MIPS: The IC exposes a register definition.

Port r22011 (be22370)

Original commit message:
Centralize a register definition in an IC that provides:
1) symbolic names for the register (like, edx == receiver)
2) defines ordering when passed on the stack

Code that implements or uses the IC should use this definition instead of "knowing" what the registers are. Or at least have the definition to validate it's assumptions.

As a side effect of avoiding runtime static initializers (enforced by tools/check-static-initializers.sh, neat), I gave ownership of the registers array to CodeStubInterfaceDescriptor. This prompted a cleanup of that struct.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/354863002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22021 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -18,180 +18,128 @@ namespace internal {
 
 void FastNewClosureStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a2 };
+  Register registers[] = { a2 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(
-  descriptor->register_params_ = registers;
+      ARRAY_SIZE(registers), registers,
-  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kHiddenNewClosureFromStubFailure)->entry);
-      Runtime::FunctionForId(Runtime::kNewClosureFromStubFailure)->entry;
 }
 
 
 void FastNewContextStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1 };
+  Register registers[] = { a1 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
 }
 
 
 void ToNumberStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0 };
+  Register registers[] = { a0 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
 }
 
 
 void NumberToStringStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0 };
+  Register registers[] = { a0 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(
-  descriptor->register_params_ = registers;
+      ARRAY_SIZE(registers), registers,
-  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kHiddenNumberToString)->entry);
-      Runtime::FunctionForId(Runtime::kNumberToStringRT)->entry;
 }
 
 
 void FastCloneShallowArrayStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a3, a2, a1 };
+  Register registers[] = { a3, a2, a1 };
-  descriptor->register_param_count_ = 3;
+  Representation representations[] = {
-  descriptor->register_params_ = registers;
-  static Representation representations[] = {
     Representation::Tagged(),
     Representation::Smi(),
     Representation::Tagged() };
-  descriptor->register_param_representations_ = representations;
+  descriptor->Initialize(
-  descriptor->deoptimization_handler_ =
+      ARRAY_SIZE(registers), registers,
-      Runtime::FunctionForId(Runtime::kCreateArrayLiteralStubBailout)->entry;
+      Runtime::FunctionForId(
+          Runtime::kHiddenCreateArrayLiteralStubBailout)->entry,
+      representations);
 }
 
 
 void FastCloneShallowObjectStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a3, a2, a1, a0 };
+  Register registers[] = { a3, a2, a1, a0 };
-  descriptor->register_param_count_ = 4;
+  descriptor->Initialize(
-  descriptor->register_params_ = registers;
+      ARRAY_SIZE(registers), registers,
-  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kHiddenCreateObjectLiteral)->entry);
-      Runtime::FunctionForId(Runtime::kCreateObjectLiteral)->entry;
 }
 
 
 void CreateAllocationSiteStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a2, a3 };
+  Register registers[] = { a2, a3 };
-  descriptor->register_param_count_ = 2;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
-}
-
-
-void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1, a0 };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
-}
-
-
-void KeyedLoadDictionaryElementStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = {a1, a0 };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
 }
 
 
 void RegExpConstructResultStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a2, a1, a0 };
+  Register registers[] = { a2, a1, a0 };
-  descriptor->register_param_count_ = 3;
+  descriptor->Initialize(
-  descriptor->register_params_ = registers;
+      ARRAY_SIZE(registers), registers,
-  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kHiddenRegExpConstructResult)->entry);
-      Runtime::FunctionForId(Runtime::kRegExpConstructResult)->entry;
-}
-
-
-void KeyedLoadGenericElementStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1, a0 };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kKeyedGetProperty)->entry;
 }
 
 
 void LoadFieldStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0 };
+  Register registers[] = { a0 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
 }
 
 
 void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1 };
+  Register registers[] = { a1 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
 }
 
 
 void StringLengthStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0, a2 };
+  Register registers[] = { a0, a2 };
-  descriptor->register_param_count_ = 2;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
 }
 
 
 void KeyedStringLengthStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1, a0 };
+  Register registers[] = { a1, a0 };
-  descriptor->register_param_count_ = 2;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
 }
 
 
 void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a2, a1, a0 };
+  Register registers[] = { a2, a1, a0 };
-  descriptor->register_param_count_ = 3;
+  descriptor->Initialize(
-  descriptor->register_params_ = registers;
+      ARRAY_SIZE(registers), registers,
-  descriptor->deoptimization_handler_ =
+      FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure));
-      FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure);
 }
 
 
 void TransitionElementsKindStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0, a1 };
+  Register registers[] = { a0, a1 };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
   Address entry =
       Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry;
-  descriptor->deoptimization_handler_ = FUNCTION_ADDR(entry);
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(entry));
 }
 
