Revert r10118 from bleeding edge.

It causes several test failures which I need to investigate.
Review URL: http://codereview.chromium.org/8769008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10132 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-arm.cc

@@ -2202,7 +2202,12 @@ LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
 
 
 LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
-  return AssignEnvironment(AssignPointerMap(new LStackCheck));
+  if (instr->is_function_entry()) {
+    return MarkAsCall(new LStackCheck, instr);
+  } else {
+    ASSERT(instr->is_backwards_branch());
+    return AssignEnvironment(AssignPointerMap(new LStackCheck));
+  }
 }
 
 

src/arm/lithium-codegen-arm.cc

@@ -4649,22 +4649,38 @@ void LCodeGen::DoStackCheck(LStackCheck* instr) {
     LStackCheck* instr_;
   };
 
-  DeferredStackCheck* deferred_stack_check =
-      new DeferredStackCheck(this, instr);
-  __ LoadRoot(ip, Heap::kStackLimitRootIndex);
-  __ cmp(sp, Operand(ip));
-  __ b(lo, deferred_stack_check->entry());
-  EnsureSpaceForLazyDeopt();
-  __ bind(instr->done_label());
-  deferred_stack_check->SetExit(instr->done_label());
-  // There is no LLazyBailout instruction for stack-checks. We have to
-  // prepare for lazy deoptimization explicitly here.
   ASSERT(instr->HasEnvironment());
   LEnvironment* env = instr->environment();
-  RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
-  // Don't record a deoptimization index for the safepoint here.
-  // This will be done explicitly when emitting call and the safepoint in
-  // the deferred code.
+  // There is no LLazyBailout instruction for stack-checks. We have to
+  // prepare for lazy deoptimization explicitly here.
+  if (instr->hydrogen()->is_function_entry()) {
+    // Perform stack overflow check.
+    Label done;
+    __ LoadRoot(ip, Heap::kStackLimitRootIndex);
+    __ cmp(sp, Operand(ip));
+    __ b(hs, &done);
+    StackCheckStub stub;
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+    EnsureSpaceForLazyDeopt();
+    __ bind(&done);
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
+  } else {
+    ASSERT(instr->hydrogen()->is_backwards_branch());
+    // Perform stack overflow check if this goto needs it before jumping.
+    DeferredStackCheck* deferred_stack_check =
+        new DeferredStackCheck(this, instr);
+    __ LoadRoot(ip, Heap::kStackLimitRootIndex);
+    __ cmp(sp, Operand(ip));
+    __ b(lo, deferred_stack_check->entry());
+    EnsureSpaceForLazyDeopt();
+    __ bind(instr->done_label());
+    deferred_stack_check->SetExit(instr->done_label());
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    // Don't record a deoptimization index for the safepoint here.
+    // This will be done explicitly when emitting call and the safepoint in
+    // the deferred code.
+  }
 }
 
 

src/hydrogen-instructions.h

@@ -1271,7 +1271,12 @@ class HSimulate: public HInstruction {
 
 class HStackCheck: public HTemplateInstruction<1> {
  public:
-  explicit HStackCheck(HValue* context) {
+  enum Type {
+    kFunctionEntry,
+    kBackwardsBranch
+  };
+
+  HStackCheck(HValue* context, Type type) : type_(type) {
     SetOperandAt(0, context);
   }
 
@@ -1289,7 +1294,13 @@ class HStackCheck: public HTemplateInstruction<1> {
     }
   }
 
+  bool is_function_entry() { return type_ == kFunctionEntry; }
+  bool is_backwards_branch() { return type_ == kBackwardsBranch; }
+
   DECLARE_CONCRETE_INSTRUCTION(StackCheck)
+
+ private:
+  Type type_;
 };
 
 

src/hydrogen.cc

@@ -2333,7 +2333,8 @@ HGraph* HGraphBuilder::CreateGraph() {
     AddSimulate(AstNode::kDeclarationsId);
 
     HValue* context = environment()->LookupContext();
-    AddInstruction(new(zone()) HStackCheck(context));
+    AddInstruction(
+        new(zone()) HStackCheck(context, HStackCheck::kFunctionEntry));
 
     VisitStatements(info()->function()->body());
     if (HasStackOverflow()) return NULL;
@@ -2921,7 +2922,8 @@ void HGraphBuilder::VisitLoopBody(IterationStatement* stmt,
   BreakAndContinueScope push(break_info, this);
   AddSimulate(stmt->StackCheckId());
   HValue* context = environment()->LookupContext();
-  HStackCheck* stack_check = new(zone()) HStackCheck(context);
+  HStackCheck* stack_check =
+    new(zone()) HStackCheck(context, HStackCheck::kBackwardsBranch);
   AddInstruction(stack_check);
   ASSERT(loop_entry->IsLoopHeader());
   loop_entry->loop_information()->set_stack_check(stack_check);

src/ia32/lithium-codegen-ia32.cc

@@ -4554,23 +4554,43 @@ void LCodeGen::DoStackCheck(LStackCheck* instr) {
     LStackCheck* instr_;
   };
 
