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// export.h -- Export declarations in Go frontend. -*- C++ -*-
// 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.
#ifndef GO_EXPORT_H
#define GO_EXPORT_H
#include "string-dump.h"
struct sha1_ctx;
class Gogo;
class Import_init;
class Bindings;
class Type;
class Package;
// Codes used for the builtin types. These are all negative to make
// them easily distinct from the codes assigned by Export::write_type.
// Note that these codes may not be changed! Changing them would
// break existing export data.
enum Builtin_code
{
BUILTIN_INT8 = -1,
BUILTIN_INT16 = -2,
BUILTIN_INT32 = -3,
BUILTIN_INT64 = -4,
BUILTIN_UINT8 = -5,
BUILTIN_UINT16 = -6,
BUILTIN_UINT32 = -7,
BUILTIN_UINT64 = -8,
BUILTIN_FLOAT32 = -9,
BUILTIN_FLOAT64 = -10,
BUILTIN_INT = -11,
BUILTIN_UINT = -12,
BUILTIN_UINTPTR = -13,
BUILTIN_BOOL = -15,
BUILTIN_STRING = -16,
BUILTIN_COMPLEX64 = -17,
BUILTIN_COMPLEX128 = -18,
BUILTIN_ERROR = -19,
BUILTIN_BYTE = -20,
BUILTIN_RUNE = -21,
SMALLEST_BUILTIN_CODE = -21
};
// This class manages exporting Go declarations. It handles the main
// loop of exporting. A pointer to this class is also passed to the
// various specific export implementations.
class Export : public String_dump
{
public:
// The Stream class is an interface used to output the exported
// information. The caller should instantiate a child of this
// class.
class Stream
{
public:
Stream();
virtual ~Stream();
// Write a string. Implements the String_dump interface.
void
write_string(const std::string& s)
{ this->write_and_sum_bytes(s.data(), s.length()); }
// Write a nul terminated string. Implements the String_dump interface.
void
write_c_string(const char* s)
{ this->write_and_sum_bytes(s, strlen(s)); }
// Write some bytes.
void
write_bytes(const char* bytes, size_t length)
{ this->write_and_sum_bytes(bytes, length); }
// Return the raw bytes of the checksum data.
std::string
checksum();
// Write a checksum string to the stream. This will be called at
// the end of the other output.
void
write_checksum(const std::string&);
protected:
// This function is called with data to export. This data must be
// made available as a contiguous stream for the importer.
virtual void
do_write(const char* bytes, size_t length) = 0;
private:
void
write_and_sum_bytes(const char*, size_t);
// The checksum.
sha1_ctx* checksum_;
};
Export(Stream*);
// The magic code for version 1 export data.
static const int v1_magic_len = 4;
static const char v1_magic[v1_magic_len];
// The length of the v1 checksum string.
static const int v1_checksum_len = 20;
// Register the builtin types.
void
register_builtin_types(Gogo*);
// Export the identifiers in BINDINGS which are marked for export.
// The exporting is done via a series of calls to THIS->STREAM_. If
// is nothing to export, this->stream_->write will not be called.
// PKGPATH is the package path.
// PACKAGE_PRIORITY is the priority to use for this package.
// IMPORT_INIT_FN is the name of the import initialization function
// for this package; it will be empty if none is needed.
// IMPORTED_INIT_FNS is the list of initialization functions for
// imported packages.
void
export_globals(const std::string& package_name,
const std::string& pkgpath,
int package_priority,
const std::map<std::string, Package*>& imports,
const std::string& import_init_fn,
const std::set<Import_init>& imported_init_fns,
const Bindings* bindings);
// Write a string to the export stream.
void
write_string(const std::string& s)
{ this->stream_->write_string(s); }
// Write a nul terminated string to the export stream.
void
write_c_string(const char* s)
{ this->stream_->write_c_string(s); }
// Write some bytes to the export stream.
void
write_bytes(const char* bytes, size_t length)
{ this->stream_->write_bytes(bytes, length); }
// Write a name to the export stream. If NAME is empty, write "?".
void
write_name(const std::string& name);
// Write out a type. This handles references back to previous
// definitions.
void
write_type(const Type*);
private:
Export(const Export&);
Export& operator=(const Export&);
// Write out the imported packages.
void
write_imports(const std::map<std::string, Package*>& imports);
// Write out the imported initialization functions.
void
write_imported_init_fns(const std::string& package_name, int priority,
const std::string&, const std::set<Import_init>&);
// Register one builtin type.
void
register_builtin_type(Gogo*, const char* name, Builtin_code);
// Mapping from Type objects to a constant index.
typedef Unordered_map(const Type*, int) Type_refs;
// The stream to which we are writing data.
Stream* stream_;
// Type mappings.
Type_refs type_refs_;
// Index number of next type.
int type_index_;
// Packages we have written out.
Unordered_set(const Package*) packages_;
};
// An export streamer which puts the export stream in a named section.
class Stream_to_section : public Export::Stream
{
public:
Stream_to_section();
protected:
void
do_write(const char*, size_t);
};
#endif // !defined(GO_EXPORT_H)
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