The IC exposes a register definition.

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 "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/regexp-macro-assembler.h"
 #include "src/runtime.h"
 #include "src/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 
 void FastNewClosureStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rbx };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kHiddenNewClosureFromStubFailure)->entry;
+  Register registers[] = { rbx };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      Runtime::FunctionForId(Runtime::kHiddenNewClosureFromStubFailure)->entry);
 }
 
 
 void FastNewContextStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdi };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  Register registers[] = { rdi };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void ToNumberStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  Register registers[] = { rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void NumberToStringStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kHiddenNumberToString)->entry;
+  Register registers[] = { rax };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      Runtime::FunctionForId(Runtime::kHiddenNumberToString)->entry);
 }
 
 
 void FastCloneShallowArrayStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax, rbx, rcx };
-  descriptor->register_param_count_ = 3;
-  descriptor->register_params_ = registers;
-  static Representation representations[] = {
+  Register registers[] = { rax, rbx, rcx };
+  Representation representations[] = {
     Representation::Tagged(),
     Representation::Smi(),
     Representation::Tagged() };
-  descriptor->register_param_representations_ = representations;
-  descriptor->deoptimization_handler_ =
+
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
       Runtime::FunctionForId(
-          Runtime::kHiddenCreateArrayLiteralStubBailout)->entry;
+          Runtime::kHiddenCreateArrayLiteralStubBailout)->entry,
+      representations);
 }
 
 
 void FastCloneShallowObjectStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax, rbx, rcx, rdx };
-  descriptor->register_param_count_ = 4;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kHiddenCreateObjectLiteral)->entry;
+  Register registers[] = { rax, rbx, rcx, rdx };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      Runtime::FunctionForId(Runtime::kHiddenCreateObjectLiteral)->entry);
 }
 
 
 void CreateAllocationSiteStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rbx, rdx };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
-}
-
-
-void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rax };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
-}
-
-
-void KeyedLoadDictionaryElementStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rax };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-    FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
+  Register registers[] = { rbx, rdx };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void RegExpConstructResultStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rcx, rbx, rax };
-  descriptor->register_param_count_ = 3;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kHiddenRegExpConstructResult)->entry;
-}
-
-
-void KeyedLoadGenericElementStub::InitializeInterfaceDescriptor(
-    CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rax };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kKeyedGetProperty)->entry;
+  Register registers[] = { rcx, rbx, rax };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      Runtime::FunctionForId(Runtime::kHiddenRegExpConstructResult)->entry);
 }
 
 
 void LoadFieldStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  Register registers[] = { rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  Register registers[] = { rdx };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void StringLengthStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax, rcx };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  Register registers[] = { rax, rcx };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void KeyedStringLengthStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rax };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = NULL;
+  Register registers[] = { rdx, rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers);
 }
 
 
 void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rcx, rax };
-  descriptor->register_param_count_ = 3;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure);
+  Register registers[] = { rdx, rcx, rax };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure));
 }
 
 
 void TransitionElementsKindStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax, rbx };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry;
+  Register registers[] = { rax, rbx };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry);
 }
 
 
 static void InitializeArrayConstructorDescriptor(
     CodeStubInterfaceDescriptor* descriptor,
     int constant_stack_parameter_count) {
   // register state
   // rax -- number of arguments
   // rdi -- function
   // rbx -- allocation site with elements kind
-  static Register registers_variable_args[] = { rdi, rbx, rax };
-  static Register registers_no_args[] = { rdi, rbx };
+  Address deopt_handler = Runtime::FunctionForId(
+      Runtime::kHiddenArrayConstructor)->entry;
 
   if (constant_stack_parameter_count == 0) {
-    descriptor->register_param_count_ = 2;
-    descriptor->register_params_ = registers_no_args;
+    Register registers[] = { rdi, rbx };
+    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;
-    descriptor->stack_parameter_count_ = rax;
-    descriptor->register_param_count_ = 3;
-    static Representation representations[] = {
+    Register registers[] = { rdi, rbx, rax };
+    Representation representations[] = {
         Representation::Tagged(),
         Representation::Tagged(),
         Representation::Integer32() };
-    descriptor->register_param_representations_ = representations;
-    descriptor->register_params_ = registers_variable_args;
+    descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                           rax,
+                           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::kHiddenArrayConstructor)->entry;
 }
 
 
 static void InitializeInternalArrayConstructorDescriptor(
     CodeStubInterfaceDescriptor* descriptor,
     int constant_stack_parameter_count) {
   // register state
   // rax -- number of arguments
   // rdi -- constructor function
-  static Register registers_variable_args[] = { rdi, rax };
-  static Register registers_no_args[] = { rdi };
+  Address deopt_handler = Runtime::FunctionForId(
+      Runtime::kHiddenInternalArrayConstructor)->entry;
 
