Make concrete classes for individual call descriptors.

src/interface-descriptors.h

 // Copyright 2014 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.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include "src/assembler.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 class PlatformInterfaceDescriptor;
 
-class CallInterfaceDescriptor {
+#define INTERFACE_DESCRIPTOR_LIST(V)          \
+  V(Load)                                     \
+  V(Store)                                    \
+  V(ElementTransitionAndStore)                \
+  V(Instanceof)                               \
+  V(VectorLoadIC)                             \
+  V(FastNewClosure)                           \
+  V(FastNewContext)                           \
+  V(ToNumber)                                 \
+  V(NumberToString)                           \
+  V(FastCloneShallowArray)                    \
+  V(FastCloneShallowObject)                   \
+  V(CreateAllocationSite)                     \
+  V(CallFunction)                             \
+  V(CallConstruct)                            \
+  V(RegExpConstructResult)                    \
+  V(TransitionElementsKind)                   \
+  V(ArrayConstructorConstantArgCount)         \
+  V(ArrayConstructor)                         \
+  V(InternalArrayConstructorConstantArgCount) \
+  V(InternalArrayConstructor)                 \
+  V(CompareNil)                               \
+  V(ToBoolean)                                \
+  V(BinaryOp)                                 \
+  V(BinaryOpWithAllocationSite)               \
+  V(StringAdd)                                \
+  V(Keyed)                                    \
+  V(Named)                                    \
+  V(CallHandler)                              \
+  V(ArgumentAdaptor)                          \
+  V(ApiFunction)
+
+
+class CallInterfaceDescriptorData {
  public:
-  CallInterfaceDescriptor() : register_param_count_(-1) {}
+  CallInterfaceDescriptorData() : register_param_count_(-1) {}
 
   // A copy of the passed in registers and param_representations is made
-  // and owned by the CallInterfaceDescriptor.
+  // and owned by the CallInterfaceDescriptorData.
 
   // TODO(mvstanton): Instead of taking parallel arrays register and
   // param_representations, how about a struct that puts the representation
   // and register side by side (eg, RegRep(r1, Representation::Tagged()).
   // The same should go for the CodeStubInterfaceDescriptor class.
   void Initialize(int register_parameter_count, Register* registers,
                   Representation* param_representations,
                   PlatformInterfaceDescriptor* platform_descriptor = NULL);
 
   bool IsInitialized() const { return register_param_count_ >= 0; }
 
-  int GetEnvironmentLength() const { return register_param_count_; }
+  int register_param_count() const { return register_param_count_; }
+  Register register_param(int index) const { return register_params_[index]; }
+  Register* register_params() const { return register_params_.get(); }
+  Representation register_param_representation(int index) const {
+    return register_param_representations_[index];
+  }
+  Representation* register_param_representations() const {
+    return register_param_representations_.get();
+  }
+  PlatformInterfaceDescriptor* platform_specific_descriptor() const {
+    return platform_specific_descriptor_;
+  }
 
-  int GetRegisterParameterCount() const { return register_param_count_; }
+ private:
+  int register_param_count_;
+
+  // The Register params are allocated dynamically by the
+  // InterfaceDescriptor, and freed on destruction. This is because static
+  // arrays of Registers cause creation of runtime static initializers
+  // which we don't want.
+  SmartArrayPointer<Register> register_params_;
+  // Specifies Representations for the stub's parameter. Points to an array of
+  // Representations of the same length of the numbers of parameters to the
+  // stub, or if NULL (the default value), Representation of each parameter
+  // assumed to be Tagged().
+  SmartArrayPointer<Representation> register_param_representations_;
+
+  PlatformInterfaceDescriptor* platform_specific_descriptor_;
+
+  DISALLOW_COPY_AND_ASSIGN(CallInterfaceDescriptorData);
+};
+
+
+class CallDescriptors {
+ public:
+  enum Key {
+#define DEF_ENUM(name) name,
+    INTERFACE_DESCRIPTOR_LIST(DEF_ENUM)
+#undef DEF_ENUM
+    NUMBER_OF_DESCRIPTORS
+  };
+
+  static void InitializeForIsolate(Isolate* isolate);
+};
+
+
+class CallInterfaceDescriptor {
+ public:
+  CallInterfaceDescriptor() : data_(NULL) {}
+
+  CallInterfaceDescriptor(Isolate* isolate, CallDescriptors::Key key)
+      : data_(isolate->call_descriptor_data(key)) {}

[Yang, 2014/09/03 09:24:34]

Can we simply
- fetch data from the isolate
- check whether it's initialized
- if not, initialize it by calling a virtual Initialize method defined on each
CallInterfaceDescriptor

That way we get rid of that eager initializiation in InitializeForIsolate, and
have on-demand lazy initialization.

