MIPS: Preliminary support for block contexts in hydrogen.

Port r21684 (ea35030)

Original commit message:
Patch from Steven Keuchel <keuchel@chromium.org>

BUG=v8:2198
LOG=N
TEST=mjsunit/harmony/block-let-crankshaft.js
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/313183007

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21701 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.cc

@@ -5874,6 +5874,21 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
 }
 
 
+void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
+  Register context = ToRegister(instr->context());
+  __ sw(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
+}
+
+
+void LCodeGen::DoAllocateBlockContext(LAllocateBlockContext* instr) {
+  Handle<ScopeInfo> scope_info = instr->scope_info();
+  __ li(at, scope_info);
+  __ Push(at, ToRegister(instr->function()));
+  CallRuntime(Runtime::kHiddenPushBlockContext, 2, instr);
+  RecordSafepoint(Safepoint::kNoLazyDeopt);
+}
+
+
 #undef __
 
 } }  // namespace v8::internal

src/mips/lithium-mips.cc

@@ -2526,4 +2526,20 @@ LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
 }
 
 
+
+LInstruction* LChunkBuilder::DoStoreFrameContext(HStoreFrameContext* instr) {
+  LOperand* context = UseRegisterAtStart(instr->context());
+  return new(zone()) LStoreFrameContext(context);
+}
+
+
+LInstruction* LChunkBuilder::DoAllocateBlockContext(
+    HAllocateBlockContext* instr) {
+  LOperand* context = UseFixed(instr->context(), cp);
+  LOperand* function = UseRegisterAtStart(instr->function());
+  LAllocateBlockContext* result =
+      new(zone()) LAllocateBlockContext(context, function);
+  return MarkAsCall(DefineFixed(result, cp), instr);
+}
+
 } }  // namespace v8::internal

src/mips/lithium-mips.h

@@ -21,6 +21,7 @@ class LCodeGen;
   V(AccessArgumentsAt)                          \
   V(AddI)                                       \
   V(Allocate)                                   \
+  V(AllocateBlockContext)                       \
   V(ApplyArguments)                             \
   V(ArgumentsElements)                          \
   V(ArgumentsLength)                            \
@@ -138,6 +139,7 @@ class LCodeGen;
   V(StackCheck)                                 \
   V(StoreCodeEntry)                             \
   V(StoreContextSlot)                           \
+  V(StoreFrameContext)                          \
   V(StoreGlobalCell)                            \
   V(StoreKeyed)                                 \
   V(StoreKeyedGeneric)                          \
@@ -2626,6 +2628,35 @@ class LLoadFieldByIndex V8_FINAL : public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LStoreFrameContext: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LStoreFrameContext(LOperand* context) {
+    inputs_[0] = context;
+  }
+
+  LOperand* context() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(StoreFrameContext, "store-frame-context")
+};
+
+
+class LAllocateBlockContext: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LAllocateBlockContext(LOperand* context, LOperand* function) {
+    inputs_[0] = context;
+    inputs_[1] = function;
+  }
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* function() { return inputs_[1]; }
+
+  Handle<ScopeInfo> scope_info() { return hydrogen()->scope_info(); }
+
+  DECLARE_CONCRETE_INSTRUCTION(AllocateBlockContext, "allocate-block-context")
+  DECLARE_HYDROGEN_ACCESSOR(AllocateBlockContext)
+};
+
+
 class LChunkBuilder;
 class LPlatformChunk V8_FINAL : public LChunk {
  public: