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/*
* Copyright (C) 2008-2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "AbortReason.h"
#include "AssemblerBuffer.h"
#include "AssemblerCommon.h"
#include "CPU.h"
#include "CodeLocation.h"
#include "JSCJSValue.h"
#include "MacroAssemblerCodeRef.h"
#include "MacroAssemblerHelpers.h"
#include "Options.h"
#include "PtrTag.h"
#include <wtf/CryptographicallyRandomNumber.h>
#include <wtf/Noncopyable.h>
#include <wtf/SharedTask.h>
#include <wtf/Vector.h>
#include <wtf/WeakRandom.h>
namespace JSC {
#if ENABLE(ASSEMBLER)
class AllowMacroScratchRegisterUsage;
class DisallowMacroScratchRegisterUsage;
class LinkBuffer;
class Watchpoint;
namespace DFG {
struct OSRExit;
}
class AbstractMacroAssemblerBase {
public:
enum StatusCondition {
Success,
Failure
};
static StatusCondition invert(StatusCondition condition)
{
switch (condition) {
case Success:
return Failure;
case Failure:
return Success;
}
RELEASE_ASSERT_NOT_REACHED();
return Success;
}
};
template <class AssemblerType>
class AbstractMacroAssembler : public AbstractMacroAssemblerBase {
public:
typedef AbstractMacroAssembler<AssemblerType> AbstractMacroAssemblerType;
typedef AssemblerType AssemblerType_T;
template<PtrTag tag> using CodePtr = MacroAssemblerCodePtr<tag>;
template<PtrTag tag> using CodeRef = MacroAssemblerCodeRef<tag>;
class Jump;
typedef typename AssemblerType::RegisterID RegisterID;
typedef typename AssemblerType::SPRegisterID SPRegisterID;
typedef typename AssemblerType::FPRegisterID FPRegisterID;
static constexpr RegisterID firstRegister() { return AssemblerType::firstRegister(); }
static constexpr RegisterID lastRegister() { return AssemblerType::lastRegister(); }
static constexpr unsigned numberOfRegisters() { return AssemblerType::numberOfRegisters(); }
static const char* gprName(RegisterID id) { return AssemblerType::gprName(id); }
static constexpr SPRegisterID firstSPRegister() { return AssemblerType::firstSPRegister(); }
static constexpr SPRegisterID lastSPRegister() { return AssemblerType::lastSPRegister(); }
static constexpr unsigned numberOfSPRegisters() { return AssemblerType::numberOfSPRegisters(); }
static const char* sprName(SPRegisterID id) { return AssemblerType::sprName(id); }
static constexpr FPRegisterID firstFPRegister() { return AssemblerType::firstFPRegister(); }
static constexpr FPRegisterID lastFPRegister() { return AssemblerType::lastFPRegister(); }
static constexpr unsigned numberOfFPRegisters() { return AssemblerType::numberOfFPRegisters(); }
static const char* fprName(FPRegisterID id) { return AssemblerType::fprName(id); }
// Section 1: MacroAssembler operand types
//
// The following types are used as operands to MacroAssembler operations,
// describing immediate and memory operands to the instructions to be planted.
enum Scale {
TimesOne,
TimesTwo,
TimesFour,
TimesEight,
};
static Scale timesPtr()
{
if (sizeof(void*) == 4)
return TimesFour;
return TimesEight;
}
struct BaseIndex;
static RegisterID withSwappedRegister(RegisterID original, RegisterID left, RegisterID right)
{
if (original == left)
return right;
if (original == right)
return left;
return original;
}
// Address:
//
// Describes a simple base-offset address.
struct Address {
explicit Address(RegisterID base, int32_t offset = 0)
: base(base)
, offset(offset)
{
}
Address withOffset(int32_t additionalOffset)
{
return Address(base, offset + additionalOffset);
}
Address withSwappedRegister(RegisterID left, RegisterID right)
{
return Address(AbstractMacroAssembler::withSwappedRegister(base, left, right), offset);
}
BaseIndex indexedBy(RegisterID index, Scale) const;
RegisterID base;
int32_t offset;
};
struct ExtendedAddress {
explicit ExtendedAddress(RegisterID base, intptr_t offset = 0)
: base(base)
, offset(offset)
{
}
RegisterID base;
intptr_t offset;
};
// ImplicitAddress:
//
// This class is used for explicit 'load' and 'store' operations
// (as opposed to situations in which a memory operand is provided
// to a generic operation, such as an integer arithmetic instruction).