   if (constant_stack_parameter_count == 0) {
-    descriptor->register_param_count_ = 1;
-    descriptor->register_params_ = registers_no_args;
+    Register registers[] = { rdi };
+    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;
-    descriptor->stack_parameter_count_ = rax;
-    descriptor->register_param_count_ = 2;
-    descriptor->register_params_ = registers_variable_args;
-    static Representation representations[] = {
+    Register registers[] = { rdi, rax };
+    Representation representations[] = {
         Representation::Tagged(),
         Representation::Integer32() };
-    descriptor->register_param_representations_ = representations;
+    descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                           rax,
+                           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::kHiddenInternalArrayConstructor)->entry;
 }
 
 
 void ArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
   InitializeArrayConstructorDescriptor(descriptor, 0);
 }
 
 
 void ArraySingleArgumentConstructorStub::InitializeInterfaceDescriptor(
@@ skipping 21 matching lines @@
 
 
 void InternalArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
   InitializeInternalArrayConstructorDescriptor(descriptor, -1);
 }
 
 
 void CompareNilICStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(CompareNilIC_Miss);
+  Register registers[] = { rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(CompareNilIC_Miss));
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kCompareNilIC_Miss), isolate()));
 }
 
 
 void ToBooleanStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax };
-  descriptor->register_param_count_ = 1;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-     FUNCTION_ADDR(ToBooleanIC_Miss);
+  Register registers[] = { rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(ToBooleanIC_Miss));
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kToBooleanIC_Miss), isolate()));
 }
 
 
 void StoreGlobalStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rcx, rax };
-  descriptor->register_param_count_ = 3;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(StoreIC_MissFromStubFailure);
+  Register registers[] = { rdx, rcx, rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(StoreIC_MissFromStubFailure));
 }
 
 
 void ElementsTransitionAndStoreStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rax, rbx, rcx, rdx };
-  descriptor->register_param_count_ = 4;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss);
+  Register registers[] = { rax, rbx, rcx, rdx };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss));
 }
 
 
 void BinaryOpICStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rax };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ = FUNCTION_ADDR(BinaryOpIC_Miss);
+  Register registers[] = { rdx, rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(BinaryOpIC_Miss));
   descriptor->SetMissHandler(
       ExternalReference(IC_Utility(IC::kBinaryOpIC_Miss), isolate()));
 }
 
 
 void BinaryOpWithAllocationSiteStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rcx, rdx, rax };
-  descriptor->register_param_count_ = 3;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      FUNCTION_ADDR(BinaryOpIC_MissWithAllocationSite);
+  Register registers[] = { rcx, rdx, rax };
+  descriptor->Initialize(ARRAY_SIZE(registers), registers,
+                         FUNCTION_ADDR(BinaryOpIC_MissWithAllocationSite));
 }
 
 
 void StringAddStub::InitializeInterfaceDescriptor(
     CodeStubInterfaceDescriptor* descriptor) {
-  static Register registers[] = { rdx, rax };
-  descriptor->register_param_count_ = 2;
-  descriptor->register_params_ = registers;
-  descriptor->deoptimization_handler_ =
-      Runtime::FunctionForId(Runtime::kHiddenStringAdd)->entry;
+  Register registers[] = { rdx, rax };
+  descriptor->Initialize(
+      ARRAY_SIZE(registers), registers,
+      Runtime::FunctionForId(Runtime::kHiddenStringAdd)->entry);
 }
 
 
 void CallDescriptors::InitializeForIsolate(Isolate* isolate) {
   {
     CallInterfaceDescriptor* descriptor =
         isolate->call_descriptor(Isolate::ArgumentAdaptorCall);
     static Register registers[] = { rdi,  // JSFunction
                                     rsi,  // context
                                     rax,  // actual number of arguments
@@ skipping 75 matching lines @@
 
 
 #define __ ACCESS_MASM(masm)
 
 
 void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm) {
   // Update the static counter each time a new code stub is generated.
   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 ||
-           rax.is(descriptor->register_params_[param_count - 1]));
+    ASSERT(descriptor->register_param_count() == 0 ||
+           rax.is(descriptor->GetParameterRegister(param_count - 1)));
     // Push arguments
     for (int i = 0; i < param_count; ++i) {
-      __ Push(descriptor->register_params_[i]);
+      __ Push(descriptor->GetParameterRegister(i));
     }
     ExternalReference miss = descriptor->miss_handler();
-    __ CallExternalReference(miss, descriptor->register_param_count_);
+    __ CallExternalReference(miss, descriptor->register_param_count());
   }
 
   __ Ret();
 }
 
 
 void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
   __ PushCallerSaved(save_doubles_);
   const int argument_count = 1;
   __ PrepareCallCFunction(argument_count);
@@ skipping 4569 matching lines @@
                               return_value_operand,
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64