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// Copyright 2018 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_CODEGEN_IA32_REGISTER_IA32_H_
#define V8_CODEGEN_IA32_REGISTER_IA32_H_
#include "src/codegen/register.h"
#include "src/codegen/reglist.h"
namespace v8 {
namespace internal {
#define GENERAL_REGISTERS(V) \
V(eax) \
V(ecx) \
V(edx) \
V(ebx) \
V(esp) \
V(ebp) \
V(esi) \
V(edi)
#define ALLOCATABLE_GENERAL_REGISTERS(V) \
V(eax) \
V(ecx) \
V(edx) \
V(esi) \
V(edi)
#define DOUBLE_REGISTERS(V) \
V(xmm0) \
V(xmm1) \
V(xmm2) \
V(xmm3) \
V(xmm4) \
V(xmm5) \
V(xmm6) \
V(xmm7)
#define FLOAT_REGISTERS DOUBLE_REGISTERS
#define SIMD128_REGISTERS DOUBLE_REGISTERS
#define ALLOCATABLE_DOUBLE_REGISTERS(V) \
V(xmm1) \
V(xmm2) \
V(xmm3) \
V(xmm4) \
V(xmm5) \
V(xmm6) \
V(xmm7)
enum RegisterCode {
#define REGISTER_CODE(R) kRegCode_##R,
GENERAL_REGISTERS(REGISTER_CODE)
#undef REGISTER_CODE
kRegAfterLast
};
class Register : public RegisterBase<Register, kRegAfterLast> {
public:
bool is_byte_register() const { return code() <= 3; }
private:
friend class RegisterBase<Register, kRegAfterLast>;
explicit constexpr Register(int code) : RegisterBase(code) {}
};
ASSERT_TRIVIALLY_COPYABLE(Register);
static_assert(sizeof(Register) == sizeof(int),
"Register can efficiently be passed by value");
#define DEFINE_REGISTER(R) \
constexpr Register R = Register::from_code(kRegCode_##R);
GENERAL_REGISTERS(DEFINE_REGISTER)
#undef DEFINE_REGISTER
constexpr Register no_reg = Register::no_reg();
// Returns the number of padding slots needed for stack pointer alignment.
constexpr int ArgumentPaddingSlots(int argument_count) {
// No argument padding required.
return 0;
}
constexpr bool kSimpleFPAliasing = true;
constexpr bool kSimdMaskRegisters = false;
enum DoubleCode {
#define REGISTER_CODE(R) kDoubleCode_##R,
DOUBLE_REGISTERS(REGISTER_CODE)
#undef REGISTER_CODE
kDoubleAfterLast
};
class XMMRegister : public RegisterBase<XMMRegister, kDoubleAfterLast> {
friend class RegisterBase<XMMRegister, kDoubleAfterLast>;
explicit constexpr XMMRegister(int code) : RegisterBase(code) {}
};
using FloatRegister = XMMRegister;
using DoubleRegister = XMMRegister;
using Simd128Register = XMMRegister;
#define DEFINE_REGISTER(R) \
constexpr DoubleRegister R = DoubleRegister::from_code(kDoubleCode_##R);
DOUBLE_REGISTERS(DEFINE_REGISTER)
#undef DEFINE_REGISTER
constexpr DoubleRegister no_dreg = DoubleRegister::no_reg();
// Note that the bit values must match those used in actual instruction encoding
constexpr int kNumRegs = 8;
// Caller-saved registers
constexpr RegList kJSCallerSaved =
Register::ListOf(eax, ecx, edx,
ebx, // used as caller-saved register in JavaScript code
edi); // callee function
constexpr int kNumJSCallerSaved = 5;
// Number of registers for which space is reserved in safepoints.
constexpr int kNumSafepointRegisters = 8;
// Define {RegisterName} methods for the register types.
DEFINE_REGISTER_NAMES(Register, GENERAL_REGISTERS)
DEFINE_REGISTER_NAMES(XMMRegister, DOUBLE_REGISTERS)
// Give alias names to registers for calling conventions.
constexpr Register kReturnRegister0 = eax;
constexpr Register kReturnRegister1 = edx;
constexpr Register kReturnRegister2 = edi;
constexpr Register kJSFunctionRegister = edi;
constexpr Register kContextRegister = esi;
constexpr Register kAllocateSizeRegister = edx;
constexpr Register kInterpreterAccumulatorRegister = eax;
constexpr Register kInterpreterBytecodeOffsetRegister = edx;
constexpr Register kInterpreterBytecodeArrayRegister = edi;
constexpr Register kInterpreterDispatchTableRegister = esi;
constexpr Register kJavaScriptCallArgCountRegister = eax;
constexpr Register kJavaScriptCallCodeStartRegister = ecx;
constexpr Register kJavaScriptCallTargetRegister = kJSFunctionRegister;
constexpr Register kJavaScriptCallNewTargetRegister = edx;
// The ExtraArg1Register not part of the real JS calling convention and is
// mostly there to simplify consistent interface descriptor definitions across
// platforms. Note that on ia32 it aliases kJavaScriptCallCodeStartRegister.
constexpr Register kJavaScriptCallExtraArg1Register = ecx;
// The off-heap trampoline does not need a register on ia32 (it uses a
// pc-relative call instead).
constexpr Register kOffHeapTrampolineRegister = no_reg;
constexpr Register kRuntimeCallFunctionRegister = edx;
constexpr Register kRuntimeCallArgCountRegister = eax;
constexpr Register kRuntimeCallArgvRegister = ecx;
constexpr Register kWasmInstanceRegister = esi;
constexpr Register kWasmCompileLazyFuncIndexRegister = edi;
constexpr Register kRootRegister = ebx;
// TODO(860429): Remove remaining poisoning infrastructure on ia32.
constexpr Register kSpeculationPoisonRegister = no_reg;
constexpr DoubleRegister kFPReturnRegister0 = xmm1; // xmm0 isn't allocatable.
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_IA32_REGISTER_IA32_H_
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