Preliminary code for block scopes and block contexts.

src/full-codegen.cc

Index: src/full-codegen.cc
diff --git a/src/full-codegen.cc b/src/full-codegen.cc
index e5375fc3ae8b4750b6c47a45346f08abb9c5c2bc..5e3cc2995cfb37970b41d646a5623c3c86dffbcb 100644
--- a/src/full-codegen.cc
+++ b/src/full-codegen.cc
@@ -35,6 +35,7 @@
 #include "macro-assembler.h"
 #include "prettyprinter.h"
 #include "scopes.h"
+#include "scopeinfo.h"
 #include "stub-cache.h"
 
 namespace v8 {
@@ -847,8 +848,19 @@ void FullCodeGenerator::VisitBlock(Block* stmt) {
   Breakable nested_statement(this, stmt);
   SetStatementPosition(stmt);
 
+  Scope* saved_scope = scope();
+  if (stmt->block_scope() != NULL) {
+    Comment cmnt(masm_, "[ Extend block context");
+    scope_ = stmt->block_scope();
+    __ Push(scope_->GetSerializedScopeInfo());
+    PushFunctionArgumentForContextAllocation();
+    __ CallRuntime(Runtime::kPushBlockContext, 2);
+    StoreToFrameField(StandardFrameConstants::kContextOffset,
+                      context_register());
+  }
   PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
   VisitStatements(stmt->statements());
+  scope_ = saved_scope;
   __ bind(nested_statement.break_target());
   PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS);
 }