text: // 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_X64
  
  #include "src/interface-descriptors.h"
  
  namespace v8 {
  namespace internal {
  
  const Register CallInterfaceDescriptor::ContextRegister() { return rsi; }
  
  void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
      CallInterfaceDescriptorData* data, int register_parameter_count) {
    const Register default_stub_registers[] = {rax, rbx, rcx, rdx, rdi};
    CHECK_LE(static_cast<size_t>(register_parameter_count),
             arraysize(default_stub_registers));
    data->InitializePlatformSpecific(register_parameter_count,
                                     default_stub_registers);
  }
  
  void RecordWriteDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    const Register default_stub_registers[] = {arg_reg_1, arg_reg_2, arg_reg_3,
                                               arg_reg_4, kReturnRegister0};
  
    data->RestrictAllocatableRegisters(default_stub_registers,
                                       arraysize(default_stub_registers));
  
    CHECK_LE(static_cast<size_t>(kParameterCount),
             arraysize(default_stub_registers));
    data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
  }
  
  const Register FastNewFunctionContextDescriptor::FunctionRegister() {
    return rdi;
  }
  const Register FastNewFunctionContextDescriptor::SlotsRegister() { return rax; }
  
  const Register LoadDescriptor::ReceiverRegister() { return rdx; }
  const Register LoadDescriptor::NameRegister() { return rcx; }
  const Register LoadDescriptor::SlotRegister() { return rax; }
  
  const Register LoadWithVectorDescriptor::VectorRegister() { return rbx; }
  
  const Register StoreDescriptor::ReceiverRegister() { return rdx; }
  const Register StoreDescriptor::NameRegister() { return rcx; }
  const Register StoreDescriptor::ValueRegister() { return rax; }
  const Register StoreDescriptor::SlotRegister() { return rdi; }
  
  const Register StoreWithVectorDescriptor::VectorRegister() { return rbx; }
  
  const Register StoreTransitionDescriptor::SlotRegister() { return rdi; }
  const Register StoreTransitionDescriptor::VectorRegister() { return rbx; }
  const Register StoreTransitionDescriptor::MapRegister() { return r11; }
  
  const Register ApiGetterDescriptor::HolderRegister() { return rcx; }
  const Register ApiGetterDescriptor::CallbackRegister() { return rbx; }
  
  const Register MathPowTaggedDescriptor::exponent() { return rdx; }
  
  const Register MathPowIntegerDescriptor::exponent() {
    return MathPowTaggedDescriptor::exponent();
  }
  
  
  const Register GrowArrayElementsDescriptor::ObjectRegister() { return rax; }
  const Register GrowArrayElementsDescriptor::KeyRegister() { return rbx; }
  
  
  void TypeofDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  
  // static
  const Register TypeConversionDescriptor::ArgumentRegister() { return rax; }
  
  void CallFunctionDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rdi};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void CallTrampolineDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments
    // rdi : the target to call
    Register registers[] = {rdi, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void CallVarargsDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments (on the stack, not including receiver)
    // rdi : the target to call
    // rbx : arguments list (FixedArray)
    // rcx : arguments list length (untagged)
    Register registers[] = {rdi, rax, rbx, rcx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void CallForwardVarargsDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments
    // rcx : start index (to support rest parameters)
    // rdi : the target to call
    Register registers[] = {rdi, rax, rcx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void CallWithSpreadDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments (on the stack, not including receiver)
    // rdi : the target to call
    // rbx : the object to spread
    Register registers[] = {rdi, rax, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void CallWithArrayLikeDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rdi : the target to call
    // rbx : the arguments list
    Register registers[] = {rdi, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ConstructVarargsDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments (on the stack, not including receiver)
    // rdi : the target to call
    // rdx : the new target
    // rbx : arguments list (FixedArray)
    // rcx : arguments list length (untagged)
    Register registers[] = {rdi, rdx, rax, rbx, rcx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ConstructForwardVarargsDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments
    // rdx : the new target
    // rcx : start index (to support rest parameters)
    // rdi : the target to call
    Register registers[] = {rdi, rdx, rax, rcx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ConstructWithSpreadDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments (on the stack, not including receiver)
    // rdi : the target to call
    // rdx : the new target
    // rbx : the object to spread
    Register registers[] = {rdi, rdx, rax, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ConstructWithArrayLikeDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rdi : the target to call
    // rdx : the new target
    // rbx : the arguments list
    Register registers[] = {rdi, rdx, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ConstructStubDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments
    // rdx : the new target
    // rdi : the target to call
    // rbx : allocation site or undefined
    Register registers[] = {rdi, rdx, rax, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  
  void ConstructTrampolineDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // rax : number of arguments
    // rdx : the new target
    // rdi : the target to call
    Register registers[] = {rdi, rdx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  
  void TransitionElementsKindDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rax, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void AbortJSDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rdx};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    data->InitializePlatformSpecific(0, nullptr, nullptr);
  }
  
  void ArrayConstructorDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // kTarget, kNewTarget, kActualArgumentsCount, kAllocationSite
    Register registers[] = {rdi, rdx, rax, rbx};
    data->InitializePlatformSpecific(arraysize(registers), registers, nullptr);
  }
  
  void ArrayNoArgumentConstructorDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // register state
    // rax -- number of arguments
    // rdi -- function
    // rbx -- allocation site with elements kind
    Register registers[] = {rdi, rbx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers, nullptr);
  }
  
  void ArraySingleArgumentConstructorDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // register state
    // rax -- number of arguments
    // rdi -- function
    // rbx -- allocation site with elements kind
    Register registers[] = {rdi, rbx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers, nullptr);
  }
  
  void ArrayNArgumentsConstructorDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    // register state
    // rax -- number of arguments
    // rdi -- function
    // rbx -- allocation site with elements kind
    Register registers[] = {rdi, rbx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers, nullptr);
  }
  
  void CompareDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rdx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  
  void BinaryOpDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rdx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void StringAddDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {rdx, rax};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ArgumentAdaptorDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        rdi,  // JSFunction
        rdx,  // the new target
        rax,  // actual number of arguments
        rbx,  // expected number of arguments
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ApiCallbackDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        JavaScriptFrame::context_register(),  // callee context
        rbx,                                  // call_data
        rcx,                                  // holder
        rdx,                                  // api_function_address
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void InterpreterDispatchDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        kInterpreterAccumulatorRegister, kInterpreterBytecodeOffsetRegister,
        kInterpreterBytecodeArrayRegister, kInterpreterDispatchTableRegister};
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void InterpreterPushArgsThenCallDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        rax,  // argument count (not including receiver)
        rbx,  // address of first argument
        rdi   // the target callable to be call
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void InterpreterPushArgsThenConstructDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        rax,  // argument count (not including receiver)
        rdx,  // new target
        rdi,  // constructor
        rbx,  // allocation site feedback if available, undefined otherwise
        rcx,  // address of first argument
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void InterpreterCEntryDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        rax,  // argument count (argc)
        r15,  // address of first argument (argv)
        rbx   // the runtime function to call
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void ResumeGeneratorDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        rax,  // the value to pass to the generator
        rdx   // the JSGeneratorObject / JSAsyncGeneratorObject to resume
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  void FrameDropperTrampolineDescriptor::InitializePlatformSpecific(
      CallInterfaceDescriptorData* data) {
    Register registers[] = {
        rbx,  // loaded new FP
    };
    data->InitializePlatformSpecific(arraysize(registers), registers);
  }
  
  }  // namespace internal
  }  // namespace v8
  
  #endif  // V8_TARGET_ARCH_X64
  