Implement argument definition test in the vm.

runtime/vm/symbols.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/symbols.h"
 
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/raw_object.h"
@@ skipping 10 matching lines @@
 static const char* names[] = {
   NULL,
 
 #define DEFINE_SYMBOL_LITERAL(symbol, literal)                                 \
   literal,
 PREDEFINED_SYMBOLS_LIST(DEFINE_SYMBOL_LITERAL)
 #undef DEFINE_SYMBOL_LITERAL
 };
 
 
+const char* Symbols::Name(intptr_t symbol) {

[hausner, 2012/08/31 00:34:55]

Why is this needed (or better) than getting the raw pointers using
Symbols::Foo()?

Symbols::Name(Symbols::kFoo) versus Symbols::Foo()
 

[regis, 2012/08/31 01:36:18]

See the other comment. When we just need a char*, it is a waste to allocate a
handle.

+  ASSERT((symbol > kIllegal) && (symbol < kMaxId));
+  return names[symbol];
+}
+
+
 void Symbols::InitOnce(Isolate* isolate) {
   // Should only be run by the vm isolate.
   ASSERT(isolate == Dart::vm_isolate());
 
   // Create and setup a symbol table in the vm isolate.
   SetupSymbolTable(isolate);
 
   // Turn off population of symbols in the VM symbol table, so that we
   // don't find these symbols while doing a Symbols::New(...).
   // Create all predefined symbols.
@@ skipping 265 matching lines @@
 }
 
 
 RawObject* Symbols::GetVMSymbol(intptr_t object_id) {
   ASSERT(IsVMSymbolId(object_id));
   intptr_t i = (object_id - kMaxPredefinedObjectIds);
   return (i > 0 && i < Symbols::kMaxId) ? predefined_[i] : Object::null();
 }
 
 }  // namespace dart