1 files changed, 48 insertions, 2 deletions

diff --git a/gcc/go/gofrontend/gogo.cc b/gcc/go/gofrontend/gogo.cc
index 9197eef..fa3cd6e 100644
--- a/gcc/go/gofrontend/gogo.cc
+++ b/gcc/go/gofrontend/gogo.cc
@@ -52,6 +52,10 @@ Gogo::Gogo(Backend* backend, Linemap* linemap, int, int pointer_size)
     prefix_from_option_(false),
     relative_import_path_(),
     c_header_(),
+    import_map_(),
+    package_file_(),
+    embed_patterns_(),
+    embed_files_(),
     check_divide_by_zero_(true),
     check_divide_overflow_(true),
     compiling_runtime_(false),
@@ -517,7 +521,20 @@ Gogo::import_package(const std::string& filename,
       return;
     }
 
-  Import::Stream* stream = Import::open_package(filename, location,
+  // If we are using an importcfg file we have to check two mappings.
+  // IMPORT_MAP_ is a mapping from package path to real package path,
+  // for vendoring.  PACKAGE_FILE_ is a mapping from package path to
+  // file name, to find the file in the build cache.
+  std::string path = filename;
+  Unordered_map(std::string, std::string)::const_iterator pi;
+  pi = this->import_map_.find(filename);
+  if (pi != this->import_map_.end())
+    path = pi->second;
+  pi = this->package_file_.find(path);
+  if (pi != this->package_file_.end())
+    path = pi->second;
+
+  Import::Stream* stream = Import::open_package(path, location,
 						this->relative_import_path_);
   if (stream == NULL)
     {
@@ -3296,6 +3313,9 @@ class Create_function_descriptors : public Traverse
   int
   expression(Expression**);
 
+  static bool
+  skip_descriptor(Gogo* gogo, const Named_object*);
+
  private:
   Gogo* gogo_;
 };
@@ -3306,6 +3326,9 @@ class Create_function_descriptors : public Traverse
 int
 Create_function_descriptors::function(Named_object* no)
 {
+  if (Create_function_descriptors::skip_descriptor(this->gogo_, no))
+    return TRAVERSE_CONTINUE;
+
   if (no->is_function()
       && no->func_value()->enclosing() == NULL
       && !no->func_value()->is_method()
@@ -3393,6 +3416,28 @@ Create_function_descriptors::expression(Expression** pexpr)
   return TRAVERSE_CONTINUE;
 }
 
+// The gc compiler has some special cases that it always compiles as
+// intrinsics.  For those we don't want to generate a function
+// descriptor, as there will be no code for it to refer to.
+
+bool
+Create_function_descriptors::skip_descriptor(Gogo* gogo,
+					     const Named_object* no)
+{
+  const std::string& pkgpath(no->package() == NULL
+			     ? gogo->pkgpath()
+			     : no->package()->pkgpath());
+
+  // internal/abi is the standard library package,
+  // bootstrap/internal/abi is the name used when bootstrapping the gc
+  // compiler.
+
+  return ((pkgpath == "internal/abi"
+	   || pkgpath == "bootstrap/internal/abi")
+	  && (no->name() == "FuncPCABI0"
+	      || no->name() == "FuncPCABIInternal"));
+}
+
 // Create function descriptors as needed.  We need a function
 // descriptor for all exported functions and for all functions that
 // are referenced without being called.
@@ -3414,7 +3459,8 @@ Gogo::create_function_descriptors()
       if (no->is_function_declaration()
 	  && !no->func_declaration_value()->type()->is_method()
 	  && !Linemap::is_predeclared_location(no->location())
-	  && !Gogo::is_hidden_name(no->name()))
+	  && !Gogo::is_hidden_name(no->name())
+	  && !Create_function_descriptors::skip_descriptor(this, no))
 	fndecls.push_back(no);
     }
   for (std::vector<Named_object*>::const_iterator p = fndecls.begin();