Preliminary support for block contexts in hydrogen.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 525944a3db2e42a4f4cbd6a15f4a58917dc9e220..07b9c5078876f18a56c5743c37763fdba2503798 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -5660,6 +5660,21 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
 }
 
 
+void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
+  Register context = ToRegister(instr->context());
+  __ mov(Operand(ebp, StandardFrameConstants::kContextOffset), context);
+}
+
+
+void LCodeGen::DoAllocateBlockContext(LAllocateBlockContext* instr) {
+  Handle<ScopeInfo> scope_info = instr->scope_info();
+  __ Push(scope_info);
+  __ push(ToOperand(instr->function()));
+  CallRuntime(Runtime::kHiddenPushBlockContext, 2, instr);

[Michael Starzinger, 2014/06/03 23:12:20]

Since this is only a runtime call, do we really need a separate HInstruction for
it? Could we use HCallRuntime instead? Or are there any plans to optimize
HAllocateBlockContext in the near future?

[rossberg, 2014/06/04 12:54:53]

Perhaps not in the near future, but we will have to do it eventually, presumably
in the not so far future. That said, I don't have an opinion what to prefer
right now.

[ulan, 2014/06/04 14:02:05]

Right, we will do it sooner than later. Leaving it as it is.

+  RecordSafepoint(Safepoint::kNoLazyDeopt);
+}
+
+
 #undef __
 
 } }  // namespace v8::internal