MIPS: Customized support for feedback on calls to Array.

Port r21429 (a88ba79)

Original commit message:
Gather transition feedback on array calls, and inline the Array
function call when it makes sense.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/293063012

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21445 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -3094,11 +3094,13 @@ static void EmitWrapCase(MacroAssembler* masm, int argc, Label* cont) {
 }
 
 
-void CallFunctionStub::Generate(MacroAssembler* masm) {
+static void CallFunctionNoFeedback(MacroAssembler* masm,
+                                   int argc, bool needs_checks,
+                                   bool call_as_method) {
   // a1 : the function to call
   Label slow, non_function, wrap, cont;
 
-  if (NeedsChecks()) {
+  if (needs_checks) {
     // Check that the function is really a JavaScript function.
     // a1: pushed function (to be verified)
     __ JumpIfSmi(a1, &non_function);
@@ -3110,18 +3112,17 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
 
   // Fast-case: Invoke the function now.
   // a1: pushed function
-  int argc = argc_;
   ParameterCount actual(argc);
 
-  if (CallAsMethod()) {
-    if (NeedsChecks()) {
+  if (call_as_method) {
+    if (needs_checks) {
       EmitContinueIfStrictOrNative(masm, &cont);
     }
 
     // Compute the receiver in sloppy mode.
     __ lw(a3, MemOperand(sp, argc * kPointerSize));
 
-    if (NeedsChecks()) {
+    if (needs_checks) {
       __ JumpIfSmi(a3, &wrap);
       __ GetObjectType(a3, t0, t0);
       __ Branch(&wrap, lt, t0, Operand(FIRST_SPEC_OBJECT_TYPE));
@@ -3134,13 +3135,13 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
 
   __ InvokeFunction(a1, actual, JUMP_FUNCTION, NullCallWrapper());
 
-  if (NeedsChecks()) {
+  if (needs_checks) {
     // Slow-case: Non-function called.
     __ bind(&slow);
     EmitSlowCase(masm, argc, &non_function);
   }
 
-  if (CallAsMethod()) {
+  if (call_as_method) {
     __ bind(&wrap);
     // Wrap the receiver and patch it back onto the stack.
     EmitWrapCase(masm, argc, &cont);
@@ -3148,6 +3149,11 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
 }
 
 
+void CallFunctionStub::Generate(MacroAssembler* masm) {
+  CallFunctionNoFeedback(masm, argc_, NeedsChecks(), CallAsMethod());
+}
+
+
 void CallConstructStub::Generate(MacroAssembler* masm) {
   // a0 : number of arguments
   // a1 : the function to call
@@ -3207,8 +3213,8 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
   __ bind(&do_call);
   // Set expected number of arguments to zero (not changing r0).
   __ li(a2, Operand(0, RelocInfo::NONE32));
-  __ Jump(isolate()->builtins()->ArgumentsAdaptorTrampoline(),
-          RelocInfo::CODE_TARGET);
+  __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+           RelocInfo::CODE_TARGET);
 }
 
 
@@ -3221,6 +3227,51 @@ static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
 }
 
 
+void CallICStub::Generate_MonomorphicArray(MacroAssembler* masm, Label* miss) {
+  // a1 - function
+  // a2 - feedback vector
+  // a3 - slot id
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, at);
+  __ Branch(miss, ne, a1, Operand(at));
+
+  __ li(a0, Operand(arg_count()));
+  __ sll(at, a3, kPointerSizeLog2 - kSmiTagSize);
+  __ Addu(at, a2, Operand(at));
+  __ lw(a2, FieldMemOperand(at, FixedArray::kHeaderSize));
+  // Verify that a2 contains an AllocationSite
+  __ AssertUndefinedOrAllocationSite(a2, at);
+  ArrayConstructorStub stub(masm->isolate(), arg_count());
+  __ TailCallStub(&stub);
+}
+
+
+void CallICStub::Generate_CustomFeedbackCall(MacroAssembler* masm) {
+  // a1 - function
+  // a2 - feedback vector
+  // a3 - slot id
+  Label miss;
+
+  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.
+  __ stop("Unexpected code address");
+}
+
+
 void CallICStub::Generate(MacroAssembler* masm) {
   // r1 - function
   // r3 - slot id (Smi)
@@ -3232,6 +3283,11 @@ void CallICStub::Generate(MacroAssembler* masm) {
 
   EmitLoadTypeFeedbackVector(masm, a2);
 
+  if (state_.stub_type() != CallIC::DEFAULT) {
+    Generate_CustomFeedbackCall(masm);
+    return;
+  }
+
   // The checks. First, does r1 match the recorded monomorphic target?
   __ sll(t0, a3, kPointerSizeLog2 - kSmiTagSize);
   __ Addu(t0, a2, Operand(t0));