//
// In the case of a load (or store) operation we want to permit
// addresses to be implicitly constructed, e.g. the two calls:
//
// load32(Address(addrReg), destReg);
// load32(addrReg, destReg);
//
// Are equivalent, and the explicit wrapping of the Address in the former
// is unnecessary.
struct ImplicitAddress {
ImplicitAddress(RegisterID base)
: base(base)
, offset(0)
{
}
ImplicitAddress(Address address)
: base(address.base)
, offset(address.offset)
{
}
RegisterID base;
int32_t offset;
};
// BaseIndex:
//
// Describes a complex addressing mode.
struct BaseIndex {
BaseIndex(RegisterID base, RegisterID index, Scale scale, int32_t offset = 0)
: base(base)
, index(index)
, scale(scale)
, offset(offset)
{
}
RegisterID base;
RegisterID index;
Scale scale;
int32_t offset;
BaseIndex withOffset(int32_t additionalOffset)
{
return BaseIndex(base, index, scale, offset + additionalOffset);
}
BaseIndex withSwappedRegister(RegisterID left, RegisterID right)
{
return BaseIndex(AbstractMacroAssembler::withSwappedRegister(base, left, right), AbstractMacroAssembler::withSwappedRegister(index, left, right), scale, offset);
}
};
// AbsoluteAddress:
//
// Describes an memory operand given by a pointer. For regular load & store
// operations an unwrapped void* will be used, rather than using this.
struct AbsoluteAddress {
explicit AbsoluteAddress(const void* ptr)
: m_ptr(ptr)
{
}
const void* m_ptr;
};
// TrustedImm:
//
// An empty super class of each of the TrustedImm types. This class is used for template overloads
// on a TrustedImm type via std::is_base_of.
struct TrustedImm { };
// TrustedImmPtr:
//
// A pointer sized immediate operand to an instruction - this is wrapped
// in a class requiring explicit construction in order to differentiate
// from pointers used as absolute addresses to memory operations
struct TrustedImmPtr : public TrustedImm {
TrustedImmPtr() { }
explicit TrustedImmPtr(const void* value)
: m_value(value)
{
}
template<typename ReturnType, typename... Arguments>
explicit TrustedImmPtr(ReturnType(*value)(Arguments...))
: m_value(reinterpret_cast<void*>(value))
{
}
explicit TrustedImmPtr(std::nullptr_t)
{
}
explicit TrustedImmPtr(size_t value)
: m_value(reinterpret_cast<void*>(value))
{
}
intptr_t asIntptr()
{
return reinterpret_cast<intptr_t>(m_value);
}
void* asPtr()
{
return const_cast<void*>(m_value);
}
const void* m_value { 0 };
};
struct ImmPtr : private TrustedImmPtr
{
explicit ImmPtr(const void* value)
: TrustedImmPtr(value)
{
}
TrustedImmPtr asTrustedImmPtr() { return *this; }
};
// TrustedImm32:
//
// A 32bit immediate operand to an instruction - this is wrapped in a
// class requiring explicit construction in order to prevent RegisterIDs
// (which are implemented as an enum) from accidentally being passed as
// immediate values.
struct TrustedImm32 : public TrustedImm {
TrustedImm32() { }
explicit TrustedImm32(int32_t value)
: m_value(value)
{
}
#if !CPU(X86_64)
explicit TrustedImm32(TrustedImmPtr ptr)
: m_value(ptr.asIntptr())
{
}
#endif
int32_t m_value;
};
struct Imm32 : private TrustedImm32 {
explicit Imm32(int32_t value)
: TrustedImm32(value)
{
}
#if !CPU(X86_64)
explicit Imm32(TrustedImmPtr ptr)
: TrustedImm32(ptr)
{
}
#endif
const TrustedImm32& asTrustedImm32() const { return *this; }
};
// TrustedImm64:
//
// A 64bit immediate operand to an instruction - this is wrapped in a
// class requiring explicit construction in order to prevent RegisterIDs
// (which are implemented as an enum) from accidentally being passed as
// immediate values.
