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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_CONSTANTS_X64_H_
#define RUNTIME_VM_CONSTANTS_X64_H_
#ifndef RUNTIME_VM_CONSTANTS_H_
#error Do not include constants_x64.h directly; use constants.h instead.
#endif
#include "platform/assert.h"
#include "platform/globals.h"
#include "platform/utils.h"
#include "vm/constants_base.h"
namespace dart {
#define R(reg) (static_cast<RegList>(1) << (reg))
enum Register {
RAX = 0,
RCX = 1,
RDX = 2,
RBX = 3,
RSP = 4, // SP
RBP = 5, // FP
RSI = 6,
RDI = 7,
R8 = 8,
R9 = 9,
R10 = 10,
R11 = 11, // TMP
R12 = 12, // CODE_REG
R13 = 13,
R14 = 14, // THR
R15 = 15, // PP
kNumberOfCpuRegisters = 16,
kNoRegister = -1, // Signals an illegal register.
};
enum ByteRegister {
AL = 0,
CL = 1,
DL = 2,
BL = 3,
AH = 4,
CH = 5,
DH = 6,
BH = 7,
SPL = 4 | 0x10,
BPL = 5 | 0x10,
SIL = 6 | 0x10,
DIL = 7 | 0x10,
R8B = 8,
R9B = 9,
R10B = 10,
R11B = 11,
R12B = 12,
R13B = 13,
R14B = 14,
R15B = 15,
kNumberOfByteRegisters = 16,
kNoByteRegister = -1 // Signals an illegal register.
};
inline ByteRegister ByteRegisterOf(Register reg) {
if (RSP <= reg && reg <= RDI) {
return static_cast<ByteRegister>(reg | 0x10);
} else {
return static_cast<ByteRegister>(reg);
}
}
enum XmmRegister {
XMM0 = 0,
XMM1 = 1,
XMM2 = 2,
XMM3 = 3,
XMM4 = 4,
XMM5 = 5,
XMM6 = 6,
XMM7 = 7,
XMM8 = 8,
XMM9 = 9,
XMM10 = 10,
XMM11 = 11,
XMM12 = 12,
XMM13 = 13,
XMM14 = 14,
XMM15 = 15,
kNumberOfXmmRegisters = 16,
kNoXmmRegister = -1 // Signals an illegal register.
};
// Architecture independent aliases.
typedef XmmRegister FpuRegister;
const FpuRegister FpuTMP = XMM15;
const int kFpuRegisterSize = 16;
typedef simd128_value_t fpu_register_t;
const int kNumberOfFpuRegisters = kNumberOfXmmRegisters;
const FpuRegister kNoFpuRegister = kNoXmmRegister;
extern const char* const cpu_reg_names[kNumberOfCpuRegisters];
extern const char* const cpu_reg_abi_names[kNumberOfCpuRegisters];
extern const char* const cpu_reg_byte_names[kNumberOfByteRegisters];
extern const char* const fpu_reg_names[kNumberOfXmmRegisters];
enum RexBits {
REX_NONE = 0,
REX_B = 1 << 0,
REX_X = 1 << 1,
REX_R = 1 << 2,
REX_W = 1 << 3,
REX_PREFIX = 1 << 6
};
// Register aliases.
const Register TMP = R11; // Used as scratch register by the assembler.
const Register TMP2 = kNoRegister; // No second assembler scratch register.
// Caches object pool pointer in generated code.
const Register PP = R15;
const Register SPREG = RSP; // Stack pointer register.
const Register FPREG = RBP; // Frame pointer register.
const Register IC_DATA_REG = RBX; // ICData/MegamorphicCache register.
const Register ARGS_DESC_REG = R10; // Arguments descriptor register.
const Register CODE_REG = R12;
// Set when calling Dart functions in JIT mode, used by LazyCompileStub.
const Register FUNCTION_REG = RAX;
const Register THR = R14; // Caches current thread in generated code.
const Register CALLEE_SAVED_TEMP = RBX;
// ABI for catch-clause entry point.
const Register kExceptionObjectReg = RAX;
const Register kStackTraceObjectReg = RDX;
// ABI for write barrier stub.
