Revert "Reland of https://codereview.chromium.org/172523002/"

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 58147e2a993c7f7fc4134ef1c33da2ed4e904921..11699e9f9c819471db0e745b91037c311fb9d5b7 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -2197,33 +2197,37 @@ static void GenerateRecordCallTarget(MacroAssembler* masm) {
 }
 
 
-static void GenericCallHelper(MacroAssembler* masm,
-                              const CallIC::State& state,
-                              bool wrap_and_call = false) {
+void CallFunctionStub::Generate(MacroAssembler* masm) {
+  // rbx : feedback vector
+  // rdx : (only if rbx is not the megamorphic symbol) slot in feedback
+  //       vector (Smi)
   // rdi : the function to call
-
-  // wrap_and_call can only be true if we are compiling a monomorphic method.
-  ASSERT(!(wrap_and_call && state.IsGeneric()));
-  ASSERT(!wrap_and_call || state.CallAsMethod());
   Isolate* isolate = masm->isolate();
   Label slow, non_function, wrap, cont;
-  int argc = state.arg_count();
-  StackArgumentsAccessor args(rsp, argc);
+  StackArgumentsAccessor args(rsp, argc_);
 
-  if (state.IsGeneric()) {
+  if (NeedsChecks()) {
     // Check that the function really is a JavaScript function.
     __ JumpIfSmi(rdi, &non_function);
 
     // Goto slow case if we do not have a function.
     __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
     __ j(not_equal, &slow);
+
+    if (RecordCallTarget()) {
+      GenerateRecordCallTarget(masm);
+      // Type information was updated. Because we may call Array, which
+      // expects either undefined or an AllocationSite in rbx we need
+      // to set rbx to undefined.
+      __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
+    }
   }
 
   // Fast-case: Just invoke the function.
-  ParameterCount actual(argc);
+  ParameterCount actual(argc_);
 
-  if (state.CallAsMethod()) {
-    if (state.IsGeneric()) {
+  if (CallAsMethod()) {
+    if (NeedsChecks()) {
       // Do not transform the receiver for strict mode functions.
       __ movp(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
       __ testb(FieldOperand(rcx, SharedFunctionInfo::kStrictModeByteOffset),
@@ -2237,39 +2241,43 @@ static void GenericCallHelper(MacroAssembler* masm,
       __ j(not_equal, &cont);
     }
 
-    if (state.IsGeneric() || state.IsSloppy() || wrap_and_call) {
-      // Load the receiver from the stack.
-      __ movp(rax, args.GetReceiverOperand());
 
-      if (state.IsGeneric()) {
-        __ JumpIfSmi(rax, &wrap);
+    // Load the receiver from the stack.
+    __ movp(rax, args.GetReceiverOperand());
 
-        __ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rcx);
-        __ j(below, &wrap);
-      } else {
-        __ jmp(&wrap);
-      }
+    if (NeedsChecks()) {
+      __ JumpIfSmi(rax, &wrap);
+
+      __ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rcx);
+      __ j(below, &wrap);
+    } else {
+      __ jmp(&wrap);
     }
 
     __ bind(&cont);
   }
+  __ InvokeFunction(rdi, actual, JUMP_FUNCTION, NullCallWrapper());
 
-  if (state.ArgumentsMustMatch()) {
-    __ InvokeFunction(rdi, actual, actual, JUMP_FUNCTION, NullCallWrapper());
-  } else {
-    __ InvokeFunction(rdi, actual, JUMP_FUNCTION, NullCallWrapper());
-  }
-
-  if (state.IsGeneric()) {
+  if (NeedsChecks()) {
     // Slow-case: Non-function called.
     __ bind(&slow);
+    if (RecordCallTarget()) {
+      // If there is a call target cache, mark it megamorphic in the
+      // non-function case.  MegamorphicSentinel is an immortal immovable
+      // object (megamorphic symbol) so no write barrier is needed.
+      __ SmiToInteger32(rdx, rdx);
+      __ Move(FieldOperand(rbx, rdx, times_pointer_size,
+                           FixedArray::kHeaderSize),
+              TypeFeedbackInfo::MegamorphicSentinel(isolate));
+      __ Integer32ToSmi(rdx, rdx);
+    }
     // Check for function proxy.
     __ CmpInstanceType(rcx, JS_FUNCTION_PROXY_TYPE);
     __ j(not_equal, &non_function);
     __ PopReturnAddressTo(rcx);
     __ Push(rdi);  // put proxy as additional argument under return address
     __ PushReturnAddressFrom(rcx);
-    __ Set(rax, argc + 1);
+    __ Set(rax, argc_ + 1);
     __ Set(rbx, 0);
     __ GetBuiltinEntry(rdx, Builtins::CALL_FUNCTION_PROXY);
     {
@@ -2282,7 +2290,7 @@ static void GenericCallHelper(MacroAssembler* masm,
     // of the original receiver from the call site).
     __ bind(&non_function);
     __ movp(args.GetReceiverOperand(), rdi);
-    __ Set(rax, argc);
+    __ Set(rax, argc_);
     __ Set(rbx, 0);
     __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION);
     Handle<Code> adaptor =
@@ -2290,17 +2298,8 @@ static void GenericCallHelper(MacroAssembler* masm,
     __ Jump(adaptor, RelocInfo::CODE_TARGET);
   }
 
