Parser: add usage counters for "use asm".

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2727 matching lines @@
       const i::AstRawString* var_name =
           info.ast_value_factory()->GetOneByteString("x");
       i::Variable* var = inner_scope->Lookup(var_name);
       bool expected = outers[i].assigned || inners[j].assigned;
       CHECK(var != NULL);
       CHECK(var->is_used() || !expected);
       CHECK(var->maybe_assigned() == expected);
     }
   }
 }
+
+namespace {
+
+int* global_use_counts = NULL;
+
+void MockUseCounterCallback(v8::Isolate* isolate,
+                            v8::Isolate::UseCounterFeature feature) {
+  ++global_use_counts[feature];
+}
+
+}
+
+
+TEST(UseAsmUseCount) {
+  i::Isolate* isolate = CcTest::i_isolate();
+  i::HandleScope scope(isolate);
+  LocalContext env;
+  int use_counts[v8::Isolate::kUseCounterFeatureCount] = {};
+  global_use_counts = use_counts;
+  CcTest::isolate()->SetUseCounterCallback(MockUseCounterCallback);
+  CompileRun("\"use asm\";\n"
+             "var foo = 1;\n"
+             "\"use asm\";\n"  // Only the first one counts.
+             "function bar() { \"use asm\"; var baz = 1; }");
+  CHECK_EQ(2, use_counts[v8::Isolate::kUseAsm]);
+}