struct TrustedImm64 : TrustedImm {
TrustedImm64() { }
explicit TrustedImm64(int64_t value)
: m_value(value)
{
}
#if CPU(X86_64) || CPU(ARM64)
explicit TrustedImm64(TrustedImmPtr ptr)
: m_value(ptr.asIntptr())
{
}
#endif
int64_t m_value;
};
struct Imm64 : private TrustedImm64
{
explicit Imm64(int64_t value)
: TrustedImm64(value)
{
}
#if CPU(X86_64) || CPU(ARM64)
explicit Imm64(TrustedImmPtr ptr)
: TrustedImm64(ptr)
{
}
#endif
const TrustedImm64& asTrustedImm64() const { return *this; }
};
// Section 2: MacroAssembler code buffer handles
//
// The following types are used to reference items in the code buffer
// during JIT code generation. For example, the type Jump is used to
// track the location of a jump instruction so that it may later be
// linked to a label marking its destination.
// Label:
//
// A Label records a point in the generated instruction stream, typically such that
// it may be used as a destination for a jump.
class Label {
friend class AbstractMacroAssembler<AssemblerType>;
friend struct DFG::OSRExit;
friend class Jump;
template<PtrTag> friend class MacroAssemblerCodeRef;
friend class LinkBuffer;
friend class Watchpoint;
public:
Label()
{
}
Label(AbstractMacroAssemblerType* masm)
: m_label(masm->m_assembler.label())
{
masm->invalidateAllTempRegisters();
}
bool operator==(const Label& other) const { return m_label == other.m_label; }
bool isSet() const { return m_label.isSet(); }
private:
AssemblerLabel m_label;
};
// ConvertibleLoadLabel:
//
// A ConvertibleLoadLabel records a loadPtr instruction that can be patched to an addPtr
// so that:
//
// loadPtr(Address(a, i), b)
//
// becomes:
//
// addPtr(TrustedImmPtr(i), a, b)
class ConvertibleLoadLabel {
friend class AbstractMacroAssembler<AssemblerType>;
friend class LinkBuffer;
public:
ConvertibleLoadLabel()
{
}
ConvertibleLoadLabel(AbstractMacroAssemblerType* masm)
: m_label(masm->m_assembler.labelIgnoringWatchpoints())
{
}
bool isSet() const { return m_label.isSet(); }
private:
AssemblerLabel m_label;
};
// DataLabelPtr:
//
// A DataLabelPtr is used to refer to a location in the code containing a pointer to be
// patched after the code has been generated.
class DataLabelPtr {
friend class AbstractMacroAssembler<AssemblerType>;
friend class LinkBuffer;
public:
DataLabelPtr()
{
}
DataLabelPtr(AbstractMacroAssemblerType* masm)
: m_label(masm->m_assembler.label())
{
}
bool isSet() const { return m_label.isSet(); }
private:
AssemblerLabel m_label;
};
// DataLabel32:
//
// A DataLabel32 is used to refer to a location in the code containing a 32-bit constant to be
// patched after the code has been generated.
class DataLabel32 {
friend class AbstractMacroAssembler<AssemblerType>;
friend class LinkBuffer;
public:
DataLabel32()
{
}
DataLabel32(AbstractMacroAssemblerType* masm)
: m_label(masm->m_assembler.label())
{
}
AssemblerLabel label() const { return m_label; }
private:
AssemblerLabel m_label;
};
// DataLabelCompact:
//
// A DataLabelCompact is used to refer to a location in the code containing a
// compact immediate to be patched after the code has been generated.
class DataLabelCompact {
friend class AbstractMacroAssembler<AssemblerType>;
friend class LinkBuffer;
public:
DataLabelCompact()
{
}
DataLabelCompact(AbstractMacroAssemblerType* masm)
: m_label(masm->m_assembler.label())
{
}
DataLabelCompact(AssemblerLabel label)
: m_label(label)
{
}
AssemblerLabel label() const { return m_label; }
private:
AssemblerLabel m_label;
};
// Call:
//
// A Call object is a reference to a call instruction that has been planted
// into the code buffer - it is typically used to link the call, setting the
// relative offset such that when executed it will call to the desired
// destination.