-  if (state.CallAsMethod()) {
+  if (CallAsMethod()) {
     __ bind(&wrap);
-
-    if (!state.IsGeneric() && !wrap_and_call) {
-      // Do not transform the receiver for natives.
-      __ movp(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-      __ testb(FieldOperand(rcx, SharedFunctionInfo::kNativeByteOffset),
-               Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
-      __ j(not_equal, &cont);
-    }
-
     // Wrap the receiver and patch it back onto the stack.
     { FrameScope frame_scope(masm, StackFrame::INTERNAL);
       __ Push(rdi);
@@ -2314,30 +2313,6 @@ static void GenericCallHelper(MacroAssembler* masm,
 }
 
 
-void CallFunctionStub::Generate(MacroAssembler* masm) {
-  // rdi : the function to call
-
-  // GenericCallHelper expresses it's options in terms of CallIC::State.
-  CallIC::CallType call_type = CallAsMethod() ?
-      CallIC::METHOD : CallIC::FUNCTION;
-
-  if (NeedsChecks()) {
-    GenericCallHelper(masm,
-                      CallIC::State::SlowCallState(
-                          argc_,
-                          call_type));
-  } else {
-    GenericCallHelper(masm,
-                      CallIC::State::MonomorphicCallState(
-                          argc_,
-                          call_type,
-                          CallIC::ARGUMENTS_COUNT_UNKNOWN,
-                          SLOPPY),
-                      true);
-  }
-}
-
-
 void CallConstructStub::Generate(MacroAssembler* masm) {
   // rax : number of arguments
   // rbx : feedback vector
@@ -2404,92 +2379,6 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
 }
 
 
-void CallICStub::GenerateMonomorphicCall(MacroAssembler* masm) {
-  GenericCallHelper(masm,
-                    CallIC::State::MonomorphicCallState(
-                        state_.arg_count(),
-                        state_.call_type(),
-                        state_.argument_check(),
-                        state_.strict_mode()));
-}
-
-
-void CallICStub::GenerateSlowCall(MacroAssembler* masm) {
-  GenericCallHelper(masm,
-                    CallIC::State::SlowCallState(
-                        state_.arg_count(),
-                        state_.call_type()));
-}
-
-
-void CallICStub::Generate(MacroAssembler* masm) {
-  // rdi - function
-  // rbx - vector
-  // rdx - slot id
-  Isolate* isolate = masm->isolate();
-  Label extra_checks_or_miss, slow;
-
-  // The checks. First, does edi match the recorded monomorphic target?
-  __ SmiToInteger32(rdx, rdx);
-  __ cmpq(rdi, FieldOperand(rbx, rdx, times_pointer_size,
-                            FixedArray::kHeaderSize));
-  __ j(not_equal, &extra_checks_or_miss);
-
-  GenerateMonomorphicCall(masm);
-
-  __ bind(&extra_checks_or_miss);
-  if (IsGeneric()) {
-    Label miss_uninit;
-
-    __ movp(rcx, FieldOperand(rbx, rdx, times_pointer_size,
-                              FixedArray::kHeaderSize));
-    __ Cmp(rcx, TypeFeedbackInfo::MegamorphicSentinel(isolate));
-    __ j(equal, &slow);
-    __ Cmp(rcx, TypeFeedbackInfo::UninitializedSentinel(isolate));
-    __ j(equal, &miss_uninit);
-    // If we get here, go from monomorphic to megamorphic, Don't bother missing,
-    // just update.
-    __ Move(FieldOperand(rbx, rdx, times_pointer_size,
-                         FixedArray::kHeaderSize),
-           TypeFeedbackInfo::MegamorphicSentinel(isolate));
-    __ jmp(&slow);
-
-    __ bind(&miss_uninit);
-  }
-
-  GenerateMiss(masm);
-
-  // the slow case
-  __ bind(&slow);
-  GenerateSlowCall(masm);
-}
-
-
-void CallICStub::GenerateMiss(MacroAssembler* masm) {
-  // Get the receiver of the function from the stack; 1 ~ return address.
-  __ movp(rcx, Operand(rsp, (state_.arg_count() + 1) * kPointerSize));
-
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-
-    // Push the receiver and the function and feedback info.
-    __ Push(rcx);
-    __ Push(rdi);
-    __ Push(rbx);
-    __ Integer32ToSmi(rdx, rdx);
-    __ Push(rdx);
-
-    // Call the entry.
-    ExternalReference miss = ExternalReference(IC_Utility(IC::kCallIC_Miss),
-                                               masm->isolate());
-    __ CallExternalReference(miss, 4);
-
-    // Move result to edi and exit the internal frame.
-    __ movp(rdi, rax);
-  }
-}
-
-
 bool CEntryStub::NeedsImmovableCode() {
   return false;
 }