != NULL) - *reason = _("different receiver types"); - return false; - } - if (r1 != NULL) - { - if (!Type::are_identical(r1->type(), r2->type(), errors_are_identical, - reason)) - { - if (reason != NULL && !reason->empty()) - *reason = "receiver: " + *reason; - return false; - } - } - } - - const Typed_identifier_list* parms1 = this->parameters(); - const Typed_identifier_list* parms2 = t->parameters(); - if ((parms1 != NULL) != (parms2 != NULL)) - { - if (reason != NULL) - *reason = _("different number of parameters"); - return false; - } - if (parms1 != NULL) - { - Typed_identifier_list::const_iterator p1 = parms1->begin(); - for (Typed_identifier_list::const_iterator p2 = parms2->begin(); - p2 != parms2->end(); - ++p2, ++p1) - { - if (p1 == parms1->end()) - { - if (reason != NULL) - *reason = _("different number of parameters"); - return false; - } - - if (!Type::are_identical(p1->type(), p2->type(), - errors_are_identical, NULL)) - { - if (reason != NULL) - *reason = _("different parameter types"); - return false; - } - } - if (p1 != parms1->end()) - { - if (reason != NULL) - *reason = _("different number of parameters"); - return false; - } - } - - if (this->is_varargs() != t->is_varargs()) - { - if (reason != NULL) - *reason = _("different varargs"); - return false; - } - - const Typed_identifier_list* results1 = this->results(); - const Typed_identifier_list* results2 = t->results(); - if ((results1 != NULL) != (results2 != NULL)) - { - if (reason != NULL) - *reason = _("different number of results"); - return false; - } - if (results1 != NULL) - { - Typed_identifier_list::const_iterator res1 = results1->begin(); - for (Typed_identifier_list::const_iterator res2 = results2->begin(); - res2 != results2->end(); - ++res2, ++res1) - { - if (res1 == results1->end()) - { - if (reason != NULL) - *reason = _("different number of results"); - return false; - } - - if (!Type::are_identical(res1->type(), res2->type(), - errors_are_identical, NULL)) - { - if (reason != NULL) - *reason = _("different result types"); - return false; - } - } - if (res1 != results1->end()) - { - if (reason != NULL) - *reason = _("different number of results"); - return false; - } - } - - return true; -} - -// Hash code. - -unsigned int -Function_type::do_hash_for_method(Gogo* gogo) const -{ - unsigned int ret = 0; - // We ignore the receiver type for hash codes, because we need to - // get the same hash code for a method in an interface and a method - // declared for a type. The former will not have a receiver. - if (this->parameters_ != NULL) - { - int shift = 1; - for (Typed_identifier_list::const_iterator p = this->parameters_->begin(); - p != this->parameters_->end(); - ++p, ++shift) - ret += p->type()->hash_for_method(gogo) << shift; - } - if (this->results_ != NULL) - { - int shift = 2; - for (Typed_identifier_list::const_iterator p = this->results_->begin(); - p != this->results_->end(); - ++p, ++shift) - ret += p->type()->hash_for_method(gogo) << shift; - } - if (this->is_varargs_) - ret += 1; - ret <<= 4; - return ret; -} - -// Get the backend representation for a function type. - -Btype* -Function_type::do_get_backend(Gogo* gogo) -{ - Backend::Btyped_identifier breceiver; - if (this->receiver_ != NULL) - { - breceiver.name = Gogo::unpack_hidden_name(this->receiver_->name()); - - // We always pass the address of the receiver parameter, in - // order to make interface calls work with unknown types. - Type* rtype = this->receiver_->type(); - if (rtype->points_to() == NULL) - rtype = Type::make_pointer_type(rtype); - breceiver.btype = rtype->get_backend(gogo); - breceiver.location = this->receiver_->location(); - } - - std::vector<Backend::Btyped_identifier> bparameters; - if (this->parameters_ != NULL) - { - bparameters.resize(this->parameters_->size()); - size_t i = 0; - for (Typed_identifier_list::const_iterator p = this->parameters_->begin(); - p != this->parameters_->end(); - ++p, ++i) - { - bparameters[i].name = Gogo::unpack_hidden_name(p->name()); - bparameters[i].btype = p->type()->get_backend(gogo); - bparameters[i].location = p->location(); - } - go_assert(i == bparameters.size()); - } - - std::vector<Backend::Btyped_identifier> bresults; - if (this->results_ != NULL) - { - bresults.resize(this->results_->size()); - size_t i = 0; - for (Typed_identifier_list::const_iterator p = this->results_->begin(); - p != this->results_->end(); - ++p, ++i) - { - bresults[i].name = Gogo::unpack_hidden_name(p->name()); - bresults[i].btype = p->type()->get_backend(gogo); - bresults[i].location = p->location(); - } - go_assert(i == bresults.size()); - } - - return gogo->backend()->function_type(breceiver, bparameters, bresults, - this->location()); -} - -// The type of a function type descriptor. - -Type* -Function_type::make_function_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Type* bool_type = Type::lookup_bool_type(); - - Type* slice_type = Type::make_array_type(ptdt, NULL); - - Struct_type* s = Type::make_builtin_struct_type(4, - "", tdt, - "dotdotdot", bool_type, - "in", slice_type, - "out", slice_type); - - ret = Type::make_builtin_named_type("FuncType", s); - } - - return ret; -} - -// The type descriptor for a function type. - -Expression* -Function_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* ftdt = Function_type::make_function_type_descriptor_type(); - - const Struct_field_list* fields = ftdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(4); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_FUNC, - name, NULL, true)); - - ++p; - go_assert(p->is_field_name("dotdotdot")); - vals->push_back(Expression::make_boolean(this->is_varargs(), bloc)); - - ++p; - go_assert(p->is_field_name("in")); - vals->push_back(this->type_descriptor_params(p->type(), this->receiver(), - this->parameters())); - - ++p; - go_assert(p->is_field_name("out")); - vals->push_back(this->type_descriptor_params(p->type(), NULL, - this->results())); - - ++p; - go_assert(p == fields->end()); - - return Expression::make_struct_composite_literal(ftdt, vals, bloc); -} - -// Return a composite literal for the parameters or results of a type -// descriptor. - -Expression* -Function_type::type_descriptor_params(Type* params_type, - const Typed_identifier* receiver, - const Typed_identifier_list* params) -{ - Location bloc = Linemap::predeclared_location(); - - if (receiver == NULL && params == NULL) - return Expression::make_slice_composite_literal(params_type, NULL, bloc); - - Expression_list* vals = new Expression_list(); - vals->reserve((params == NULL ? 0 : params->size()) - + (receiver != NULL ? 1 : 0)); - - if (receiver != NULL) - vals->push_back(Expression::make_type_descriptor(receiver->type(), bloc)); - - if (params != NULL) - { - for (Typed_identifier_list::const_iterator p = params->begin(); - p != params->end(); - ++p) - vals->push_back(Expression::make_type_descriptor(p->type(), bloc)); - } - - return Expression::make_slice_composite_literal(params_type, vals, bloc); -} - -// The reflection string. - -void -Function_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - // FIXME: Turn this off until we straighten out the type of the - // struct field used in a go statement which calls a method. - // go_assert(this->receiver_ == NULL); - - ret->append("func"); - - if (this->receiver_ != NULL) - { - ret->push_back('('); - this->append_reflection(this->receiver_->type(), gogo, ret); - ret->push_back(')'); - } - - ret->push_back('('); - const Typed_identifier_list* params = this->parameters(); - if (params != NULL) - { - bool is_varargs = this->is_varargs_; - for (Typed_identifier_list::const_iterator p = params->begin(); - p != params->end(); - ++p) - { - if (p != params->begin()) - ret->append(", "); - if (!is_varargs || p + 1 != params->end()) - this->append_reflection(p->type(), gogo, ret); - else - { - ret->append("..."); - this->append_reflection(p->type()->array_type()->element_type(), - gogo, ret); - } - } - } - ret->push_back(')'); - - const Typed_identifier_list* results = this->results(); - if (results != NULL && !results->empty()) - { - if (results->size() == 1) - ret->push_back(' '); - else - ret->append(" ("); - for (Typed_identifier_list::const_iterator p = results->begin(); - p != results->end(); - ++p) - { - if (p != results->begin()) - ret->append(", "); - this->append_reflection(p->type(), gogo, ret); - } - if (results->size() > 1) - ret->push_back(')'); - } -} - -// Mangled name. - -void -Function_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - ret->push_back('F'); - - if (this->receiver_ != NULL) - { - ret->push_back('m'); - this->append_mangled_name(this->receiver_->type(), gogo, ret); - } - - const Typed_identifier_list* params = this->parameters(); - if (params != NULL) - { - ret->push_back('p'); - for (Typed_identifier_list::const_iterator p = params->begin(); - p != params->end(); - ++p) - this->append_mangled_name(p->type(), gogo, ret); - if (this->is_varargs_) - ret->push_back('V'); - ret->push_back('e'); - } - - const Typed_identifier_list* results = this->results(); - if (results != NULL) - { - ret->push_back('r'); - for (Typed_identifier_list::const_iterator p = results->begin(); - p != results->end(); - ++p) - this->append_mangled_name(p->type(), gogo, ret); - ret->push_back('e'); - } - - ret->push_back('e'); -} - -// Export a function type. - -void -Function_type::do_export(Export* exp) const -{ - // We don't write out the receiver. The only function types which - // should have a receiver are the ones associated with explicitly - // defined methods. For those the receiver type is written out by - // Function::export_func. - - exp->write_c_string("("); - bool first = true; - if (this->parameters_ != NULL) - { - bool is_varargs = this->is_varargs_; - for (Typed_identifier_list::const_iterator p = - this->parameters_->begin(); - p != this->parameters_->end(); - ++p) - { - if (first) - first = false; - else - exp->write_c_string(", "); - exp->write_name(p->name()); - exp->write_c_string(" "); - if (!is_varargs || p + 1 != this->parameters_->end()) - exp->write_type(p->type()); - else - { - exp->write_c_string("..."); - exp->write_type(p->type()->array_type()->element_type()); - } - } - } - exp->write_c_string(")"); - - const Typed_identifier_list* results = this->results_; - if (results != NULL) - { - exp->write_c_string(" "); - if (results->size() == 1 && results->begin()->name().empty()) - exp->write_type(results->begin()->type()); - else - { - first = true; - exp->write_c_string("("); - for (Typed_identifier_list::const_iterator p = results->begin(); - p != results->end(); - ++p) - { - if (first) - first = false; - else - exp->write_c_string(", "); - exp->write_name(p->name()); - exp->write_c_string(" "); - exp->write_type(p->type()); - } - exp->write_c_string(")"); - } - } -} - -// Import a function type. - -Function_type* -Function_type::do_import(Import* imp) -{ - imp->require_c_string("("); - Typed_identifier_list* parameters; - bool is_varargs = false; - if (imp->peek_char() == ')') - parameters = NULL; - else - { - parameters = new Typed_identifier_list(); - while (true) - { - std::string name = imp->read_name(); - imp->require_c_string(" "); - - if (imp->match_c_string("...")) - { - imp->advance(3); - is_varargs = true; - } - - Type* ptype = imp->read_type(); - if (is_varargs) - ptype = Type::make_array_type(ptype, NULL); - parameters->push_back(Typed_identifier(name, ptype, - imp->location())); - if (imp->peek_char() != ',') - break; - go_assert(!is_varargs); - imp->require_c_string(", "); - } - } - imp->require_c_string(")"); - - Typed_identifier_list* results; - if (imp->peek_char() != ' ') - results = NULL; - else - { - imp->advance(1); - results = new Typed_identifier_list; - if (imp->peek_char() != '(') - { - Type* rtype = imp->read_type(); - results->push_back(Typed_identifier("", rtype, imp->location())); - } - else - { - imp->advance(1); - while (true) - { - std::string name = imp->read_name(); - imp->require_c_string(" "); - Type* rtype = imp->read_type(); - results->push_back(Typed_identifier(name, rtype, - imp->location())); - if (imp->peek_char() != ',') - break; - imp->require_c_string(", "); - } - imp->require_c_string(")"); - } - } - - Function_type* ret = Type::make_function_type(NULL, parameters, results, - imp->location()); - if (is_varargs) - ret->set_is_varargs(); - return ret; -} - -// Make a copy of a function type without a receiver. - -Function_type* -Function_type::copy_without_receiver() const -{ - go_assert(this->is_method()); - Function_type *ret = Type::make_function_type(NULL, this->parameters_, - this->results_, - this->location_); - if (this->is_varargs()) - ret->set_is_varargs(); - if (this->is_builtin()) - ret->set_is_builtin(); - return ret; -} - -// Make a copy of a function type with a receiver. - -Function_type* -Function_type::copy_with_receiver(Type* receiver_type) const -{ - go_assert(!this->is_method()); - Typed_identifier* receiver = new Typed_identifier("", receiver_type, - this->location_); - Function_type* ret = Type::make_function_type(receiver, this->parameters_, - this->results_, - this->location_); - if (this->is_varargs_) - ret->set_is_varargs(); - return ret; -} - -// Make a function type. - -Function_type* -Type::make_function_type(Typed_identifier* receiver, - Typed_identifier_list* parameters, - Typed_identifier_list* results, - Location location) -{ - return new Function_type(receiver, parameters, results, location); -} - -// Class Pointer_type. - -// Traversal. - -int -Pointer_type::do_traverse(Traverse* traverse) -{ - return Type::traverse(this->to_type_, traverse); -} - -// Hash code. - -unsigned int -Pointer_type::do_hash_for_method(Gogo* gogo) const -{ - return this->to_type_->hash_for_method(gogo) << 4; -} - -// Get the backend representation for a pointer type. - -Btype* -Pointer_type::do_get_backend(Gogo* gogo) -{ - Btype* to_btype = this->to_type_->get_backend(gogo); - return gogo->backend()->pointer_type(to_btype); -} - -// The type of a pointer type descriptor. - -Type* -Pointer_type::make_pointer_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Struct_type* s = Type::make_builtin_struct_type(2, - "", tdt, - "elem", ptdt); - - ret = Type::make_builtin_named_type("PtrType", s); - } - - return ret; -} - -// The type descriptor for a pointer type. - -Expression* -Pointer_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - if (this->is_unsafe_pointer_type()) - { - go_assert(name != NULL); - return this->plain_type_descriptor(gogo, - RUNTIME_TYPE_KIND_UNSAFE_POINTER, - name); - } - else - { - Location bloc = Linemap::predeclared_location(); - - const Methods* methods; - Type* deref = this->points_to(); - if (deref->named_type() != NULL) - methods = deref->named_type()->methods(); - else if (deref->struct_type() != NULL) - methods = deref->struct_type()->methods(); - else - methods = NULL; - - Type* ptr_tdt = Pointer_type::make_pointer_type_descriptor_type(); - - const Struct_field_list* fields = ptr_tdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(2); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_PTR, - name, methods, false)); - - ++p; - go_assert(p->is_field_name("elem")); - vals->push_back(Expression::make_type_descriptor(deref, bloc)); - - return Expression::make_struct_composite_literal(ptr_tdt, vals, bloc); - } -} - -// Reflection string. - -void -Pointer_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - ret->push_back('*'); - this->append_reflection(this->to_type_, gogo, ret); -} - -// Mangled name. - -void -Pointer_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - ret->push_back('p'); - this->append_mangled_name(this->to_type_, gogo, ret); -} - -// Export. - -void -Pointer_type::do_export(Export* exp) const -{ - exp->write_c_string("*"); - if (this->is_unsafe_pointer_type()) - exp->write_c_string("any"); - else - exp->write_type(this->to_type_); -} - -// Import. - -Pointer_type* -Pointer_type::do_import(Import* imp) -{ - imp->require_c_string("*"); - if (imp->match_c_string("any")) - { - imp->advance(3); - return Type::make_pointer_type(Type::make_void_type()); - } - Type* to = imp->read_type(); - return Type::make_pointer_type(to); -} - -// Make a pointer type. - -Pointer_type* -Type::make_pointer_type(Type* to_type) -{ - typedef Unordered_map(Type*, Pointer_type*) Hashtable; - static Hashtable pointer_types; - Hashtable::const_iterator p = pointer_types.find(to_type); - if (p != pointer_types.end()) - return p->second; - Pointer_type* ret = new Pointer_type(to_type); - pointer_types[to_type] = ret; - return ret; -} - -// The nil type. We use a special type for nil because it is not the -// same as any other type. In C term nil has type void*, but there is -// no such type in Go. - -class Nil_type : public Type -{ - public: - Nil_type() - : Type(TYPE_NIL) - { } - - protected: - bool - do_compare_is_identity(Gogo*) - { return false; } - - Btype* - do_get_backend(Gogo* gogo) - { return gogo->backend()->pointer_type(gogo->backend()->void_type()); } - - Expression* - do_type_descriptor(Gogo*, Named_type*) - { go_unreachable(); } - - void - do_reflection(Gogo*, std::string*) const - { go_unreachable(); } - - void - do_mangled_name(Gogo*, std::string* ret) const - { ret->push_back('n'); } -}; - -// Make the nil type. - -Type* -Type::make_nil_type() -{ - static Nil_type singleton_nil_type; - return &singleton_nil_type; -} - -// The type of a function call which returns multiple values. This is -// really a struct, but we don't want to confuse a function call which -// returns a struct with a function call which returns multiple -// values. - -class Call_multiple_result_type : public Type -{ - public: - Call_multiple_result_type(Call_expression* call) - : Type(TYPE_CALL_MULTIPLE_RESULT), - call_(call) - { } - - protected: - bool - do_has_pointer() const - { - go_assert(saw_errors()); - return false; - } - - bool - do_compare_is_identity(Gogo*) - { return false; } - - Btype* - do_get_backend(Gogo* gogo) - { - go_assert(saw_errors()); - return gogo->backend()->error_type(); - } - - Expression* - do_type_descriptor(Gogo*, Named_type*) - { - go_assert(saw_errors()); - return Expression::make_error(Linemap::unknown_location()); - } - - void - do_reflection(Gogo*, std::string*) const - { go_assert(saw_errors()); } - - void - do_mangled_name(Gogo*, std::string*) const - { go_assert(saw_errors()); } - - private: - // The expression being called. - Call_expression* call_; -}; - -// Make a call result type. - -Type* -Type::make_call_multiple_result_type(Call_expression* call) -{ - return new Call_multiple_result_type(call); -} - -// Class Struct_field. - -// Get the name of a field. - -const std::string& -Struct_field::field_name() const -{ - const std::string& name(this->typed_identifier_.name()); - if (!name.empty()) - return name; - else - { - // This is called during parsing, before anything is lowered, so - // we have to be pretty careful to avoid dereferencing an - // unknown type name. - Type* t = this->typed_identifier_.type(); - Type* dt = t; - if (t->classification() == Type::TYPE_POINTER) - { - // Very ugly. - Pointer_type* ptype = static_cast<Pointer_type*>(t); - dt = ptype->points_to(); - } - if (dt->forward_declaration_type() != NULL) - return dt->forward_declaration_type()->name(); - else if (dt->named_type() != NULL) - return dt->named_type()->name(); - else if (t->is_error_type() || dt->is_error_type()) - { - static const std::string error_string = "*error*"; - return error_string; - } - else - { - // Avoid crashing in the erroneous case where T is named but - // DT is not. - go_assert(t != dt); - if (t->forward_declaration_type() != NULL) - return t->forward_declaration_type()->name(); - else if (t->named_type() != NULL) - return t->named_type()->name(); - else - go_unreachable(); - } - } -} - -// Return whether this field is named NAME. - -bool -Struct_field::is_field_name(const std::string& name) const -{ - const std::string& me(this->typed_identifier_.name()); - if (!me.empty()) - return me == name; - else - { - Type* t = this->typed_identifier_.type(); - if (t->points_to() != NULL) - t = t->points_to(); - Named_type* nt = t->named_type(); - if (nt != NULL && nt->name() == name) - return true; - - // This is a horrible hack caused by the fact that we don't pack - // the names of builtin types. FIXME. - if (nt != NULL - && nt->is_builtin() - && nt->name() == Gogo::unpack_hidden_name(name)) - return true; - - return false; - } -} - -// Class Struct_type. - -// A hash table used to find identical unnamed structs so that they -// share method tables. - -Struct_type::Identical_structs Struct_type::identical_structs; - -// Traversal. - -int -Struct_type::do_traverse(Traverse* traverse) -{ - Struct_field_list* fields = this->fields_; - if (fields != NULL) - { - for (Struct_field_list::iterator p = fields->begin(); - p != fields->end(); - ++p) - { - if (Type::traverse(p->type(), traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - } - } - return TRAVERSE_CONTINUE; -} - -// Verify that the struct type is complete and valid. - -bool -Struct_type::do_verify() -{ - Struct_field_list* fields = this->fields_; - if (fields == NULL) - return true; - for (Struct_field_list::iterator p = fields->begin(); - p != fields->end(); - ++p) - { - Type* t = p->type(); - if (t->is_undefined()) - { - error_at(p->location(), "struct field type is incomplete"); - p->set_type(Type::make_error_type()); - } - else if (p->is_anonymous()) - { - if (t->named_type() != NULL && t->points_to() != NULL) - { - error_at(p->location(), "embedded type may not be a pointer"); - p->set_type(Type::make_error_type()); - } - else if (t->points_to() != NULL - && t->points_to()->interface_type() != NULL) - { - error_at(p->location(), - "embedded type may not be pointer to interface"); - p->set_type(Type::make_error_type()); - } - } - } - return true; -} - -// Whether this contains a pointer. - -bool -Struct_type::do_has_pointer() const -{ - const Struct_field_list* fields = this->fields(); - if (fields == NULL) - return false; - for (Struct_field_list::const_iterator p = fields->begin(); - p != fields->end(); - ++p) - { - if (p->type()->has_pointer()) - return true; - } - return false; -} - -// Whether this type is identical to T. - -bool -Struct_type::is_identical(const Struct_type* t, - bool errors_are_identical) const -{ - const Struct_field_list* fields1 = this->fields(); - const Struct_field_list* fields2 = t->fields(); - if (fields1 == NULL || fields2 == NULL) - return fields1 == fields2; - Struct_field_list::const_iterator pf2 = fields2->begin(); - for (Struct_field_list::const_iterator pf1 = fields1->begin(); - pf1 != fields1->end(); - ++pf1, ++pf2) - { - if (pf2 == fields2->end()) - return false; - if (pf1->field_name() != pf2->field_name()) - return false; - if (pf1->is_anonymous() != pf2->is_anonymous() - || !Type::are_identical(pf1->type(), pf2->type(), - errors_are_identical, NULL)) - return false; - if (!pf1->has_tag()) - { - if (pf2->has_tag()) - return false; - } - else - { - if (!pf2->has_tag()) - return false; - if (pf1->tag() != pf2->tag()) - return false; - } - } - if (pf2 != fields2->end()) - return false; - return true; -} - -// Whether this struct type has any hidden fields. - -bool -Struct_type::struct_has_hidden_fields(const Named_type* within, - std::string* reason) const -{ - const Struct_field_list* fields = this->fields(); - if (fields == NULL) - return false; - const Package* within_package = (within == NULL - ? NULL - : within->named_object()->package()); - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - { - if (within_package != NULL - && !pf->is_anonymous() - && Gogo::is_hidden_name(pf->field_name())) - { - if (reason != NULL) - { - std::string within_name = within->named_object()->message_name(); - std::string name = Gogo::message_name(pf->field_name()); - size_t bufsize = 200 + within_name.length() + name.length(); - char* buf = new char[bufsize]; - snprintf(buf, bufsize, - _("implicit assignment of %s%s%s hidden field %s%s%s"), - open_quote, within_name.c_str(), close_quote, - open_quote, name.c_str(), close_quote); - reason->assign(buf); - delete[] buf; - } - return true; - } - - if (pf->type()->has_hidden_fields(within, reason)) - return true; - } - - return false; -} - -// Whether comparisons of this struct type are simple identity -// comparisons. - -bool -Struct_type::do_compare_is_identity(Gogo* gogo) -{ - const Struct_field_list* fields = this->fields_; - if (fields == NULL) - return true; - unsigned int offset = 0; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - { - if (Gogo::is_sink_name(pf->field_name())) - return false; - - if (!pf->type()->compare_is_identity(gogo)) - return false; - - unsigned int field_align; - if (!pf->type()->backend_type_align(gogo, &field_align)) - return false; - if ((offset & (field_align - 1)) != 0) - { - // This struct has padding. We don't guarantee that that - // padding is zero-initialized for a stack variable, so we - // can't use memcmp to compare struct values. - return false; - } - - unsigned int field_size; - if (!pf->type()->backend_type_size(gogo, &field_size)) - return false; - offset += field_size; - } - - unsigned int struct_size; - if (!this->backend_type_size(gogo, &struct_size)) - return false; - if (offset != struct_size) - { - // Trailing padding may not be zero when on the stack. - return false; - } - - return true; -} - -// Build identity and hash functions for this struct. - -// Hash code. - -unsigned int -Struct_type::do_hash_for_method(Gogo* gogo) const -{ - unsigned int ret = 0; - if (this->fields() != NULL) - { - for (Struct_field_list::const_iterator pf = this->fields()->begin(); - pf != this->fields()->end(); - ++pf) - ret = (ret << 1) + pf->type()->hash_for_method(gogo); - } - return ret <<= 2; -} - -// Find the local field NAME. - -const Struct_field* -Struct_type::find_local_field(const std::string& name, - unsigned int *pindex) const -{ - const Struct_field_list* fields = this->fields_; - if (fields == NULL) - return NULL; - unsigned int i = 0; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf, ++i) - { - if (pf->is_field_name(name)) - { - if (pindex != NULL) - *pindex = i; - return &*pf; - } - } - return NULL; -} - -// Return an expression for field NAME in STRUCT_EXPR, or NULL. - -Field_reference_expression* -Struct_type::field_reference(Expression* struct_expr, const std::string& name, - Location location) const -{ - unsigned int depth; - return this->field_reference_depth(struct_expr, name, location, NULL, - &depth); -} - -// Return an expression for a field, along with the depth at which it -// was found. - -Field_reference_expression* -Struct_type::field_reference_depth(Expression* struct_expr, - const std::string& name, - Location location, - Saw_named_type* saw, - unsigned int* depth) const -{ - const Struct_field_list* fields = this->fields_; - if (fields == NULL) - return NULL; - - // Look for a field with this name. - unsigned int i = 0; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf, ++i) - { - if (pf->is_field_name(name)) - { - *depth = 0; - return Expression::make_field_reference(struct_expr, i, location); - } - } - - // Look for an anonymous field which contains a field with this - // name. - unsigned int found_depth = 0; - Field_reference_expression* ret = NULL; - i = 0; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf, ++i) - { - if (!pf->is_anonymous()) - continue; - - Struct_type* st = pf->type()->deref()->struct_type(); - if (st == NULL) - continue; - - Saw_named_type* hold_saw = saw; - Saw_named_type saw_here; - Named_type* nt = pf->type()->named_type(); - if (nt == NULL) - nt = pf->type()->deref()->named_type(); - if (nt != NULL) - { - Saw_named_type* q; - for (q = saw; q != NULL; q = q->next) - { - if (q->nt == nt) - { - // If this is an error, it will be reported - // elsewhere. - break; - } - } - if (q != NULL) - continue; - saw_here.next = saw; - saw_here.nt = nt; - saw = &saw_here; - } - - // Look for a reference using a NULL struct expression. If we - // find one, fill in the struct expression with a reference to - // this field. - unsigned int subdepth; - Field_reference_expression* sub = st->field_reference_depth(NULL, name, - location, - saw, - &subdepth); - - saw = hold_saw; - - if (sub == NULL) - continue; - - if (ret == NULL || subdepth < found_depth) - { - if (ret != NULL) - delete ret; - ret = sub; - found_depth = subdepth; - Expression* here = Expression::make_field_reference(struct_expr, i, - location); - if (pf->type()->points_to() != NULL) - here = Expression::make_unary(OPERATOR_MULT, here, location); - while (sub->expr() != NULL) - { - sub = sub->expr()->deref()->field_reference_expression(); - go_assert(sub != NULL); - } - sub->set_struct_expression(here); - } - else if (subdepth > found_depth) - delete sub; - else - { - // We do not handle ambiguity here--it should be handled by - // Type::bind_field_or_method. - delete sub; - found_depth = 0; - ret = NULL; - } - } - - if (ret != NULL) - *depth = found_depth + 1; - - return ret; -} - -// Return the total number of fields, including embedded fields. - -unsigned int -Struct_type::total_field_count() const -{ - if (this->fields_ == NULL) - return 0; - unsigned int ret = 0; - for (Struct_field_list::const_iterator pf = this->fields_->begin(); - pf != this->fields_->end(); - ++pf) - { - if (!pf->is_anonymous() || pf->type()->struct_type() == NULL) - ++ret; - else - ret += pf->type()->struct_type()->total_field_count(); - } - return ret; -} - -// Return whether NAME is an unexported field, for better error reporting. - -bool -Struct_type::is_unexported_local_field(Gogo* gogo, - const std::string& name) const -{ - const Struct_field_list* fields = this->fields_; - if (fields != NULL) - { - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - { - const std::string& field_name(pf->field_name()); - if (Gogo::is_hidden_name(field_name) - && name == Gogo::unpack_hidden_name(field_name) - && gogo->pack_hidden_name(name, false) != field_name) - return true; - } - } - return false; -} - -// Finalize the methods of an unnamed struct. - -void -Struct_type::finalize_methods(Gogo* gogo) -{ - if (this->all_methods_ != NULL) - return; - - // It is possible to have multiple identical structs that have - // methods. We want them to share method tables. Otherwise we will - // emit identical methods more than once, which is bad since they - // will even have the same names. - std::pair<Identical_structs::iterator, bool> ins = - Struct_type::identical_structs.insert(std::make_pair(this, this)); - if (!ins.second) - { - // An identical struct was already entered into the hash table. - // Note that finalize_methods is, fortunately, not recursive. - this->all_methods_ = ins.first->second->all_methods_; - return; - } - - Type::finalize_methods(gogo, this, this->location_, &this->all_methods_); -} - -// Return the method NAME, or NULL if there isn't one or if it is -// ambiguous. Set *IS_AMBIGUOUS if the method exists but is -// ambiguous. - -Method* -Struct_type::method_function(const std::string& name, bool* is_ambiguous) const -{ - return Type::method_function(this->all_methods_, name, is_ambiguous); -} - -// Return a pointer to the interface method table for this type for -// the interface INTERFACE. IS_POINTER is true if this is for a -// pointer to THIS. - -tree -Struct_type::interface_method_table(Gogo* gogo, - const Interface_type* interface, - bool is_pointer) -{ - return Type::interface_method_table(gogo, this, interface, is_pointer, - &this->interface_method_tables_, - &this->pointer_interface_method_tables_); -} - -// Convert struct fields to the backend representation. This is not -// declared in types.h so that types.h doesn't have to #include -// backend.h. - -static void -get_backend_struct_fields(Gogo* gogo, const Struct_field_list* fields, - bool use_placeholder, - std::vector<Backend::Btyped_identifier>* bfields) -{ - bfields->resize(fields->size()); - size_t i = 0; - for (Struct_field_list::const_iterator p = fields->begin(); - p != fields->end(); - ++p, ++i) - { - (*bfields)[i].name = Gogo::unpack_hidden_name(p->field_name()); - (*bfields)[i].btype = (use_placeholder - ? p->type()->get_backend_placeholder(gogo) - : p->type()->get_backend(gogo)); - (*bfields)[i].location = p->location(); - } - go_assert(i == fields->size()); -} - -// Get the tree for a struct type. - -Btype* -Struct_type::do_get_backend(Gogo* gogo) -{ - std::vector<Backend::Btyped_identifier> bfields; - get_backend_struct_fields(gogo, this->fields_, false, &bfields); - return gogo->backend()->struct_type(bfields); -} - -// Finish the backend representation of the fields of a struct. - -void -Struct_type::finish_backend_fields(Gogo* gogo) -{ - const Struct_field_list* fields = this->fields_; - if (fields != NULL) - { - for (Struct_field_list::const_iterator p = fields->begin(); - p != fields->end(); - ++p) - p->type()->get_backend(gogo); - } -} - -// The type of a struct type descriptor. - -Type* -Struct_type::make_struct_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - Type* string_type = Type::lookup_string_type(); - Type* pointer_string_type = Type::make_pointer_type(string_type); - - Struct_type* sf = - Type::make_builtin_struct_type(5, - "name", pointer_string_type, - "pkgPath", pointer_string_type, - "typ", ptdt, - "tag", pointer_string_type, - "offset", uintptr_type); - Type* nsf = Type::make_builtin_named_type("structField", sf); - - Type* slice_type = Type::make_array_type(nsf, NULL); - - Struct_type* s = Type::make_builtin_struct_type(2, - "", tdt, - "fields", slice_type); - - ret = Type::make_builtin_named_type("StructType", s); - } - - return ret; -} - -// Build a type descriptor for a struct type. - -Expression* -Struct_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* stdt = Struct_type::make_struct_type_descriptor_type(); - - const Struct_field_list* fields = stdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(2); - - const Methods* methods = this->methods(); - // A named struct should not have methods--the methods should attach - // to the named type. - go_assert(methods == NULL || name == NULL); - - Struct_field_list::const_iterator ps = fields->begin(); - go_assert(ps->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_STRUCT, - name, methods, true)); - - ++ps; - go_assert(ps->is_field_name("fields")); - - Expression_list* elements = new Expression_list(); - elements->reserve(this->fields_->size()); - Type* element_type = ps->type()->array_type()->element_type(); - for (Struct_field_list::const_iterator pf = this->fields_->begin(); - pf != this->fields_->end(); - ++pf) - { - const Struct_field_list* f = element_type->struct_type()->fields(); - - Expression_list* fvals = new Expression_list(); - fvals->reserve(5); - - Struct_field_list::const_iterator q = f->begin(); - go_assert(q->is_field_name("name")); - if (pf->is_anonymous()) - fvals->push_back(Expression::make_nil(bloc)); - else - { - std::string n = Gogo::unpack_hidden_name(pf->field_name()); - Expression* s = Expression::make_string(n, bloc); - fvals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - } - - ++q; - go_assert(q->is_field_name("pkgPath")); - if (!Gogo::is_hidden_name(pf->field_name())) - fvals->push_back(Expression::make_nil(bloc)); - else - { - std::string n = Gogo::hidden_name_pkgpath(pf->field_name()); - Expression* s = Expression::make_string(n, bloc); - fvals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - } - - ++q; - go_assert(q->is_field_name("typ")); - fvals->push_back(Expression::make_type_descriptor(pf->type(), bloc)); - - ++q; - go_assert(q->is_field_name("tag")); - if (!pf->has_tag()) - fvals->push_back(Expression::make_nil(bloc)); - else - { - Expression* s = Expression::make_string(pf->tag(), bloc); - fvals->push_back(Expression::make_unary(OPERATOR_AND, s, bloc)); - } - - ++q; - go_assert(q->is_field_name("offset")); - fvals->push_back(Expression::make_struct_field_offset(this, &*pf)); - - Expression* v = Expression::make_struct_composite_literal(element_type, - fvals, bloc); - elements->push_back(v); - } - - vals->push_back(Expression::make_slice_composite_literal(ps->type(), - elements, bloc)); - - return Expression::make_struct_composite_literal(stdt, vals, bloc); -} - -// Write the hash function for a struct which can not use the identity -// function. - -void -Struct_type::write_hash_function(Gogo* gogo, Named_type*, - Function_type* hash_fntype, - Function_type* equal_fntype) -{ - Location bloc = Linemap::predeclared_location(); - - // The pointer to the struct that we are going to hash. This is an - // argument to the hash function we are implementing here. - Named_object* key_arg = gogo->lookup("key", NULL); - go_assert(key_arg != NULL); - Type* key_arg_type = key_arg->var_value()->type(); - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - - // Get a 0. - mpz_t ival; - mpz_init_set_ui(ival, 0); - Expression* zero = Expression::make_integer(&ival, uintptr_type, bloc); - mpz_clear(ival); - - // Make a temporary to hold the return value, initialized to 0. - Temporary_statement* retval = Statement::make_temporary(uintptr_type, zero, - bloc); - gogo->add_statement(retval); - - // Make a temporary to hold the key as a uintptr. - Expression* ref = Expression::make_var_reference(key_arg, bloc); - ref = Expression::make_cast(uintptr_type, ref, bloc); - Temporary_statement* key = Statement::make_temporary(uintptr_type, ref, - bloc); - gogo->add_statement(key); - - // Loop over the struct fields. - bool first = true; - const Struct_field_list* fields = this->fields_; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - { - if (Gogo::is_sink_name(pf->field_name())) - continue; - - if (first) - first = false; - else - { - // Multiply retval by 33. - mpz_init_set_ui(ival, 33); - Expression* i33 = Expression::make_integer(&ival, uintptr_type, - bloc); - mpz_clear(ival); - - ref = Expression::make_temporary_reference(retval, bloc); - Statement* s = Statement::make_assignment_operation(OPERATOR_MULTEQ, - ref, i33, bloc); - gogo->add_statement(s); - } - - // Get a pointer to the value of this field. - Expression* offset = Expression::make_struct_field_offset(this, &*pf); - ref = Expression::make_temporary_reference(key, bloc); - Expression* subkey = Expression::make_binary(OPERATOR_PLUS, ref, offset, - bloc); - subkey = Expression::make_cast(key_arg_type, subkey, bloc); - - // Get the size of this field. - Expression* size = Expression::make_type_info(pf->type(), - Expression::TYPE_INFO_SIZE); - - // Get the hash function to use for the type of this field. - Named_object* hash_fn; - Named_object* equal_fn; - pf->type()->type_functions(gogo, pf->type()->named_type(), hash_fntype, - equal_fntype, &hash_fn, &equal_fn); - - // Call the hash function for the field. - Expression_list* args = new Expression_list(); - args->push_back(subkey); - args->push_back(size); - Expression* func = Expression::make_func_reference(hash_fn, NULL, bloc); - Expression* call = Expression::make_call(func, args, false, bloc); - - // Add the field's hash value to retval. - Temporary_reference_expression* tref = - Expression::make_temporary_reference(retval, bloc); - tref->set_is_lvalue(); - Statement* s = Statement::make_assignment_operation(OPERATOR_PLUSEQ, - tref, call, bloc); - gogo->add_statement(s); - } - - // Return retval to the caller of the hash function. - Expression_list* vals = new Expression_list(); - ref = Expression::make_temporary_reference(retval, bloc); - vals->push_back(ref); - Statement* s = Statement::make_return_statement(vals, bloc); - gogo->add_statement(s); -} - -// Write the equality function for a struct which can not use the -// identity function. - -void -Struct_type::write_equal_function(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - // The pointers to the structs we are going to compare. - Named_object* key1_arg = gogo->lookup("key1", NULL); - Named_object* key2_arg = gogo->lookup("key2", NULL); - go_assert(key1_arg != NULL && key2_arg != NULL); - - // Build temporaries with the right types. - Type* pt = Type::make_pointer_type(name != NULL - ? static_cast<Type*>(name) - : static_cast<Type*>(this)); - - Expression* ref = Expression::make_var_reference(key1_arg, bloc); - ref = Expression::make_unsafe_cast(pt, ref, bloc); - Temporary_statement* p1 = Statement::make_temporary(pt, ref, bloc); - gogo->add_statement(p1); - - ref = Expression::make_var_reference(key2_arg, bloc); - ref = Expression::make_unsafe_cast(pt, ref, bloc); - Temporary_statement* p2 = Statement::make_temporary(pt, ref, bloc); - gogo->add_statement(p2); - - const Struct_field_list* fields = this->fields_; - unsigned int field_index = 0; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf, ++field_index) - { - if (Gogo::is_sink_name(pf->field_name())) - continue; - - // Compare one field in both P1 and P2. - Expression* f1 = Expression::make_temporary_reference(p1, bloc); - f1 = Expression::make_unary(OPERATOR_MULT, f1, bloc); - f1 = Expression::make_field_reference(f1, field_index, bloc); - - Expression* f2 = Expression::make_temporary_reference(p2, bloc); - f2 = Expression::make_unary(OPERATOR_MULT, f2, bloc); - f2 = Expression::make_field_reference(f2, field_index, bloc); - - Expression* cond = Expression::make_binary(OPERATOR_NOTEQ, f1, f2, bloc); - - // If the values are not equal, return false. - gogo->start_block(bloc); - Expression_list* vals = new Expression_list(); - vals->push_back(Expression::make_boolean(false, bloc)); - Statement* s = Statement::make_return_statement(vals, bloc); - gogo->add_statement(s); - Block* then_block = gogo->finish_block(bloc); - - s = Statement::make_if_statement(cond, then_block, NULL, bloc); - gogo->add_statement(s); - } - - // All the fields are equal, so return true. - Expression_list* vals = new Expression_list(); - vals->push_back(Expression::make_boolean(true, bloc)); - Statement* s = Statement::make_return_statement(vals, bloc); - gogo->add_statement(s); -} - -// Reflection string. - -void -Struct_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - ret->append("struct {"); - - for (Struct_field_list::const_iterator p = this->fields_->begin(); - p != this->fields_->end(); - ++p) - { - if (p != this->fields_->begin()) - ret->push_back(';'); - ret->push_back(' '); - if (p->is_anonymous()) - ret->push_back('?'); - else - ret->append(Gogo::unpack_hidden_name(p->field_name())); - ret->push_back(' '); - this->append_reflection(p->type(), gogo, ret); - - if (p->has_tag()) - { - const std::string& tag(p->tag()); - ret->append(" \""); - for (std::string::const_iterator p = tag.begin(); - p != tag.end(); - ++p) - { - if (*p == '\0') - ret->append("\\x00"); - else if (*p == '\n') - ret->append("\\n"); - else if (*p == '\t') - ret->append("\\t"); - else if (*p == '"') - ret->append("\\\""); - else if (*p == '\\') - ret->append("\\\\"); - else - ret->push_back(*p); - } - ret->push_back('"'); - } - } - - if (!this->fields_->empty()) - ret->push_back(' '); - - ret->push_back('}'); -} - -// Mangled name. - -void -Struct_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - ret->push_back('S'); - - const Struct_field_list* fields = this->fields_; - if (fields != NULL) - { - for (Struct_field_list::const_iterator p = fields->begin(); - p != fields->end(); - ++p) - { - if (p->is_anonymous()) - ret->append("0_"); - else - { - std::string n = Gogo::unpack_hidden_name(p->field_name()); - char buf[20]; - snprintf(buf, sizeof buf, "%u_", - static_cast<unsigned int>(n.length())); - ret->append(buf); - ret->append(n); - } - this->append_mangled_name(p->type(), gogo, ret); - if (p->has_tag()) - { - const std::string& tag(p->tag()); - std::string out; - for (std::string::const_iterator p = tag.begin(); - p != tag.end(); - ++p) - { - if (ISALNUM(*p) || *p == '_') - out.push_back(*p); - else - { - char buf[20]; - snprintf(buf, sizeof buf, ".