class Call {
friend class AbstractMacroAssembler<AssemblerType>;
public:
enum Flags {
None = 0x0,
Linkable = 0x1,
Near = 0x2,
Tail = 0x4,
LinkableNear = 0x3,
LinkableNearTail = 0x7,
};
Call()
: m_flags(None)
{
}
Call(AssemblerLabel jmp, Flags flags)
: m_label(jmp)
, m_flags(flags)
{
}
bool isFlagSet(Flags flag)
{
return m_flags & flag;
}
static Call fromTailJump(Jump jump)
{
return Call(jump.m_label, Linkable);
}
AssemblerLabel m_label;
private:
Flags m_flags;
};
// Jump:
//
// A jump object is a reference to a jump instruction that has been planted
// into the code buffer - it is typically used to link the jump, setting the
// relative offset such that when executed it will jump to the desired
// destination.
class Jump {
friend class AbstractMacroAssembler<AssemblerType>;
friend class Call;
friend struct DFG::OSRExit;
friend class LinkBuffer;
public:
Jump()
{
}
#if CPU(ARM_THUMB2)
// Fixme: this information should be stored in the instruction stream, not in the Jump object.
Jump(AssemblerLabel jmp, ARMv7Assembler::JumpType type = ARMv7Assembler::JumpNoCondition, ARMv7Assembler::Condition condition = ARMv7Assembler::ConditionInvalid)
: m_label(jmp)
, m_type(type)
, m_condition(condition)
{
}
#elif CPU(ARM64)
Jump(AssemblerLabel jmp, ARM64Assembler::JumpType type = ARM64Assembler::JumpNoCondition, ARM64Assembler::Condition condition = ARM64Assembler::ConditionInvalid)
: m_label(jmp)
, m_type(type)
, m_condition(condition)
{
}
Jump(AssemblerLabel jmp, ARM64Assembler::JumpType type, ARM64Assembler::Condition condition, bool is64Bit, ARM64Assembler::RegisterID compareRegister)
: m_label(jmp)
, m_type(type)
, m_condition(condition)
, m_is64Bit(is64Bit)
, m_compareRegister(compareRegister)
{
ASSERT((type == ARM64Assembler::JumpCompareAndBranch) || (type == ARM64Assembler::JumpCompareAndBranchFixedSize));
}
Jump(AssemblerLabel jmp, ARM64Assembler::JumpType type, ARM64Assembler::Condition condition, unsigned bitNumber, ARM64Assembler::RegisterID compareRegister)
: m_label(jmp)
, m_type(type)
, m_condition(condition)
, m_bitNumber(bitNumber)
, m_compareRegister(compareRegister)
{
ASSERT((type == ARM64Assembler::JumpTestBit) || (type == ARM64Assembler::JumpTestBitFixedSize));
}
#else
Jump(AssemblerLabel jmp)
: m_label(jmp)
{
}
#endif
Label label() const
{
Label result;
result.m_label = m_label;
return result;
}
void link(AbstractMacroAssemblerType* masm) const
{
masm->invalidateAllTempRegisters();
#if ENABLE(DFG_REGISTER_ALLOCATION_VALIDATION)
masm->checkRegisterAllocationAgainstBranchRange(m_label.m_offset, masm->debugOffset());
#endif
#if CPU(ARM_THUMB2)
masm->m_assembler.linkJump(m_label, masm->m_assembler.label(), m_type, m_condition);
#elif CPU(ARM64)
if ((m_type == ARM64Assembler::JumpCompareAndBranch) || (m_type == ARM64Assembler::JumpCompareAndBranchFixedSize))
masm->m_assembler.linkJump(m_label, masm->m_assembler.label(), m_type, m_condition, m_is64Bit, m_compareRegister);
else if ((m_type == ARM64Assembler::JumpTestBit) || (m_type == ARM64Assembler::JumpTestBitFixedSize))
masm->m_assembler.linkJump(m_label, masm->m_assembler.label(), m_type, m_condition, m_bitNumber, m_compareRegister);
else
masm->m_assembler.linkJump(m_label, masm->m_assembler.label(), m_type, m_condition);
#else
masm->m_assembler.linkJump(m_label, masm->m_assembler.label());
#endif
}
void linkTo(Label label, AbstractMacroAssemblerType* masm) const
{
#if ENABLE(DFG_REGISTER_ALLOCATION_VALIDATION)
masm->checkRegisterAllocationAgainstBranchRange(label.m_label.m_offset, m_label.m_offset);
#endif
#if CPU(ARM_THUMB2)
