compiler: Expose runtime code through Func_expression.

    
    Enables us to easily check if a Call_expression is a call to a runtime
    function and, if so, which runtime function is corresponds to.
    This will be used during escape analysis.
    
    Reviewed-on: https://go-review.googlesource.com/18544

From-SVN: r235383

1 files changed, 36 insertions, 0 deletions

diff --git a/gcc/go/gofrontend/runtime.cc b/gcc/go/gofrontend/runtime.cc
index de68f64..6492025 100644
--- a/gcc/go/gofrontend/runtime.cc
+++ b/gcc/go/gofrontend/runtime.cc
@@ -402,3 +402,39 @@ Runtime::map_iteration_type()
 				Linemap::predeclared_location());
   return Type::make_array_type(runtime_function_type(RFT_POINTER), iexpr);
 }
+
+
+// Get the runtime code for a named builtin function.  This is used as a helper
+// when creating function references for call expressions.  Every reference to
+// a builtin runtime function should have the associated runtime code.  If the
+// name is ambiguous and can refer to many runtime codes, return
+// NUMBER_OF_FUNCTIONS.
+
+Runtime::Function
+Runtime::name_to_code(const std::string& name)
+{
+  Function code = Runtime::NUMBER_OF_FUNCTIONS;
+
+  // Aliases seen in function declaration code.
+  // TODO(cmang): Add other aliases.
+  if (name == "new")
+    code = Runtime::NEW;
+  else if (name == "close")
+    code = Runtime::CLOSE;
+  else if (name == "copy")
+    code = Runtime::COPY;
+  else if (name == "append")
+    code = Runtime::APPEND;
+  else if (name == "delete")
+    code = Runtime::MAPDELETE;
+  else
+    {
+      // Look through the known names for a match.
+      for (size_t i = 0; i < Runtime::NUMBER_OF_FUNCTIONS; i++)
+	{
+	  if (strcmp(runtime_functions[i].name, name.c_str()) == 0)
+	    code = static_cast<Runtime::Function>(i);
+	}
+    }
+  return code;
+}