compiler: add src information to AST dumps (part 1 of 2).

    
    When emitting AST dumps, tag the end of selected statements with with
    source file and line number information where available. Example:
    
      tmp.76832448 = 0 // p.go:6
    
    Requires a corresponding change in gcc/go as well as this change to
    gofrontend.
    
    Reviewed-on: https://go-review.googlesource.com/29856

	* go-linemap.cc (Gcc_linemap::to_string): New method.

From-SVN: r240558

1 files changed, 14 insertions, 1 deletions

diff --git a/gcc/go/gofrontend/go-linemap.h b/gcc/go/gofrontend/go-linemap.h
index ffbcbe7..d60cff6 100644
--- a/gcc/go/gofrontend/go-linemap.h
+++ b/gcc/go/gofrontend/go-linemap.h
@@ -17,7 +17,6 @@
 // The type is normally passed by value rather than by reference, and
 // it should support that efficiently.  The type should be defined in
 // "go-location.h".
-
 #include "go-location.h"
 
 // The Linemap class is a pure abstract interface, plus some static
@@ -58,6 +57,12 @@ class Linemap
   virtual void
   stop() = 0;
 
+  // Produce a human-readable description of a Location, e.g.
+  // "foo.go:10". Returns an empty string for predeclared, builtin or
+  // unknown locations.
+  virtual std::string
+  to_string(Location) = 0;
+
  protected:
   // Return a special Location used for predeclared identifiers.  This
   // Location should be different from that for any actual source
@@ -122,6 +127,14 @@ class Linemap
     go_assert(Linemap::instance_ != NULL);
     return Linemap::instance_->is_unknown(loc);
   }
+
+  // Produce a human-readable description of a Location.
+  static std::string
+  location_to_string(Location loc)
+  {
+    go_assert(Linemap::instance_ != NULL);
+    return Linemap::instance_->to_string(loc);
+  }
 };
 
 // The backend interface must define this function.  It should return