masm->m_assembler.linkJump(m_label, label.m_label, m_type, m_condition);
#elif CPU(ARM64)
if ((m_type == ARM64Assembler::JumpCompareAndBranch) || (m_type == ARM64Assembler::JumpCompareAndBranchFixedSize))
masm->m_assembler.linkJump(m_label, label.m_label, m_type, m_condition, m_is64Bit, m_compareRegister);
else if ((m_type == ARM64Assembler::JumpTestBit) || (m_type == ARM64Assembler::JumpTestBitFixedSize))
masm->m_assembler.linkJump(m_label, label.m_label, m_type, m_condition, m_bitNumber, m_compareRegister);
else
masm->m_assembler.linkJump(m_label, label.m_label, m_type, m_condition);
#else
masm->m_assembler.linkJump(m_label, label.m_label);
#endif
}
bool isSet() const { return m_label.isSet(); }
private:
AssemblerLabel m_label;
#if CPU(ARM_THUMB2)
ARMv7Assembler::JumpType m_type;
ARMv7Assembler::Condition m_condition;
#elif CPU(ARM64)
ARM64Assembler::JumpType m_type;
ARM64Assembler::Condition m_condition;
bool m_is64Bit;
unsigned m_bitNumber;
ARM64Assembler::RegisterID m_compareRegister;
#endif
};
struct PatchableJump {
PatchableJump()
{
}
explicit PatchableJump(Jump jump)
: m_jump(jump)
{
}
operator Jump&() { return m_jump; }
Jump m_jump;
};
// JumpList:
//
// A JumpList is a set of Jump objects.
// All jumps in the set will be linked to the same destination.
class JumpList {
public:
typedef Vector<Jump, 2> JumpVector;
JumpList() { }
JumpList(Jump jump)
{
if (jump.isSet())
append(jump);
}
void link(AbstractMacroAssemblerType* masm) const
{
size_t size = m_jumps.size();
for (size_t i = 0; i < size; ++i)
m_jumps[i].link(masm);
}
void linkTo(Label label, AbstractMacroAssemblerType* masm) const
{
size_t size = m_jumps.size();
for (size_t i = 0; i < size; ++i)
m_jumps[i].linkTo(label, masm);
}
void append(Jump jump)
{
if (jump.isSet())
m_jumps.append(jump);
}
void append(const JumpList& other)
{
m_jumps.append(other.m_jumps.begin(), other.m_jumps.size());
}
bool empty()
{
return !m_jumps.size();
}
void clear()
{
m_jumps.clear();
}
const JumpVector& jumps() const { return m_jumps; }
private:
JumpVector m_jumps;
};
// Section 3: Misc admin methods
#if ENABLE(DFG_JIT)
Label labelIgnoringWatchpoints()
{
Label result;
result.m_label = m_assembler.labelIgnoringWatchpoints();
return result;
}
#else
Label labelIgnoringWatchpoints()
{
return label();
}
#endif
Label label()
{
return Label(this);
}
void padBeforePatch()
{
// Rely on the fact that asking for a label already does the padding.
(void)label();
}
Label watchpointLabel()
{
Label result;
result.m_label = m_assembler.labelForWatchpoint();
return result;
}
Label align()
{
m_assembler.align(16);
return Label(this);
}
#if ENABLE(DFG_REGISTER_ALLOCATION_VALIDATION)
class RegisterAllocationOffset {
public:
RegisterAllocationOffset(unsigned offset)
: m_offset(offset)
{
}
void checkOffsets(unsigned low, unsigned high)
{
RELEASE_ASSERT_WITH_MESSAGE(!(low <= m_offset && m_offset <= high), "Unsafe branch over register allocation at instruction offset %u in jump offset range %u..%u", m_offset, low, high);
}
private:
unsigned m_offset;
};
void addRegisterAllocationAtOffset(unsigned offset)
{
m_registerAllocationForOffsets.append(RegisterAllocationOffset(offset));
}
void clearRegisterAllocationOffsets()
{
m_registerAllocationForOffsets.clear();
}
void checkRegisterAllocationAgainstBranchRange(unsigned offset1, unsigned offset2)
{
if (offset1 > offset2)
std::swap(offset1, offset2);
size_t size = m_registerAllocationForOffsets.size();
for (size_t i = 0; i < size; ++i)
m_registerAllocationForOffsets[i].checkOffsets(offset1, offset2);
}
#endif
template<typename T, typename U>
