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/*
* Copyright (C) 2008 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.
*/
#ifndef AbstractMacroAssembler_h
#define AbstractMacroAssembler_h
#include <wtf/Platform.h>
#if ENABLE(ASSEMBLER)
namespace JSC {
template <class AssemblerType>
class AbstractMacroAssembler {
public:
class Jump;
class PatchBuffer;
class CodeLocationLabel;
class CodeLocationJump;
class CodeLocationCall;
class CodeLocationDataLabel32;
class CodeLocationDataLabelPtr;
typedef typename AssemblerType::RegisterID RegisterID;
typedef typename AssemblerType::JmpSrc JmpSrc;
typedef typename AssemblerType::JmpDst JmpDst;
// 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,
};
// Address:
//
// Describes a simple base-offset address.
struct Address {
explicit Address(RegisterID base, int32_t offset = 0)
: base(base)
, offset(offset)
{
}
RegisterID base;
int32_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;
};
// 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(void* ptr)
: m_ptr(ptr)
{
}
void* m_ptr;
};
// ImmPtr:
//
// 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 ImmPtr {
explicit ImmPtr(void* value)
: m_value(value)
{
}
intptr_t asIntptr()
{
return reinterpret_cast<intptr_t>(m_value);
}
void* m_value;
};
// Imm32:
//
// 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 Imm32 {
explicit Imm32(int32_t value)
: m_value(value)
{
}
#if !PLATFORM(X86_64)
explicit Imm32(ImmPtr ptr)
: m_value(ptr.asIntptr())
{
}
#endif
int32_t m_value;
};
// 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 Jump;
template<class AssemblerType_T>
friend class AbstractMacroAssembler;
friend class PatchBuffer;
public:
Label()
{
}
Label(AbstractMacroAssembler<AssemblerType>* masm)
: m_label(masm->m_assembler.label())
{
}
bool isUsed() const { return m_label.isUsed(); }
void used() { m_label.used(); }
private:
JmpDst 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 {
template<class AssemblerType_T>
friend class AbstractMacroAssembler;
friend class PatchBuffer;
public:
DataLabelPtr()
{
}
DataLabelPtr(AbstractMacroAssembler<AssemblerType>* masm)
: m_label(masm->m_assembler.label())
{
}
private:
JmpDst m_label;
};
// DataLabel32:
//
// 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 DataLabel32 {
template<class AssemblerType_T>
friend class AbstractMacroAssembler;
friend class PatchBuffer;
public:
DataLabel32()
{
}
DataLabel32(AbstractMacroAssembler<AssemblerType>* masm)
: m_label(masm->m_assembler.label())
{
}
private:
JmpDst 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 PatchBuffer;
template<class AssemblerType_T>
friend class AbstractMacroAssembler;
public:
enum Flags {
None = 0x0,
Linkable = 0x1,
Near = 0x2,
LinkableNear = 0x3,
};
Call()
: m_flags(None)
{
}
Call(JmpSrc jmp, Flags flags)
: m_jmp(jmp)
, m_flags(flags)
{
}
bool isFlagSet(Flags flag)
{
return m_flags & flag;
}
static Call fromTailJump(Jump jump)
{
return Call(jump.m_jmp, Linkable);
}
private:
JmpSrc m_jmp;
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 PatchBuffer;
template<class AssemblerType_T>
friend class AbstractMacroAssembler;
friend class Call;
public:
Jump()
{
}
Jump(JmpSrc jmp)
: m_jmp(jmp)
{
}
void link(AbstractMacroAssembler<AssemblerType>* masm)
{
masm->m_assembler.linkJump(m_jmp, masm->m_assembler.label());
}
void linkTo(Label label, AbstractMacroAssembler<AssemblerType>* masm)
{
masm->m_assembler.linkJump(m_jmp, label.m_label);
}
private:
JmpSrc m_jmp;
};
// JumpList:
//
// A JumpList is a set of Jump objects.
// All jumps in the set will be linked to the same destination.
class JumpList {
friend class PatchBuffer;
public:
void link(AbstractMacroAssembler<AssemblerType>* masm)
{
size_t size = m_jumps.size();
for (size_t i = 0; i < size; ++i)
m_jumps[i].link(masm);
m_jumps.clear();
}
void linkTo(Label label, AbstractMacroAssembler<AssemblerType>* masm)
{
size_t size = m_jumps.size();
for (size_t i = 0; i < size; ++i)
m_jumps[i].linkTo(label, masm);
m_jumps.clear();
}
void append(Jump jump)
{
m_jumps.append(jump);
}
void append(JumpList& other)
{
m_jumps.append(other.m_jumps.begin(), other.m_jumps.size());
}
bool empty()
{
return !m_jumps.size();
}
private:
Vector<Jump, 16> m_jumps;
};
// Section 3: MacroAssembler JIT instruction stream handles.
//
// The MacroAssembler supported facilities to modify a JIT generated
// instruction stream after it has been generated (relinking calls and
// jumps, and repatching data values). The following types are used
// to store handles into the underlying instruction stream, the type
// providing semantic information as to what it is that is in the
// instruction stream at this point, and thus what operations may be
// performed on it.
// CodeLocationCommon:
//
// Base type for other CodeLocation* types. A postion in the JIT genertaed
// instruction stream, without any semantic information.
class CodeLocationCommon {
public:
CodeLocationCommon()
: m_location(0)
{
}
// In order to avoid the need to store multiple handles into the
// instructions stream, where the code generation is deterministic
// and the labels will always be a fixed distance apart, these
// methods may be used to recover a handle that has nopw been
// retained, based on a known fixed relative offset from one that has.
CodeLocationLabel labelAtOffset(int offset);
CodeLocationJump jumpAtOffset(int offset);
CodeLocationCall callAtOffset(int offset);
CodeLocationDataLabelPtr dataLabelPtrAtOffset(int offset);
CodeLocationDataLabel32 dataLabel32AtOffset(int offset);
operator bool() { return m_location; }
void reset() { m_location = 0; }
protected:
explicit CodeLocationCommon(void* location)
: m_location(location)
{
}
void* m_location;
};
// CodeLocationLabel:
//
// A point in the JIT code maked with a label.
class CodeLocationLabel : public CodeLocationCommon {
friend class CodeLocationCommon;
friend class CodeLocationJump;
friend class PatchBuffer;
public:
CodeLocationLabel()
{
}
void* addressForSwitch() { return this->m_location; }
void* addressForExceptionHandler() { return this->m_location; }
void* addressForJSR() { return this->m_location; }
private:
explicit CodeLocationLabel(void* location)
: CodeLocationCommon(location)
{
}
void* getJumpDestination() { return this->m_location; }
};
// CodeLocationJump:
//
// A point in the JIT code at which there is a jump instruction.
class CodeLocationJump : public CodeLocationCommon {
friend class CodeLocationCommon;
friend class PatchBuffer;
public:
CodeLocationJump()
{
}
void relink(CodeLocationLabel destination)
{
AssemblerType::patchJump(reinterpret_cast<intptr_t>(this->m_location), destination.m_location);
}
private:
explicit CodeLocationJump(void* location)
: CodeLocationCommon(location)
{
}
};
// CodeLocationCall:
//
// A point in the JIT code at which there is a call instruction.
class CodeLocationCall : public CodeLocationCommon {
friend class CodeLocationCommon;
friend class PatchBuffer;
public:
CodeLocationCall()
{
}
template<typename FunctionSig>
void relink(FunctionSig* function)
{
AssemblerType::patchMacroAssemblerCall(reinterpret_cast<intptr_t>(this->m_location), reinterpret_cast<void*>(function));
}
// This methods returns the value that will be set as the return address
// within a function that has been called from this call instruction.
void* calleeReturnAddressValue()
{
return this->m_location;
}
private:
explicit CodeLocationCall(void* location)
: CodeLocationCommon(location)
{
}
};
// CodeLocationNearCall:
//
// A point in the JIT code at which there is a call instruction with near linkage.
class CodeLocationNearCall : public CodeLocationCommon {
friend class CodeLocationCommon;
friend class PatchBuffer;
public:
CodeLocationNearCall()
{
}
template<typename FunctionSig>
void relink(FunctionSig* function)
{
AssemblerType::patchCall(reinterpret_cast<intptr_t>(this->m_location), reinterpret_cast<void*>(function));
}
// This methods returns the value that will be set as the return address
// within a function that has been called from this call instruction.
void* calleeReturnAddressValue()
{
return this->m_location;
}
private:
explicit CodeLocationNearCall(void* location)
: CodeLocationCommon(location)
{
}
};
// CodeLocationDataLabel32:
//
// A point in the JIT code at which there is an int32_t immediate that may be repatched.
class CodeLocationDataLabel32 : public CodeLocationCommon {
friend class CodeLocationCommon;
friend class PatchBuffer;
public:
CodeLocationDataLabel32()
{
}
void repatch(int32_t value)
{
AssemblerType::patchImmediate(reinterpret_cast<intptr_t>(this->m_location), value);
}
private:
explicit CodeLocationDataLabel32(void* location)
: CodeLocationCommon(location)
{
}
};
// CodeLocationDataLabelPtr:
//
// A point in the JIT code at which there is a void* immediate that may be repatched.
class CodeLocationDataLabelPtr : public CodeLocationCommon {
friend class CodeLocationCommon;
friend class PatchBuffer;
public:
CodeLocationDataLabelPtr()
{
}
void repatch(void* value)
{
AssemblerType::patchPointer(reinterpret_cast<intptr_t>(this->m_location), reinterpret_cast<intptr_t>(value));
}
private:
explicit CodeLocationDataLabelPtr(void* location)
: CodeLocationCommon(location)
{
}
};
// ProcessorReturnAddress:
//
// This class can be used to relink a call identified by its return address.
class ProcessorReturnAddress {
public:
ProcessorReturnAddress(void* location)
: m_location(location)
{
}
template<typename FunctionSig>
void relinkCallerToFunction(FunctionSig* newCalleeFunction)
{
AssemblerType::patchMacroAssemblerCall(reinterpret_cast<intptr_t>(this->m_location), reinterpret_cast<void*>(newCalleeFunction));
}
template<typename FunctionSig>
void relinkNearCallerToFunction(FunctionSig* newCalleeFunction)
{
AssemblerType::patchCall(reinterpret_cast<intptr_t>(this->m_location), reinterpret_cast<void*>(newCalleeFunction));
}
operator void*()
{
return m_location;
}
private:
void* m_location;
};
// Section 4: The patch buffer - utility to finalize code generation.
// PatchBuffer:
//
// This class assists in linking code generated by the macro assembler, once code generation
// has been completed, and the code has been copied to is final location in memory. At this
// time pointers to labels within the code may be resolved, and relative offsets to external
// addresses may be fixed.
//
// Specifically:
// * Jump objects may be linked to external targets,
// * The address of Jump objects may taken, such that it can later be relinked.
// * The return address of a Jump object representing a call may be acquired.
// * The address of a Label pointing into the code may be resolved.
// * The value referenced by a DataLabel may be fixed.
//
// FIXME: distinguish between Calls & Jumps (make a specific call to obtain the return
// address of calls, as opposed to a point that can be used to later relink a Jump -
// possibly wrap the later up in an object that can do just that).
class PatchBuffer {
public:
PatchBuffer(void* code)
: m_code(code)
{
}
CodeLocationLabel entry()
{
return CodeLocationLabel(m_code);
}
void* trampolineAt(Label label)
{
return AssemblerType::getRelocatedAddress(m_code, label.m_label);
}
// These methods are used to link or set values at code generation time.
template<typename FunctionSig>
void link(Call call, FunctionSig* function)
{
ASSERT(call.isFlagSet(Call::Linkable));
#if PLATFORM(X86_64)
if (call.isFlagSet(Call::Near)) {
AssemblerType::linkCall(m_code, call.m_jmp, reinterpret_cast<void*>(function));
} else {
intptr_t callLocation = reinterpret_cast<intptr_t>(AssemblerType::getRelocatedAddress(m_code, call.m_jmp));
AssemblerType::patchMacroAssemblerCall(callLocation, reinterpret_cast<void*>(function));
}
#else
AssemblerType::linkCall(m_code, call.m_jmp, reinterpret_cast<void*>(function));
#endif
}
template<typename FunctionSig>
void linkTailRecursive(Jump jump, FunctionSig* function)
{
AssemblerType::linkJump(m_code, jump.m_jmp, reinterpret_cast<void*>(function));
}
template<typename FunctionSig>
void linkTailRecursive(JumpList list, FunctionSig* function)
{
for (unsigned i = 0; i < list.m_jumps.size(); ++i) {
AssemblerType::linkJump(m_code, list.m_jumps[i].m_jmp, reinterpret_cast<void*>(function));
}
}
void link(Jump jump, CodeLocationLabel label)
{
AssemblerType::linkJump(m_code, jump.m_jmp, label.m_location);
}
void link(JumpList list, CodeLocationLabel label)
{
for (unsigned i = 0; i < list.m_jumps.size(); ++i)
AssemblerType::linkJump(m_code, list.m_jumps[i].m_jmp, label.m_location);
}
void patch(DataLabelPtr label, void* value)
{
AssemblerType::patchAddress(m_code, label.m_label, value);
}
// These methods are used to obtain handles to allow the code to be relinked / repatched later.
CodeLocationCall locationOf(Call call)
{
ASSERT(call.isFlagSet(Call::Linkable));
ASSERT(!call.isFlagSet(Call::Near));
return CodeLocationCall(AssemblerType::getRelocatedAddress(m_code, call.m_jmp));
}
CodeLocationNearCall locationOfNearCall(Call call)
{
ASSERT(call.isFlagSet(Call::Linkable));
ASSERT(call.isFlagSet(Call::Near));
return CodeLocationNearCall(AssemblerType::getRelocatedAddress(m_code, call.m_jmp));
}
CodeLocationLabel locationOf(Label label)
{
return CodeLocationLabel(AssemblerType::getRelocatedAddress(m_code, label.m_label));
}
CodeLocationDataLabelPtr locationOf(DataLabelPtr label)
{
return CodeLocationDataLabelPtr(AssemblerType::getRelocatedAddress(m_code, label.m_label));
}
CodeLocationDataLabel32 locationOf(DataLabel32 label)
{
return CodeLocationDataLabel32(AssemblerType::getRelocatedAddress(m_code, label.m_label));
}
// This method obtains the return address of the call, given as an offset from
// the start of the code.
unsigned returnAddressOffset(Call call)
{
return AssemblerType::getCallReturnOffset(call.m_jmp);
}
private:
void* m_code;
};
// Section 5: Misc admin methods
size_t size()
{
return m_assembler.size();
}
void* copyCode(ExecutablePool* allocator)
{
return m_assembler.executableCopy(allocator);
}
Label label()
{
return Label(this);
}
Label align()
{
m_assembler.align(16);
return Label(this);
}
ptrdiff_t differenceBetween(Label from, Jump to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
}
ptrdiff_t differenceBetween(Label from, Call to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
}
ptrdiff_t differenceBetween(Label from, Label to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
}
ptrdiff_t differenceBetween(Label from, DataLabelPtr to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
}
ptrdiff_t differenceBetween(Label from, DataLabel32 to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_label);
}
ptrdiff_t differenceBetween(DataLabelPtr from, Jump to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
}
ptrdiff_t differenceBetween(DataLabelPtr from, Call to)
{
return AssemblerType::getDifferenceBetweenLabels(from.m_label, to.m_jmp);
}
protected:
AssemblerType m_assembler;
};
template <class AssemblerType>
typename AbstractMacroAssembler<AssemblerType>::CodeLocationLabel AbstractMacroAssembler<AssemblerType>::CodeLocationCommon::labelAtOffset(int offset)
{
return typename AbstractMacroAssembler::CodeLocationLabel(reinterpret_cast<char*>(m_location) + offset);
}
template <class AssemblerType>
typename AbstractMacroAssembler<AssemblerType>::CodeLocationJump AbstractMacroAssembler<AssemblerType>::CodeLocationCommon::jumpAtOffset(int offset)
{
return typename AbstractMacroAssembler::CodeLocationJump(reinterpret_cast<char*>(m_location) + offset);
}
template <class AssemblerType>
typename AbstractMacroAssembler<AssemblerType>::CodeLocationCall AbstractMacroAssembler<AssemblerType>::CodeLocationCommon::callAtOffset(int offset)
{
return typename AbstractMacroAssembler::CodeLocationCall(reinterpret_cast<char*>(m_location) + offset);
}
template <class AssemblerType>
typename AbstractMacroAssembler<AssemblerType>::CodeLocationDataLabelPtr AbstractMacroAssembler<AssemblerType>::CodeLocationCommon::dataLabelPtrAtOffset(int offset)
{
return typename AbstractMacroAssembler::CodeLocationDataLabelPtr(reinterpret_cast<char*>(m_location) + offset);
}
template <class AssemblerType>
typename AbstractMacroAssembler<AssemblerType>::CodeLocationDataLabel32 AbstractMacroAssembler<AssemblerType>::CodeLocationCommon::dataLabel32AtOffset(int offset)
{
return typename AbstractMacroAssembler::CodeLocationDataLabel32(reinterpret_cast<char*>(m_location) + offset);
}
} // namespace JSC
#endif // ENABLE(ASSEMBLER)
#endif // AbstractMacroAssembler_h
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