%x.", - static_cast<unsigned int>(*p)); - out.append(buf); - } - } - char buf[20]; - snprintf(buf, sizeof buf, "T%u_", - static_cast<unsigned int>(out.length())); - ret->append(buf); - ret->append(out); - } - } - } - - ret->push_back('e'); -} - -// If the offset of field INDEX in the backend implementation can be -// determined, set *POFFSET to the offset in bytes and return true. -// Otherwise, return false. - -bool -Struct_type::backend_field_offset(Gogo* gogo, unsigned int index, - unsigned int* poffset) -{ - if (!this->is_backend_type_size_known(gogo)) - return false; - Btype* bt = this->get_backend_placeholder(gogo); - size_t offset = gogo->backend()->type_field_offset(bt, index); - *poffset = static_cast<unsigned int>(offset); - if (*poffset != offset) - return false; - return true; -} - -// Export. - -void -Struct_type::do_export(Export* exp) const -{ - exp->write_c_string("struct { "); - const Struct_field_list* fields = this->fields_; - go_assert(fields != NULL); - for (Struct_field_list::const_iterator p = fields->begin(); - p != fields->end(); - ++p) - { - if (p->is_anonymous()) - exp->write_string("? "); - else - { - exp->write_string(p->field_name()); - exp->write_c_string(" "); - } - exp->write_type(p->type()); - - if (p->has_tag()) - { - exp->write_c_string(" "); - Expression* expr = - Expression::make_string(p->tag(), Linemap::predeclared_location()); - expr->export_expression(exp); - delete expr; - } - - exp->write_c_string("; "); - } - exp->write_c_string("}"); -} - -// Import. - -Struct_type* -Struct_type::do_import(Import* imp) -{ - imp->require_c_string("struct { "); - Struct_field_list* fields = new Struct_field_list; - if (imp->peek_char() != '}') - { - while (true) - { - std::string name; - if (imp->match_c_string("? ")) - imp->advance(2); - else - { - name = imp->read_identifier(); - imp->require_c_string(" "); - } - Type* ftype = imp->read_type(); - - Struct_field sf(Typed_identifier(name, ftype, imp->location())); - - if (imp->peek_char() == ' ') - { - imp->advance(1); - Expression* expr = Expression::import_expression(imp); - String_expression* sexpr = expr->string_expression(); - go_assert(sexpr != NULL); - sf.set_tag(sexpr->val()); - delete sexpr; - } - - imp->require_c_string("; "); - fields->push_back(sf); - if (imp->peek_char() == '}') - break; - } - } - imp->require_c_string("}"); - - return Type::make_struct_type(fields, imp->location()); -} - -// Make a struct type. - -Struct_type* -Type::make_struct_type(Struct_field_list* fields, - Location location) -{ - return new Struct_type(fields, location); -} - -// Class Array_type. - -// Whether two array types are identical. - -bool -Array_type::is_identical(const Array_type* t, bool errors_are_identical) const -{ - if (!Type::are_identical(this->element_type(), t->element_type(), - errors_are_identical, NULL)) - return false; - - Expression* l1 = this->length(); - Expression* l2 = t->length(); - - // Slices of the same element type are identical. - if (l1 == NULL && l2 == NULL) - return true; - - // Arrays of the same element type are identical if they have the - // same length. - if (l1 != NULL && l2 != NULL) - { - if (l1 == l2) - return true; - - // Try to determine the lengths. If we can't, assume the arrays - // are not identical. - bool ret = false; - Numeric_constant nc1, nc2; - if (l1->numeric_constant_value(&nc1) - && l2->numeric_constant_value(&nc2)) - { - mpz_t v1; - if (nc1.to_int(&v1)) - { - mpz_t v2; - if (nc2.to_int(&v2)) - { - ret = mpz_cmp(v1, v2) == 0; - mpz_clear(v2); - } - mpz_clear(v1); - } - } - return ret; - } - - // Otherwise the arrays are not identical. - return false; -} - -// Traversal. - -int -Array_type::do_traverse(Traverse* traverse) -{ - if (Type::traverse(this->element_type_, traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - if (this->length_ != NULL - && Expression::traverse(&this->length_, traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - return TRAVERSE_CONTINUE; -} - -// Check that the length is valid. - -bool -Array_type::verify_length() -{ - if (this->length_ == NULL) - return true; - - Type_context context(Type::lookup_integer_type("int"), false); - this->length_->determine_type(&context); - - if (!this->length_->is_constant()) - { - error_at(this->length_->location(), "array bound is not constant"); - return false; - } - - Numeric_constant nc; - if (!this->length_->numeric_constant_value(&nc)) - { - if (this->length_->type()->integer_type() != NULL - || this->length_->type()->float_type() != NULL) - error_at(this->length_->location(), "array bound is not constant"); - else - error_at(this->length_->location(), "array bound is not numeric"); - return false; - } - - unsigned long val; - switch (nc.to_unsigned_long(&val)) - { - case Numeric_constant::NC_UL_VALID: - break; - case Numeric_constant::NC_UL_NOTINT: - error_at(this->length_->location(), "array bound truncated to integer"); - return false; - case Numeric_constant::NC_UL_NEGATIVE: - error_at(this->length_->location(), "negative array bound"); - return false; - case Numeric_constant::NC_UL_BIG: - error_at(this->length_->location(), "array bound overflows"); - return false; - default: - go_unreachable(); - } - - Type* int_type = Type::lookup_integer_type("int"); - unsigned int tbits = int_type->integer_type()->bits(); - if (sizeof(val) <= tbits * 8 - && val >> (tbits - 1) != 0) - { - error_at(this->length_->location(), "array bound overflows"); - return false; - } - - return true; -} - -// Verify the type. - -bool -Array_type::do_verify() -{ - if (!this->verify_length()) - this->length_ = Expression::make_error(this->length_->location()); - return true; -} - -// Whether we can use memcmp to compare this array. - -bool -Array_type::do_compare_is_identity(Gogo* gogo) -{ - if (this->length_ == NULL) - return false; - - // Check for [...], which indicates that this is not a real type. - if (this->length_->is_nil_expression()) - return false; - - if (!this->element_type_->compare_is_identity(gogo)) - return false; - - // If there is any padding, then we can't use memcmp. - unsigned int size; - unsigned int align; - if (!this->element_type_->backend_type_size(gogo, &size) - || !this->element_type_->backend_type_align(gogo, &align)) - return false; - if ((size & (align - 1)) != 0) - return false; - - return true; -} - -// Array type hash code. - -unsigned int -Array_type::do_hash_for_method(Gogo* gogo) const -{ - // There is no very convenient way to get a hash code for the - // length. - return this->element_type_->hash_for_method(gogo) + 1; -} - -// Write the hash function for an array which can not use the identify -// function. - -void -Array_type::write_hash_function(Gogo* gogo, Named_type* name, - Function_type* hash_fntype, - Function_type* equal_fntype) -{ - Location bloc = Linemap::predeclared_location(); - - // The pointer to the array that we are going to hash. This is an - // argument to the hash function we are implementing here. - Named_object* key_arg = gogo->lookup("key", NULL); - go_assert(key_arg != NULL); - Type* key_arg_type = key_arg->var_value()->type(); - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - - // Get a 0. - mpz_t ival; - mpz_init_set_ui(ival, 0); - Expression* zero = Expression::make_integer(&ival, uintptr_type, bloc); - mpz_clear(ival); - - // Make a temporary to hold the return value, initialized to 0. - Temporary_statement* retval = Statement::make_temporary(uintptr_type, zero, - bloc); - gogo->add_statement(retval); - - // Make a temporary to hold the key as a uintptr. - Expression* ref = Expression::make_var_reference(key_arg, bloc); - ref = Expression::make_cast(uintptr_type, ref, bloc); - Temporary_statement* key = Statement::make_temporary(uintptr_type, ref, - bloc); - gogo->add_statement(key); - - // Loop over the array elements. - // for i = range a - Type* int_type = Type::lookup_integer_type("int"); - Temporary_statement* index = Statement::make_temporary(int_type, NULL, bloc); - gogo->add_statement(index); - - Expression* iref = Expression::make_temporary_reference(index, bloc); - Expression* aref = Expression::make_var_reference(key_arg, bloc); - Type* pt = Type::make_pointer_type(name != NULL - ? static_cast<Type*>(name) - : static_cast<Type*>(this)); - aref = Expression::make_cast(pt, aref, bloc); - For_range_statement* for_range = Statement::make_for_range_statement(iref, - NULL, - aref, - bloc); - - gogo->start_block(bloc); - - // Multiply retval by 33. - mpz_init_set_ui(ival, 33); - Expression* i33 = Expression::make_integer(&ival, uintptr_type, bloc); - mpz_clear(ival); - - ref = Expression::make_temporary_reference(retval, bloc); - Statement* s = Statement::make_assignment_operation(OPERATOR_MULTEQ, ref, - i33, bloc); - gogo->add_statement(s); - - // Get the hash function for the element type. - Named_object* hash_fn; - Named_object* equal_fn; - this->element_type_->type_functions(gogo, this->element_type_->named_type(), - hash_fntype, equal_fntype, &hash_fn, - &equal_fn); - - // Get a pointer to this element in the loop. - Expression* subkey = Expression::make_temporary_reference(key, bloc); - subkey = Expression::make_cast(key_arg_type, subkey, bloc); - - // Get the size of each element. - Expression* ele_size = Expression::make_type_info(this->element_type_, - Expression::TYPE_INFO_SIZE); - - // Get the hash of this element. - Expression_list* args = new Expression_list(); - args->push_back(subkey); - args->push_back(ele_size); - Expression* func = Expression::make_func_reference(hash_fn, NULL, bloc); - Expression* call = Expression::make_call(func, args, false, bloc); - - // Add the element's hash value to retval. - Temporary_reference_expression* tref = - Expression::make_temporary_reference(retval, bloc); - tref->set_is_lvalue(); - s = Statement::make_assignment_operation(OPERATOR_PLUSEQ, tref, call, bloc); - gogo->add_statement(s); - - // Increase the element pointer. - tref = Expression::make_temporary_reference(key, bloc); - tref->set_is_lvalue(); - s = Statement::make_assignment_operation(OPERATOR_PLUSEQ, tref, ele_size, - bloc); - - Block* statements = gogo->finish_block(bloc); - - for_range->add_statements(statements); - gogo->add_statement(for_range); - - // Return retval to the caller of the hash function. - Expression_list* vals = new Expression_list(); - ref = Expression::make_temporary_reference(retval, bloc); - vals->push_back(ref); - s = Statement::make_return_statement(vals, bloc); - gogo->add_statement(s); -} - -// Write the equality function for an array which can not use the -// identity function. - -void -Array_type::write_equal_function(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - // The pointers to the arrays we are going to compare. - Named_object* key1_arg = gogo->lookup("key1", NULL); - Named_object* key2_arg = gogo->lookup("key2", NULL); - go_assert(key1_arg != NULL && key2_arg != NULL); - - // Build temporaries for the keys with the right types. - Type* pt = Type::make_pointer_type(name != NULL - ? static_cast<Type*>(name) - : static_cast<Type*>(this)); - - Expression* ref = Expression::make_var_reference(key1_arg, bloc); - ref = Expression::make_unsafe_cast(pt, ref, bloc); - Temporary_statement* p1 = Statement::make_temporary(pt, ref, bloc); - gogo->add_statement(p1); - - ref = Expression::make_var_reference(key2_arg, bloc); - ref = Expression::make_unsafe_cast(pt, ref, bloc); - Temporary_statement* p2 = Statement::make_temporary(pt, ref, bloc); - gogo->add_statement(p2); - - // Loop over the array elements. - // for i = range a - Type* int_type = Type::lookup_integer_type("int"); - Temporary_statement* index = Statement::make_temporary(int_type, NULL, bloc); - gogo->add_statement(index); - - Expression* iref = Expression::make_temporary_reference(index, bloc); - Expression* aref = Expression::make_temporary_reference(p1, bloc); - For_range_statement* for_range = Statement::make_for_range_statement(iref, - NULL, - aref, - bloc); - - gogo->start_block(bloc); - - // Compare element in P1 and P2. - Expression* e1 = Expression::make_temporary_reference(p1, bloc); - e1 = Expression::make_unary(OPERATOR_MULT, e1, bloc); - ref = Expression::make_temporary_reference(index, bloc); - e1 = Expression::make_array_index(e1, ref, NULL, bloc); - - Expression* e2 = Expression::make_temporary_reference(p2, bloc); - e2 = Expression::make_unary(OPERATOR_MULT, e2, bloc); - ref = Expression::make_temporary_reference(index, bloc); - e2 = Expression::make_array_index(e2, ref, NULL, bloc); - - Expression* cond = Expression::make_binary(OPERATOR_NOTEQ, e1, e2, bloc); - - // If the elements are not equal, return false. - gogo->start_block(bloc); - Expression_list* vals = new Expression_list(); - vals->push_back(Expression::make_boolean(false, bloc)); - Statement* s = Statement::make_return_statement(vals, bloc); - gogo->add_statement(s); - Block* then_block = gogo->finish_block(bloc); - - s = Statement::make_if_statement(cond, then_block, NULL, bloc); - gogo->add_statement(s); - - Block* statements = gogo->finish_block(bloc); - - for_range->add_statements(statements); - gogo->add_statement(for_range); - - // All the elements are equal, so return true. - vals = new Expression_list(); - vals->push_back(Expression::make_boolean(true, bloc)); - s = Statement::make_return_statement(vals, bloc); - gogo->add_statement(s); -} - -// Get a tree for the length of a fixed array. The length may be -// computed using a function call, so we must only evaluate it once. - -tree -Array_type::get_length_tree(Gogo* gogo) -{ - go_assert(this->length_ != NULL); - if (this->length_tree_ == NULL_TREE) - { - Numeric_constant nc; - mpz_t val; - if (this->length_->numeric_constant_value(&nc) && nc.to_int(&val)) - { - if (mpz_sgn(val) < 0) - { - this->length_tree_ = error_mark_node; - return this->length_tree_; - } - Type* t = nc.type(); - if (t == NULL) - t = Type::lookup_integer_type("int"); - else if (t->is_abstract()) - t = t->make_non_abstract_type(); - tree tt = type_to_tree(t->get_backend(gogo)); - this->length_tree_ = Expression::integer_constant_tree(val, tt); - mpz_clear(val); - } - else - { - // Make up a translation context for the array length - // expression. FIXME: This won't work in general. - Translate_context context(gogo, NULL, NULL, NULL); - tree len = this->length_->get_tree(&context); - if (len != error_mark_node) - { - Type* int_type = Type::lookup_integer_type("int"); - tree int_type_tree = type_to_tree(int_type->get_backend(gogo)); - len = convert_to_integer(int_type_tree, len); - len = save_expr(len); - } - this->length_tree_ = len; - } - } - return this->length_tree_; -} - -// Get the backend representation of the fields of a slice. This is -// not declared in types.h so that types.h doesn't have to #include -// backend.h. -// -// We use int for the count and capacity fields. This matches 6g. -// The language more or less assumes that we can't allocate space of a -// size which does not fit in int. - -static void -get_backend_slice_fields(Gogo* gogo, Array_type* type, bool use_placeholder, - std::vector<Backend::Btyped_identifier>* bfields) -{ - bfields->resize(3); - - Type* pet = Type::make_pointer_type(type->element_type()); - Btype* pbet = (use_placeholder - ? pet->get_backend_placeholder(gogo) - : pet->get_backend(gogo)); - Location ploc = Linemap::predeclared_location(); - - Backend::Btyped_identifier* p = &(*bfields)[0]; - p->name = "__values"; - p->btype = pbet; - p->location = ploc; - - Type* int_type = Type::lookup_integer_type("int"); - - p = &(*bfields)[1]; - p->name = "__count"; - p->btype = int_type->get_backend(gogo); - p->location = ploc; - - p = &(*bfields)[2]; - p->name = "__capacity"; - p->btype = int_type->get_backend(gogo); - p->location = ploc; -} - -// Get a tree for the type of this array. A fixed array is simply -// represented as ARRAY_TYPE with the appropriate index--i.e., it is -// just like an array in C. An open array is a struct with three -// fields: a data pointer, the length, and the capacity. - -Btype* -Array_type::do_get_backend(Gogo* gogo) -{ - if (this->length_ == NULL) - { - std::vector<Backend::Btyped_identifier> bfields; - get_backend_slice_fields(gogo, this, false, &bfields); - return gogo->backend()->struct_type(bfields); - } - else - { - Btype* element = this->get_backend_element(gogo, false); - Bexpression* len = this->get_backend_length(gogo); - return gogo->backend()->array_type(element, len); - } -} - -// Return the backend representation of the element type. - -Btype* -Array_type::get_backend_element(Gogo* gogo, bool use_placeholder) -{ - if (use_placeholder) - return this->element_type_->get_backend_placeholder(gogo); - else - return this->element_type_->get_backend(gogo); -} - -// Return the backend representation of the length. - -Bexpression* -Array_type::get_backend_length(Gogo* gogo) -{ - return tree_to_expr(this->get_length_tree(gogo)); -} - -// Finish backend representation of the array. - -void -Array_type::finish_backend_element(Gogo* gogo) -{ - Type* et = this->array_type()->element_type(); - et->get_backend(gogo); - if (this->is_slice_type()) - { - // This relies on the fact that we always use the same - // structure for a pointer to any given type. - Type* pet = Type::make_pointer_type(et); - pet->get_backend(gogo); - } -} - -// Return a tree for a pointer to the values in ARRAY. - -tree -Array_type::value_pointer_tree(Gogo*, tree array) const -{ - tree ret; - if (this->length() != NULL) - { - // Fixed array. - ret = fold_convert(build_pointer_type(TREE_TYPE(TREE_TYPE(array))), - build_fold_addr_expr(array)); - } - else - { - // Open array. - tree field = TYPE_FIELDS(TREE_TYPE(array)); - go_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), - "__values") == 0); - ret = fold_build3(COMPONENT_REF, TREE_TYPE(field), array, field, - NULL_TREE); - } - if (TREE_CONSTANT(array)) - TREE_CONSTANT(ret) = 1; - return ret; -} - -// Return a tree for the length of the array ARRAY which has this -// type. - -tree -Array_type::length_tree(Gogo* gogo, tree array) -{ - if (this->length_ != NULL) - { - if (TREE_CODE(array) == SAVE_EXPR) - return