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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"

// 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();

 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;

}

// 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;

}