const Register kWriteBarrierObjectReg = RDX;
const Register kWriteBarrierValueReg = RAX;
const Register kWriteBarrierSlotReg = R13;
// Common ABI for shared slow path stubs.
struct SharedSlowPathStubABI {
static constexpr Register kResultReg = RAX;
};
// ABI for instantiation stubs.
struct InstantiationABI {
static constexpr Register kUninstantiatedTypeArgumentsReg = RBX;
static constexpr Register kInstantiatorTypeArgumentsReg = RDX;
static constexpr Register kFunctionTypeArgumentsReg = RCX;
static constexpr Register kResultTypeArgumentsReg = RAX;
static constexpr Register kResultTypeReg = RAX;
static constexpr Register kScratchReg = R9;
};
// Registers in addition to those listed in InstantiationABI used inside the
// implementation of the InstantiateTypeArguments stubs.
struct InstantiateTAVInternalRegs {
// The set of registers that must be pushed/popped when probing a hash-based
// cache due to overlap with the registers in InstantiationABI.
static constexpr intptr_t kSavedRegisters = 0;
// Additional registers used to probe hash-based caches.
static constexpr Register kEntryStartReg = R10;
static constexpr Register kProbeMaskReg = R13;
static constexpr Register kProbeDistanceReg = R8;
static constexpr Register kCurrentEntryIndexReg = RSI;
};
// Registers in addition to those listed in TypeTestABI used inside the
// implementation of type testing stubs that are _not_ preserved.
struct TTSInternalRegs {
static constexpr Register kInstanceTypeArgumentsReg = RSI;
static constexpr Register kScratchReg = R8;
static constexpr Register kSubTypeArgumentReg = R10;
static constexpr Register kSuperTypeArgumentReg = R13;
// Must be pushed/popped whenever generic type arguments are being checked as
// they overlap with registers in TypeTestABI.
static constexpr intptr_t kSavedTypeArgumentRegisters = 0;
static constexpr intptr_t kInternalRegisters =
((1 << kInstanceTypeArgumentsReg) | (1 << kScratchReg) |
(1 << kSubTypeArgumentReg) | (1 << kSuperTypeArgumentReg)) &
~kSavedTypeArgumentRegisters;
};
// Registers in addition to those listed in TypeTestABI used inside the
// implementation of subtype test cache stubs that are _not_ preserved.
struct STCInternalRegs {
static constexpr Register kCacheEntryReg = RDI;
static constexpr Register kInstanceCidOrSignatureReg = R10;
static constexpr Register kInstanceInstantiatorTypeArgumentsReg = R13;
static constexpr intptr_t kInternalRegisters =
(1 << kCacheEntryReg) | (1 << kInstanceCidOrSignatureReg) |
(1 << kInstanceInstantiatorTypeArgumentsReg);
};
// Calling convention when calling TypeTestingStub and SubtypeTestCacheStub.
struct TypeTestABI {
static constexpr Register kInstanceReg = RAX;
static constexpr Register kDstTypeReg = RBX;
static constexpr Register kInstantiatorTypeArgumentsReg = RDX;
static constexpr Register kFunctionTypeArgumentsReg = RCX;
static constexpr Register kSubtypeTestCacheReg = R9;
static constexpr Register kScratchReg = RSI;
// For calls to InstanceOfStub.
static constexpr Register kInstanceOfResultReg = kInstanceReg;
// For calls to SubtypeNTestCacheStub. Must not overlap with any other
// registers above, for it is also used internally as kNullReg in those stubs.
static constexpr Register kSubtypeTestCacheResultReg = R8;
static constexpr intptr_t kPreservedAbiRegisters =
(1 << kInstanceReg) | (1 << kDstTypeReg) |
(1 << kInstantiatorTypeArgumentsReg) | (1 << kFunctionTypeArgumentsReg);
static constexpr intptr_t kNonPreservedAbiRegisters =
TTSInternalRegs::kInternalRegisters |
STCInternalRegs::kInternalRegisters | (1 << kSubtypeTestCacheReg) |
(1 << kScratchReg) | (1 << kSubtypeTestCacheResultReg) | (1 << CODE_REG);
static constexpr intptr_t kAbiRegisters =
kPreservedAbiRegisters | kNonPreservedAbiRegisters;
};
// Calling convention when calling AssertSubtypeStub.
