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// go-linemap.cc -- GCC implementation of Linemap.
// Copyright 2011 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-linemap.h"
#include "go-gcc.h"
// This class implements the Linemap interface defined by the
// frontend.
class Gcc_linemap : public Linemap
{
public:
Gcc_linemap()
: Linemap(),
in_file_(false)
{ }
void
start_file(const char* file_name, unsigned int line_begin);
void
start_line(unsigned int line_number, unsigned int line_size);
Location
get_location(unsigned int column);
void
stop();
std::string
to_string(Location);
std::string
location_file(Location);
int
location_line(Location);
protected:
Location
get_predeclared_location();
Location
get_unknown_location();
bool
is_predeclared(Location);
bool
is_unknown(Location);
private:
// Whether we are currently reading a file.
bool in_file_;
};
Linemap* Linemap::instance_ = NULL;
// Start getting locations from a new file.
void
Gcc_linemap::start_file(const char *file_name, unsigned line_begin)
{
if (this->in_file_)
linemap_add(line_table, LC_LEAVE, 0, NULL, 0);
linemap_add(line_table, LC_ENTER, 0, file_name, line_begin);
this->in_file_ = true;
}
// Stringify a location
std::string
Gcc_linemap::to_string(Location location)
{
const line_map_ordinary *lmo;
location_t resolved_location;
// Screen out unknown and predeclared locations; produce output
// only for simple file:line locations.
resolved_location =
linemap_resolve_location (line_table, location.gcc_location(),
LRK_SPELLING_LOCATION, &lmo);
if (lmo == NULL || resolved_location < RESERVED_LOCATION_COUNT)
return "";
const char *path = LINEMAP_FILE (lmo);
if (!path)
return "";
// Strip the source file down to the base file, to reduce clutter.
std::stringstream ss;
ss << lbasename(path) << ":" << SOURCE_LINE (lmo, location.gcc_location());
return ss.str();
}
// Return the file name for a given location.
std::string
Gcc_linemap::location_file(Location loc)
{
return LOCATION_FILE(loc.gcc_location());
}
// Return the line number for a given location.
int
Gcc_linemap::location_line(Location loc)
{
return LOCATION_LINE(loc.gcc_location());
}
// Stop getting locations.
void
Gcc_linemap::stop()
{
linemap_add(line_table, LC_LEAVE, 0, NULL, 0);
this->in_file_ = false;
}
// Start a new line.
void
Gcc_linemap::start_line(unsigned lineno, unsigned linesize)
{
linemap_line_start(line_table, lineno, linesize);
}
// Get a location.
Location
Gcc_linemap::get_location(unsigned column)
{
return Location(linemap_position_for_column(line_table, column));
}
// Get the unknown location.
Location
Gcc_linemap::get_unknown_location()
{
return Location(UNKNOWN_LOCATION);
}
// Get the predeclared location.
Location
Gcc_linemap::get_predeclared_location()
{
return Location(BUILTINS_LOCATION);
}
// Return whether a location is the predeclared location.
bool
Gcc_linemap::is_predeclared(Location loc)
{
return loc.gcc_location() == BUILTINS_LOCATION;
}
// Return whether a location is the unknown location.
bool
Gcc_linemap::is_unknown(Location loc)
{
return loc.gcc_location() == UNKNOWN_LOCATION;
}
// Return the Linemap to use for the gcc backend.
Linemap*
go_get_linemap()
{
return new Gcc_linemap;
}
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