Fast codegen: Implement with.

src/fast-codegen.cc

Index: src/fast-codegen.cc
diff --git a/src/fast-codegen.cc b/src/fast-codegen.cc
index c63522455306c95566300f1d7f661b4c9d1861e7..7f75ef14abc9cfd64bc8377707788338482269d5 100644
--- a/src/fast-codegen.cc
+++ b/src/fast-codegen.cc
@@ -337,12 +337,34 @@ void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
 
 
 void FastCodeGenerator::VisitWithEnterStatement(WithEnterStatement* stmt) {
-  UNREACHABLE();
+  Comment cmnt(masm_, "[ WithEnterStatement");
+  if (FLAG_debug_info) {

[Kevin Millikin (Chromium), 2009/12/14 16:35:47]

SetStatementPosition(stmt)?

[Lasse Reichstein, 2009/12/16 13:40:31]

Should have known it would be in the fast codegen as well.

+    CodeGenerator::RecordPositions(masm(), stmt->statement_pos());
+  }
+
+  Visit(stmt->expression());
+  if (stmt->is_catch_block()) {
+    __ CallRuntime(Runtime::kPushCatchContext, 1);
+  } else {
+    __ CallRuntime(Runtime::kPushContext, 1);
+  }
+  // Both runtime calls return the new context in both the context and the
+  // result registers.
+
+  // Update local stack frame context field.
+  StoreFrameField(StandardFrameConstants::kContextOffset, context_register());
 }
 
 
 void FastCodeGenerator::VisitWithExitStatement(WithExitStatement* stmt) {
-  UNREACHABLE();
+  Comment cmnt(masm_, "[ WithExitStatement");
+  if (FLAG_debug_info) {

[Kevin Millikin (Chromium), 2009/12/14 16:35:47]

Same.

[Lasse Reichstein, 2009/12/16 13:40:31]

Fixed.

+    CodeGenerator::RecordPositions(masm(), stmt->statement_pos());
+  }
+  // Pop context.
+  LoadContextField(context_register(), Context::PREVIOUS_INDEX);
+  // Update local stack frame context field.
+  StoreFrameField(StandardFrameConstants::kContextOffset, context_register());
 }