static ptrdiff_t differenceBetween(T from, U to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
}
template<PtrTag aTag, PtrTag bTag>
static ptrdiff_t differenceBetweenCodePtr(const MacroAssemblerCodePtr<aTag>& a, const MacroAssemblerCodePtr<bTag>& b)
{
return b.template dataLocation<ptrdiff_t>() - a.template dataLocation<ptrdiff_t>();
}
unsigned debugOffset() { return m_assembler.debugOffset(); }
ALWAYS_INLINE static void cacheFlush(void* code, size_t size)
{
AssemblerType::cacheFlush(code, size);
}
AssemblerType m_assembler;
template<PtrTag tag>
static void linkJump(void* code, Jump jump, CodeLocationLabel<tag> target)
{
AssemblerType::linkJump(code, jump.m_label, target.dataLocation());
}
static void linkPointer(void* code, AssemblerLabel label, void* value)
{
AssemblerType::linkPointer(code, label, value);
}
template<PtrTag tag>
static void linkPointer(void* code, AssemblerLabel label, MacroAssemblerCodePtr<tag> value)
{
AssemblerType::linkPointer(code, label, value.executableAddress());
}
template<PtrTag tag>
static void* getLinkerAddress(void* code, AssemblerLabel label)
{
return tagCodePtr(AssemblerType::getRelocatedAddress(code, label), tag);
}
static unsigned getLinkerCallReturnOffset(Call call)
{
return AssemblerType::getCallReturnOffset(call.m_label);
}
template<PtrTag jumpTag, PtrTag destTag>
static void repatchJump(CodeLocationJump<jumpTag> jump, CodeLocationLabel<destTag> destination)
{
AssemblerType::relinkJump(jump.dataLocation(), destination.dataLocation());
}
template<PtrTag jumpTag>
static void repatchJumpToNop(CodeLocationJump<jumpTag> jump)
{
AssemblerType::relinkJumpToNop(jump.dataLocation());
}
template<PtrTag callTag, PtrTag destTag>
static void repatchNearCall(CodeLocationNearCall<callTag> nearCall, CodeLocationLabel<destTag> destination)
{
switch (nearCall.callMode()) {
case NearCallMode::Tail:
AssemblerType::relinkJump(nearCall.dataLocation(), destination.dataLocation());
return;
case NearCallMode::Regular:
AssemblerType::relinkCall(nearCall.dataLocation(), destination.untaggedExecutableAddress());
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
template<PtrTag tag>
static void repatchCompact(CodeLocationDataLabelCompact<tag> dataLabelCompact, int32_t value)
{
AssemblerType::repatchCompact(dataLabelCompact.template dataLocation(), value);
}
template<PtrTag tag>
static void repatchInt32(CodeLocationDataLabel32<tag> dataLabel32, int32_t value)
{
AssemblerType::repatchInt32(dataLabel32.dataLocation(), value);
}
template<PtrTag tag>
static void repatchPointer(CodeLocationDataLabelPtr<tag> dataLabelPtr, void* value)
{
AssemblerType::repatchPointer(dataLabelPtr.dataLocation(), value);
}
template<PtrTag tag>
static void* readPointer(CodeLocationDataLabelPtr<tag> dataLabelPtr)
{
return AssemblerType::readPointer(dataLabelPtr.dataLocation());
}
template<PtrTag tag>
static void replaceWithLoad(CodeLocationConvertibleLoad<tag> label)
{
AssemblerType::replaceWithLoad(label.dataLocation());
}
template<PtrTag tag>
static void replaceWithAddressComputation(CodeLocationConvertibleLoad<tag> label)
{
AssemblerType::replaceWithAddressComputation(label.dataLocation());
}
template<typename Functor>
void addLinkTask(const Functor& functor)
{
m_linkTasks.append(createSharedTask<void(LinkBuffer&)>(functor));
}
void emitNops(size_t memoryToFillWithNopsInBytes)
{
AssemblerBuffer& buffer = m_assembler.buffer();
size_t startCodeSize = buffer.codeSize();
size_t targetCodeSize = startCodeSize + memoryToFillWithNopsInBytes;
buffer.ensureSpace(memoryToFillWithNopsInBytes);
bool isCopyingToExecutableMemory = false;