struct AssertSubtypeABI {
static constexpr Register kSubTypeReg = RAX;
static constexpr Register kSuperTypeReg = RBX;
static constexpr Register kInstantiatorTypeArgumentsReg = RDX;
static constexpr Register kFunctionTypeArgumentsReg = RCX;
static constexpr Register kDstNameReg = R9;
static constexpr intptr_t kAbiRegisters =
(1 << kSubTypeReg) | (1 << kSuperTypeReg) |
(1 << kInstantiatorTypeArgumentsReg) | (1 << kFunctionTypeArgumentsReg) |
(1 << kDstNameReg);
// No result register, as AssertSubtype is only run for side effect
// (throws if the subtype check fails).
};
// ABI for InitStaticFieldStub.
struct InitStaticFieldABI {
static constexpr Register kFieldReg = RDX;
static constexpr Register kResultReg = RAX;
};
// Registers used inside the implementation of InitLateStaticFieldStub.
struct InitLateStaticFieldInternalRegs {
static constexpr Register kAddressReg = RCX;
static constexpr Register kScratchReg = RSI;
};
// ABI for InitInstanceFieldStub.
struct InitInstanceFieldABI {
static constexpr Register kInstanceReg = RBX;
static constexpr Register kFieldReg = RDX;
static constexpr Register kResultReg = RAX;
};
// Registers used inside the implementation of InitLateInstanceFieldStub.
struct InitLateInstanceFieldInternalRegs {
static constexpr Register kAddressReg = RCX;
static constexpr Register kScratchReg = RSI;
};
// ABI for LateInitializationError stubs.
struct LateInitializationErrorABI {
static constexpr Register kFieldReg = RSI;
};
// ABI for ThrowStub.
struct ThrowABI {
static constexpr Register kExceptionReg = RAX;
};
// ABI for ReThrowStub.
struct ReThrowABI {
static constexpr Register kExceptionReg = RAX;
static constexpr Register kStackTraceReg = RBX;
};
// ABI for AssertBooleanStub.
struct AssertBooleanABI {
static constexpr Register kObjectReg = RAX;
};
// ABI for RangeErrorStub.
struct RangeErrorABI {
static constexpr Register kLengthReg = RAX;
static constexpr Register kIndexReg = RBX;
};
// ABI for AllocateObjectStub.
struct AllocateObjectABI {
static constexpr Register kResultReg = RAX;
static constexpr Register kTypeArgumentsReg = RDX;
static constexpr Register kTagsReg = R8;
};
// ABI for AllocateClosureStub.
struct AllocateClosureABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kFunctionReg = RBX;
static constexpr Register kContextReg = RDX;
static constexpr Register kInstantiatorTypeArgsReg = RCX;
static constexpr Register kScratchReg = R13;
};
// ABI for AllocateMintShared*Stub.
struct AllocateMintABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kTempReg = RBX;
};
// ABI for Allocate{Mint,Double,Float32x4,Float64x2}Stub.
struct AllocateBoxABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kTempReg = RBX;
};
// ABI for AllocateArrayStub.
struct AllocateArrayABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kLengthReg = R10;
static constexpr Register kTypeArgumentsReg = RBX;
};
// ABI for AllocateRecordStub.
struct AllocateRecordABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kShapeReg = RBX;
static constexpr Register kTemp1Reg = RDX;
static constexpr Register kTemp2Reg = RCX;
};
// ABI for AllocateSmallRecordStub (AllocateRecord2, AllocateRecord2Named,
// AllocateRecord3, AllocateRecord3Named).
struct AllocateSmallRecordABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kShapeReg = R10;
static constexpr Register kValue0Reg = RBX;
static constexpr Register kValue1Reg = RDX;
static constexpr Register kValue2Reg = RCX;
static constexpr Register kTempReg = RDI;
};
// ABI for AllocateTypedDataArrayStub.
struct AllocateTypedDataArrayABI {
static constexpr Register kResultReg = AllocateObjectABI::kResultReg;
static constexpr Register kLengthReg = kResultReg;
};
// ABI for BoxDoubleStub.
