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+/* This file contains the definitions and documentation for the
+ additional tree codes used in the GNU C++ compiler (see tree.def
+ for the standard codes).
+ Copyright (C) 1987-2014 Free Software Foundation, Inc.
+ Hacked by Michael Tiemann (tiemann@cygnus.com)
+This file is part of GCC.
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+/* An OFFSET_REF is used in two situations:
+ 1. An expression of the form `A::m' where `A' is a class and `m' is
+ a non-static member. In this case, operand 0 will be a TYPE
+ (corresponding to `A') and operand 1 will be a FIELD_DECL,
+ BASELINK, or TEMPLATE_ID_EXPR (corresponding to `m').
+ The expression is a pointer-to-member if its address is taken,
+ but simply denotes a member of the object if its address is not
+ taken.
+ This form is only used during the parsing phase; once semantic
+ analysis has taken place they are eliminated.
+ 2. An expression of the form `x.*p'. In this case, operand 0 will
+ be an expression corresponding to `x' and operand 1 will be an
+ expression with pointer-to-member type. */
+DEFTREECODE (OFFSET_REF, "offset_ref", tcc_reference, 2)
+/* A pointer-to-member constant. For a pointer-to-member constant
+ `X::Y' The PTRMEM_CST_CLASS is the RECORD_TYPE for `X' and the
+ PTRMEM_CST_MEMBER is the _DECL for `Y'. */
+DEFTREECODE (PTRMEM_CST, "ptrmem_cst", tcc_constant, 0)
+/* For NEW_EXPR, operand 0 is the placement list.
+ Operand 1 is the new-declarator.
+ Operand 2 is the number of elements in the array.
+ Operand 3 is the initializer. */
+DEFTREECODE (NEW_EXPR, "nw_expr", tcc_expression, 4)
+DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", tcc_expression, 3)
+/* For DELETE_EXPR, operand 0 is the store to be destroyed.
+ Operand 1 is the value to pass to the destroying function
+ saying whether the store should be deallocated as well. */
+DEFTREECODE (DELETE_EXPR, "dl_expr", tcc_expression, 2)
+DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", tcc_expression, 2)
+/* Value is reference to particular overloaded class method.
+ Operand 0 is the class, operand 1 is the field
+ The COMPLEXITY field holds the class level (usually 0). */
+DEFTREECODE (SCOPE_REF, "scope_ref", tcc_reference, 2)
+/* When composing an object with a member, this is the result.
+ Operand 0 is the object. Operand 1 is the member (usually
+ a dereferenced pointer to member). */
+DEFTREECODE (MEMBER_REF, "member_ref", tcc_reference, 2)
+/* Type conversion operator in C++. TREE_TYPE is type that this
+ operator converts to. Operand is expression to be converted. */
+DEFTREECODE (TYPE_EXPR, "type_expr", tcc_expression, 1)
+/* AGGR_INIT_EXPRs have a variably-sized representation similar to
+ that of CALL_EXPRs. Operand 0 is an INTEGER_CST node containing the
+ operand count, operand 1 is the function which performs initialization,
+ operand 2 is the slot which was allocated for this expression, and
+ the remaining operands are the arguments to the initialization function. */
+DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", tcc_vl_exp, 3)
+/* Initialization of an array from another array, expressed at a high level
+ so that it works with TARGET_EXPR. Operand 0 is the target, operand 1
+ is the initializer. */
+DEFTREECODE (VEC_INIT_EXPR, "vec_init_expr", tcc_expression, 2)
+/* A throw expression. operand 0 is the expression, if there was one,
+ else it is NULL_TREE. */
+DEFTREECODE (THROW_EXPR, "throw_expr", tcc_expression, 1)
+/* An empty class object. The TREE_TYPE gives the class type. We use
+ these to avoid actually creating instances of the empty classes. */
+DEFTREECODE (EMPTY_CLASS_EXPR, "empty_class_expr", tcc_expression, 0)
+/* A reference to a member function or member functions from a base
+ functions. BASELINK_BINFO gives the base from which the functions
+ come, i.e., the base to which the `this' pointer must be converted
+ before the functions are called. BASELINK_ACCESS_BINFO gives the
+ base used to name the functions.
