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// rust-linemap.cc -- GCC implementation of Linemap.
#include "rust-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 ();
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 ())
<< ":" << SOURCE_COLUMN (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 *
rust_get_linemap ()
{
return new Gcc_linemap;
}
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