[stubs] Refactor the CallICStub to pass the number of arguments.

src/mips/code-stubs-mips.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1899 matching lines @@
 // Note: feedback_vector and slot are clobbered after the call.
 static void IncrementCallCount(MacroAssembler* masm, Register feedback_vector,
                                Register slot) {
   __ Lsa(at, feedback_vector, slot, kPointerSizeLog2 - kSmiTagSize);
   __ lw(slot, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
   __ Addu(slot, slot, Operand(Smi::FromInt(1)));
   __ sw(slot, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
 }
 
 void CallICStub::HandleArrayCase(MacroAssembler* masm, Label* miss) {
+  // a0 - number of arguments
   // a1 - function
   // a3 - slot id
   // a2 - vector
   // t0 - loaded from vector[slot]
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, at);
   __ Branch(miss, ne, a1, Operand(at));
 
   // Increment the call count for monomorphic function calls.
   IncrementCallCount(masm, a2, a3);
 
   __ mov(a2, t0);
   __ mov(a3, a1);
-  __ li(a0, Operand(arg_count()));
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
 
 
 void CallICStub::Generate(MacroAssembler* masm) {
+  // a0 - number of arguments
   // a1 - function
   // a3 - slot id (Smi)
   // a2 - vector
   Label extra_checks_or_miss, call, call_function, call_count_incremented;
-  int argc = arg_count();
-  ParameterCount actual(argc);
 
   // The checks. First, does r1 match the recorded monomorphic target?
   __ Lsa(t0, a2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ lw(t0, FieldMemOperand(t0, FixedArray::kHeaderSize));
 
   // We don't know that we have a weak cell. We might have a private symbol
   // or an AllocationSite, but the memory is safe to examine.
   // AllocationSite::kTransitionInfoOffset - contains a Smi or pointer to
   // FixedArray.
   // WeakCell::kValueOffset - contains a JSFunction or Smi(0)
@@ skipping 13 matching lines @@
   // convincing us that we have a monomorphic JSFunction.
   __ JumpIfSmi(a1, &extra_checks_or_miss);
 
   __ bind(&call_function);
 
   // Increment the call count for monomorphic function calls.
   IncrementCallCount(masm, a2, a3);
 
   __ Jump(masm->isolate()->builtins()->CallFunction(convert_mode(),
                                                     tail_call_mode()),
-          RelocInfo::CODE_TARGET, al, zero_reg, Operand(zero_reg),
-          USE_DELAY_SLOT);
-  __ li(a0, Operand(argc));  // In delay slot.
+          RelocInfo::CODE_TARGET, al, zero_reg, Operand(zero_reg));
 
   __ bind(&extra_checks_or_miss);
   Label uninitialized, miss, not_allocation_site;
 
   __ LoadRoot(at, Heap::kmegamorphic_symbolRootIndex);
   __ Branch(&call, eq, t0, Operand(at));
 
   // Verify that t0 contains an AllocationSite
   __ lw(t1, FieldMemOperand(t0, HeapObject::kMapOffset));
   __ LoadRoot(at, Heap::kAllocationSiteMapRootIndex);
@@ skipping 20 matching lines @@
   __ Lsa(t0, a2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ LoadRoot(at, Heap::kmegamorphic_symbolRootIndex);
   __ sw(at, FieldMemOperand(t0, FixedArray::kHeaderSize));
 
   __ bind(&call);
   IncrementCallCount(masm, a2, a3);
 
   __ bind(&call_count_incremented);
 
   __ Jump(masm->isolate()->builtins()->Call(convert_mode(), tail_call_mode()),
-          RelocInfo::CODE_TARGET, al, zero_reg, Operand(zero_reg),
-          USE_DELAY_SLOT);
-  __ li(a0, Operand(argc));  // In delay slot.
+          RelocInfo::CODE_TARGET, al, zero_reg, Operand(zero_reg));
 
   __ bind(&uninitialized);
 
   // We are going monomorphic, provided we actually have a JSFunction.
   __ JumpIfSmi(a1, &miss);
 
   // Goto miss case if we do not have a function.
   __ GetObjectType(a1, t0, t0);
   __ Branch(&miss, ne, t0, Operand(JS_FUNCTION_TYPE));
 
   // Make sure the function is not the Array() function, which requires special
   // behavior on MISS.
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, t0);
   __ Branch(&miss, eq, a1, Operand(t0));
 
   // Make sure the function belongs to the same native context.
   __ lw(t0, FieldMemOperand(a1, JSFunction::kContextOffset));
   __ lw(t0, ContextMemOperand(t0, Context::NATIVE_CONTEXT_INDEX));
   __ lw(t1, NativeContextMemOperand());
   __ Branch(&miss, ne, t0, Operand(t1));
 
   // Store the function. Use a stub since we need a frame for allocation.
   // a2 - vector
   // a3 - slot
   // a1 - function
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
     CreateWeakCellStub create_stub(masm->isolate());
+    __ SmiTag(a0);
+    __ Push(a0);
     __ Push(a2, a3);
     __ Push(cp, a1);
     __ CallStub(&create_stub);
     __ Pop(cp, a1);
     __ Pop(a2, a3);
+    __ Pop(a0);
+    __ SmiUntag(a0);
   }
 
   __ Branch(&call_function);
 
   // We are here because tracing is on or we encountered a MISS case we can't
   // handle here.
   __ bind(&miss);
   GenerateMiss(masm);
 
   __ Branch(&call_count_incremented);
 }
 
 
 void CallICStub::GenerateMiss(MacroAssembler* masm) {
   FrameScope scope(masm, StackFrame::INTERNAL);
 
+  // Preserve the number of arguments as Smi.
+  __ SmiTag(a0);
+  __ Push(a0);
+
   // Push the receiver and the function and feedback info.
   __ Push(a1, a2, a3);
 
   // Call the entry.
   __ CallRuntime(Runtime::kCallIC_Miss);
 
   // Move result to a1 and exit the internal frame.
   __ mov(a1, v0);
+
+  // Restore number of arguments.
+  __ Pop(a0);
+  __ SmiUntag(a0);
 }
 
 
 // StringCharCodeAtGenerator.
 void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
   DCHECK(!t0.is(index_));
   DCHECK(!t0.is(result_));
   DCHECK(!t0.is(object_));
   if (check_mode_ == RECEIVER_IS_UNKNOWN) {
     // If the receiver is a smi trigger the non-string case.
@@ skipping 2984 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS