Revert r8140.

It breaks test when running with nosnapshot.
TBR=ager@chromium.org
Review URL: http://codereview.chromium.org/7027029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8145 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-arm.cc

@@ -808,11 +808,6 @@ LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
-  return AssignEnvironment(new LDeoptimize);
-}
-
-
 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
   return AssignEnvironment(new LDeoptimize);
 }

src/hydrogen-instructions.cc

@@ -1083,16 +1083,6 @@ void HSimulate::PrintDataTo(StringStream* stream) {
 }
 
 
-void HDeoptimize::PrintDataTo(StringStream* stream) {
-  if (OperandCount() == 0) return;
-  OperandAt(0)->PrintNameTo(stream);
-  for (int i = 1; i < OperandCount(); ++i) {
-    stream->Add(" ");
-    OperandAt(i)->PrintNameTo(stream);
-  }
-}
-
-
 void HEnterInlined::PrintDataTo(StringStream* stream) {
   SmartPointer<char> name = function()->debug_name()->ToCString();
   stream->Add("%s, id=%d", *name, function()->id());

src/hydrogen-instructions.h

@@ -146,7 +146,6 @@ class LChunkBuilder;
   V(Shl)                                       \
   V(Shr)                                       \
   V(Simulate)                                  \
-  V(SoftDeoptimize)                            \
   V(StackCheck)                                \
   V(StoreContextSlot)                          \
   V(StoreGlobalCell)                           \
@@ -848,19 +847,6 @@ class HBlockEntry: public HTemplateInstruction<0> {
 };
 
 
-// We insert soft-deoptimize when we hit code with unknown typefeedback,
-// so that we get a chance of re-optimizing with useful typefeedback.
-// HSoftDeoptimize does not end a basic block as opposed to HDeoptimize.
-class HSoftDeoptimize: public HTemplateInstruction<0> {
- public:
-  virtual Representation RequiredInputRepresentation(int index) const {
-    return Representation::None();
-  }
-
-  DECLARE_CONCRETE_INSTRUCTION(SoftDeoptimize)
-};
-
-
 class HDeoptimize: public HControlInstruction {
  public:
   explicit HDeoptimize(int environment_length)
@@ -873,7 +859,6 @@ class HDeoptimize: public HControlInstruction {
 
   virtual int OperandCount() { return values_.length(); }
   virtual HValue* OperandAt(int index) { return values_[index]; }
-  virtual void PrintDataTo(StringStream* stream);
 
   void AddEnvironmentValue(HValue* value) {
     values_.Add(NULL);

src/hydrogen.cc

@@ -68,7 +68,8 @@ HBasicBlock::HBasicBlock(HGraph* graph)
       last_instruction_index_(-1),
       deleted_phis_(4),
       parent_loop_header_(NULL),
-      is_inline_return_target_(false) { }
+      is_inline_return_target_(false) {
+}
 
 
 void HBasicBlock::AttachLoopInformation() {
@@ -4309,22 +4310,21 @@ bool HGraphBuilder::TryInline(Call* expr) {
   if (inlined_test_context() != NULL) {
     HBasicBlock* if_true = inlined_test_context()->if_true();
     HBasicBlock* if_false = inlined_test_context()->if_false();
-
-    // Pop the return test context from the expression context stack.
+    if_true->SetJoinId(expr->id());
+    if_false->SetJoinId(expr->id());
     ASSERT(ast_context() == inlined_test_context());
+    // Pop the return test context from the expression context stack.
     ClearInlinedTestContext();
 
     // Forward to the real test context.
-    if (if_true->HasPredecessor()) {
-      if_true->SetJoinId(expr->id());
-      HBasicBlock* true_target = TestContext::cast(ast_context())->if_true();
-      if_true->Goto(true_target, false);
-    }
-    if (if_false->HasPredecessor()) {
-      if_false->SetJoinId(expr->id());
-      HBasicBlock* false_target = TestContext::cast(ast_context())->if_false();
-      if_false->Goto(false_target, false);
-    }
+    HBasicBlock* true_target = TestContext::cast(ast_context())->if_true();
+    HBasicBlock* false_target = TestContext::cast(ast_context())->if_false();
+    if_true->Goto(true_target, false);
+    if_false->Goto(false_target, false);
+
+    // TODO(kmillikin): Come up with a better way to handle this. It is too
+    // subtle. NULL here indicates that the enclosing context has no control
+    // flow to handle.
     set_current_block(NULL);
 
   } else if (function_return()->HasPredecessor()) {
@@ -4791,10 +4791,6 @@ void HGraphBuilder::VisitSub(UnaryOperation* expr) {
   HValue* value = Pop();
   HInstruction* instr = new(zone()) HMul(value, graph_->GetConstantMinus1());
   TypeInfo info = oracle()->UnaryType(expr);
-  if (info.IsUninitialized()) {
-    AddInstruction(new(zone()) HSoftDeoptimize);
-    info = TypeInfo::Unknown();
-  }
   Representation rep = ToRepresentation(info);
   TraceRepresentation(expr->op(), info, instr, rep);
   instr->AssumeRepresentation(rep);
@@ -4805,10 +4801,6 @@ void HGraphBuilder::VisitSub(UnaryOperation* expr) {
 void HGraphBuilder::VisitBitNot(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->expression()));
   HValue* value = Pop();
-  TypeInfo info = oracle()->UnaryType(expr);
-  if (info.IsUninitialized()) {
-    AddInstruction(new(zone()) HSoftDeoptimize);
-  }
   HInstruction* instr = new(zone()) HBitNot(value);
   ast_context()->ReturnInstruction(instr, expr->id());
 }
@@ -5040,57 +5032,7 @@ HInstruction* HGraphBuilder::BuildBinaryOperation(BinaryOperation* expr,
                                                   HValue* left,
                                                   HValue* right) {
   TypeInfo info = oracle()->BinaryType(expr);
-  if (info.IsUninitialized()) {
-    AddInstruction(new(zone()) HSoftDeoptimize);
-    info = TypeInfo::Unknown();
-  }
-  HInstruction* instr = NULL;
-  switch (expr->op()) {
-    case Token::ADD:
-      if (info.IsString()) {
-        AddInstruction(new(zone()) HCheckNonSmi(left));
-        AddInstruction(HCheckInstanceType::NewIsString(left));
-        AddInstruction(new(zone()) HCheckNonSmi(right));
-        AddInstruction(HCheckInstanceType::NewIsString(right));
-        instr = new(zone()) HStringAdd(left, right);
-      } else {
-        instr = new(zone()) HAdd(left, right);
-      }
-      break;
-    case Token::SUB:
-      instr = new(zone()) HSub(left, right);
-      break;
-    case Token::MUL:
-      instr = new(zone()) HMul(left, right);
-      break;
-    case Token::MOD:
-      instr = new(zone()) HMod(left, right);
-      break;
-    case Token::DIV:
-      instr = new(zone()) HDiv(left, right);
-      break;
-    case Token::BIT_XOR:
-      instr = new(zone()) HBitXor(left, right);
-      break;
-    case Token::BIT_AND:
-      instr = new(zone()) HBitAnd(left, right);
-      break;
-    case Token::BIT_OR:
-      instr = new(zone()) HBitOr(left, right);
-      break;
-    case Token::SAR:
-      instr = new(zone()) HSar(left, right);
-      break;
-    case Token::SHR:
-      instr = new(zone()) HShr(left, right);
-      break;
-    case Token::SHL:
-      instr = new(zone()) HShl(left, right);
-      break;
-    default:
-      UNREACHABLE();
-  }
-
+  HInstruction* instr = BuildBinaryOperation(expr->op(), left, right, info);
   // If we hit an uninitialized binary op stub we will get type info
   // for a smi operation. If one of the operands is a constant string
   // do not generate code assuming it is a smi operation.
@@ -5110,6 +5052,36 @@ HInstruction* HGraphBuilder::BuildBinaryOperation(BinaryOperation* expr,
 }
 
 
+HInstruction* HGraphBuilder::BuildBinaryOperation(
+    Token::Value op, HValue* left, HValue* right, TypeInfo info) {
+  switch (op) {
+    case Token::ADD:
+      if (info.IsString()) {
+        AddInstruction(new(zone()) HCheckNonSmi(left));
+        AddInstruction(HCheckInstanceType::NewIsString(left));
+        AddInstruction(new(zone()) HCheckNonSmi(right));
+        AddInstruction(HCheckInstanceType::NewIsString(right));
+        return new(zone()) HStringAdd(left, right);
+      } else {
+        return new(zone()) HAdd(left, right);
+      }
+    case Token::SUB: return new(zone()) HSub(left, right);
+    case Token::MUL: return new(zone()) HMul(left, right);
+    case Token::MOD: return new(zone()) HMod(left, right);
+    case Token::DIV: return new(zone()) HDiv(left, right);
+    case Token::BIT_XOR: return new(zone()) HBitXor(left, right);
+    case Token::BIT_AND: return new(zone()) HBitAnd(left, right);
+    case Token::BIT_OR: return new(zone()) HBitOr(left, right);
+    case Token::SAR: return new(zone()) HSar(left, right);
+    case Token::SHR: return new(zone()) HShr(left, right);
+    case Token::SHL: return new(zone()) HShl(left, right);
+    default:
+      UNREACHABLE();
+      return NULL;
+  }
+}
+
+
 // Check for the form (%_ClassOf(foo) === 'BarClass').
 static bool IsClassOfTest(CompareOperation* expr) {
   if (expr->op() != Token::EQ_STRICT) return false;
@@ -5307,13 +5279,6 @@ void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
     return;
   }
 
-  TypeInfo type_info = oracle()->CompareType(expr);
-  // Check if this expression was ever executed according to type feedback.
-  if (type_info.IsUninitialized()) {
-    AddInstruction(new(zone()) HSoftDeoptimize);
-    type_info = TypeInfo::Unknown();
-  }
-
   CHECK_ALIVE(VisitForValue(expr->left()));
   CHECK_ALIVE(VisitForValue(expr->right()));
 
@@ -5321,6 +5286,7 @@ void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
   HValue* left = Pop();
   Token::Value op = expr->op();
 
+  TypeInfo type_info = oracle()->CompareType(expr);
   HInstruction* instr = NULL;
   if (op == Token::INSTANCEOF) {
     // Check to see if the rhs of the instanceof is a global function not

src/hydrogen.h

@@ -878,6 +878,10 @@ class HGraphBuilder: public AstVisitor {
   HInstruction* BuildBinaryOperation(BinaryOperation* expr,
                                      HValue* left,
                                      HValue* right);
+  HInstruction* BuildBinaryOperation(Token::Value op,
+                                     HValue* left,
+                                     HValue* right,
+                                     TypeInfo info);
   HInstruction* BuildIncrement(bool returns_original_input,
                                CountOperation* expr);
   HLoadNamedField* BuildLoadNamedField(HValue* object,

src/ia32/lithium-ia32.cc

@@ -804,11 +804,6 @@ LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
-  return AssignEnvironment(new LDeoptimize);
-}
-
-
 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
   return AssignEnvironment(new LDeoptimize);
 }

src/type-info.cc

@@ -224,7 +224,8 @@ TypeInfo TypeFeedbackOracle::CompareType(CompareOperation* expr) {
   switch (state) {
     case CompareIC::UNINITIALIZED:
       // Uninitialized means never executed.
-      return TypeInfo::Uninitialized();
+      // TODO(fschneider): Introduce a separate value for never-executed ICs.
+      return unknown;
     case CompareIC::SMIS:
       return TypeInfo::Smi();
     case CompareIC::HEAP_NUMBERS:
@@ -285,7 +286,8 @@ TypeInfo TypeFeedbackOracle::BinaryType(BinaryOperation* expr) {
     switch (type) {
       case BinaryOpIC::UNINITIALIZED:
         // Uninitialized means never executed.
-        return TypeInfo::Uninitialized();
+        // TODO(fschneider): Introduce a separate value for never-executed ICs
+        return unknown;
       case BinaryOpIC::SMI:
         switch (result_type) {
           case BinaryOpIC::UNINITIALIZED:

src/x64/lithium-x64.cc

@@ -803,11 +803,6 @@ LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
-  return AssignEnvironment(new LDeoptimize);
-}
-
-
 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
   return AssignEnvironment(new LDeoptimize);
 }

test/mjsunit/regress/regress-1118.js

@@ -55,6 +55,8 @@ function h() {
     while (%GetOptimizationStatus(h) == 2) {
       for (var j = 0; j < 100; j++) g();
     }
+    assertTrue(%GetOptimizationStatus(h) == 1 ||
+               %GetOptimizationStatus(h) == 3);
     g();
   }
 }