struct BoxDoubleStubABI {
static constexpr FpuRegister kValueReg = XMM0;
static constexpr Register kTempReg = RBX;
static constexpr Register kResultReg = RAX;
};
// ABI for DoubleToIntegerStub.
struct DoubleToIntegerStubABI {
static constexpr FpuRegister kInputReg = XMM0;
static constexpr Register kRecognizedKindReg = RAX;
static constexpr Register kResultReg = RAX;
};
// ABI for SuspendStub (AwaitStub, AwaitWithTypeCheckStub, YieldAsyncStarStub,
// SuspendSyncStarAtStartStub, SuspendSyncStarAtYieldStub).
struct SuspendStubABI {
static constexpr Register kArgumentReg = RAX;
static constexpr Register kTypeArgsReg = RDX; // Can be the same as kTempReg
static constexpr Register kTempReg = RDX;
static constexpr Register kFrameSizeReg = RCX;
static constexpr Register kSuspendStateReg = RBX;
static constexpr Register kFunctionDataReg = R8;
static constexpr Register kSrcFrameReg = RSI;
static constexpr Register kDstFrameReg = RDI;
// Number of bytes to skip after
// suspend stub return address in order to resume.
// X64: mov rsp, rbp; pop rbp; ret
static constexpr intptr_t kResumePcDistance = 5;
};
// ABI for InitSuspendableFunctionStub (InitAsyncStub, InitAsyncStarStub,
// InitSyncStarStub).
struct InitSuspendableFunctionStubABI {
static constexpr Register kTypeArgsReg = RAX;
};
// ABI for ResumeStub
struct ResumeStubABI {
static constexpr Register kSuspendStateReg = RBX;
static constexpr Register kTempReg = RDX;
// Registers for the frame copying (the 1st part).
static constexpr Register kFrameSizeReg = RCX;
static constexpr Register kSrcFrameReg = RSI;
static constexpr Register kDstFrameReg = RDI;
// Registers for control transfer.
// (the 2nd part, can reuse registers from the 1st part)
static constexpr Register kResumePcReg = RCX;
// Can also reuse kSuspendStateReg but should not conflict with CODE_REG/PP.
static constexpr Register kExceptionReg = RSI;
static constexpr Register kStackTraceReg = RDI;
};
// ABI for ReturnStub (ReturnAsyncStub, ReturnAsyncNotFutureStub,
// ReturnAsyncStarStub).
struct ReturnStubABI {
static constexpr Register kSuspendStateReg = RBX;
};
// ABI for AsyncExceptionHandlerStub.
struct AsyncExceptionHandlerStubABI {
static constexpr Register kSuspendStateReg = RBX;
};
// ABI for CloneSuspendStateStub.
struct CloneSuspendStateStubABI {
static constexpr Register kSourceReg = RAX;
static constexpr Register kDestinationReg = RBX;
static constexpr Register kTempReg = RDX;
static constexpr Register kFrameSizeReg = RCX;
static constexpr Register kSrcFrameReg = RSI;
static constexpr Register kDstFrameReg = RDI;
};
// ABI for FfiAsyncCallbackSendStub.
struct FfiAsyncCallbackSendStubABI {
static constexpr Register kArgsReg = RAX;
};
// ABI for DispatchTableNullErrorStub and consequently for all dispatch
// table calls (though normal functions will not expect or use this
// register). This ABI is added to distinguish memory corruption errors from
// null errors.
struct DispatchTableNullErrorABI {
static constexpr Register kClassIdReg = RCX;
};
typedef uint32_t RegList;
const RegList kAllCpuRegistersList = 0xFFFF;
const RegList kAllFpuRegistersList = 0xFFFF;
const RegList kReservedCpuRegisters =
R(SPREG) | R(FPREG) | R(TMP) | R(PP) | R(THR);
constexpr intptr_t kNumberOfReservedCpuRegisters =
Utils::CountOneBits32(kReservedCpuRegisters);
// CPU registers available to Dart allocator.
const RegList kDartAvailableCpuRegs =
kAllCpuRegistersList & ~kReservedCpuRegisters;
constexpr int kNumberOfDartAvailableCpuRegs =
kNumberOfCpuRegisters - kNumberOfReservedCpuRegisters;
// Low numbered registers sometimes require fewer prefixes.