The Initialize method could either be the way it is, passing isolate and
descriptor key, or it would simply pass a reference to an uninitialized
CallDescriptorData object already fetched via isolate->call_descriptor_data(key)
and would fill it accordingly. That way we could also get rid of the static
InitializeData method, which is essentially just a wrapper to fetch
isolate->call_descriptor_data(key).

+
+  bool IsInitialized() const {
+    return data() != NULL && data()->IsInitialized();

[Yang, 2014/09/03 09:24:34]

We then would also not need this any more. The constructor would make sure that
we have data_ set and that data_ is initialized.

+  }
+
+  int GetEnvironmentLength() const { return data()->register_param_count(); }
+
+  int GetRegisterParameterCount() const {
+    return data()->register_param_count();
+  }
 
   Register GetParameterRegister(int index) const {
-    return register_params_[index];
+    return data()->register_param(index);
   }
 
   Representation GetParameterRepresentation(int index) const {
-    DCHECK(index < register_param_count_);
-    if (register_param_representations_.get() == NULL) {
+    DCHECK(index < data()->register_param_count());
+    if (data()->register_param_representations() == NULL) {
       return Representation::Tagged();
     }
 
-    return register_param_representations_[index];
+    return data()->register_param_representation(index);
   }
 
   // "Environment" versions of parameter functions. The first register
   // parameter (context) is not included.
   int GetEnvironmentParameterCount() const {
     return GetEnvironmentLength() - 1;
   }
 
   Register GetEnvironmentParameterRegister(int index) const {
     return GetParameterRegister(index + 1);
   }
 
   Representation GetEnvironmentParameterRepresentation(int index) const {
     return GetParameterRepresentation(index + 1);
   }
 
   // Some platforms have extra information to associate with the descriptor.
   PlatformInterfaceDescriptor* platform_specific_descriptor() const {
-    return platform_specific_descriptor_;
+    return data()->platform_specific_descriptor();
   }
 
   static const Register ContextRegister();
 