this->get_length_tree(gogo); - else - { - tree len = this->get_length_tree(gogo); - return omit_one_operand(TREE_TYPE(len), len, array); - } - } - - // This is an open array. We need to read the length field. - - tree type = TREE_TYPE(array); - go_assert(TREE_CODE(type) == RECORD_TYPE); - - tree field = DECL_CHAIN(TYPE_FIELDS(type)); - go_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__count") == 0); - - tree ret = build3(COMPONENT_REF, TREE_TYPE(field), array, field, NULL_TREE); - if (TREE_CONSTANT(array)) - TREE_CONSTANT(ret) = 1; - return ret; -} - -// Return a tree for the capacity of the array ARRAY which has this -// type. - -tree -Array_type::capacity_tree(Gogo* gogo, tree array) -{ - if (this->length_ != NULL) - { - tree len = this->get_length_tree(gogo); - return omit_one_operand(TREE_TYPE(len), len, array); - } - - // This is an open array. We need to read the capacity field. - - tree type = TREE_TYPE(array); - go_assert(TREE_CODE(type) == RECORD_TYPE); - - tree field = DECL_CHAIN(DECL_CHAIN(TYPE_FIELDS(type))); - go_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__capacity") == 0); - - return build3(COMPONENT_REF, TREE_TYPE(field), array, field, NULL_TREE); -} - -// Export. - -void -Array_type::do_export(Export* exp) const -{ - exp->write_c_string("["); - if (this->length_ != NULL) - this->length_->export_expression(exp); - exp->write_c_string("] "); - exp->write_type(this->element_type_); -} - -// Import. - -Array_type* -Array_type::do_import(Import* imp) -{ - imp->require_c_string("["); - Expression* length; - if (imp->peek_char() == ']') - length = NULL; - else - length = Expression::import_expression(imp); - imp->require_c_string("] "); - Type* element_type = imp->read_type(); - return Type::make_array_type(element_type, length); -} - -// The type of an array type descriptor. - -Type* -Array_type::make_array_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - - Struct_type* sf = - Type::make_builtin_struct_type(4, - "", tdt, - "elem", ptdt, - "slice", ptdt, - "len", uintptr_type); - - ret = Type::make_builtin_named_type("ArrayType", sf); - } - - return ret; -} - -// The type of an slice type descriptor. - -Type* -Array_type::make_slice_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Struct_type* sf = - Type::make_builtin_struct_type(2, - "", tdt, - "elem", ptdt); - - ret = Type::make_builtin_named_type("SliceType", sf); - } - - return ret; -} - -// Build a type descriptor for an array/slice type. - -Expression* -Array_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - if (this->length_ != NULL) - return this->array_type_descriptor(gogo, name); - else - return this->slice_type_descriptor(gogo, name); -} - -// Build a type descriptor for an array type. - -Expression* -Array_type::array_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* atdt = Array_type::make_array_type_descriptor_type(); - - const Struct_field_list* fields = atdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(3); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_ARRAY, - name, NULL, true)); - - ++p; - go_assert(p->is_field_name("elem")); - vals->push_back(Expression::make_type_descriptor(this->element_type_, bloc)); - - ++p; - go_assert(p->is_field_name("slice")); - Type* slice_type = Type::make_array_type(this->element_type_, NULL); - vals->push_back(Expression::make_type_descriptor(slice_type, bloc)); - - ++p; - go_assert(p->is_field_name("len")); - vals->push_back(Expression::make_cast(p->type(), this->length_, bloc)); - - ++p; - go_assert(p == fields->end()); - - return Expression::make_struct_composite_literal(atdt, vals, bloc); -} - -// Build a type descriptor for a slice type. - -Expression* -Array_type::slice_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* stdt = Array_type::make_slice_type_descriptor_type(); - - const Struct_field_list* fields = stdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(2); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_SLICE, - name, NULL, true)); - - ++p; - go_assert(p->is_field_name("elem")); - vals->push_back(Expression::make_type_descriptor(this->element_type_, bloc)); - - ++p; - go_assert(p == fields->end()); - - return Expression::make_struct_composite_literal(stdt, vals, bloc); -} - -// Reflection string. - -void -Array_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - ret->push_back('['); - if (this->length_ != NULL) - { - Numeric_constant nc; - unsigned long val; - if (!this->length_->numeric_constant_value(&nc) - || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) - error_at(this->length_->location(), "invalid array length"); - else - { - char buf[50]; - snprintf(buf, sizeof buf, "%lu", val); - ret->append(buf); - } - } - ret->push_back(']'); - - this->append_reflection(this->element_type_, gogo, ret); -} - -// Mangled name. - -void -Array_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - ret->push_back('A'); - this->append_mangled_name(this->element_type_, gogo, ret); - if (this->length_ != NULL) - { - Numeric_constant nc; - unsigned long val; - if (!this->length_->numeric_constant_value(&nc) - || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) - error_at(this->length_->location(), "invalid array length"); - else - { - char buf[50]; - snprintf(buf, sizeof buf, "%lu", val); - ret->append(buf); - } - } - ret->push_back('e'); -} - -// Make an array type. - -Array_type* -Type::make_array_type(Type* element_type, Expression* length) -{ - return new Array_type(element_type, length); -} - -// Class Map_type. - -// Traversal. - -int -Map_type::do_traverse(Traverse* traverse) -{ - if (Type::traverse(this->key_type_, traverse) == TRAVERSE_EXIT - || Type::traverse(this->val_type_, traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - return TRAVERSE_CONTINUE; -} - -// Check that the map type is OK. - -bool -Map_type::do_verify() -{ - // The runtime support uses "map[void]void". - if (!this->key_type_->is_comparable() && !this->key_type_->is_void_type()) - error_at(this->location_, "invalid map key type"); - return true; -} - -// Whether two map types are identical. - -bool -Map_type::is_identical(const Map_type* t, bool errors_are_identical) const -{ - return (Type::are_identical(this->key_type(), t->key_type(), - errors_are_identical, NULL) - && Type::are_identical(this->val_type(), t->val_type(), - errors_are_identical, NULL)); -} - -// Hash code. - -unsigned int -Map_type::do_hash_for_method(Gogo* gogo) const -{ - return (this->key_type_->hash_for_method(gogo) - + this->val_type_->hash_for_method(gogo) - + 2); -} - -// Get the backend representation for a map type. A map type is -// represented as a pointer to a struct. The struct is __go_map in -// libgo/map.h. - -Btype* -Map_type::do_get_backend(Gogo* gogo) -{ - static Btype* backend_map_type; - if (backend_map_type == NULL) - { - std::vector<Backend::Btyped_identifier> bfields(4); - - Location bloc = Linemap::predeclared_location(); - - Type* pdt = Type::make_type_descriptor_ptr_type(); - bfields[0].name = "__descriptor"; - bfields[0].btype = pdt->get_backend(gogo); - bfields[0].location = bloc; - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - bfields[1].name = "__element_count"; - bfields[1].btype = uintptr_type->get_backend(gogo); - bfields[1].location = bloc; - - bfields[2].name = "__bucket_count"; - bfields[2].btype = bfields[1].btype; - bfields[2].location = bloc; - - Btype* bvt = gogo->backend()->void_type(); - Btype* bpvt = gogo->backend()->pointer_type(bvt); - Btype* bppvt = gogo->backend()->pointer_type(bpvt); - bfields[3].name = "__buckets"; - bfields[3].btype = bppvt; - bfields[3].location = bloc; - - Btype *bt = gogo->backend()->struct_type(bfields); - bt = gogo->backend()->named_type("__go_map", bt, bloc); - backend_map_type = gogo->backend()->pointer_type(bt); - } - return backend_map_type; -} - -// The type of a map type descriptor. - -Type* -Map_type::make_map_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Struct_type* sf = - Type::make_builtin_struct_type(3, - "", tdt, - "key", ptdt, - "elem", ptdt); - - ret = Type::make_builtin_named_type("MapType", sf); - } - - return ret; -} - -// Build a type descriptor for a map type. - -Expression* -Map_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* mtdt = Map_type::make_map_type_descriptor_type(); - - const Struct_field_list* fields = mtdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(3); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_MAP, - name, NULL, true)); - - ++p; - go_assert(p->is_field_name("key")); - vals->push_back(Expression::make_type_descriptor(this->key_type_, bloc)); - - ++p; - go_assert(p->is_field_name("elem")); - vals->push_back(Expression::make_type_descriptor(this->val_type_, bloc)); - - ++p; - go_assert(p == fields->end()); - - return Expression::make_struct_composite_literal(mtdt, vals, bloc); -} - -// A mapping from map types to map descriptors. - -Map_type::Map_descriptors Map_type::map_descriptors; - -// Build a map descriptor for this type. Return a pointer to it. - -tree -Map_type::map_descriptor_pointer(Gogo* gogo, Location location) -{ - Bvariable* bvar = this->map_descriptor(gogo); - tree var_tree = var_to_tree(bvar); - if (var_tree == error_mark_node) - return error_mark_node; - return build_fold_addr_expr_loc(location.gcc_location(), var_tree); -} - -// Build a map descriptor for this type. - -Bvariable* -Map_type::map_descriptor(Gogo* gogo) -{ - std::pair<Map_type*, Bvariable*> val(this, NULL); - std::pair<Map_type::Map_descriptors::iterator, bool> ins = - Map_type::map_descriptors.insert(val); - if (!ins.second) - return ins.first->second; - - Type* key_type = this->key_type_; - Type* val_type = this->val_type_; - - // The map entry type is a struct with three fields. Build that - // struct so that we can get the offsets of the key and value within - // a map entry. The first field should technically be a pointer to - // this type itself, but since we only care about field offsets we - // just use pointer to bool. - Type* pbool = Type::make_pointer_type(Type::make_boolean_type()); - Struct_type* map_entry_type = - Type::make_builtin_struct_type(3, - "__next", pbool, - "__key", key_type, - "__val", val_type); - - Type* map_descriptor_type = Map_type::make_map_descriptor_type(); - - const Struct_field_list* fields = - map_descriptor_type->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(4); - - Location bloc = Linemap::predeclared_location(); - - Struct_field_list::const_iterator p = fields->begin(); - - go_assert(p->is_field_name("__map_descriptor")); - vals->push_back(Expression::make_type_descriptor(this, bloc)); - - ++p; - go_assert(p->is_field_name("__entry_size")); - Expression::Type_info type_info = Expression::TYPE_INFO_SIZE; - vals->push_back(Expression::make_type_info(map_entry_type, type_info)); - - Struct_field_list::const_iterator pf = map_entry_type->fields()->begin(); - ++pf; - go_assert(pf->is_field_name("__key")); - - ++p; - go_assert(p->is_field_name("__key_offset")); - vals->push_back(Expression::make_struct_field_offset(map_entry_type, &*pf)); - - ++pf; - go_assert(pf->is_field_name("__val")); - - ++p; - go_assert(p->is_field_name("__val_offset")); - vals->push_back(Expression::make_struct_field_offset(map_entry_type, &*pf)); - - ++p; - go_assert(p == fields->end()); - - Expression* initializer = - Expression::make_struct_composite_literal(map_descriptor_type, vals, bloc); - - std::string mangled_name = "__go_map_" + this->mangled_name(gogo); - Btype* map_descriptor_btype = map_descriptor_type->get_backend(gogo); - Bvariable* bvar = gogo->backend()->immutable_struct(mangled_name, true, - map_descriptor_btype, - bloc); - - Translate_context context(gogo, NULL, NULL, NULL); - context.set_is_const(); - Bexpression* binitializer = tree_to_expr(initializer->get_tree(&context)); - - gogo->backend()->immutable_struct_set_init(bvar, mangled_name, true, - map_descriptor_btype, bloc, - binitializer); - - ins.first->second = bvar; - return bvar; -} - -// Build the type of a map descriptor. This must match the struct -// __go_map_descriptor in libgo/runtime/map.h. - -Type* -Map_type::make_map_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* ptdt = Type::make_type_descriptor_ptr_type(); - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - Struct_type* sf = - Type::make_builtin_struct_type(4, - "__map_descriptor", ptdt, - "__entry_size", uintptr_type, - "__key_offset", uintptr_type, - "__val_offset", uintptr_type); - ret = Type::make_builtin_named_type("__go_map_descriptor", sf); - } - return ret; -} - -// Reflection string for a map. - -void -Map_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - ret->append("map["); - this->append_reflection(this->key_type_, gogo, ret); - ret->append("]"); - this->append_reflection(this->val_type_, gogo, ret); -} - -// Mangled name for a map. - -void -Map_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - ret->push_back('M'); - this->append_mangled_name(this->key_type_, gogo, ret); - ret->append("__"); - this->append_mangled_name(this->val_type_, gogo, ret); -} - -// Export a map type. - -void -Map_type::do_export(Export* exp) const -{ - exp->write_c_string("map ["); - exp->write_type(this->key_type_); - exp->write_c_string("] "); - exp->write_type(this->val_type_); -} - -// Import a map type. - -Map_type* -Map_type::do_import(Import* imp) -{ - imp->require_c_string("map ["); - Type* key_type = imp->read_type(); - imp->require_c_string("] "); - Type* val_type = imp->read_type(); - return Type::make_map_type(key_type, val_type, imp->location()); -} - -// Make a map type. - -Map_type* -Type::make_map_type(Type* key_type, Type* val_type, Location location) -{ - return new Map_type(key_type, val_type, location); -} - -// Class Channel_type. - -// Hash code. - -unsigned int -Channel_type::do_hash_for_method(Gogo* gogo) const -{ - unsigned int ret = 0; - if (this->may_send_) - ret += 1; - if (this->may_receive_) - ret += 2; - if (this->element_type_ != NULL) - ret += this->element_type_->hash_for_method(gogo) << 2; - return ret << 3; -} - -// Whether this type is the same as T. - -bool -Channel_type::is_identical(const Channel_type* t, - bool errors_are_identical) const -{ - if (!Type::are_identical(this->element_type(), t->element_type(), - errors_are_identical, NULL)) - return false; - return (this->may_send_ == t->may_send_ - && this->may_receive_ == t->may_receive_); -} - -// Return the tree for a channel type. A channel is a pointer to a -// __go_channel struct. The __go_channel struct is defined in -// libgo/runtime/channel.h. - -Btype* -Channel_type::do_get_backend(Gogo* gogo) -{ - static Btype* backend_channel_type; - if (backend_channel_type == NULL) - { - std::vector<Backend::Btyped_identifier> bfields; - Btype* bt = gogo->backend()->struct_type(bfields); - bt = gogo->backend()->named_type("__go_channel", bt, - Linemap::predeclared_location()); - backend_channel_type = gogo->backend()->pointer_type(bt); - } - return backend_channel_type; -} - -// Build a type descriptor for a channel type. - -Type* -Channel_type::make_chan_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Type* uintptr_type = Type::lookup_integer_type("uintptr"); - - Struct_type* sf = - Type::make_builtin_struct_type(3, - "", tdt, - "elem", ptdt, - "dir", uintptr_type); - - ret = Type::make_builtin_named_type("ChanType", sf); - } - - return ret; -} - -// Build a type descriptor for a map type. - -Expression* -Channel_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* ctdt = Channel_type::make_chan_type_descriptor_type(); - - const Struct_field_list* fields = ctdt->struct_type()->fields(); - - Expression_list* vals = new Expression_list(); - vals->reserve(3); - - Struct_field_list::const_iterator p = fields->begin(); - go_assert(p->is_field_name("commonType")); - vals->push_back(this->type_descriptor_constructor(gogo, - RUNTIME_TYPE_KIND_CHAN, - name, NULL, true)); - - ++p; - go_assert(p->is_field_name("elem")); - vals->push_back(Expression::make_type_descriptor(this->element_type_, bloc)); - - ++p; - go_assert(p->is_field_name("dir")); - // These bits must match the ones in libgo/runtime/go-type.h. - int val = 0; - if (this->may_receive_) - val |= 1; - if (this->may_send_) - val |= 2; - mpz_t iv; - mpz_init_set_ui(iv, val); - vals->push_back(Expression::make_integer(&iv, p->type(), bloc)); - mpz_clear(iv); - - ++p; - go_assert(p == fields->end()); - - return Expression::make_struct_composite_literal(ctdt, vals, bloc); -} - -// Reflection string. - -void -Channel_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - if (!this->may_send_) - ret->append("<-"); - ret->append("chan"); - if (!this->may_receive_) - ret->append("<-"); - ret->push_back(' '); - this->append_reflection(this->element_type_, gogo, ret); -} - -// Mangled name. - -void -Channel_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - ret->push_back('C'); - this->append_mangled_name(this->element_type_, gogo, ret); - if (this->may_send_) - ret->push_back('s'); - if (this->may_receive_) - ret->push_back('r'); - ret->push_back('e'); -} - -// Export. - -void -Channel_type::do_export(Export* exp) const -{ - exp->write_c_string("chan "); - if (this->may_send_ && !this->may_receive_) - exp->write_c_string("-< "); - else if (this->may_receive_ && !this->may_send_) - exp->write_c_string("<- "); - exp->write_type(this->element_type_); -} - -// Import. - -Channel_type* -Channel_type::do_import(Import* imp) -{ - imp->require_c_string("chan "); - - bool may_send; - bool may_receive; - if (imp->match_c_string("-< ")) - { - imp->advance(3); - may_send = true; - may_receive = false; - } - else if (imp->match_c_string("<- ")) - { - imp->advance(3); - may_receive = true; - may_send = false; - } - else - { - may_send = true; - may_receive = true; - } - - Type* element_type = imp->read_type(); - - return Type::make_channel_type(may_send, may_receive, element_type); -} - -// Make a new channel type. - -Channel_type* -Type::make_channel_type(bool send, bool receive, Type* element_type) -{ - return new Channel_type(send, receive, element_type); -} - -// Class Interface_type. - -// Return the list of methods. - -const Typed_identifier_list* -Interface_type::methods() const -{ - go_assert(this->methods_are_finalized_ || saw_errors()); - return this->all_methods_; -} - -// Return the number of methods. - -size_t -Interface_type::method_count() const -{ - go_assert(this->methods_are_finalized_ || saw_errors()); - return this->all_methods_ == NULL ? 