Capturing for loop variables correctly

runtime/vm/code_generator_ia32.cc

 // Copyright (c) 2011, 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/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/code_generator.h"
 
 #include "lib/error.h"
@@ skipping 885 matching lines @@
 }
 
 
 void CodeGenerator::VisitPrimaryNode(PrimaryNode* node) {
   // PrimaryNodes are temporary during parsing.
   ErrorMsg(node->token_index(),
       "Unexpected primary node: %s", node->primary().ToCString());
 }
 
 
+void CodeGenerator::VisitCloneContextNode(CloneContextNode *node) {
+  const Context& result = Context::ZoneHandle();
+  __ PushObject(result);
+  __ pushl(CTX);
+  GenerateCallRuntime(node->id(),
+      node->token_index(), kCloneContextRuntimeEntry);
+  __ popl(EAX);
+  __ popl(CTX);  // result: cloned context. Set as current context.
+}
+
+
 void CodeGenerator::VisitSequenceNode(SequenceNode* node_sequence) {
   CodeGeneratorState codegen_state(this);
   LocalScope* scope = node_sequence->scope();
   ASSERT(scope != NULL);
   intptr_t num_context_variables = scope->num_context_variables();
   if (num_context_variables > 0) {
     // The loop local scope declares variables that are captured.
     // Allocate and chain a new context.
     __ movl(EDX, Immediate(num_context_variables));
     const ExternalLabel label("alloc_context",
@@ skipping 1752 matching lines @@
   const Class& cls = Class::Handle(parsed_function_.function().owner());
   const Script& script = Script::Handle(cls.script());
   Parser::ReportMsg(script, token_index, "Error", error_msg, format, args);
   Isolate::Current()->long_jump_base()->Jump(1, error_msg);
   UNREACHABLE();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32