+ A BASELINK is an expression; the TREE_TYPE of the BASELINK gives
+ the type of the expression. This type is either a FUNCTION_TYPE,
+ METHOD_TYPE, or `unknown_type_node' indicating that the function is
+ overloaded. */
+DEFTREECODE (BASELINK, "baselink", tcc_exceptional, 0)
+/* Template definition. The following fields have the specified uses,
+ although there are other macros in cp-tree.h that should be used for
+ accessing this data.
+ DECL_ARGUMENTS template parm vector
+ DECL_TEMPLATE_INFO template text &c
+ DECL_VINDEX list of instantiations already produced;
+ only done for functions so far
+ For class template:
+ DECL_INITIAL associated templates (methods &c)
+ For non-class templates:
+ TREE_TYPE type of object to be constructed
+ DECL_TEMPLATE_RESULT decl for object to be created
+ (e.g., FUNCTION_DECL with tmpl parms used)
+ */
+DEFTREECODE (TEMPLATE_DECL, "template_decl", tcc_declaration, 0)
+/* Index into a template parameter list. The TEMPLATE_PARM_IDX gives
+ the index (from 0) of the parameter, while the TEMPLATE_PARM_LEVEL
+ gives the level (from 1) of the parameter.
+ Here's an example:
+ template <class T> // Index 0, Level 1.
+ struct S
+ {
+ template <class U, // Index 0, Level 2.
+ class V> // Index 1, Level 2.
+ void f();
+ };
+ The DESCENDANTS will be a chain of TEMPLATE_PARM_INDEXs descended
+ from this one. The first descendant will have the same IDX, but
+ its LEVEL will be one less. The TREE_CHAIN field is used to chain
+ together the descendants. The TEMPLATE_PARM_DECL is the
+ declaration of this parameter, either a TYPE_DECL or CONST_DECL.
+ The TEMPLATE_PARM_ORIG_LEVEL is the LEVEL of the most distant
+ parent, i.e., the LEVEL that the parameter originally had when it
+ was declared. For example, if we instantiate S<int>, we will have:
+ struct S<int>
+ {
+ template <class U, // Index 0, Level 1, Orig Level 2
+ class V> // Index 1, Level 1, Orig Level 2
+ void f();
+ };
+ The LEVEL is the level of the parameter when we are worrying about
+ the types of things; the ORIG_LEVEL is the level when we are
+ worrying about instantiating things. */
+DEFTREECODE (TEMPLATE_PARM_INDEX, "template_parm_index", tcc_exceptional, 0)
+/* Index into a template parameter list for template template parameters.
+ This parameter must be a type. The TYPE_FIELDS value will be a
+ It is used without template arguments like TT in C<TT>,
+DEFTREECODE (TEMPLATE_TEMPLATE_PARM, "template_template_parm", tcc_type, 0)
+/* The ordering of the following codes is optimized for the checking
+ macros in tree.h. Changing the order will degrade the speed of the
+/* Index into a template parameter list. This parameter must be a type.
+ The type.values field will be a TEMPLATE_PARM_INDEX. */
+DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 0)
+/* A type designated by `typename T::t'. TYPE_CONTEXT is `T',
+ TYPE_NAME is an IDENTIFIER_NODE for `t'. If the type was named via
+ template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR.
+ TREE_TYPE is always NULL. */
+DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0)
+/* A type designated by `__typeof (expr)'. TYPEOF_TYPE_EXPR is the
+ expression in question. */
+DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0)
+/* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
+ like TT<int>.
+ template name and its bound arguments. TYPE_NAME is a TYPE_DECL. */
+DEFTREECODE (BOUND_TEMPLATE_TEMPLATE_PARM, "bound_template_template_parm",
+ tcc_type, 0)
+/* For template template argument of the form `T::template C'.
+ TYPE_CONTEXT is `T', the template parameter dependent object.
