X64 Crankshaft: Add DoOuterContext to x64 lithium.

Review URL: http://codereview.chromium.org/6570008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6914 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -2205,6 +2205,15 @@ void LCodeGen::DoContext(LContext* instr) {
 }
 
 
+void LCodeGen::DoOuterContext(LOuterContext* instr) {
+  Register context = ToRegister(instr->context());
+  Register result = ToRegister(instr->result());
+  __ movq(result,
+	  Operand(context, Context::SlotOffset(Context::CLOSURE_INDEX)));
+  __ movq(result, FieldOperand(result, JSFunction::kContextOffset));
+}
+
+
 void LCodeGen::DoGlobalObject(LGlobalObject* instr) {
   Register result = ToRegister(instr->result());
   __ movq(result, GlobalObjectOperand());

src/x64/lithium-x64.cc

@@ -1190,8 +1190,8 @@ LInstruction* LChunkBuilder::DoContext(HContext* instr) {
 
 
 LInstruction* LChunkBuilder::DoOuterContext(HOuterContext* instr) {
-  Abort("Unimplemented: DoOuterContext");
-  return NULL;
+  LOperand* context = UseRegisterAtStart(instr->value());
+  return DefineAsRegister(new LOuterContext(context));
 }
 
 

src/x64/lithium-x64.h

@@ -129,6 +129,7 @@ class LCodeGen;
   V(NumberUntagD)                               \
   V(ObjectLiteral)                              \
   V(OsrEntry)                                   \
+  V(OuterContext)                               \
   V(Parameter)                                  \
   V(PixelArrayLength)                           \
   V(Power)                                      \
@@ -1280,6 +1281,18 @@ class LContext: public LTemplateInstruction<1, 0, 0> {
 };
 
 
+class LOuterContext: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LOuterContext(LOperand* context) {
+    inputs_[0] = context;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(OuterContext, "outer-context")
+
+  LOperand* context() { return InputAt(0); }
+};
+
+
 class LGlobalObject: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")