Customized support for feedback on calls to Array.

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "bootstrapper.h"
 #include "code-stubs.h"
@@ skipping 2210 matching lines @@
     __ Push(rdi);
     __ Push(rax);
     __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
     __ Pop(rdi);
   }
   __ movp(args->GetReceiverOperand(), rax);
   __ jmp(cont);
 }
 
 
-void CallFunctionStub::Generate(MacroAssembler* masm) {
+static void CallFunctionNoFeedback(MacroAssembler* masm,
+                                   int argc, bool needs_checks,
+                                   bool call_as_method) {
   // rdi : the function to call
 
   // wrap_and_call can only be true if we are compiling a monomorphic method.
   Isolate* isolate = masm->isolate();
   Label slow, non_function, wrap, cont;
-  int argc = argc_;
   StackArgumentsAccessor args(rsp, argc);
 
-  if (NeedsChecks()) {
+  if (needs_checks) {
     // 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);
   }
 
   // Fast-case: Just invoke the function.
   ParameterCount actual(argc);
 
-  if (CallAsMethod()) {
-    if (NeedsChecks()) {
+  if (call_as_method) {
+    if (needs_checks) {
       EmitContinueIfStrictOrNative(masm, &cont);
     }
 
     // Load the receiver from the stack.
     __ movp(rax, args.GetReceiverOperand());
 
-    if (NeedsChecks()) {
+    if (needs_checks) {
       __ 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 (NeedsChecks()) {
+  if (needs_checks) {
     // Slow-case: Non-function called.
     __ bind(&slow);
     EmitSlowCase(isolate, masm, &args, argc, &non_function);
   }
 
-  if (CallAsMethod()) {
+  if (call_as_method) {
     __ bind(&wrap);
     EmitWrapCase(masm, &args, &cont);
   }
 }
 
 
+void CallFunctionStub::Generate(MacroAssembler* masm) {
+  CallFunctionNoFeedback(masm, argc_, NeedsChecks(), CallAsMethod());
+}
+
+
 void CallConstructStub::Generate(MacroAssembler* masm) {
   // rax : number of arguments
   // rbx : feedback vector
   // rdx : (only if rbx is not the megamorphic symbol) slot in feedback
   //       vector (Smi)
   // rdi : constructor function
   Label slow, non_function_call;
 
   // Check that function is not a smi.
   __ JumpIfSmi(rdi, &non_function_call);
@@ skipping 54 matching lines @@
 
 
 static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
   __ movp(vector, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   __ movp(vector, FieldOperand(vector, JSFunction::kSharedFunctionInfoOffset));
   __ movp(vector, FieldOperand(vector,
                                SharedFunctionInfo::kFeedbackVectorOffset));
 }
 
 
+void CallICStub::Generate_MonomorphicArray(MacroAssembler* masm, Label* miss) {
+  // rdi - function
+  // rbx - feedback vector
+  // rdx - slot id (as integer)
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rcx);
+  __ cmpq(rdi, rcx);
+  __ j(not_equal, miss);
+
+  __ movq(rax, Immediate(arg_count()));
+  __ movp(rbx, FieldOperand(rbx, rdx, times_pointer_size,
+                            FixedArray::kHeaderSize));
+
+  // Verify that ecx contains an AllocationSite
+  __ AssertUndefinedOrAllocationSite(rbx);
+  ArrayConstructorStub stub(masm->isolate(), arg_count());
+  __ TailCallStub(&stub);
+}
+
+
+void CallICStub::Generate_CustomFeedbackCall(MacroAssembler* masm) {
+  // rdi - function
+  // rbx - feedback vector
+  // rdx - slot id
+  Label miss;
+
+  __ SmiToInteger32(rdx, rdx);
+
+  if (state_.stub_type() == CallIC::MONOMORPHIC_ARRAY) {
+    Generate_MonomorphicArray(masm, &miss);
+  } else {
+    // So far there is only one customer for our custom feedback scheme.
+    UNREACHABLE();
+  }
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+
+  // The slow case, we need this no matter what to complete a call after a miss.
+  CallFunctionNoFeedback(masm,
+                         arg_count(),
+                         true,
+                         CallAsMethod());
+
+  // Unreachable.
+  __ int3();
+}
+
+
 void CallICStub::Generate(MacroAssembler* masm) {
   // rdi - function
   // rbx - vector
   // rdx - slot id
   Isolate* isolate = masm->isolate();
   Label extra_checks_or_miss, slow_start;
   Label slow, non_function, wrap, cont;
   Label have_js_function;
   int argc = state_.arg_count();
   StackArgumentsAccessor args(rsp, argc);
   ParameterCount actual(argc);
 
   EmitLoadTypeFeedbackVector(masm, rbx);
 
+  if (state_.stub_type() != CallIC::DEFAULT) {
+    Generate_CustomFeedbackCall(masm);
+    return;
+  }
+
   // The checks. First, does rdi 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);
 
   __ bind(&have_js_function);
   if (state_.CallAsMethod()) {
     EmitContinueIfStrictOrNative(masm, &cont);
 
@@ skipping 2651 matching lines @@
                               return_value_operand,
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64