+ TYPE_NAME is an IDENTIFIER_NODE for `C', the member class template. */
+DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", tcc_type, 0)
+/* A using declaration. USING_DECL_SCOPE contains the specified
+ scope. In a member using decl, unless DECL_DEPENDENT_P is true,
+ USING_DECL_DECLS contains the _DECL or OVERLOAD so named. This is
+ not an alias, but is later expanded into multiple aliases. */
+DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0)
+/* A using directive. The operand is USING_STMT_NAMESPACE. */
+DEFTREECODE (USING_STMT, "using_stmt", tcc_statement, 1)
+/* An un-parsed default argument. Holds a vector of input tokens and
+ a vector of places where the argument was instantiated before
+ parsing had occurred. */
+DEFTREECODE (DEFAULT_ARG, "default_arg", tcc_exceptional, 0)
+/* An uninstantiated noexcept-specification. DEFERRED_NOEXCEPT_PATTERN is
+ the pattern from the template, and DEFERRED_NOEXCEPT_ARGS are the
+ template arguments to substitute into the pattern when needed. */
+DEFTREECODE (DEFERRED_NOEXCEPT, "deferred_noexcept", tcc_exceptional, 0)
+/* A template-id, like foo<int>. The first operand is the template.
+ The second is NULL if there are no explicit arguments, or a
+ TREE_VEC of arguments. The template will be a FUNCTION_DECL,
+ TEMPLATE_DECL, or an OVERLOAD. If the template-id refers to a
+ member template, the template may be an IDENTIFIER_NODE. */
+DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2)
+/* A list-like node for chaining overloading candidates. TREE_TYPE is
+ the original name, and the parameter is the FUNCTION_DECL. */
+DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0)
+/* A pseudo-destructor, of the form "OBJECT.~DESTRUCTOR" or
+ "OBJECT.SCOPE::~DESTRUCTOR. The first operand is the OBJECT. The
+ second operand (if non-NULL) is the SCOPE. The third operand is
+ the TYPE node corresponding to the DESTRUCTOR. The type of the
+ first operand will always be a scalar type.
+ The type of a PSEUDO_DTOR_EXPR is always "void", even though it can
+ be used as if it were a zero-argument function. We handle the
+ function-call case specially, and giving it "void" type prevents it
+ being used in expressions in ways that are not permitted. */
+DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3)
+/* A whole bunch of tree codes for the initial, superficial parsing of
+ templates. */
+DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3)
+DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1)
+DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1)
+DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1)
+DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1)
+DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1)
+DEFTREECODE (IMPLICIT_CONV_EXPR, "implicit_conv_expr", tcc_unary, 1)
+DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2)
+DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1)
+DEFTREECODE (NOEXCEPT_EXPR, "noexcept_expr", tcc_unary, 1)
+/* A placeholder for an expression that is not type-dependent, but
+ does occur in a template. When an expression that is not
+ type-dependent appears in a larger expression, we must compute the
+ type of that larger expression. That computation would normally
+ modify the original expression, which would change the mangling of
+ that expression if it appeared in a template argument list. In
+ that situation, we create a NON_DEPENDENT_EXPR to take the place of
+ the original expression. The expression is the only operand -- it
+ is only needed for diagnostics. */
+DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", tcc_expression, 1)
+/* CTOR_INITIALIZER is a placeholder in template code for a call to
+ setup_vtbl_pointer (and appears in all functions, not just ctors). */
+DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1)
+DEFTREECODE (TRY_BLOCK, "try_block", tcc_statement, 2)
+DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_statement, 2)
+/* A HANDLER wraps a catch handler for the HANDLER_TYPE. If this is
+ CATCH_ALL_TYPE, then the handler catches all types. The declaration of
+ the catch variable is in HANDLER_PARMS, and the body block in
+DEFTREECODE (HANDLER, "handler", tcc_statement, 2)
+/* A MUST_NOT_THROW_EXPR wraps an expression that may not
+ throw, and must call terminate if it does. The second argument
+ is a condition, used in templates to express noexcept (condition). */
+DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 2)
+/* A CLEANUP_STMT marks the point at which a declaration is fully
+ constructed. The CLEANUP_EXPR is run on behalf of CLEANUP_DECL
+ when CLEANUP_BODY completes. */
+DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_statement, 3)
+/* Represents an 'if' statement. The operands are IF_COND,
+ THEN_CLAUSE, and ELSE_CLAUSE, and the current scope, respectively. */
+/* ??? It is currently still necessary to distinguish between IF_STMT
+ and COND_EXPR for the benefit of templates. */
+DEFTREECODE (IF_STMT, "if_stmt", tcc_statement, 4)
+/* Used to represent a `for' statement. The operands are
+ FOR_INIT_STMT, FOR_COND, FOR_EXPR, and FOR_BODY, respectively. */
+DEFTREECODE (FOR_STMT, "for_stmt", tcc_statement, 5)
+/* Used to represent a range-based `for' statement. The operands are
+ respectively. Only used in templates. */
+DEFTREECODE (RANGE_FOR_STMT, "range_for_stmt", tcc_statement, 4)
+/* Used to represent a 'while' statement. The operands are WHILE_COND
+ and WHILE_BODY, respectively. */
+DEFTREECODE (WHILE_STMT, "while_stmt", tcc_statement, 2)
+/* Used to represent a 'do' statement. The operands are DO_BODY and
+ DO_COND, respectively. */
+DEFTREECODE (DO_STMT, "do_stmt", tcc_statement, 2)
+/* Used to represent a 'break' statement. */
+DEFTREECODE (BREAK_STMT, "break_stmt", tcc_statement, 0)
+/* Used to represent a 'continue' statement. */
+DEFTREECODE (CONTINUE_STMT, "continue_stmt", tcc_statement, 0)
+/* Used to represent a 'switch' statement. The operands are
+ SWITCH_STMT_SCOPE, respectively. */
+DEFTREECODE (SWITCH_STMT, "switch_stmt", tcc_statement, 4)
+/* Used to represent an expression statement. Use `EXPR_STMT_EXPR' to
+ obtain the expression. */
+DEFTREECODE (EXPR_STMT, "expr_stmt", tcc_expression, 1)
+DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0)
+/* Represents an 'offsetof' expression during template expansion. */
+DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 1)
+/* Represents the -> operator during template expansion. */
+DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1)
+/* Represents an '__alignof__' expression during template
+ expansion. */
+DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_expression, 1)
+/* Represents an Objective-C++ '@encode' expression during template
+ expansion. */
+DEFTREECODE (AT_ENCODE_EXPR, "at_encode_expr", tcc_expression, 1)
+/* A STMT_EXPR represents a statement-expression during template
+ expansion. This is the GCC extension { ( ... ) }. The
+ STMT_EXPR_STMT is the statement given by the expression. */
+DEFTREECODE (STMT_EXPR, "stmt_expr", tcc_expression, 1)
+/* Unary plus. Operand 0 is the expression to which the unary plus
+ is applied. */
+DEFTREECODE (UNARY_PLUS_EXPR, "unary_plus_expr", tcc_unary, 1)
+/** C++0x extensions. */
+/* A static assertion. This is a C++0x extension.
+ STATIC_ASSERT_CONDITION contains the condition that is being
+ checked. STATIC_ASSERT_MESSAGE contains the message (a string
+ literal) to be displayed if the condition fails to hold. */
+DEFTREECODE (STATIC_ASSERT, "static_assert", tcc_exceptional, 0)
+/* Represents an argument pack of types (or templates). An argument
+ pack stores zero or more arguments that will be used to instantiate
+ a parameter pack.
+ ARGUMENT_PACK_ARGS retrieves the arguments stored in the argument
+ pack.
+ Example:
+ template<typename... Values>
+ class tuple { ... };
+ tuple<int, float, double> t;
+ Values is a (template) parameter pack. When tuple<int, float,
+ double> is instantiated, the Values parameter pack is instantiated
+ with the argument pack <int, float, double>. ARGUMENT_PACK_ARGS will
+ be a TREE_VEC containing int, float, and double. */
+DEFTREECODE (TYPE_ARGUMENT_PACK, "type_argument_pack", tcc_type, 0)
+/* Represents an argument pack of values, which can be used either for
+ non-type template arguments or function call arguments.
+ NONTYPE_ARGUMENT_PACK plays precisely the same role as
+ TYPE_ARGUMENT_PACK, but will be used for packing non-type template
+ arguments (e.g., "int... Dimensions") or function arguments ("const
+ Args&... args"). */
+DEFTREECODE (NONTYPE_ARGUMENT_PACK, "nontype_argument_pack", tcc_expression, 1)
+/* Represents a type expression that will be expanded into a list of
+ types when instantiated with one or more argument packs.