 
 void CompareNilICStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0 };
+  Register registers[] = { a0 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-  descriptor->register_params_ = registers;
+                         FUNCTION_ADDR(CompareNilIC_Miss));
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(CompareNilIC_Miss);
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kCompareNilIC_Miss), isolate()));
 }
@@ -204,29 +152,31 @@ static void InitializeArrayConstructorDescriptor(
   // a0 -- number of arguments
   // a1 -- function
   // a2 -- allocation site with elements kind
-  static Register registers_variable_args[] = { a1, a2, a0 };
+  Address deopt_handler = Runtime::FunctionForId(
-  static Register registers_no_args[] = { a1, a2 };
+      Runtime::kHiddenArrayConstructor)->entry;
 
   if (constant_stack_parameter_count == 0) {
-    descriptor->register_param_count_ = 2;
+    Register registers[] = { a1, a2 };
-    descriptor->register_params_ = registers_no_args;
+    descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                           deopt_handler,
+                           NULL,
+                           constant_stack_parameter_count,
+                           JS_FUNCTION_STUB_MODE);
   } else {
     // stack param count needs (constructor pointer, and single argument)
-    descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
+    Register registers[] = { a1, a2, a0 };
-    descriptor->stack_parameter_count_ = a0;
+    Representation representations[] = {
-    descriptor->register_param_count_ = 3;
-    descriptor->register_params_ = registers_variable_args;
-    static Representation representations[] = {
         Representation::Tagged(),
         Representation::Tagged(),
         Representation::Integer32() };
-    descriptor->register_param_representations_ = representations;
+    descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                           a0,
+                           deopt_handler,
+                           representations,
+                           constant_stack_parameter_count,
+                           JS_FUNCTION_STUB_MODE,
+                           PASS_ARGUMENTS);
   }
-
-  descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
-  descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kArrayConstructor)->entry;
 }
 
 
@@ -236,28 +186,30 @@ static void InitializeInternalArrayConstructorDescriptor(
   // register state
   // a0 -- number of arguments
   // a1 -- constructor function
-  static Register registers_variable_args[] = { a1, a0 };
+  Address deopt_handler = Runtime::FunctionForId(
-  static Register registers_no_args[] = { a1 };
+      Runtime::kHiddenInternalArrayConstructor)->entry;
 
   if (constant_stack_parameter_count == 0) {
-    descriptor->register_param_count_ = 1;
+    Register registers[] = { a1 };
-    descriptor->register_params_ = registers_no_args;
+    descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                           deopt_handler,
+                           NULL,
+                           constant_stack_parameter_count,
+                           JS_FUNCTION_STUB_MODE);
   } else {
     // stack param count needs (constructor pointer, and single argument)
-    descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
+    Register registers[] = { a1, a0 };
-    descriptor->stack_parameter_count_ = a0;
+    Representation representations[] = {
-    descriptor->register_param_count_ = 2;
-    descriptor->register_params_ = registers_variable_args;
-    static Representation representations[] = {
         Representation::Tagged(),
         Representation::Integer32() };
-    descriptor->register_param_representations_ = representations;
+    descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                           a0,
+                           deopt_handler,
+                           representations,
+                           constant_stack_parameter_count,
+                           JS_FUNCTION_STUB_MODE,
+                           PASS_ARGUMENTS);
   }
-
-  descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
-  descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kInternalArrayConstructor)->entry;
 }
 
 
@@ -281,11 +233,9 @@ void ArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
 
 void ToBooleanStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0 };
+  Register registers[] = { a0 };
-  descriptor->register_param_count_ = 1;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-  descriptor->register_params_ = registers;
+                         FUNCTION_ADDR(ToBooleanIC_Miss));
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(ToBooleanIC_Miss);
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kToBooleanIC_Miss), isolate()));
 }
@@ -311,30 +261,25 @@ void InternalArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
 
 void StoreGlobalStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1, a2, a0 };
+  Register registers[] = { a1, a2, a0 };
-  descriptor->register_param_count_ = 3;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-  descriptor->register_params_ = registers;
+                         FUNCTION_ADDR(StoreIC_MissFromStubFailure));
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(StoreIC_MissFromStubFailure);
 }
 
 
 void ElementsTransitionAndStoreStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a0, a3, a1, a2 };
+  Register registers[] = { a0, a3, a1, a2 };
-  descriptor->register_param_count_ = 4;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-  descriptor->register_params_ = registers;
+                         FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss));
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss);
 }
 
 
 void BinaryOpICStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1, a0 };
+  Register registers[] = { a1, a0 };
-  descriptor->register_param_count_ = 2;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-  descriptor->register_params_ = registers;
+                         FUNCTION_ADDR(BinaryOpIC_Miss));
-  descriptor->deoptimization_handler_ = FUNCTION_ADDR(BinaryOpIC_Miss);
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kBinaryOpIC_Miss), isolate()));
 }
@@ -342,21 +287,18 @@ void BinaryOpICStub::InitializeInterfaceDescriptor(
 
 void BinaryOpWithAllocationSiteStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a2, a1, a0 };
+  Register registers[] = { a2, a1, a0 };
-  descriptor->register_param_count_ = 3;
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
-  descriptor->register_params_ = registers;
+                         FUNCTION_ADDR(BinaryOpIC_MissWithAllocationSite));
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(BinaryOpIC_MissWithAllocationSite);
 }
 
 
 void StringAddStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { a1, a0 };
+  Register registers[] = { a1, a0 };
-  descriptor->register_param_count_ = 2;
+  descriptor->Initialize(
-  descriptor->register_params_ = registers;
+      ARRAY_SIZE(registers), registers,
-  descriptor->deoptimization_handler_ =
+      Runtime::FunctionForId(Runtime::kHiddenStringAdd)->entry);
-      Runtime::FunctionForId(Runtime::kStringAdd)->entry;
 }
 
 
@@ -466,21 +408,21 @@ void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm) {
   isolate()->counters()->code_stubs()->Increment();
 
   CodeStubInterfaceDescriptor* descriptor = GetInterfaceDescriptor();
-  int param_count = descriptor->register_param_count_;
+  int param_count = descriptor->register_param_count();
   {
     // Call the runtime system in a fresh internal frame.
     FrameScope scope(masm, StackFrame::INTERNAL);
-    ASSERT(descriptor->register_param_count_ == 0 ||
+    ASSERT(descriptor->register_param_count() == 0 ||
-           a0.is(descriptor->register_params_[param_count - 1]));
+           a0.is(descriptor->GetParameterRegister(param_count - 1)));
     // Push arguments, adjust sp.
     __ Subu(sp, sp, Operand(param_count * kPointerSize));
     for (int i = 0; i < param_count; ++i) {
       // Store argument to stack.
-      __ sw(descriptor->register_params_[i],
+      __ sw(descriptor->GetParameterRegister(i),
             MemOperand(sp, (param_count-1-i) * kPointerSize));
     }
     ExternalReference miss = descriptor->miss_handler();
-    __ CallExternalReference(miss, descriptor->register_param_count_);
+    __ CallExternalReference(miss, descriptor->register_param_count());
   }
 
   __ Ret();

src/mips/deoptimizer-mips.cc

@@ -101,7 +101,7 @@ void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) {
 
 void Deoptimizer::SetPlatformCompiledStubRegisters(
     FrameDescription* output_frame, CodeStubInterfaceDescriptor* descriptor) {
-  ApiFunction function(descriptor->deoptimization_handler_);
+  ApiFunction function(descriptor->deoptimization_handler());
   ExternalReference xref(&function, ExternalReference::BUILTIN_CALL, isolate_);
   intptr_t handler = reinterpret_cast<intptr_t>(xref.address());
   int params = descriptor->GetHandlerParameterCount();

src/mips/ic-mips.cc

@@ -560,6 +560,13 @@ void KeyedLoadIC::GenerateMiss(MacroAssembler* masm) {
 }
 
 
+// IC register specifications
+const Register LoadIC::ReceiverRegister() { return a0; }
+const Register LoadIC::NameRegister() { return a2; }
+const Register KeyedLoadIC::ReceiverRegister() { return a1; }
+const Register KeyedLoadIC::NameRegister() { return a0; }
+
+
 void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
   // ---------- S t a t e --------------
   //  -- ra     : return address

src/mips/stub-cache-mips.cc

@@ -1253,14 +1253,18 @@ Handle<Code> LoadStubCompiler::CompileLoadNonexistent(Handle<HeapType> type,
 
 Register* LoadStubCompiler::registers() {
   // receiver, name, scratch1, scratch2, scratch3, scratch4.
-  static Register registers[] = { a0, a2, a3, a1, t0, t1 };
+  Register receiver = LoadIC::ReceiverRegister();
+  Register name = LoadIC::NameRegister();
+  static Register registers[] = { receiver, name, a3, a1, t0, t1 };
   return registers;
 }
 
 
 Register* KeyedLoadStubCompiler::registers() {
   // receiver, name, scratch1, scratch2, scratch3, scratch4.
-  static Register registers[] = { a1, a0, a2, a3, t0, t1 };
+  Register receiver = KeyedLoadIC::ReceiverRegister();
+  Register name = KeyedLoadIC::NameRegister();
+  static Register registers[] = { receiver, name, a2, a3, t0, t1 };
   return registers;
 }