Add support to trace warnings in TraceBuffer.

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/class_finalizer.h"
@@ skipping 3952 matching lines @@
   ASSERT(found);
 }
 
 
 void FlowGraphBuilder::Warning(intptr_t token_pos,
                                const char* format, ...) const {
   if (FLAG_silent_warnings) return;
   const Function& function = parsed_function_->function();
   va_list args;
   va_start(args, format);
+  const Script& script = Script::Handle(I, function.script());
   const Error& error = Error::Handle(
       I,
       LanguageError::NewFormattedV(
           Error::Handle(I, Error::null()),  // No previous error.
-          Script::Handle(I, function.script()),
-          token_pos, LanguageError::kWarning,
+          script, token_pos, LanguageError::kWarning,
           Heap::kNew, format, args));
   va_end(args);
   if (FLAG_warning_as_error) {
     I->long_jump_base()->Jump(1, error);
     UNREACHABLE();
   } else {
     OS::Print("%s", error.ToErrorCString());
+    va_start(args, format);
+    TraceBuffer::TraceWarningV(I, script, token_pos, format, args);
+    va_end(args);
   }
 }
 
 
 void FlowGraphBuilder::Bailout(const char* reason) const {
   const Function& function = parsed_function_->function();
   const Error& error = Error::Handle(
       I,
       LanguageError::NewFormatted(
           Error::Handle(I, Error::null()),  // No previous error.
           Script::Handle(I, function.script()),
           function.token_pos(),
           LanguageError::kBailout,
           Heap::kNew,
           "FlowGraphBuilder Bailout: %s %s",
           String::Handle(I, function.name()).ToCString(),
           reason));
   I->long_jump_base()->Jump(1, error);
   UNREACHABLE();
 }
 
 }  // namespace dart