0 : this->all_methods_->size(); -} - -// Traversal. - -int -Interface_type::do_traverse(Traverse* traverse) -{ - Typed_identifier_list* methods = (this->methods_are_finalized_ - ? this->all_methods_ - : this->parse_methods_); - if (methods == NULL) - return TRAVERSE_CONTINUE; - return methods->traverse(traverse); -} - -// Finalize the methods. This handles interface inheritance. - -void -Interface_type::finalize_methods() -{ - if (this->methods_are_finalized_) - return; - this->methods_are_finalized_ = true; - if (this->parse_methods_ == NULL) - return; - - this->all_methods_ = new Typed_identifier_list(); - this->all_methods_->reserve(this->parse_methods_->size()); - Typed_identifier_list inherit; - for (Typed_identifier_list::const_iterator pm = - this->parse_methods_->begin(); - pm != this->parse_methods_->end(); - ++pm) - { - const Typed_identifier* p = &*pm; - if (p->name().empty()) - inherit.push_back(*p); - else if (this->find_method(p->name()) == NULL) - this->all_methods_->push_back(*p); - else - error_at(p->location(), "duplicate method %qs", - Gogo::message_name(p->name()).c_str()); - } - - std::vector<Named_type*> seen; - seen.reserve(inherit.size()); - bool issued_recursive_error = false; - while (!inherit.empty()) - { - Type* t = inherit.back().type(); - Location tl = inherit.back().location(); - inherit.pop_back(); - - Interface_type* it = t->interface_type(); - if (it == NULL) - { - if (!t->is_error()) - error_at(tl, "interface contains embedded non-interface"); - continue; - } - if (it == this) - { - if (!issued_recursive_error) - { - error_at(tl, "invalid recursive interface"); - issued_recursive_error = true; - } - continue; - } - - Named_type* nt = t->named_type(); - if (nt != NULL && it->parse_methods_ != NULL) - { - std::vector<Named_type*>::const_iterator q; - for (q = seen.begin(); q != seen.end(); ++q) - { - if (*q == nt) - { - error_at(tl, "inherited interface loop"); - break; - } - } - if (q != seen.end()) - continue; - seen.push_back(nt); - } - - const Typed_identifier_list* imethods = it->parse_methods_; - if (imethods == NULL) - continue; - for (Typed_identifier_list::const_iterator q = imethods->begin(); - q != imethods->end(); - ++q) - { - if (q->name().empty()) - inherit.push_back(*q); - else if (this->find_method(q->name()) == NULL) - this->all_methods_->push_back(Typed_identifier(q->name(), - q->type(), tl)); - else - error_at(tl, "inherited method %qs is ambiguous", - Gogo::message_name(q->name()).c_str()); - } - } - - if (!this->all_methods_->empty()) - this->all_methods_->sort_by_name(); - else - { - delete this->all_methods_; - this->all_methods_ = NULL; - } -} - -// Return the method NAME, or NULL. - -const Typed_identifier* -Interface_type::find_method(const std::string& name) const -{ - go_assert(this->methods_are_finalized_); - if (this->all_methods_ == NULL) - return NULL; - for (Typed_identifier_list::const_iterator p = this->all_methods_->begin(); - p != this->all_methods_->end(); - ++p) - if (p->name() == name) - return &*p; - return NULL; -} - -// Return the method index. - -size_t -Interface_type::method_index(const std::string& name) const -{ - go_assert(this->methods_are_finalized_ && this->all_methods_ != NULL); - size_t ret = 0; - for (Typed_identifier_list::const_iterator p = this->all_methods_->begin(); - p != this->all_methods_->end(); - ++p, ++ret) - if (p->name() == name) - return ret; - go_unreachable(); -} - -// Return whether NAME is an unexported method, for better error -// reporting. - -bool -Interface_type::is_unexported_method(Gogo* gogo, const std::string& name) const -{ - go_assert(this->methods_are_finalized_); - if (this->all_methods_ == NULL) - return false; - for (Typed_identifier_list::const_iterator p = this->all_methods_->begin(); - p != this->all_methods_->end(); - ++p) - { - const std::string& method_name(p->name()); - if (Gogo::is_hidden_name(method_name) - && name == Gogo::unpack_hidden_name(method_name) - && gogo->pack_hidden_name(name, false) != method_name) - return true; - } - return false; -} - -// Whether this type is identical with T. - -bool -Interface_type::is_identical(const Interface_type* t, - bool errors_are_identical) const -{ - // If methods have not been finalized, then we are asking whether - // func redeclarations are the same. This is an error, so for - // simplicity we say they are never the same. - if (!this->methods_are_finalized_ || !t->methods_are_finalized_) - return false; - - // We require the same methods with the same types. The methods - // have already been sorted. - if (this->all_methods_ == NULL || t->all_methods_ == NULL) - return this->all_methods_ == t->all_methods_; - - if (this->assume_identical(this, t) || t->assume_identical(t, this)) - return true; - - Assume_identical* hold_ai = this->assume_identical_; - Assume_identical ai; - ai.t1 = this; - ai.t2 = t; - ai.next = hold_ai; - this->assume_identical_ = &ai; - - Typed_identifier_list::const_iterator p1 = this->all_methods_->begin(); - Typed_identifier_list::const_iterator p2; - for (p2 = t->all_methods_->begin(); p2 != t->all_methods_->end(); ++p1, ++p2) - { - if (p1 == this->all_methods_->end()) - break; - if (p1->name() != p2->name() - || !Type::are_identical(p1->type(), p2->type(), - errors_are_identical, NULL)) - break; - } - - this->assume_identical_ = hold_ai; - - return p1 == this->all_methods_->end() && p2 == t->all_methods_->end(); -} - -// Return true if T1 and T2 are assumed to be identical during a type -// comparison. - -bool -Interface_type::assume_identical(const Interface_type* t1, - const Interface_type* t2) const -{ - for (Assume_identical* p = this->assume_identical_; - p != NULL; - p = p->next) - if ((p->t1 == t1 && p->t2 == t2) || (p->t1 == t2 && p->t2 == t1)) - return true; - return false; -} - -// Whether we can assign the interface type T to this type. The types -// are known to not be identical. An interface assignment is only -// permitted if T is known to implement all methods in THIS. -// Otherwise a type guard is required. - -bool -Interface_type::is_compatible_for_assign(const Interface_type* t, - std::string* reason) const -{ - go_assert(this->methods_are_finalized_ && t->methods_are_finalized_); - if (this->all_methods_ == NULL) - return true; - for (Typed_identifier_list::const_iterator p = this->all_methods_->begin(); - p != this->all_methods_->end(); - ++p) - { - const Typed_identifier* m = t->find_method(p->name()); - if (m == NULL) - { - if (reason != NULL) - { - char buf[200]; - snprintf(buf, sizeof buf, - _("need explicit conversion; missing method %s%s%s"), - open_quote, Gogo::message_name(p->name()).c_str(), - close_quote); - reason->assign(buf); - } - return false; - } - - std::string subreason; - if (!Type::are_identical(p->type(), m->type(), true, &subreason)) - { - if (reason != NULL) - { - std::string n = Gogo::message_name(p->name()); - size_t len = 100 + n.length() + subreason.length(); - char* buf = new char[len]; - if (subreason.empty()) - snprintf(buf, len, _("incompatible type for method %s%s%s"), - open_quote, n.c_str(), close_quote); - else - snprintf(buf, len, - _("incompatible type for method %s%s%s (%s)"), - open_quote, n.c_str(), close_quote, - subreason.c_str()); - reason->assign(buf); - delete[] buf; - } - return false; - } - } - - return true; -} - -// Hash code. - -unsigned int -Interface_type::do_hash_for_method(Gogo*) const -{ - go_assert(this->methods_are_finalized_); - unsigned int ret = 0; - if (this->all_methods_ != NULL) - { - for (Typed_identifier_list::const_iterator p = - this->all_methods_->begin(); - p != this->all_methods_->end(); - ++p) - { - ret = Type::hash_string(p->name(), ret); - // We don't use the method type in the hash, to avoid - // infinite recursion if an interface method uses a type - // which is an interface which inherits from the interface - // itself. - // type T interface { F() interface {T}} - ret <<= 1; - } - } - return ret; -} - -// Return true if T implements the interface. If it does not, and -// REASON is not NULL, set *REASON to a useful error message. - -bool -Interface_type::implements_interface(const Type* t, std::string* reason) const -{ - go_assert(this->methods_are_finalized_); - if (this->all_methods_ == NULL) - return true; - - bool is_pointer = false; - const Named_type* nt = t->named_type(); - const Struct_type* st = t->struct_type(); - // If we start with a named type, we don't dereference it to find - // methods. - if (nt == NULL) - { - const Type* pt = t->points_to(); - if (pt != NULL) - { - // If T is a pointer to a named type, then we need to look at - // the type to which it points. - is_pointer = true; - nt = pt->named_type(); - st = pt->struct_type(); - } - } - - // If we have a named type, get the methods from it rather than from - // any struct type. - if (nt != NULL) - st = NULL; - - // Only named and struct types have methods. - if (nt == NULL && st == NULL) - { - if (reason != NULL) - { - if (t->points_to() != NULL - && t->points_to()->interface_type() != NULL) - reason->assign(_("pointer to interface type has no methods")); - else - reason->assign(_("type has no methods")); - } - return false; - } - - if (nt != NULL ? !nt->has_any_methods() : !st->has_any_methods()) - { - if (reason != NULL) - { - if (t->points_to() != NULL - && t->points_to()->interface_type() != NULL) - reason->assign(_("pointer to interface type has no methods")); - else - reason->assign(_("type has no methods")); - } - return false; - } - - for (Typed_identifier_list::const_iterator p = this->all_methods_->begin(); - p != this->all_methods_->end(); - ++p) - { - bool is_ambiguous = false; - Method* m = (nt != NULL - ? nt->method_function(p->name(), &is_ambiguous) - : st->method_function(p->name(), &is_ambiguous)); - if (m == NULL) - { - if (reason != NULL) - { - std::string n = Gogo::message_name(p->name()); - size_t len = n.length() + 100; - char* buf = new char[len]; - if (is_ambiguous) - snprintf(buf, len, _("ambiguous method %s%s%s"), - open_quote, n.c_str(), close_quote); - else - snprintf(buf, len, _("missing method %s%s%s"), - open_quote, n.c_str(), close_quote); - reason->assign(buf); - delete[] buf; - } - return false; - } - - Function_type *p_fn_type = p->type()->function_type(); - Function_type* m_fn_type = m->type()->function_type(); - go_assert(p_fn_type != NULL && m_fn_type != NULL); - std::string subreason; - if (!p_fn_type->is_identical(m_fn_type, true, true, &subreason)) - { - if (reason != NULL) - { - std::string n = Gogo::message_name(p->name()); - size_t len = 100 + n.length() + subreason.length(); - char* buf = new char[len]; - if (subreason.empty()) - snprintf(buf, len, _("incompatible type for method %s%s%s"), - open_quote, n.c_str(), close_quote); - else - snprintf(buf, len, - _("incompatible type for method %s%s%s (%s)"), - open_quote, n.c_str(), close_quote, - subreason.c_str()); - reason->assign(buf); - delete[] buf; - } - return false; - } - - if (!is_pointer && !m->is_value_method()) - { - if (reason != NULL) - { - std::string n = Gogo::message_name(p->name()); - size_t len = 100 + n.length(); - char* buf = new char[len]; - snprintf(buf, len, - _("method %s%s%s requires a pointer receiver"), - open_quote, n.c_str(), close_quote); - reason->assign(buf); - delete[] buf; - } - return false; - } - - // If the magic //go:nointerface comment was used, the method - // may not be used to implement interfaces. - if (m->nointerface()) - { - if (reason != NULL) - { - std::string n = Gogo::message_name(p->name()); - size_t len = 100 + n.length(); - char* buf = new char[len]; - snprintf(buf, len, - _("method %s%s%s is marked go:nointerface"), - open_quote, n.c_str(), close_quote); - reason->assign(buf); - delete[] buf; - } - return false; - } - } - - return true; -} - -// Return the backend representation of the empty interface type. We -// use the same struct for all empty interfaces. - -Btype* -Interface_type::get_backend_empty_interface_type(Gogo* gogo) -{ - static Btype* empty_interface_type; - if (empty_interface_type == NULL) - { - std::vector<Backend::Btyped_identifier> bfields(2); - - Location bloc = Linemap::predeclared_location(); - - Type* pdt = Type::make_type_descriptor_ptr_type(); - bfields[0].name = "__type_descriptor"; - bfields[0].btype = pdt->get_backend(gogo); - bfields[0].location = bloc; - - Type* vt = Type::make_pointer_type(Type::make_void_type()); - bfields[1].name = "__object"; - bfields[1].btype = vt->get_backend(gogo); - bfields[1].location = bloc; - - empty_interface_type = gogo->backend()->struct_type(bfields); - } - return empty_interface_type; -} - -// Return the fields of a non-empty interface type. This is not -// declared in types.h so that types.h doesn't have to #include -// backend.h. - -static void -get_backend_interface_fields(Gogo* gogo, Interface_type* type, - bool use_placeholder, - std::vector<Backend::Btyped_identifier>* bfields) -{ - Location loc = type->location(); - - std::vector<Backend::Btyped_identifier> mfields(type->methods()->size() + 1); - - Type* pdt = Type::make_type_descriptor_ptr_type(); - mfields[0].name = "__type_descriptor"; - mfields[0].btype = pdt->get_backend(gogo); - mfields[0].location = loc; - - std::string last_name = ""; - size_t i = 1; - for (Typed_identifier_list::const_iterator p = type->methods()->begin(); - p != type->methods()->end(); - ++p, ++i) - { - // The type of the method in Go only includes the parameters. - // The actual method also has a receiver, which is always a - // pointer. We need to add that pointer type here in order to - // generate the correct type for the backend. - Function_type* ft = p->type()->function_type(); - go_assert(ft->receiver() == NULL); - - const Typed_identifier_list* params = ft->parameters(); - Typed_identifier_list* mparams = new Typed_identifier_list(); - if (params != NULL) - mparams->reserve(params->size() + 1); - Type* vt = Type::make_pointer_type(Type::make_void_type()); - mparams->push_back(Typed_identifier("", vt, ft->location())); - if (params != NULL) - { - for (Typed_identifier_list::const_iterator pp = params->begin(); - pp != params->end(); - ++pp) - mparams->push_back(*pp); - } - - Typed_identifier_list* mresults = (ft->results() == NULL - ? NULL - : ft->results()->copy()); - Function_type* mft = Type::make_function_type(NULL, mparams, mresults, - ft->location()); - - mfields[i].name = Gogo::unpack_hidden_name(p->name()); - mfields[i].btype = (use_placeholder - ? mft->get_backend_placeholder(gogo) - : mft->get_backend(gogo)); - mfields[i].location = loc; - // Sanity check: the names should be sorted. - go_assert(p->name() > last_name); - last_name = p->name(); - } - - Btype* methods = gogo->backend()->struct_type(mfields); - - bfields->resize(2); - - (*bfields)[0].name = "__methods"; - (*bfields)[0].btype = gogo->backend()->pointer_type(methods); - (*bfields)[0].location = loc; - - Type* vt = Type::make_pointer_type(Type::make_void_type()); - (*bfields)[1].name = "__object"; - (*bfields)[1].btype = vt->get_backend(gogo); - (*bfields)[1].location = Linemap::predeclared_location(); -} - -// Return a tree for an interface type. An interface is a pointer to -// a struct. The struct has three fields. The first field is a -// pointer to the type descriptor for the dynamic type of the object. -// The second field is a pointer to a table of methods for the -// interface to be used with the object. The third field is the value -// of the object itself. - -Btype* -Interface_type::do_get_backend(Gogo* gogo) -{ - if (this->is_empty()) - return Interface_type::get_backend_empty_interface_type(gogo); - else - { - if (this->interface_btype_ != NULL) - return this->interface_btype_; - this->interface_btype_ = - gogo->backend()->placeholder_struct_type("", this->location_); - std::vector<Backend::Btyped_identifier> bfields; - get_backend_interface_fields(gogo, this, false, &bfields); - if (!gogo->backend()->set_placeholder_struct_type(this->interface_btype_, - bfields)) - this->interface_btype_ = gogo->backend()->error_type(); - return this->interface_btype_; - } -} - -// Finish the backend representation of the methods. - -void -Interface_type::finish_backend_methods(Gogo* gogo) -{ - if (!this->interface_type()->is_empty()) - { - const Typed_identifier_list* methods = this->methods(); - if (methods != NULL) - { - for (Typed_identifier_list::const_iterator p = methods->begin(); - p != methods->end(); - ++p) - p->type()->get_backend(gogo); - } - } -} - -// The type of an interface type descriptor. - -Type* -Interface_type::make_interface_type_descriptor_type() -{ - static Type* ret; - if (ret == NULL) - { - Type* tdt = Type::make_type_descriptor_type(); - Type* ptdt = Type::make_type_descriptor_ptr_type(); - - Type* string_type = Type::lookup_string_type(); - Type* pointer_string_type = Type::make_pointer_type(string_type); - - Struct_type* sm = - Type::make_builtin_struct_type(3, - "name", pointer_string_type, - "pkgPath", pointer_string_type, - "typ", ptdt); - - Type* nsm = Type::make_builtin_named_type("imethod", sm); - - Type* slice_nsm = Type::make_array_type(nsm, NULL); - - Struct_type* s = Type::make_builtin_struct_type(2, - "", tdt, - "methods", slice_nsm); - - ret = Type::make_builtin_named_type("InterfaceType", s); - } - - return ret; -} - -// Build a type descriptor for an interface type. - -Expression* -Interface_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location bloc = Linemap::predeclared_location(); - - Type* itdt = Interface_type::make_interface_type_descriptor_type(); - - const Struct_field_list* ifields = itdt->struct_type()->fields(); - - Expression_list* ivals = new Expression_list(); - ivals->reserve(2); - - Struct_field_list::const_iterator pif = ifields->begin(); - go_assert(pif->is_field_name("commonType")); - const int rt = RUNTIME_TYPE_KIND_INTERFACE; - ivals->push_back(this->type_descriptor_constructor(gogo, rt, name, NULL, - true)); - - ++pif; - go_assert(pif->is_field_name("methods")); - - Expression_list* methods = new Expression_list(); - if (this->all_methods_ != NULL) - { - Type* elemtype = pif->type()->array_type()->element_type(); - - methods->reserve(this->all_methods_->size()); - for (Typed_identifier_list::const_iterator pm = - this->all_methods_->begin(); - pm != this->all_methods_->end(); - ++pm) - { - const Struct_field_list* mfields = elemtype->struct_type()->fields(); - - Expression_list* mvals = new Expression_list(); - mvals->reserve(3); - - Struct_field_list::const_iterator pmf = mfields->begin(); - go_assert(pmf->is_field_name("name")); - std::string s = Gogo::unpack_hidden_name(pm->name()); - Expression* e = Expression::make_string(s, bloc); - mvals->push_back(Expression::make_unary(OPERATOR_AND, e, bloc)); - - ++pmf; - go_assert(pmf->is_field_name("pkgPath")); - if (!Gogo::is_hidden_name(pm->name())) - mvals->push_back(Expression::make_nil(bloc)); - else - { - s = Gogo::hidden_name_pkgpath(pm->name()); - e = Expression::make_string(s, bloc); - mvals->push_back(Expression::make_unary(OPERATOR_AND, e, bloc)); - } - - ++pmf; - go_assert(pmf->is_field_name("typ")); - mvals->push_back(Expression::make_type_descriptor(pm->type(), bloc)); - - ++pmf; - go_assert(pmf == mfields->end()); - - e = Expression::make_struct_composite_literal(elemtype, mvals, - bloc); - methods->push_back(e); - } - } - - ivals->push_back(Expression::make_slice_composite_literal(pif->type(), - methods, bloc)); - - ++pif; - go_assert(pif == ifields->end()); - - return Expression::make_struct_composite_literal(itdt, ivals, bloc); -} - -// Reflection string. - -void -Interface_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - ret->append("interface {"); - const Typed_identifier_list* methods = this->parse_methods_; - if (methods != NULL) - { - ret->push_back(' '); - for (Typed_identifier_list::const_iterator p = methods->begin(); - p != methods->end(); - ++p) - { - if (p != methods->begin()) - ret->append("; "); - if (p->name().empty()) - this->append_reflection(p->type(), gogo, ret); - else - { - if (!Gogo::is_hidden_name(p->name())) - ret->append(p->name()); - else if (gogo->pkgpath_from_option()) - ret->append(p->name().substr(1)); - else - { - // If no -fgo-pkgpath option, backward compatibility - // for how this used to work before -fgo-pkgpath was - // introduced. - std::string pkgpath = Gogo::hidden_name_pkgpath(p->name()); - ret->append(pkgpath.substr(pkgpath.find('.') + 1)); - ret->push_back('.'); - ret->append(Gogo::unpack_hidden_name(p->name())); - } - std::string sub = p->type()->reflection(gogo); - go_assert(sub.compare(0, 4, "func") == 0); - sub = sub.substr(4); - ret->append(sub); - } - } - ret->push_back(' '); - } - ret->append("}"); -} - -// Mangled name. - -void -Interface_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - go_assert(this->methods_are_finalized_); - - ret->push_back('I'); - - const Typed_identifier_list* methods = this->all_methods_; - if (methods != NULL && !this->seen_) - { - this->seen_ = true; - for (Typed_identifier_list::const_iterator p = methods->begin(); - p != methods->end(); - ++p) - { - if (!p->name().empty()) - { - std::string n; - if (!Gogo::is_hidden_name(p->name())) - n = p->name(); - else - { - n = "."; - std::string pkgpath = Gogo::hidden_name_pkgpath(p->name()); - n.append(Gogo::pkgpath_for_symbol(pkgpath)); - n.append(1, '.'); - n.append(Gogo::unpack_hidden_name(p->name())); - } - char buf[20]; - snprintf(buf, sizeof buf, "%u_", - static_cast<unsigned int>(n.length())); - ret->append(buf); - ret->append(n); - } - this->append_mangled_name(p->type(), gogo, ret); - } - this->seen_ = false; - } - - ret->push_back('e'); -} - -// Export. - -void -Interface_type::do_export(Export* exp) const -{ - exp->write_c_string("interface { "); - - const Typed_identifier_list* methods = this->parse_methods_; - if (methods != NULL) - { - for (Typed_identifier_list::const_iterator pm = methods->begin(); - pm != methods->end(); - ++pm) - { - if (pm->name().empty()) - { - exp->write_c_string("? "); - exp->write_type(pm->type()); - } - else - { - exp->write_string(pm->name()); - exp->write_c_string(" ("); - - const Function_type* fntype = pm->type()->function_type(); - - bool first = true; - const Typed_identifier_list* parameters = fntype->parameters(); - if (parameters != NULL) - { - bool is_varargs = fntype->is_varargs(); - for (Typed_identifier_list::const_iterator pp = - parameters->begin(); - pp != parameters->end(); - ++pp) - { - if (first) - first = false; - else - exp->write_c_string(", "); - exp->write_name(pp->name()); - exp->write_c_string(" "); - if (!is_varargs || pp + 1 != parameters->end()) - exp->write_type(pp->type()); - else - { - exp->write_c_string("..."); - Type *pptype = pp->type(); - exp->write_type(pptype->array_type()->element_type()); - } - } - } - - exp->write_c_string(")"); - - const Typed_identifier_list* results = fntype->results(); - if (results != NULL) - { - exp->write_c_string(" "); - if (results->size() == 1 && results->begin()->name().empty()) - exp->write_type(results->begin()->type()); - else - { - first = true; - exp->write_c_string("("); - for (Typed_identifier_list::const_iterator p = - results->begin(); - p != results->end(); - ++p) - { - if (first) - first = false; - else - exp->write_c_string(", "); - exp->write_name(p->name()); - exp->write_c_string(" "); - exp->write_type(p->type()); - } - exp->write_c_string(")"); - } - } - } - - exp->write_c_string("; "); - } - } - - exp->write_c_string("}"); -} - -// Import an interface type. - -Interface_type* -Interface_type::do_import(Import* imp) -{ - imp->require_c_string("interface { "); - - Typed_identifier_list* methods = new Typed_identifier_list; - while (imp->peek_char() != '}') - { - std::string name = imp->read_identifier(); - - if (name == "?") - { - imp->require_c_string(" "); - Type* t = imp->read_type(); - methods->push_back(Typed_identifier("", t, imp->location())); - imp->require_c_string("; "); - continue; - } - - imp->require_c_string(" ("); - - Typed_identifier_list* parameters; - bool is_varargs = false; - if (imp->peek_char() == ')') - parameters = NULL; - else - { - parameters = new Typed_identifier_list; - while (true) - { - std::string name = imp->read_name(); - imp->require_c_string(" "); - - if (imp->match_c_string("...")) - { - imp->advance(3); - is_varargs = true; - } - - Type* ptype = imp->read_type(); - if (is_varargs) - ptype = Type::make_array_type(ptype, NULL); - parameters->push_back(Typed_identifier(name, ptype, - imp->location())); - if (imp->peek_char() != ',') - break; - go_assert(!is_varargs); - imp->require_c_string(", "); - } - } - imp->require_c_string(")"); - - Typed_identifier_list* results; - if (imp->peek_char() != ' ') - results = NULL; - else - { - results = new Typed_identifier_list; - imp->advance(1); - if (imp->peek_char() != '(') - { - Type* rtype = imp->read_type(); - results->push_back(Typed_identifier("", rtype, imp->location())); - } - else - { - imp->advance(1); - while (true) - { - std::string name = imp->read_name(); - imp->require_c_string(" "); - Type* rtype = imp->read_type(); - results->push_back(Typed_identifier(name, rtype, - imp->location())); - if (imp->peek_char() != ',') - break; - imp->require_c_string(", "); - } - imp->require_c_string(")"); - } - } - - Function_type* fntype = Type::make_function_type(NULL, parameters, - results, - imp->location()); - if (is_varargs) - fntype->set_is_varargs(); - methods->push_back(Typed_identifier(name, fntype, imp->location())); - - imp->require_c_string("; "); - } - - imp->require_c_string("}"); - - if (methods->empty()) - { - delete methods; - methods = NULL; - } - - return Type::make_interface_type(methods, imp->location()); -} - -// Make an interface type. - -Interface_type* -Type::make_interface_type(Typed_identifier_list* methods, - Location location) -{ - return new Interface_type(methods, location); -} - -// Make an empty interface type. - -Interface_type* -Type::make_empty_interface_type(Location location) -{ - Interface_type* ret = new Interface_type(NULL, location); - ret->finalize_methods(); - return ret; -} - -// Class Method. - -// Bind a method to an object. - -Expression* -Method::bind_method(Expression* expr, Location location) const -{ - if (this->stub_ == NULL) - { - // When there is no stub object, the binding is determined by - // the child class. - return this->do_bind_method(expr, location); - } - return Expression::make_bound_method(expr, this->stub_, location); -} - -// Return the named object associated with a method. This may only be -// called after methods are finalized. - -Named_object* -Method::named_object() const -{ - if (this->stub_ != NULL) - return this->stub_; - return this->do_named_object(); -} - -// Class Named_method. - -// The type of the method. - -Function_type* -Named_method::do_type() const -{ - if (this->named_object_->is_function()) - return this->named_object_->func_value()->type(); - else if (this->named_object_->is_function_declaration()) - return this->named_object_->func_declaration_value()->type(); - else - go_unreachable(); -} - -// Return the location of the method receiver. - -Location -Named_method::do_receiver_location() const -{ - return this->do_type()->receiver()->location(); -} - -// Bind a method to an object. - -Expression* -Named_method::do_bind_method(Expression* expr, Location location) const -{ - Named_object* no = this->named_object_; - Bound_method_expression* bme = Expression::make_bound_method(expr, no, - location); - // If this is not a local method, and it does not use a stub, then - // the real method expects a different type. We need to cast the - // first argument. - if (this->depth() > 0 && !this->needs_stub_method()) - { - Function_type* ftype = this->do_type(); - go_assert(ftype->is_method()); - Type* frtype = ftype->receiver()->type(); - bme->set_first_argument_type(frtype); - } - return bme; -} - -// Return whether this method should not participate in interfaces. - -bool -Named_method::do_nointerface() const -{ - Named_object* no = this->named_object_; - return no->is_function() && no->func_value()->nointerface(); -} - -// Class Interface_method. - -// Bind a method to an object. - -Expression* -Interface_method::do_bind_method(Expression* expr, - Location location) const -{ - return Expression::make_interface_field_reference(expr, this->name_, - location); -} - -// Class Methods. - -// Insert a new method. Return true if it was inserted, false -// otherwise. - -bool -Methods::insert(const std::string& name, Method* m) -{ - std::pair<Method_map::iterator, bool> ins = - this->methods_.insert(std::make_pair(name, m)); - if (ins.second) - return true; - else - { - Method* old_method = ins.first->second; - if (m->depth() < old_method->depth()) - { - delete old_method; - ins.first->second = m; - return true; - } - else - { - if (m->depth() == old_method->depth()) - old_method->set_is_ambiguous(); - return false; - } - } -} - -// Return the number of unambiguous methods. - -size_t -Methods::count() const -{ - size_t ret = 0; - for (Method_map::const_iterator p = this->methods_.begin(); - p != this->methods_.end(); - ++p) - if (!p->second->is_ambiguous()) - ++ret; - return ret; -} - -// Class Named_type. - -// Return the name of the type. - -const std::string& -Named_type::name() const -{ - return this->named_object_->name(); -} - -// Return the name of the type to use in an error message. - -std::string -Named_type::message_name() const -{ - return this->named_object_->message_name(); -} - -// Whether this is an alias. There are currently only two aliases so -// we just recognize them by name. - -bool -Named_type::is_alias() const -{ - if (!this->is_builtin()) - return false; - const std::string& name(this->name()); - return name == "byte" || name == "rune"; -} - -// Return the base type for this type. We have to be careful about -// circular type definitions, which are invalid but may be seen here. - -Type* -Named_type::named_base() -{ - if (this->seen_) - return this; - this->seen_ = true; - Type* ret = this->type_->base(); - this->seen_ = false; - return ret; -} - -const Type* -Named_type::named_base() const -{ - if (this->seen_) - return this; - this->seen_ = true; - const Type* ret = this->type_->base(); - this->seen_ = false; - return ret; -} - -// Return whether this is an error type. We have to be careful about -// circular type definitions, which are invalid but may be seen here. - -bool -Named_type::is_named_error_type() const -{ - if (this->seen_) - return false; - this->seen_ = true; - bool ret = this->type_->is_error_type(); - this->seen_ = false; - return ret; -} - -// Whether this type is comparable. We have to be careful about -// circular type definitions. - -bool -Named_type::named_type_is_comparable(std::string* reason) const -{ - if (this->seen_) - return false; - this->seen_ = true; - bool ret = Type::are_compatible_for_comparison(true, this->type_, - this->type_, reason); - this->seen_ = false; - return ret; -} - -// Add a method to this type. - -Named_object* -Named_type::add_method(const std::string& name, Function* function) -{ - if (this->local_methods_ == NULL) - this->local_methods_ = new Bindings(NULL); - return this->local_methods_->add_function(name, NULL, function); -} - -// Add a method declaration to this type. - -Named_object* -Named_type::add_method_declaration(const std::string& name, Package* package, - Function_type* type, - Location location) -{ - if (this->local_methods_ == NULL) - this->local_methods_ = new Bindings(NULL); - return this->local_methods_->add_function_declaration(name, package, type, - location); -} - -// Add an existing method to this type. - -void -Named_type::add_existing_method(Named_object* no) -{ - if (this->local_methods_ == NULL) - this->local_methods_ = new Bindings(NULL); - this->local_methods_->add_named_object(no); -} - -// Look for a local method NAME, and returns its named object, or NULL -// if not there. - -Named_object* -Named_type::find_local_method(const std::string& name) const -{ - if (this->local_methods_ == NULL) - return NULL; - return this->local_methods_->lookup(name); -} - -// Return whether NAME is an unexported field or method, for better -// error reporting. - -bool -Named_type::is_unexported_local_method(Gogo* gogo, - const std::string& name) const -{ - Bindings* methods = this->local_methods_; - if (methods != NULL) - { - for (Bindings::const_declarations_iterator p = - methods->begin_declarations(); - p != methods->end_declarations(); - ++p) - { - if (Gogo::is_hidden_name(p->first) - && name == Gogo::unpack_hidden_name(p->first) - && gogo->pack_hidden_name(name, false) != p->first) - return true; - } - } - return false; -} - -// Build the complete list of methods for this type, which means -// recursively including all methods for anonymous fields. Create all -// stub methods. - -void -Named_type::finalize_methods(Gogo* gogo) -{ - if (this->all_methods_ != NULL) - return; - - if (this->local_methods_ != NULL - && (this->points_to() != NULL || this->interface_type() != NULL)) - { - const Bindings* lm = this->local_methods_; - for (Bindings::const_declarations_iterator p = lm->begin_declarations(); - p != lm->end_declarations(); - ++p) - error_at(p->second->location(), - "invalid pointer or interface receiver type"); - delete this->local_methods_; - this->local_methods_ = NULL; - return; - } - - Type::finalize_methods(gogo, this, this->location_, &this->all_methods_); -} - -// Return the method NAME, or NULL if there isn't one or if it is -// ambiguous. Set *IS_AMBIGUOUS if the method exists but is -// ambiguous. - -Method* -Named_type::method_function(const std::string& name, bool* is_ambiguous) const -{ - return Type::method_function(this->all_methods_, name, is_ambiguous); -} - -// Return a pointer to the interface method table for this type for -// the interface INTERFACE. IS_POINTER is true if this is for a -// pointer to THIS. - -tree -Named_type::interface_method_table(Gogo* gogo, const Interface_type* interface, - bool is_pointer) -{ - return Type::interface_method_table(gogo, this, interface, is_pointer, - &this->interface_method_tables_, - &this->pointer_interface_method_tables_); -} - -// Return whether a named type has any hidden fields. - -bool -Named_type::named_type_has_hidden_fields(std::string* reason) const -{ - if (this->seen_) - return false; - this->seen_ = true; - bool ret = this->type_->has_hidden_fields(this, reason); - this->seen_ = false; - return ret; -} - -// Look for a use of a complete type within another type. This is -// used to check that we don't try to use a type within itself. - -class Find_type_use : public Traverse -{ - public: - Find_type_use(Named_type* find_type) - : Traverse(traverse_types), - find_type_(find_type), found_(false) - { } - - // Whether we found the type. - bool - found() const - { return this->found_; } - - protected: - int - type(Type*); - - private: - // The type we are looking for. - Named_type* find_type_; - // Whether we found the type. - bool found_; -}; - -// Check for FIND_TYPE in TYPE. - -int -Find_type_use::type(Type* type) -{ - if (type->named_type() != NULL && this->find_type_ == type->named_type()) - { - this->found_ = true; - return TRAVERSE_EXIT; - } - - // It's OK if we see a reference to the type in any type which is - // essentially a pointer: a pointer, a slice, a function, a map, or - // a channel. - if (type->points_to() != NULL - || type->is_slice_type() - || type->function_type() != NULL - || type->map_type() != NULL - || type->channel_type() != NULL) - return TRAVERSE_SKIP_COMPONENTS; - - // For an interface, a reference to the type in a method type should - // be ignored, but we have to consider direct inheritance. When - // this is called, there may be cases of direct inheritance - // represented as a method with no name. - if (type->interface_type() != NULL) - { - const Typed_identifier_list* methods = type->interface_type()->methods(); - if (methods != NULL) - { - for (Typed_identifier_list::const_iterator p = methods->begin(); - p != methods->end(); - ++p) - { - if (p->name().empty()) - { - if (Type::traverse(p->type(), this) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - } - } - } - return TRAVERSE_SKIP_COMPONENTS; - } - - // Otherwise, FIND_TYPE_ depends on TYPE, in the sense that we need - // to convert TYPE to the backend representation before we convert - // FIND_TYPE_. - if (type->named_type() != NULL) - { - switch (type->base()->classification()) - { - case Type::TYPE_ERROR: - case Type::TYPE_BOOLEAN: - case Type::TYPE_INTEGER: - case Type::TYPE_FLOAT: - case Type::TYPE_COMPLEX: - case Type::TYPE_STRING: - case Type::TYPE_NIL: - break; - - case Type::TYPE_ARRAY: - case Type::TYPE_STRUCT: - this->find_type_->add_dependency(type->named_type()); - break; - - case Type::TYPE_NAMED: - case Type::TYPE_FORWARD: - go_assert(saw_errors()); - break; - - case Type::TYPE_VOID: - case Type::TYPE_SINK: - case Type::TYPE_FUNCTION: - case Type::TYPE_POINTER: - case Type::TYPE_CALL_MULTIPLE_RESULT: - case Type::TYPE_MAP: - case Type::TYPE_CHANNEL: - case Type::TYPE_INTERFACE: - default: - go_unreachable(); - } - } - - return TRAVERSE_CONTINUE; -} - -// Verify that a named type does not refer to itself. - -bool -Named_type::do_verify() -{ - if (this->is_verified_) - return true; - this->is_verified_ = true; - - Find_type_use find(this); - Type::traverse(this->type_, &find); - if (find.found()) - { - error_at(this->location_, "invalid recursive type %qs", - this->message_name().c_str()); - this->is_error_ = true; - return false; - } - - // Check whether any of the local methods overloads an existing - // struct field or interface method. We don't need to check the - // list of methods against itself: that is handled by the Bindings - // code. - if (this->local_methods_ != NULL) - { - Struct_type* st = this->type_->struct_type(); - if (st != NULL) - { - for (Bindings::const_declarations_iterator p = - this->local_methods_->begin_declarations(); - p != this->local_methods_->end_declarations(); - ++p) - { - const std::string& name(p->first); - if (st != NULL && st->find_local_field(name, NULL) != NULL) - { - error_at(p->second->location(), - "method %qs redeclares struct field name", - Gogo::message_name(name).c_str()); - } - } - } - } - - return true; -} - -// Return whether this type is or contains a pointer. - -bool -Named_type::do_has_pointer() const -{ - if (this->seen_) - return false; - this->seen_ = true; - bool ret = this->type_->has_pointer(); - this->seen_ = false; - return ret; -} - -// Return whether comparisons for this type can use the identity -// function. - -bool -Named_type::do_compare_is_identity(Gogo* gogo) -{ - // We don't use this->seen_ here because compare_is_identity may - // call base() later, and that will mess up if seen_ is set here. - if (this->seen_in_compare_is_identity_) - return false; - this->seen_in_compare_is_identity_ = true; - bool ret = this->type_->compare_is_identity(gogo); - this->seen_in_compare_is_identity_ = false; - return ret; -} - -// Return a hash code. This is used for method lookup. We simply -// hash on the name itself. - -unsigned int -Named_type::do_hash_for_method(Gogo* gogo) const -{ - if (this->is_alias()) - return this->type_->named_type()->do_hash_for_method(gogo); - - const std::string& name(this->named_object()->name()); - unsigned int ret = Type::hash_string(name, 0); - - // GOGO will be NULL here when called from Type_hash_identical. - // That is OK because that is only used for internal hash tables - // where we are going to be comparing named types for equality. In - // other cases, which are cases where the runtime is going to - // compare hash codes to see if the types are the same, we need to - // include the pkgpath in the hash. - if (gogo != NULL && !Gogo::is_hidden_name(name) && !this->is_builtin()) - { - const Package* package = this->named_object()->package(); - if (package == NULL) - ret = Type::hash_string(gogo->pkgpath(), ret); - else - ret = Type::hash_string(package->pkgpath(), ret); - } - - return ret; -} - -// Convert a named type to the backend representation. In order to -// get dependencies right, we fill in a dummy structure for this type, -// then convert all the dependencies, then complete this type. When -// this function is complete, the size of the type is known. - -void -Named_type::convert(Gogo* gogo) -{ - if (this->is_error_ || this->is_converted_) - return; - - this->create_placeholder(gogo); - - // If we are called to turn unsafe.Sizeof into a constant, we may - // not have verified the type yet. We have to make sure it is - // verified, since that sets the list of dependencies. - this->verify(); - - // Convert all the dependencies. If they refer indirectly back to - // this type, they will pick up the intermediate tree we just - // created. - for (std::vector<Named_type*>::const_iterator p = this->dependencies_.begin(); - p != this->dependencies_.end(); - ++p) - (*p)->convert(gogo); - - // Complete this type. - Btype* bt = this->named_btype_; - Type* base = this->type_->base(); - switch (base->classification()) - { - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_STRING: - case TYPE_NIL: - break; - - case TYPE_MAP: - case TYPE_CHANNEL: - break; - - case TYPE_FUNCTION: - case TYPE_POINTER: - // The size of these types is already correct. We don't worry - // about filling them in until later, when we also track - // circular references. - break; - - case TYPE_STRUCT: - { - std::vector<Backend::Btyped_identifier> bfields; - get_backend_struct_fields(gogo, base->struct_type()->fields(), - true, &bfields); - if (!gogo->backend()->set_placeholder_struct_type(bt, bfields)) - bt = gogo->backend()->error_type(); - } - break; - - case TYPE_ARRAY: - // Slice types were completed in create_placeholder. - if (!base->is_slice_type()) - { - Btype* bet = base->array_type()->get_backend_element(gogo, true); - Bexpression* blen = base->array_type()->get_backend_length(gogo); - if (!gogo->backend()->set_placeholder_array_type(bt, bet, blen)) - bt = gogo->backend()->error_type(); - } - break; - - case TYPE_INTERFACE: - // Interface types were completed in create_placeholder. - break; - - case TYPE_ERROR: - return; - - default: - case TYPE_SINK: - case TYPE_CALL_MULTIPLE_RESULT: - case TYPE_NAMED: - case TYPE_FORWARD: - go_unreachable(); - } - - this->named_btype_ = bt; - this->is_converted_ = true; - this->is_placeholder_ = false; -} - -// Create the placeholder for a named type. This is the first step in -// converting to the backend representation. - -void -Named_type::create_placeholder(Gogo* gogo) -{ - if (this->is_error_) - this->named_btype_ = gogo->backend()->error_type(); - - if (this->named_btype_ != NULL) - return; - - // Create the structure for this type. Note that because we call - // base() here, we don't attempt to represent a named type defined - // as another named type. Instead both named types will point to - // different base representations. - Type* base = this->type_->base(); - Btype* bt; - bool set_name = true; - switch (base->classification()) - { - case TYPE_ERROR: - this->is_error_ = true; - this->named_btype_ = gogo->backend()->error_type(); - return; - - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_STRING: - case TYPE_NIL: - // These are simple basic types, we can just create them - // directly. - bt = Type::get_named_base_btype(gogo, base); - break; - - case TYPE_MAP: - case TYPE_CHANNEL: - // All maps and channels have the same backend representation. - bt = Type::get_named_base_btype(gogo, base); - break; - - case TYPE_FUNCTION: - case TYPE_POINTER: - { - bool for_function = base->classification() == TYPE_FUNCTION; - bt = gogo->backend()->placeholder_pointer_type(this->name(), - this->location_, - for_function); - set_name = false; - } - break; - - case TYPE_STRUCT: - bt = gogo->backend()->placeholder_struct_type(this->name(), - this->location_); - this->is_placeholder_ = true; - set_name = false; - break; - - case TYPE_ARRAY: - if (base->is_slice_type()) - bt = gogo->backend()->placeholder_struct_type(this->name(), - this->location_); - else - { - bt = gogo->backend()->placeholder_array_type(this->name(), - this->location_); - this->is_placeholder_ = true; - } - set_name = false; - break; - - case TYPE_INTERFACE: - if (base->interface_type()->is_empty()) - bt = Interface_type::get_backend_empty_interface_type(gogo); - else - { - bt = gogo->backend()->placeholder_struct_type(this->name(), - this->location_); - set_name = false; - } - break; - - default: - case TYPE_SINK: - case TYPE_CALL_MULTIPLE_RESULT: - case TYPE_NAMED: - case TYPE_FORWARD: - go_unreachable(); - } - - if (set_name) - bt = gogo->backend()->named_type(this->name(), bt, this->location_); - - this->named_btype_ = bt; - - if (base->is_slice_type()) - { - // We do not record slices as dependencies of other types, - // because we can fill them in completely here with the final - // size. - std::vector<Backend::Btyped_identifier> bfields; - get_backend_slice_fields(gogo, base->array_type(), true, &bfields); - if (!gogo->backend()->set_placeholder_struct_type(bt, bfields)) - this->named_btype_ = gogo->backend()->error_type(); - } - else if (base->interface_type() != NULL - && !base->interface_type()->is_empty()) - { - // We do not record interfaces as dependencies of other types, - // because we can fill them in completely here with the final - // size. - std::vector<Backend::Btyped_identifier> bfields; - get_backend_interface_fields(gogo, base->interface_type(), true, - &bfields); - if (!gogo->backend()->set_placeholder_struct_type(bt, bfields)) - this->named_btype_ = gogo->backend()->error_type(); - } -} - -// Get a tree for a named type. - -Btype* -Named_type::do_get_backend(Gogo* gogo) -{ - if (this->is_error_) - return gogo->backend()->error_type(); - - Btype* bt = this->named_btype_; - - if (!gogo->named_types_are_converted()) - { - // We have not completed converting named types. NAMED_BTYPE_ - // is a placeholder and we shouldn't do anything further. - if (bt != NULL) - return bt; - - // We don't build dependencies for types whose sizes do not - // change or are not relevant, so we may see them here while - // converting types. - this->create_placeholder(gogo); - bt = this->named_btype_; - go_assert(bt != NULL); - return bt; - } - - // We are not converting types. This should only be called if the - // type has already been converted. - if (!this->is_converted_) - { - go_assert(saw_errors()); - return gogo->backend()->error_type(); - } - - go_assert(bt != NULL); - - // Complete the tree. - Type* base = this->type_->base(); - Btype* bt1; - switch (base->classification()) - { - case TYPE_ERROR: - return gogo->backend()->error_type(); - - case TYPE_VOID: - case TYPE_BOOLEAN: - case TYPE_INTEGER: - case TYPE_FLOAT: - case TYPE_COMPLEX: - case TYPE_STRING: - case TYPE_NIL: - case TYPE_MAP: - case TYPE_CHANNEL: - return bt; - - case TYPE_STRUCT: - if (!this->seen_in_get_backend_) - { - this->seen_in_get_backend_ = true; - base->struct_type()->finish_backend_fields(gogo); - this->seen_in_get_backend_ = false; - } - return bt; - - case TYPE_ARRAY: - if (!this->seen_in_get_backend_) - { - this->seen_in_get_backend_ = true; - base->array_type()->finish_backend_element(gogo); - this->seen_in_get_backend_ = false; - } - return bt; - - case TYPE_INTERFACE: - if (!this->seen_in_get_backend_) - { - this->seen_in_get_backend_ = true; - base->interface_type()->finish_backend_methods(gogo); - this->seen_in_get_backend_ = false; - } - return bt; - - case TYPE_FUNCTION: - // Don't build a circular data structure. GENERIC can't handle - // it. - if (this->seen_in_get_backend_) - { - this->is_circular_ = true; - return gogo->backend()->circular_pointer_type(bt, true); - } - this->seen_in_get_backend_ = true; - bt1 = Type::get_named_base_btype(gogo, base); - this->seen_in_get_backend_ = false; - if (this->is_circular_) - bt1 = gogo->backend()->circular_pointer_type(bt, true); - if (!gogo->backend()->set_placeholder_function_type(bt, bt1)) - bt = gogo->backend()->error_type(); - return bt; - - case TYPE_POINTER: - // Don't build a circular data structure. GENERIC can't handle - // it. - if (this->seen_in_get_backend_) - { - this->is_circular_ = true; - return gogo->backend()->circular_pointer_type(bt, false); - } - this->seen_in_get_backend_ = true; - bt1 = Type::get_named_base_btype(gogo, base); - this->seen_in_get_backend_ = false; - if (this->is_circular_) - bt1 = gogo->backend()->circular_pointer_type(bt, false); - if (!gogo->backend()->set_placeholder_pointer_type(bt, bt1)) - bt = gogo->backend()->error_type(); - return bt; - - default: - case TYPE_SINK: - case TYPE_CALL_MULTIPLE_RESULT: - case TYPE_NAMED: - case TYPE_FORWARD: - go_unreachable(); - } - - go_unreachable(); -} - -// Build a type descriptor for a named type. - -Expression* -Named_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - if (name == NULL && this->is_alias()) - return this->type_->type_descriptor(gogo, this->type_); - - // If NAME is not NULL, then we don't really want the type - // descriptor for this type; we want the descriptor for the - // underlying type, giving it the name NAME. - return this->named_type_descriptor(gogo, this->type_, - name == NULL ? this : name); -} - -// Add to the reflection string. This is used mostly for the name of -// the type used in a type descriptor, not for actual reflection -// strings. - -void -Named_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - if (this->is_alias()) - { - this->append_reflection(this->type_, gogo, ret); - return; - } - if (!this->is_builtin()) - { - // We handle -fgo-prefix and -fgo-pkgpath differently here for - // compatibility with how the compiler worked before - // -fgo-pkgpath was introduced. When -fgo-pkgpath is specified, - // we use it to make a unique reflection string, so that the - // type canonicalization in the reflect package will work. In - // order to be compatible with the gc compiler, we put tabs into - // the package path, so that the reflect methods can discard it. - const Package* package = this->named_object_->package(); - if (gogo->pkgpath_from_option()) - { - ret->push_back('\t'); - ret->append(package != NULL - ? package->pkgpath_symbol() - : gogo->pkgpath_symbol()); - ret->push_back('\t'); - } - ret->append(package != NULL - ? package->package_name() - : gogo->package_name()); - ret->push_back('.'); - } - if (this->in_function_ != NULL) - { - ret->push_back('\t'); - ret->append(Gogo::unpack_hidden_name(this->in_function_->name())); - ret->push_back('$'); - if (this->in_function_index_ > 0) - { - char buf[30]; - snprintf(buf, sizeof buf, "%u", this->in_function_index_); - ret->append(buf); - ret->push_back('$'); - } - ret->push_back('\t'); - } - ret->append(Gogo::unpack_hidden_name(this->named_object_->name())); -} - -// Get the mangled name. - -void -Named_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - if (this->is_alias()) - { - this->append_mangled_name(this->type_, gogo, ret); - return; - } - Named_object* no = this->named_object_; - std::string name; - if (this->is_builtin()) - go_assert(this->in_function_ == NULL); - else - { - const std::string& pkgpath(no->package() == NULL - ? gogo->pkgpath_symbol() - : no->package()->pkgpath_symbol()); - name = pkgpath; - name.append(1, '.'); - if (this->in_function_ != NULL) - { - name.append(Gogo::unpack_hidden_name(this->in_function_->name())); - name.append(1, '$'); - if (this->in_function_index_ > 0) - { - char buf[30]; - snprintf(buf, sizeof buf, "%u", this->in_function_index_); - name.append(buf); - name.append(1, '$'); - } - } - } - name.append(Gogo::unpack_hidden_name(no->name())); - char buf[20]; - snprintf(buf, sizeof buf, "N%u_", static_cast<unsigned int>(name.length())); - ret->append(buf); - ret->append(name); -} - -// Export the type. This is called to export a global type. - -void -Named_type::export_named_type(Export* exp, const std::string&) const -{ - // We don't need to write the name of the type here, because it will - // be written by Export::write_type anyhow. - exp->write_c_string("type "); - exp->write_type(this); - exp->write_c_string(";\n"); -} - -// Import a named type. - -void -Named_type::import_named_type(Import* imp, Named_type** ptype) -{ - imp->require_c_string("type "); - Type *type = imp->read_type(); - *ptype = type->named_type(); - go_assert(*ptype != NULL); - imp->require_c_string(";\n"); -} - -// Export the type when it is referenced by another type. In this -// case Export::export_type will already have issued the name. - -void -Named_type::do_export(Export* exp) const -{ - exp->write_type(this->type_); - - // To save space, we only export the methods directly attached to - // this type. - Bindings* methods = this->local_methods_; - if (methods == NULL) - return; - - exp->write_c_string("\n"); - for (Bindings::const_definitions_iterator p = methods->begin_definitions(); - p != methods->end_definitions(); - ++p) - { - exp->write_c_string(" "); - (*p)->export_named_object(exp); - } - - for (Bindings::const_declarations_iterator p = methods->begin_declarations(); - p != methods->end_declarations(); - ++p) - { - if (p->second->is_function_declaration()) - { - exp->write_c_string(" "); - p->second->export_named_object(exp); - } - } -} - -// Make a named type. - -Named_type* -Type::make_named_type(Named_object* named_object, Type* type, - Location location) -{ - return new Named_type(named_object, type, location); -} - -// Finalize the methods for TYPE. It will be a named type or a struct -// type. This sets *ALL_METHODS to the list of methods, and builds -// all required stubs. - -void -Type::finalize_methods(Gogo* gogo, const Type* type, Location location, - Methods** all_methods) -{ - *all_methods = NULL; - Types_seen types_seen; - Type::add_methods_for_type(type, NULL, 0, false, false, &types_seen, - all_methods); - Type::build_stub_methods(gogo, type, *all_methods, location); -} - -// Add the methods for TYPE to *METHODS. FIELD_INDEXES is used to -// build up the struct field indexes as we go. DEPTH is the depth of -// the field within TYPE. IS_EMBEDDED_POINTER is true if we are -// adding these methods for an anonymous field with pointer type. -// NEEDS_STUB_METHOD is true if we need to use a stub method which -// calls the real method. TYPES_SEEN is used to avoid infinite -// recursion. - -void -Type::add_methods_for_type(const Type* type, - const Method::Field_indexes* field_indexes, - unsigned int depth, - bool is_embedded_pointer, - bool needs_stub_method, - Types_seen* types_seen, - Methods** methods) -{ - // Pointer types may not have methods. - if (type->points_to() != NULL) - return; - - const Named_type* nt = type->named_type(); - if (nt != NULL) - { - std::pair<Types_seen::iterator, bool> ins = types_seen->insert(nt); - if (!ins.second) - return; - } - - if (nt != NULL) - Type::add_local_methods_for_type(nt, field_indexes, depth, - is_embedded_pointer, needs_stub_method, - methods); - - Type::add_embedded_methods_for_type(type, field_indexes, depth, - is_embedded_pointer, needs_stub_method, - types_seen, methods); - - // If we are called with depth > 0, then we are looking at an - // anonymous field of a struct. If such a field has interface type, - // then we need to add the interface methods. We don't want to add - // them when depth == 0, because we will already handle them - // following the usual rules for an interface type. - if (depth > 0) - Type::add_interface_methods_for_type(type, field_indexes, depth, methods); -} - -// Add the local methods for the named type NT to *METHODS. The -// parameters are as for add_methods_to_type. - -void -Type::add_local_methods_for_type(const Named_type* nt, - const Method::Field_indexes* field_indexes, - unsigned int depth, - bool is_embedded_pointer, - bool needs_stub_method, - Methods** methods) -{ - const Bindings* local_methods = nt->local_methods(); - if (local_methods == NULL) - return; - - if (*methods == NULL) - *methods = new Methods(); - - for (Bindings::const_declarations_iterator p = - local_methods->begin_declarations(); - p != local_methods->end_declarations(); - ++p) - { - Named_object* no = p->second; - bool is_value_method = (is_embedded_pointer - || !Type::method_expects_pointer(no)); - Method* m = new Named_method(no, field_indexes, depth, is_value_method, - (needs_stub_method - || (depth > 0 && is_value_method))); - if (!(*methods)->insert(no->name(), m)) - delete m; - } -} - -// Add the embedded methods for TYPE to *METHODS. These are the -// methods attached to anonymous fields. The parameters are as for -// add_methods_to_type. - -void -Type::add_embedded_methods_for_type(const Type* type, - const Method::Field_indexes* field_indexes, - unsigned int depth, - bool is_embedded_pointer, - bool needs_stub_method, - Types_seen* types_seen, - Methods** methods) -{ - // Look for anonymous fields in TYPE. TYPE has fields if it is a - // struct. - const Struct_type* st = type->struct_type(); - if (st == NULL) - return; - - const Struct_field_list* fields = st->fields(); - if (fields == NULL) - return; - - unsigned int i = 0; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf, ++i) - { - if (!pf->is_anonymous()) - continue; - - Type* ftype = pf->type(); - bool is_pointer = false; - if (ftype->points_to() != NULL) - { - ftype = ftype->points_to(); - is_pointer = true; - } - Named_type* fnt = ftype->named_type(); - if (fnt == NULL) - { - // This is an error, but it will be diagnosed elsewhere. - continue; - } - - Method::Field_indexes* sub_field_indexes = new Method::Field_indexes(); - sub_field_indexes->next = field_indexes; - sub_field_indexes->field_index = i; - - Type::add_methods_for_type(fnt, sub_field_indexes, depth + 1, - (is_embedded_pointer || is_pointer), - (needs_stub_method - || is_pointer - || i > 0), - types_seen, - methods); - } -} - -// If TYPE is an interface type, then add its method to *METHODS. -// This is for interface methods attached to an anonymous field. The -// parameters are as for add_methods_for_type. - -void -Type::add_interface_methods_for_type(const Type* type, - const Method::Field_indexes* field_indexes, - unsigned int depth, - Methods** methods) -{ - const Interface_type* it = type->interface_type(); - if (it == NULL) - return; - - const Typed_identifier_list* imethods = it->methods(); - if (imethods == NULL) - return; - - if (*methods == NULL) - *methods = new Methods(); - - for (Typed_identifier_list::const_iterator pm = imethods->begin(); - pm != imethods->end(); - ++pm) - { - Function_type* fntype = pm->type()->function_type(); - if (fntype == NULL) - { - // This is an error, but it should be reported elsewhere - // when we look at the methods for IT. - continue; - } - go_assert(!fntype->is_method()); - fntype = fntype->copy_with_receiver(const_cast<Type*>(type)); - Method* m = new Interface_method(pm->name(), pm->location(), fntype, - field_indexes, depth); - if (!(*methods)->insert(pm->name(), m)) - delete m; - } -} - -// Build stub methods for TYPE as needed. METHODS is the set of -// methods for the type. A stub method may be needed when a type -// inherits a method from an anonymous field. When we need the -// address of the method, as in a type descriptor, we need to build a -// little stub which does the required field dereferences and jumps to -// the real method. LOCATION is the location of the type definition. - -void -Type::build_stub_methods(Gogo* gogo, const Type* type, const Methods* methods, - Location location) -{ - if (methods == NULL) - return; - for (Methods::const_iterator p = methods->begin(); - p != methods->end(); - ++p) - { - Method* m = p->second; - if (m->is_ambiguous() || !m->needs_stub_method()) - continue; - - const std::string& name(p->first); - - // Build a stub method. - - const Function_type* fntype = m->type(); - - static unsigned int counter; - char buf[100]; - snprintf(buf, sizeof buf, "$this%u", counter); - ++counter; - - Type* receiver_type = const_cast<Type*>(type); - if (!m->is_value_method()) - receiver_type = Type::make_pointer_type(receiver_type); - Location receiver_location = m->receiver_location(); - Typed_identifier* receiver = new Typed_identifier(buf, receiver_type, - receiver_location); - - const Typed_identifier_list* fnparams = fntype->parameters(); - Typed_identifier_list* stub_params; - if (fnparams == NULL || fnparams->empty()) - stub_params = NULL; - else - { - // We give each stub parameter a unique name. - stub_params = new Typed_identifier_list(); - for (Typed_identifier_list::const_iterator pp = fnparams->begin(); - pp != fnparams->end(); - ++pp) - { - char pbuf[100]; - snprintf(pbuf, sizeof pbuf, "$p%u", counter); - stub_params->push_back(Typed_identifier(pbuf, pp->type(), - pp->location())); - ++counter; - } - } - - const Typed_identifier_list* fnresults = fntype->results(); - Typed_identifier_list* stub_results; - if (fnresults == NULL || fnresults->empty()) - stub_results = NULL; - else - { - // We create the result parameters without any names, since - // we won't refer to them. - stub_results = new Typed_identifier_list(); - for (Typed_identifier_list::const_iterator pr = fnresults->begin(); - pr != fnresults->end(); - ++pr) - stub_results->push_back(Typed_identifier("", pr->type(), - pr->location())); - } - - Function_type* stub_type = Type::make_function_type(receiver, - stub_params, - stub_results, - fntype->location()); - if (fntype->is_varargs()) - stub_type->set_is_varargs(); - - // We only create the function in the package which creates the - // type. - const Package* package; - if (type->named_type() == NULL) - package = NULL; - else - package = type->named_type()->named_object()->package(); - Named_object* stub; - if (package != NULL) - stub = Named_object::make_function_declaration(name, package, - stub_type, location); - else - { - stub = gogo->start_function(name, stub_type, false, - fntype->location()); - Type::build_one_stub_method(gogo, m, buf, stub_params, - fntype->is_varargs(), location); - gogo->finish_function(fntype->location()); - - if (m->nointerface() && stub->is_function()) - stub->func_value()->set_nointerface(); - } - - m->set_stub_object(stub); - } -} - -// Build a stub method which adjusts the receiver as required to call -// METHOD. RECEIVER_NAME is the name we used for the receiver. -// PARAMS is the list of function parameters. - -void -Type::build_one_stub_method(Gogo* gogo, Method* method, - const char* receiver_name, - const Typed_identifier_list* params, - bool is_varargs, - Location location) -{ - Named_object* receiver_object = gogo->lookup(receiver_name, NULL); - go_assert(receiver_object != NULL); - - Expression* expr = Expression::make_var_reference(receiver_object, location); - expr = Type::apply_field_indexes(expr, method->field_indexes(), location); - if (expr->type()->points_to() == NULL) - expr = Expression::make_unary(OPERATOR_AND, expr, location); - - Expression_list* arguments; - if (params == NULL || params->empty()) - arguments = NULL; - else - { - arguments = new Expression_list(); - for (Typed_identifier_list::const_iterator p = params->begin(); - p != params->end(); - ++p) - { - Named_object* param = gogo->lookup(p->name(), NULL); - go_assert(param != NULL); - Expression* param_ref = Expression::make_var_reference(param, - location); - arguments->push_back(param_ref); - } - } - - Expression* func = method->bind_method(expr, location); - go_assert(func != NULL); - Call_expression* call = Expression::make_call(func, arguments, is_varargs, - location); - call->set_hidden_fields_are_ok(); - size_t count = call->result_count(); - if (count == 0) - gogo->add_statement(Statement::make_statement(call, true)); - else - { - Expression_list* retvals = new Expression_list(); - if (count <= 1) - retvals->push_back(call); - else - { - for (size_t i = 0; i < count; ++i) - retvals->push_back(Expression::make_call_result(call, i)); - } - Return_statement* retstat = Statement::make_return_statement(retvals, - location); - - // We can return values with hidden fields from a stub. This is - // necessary if the method is itself hidden. - retstat->set_hidden_fields_are_ok(); - - gogo->add_statement(retstat); - } -} - -// Apply