compiler: Define and use backend-independent Location class.

From Sanjoy Das.

	* go-location.h: New file.
	* go-linemap.cc: New file.
	* go-gcc.cc: Change all uses of source_location to Location.
	* Make-lang.in (GO_OBJS): Add go/go-linemap.o.
	(GO_LINEMAP_H): New variable.
	(GO_LEX_H): Use $(GO_LINEMAP_H).
	(GO_GOGO_H, GO_TYPES_H, GO_IMPORT_H): Likewise.
	(go/go-linemap.o): New target.

Co-Authored-By: Ian Lance Taylor <iant@google.com>

From-SVN: r181813

1 files changed, 126 insertions, 0 deletions

diff --git a/gcc/go/go-linemap.cc b/gcc/go/go-linemap.cc
new file mode 100644
index 0000000..b41559e
--- /dev/null
+++ b/gcc/go/go-linemap.cc
@@ -0,0 +1,126 @@
+// 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;
+}