AssemblerType::fillNops(static_cast<char*>(buffer.data()) + startCodeSize, memoryToFillWithNopsInBytes, isCopyingToExecutableMemory);
buffer.setCodeSize(targetCodeSize);
}
ALWAYS_INLINE void tagReturnAddress() { }
ALWAYS_INLINE void untagReturnAddress() { }
ALWAYS_INLINE void tagPtr(RegisterID, PtrTag) { }
ALWAYS_INLINE void tagPtr(RegisterID, RegisterID) { }
ALWAYS_INLINE void untagPtr(RegisterID, PtrTag) { }
ALWAYS_INLINE void untagPtr(RegisterID, RegisterID) { }
ALWAYS_INLINE void removePtrTag(RegisterID) { }
protected:
AbstractMacroAssembler()
: m_randomSource(0)
{
invalidateAllTempRegisters();
}
uint32_t random()
{
if (!m_randomSourceIsInitialized) {
m_randomSourceIsInitialized = true;
m_randomSource.setSeed(cryptographicallyRandomNumber());
}
return m_randomSource.getUint32();
}
bool m_randomSourceIsInitialized { false };
WeakRandom m_randomSource;
#if ENABLE(DFG_REGISTER_ALLOCATION_VALIDATION)
Vector<RegisterAllocationOffset, 10> m_registerAllocationForOffsets;
#endif
static bool haveScratchRegisterForBlinding()
{
return false;
}
static RegisterID scratchRegisterForBlinding()
{
UNREACHABLE_FOR_PLATFORM();
return firstRegister();
}
static bool canBlind() { return false; }
static bool shouldBlindForSpecificArch(uint32_t) { return false; }
static bool shouldBlindForSpecificArch(uint64_t) { return false; }
class CachedTempRegister {
friend class DataLabelPtr;
friend class DataLabel32;
friend class DataLabelCompact;
friend class Jump;
friend class Label;
public:
CachedTempRegister(AbstractMacroAssemblerType* masm, RegisterID registerID)
: m_masm(masm)
, m_registerID(registerID)
, m_value(0)
, m_validBit(1 << static_cast<unsigned>(registerID))
{
ASSERT(static_cast<unsigned>(registerID) < (sizeof(unsigned) * 8));
}
ALWAYS_INLINE RegisterID registerIDInvalidate() { invalidate(); return m_registerID; }
ALWAYS_INLINE RegisterID registerIDNoInvalidate() { return m_registerID; }
bool value(intptr_t& value)
{
value = m_value;
return m_masm->isTempRegisterValid(m_validBit);
}
void setValue(intptr_t value)
{
m_value = value;
m_masm->setTempRegisterValid(m_validBit);
}
ALWAYS_INLINE void invalidate() { m_masm->clearTempRegisterValid(m_validBit); }
private:
AbstractMacroAssemblerType* m_masm;
RegisterID m_registerID;
intptr_t m_value;
unsigned m_validBit;
};
ALWAYS_INLINE void invalidateAllTempRegisters()
{
m_tempRegistersValidBits = 0;
}
ALWAYS_INLINE bool isTempRegisterValid(unsigned registerMask)
{
return (m_tempRegistersValidBits & registerMask);
}
ALWAYS_INLINE void clearTempRegisterValid(unsigned registerMask)
{
m_tempRegistersValidBits &= ~registerMask;
}
ALWAYS_INLINE void setTempRegisterValid(unsigned registerMask)
{
m_tempRegistersValidBits |= registerMask;
}
friend class AllowMacroScratchRegisterUsage;
friend class AllowMacroScratchRegisterUsageIf;
friend class DisallowMacroScratchRegisterUsage;
unsigned m_tempRegistersValidBits;
bool m_allowScratchRegister { true };
Vector<RefPtr<SharedTask<void(LinkBuffer&)>>> m_linkTasks;
friend class LinkBuffer;
}; // class AbstractMacroAssembler
template <class AssemblerType>
inline typename AbstractMacroAssembler<AssemblerType>::BaseIndex
AbstractMacroAssembler<AssemblerType>::Address::indexedBy(
typename AbstractMacroAssembler<AssemblerType>::RegisterID index,
typename AbstractMacroAssembler<AssemblerType>::Scale scale) const
{
return BaseIndex(base, index, scale, offset);
}
#endif // ENABLE(ASSEMBLER)
} // namespace JSC
#if ENABLE(ASSEMBLER)
namespace WTF {
class PrintStream;
void printInternal(PrintStream& out, JSC::AbstractMacroAssemblerBase::StatusCondition);
} // namespace WTF
#endif // ENABLE(ASSEMBLER)