+ protected:
+  const CallInterfaceDescriptorData* data() const { return data_; }
+
+  static void InitializeData(
+      Isolate* isolate, CallDescriptors::Key key, int register_parameter_count,
+      Register* registers, Representation* param_representations,
+      PlatformInterfaceDescriptor* platform_descriptor = NULL) {
+    isolate->call_descriptor_data(key)
+        ->Initialize(register_parameter_count, registers, param_representations,
+                     platform_descriptor);
+  }
+
  private:
-  int register_param_count_;
-
-  // The Register params are allocated dynamically by the
-  // InterfaceDescriptor, and freed on destruction. This is because static
-  // arrays of Registers cause creation of runtime static initializers
-  // which we don't want.
-  SmartArrayPointer<Register> register_params_;
-  // Specifies Representations for the stub's parameter. Points to an array of
-  // Representations of the same length of the numbers of parameters to the
-  // stub, or if NULL (the default value), Representation of each parameter
-  // assumed to be Tagged().
-  SmartArrayPointer<Representation> register_param_representations_;
-
-  PlatformInterfaceDescriptor* platform_specific_descriptor_;
-
-  DISALLOW_COPY_AND_ASSIGN(CallInterfaceDescriptor);
-};
-
-
-enum CallDescriptorKey {
-  LoadICCall,
-  StoreICCall,
-  ElementTransitionAndStoreCall,
-  InstanceofCall,
-  VectorLoadICCall,
-  FastNewClosureCall,
-  FastNewContextCall,
-  ToNumberCall,
-  NumberToStringCall,
-  FastCloneShallowArrayCall,
-  FastCloneShallowObjectCall,
-  CreateAllocationSiteCall,
-  CallFunctionCall,
-  CallConstructCall,
-  RegExpConstructResultCall,
-  TransitionElementsKindCall,
-  ArrayConstructorConstantArgCountCall,
-  ArrayConstructorCall,
-  InternalArrayConstructorConstantArgCountCall,
-  InternalArrayConstructorCall,
-  CompareNilCall,
-  ToBooleanCall,
-  BinaryOpCall,
-  BinaryOpWithAllocationSiteCall,
-  StringAddCall,
-  KeyedCall,
-  NamedCall,
-  CallHandler,
-  ArgumentAdaptorCall,
-  ApiFunctionCall,
-  NUMBER_OF_CALL_DESCRIPTORS
-};
-
-
-class CallDescriptors {
- public:
-  static void InitializeForIsolate(Isolate* isolate);
-
- private:
-  static void InitializeForIsolateAllPlatforms(Isolate* isolate);
-};
+  const CallInterfaceDescriptorData* data_;
+};
+
+
+#define DECLARE_DESCRIPTOR(name)                                               \
+  explicit name(Isolate* isolate) : CallInterfaceDescriptor(isolate, key()) {} \
+  static inline CallDescriptors::Key key();                                    \
+  static void Initialize(Isolate* isolate);
+
+
+class LoadDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(LoadDescriptor)
+
+  enum ParameterIndices { kReceiverIndex, kNameIndex };
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+};
+
+
+class StoreDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(StoreDescriptor)
+
+  enum ParameterIndices {
+    kReceiverIndex,
+    kNameIndex,
+    kValueIndex,
+    kParameterCount
+  };
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+  static const Register ValueRegister();
+};
+
+
+class ElementTransitionAndStoreDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ElementTransitionAndStoreDescriptor)
+
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+  static const Register ValueRegister();
+  static const Register MapRegister();
+};
+
+
+class InstanceofDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(InstanceofDescriptor)
+
+  enum ParameterIndices { kLeftIndex, kRightIndex, kParameterCount };
+  static const Register left();
+  static const Register right();
+};
+
+
+class VectorLoadICDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(VectorLoadICDescriptor)
+
+  enum ParameterIndices {
+    kReceiverIndex,
+    kNameIndex,
+    kSlotIndex,
+    kVectorIndex,
+    kParameterCount
+  };
+
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+  static const Register SlotRegister();
+  static const Register VectorRegister();
+};
+
+
+class FastNewClosureDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(FastNewClosureDescriptor)
+};
+
+
+class FastNewContextDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(FastNewContextDescriptor)
+};
+
+
+class ToNumberDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ToNumberDescriptor)
+};
+
+
+class NumberToStringDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(NumberToStringDescriptor)
+};
+
+
+class FastCloneShallowArrayDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(FastCloneShallowArrayDescriptor)
+};
+
+
+class FastCloneShallowObjectDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(FastCloneShallowObjectDescriptor)
+};
+
+
+class CreateAllocationSiteDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(CreateAllocationSiteDescriptor)
+};
+
+
+class CallFunctionDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(CallFunctionDescriptor)
+};
+
+
+class CallConstructDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(CallConstructDescriptor)
+};
+
+
+class RegExpConstructResultDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(RegExpConstructResultDescriptor)
+};
+
+
+class TransitionElementsKindDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(TransitionElementsKindDescriptor)
+};
+
+
+class ArrayConstructorConstantArgCountDescriptor
+    : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ArrayConstructorConstantArgCountDescriptor)
+};
+
+
+class ArrayConstructorDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ArrayConstructorDescriptor)
+};
+
+
+class InternalArrayConstructorConstantArgCountDescriptor
+    : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(InternalArrayConstructorConstantArgCountDescriptor)
+};
+
+
+class InternalArrayConstructorDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(InternalArrayConstructorDescriptor)
+};
+
+
+class CompareNilDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(CompareNilDescriptor)
+};
+
+
+class ToBooleanDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ToBooleanDescriptor)
+};
+
+
+class BinaryOpDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(BinaryOpDescriptor)
+};
+
+
+class BinaryOpWithAllocationSiteDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(BinaryOpWithAllocationSiteDescriptor)
+};
+
+
+class StringAddDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(StringAddDescriptor)
+};
+
+
+class KeyedDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(KeyedDescriptor)
+};
+
+
+class NamedDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(NamedDescriptor)
+};
+
+
+class CallHandlerDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(CallHandlerDescriptor)
+};
+
+
+class ArgumentAdaptorDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ArgumentAdaptorDescriptor)
+};
+
+
+class ApiFunctionDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR(ApiFunctionDescriptor)
+};
+
+#undef DECLARE_DESCRIPTOR
+
+
+// We define the association between CallDescriptors::Key and the specialized
+// descriptor here to reduce boilerplate and mistakes.
+#define DEF_KEY(name) \
+  CallDescriptors::Key name##Descriptor::key() { return CallDescriptors::name; }
+INTERFACE_DESCRIPTOR_LIST(DEF_KEY)
+#undef DEF_KEY
 }
 }  // namespace v8::internal
 
+
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_