FIELD_INDEXES to EXPR. The field indexes have to be applied -// in reverse order. - -Expression* -Type::apply_field_indexes(Expression* expr, - const Method::Field_indexes* field_indexes, - Location location) -{ - if (field_indexes == NULL) - return expr; - expr = Type::apply_field_indexes(expr, field_indexes->next, location); - Struct_type* stype = expr->type()->deref()->struct_type(); - go_assert(stype != NULL - && field_indexes->field_index < stype->field_count()); - if (expr->type()->struct_type() == NULL) - { - go_assert(expr->type()->points_to() != NULL); - expr = Expression::make_unary(OPERATOR_MULT, expr, location); - go_assert(expr->type()->struct_type() == stype); - } - return Expression::make_field_reference(expr, field_indexes->field_index, - location); -} - -// Return whether NO is a method for which the receiver is a pointer. - -bool -Type::method_expects_pointer(const Named_object* no) -{ - const Function_type *fntype; - if (no->is_function()) - fntype = no->func_value()->type(); - else if (no->is_function_declaration()) - fntype = no->func_declaration_value()->type(); - else - go_unreachable(); - return fntype->receiver()->type()->points_to() != NULL; -} - -// Given a set of methods for a type, METHODS, return the method NAME, -// or NULL if there isn't one or if it is ambiguous. If IS_AMBIGUOUS -// is not NULL, then set *IS_AMBIGUOUS to true if the method exists -// but is ambiguous (and return NULL). - -Method* -Type::method_function(const Methods* methods, const std::string& name, - bool* is_ambiguous) -{ - if (is_ambiguous != NULL) - *is_ambiguous = false; - if (methods == NULL) - return NULL; - Methods::const_iterator p = methods->find(name); - if (p == methods->end()) - return NULL; - Method* m = p->second; - if (m->is_ambiguous()) - { - if (is_ambiguous != NULL) - *is_ambiguous = true; - return NULL; - } - return m; -} - -// Return a pointer to the interface method table for TYPE for the -// interface INTERFACE. - -tree -Type::interface_method_table(Gogo* gogo, Type* type, - const Interface_type *interface, - bool is_pointer, - Interface_method_tables** method_tables, - Interface_method_tables** pointer_tables) -{ - go_assert(!interface->is_empty()); - - Interface_method_tables** pimt = is_pointer ? method_tables : pointer_tables; - - if (*pimt == NULL) - *pimt = new Interface_method_tables(5); - - std::pair<const Interface_type*, tree> val(interface, NULL_TREE); - std::pair<Interface_method_tables::iterator, bool> ins = (*pimt)->insert(val); - - if (ins.second) - { - // This is a new entry in the hash table. - go_assert(ins.first->second == NULL_TREE); - ins.first->second = gogo->interface_method_table_for_type(interface, - type, - is_pointer); - } - - tree decl = ins.first->second; - if (decl == error_mark_node) - return error_mark_node; - go_assert(decl != NULL_TREE && TREE_CODE(decl) == VAR_DECL); - return build_fold_addr_expr(decl); -} - -// Look for field or method NAME for TYPE. Return an Expression for -// the field or method bound to EXPR. If there is no such field or -// method, give an appropriate error and return an error expression. - -Expression* -Type::bind_field_or_method(Gogo* gogo, const Type* type, Expression* expr, - const std::string& name, - Location location) -{ - if (type->deref()->is_error_type()) - return Expression::make_error(location); - - const Named_type* nt = type->deref()->named_type(); - const Struct_type* st = type->deref()->struct_type(); - const Interface_type* it = type->interface_type(); - - // If this is a pointer to a pointer, then it is possible that the - // pointed-to type has methods. - bool dereferenced = false; - if (nt == NULL - && st == NULL - && it == NULL - && type->points_to() != NULL - && type->points_to()->points_to() != NULL) - { - expr = Expression::make_unary(OPERATOR_MULT, expr, location); - type = type->points_to(); - if (type->deref()->is_error_type()) - return Expression::make_error(location); - nt = type->points_to()->named_type(); - st = type->points_to()->struct_type(); - dereferenced = true; - } - - bool receiver_can_be_pointer = (expr->type()->points_to() != NULL - || expr->is_addressable()); - std::vector<const Named_type*> seen; - bool is_method = false; - bool found_pointer_method = false; - std::string ambig1; - std::string ambig2; - if (Type::find_field_or_method(type, name, receiver_can_be_pointer, - &seen, NULL, &is_method, - &found_pointer_method, &ambig1, &ambig2)) - { - Expression* ret; - if (!is_method) - { - go_assert(st != NULL); - if (type->struct_type() == NULL) - { - go_assert(type->points_to() != NULL); - expr = Expression::make_unary(OPERATOR_MULT, expr, - location); - go_assert(expr->type()->struct_type() == st); - } - ret = st->field_reference(expr, name, location); - } - else if (it != NULL && it->find_method(name) != NULL) - ret = Expression::make_interface_field_reference(expr, name, - location); - else - { - Method* m; - if (nt != NULL) - m = nt->method_function(name, NULL); - else if (st != NULL) - m = st->method_function(name, NULL); - else - go_unreachable(); - go_assert(m != NULL); - if (dereferenced && m->is_value_method()) - { - error_at(location, - "calling value method requires explicit dereference"); - return Expression::make_error(location); - } - if (!m->is_value_method() && expr->type()->points_to() == NULL) - expr = Expression::make_unary(OPERATOR_AND, expr, location); - ret = m->bind_method(expr, location); - } - go_assert(ret != NULL); - return ret; - } - else - { - if (!ambig1.empty()) - error_at(location, "%qs is ambiguous via %qs and %qs", - Gogo::message_name(name).c_str(), ambig1.c_str(), - ambig2.c_str()); - else if (found_pointer_method) - error_at(location, "method requires a pointer receiver"); - else if (nt == NULL && st == NULL && it == NULL) - error_at(location, - ("reference to field %qs in object which " - "has no fields or methods"), - Gogo::message_name(name).c_str()); - else - { - bool is_unexported; - if (!Gogo::is_hidden_name(name)) - is_unexported = false; - else - { - std::string unpacked = Gogo::unpack_hidden_name(name); - seen.clear(); - is_unexported = Type::is_unexported_field_or_method(gogo, type, - unpacked, - &seen); - } - if (is_unexported) - error_at(location, "reference to unexported field or method %qs", - Gogo::message_name(name).c_str()); - else - error_at(location, "reference to undefined field or method %qs", - Gogo::message_name(name).c_str()); - } - return Expression::make_error(location); - } -} - -// Look in TYPE for a field or method named NAME, return true if one -// is found. This looks through embedded anonymous fields and handles -// ambiguity. If a method is found, sets *IS_METHOD to true; -// otherwise, if a field is found, set it to false. If -// RECEIVER_CAN_BE_POINTER is false, then the receiver is a value -// whose address can not be taken. SEEN is used to avoid infinite -// recursion on invalid types. - -// When returning false, this sets *FOUND_POINTER_METHOD if we found a -// method we couldn't use because it requires a pointer. LEVEL is -// used for recursive calls, and can be NULL for a non-recursive call. -// When this function returns false because it finds that the name is -// ambiguous, it will store a path to the ambiguous names in *AMBIG1 -// and *AMBIG2. If the name is not found at all, *AMBIG1 and *AMBIG2 -// will be unchanged. - -// This function just returns whether or not there is a field or -// method, and whether it is a field or method. It doesn't build an -// expression to refer to it. If it is a method, we then look in the -// list of all methods for the type. If it is a field, the search has -// to be done again, looking only for fields, and building up the -// expression as we go. - -bool -Type::find_field_or_method(const Type* type, - const std::string& name, - bool receiver_can_be_pointer, - std::vector<const Named_type*>* seen, - int* level, - bool* is_method, - bool* found_pointer_method, - std::string* ambig1, - std::string* ambig2) -{ - // Named types can have locally defined methods. - const Named_type* nt = type->named_type(); - if (nt == NULL && type->points_to() != NULL) - nt = type->points_to()->named_type(); - if (nt != NULL) - { - Named_object* no = nt->find_local_method(name); - if (no != NULL) - { - if (receiver_can_be_pointer || !Type::method_expects_pointer(no)) - { - *is_method = true; - return true; - } - - // Record that we have found a pointer method in order to - // give a better error message if we don't find anything - // else. - *found_pointer_method = true; - } - - for (std::vector<const Named_type*>::const_iterator p = seen->begin(); - p != seen->end(); - ++p) - { - if (*p == nt) - { - // We've already seen this type when searching for methods. - return false; - } - } - } - - // Interface types can have methods. - const Interface_type* it = type->interface_type(); - if (it != NULL && it->find_method(name) != NULL) - { - *is_method = true; - return true; - } - - // Struct types can have fields. They can also inherit fields and - // methods from anonymous fields. - const Struct_type* st = type->deref()->struct_type(); - if (st == NULL) - return false; - const Struct_field_list* fields = st->fields(); - if (fields == NULL) - return false; - - if (nt != NULL) - seen->push_back(nt); - - int found_level = 0; - bool found_is_method = false; - std::string found_ambig1; - std::string found_ambig2; - const Struct_field* found_parent = NULL; - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - { - if (pf->is_field_name(name)) - { - *is_method = false; - if (nt != NULL) - seen->pop_back(); - return true; - } - - if (!pf->is_anonymous()) - continue; - - if (pf->type()->deref()->is_error_type() - || pf->type()->deref()->is_undefined()) - continue; - - Named_type* fnt = pf->type()->named_type(); - if (fnt == NULL) - fnt = pf->type()->deref()->named_type(); - go_assert(fnt != NULL); - - int sublevel = level == NULL ? 1 : *level + 1; - bool sub_is_method; - std::string subambig1; - std::string subambig2; - bool subfound = Type::find_field_or_method(fnt, - name, - receiver_can_be_pointer, - seen, - &sublevel, - &sub_is_method, - found_pointer_method, - &subambig1, - &subambig2); - if (!subfound) - { - if (!subambig1.empty()) - { - // The name was found via this field, but is ambiguous. - // if the ambiguity is lower or at the same level as - // anything else we have already found, then we want to - // pass the ambiguity back to the caller. - if (found_level == 0 || sublevel <= found_level) - { - found_ambig1 = (Gogo::message_name(pf->field_name()) - + '.' + subambig1); - found_ambig2 = (Gogo::message_name(pf->field_name()) - + '.' + subambig2); - found_level = sublevel; - } - } - } - else - { - // The name was found via this field. Use the level to see - // if we want to use this one, or whether it introduces an - // ambiguity. - if (found_level == 0 || sublevel < found_level) - { - found_level = sublevel; - found_is_method = sub_is_method; - found_ambig1.clear(); - found_ambig2.clear(); - found_parent = &*pf; - } - else if (sublevel > found_level) - ; - else if (found_ambig1.empty()) - { - // We found an ambiguity. - go_assert(found_parent != NULL); - found_ambig1 = Gogo::message_name(found_parent->field_name()); - found_ambig2 = Gogo::message_name(pf->field_name()); - } - else - { - // We found an ambiguity, but we already know of one. - // Just report the earlier one. - } - } - } - - // Here if we didn't find anything FOUND_LEVEL is 0. If we found - // something ambiguous, FOUND_LEVEL is not 0 and FOUND_AMBIG1 and - // FOUND_AMBIG2 are not empty. If we found the field, FOUND_LEVEL - // is not 0 and FOUND_AMBIG1 and FOUND_AMBIG2 are empty. - - if (nt != NULL) - seen->pop_back(); - - if (found_level == 0) - return false; - else if (!found_ambig1.empty()) - { - go_assert(!found_ambig1.empty()); - ambig1->assign(found_ambig1); - ambig2->assign(found_ambig2); - if (level != NULL) - *level = found_level; - return false; - } - else - { - if (level != NULL) - *level = found_level; - *is_method = found_is_method; - return true; - } -} - -// Return whether NAME is an unexported field or method for TYPE. - -bool -Type::is_unexported_field_or_method(Gogo* gogo, const Type* type, - const std::string& name, - std::vector<const Named_type*>* seen) -{ - const Named_type* nt = type->named_type(); - if (nt == NULL) - nt = type->deref()->named_type(); - if (nt != NULL) - { - if (nt->is_unexported_local_method(gogo, name)) - return true; - - for (std::vector<const Named_type*>::const_iterator p = seen->begin(); - p != seen->end(); - ++p) - { - if (*p == nt) - { - // We've already seen this type. - return false; - } - } - } - - const Interface_type* it = type->interface_type(); - if (it != NULL && it->is_unexported_method(gogo, name)) - return true; - - type = type->deref(); - - const Struct_type* st = type->struct_type(); - if (st != NULL && st->is_unexported_local_field(gogo, name)) - return true; - - if (st == NULL) - return false; - - const Struct_field_list* fields = st->fields(); - if (fields == NULL) - return false; - - if (nt != NULL) - seen->push_back(nt); - - for (Struct_field_list::const_iterator pf = fields->begin(); - pf != fields->end(); - ++pf) - { - if (pf->is_anonymous() - && !pf->type()->deref()->is_error_type() - && !pf->type()->deref()->is_undefined()) - { - Named_type* subtype = pf->type()->named_type(); - if (subtype == NULL) - subtype = pf->type()->deref()->named_type(); - if (subtype == NULL) - { - // This is an error, but it will be diagnosed elsewhere. - continue; - } - if (Type::is_unexported_field_or_method(gogo, subtype, name, seen)) - { - if (nt != NULL) - seen->pop_back(); - return true; - } - } - } - - if (nt != NULL) - seen->pop_back(); - - return false; -} - -// Class Forward_declaration. - -Forward_declaration_type::Forward_declaration_type(Named_object* named_object) - : Type(TYPE_FORWARD), - named_object_(named_object->resolve()), warned_(false) -{ - go_assert(this->named_object_->is_unknown() - || this->named_object_->is_type_declaration()); -} - -// Return the named object. - -Named_object* -Forward_declaration_type::named_object() -{ - return this->named_object_->resolve(); -} - -const Named_object* -Forward_declaration_type::named_object() const -{ - return this->named_object_->resolve(); -} - -// Return the name of the forward declared type. - -const std::string& -Forward_declaration_type::name() const -{ - return this->named_object()->name(); -} - -// Warn about a use of a type which has been declared but not defined. - -void -Forward_declaration_type::warn() const -{ - Named_object* no = this->named_object_->resolve(); - if (no->is_unknown()) - { - // The name was not defined anywhere. - if (!this->warned_) - { - error_at(this->named_object_->location(), - "use of undefined type %qs", - no->message_name().c_str()); - this->warned_ = true; - } - } - else if (no->is_type_declaration()) - { - // The name was seen as a type, but the type was never defined. - if (no->type_declaration_value()->using_type()) - { - error_at(this->named_object_->location(), - "use of undefined type %qs", - no->message_name().c_str()); - this->warned_ = true; - } - } - else - { - // The name was defined, but not as a type. - if (!this->warned_) - { - error_at(this->named_object_->location(), "expected type"); - this->warned_ = true; - } - } -} - -// Get the base type of a declaration. This gives an error if the -// type has not yet been defined. - -Type* -Forward_declaration_type::real_type() -{ - if (this->is_defined()) - return this->named_object()->type_value(); - else - { - this->warn(); - return Type::make_error_type(); - } -} - -const Type* -Forward_declaration_type::real_type() const -{ - if (this->is_defined()) - return this->named_object()->type_value(); - else - { - this->warn(); - return Type::make_error_type(); - } -} - -// Return whether the base type is defined. - -bool -Forward_declaration_type::is_defined() const -{ - return this->named_object()->is_type(); -} - -// Add a method. This is used when methods are defined before the -// type. - -Named_object* -Forward_declaration_type::add_method(const std::string& name, - Function* function) -{ - Named_object* no = this->named_object(); - if (no->is_unknown()) - no->declare_as_type(); - return no->type_declaration_value()->add_method(name, function); -} - -// Add a method declaration. This is used when methods are declared -// before the type. - -Named_object* -Forward_declaration_type::add_method_declaration(const std::string& name, - Package* package, - Function_type* type, - Location location) -{ - Named_object* no = this->named_object(); - if (no->is_unknown()) - no->declare_as_type(); - Type_declaration* td = no->type_declaration_value(); - return td->add_method_declaration(name, package, type, location); -} - -// Traversal. - -int -Forward_declaration_type::do_traverse(Traverse* traverse) -{ - if (this->is_defined() - && Type::traverse(this->real_type(), traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - return TRAVERSE_CONTINUE; -} - -// Verify the type. - -bool -Forward_declaration_type::do_verify() -{ - if (!this->is_defined() && !this->is_nil_constant_as_type()) - { - this->warn(); - return false; - } - return true; -} - -// Get the backend representation for the type. - -Btype* -Forward_declaration_type::do_get_backend(Gogo* gogo) -{ - if (this->is_defined()) - return Type::get_named_base_btype(gogo, this->real_type()); - - if (this->warned_) - return gogo->backend()->error_type(); - - // We represent an undefined type as a struct with no fields. That - // should work fine for the backend, since the same case can arise - // in C. - std::vector<Backend::Btyped_identifier> fields; - Btype* bt = gogo->backend()->struct_type(fields); - return gogo->backend()->named_type(this->name(), bt, - this->named_object()->location()); -} - -// Build a type descriptor for a forwarded type. - -Expression* -Forward_declaration_type::do_type_descriptor(Gogo* gogo, Named_type* name) -{ - Location ploc = Linemap::predeclared_location(); - if (!this->is_defined()) - return Expression::make_error(ploc); - else - { - Type* t = this->real_type(); - if (name != NULL) - return this->named_type_descriptor(gogo, t, name); - else - return Expression::make_type_descriptor(t, ploc); - } -} - -// The reflection string. - -void -Forward_declaration_type::do_reflection(Gogo* gogo, std::string* ret) const -{ - this->append_reflection(this->real_type(), gogo, ret); -} - -// The mangled name. - -void -Forward_declaration_type::do_mangled_name(Gogo* gogo, std::string* ret) const -{ - if (this->is_defined()) - this->append_mangled_name(this->real_type(), gogo, ret); - else - { - const Named_object* no = this->named_object(); - std::string name; - if (no->package() == NULL) - name = gogo->pkgpath_symbol(); - else - name = no->package()->pkgpath_symbol(); - name += '.'; - name += Gogo::unpack_hidden_name(no->name()); - char buf[20]; - snprintf(buf, sizeof buf, "N%u_", - static_cast<unsigned int>(name.length())); - ret->append(buf); - ret->append(name); - } -} - -// Export a forward declaration. This can happen when a defined type -// refers to a type which is only declared (and is presumably defined -// in some other file in the same package). - -void -Forward_declaration_type::do_export(Export*) const -{ - // If there is a base type, that should be exported instead of this. - go_assert(!this->is_defined()); - - // We don't output anything. -} - -// Make a forward declaration. - -Type* -Type::make_forward_declaration(Named_object* named_object) -{ - return new Forward_declaration_type(named_object); -} - -// Class Typed_identifier_list. - -// Sort the entries by name. - -struct Typed_identifier_list_sort -{ - public: - bool - operator()(const Typed_identifier& t1, const Typed_identifier& t2) const - { return t1.name() < t2.name(); } -}; - -void -Typed_identifier_list::sort_by_name() -{ - std::sort(this->entries_.begin(), this->entries_.end(), - Typed_identifier_list_sort()); -} - -// Traverse types. - -int -Typed_identifier_list::traverse(Traverse* traverse) -{ - for (Typed_identifier_list::const_iterator p = this->begin(); - p != this->end(); - ++p) - { - if (Type::traverse(p->type(), traverse) == TRAVERSE_EXIT) - return TRAVERSE_EXIT; - } - return TRAVERSE_CONTINUE; -} - -// Copy the list. - -Typed_identifier_list* -Typed_identifier_list::copy() const -{ - Typed_identifier_list* ret = new Typed_identifier_list(); - for (Typed_identifier_list::const_iterator p = this->begin(); - p != this->end(); - ++p) - ret->push_back(Typed_identifier(p->name(), p->type(), p->location())); - return ret; -} |