constexpr int kRegisterAllocationBias = 0;
constexpr int kStoreBufferWrapperSize = 13;
#if defined(DART_TARGET_OS_WINDOWS)
const RegList kAbiPreservedCpuRegs =
R(RBX) | R(RSI) | R(RDI) | R(R12) | R(R13) | R(R14) | R(R15);
const RegList kAbiVolatileFpuRegs =
R(XMM0) | R(XMM1) | R(XMM2) | R(XMM3) | R(XMM4) | R(XMM5);
#else
const RegList kAbiPreservedCpuRegs = R(RBX) | R(R12) | R(R13) | R(R14) | R(R15);
const RegList kAbiVolatileFpuRegs = kAllFpuRegistersList;
#endif
// Registers available to Dart that are not preserved by runtime calls.
const RegList kDartVolatileCpuRegs =
kDartAvailableCpuRegs & ~kAbiPreservedCpuRegs;
enum ScaleFactor {
TIMES_1 = 0,
TIMES_2 = 1,
TIMES_4 = 2,
TIMES_8 = 3,
// Note that Intel addressing does not support this addressing.
// > Scale factor — A value of 2, 4, or 8 that is multiplied by the index
// > value.
// https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4
// 3.7.5 Specifying an Offset
TIMES_16 = 4,
// We can't include vm/compiler/runtime_api.h, so just be explicit instead
// of using (dart::)kWordSizeLog2.
#if defined(TARGET_ARCH_IS_64_BIT)
// Used for Smi-boxed indices.
TIMES_HALF_WORD_SIZE = kInt64SizeLog2 - 1,
// Used for unboxed indices.
TIMES_WORD_SIZE = kInt64SizeLog2,
#else
#error "Unexpected word size"
#endif
#if !defined(DART_COMPRESSED_POINTERS)
TIMES_COMPRESSED_WORD_SIZE = TIMES_WORD_SIZE,
#else
TIMES_COMPRESSED_WORD_SIZE = TIMES_HALF_WORD_SIZE,
#endif
// Used for Smi-boxed indices.
TIMES_COMPRESSED_HALF_WORD_SIZE = TIMES_COMPRESSED_WORD_SIZE - 1,
};
class CallingConventions {
public:
#if defined(DART_TARGET_OS_WINDOWS)
static constexpr Register kArg1Reg = RCX;
static constexpr Register kArg2Reg = RDX;
static constexpr Register kArg3Reg = R8;
static constexpr Register kArg4Reg = R9;
static const Register ArgumentRegisters[];
static constexpr intptr_t kArgumentRegisters =
R(kArg1Reg) | R(kArg2Reg) | R(kArg3Reg) | R(kArg4Reg);
static constexpr intptr_t kNumArgRegs = 4;
static constexpr Register kPointerToReturnStructRegisterCall = kArg1Reg;
static const XmmRegister FpuArgumentRegisters[];
static constexpr intptr_t kFpuArgumentRegisters =
R(XMM0) | R(XMM1) | R(XMM2) | R(XMM3);
static constexpr intptr_t kNumFpuArgRegs = 4;
// Whether ArgumentRegisters[i] prevents using XmmArgumentRegisters[i] at the
// same time and vice versa.
static constexpr bool kArgumentIntRegXorFpuReg = true;
// AL not set on vararg calls in Windows.
static constexpr Register kVarArgFpuRegisterCount = kNoRegister;
// > The x64 Application Binary Interface (ABI) uses a four-register
// > fast-call calling convention by default. Space is allocated on the call
// > stack as a shadow store for callees to save those registers.
// https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention?view=msvc-160
//
// The caller allocates this space. The caller should also reclaim this space
// after the call to restore the stack to its original state if needed.
//
// This is also known as home space.
