[Interpreter] Implements calls through CallICStub in the interpreter.

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/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2163 matching lines @@
   __ Addu(at, t0, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Jump(at);
 
   __ bind(&non_function);
   __ mov(a3, a1);
   __ Jump(isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 void CallICStub::HandleArrayCase(MacroAssembler* masm, Label* miss) {
+  // a0 - number of arguments - if argc_in_register() is true.
   // a1 - function
   // a3 - slot id
   // a2 - vector
   // t0 - loaded from vector[slot]
   __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, at);
   __ Branch(miss, ne, a1, Operand(at));
 
-  __ li(a0, Operand(arg_count()));
-
   // Increment the call count for monomorphic function calls.
   __ Lsa(at, a2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ lw(a3, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
   __ Addu(a3, a3, Operand(Smi::FromInt(CallICNexus::kCallCountIncrement)));
   __ sw(a3, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
 
   __ mov(a2, t0);
   __ mov(a3, a1);
-  ArrayConstructorStub stub(masm->isolate(), arg_count());
-  __ TailCallStub(&stub);
+  if (argc_in_register()) {
+    // Pass a default ArgumentCountKey::Any since the argc is only available
+    // in a0. We do not have the actual count here.
+    ArrayConstructorStub stub(masm->isolate());
+    __ TailCallStub(&stub);
+  } else {
+    // arg_count() is expected in a0 if the arg_count() >= 2
+    // (ArgumentCountKey::MORE_THAN_ONE).
+    ArrayConstructorStub stub(masm->isolate(), arg_count());
+    __ TailCallStub(&stub);
+  }
 }
 
 
 void CallICStub::Generate(MacroAssembler* masm) {
+  // a0 - number of arguments - if argc_in_register() is true.
   // a1 - function
   // a3 - slot id (Smi)
   // a2 - vector
   Label extra_checks_or_miss, call, call_function;
-  int argc = arg_count();
-  ParameterCount actual(argc);
+  if (!argc_in_register()) {
+    int argc = arg_count();
+    __ li(a0, argc);
+  }
 
-  // The checks. First, does r1 match the recorded monomorphic target?
+  // The checks. First, does a1 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)
   // Symbol::kHashFieldSlot - if the low bit is 1, then the hash is not
   // computed, meaning that it can't appear to be a pointer. If the low bit is
@@ skipping 13 matching lines @@
 
   // Increment the call count for monomorphic function calls.
   __ Lsa(at, a2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ lw(a3, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
   __ Addu(a3, a3, Operand(Smi::FromInt(CallICNexus::kCallCountIncrement)));
   __ sw(a3, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
 
   __ bind(&call_function);
   __ 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 16 matching lines @@
   // to handle it here. More complex cases are dealt with in the runtime.
   __ AssertNotSmi(t0);
   __ GetObjectType(t0, t1, t1);
   __ Branch(&miss, ne, t1, Operand(JS_FUNCTION_TYPE));
   __ Lsa(t0, a2, a3, kPointerSizeLog2 - kSmiTagSize);
   __ LoadRoot(at, Heap::kmegamorphic_symbolRootIndex);
   __ sw(at, FieldMemOperand(t0, FixedArray::kHeaderSize));
 
   __ bind(&call);
   __ 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));
 
@@ skipping 13 matching lines @@
   __ li(t0, Operand(Smi::FromInt(CallICNexus::kCallCountIncrement)));
   __ sw(t0, FieldMemOperand(at, FixedArray::kHeaderSize + kPointerSize));
 
   // 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());
-    __ Push(a1);
+    __ SmiTag(a0);
+    __ Push(a0, a1);
     __ CallStub(&create_stub);
-    __ Pop(a1);
+    __ Pop(a0, a1);
+    __ 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);
 }
 
 
 void CallICStub::GenerateMiss(MacroAssembler* masm) {
   FrameScope scope(masm, StackFrame::INTERNAL);
 
-  // Push the receiver and the function and feedback info.
-  __ Push(a1, a2, a3);
+  __ SmiTag(a0);
+  // Push number of arguments, receiver, function and feedback info.
+  __ Push(a0, a1, a2, a3);
 
   // Call the entry.
   __ CallRuntime(Runtime::kCallIC_Miss);
 
   // Move result to a1 and exit the internal frame.
   __ mov(a1, v0);
+
+  // Restore a0.
+  __ 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 3427 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS