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, 45 insertions, 0 deletions

diff --git a/gcc/go/go-location.h b/gcc/go/go-location.h
new file mode 100644
index 0000000..f2731d9
--- /dev/null
+++ b/gcc/go/go-location.h
@@ -0,0 +1,45 @@
+// go-location.h -- GCC specific Location declaration.   -*- C++ -*-
+
+// 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.
+
+#ifndef GO_LOCATION_H
+#define GO_LOCATION_H
+
+#include "go-system.h"
+
+// A location in an input source file.
+
+class Location
+{
+ public:
+  Location()
+    : gcc_loc_(UNKNOWN_LOCATION)
+  { }
+
+  explicit Location(source_location loc)
+    : gcc_loc_(loc)
+  { }
+
+  source_location
+  gcc_location() const
+  { return this->gcc_loc_; }
+
+  // Temporary hack till error_at and warning_at can deal with a Location.
+  operator source_location() const
+  { return this->gcc_loc_; }
+
+ private:
+  source_location gcc_loc_;
+};
+
+// The Go frontend requires the ability to compare Locations.
+
+inline bool
+operator<(Location loca, Location locb)
+{
+  return loca.gcc_location() < locb.gcc_location();
+}
+
+#endif // !defined(GO_LOCATION_H)