// https://devblogs.microsoft.com/oldnewthing/20160623-00/?p=93735
static constexpr intptr_t kShadowSpaceBytes = 4 * kWordSize;
static constexpr intptr_t kVolatileCpuRegisters =
R(RAX) | R(RCX) | R(RDX) | R(R8) | R(R9) | R(R10) | R(R11);
static constexpr RegList kVolatileXmmRegisters = kAbiVolatileFpuRegs;
static constexpr intptr_t kCalleeSaveXmmRegisters =
R(XMM6) | R(XMM7) | R(XMM8) | R(XMM9) | R(XMM10) | R(XMM11) | R(XMM12) |
R(XMM13) | R(XMM14) | R(XMM15);
static constexpr XmmRegister xmmFirstNonParameterReg = XMM4;
// Windows x64 ABI specifies that small objects are passed in registers.
// Otherwise they are passed by reference.
static const size_t kRegisterTransferLimit = 16;
static constexpr Register kReturnReg = RAX;
static constexpr Register kSecondReturnReg = RDX;
static constexpr FpuRegister kReturnFpuReg = XMM0;
static constexpr Register kPointerToReturnStructRegisterReturn = kReturnReg;
// Whether larger than wordsize arguments are aligned to even registers.
static constexpr AlignmentStrategy kArgumentRegisterAlignment =
kAlignedToWordSize;
static constexpr AlignmentStrategy kArgumentRegisterAlignmentVarArgs =
kArgumentRegisterAlignment;
// How stack arguments are aligned.
static constexpr AlignmentStrategy kArgumentStackAlignment =
kAlignedToWordSize;
static constexpr AlignmentStrategy kArgumentStackAlignmentVarArgs =
kArgumentStackAlignment;
// How fields in compounds are aligned.
static constexpr AlignmentStrategy kFieldAlignment = kAlignedToValueSize;
// Whether 1 or 2 byte-sized arguments or return values are passed extended
// to 4 bytes.
static constexpr ExtensionStrategy kReturnRegisterExtension = kNotExtended;
static constexpr ExtensionStrategy kArgumentRegisterExtension = kNotExtended;
static constexpr ExtensionStrategy kArgumentStackExtension = kNotExtended;
#else
static constexpr Register kArg1Reg = RDI;
static constexpr Register kArg2Reg = RSI;
static constexpr Register kArg3Reg = RDX;
static constexpr Register kArg4Reg = RCX;
static constexpr Register kArg5Reg = R8;
static constexpr Register kArg6Reg = R9;
static const Register ArgumentRegisters[];
static constexpr intptr_t kArgumentRegisters = R(kArg1Reg) | R(kArg2Reg) |
R(kArg3Reg) | R(kArg4Reg) |
R(kArg5Reg) | R(kArg6Reg);
static constexpr intptr_t kNumArgRegs = 6;
static constexpr Register kPointerToReturnStructRegisterCall = kArg1Reg;
static const XmmRegister FpuArgumentRegisters[];
static constexpr intptr_t kFpuArgumentRegisters =
R(XMM0) | R(XMM1) | R(XMM2) | R(XMM3) | R(XMM4) | R(XMM5) | R(XMM6) |
R(XMM7);
static constexpr intptr_t kNumFpuArgRegs = 8;
// Whether ArgumentRegisters[i] prevents using XmmArgumentRegisters[i] at the
// same time and vice versa.
static constexpr bool kArgumentIntRegXorFpuReg = false;
// > For calls that may call functions that use varargs or stdargs
// > (prototype-less calls or calls to functions containing ellipsis (...) in
// > the declaration) %al16 is used as hidden argument to specify the number
// > of vector registers used. The contents of %al do not need to match
// > exactly the number of registers, but must be an upper bound on the number
// > of vector registers used and is in the range 0–8 inclusive.
// System V ABI spec.
static constexpr Register kVarArgFpuRegisterCount = RAX;
static constexpr intptr_t kShadowSpaceBytes = 0;
static constexpr intptr_t kVolatileCpuRegisters = R(RAX) | R(RCX) | R(RDX) |
R(RSI) | R(RDI) | R(R8) |
R(R9) | R(R10) | R(R11);
static constexpr RegList kVolatileXmmRegisters = kAbiVolatileFpuRegs;
static constexpr intptr_t kCalleeSaveXmmRegisters = 0;
static constexpr XmmRegister xmmFirstNonParameterReg = XMM8;
static constexpr Register kReturnReg = RAX;
static constexpr Register kSecondReturnReg = RDX;
static constexpr FpuRegister kReturnFpuReg = XMM0;
static constexpr FpuRegister kSecondReturnFpuReg = XMM1;
static constexpr Register kPointerToReturnStructRegisterReturn = kReturnReg;
// Whether larger than wordsize arguments are aligned to even registers.
static constexpr AlignmentStrategy kArgumentRegisterAlignment =
kAlignedToWordSize;
static constexpr AlignmentStrategy kArgumentRegisterAlignmentVarArgs =
kArgumentRegisterAlignment;
// How stack arguments are aligned.
static constexpr AlignmentStrategy kArgumentStackAlignment =
kAlignedToWordSize;
static constexpr AlignmentStrategy kArgumentStackAlignmentVarArgs =
kArgumentStackAlignment;
// How fields in compounds are aligned.
static constexpr AlignmentStrategy kFieldAlignment = kAlignedToValueSize;
// Whether 1 or 2 byte-sized arguments or return values are passed extended
// to 4 bytes.
// Note that `kReturnRegisterExtension != kArgumentRegisterExtension`, which
// effectively means that the caller is responsable for truncating and
// extending both arguments and return value.
static constexpr ExtensionStrategy kReturnRegisterExtension = kNotExtended;
static constexpr ExtensionStrategy kArgumentRegisterExtension = kExtendedTo4;
static constexpr ExtensionStrategy kArgumentStackExtension = kExtendedTo4;
#endif
static constexpr intptr_t kCalleeSaveCpuRegisters = kAbiPreservedCpuRegs;
COMPILE_ASSERT((kArgumentRegisters & kReservedCpuRegisters) == 0);
static constexpr Register kFfiAnyNonAbiRegister = R12;
static constexpr Register kFirstNonArgumentRegister = RAX;
static constexpr Register kSecondNonArgumentRegister = RBX;
static constexpr Register kStackPointerRegister = SPREG;
COMPILE_ASSERT(((R(kFfiAnyNonAbiRegister)) & kCalleeSaveCpuRegisters) != 0);
COMPILE_ASSERT(
((R(kFirstNonArgumentRegister) | R(kSecondNonArgumentRegister)) &
(kArgumentRegisters | R(kPointerToReturnStructRegisterCall))) == 0);
};
// Register based calling convention used for Dart functions.
//
// See |compiler::ComputeCallingConvention| for more details.
struct DartCallingConvention {
static constexpr Register kCpuRegistersForArgs[] = {RDI, RSI, RDX,
RBX, R8, R9};
static constexpr FpuRegister kFpuRegistersForArgs[] = {XMM1, XMM2, XMM3,
XMM4, XMM5, XMM6};
};
#undef R
class Instr {
public:
static constexpr uint8_t kHltInstruction = 0xF4;
// We prefer not to use the int3 instruction since it conflicts with gdb.
static constexpr uint8_t kBreakPointInstruction = kHltInstruction;
static constexpr int kBreakPointInstructionSize = 1;
static constexpr uint8_t kGdbBreakpointInstruction = 0xcc;
bool IsBreakPoint() {
ASSERT(kBreakPointInstructionSize == 1);
return (*reinterpret_cast<const uint8_t*>(this)) == kBreakPointInstruction;
}
// Instructions are read out of a code stream. The only way to get a
// reference to an instruction is to convert a pointer. There is no way
// to allocate or create instances of class Instr.
// Use the At(pc) function to create references to Instr.
static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
private:
DISALLOW_ALLOCATION();
// We need to prevent the creation of instances of class Instr.
DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
};
// The largest multibyte nop we will emit. This could go up to 15 if it
// becomes important to us.
const int MAX_NOP_SIZE = 8;
const uint64_t kBreakInstructionFiller = 0xCCCCCCCCCCCCCCCCL;
// Based on presentation "Causes of Performance Instability due to Code
// Placement in X86 - Zia Ansari, Intel"[1].
//
// [1]: https://www.youtube.com/watch?v=IX16gcX4vDQ
const intptr_t kPreferredLoopAlignment = 32;
} // namespace dart
#endif // RUNTIME_VM_CONSTANTS_X64_H_