+ PACK_EXPANSION_PATTERN retrieves the expansion pattern. This is
+ the type or expression that we will substitute into with each
+ argument in an argument pack.
+ SET_PACK_EXPANSION_PATTERN sets the expansion pattern.
+ PACK_EXPANSION_PARAMETER_PACKS contains a TREE_LIST of the parameter
+ packs that are used in this pack expansion.
+ Example:
+ template<typename... Values>
+ struct tied : tuple<Values&...> {
+ // ...
+ };
+ The derivation from tuple contains a TYPE_PACK_EXPANSION for the
+ template arguments. Its PACK_EXPANSION_PATTERN is "Values&" and its
+ PACK_EXPANSION_PARAMETER_PACKS will contain "Values". */
+DEFTREECODE (TYPE_PACK_EXPANSION, "type_pack_expansion", tcc_type, 0)
+/* Represents an expression that will be expanded into a list of
+ expressions when instantiated with one or more argument packs.
+ EXPR_PACK_EXPANSION plays precisely the same role as TYPE_PACK_EXPANSION,
+ but will be used for expressions. */
+DEFTREECODE (EXPR_PACK_EXPANSION, "expr_pack_expansion", tcc_expression, 3)
+/* Selects the Ith parameter out of an argument pack. This node will
+ be used when instantiating pack expansions; see
+ tsubst_pack_expansion.
+ from which the argument will be selected.
+ ARGUMENT_PACK_SELECT_INDEX contains the index into the argument
+ pack that will be returned by this ARGUMENT_PACK_SELECT node. The
+ index is a machine integer. */
+DEFTREECODE (ARGUMENT_PACK_SELECT, "argument_pack_select", tcc_exceptional, 0)
+/** C++ extensions. */
+/* Represents a trait expression during template expansion. */
+DEFTREECODE (TRAIT_EXPR, "trait_expr", tcc_exceptional, 0)
+/* A lambda expression. This is a C++0x extension.
+ LAMBDA_EXPR_DEFAULT_CAPTURE_MODE is an enum for the default, which may be
+ none.
+ LAMBDA_EXPR_CAPTURE_LIST holds the capture-list, including `this'.
+ LAMBDA_EXPR_THIS_CAPTURE goes straight to the capture of `this', if it exists.
+ LAMBDA_EXPR_PENDING_PROXIES is a vector of capture proxies which need to
+ be pushed once scope returns to the lambda.
+ LAMBDA_EXPR_MUTABLE_P signals whether this lambda was declared mutable.
+ LAMBDA_EXPR_RETURN_TYPE holds the return type, if it was specified. */
+DEFTREECODE (LAMBDA_EXPR, "lambda_expr", tcc_exceptional, 0)
+/* The declared type of an expression. This is a C++0x extension.
+ DECLTYPE_TYPE_EXPR is the expression whose type we are computing.
+ expression was parsed as an id-expression or a member access
+ expression. When false, it was parsed as a full expression.
+ DECLTYPE_FOR_LAMBDA_CAPTURE is set if we want lambda capture semantics.
+ DECLTYPE_FOR_LAMBDA_RETURN is set if we want lambda return deduction. */
+DEFTREECODE (DECLTYPE_TYPE, "decltype_type", tcc_type, 0)
+/* A type designated by `__underlying_type (type)'.
+ UNDERLYING_TYPE_TYPE is the type in question. */
+DEFTREECODE (UNDERLYING_TYPE, "underlying_type", tcc_type, 0)
+/* A type designated by one of the bases type traits.
+ BASES_TYPE is the type in question. */
+DEFTREECODE (BASES, "bases", tcc_type, 0)
+/* Used to represent the template information stored by template
+ specializations.
+ The accessors are:
+ TI_TEMPLATE the template declaration associated to the specialization
+ TI_ARGS the arguments of the template specialization
+ TI_TYPEDEFS_NEEDING_ACCESS_CHECKING the vector of typedefs used in
+ the pattern of the template for which access check is needed at template
+ instantiation time. */
+DEFTREECODE (TEMPLATE_INFO, "template_info", tcc_exceptional, 0)
+Local variables: