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A64DOpcode.h
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81 lines (66 loc) · 2.75 KB
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/*
* Copyright (C) 2012-2023 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 <stdint.h>
#include <wtf/Assertions.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC { namespace ARM64Disassembler {
class A64DOpcode {
public:
A64DOpcode(uint32_t* startPC = nullptr, uint32_t* endPC = nullptr)
: m_startPC(startPC)
, m_endPC(endPC)
, m_currentPC(nullptr)
, m_bufferOffset(0)
, m_builtConstant(0)
, m_moveWideDestReg(255)
{
m_formatBuffer[0] = '\0';
}
const char* disassemble(uint32_t* currentPC);
private:
void bufferPrintf(const char* format, ...) WTF_ATTRIBUTE_PRINTF(2, 3);
// Append PC-relative target address with JSC-specific metadata
void appendPCRelativeOffset(uint32_t* pc, int32_t immediate);
// MoveWide constant tracking across instruction sequences
void trackMoveWideConstant(int category, int64_t immediate, uint8_t shiftAmount, uint8_t destRegister, uint8_t is64Bit);
void maybeAnnotateBuiltConstant();
// JSC pointer analysis
bool handlePotentialDataPointer(void* ptr);
#if CPU(ARM64E)
bool handlePotentialPtrTag(uintptr_t value);
#endif
static constexpr int bufferSize = 512;
char m_formatBuffer[bufferSize];
uint32_t* m_startPC;
uint32_t* m_endPC;
uint32_t* m_currentPC;
int m_bufferOffset;
uintptr_t m_builtConstant;
uint8_t m_moveWideDestReg;
};
} } // namespace JSC::ARM64Disassembler
using JSC::ARM64Disassembler::A64DOpcode;
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END