-  DeferredStackCheck* deferred_stack_check =
-      new DeferredStackCheck(this, instr);
-  ExternalReference stack_limit =
-      ExternalReference::address_of_stack_limit(isolate());
-  __ cmp(esp, Operand::StaticVariable(stack_limit));
-  __ j(below, deferred_stack_check->entry());
-  EnsureSpaceForLazyDeopt();
-  __ bind(instr->done_label());
-  deferred_stack_check->SetExit(instr->done_label());
-  // There is no LLazyBailout instruction for stack-checks. We have to
-  // prepare for lazy deoptimization explicitly here.
   ASSERT(instr->HasEnvironment());
   LEnvironment* env = instr->environment();
-  RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
-  // Don't record a deoptimization index for the safepoint here.
-  // This will be done explicitly when emitting call and the safepoint in
-  // the deferred code.
+  // There is no LLazyBailout instruction for stack-checks. We have to
+  // prepare for lazy deoptimization explicitly here.
+  if (instr->hydrogen()->is_function_entry()) {
+    // Perform stack overflow check.
+    Label done;
+    ExternalReference stack_limit =
+        ExternalReference::address_of_stack_limit(isolate());
+    __ cmp(esp, Operand::StaticVariable(stack_limit));
+    __ j(above_equal, &done, Label::kNear);
+
+    ASSERT(instr->context()->IsRegister());
+    ASSERT(ToRegister(instr->context()).is(esi));
+    StackCheckStub stub;
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+    EnsureSpaceForLazyDeopt();
+    __ bind(&done);
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
+  } else {
+    ASSERT(instr->hydrogen()->is_backwards_branch());
+    // Perform stack overflow check if this goto needs it before jumping.
+    DeferredStackCheck* deferred_stack_check =
+        new DeferredStackCheck(this, instr);
+    ExternalReference stack_limit =
+        ExternalReference::address_of_stack_limit(isolate());
+    __ cmp(esp, Operand::StaticVariable(stack_limit));
+    __ j(below, deferred_stack_check->entry());
+    EnsureSpaceForLazyDeopt();
+    __ bind(instr->done_label());
+    deferred_stack_check->SetExit(instr->done_label());
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    // Don't record a deoptimization index for the safepoint here.
+    // This will be done explicitly when emitting call and the safepoint in
+    // the deferred code.
+  }
 }
 
 

src/ia32/lithium-ia32.cc

@@ -2328,9 +2328,15 @@ LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
 
 
 LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
-  LOperand* context = UseAny(instr->context());
-  return AssignEnvironment(
-      AssignPointerMap(new(zone()) LStackCheck(context)));
+  if (instr->is_function_entry()) {
+    LOperand* context = UseFixed(instr->context(), esi);
+    return MarkAsCall(new(zone()) LStackCheck(context), instr);
+  } else {
+    ASSERT(instr->is_backwards_branch());
+    LOperand* context = UseAny(instr->context());
+    return AssignEnvironment(
+        AssignPointerMap(new(zone()) LStackCheck(context)));
+  }
 }
 
 

src/ia32/lithium-ia32.h

@@ -228,6 +228,7 @@ class LInstruction: public ZoneObject {
   LPointerMap* pointer_map() const { return pointer_map_.get(); }
   bool HasPointerMap() const { return pointer_map_.is_set(); }
 
+
   void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
   HValue* hydrogen_value() const { return hydrogen_value_; }
 

src/x64/lithium-codegen-x64.cc

@@ -4263,21 +4263,38 @@ void LCodeGen::DoStackCheck(LStackCheck* instr) {
     LStackCheck* instr_;
   };
 
-  DeferredStackCheck* deferred_stack_check =
-      new DeferredStackCheck(this, instr);
-  __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
-  __ j(below, deferred_stack_check->entry());
-  EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
-  __ bind(instr->done_label());
-  deferred_stack_check->SetExit(instr->done_label());
-  // There is no LLazyBailout instruction for stack-checks. We have to
-  // prepare for lazy deoptimization explicitly here.
   ASSERT(instr->HasEnvironment());
   LEnvironment* env = instr->environment();
-  RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
-  // Don't record a deoptimization index for the safepoint here.
-  // This will be done explicitly when emitting call and the safepoint in
-  // the deferred code.
+  // There is no LLazyBailout instruction for stack-checks. We have to
+  // prepare for lazy deoptimization explicitly here.
+  if (instr->hydrogen()->is_function_entry()) {
+    // Perform stack overflow check.
+    Label done;
+    __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
+    __ j(above_equal, &done, Label::kNear);
+    StackCheckStub stub;
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+    EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
+    last_lazy_deopt_pc_ = masm()->pc_offset();
+    __ bind(&done);
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
+  } else {
+    ASSERT(instr->hydrogen()->is_backwards_branch());
+    // Perform stack overflow check if this goto needs it before jumping.
+    DeferredStackCheck* deferred_stack_check =
+        new DeferredStackCheck(this, instr);
+    __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
+    __ j(below, deferred_stack_check->entry());
+    EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
+    last_lazy_deopt_pc_ = masm()->pc_offset();
+    __ bind(instr->done_label());
+    deferred_stack_check->SetExit(instr->done_label());
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    // Don't record a deoptimization index for the safepoint here.
+    // This will be done explicitly when emitting call and the safepoint in
+    // the deferred code.
+  }
 }
 
 

src/x64/lithium-x64.cc

@@ -2203,7 +2203,12 @@ LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
 
 
 LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
-  return AssignEnvironment(AssignPointerMap(new LStackCheck));
+  if (instr->is_function_entry()) {
+    return MarkAsCall(new LStackCheck, instr);
+  } else {
+    ASSERT(instr->is_backwards_branch());
+    return AssignEnvironment(AssignPointerMap(new LStackCheck));
+  }
 }