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Copy pathFTLUnwindInfo.cpp
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185 lines (151 loc) · 6.63 KB
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/*
* Copyright (C) 2013, 2014 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.
*/
#include "config.h"
#include "FTLUnwindInfo.h"
#if ENABLE(FTL_JIT)
#include <mach-o/compact_unwind_encoding.h>
#include <wtf/ListDump.h>
namespace JSC { namespace FTL {
UnwindInfo::UnwindInfo() { }
UnwindInfo::~UnwindInfo() { }
namespace {
struct CompactUnwind {
void* function;
uint32_t size;
compact_unwind_encoding_t encoding;
void* personality;
void* lsda;
};
} // anonymous namespace
bool UnwindInfo::parse(void* section, size_t size, GeneratedFunction generatedFunction)
{
m_registers.clear();
RELEASE_ASSERT(!!section == !!size);
if (!section)
return false;
RELEASE_ASSERT(size >= sizeof(CompactUnwind));
CompactUnwind* data = bitwise_cast<CompactUnwind*>(section);
RELEASE_ASSERT(!data->personality); // We don't know how to handle this.
RELEASE_ASSERT(!data->lsda); // We don't know how to handle this.
RELEASE_ASSERT(data->function == generatedFunction); // The unwind data better be for our function.
compact_unwind_encoding_t encoding = data->encoding;
RELEASE_ASSERT(!(encoding & UNWIND_IS_NOT_FUNCTION_START));
RELEASE_ASSERT(!(encoding & UNWIND_HAS_LSDA));
RELEASE_ASSERT(!(encoding & UNWIND_PERSONALITY_MASK));
#if CPU(X86_64)
RELEASE_ASSERT((encoding & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_RBP_FRAME);
int32_t offset = -((encoding & UNWIND_X86_64_RBP_FRAME_OFFSET) >> 16) * 8;
uint32_t nextRegisters = encoding;
for (unsigned i = 5; i--;) {
uint32_t currentRegister = nextRegisters & 7;
nextRegisters >>= 3;
switch (currentRegister) {
case UNWIND_X86_64_REG_NONE:
break;
case UNWIND_X86_64_REG_RBX:
m_registers.append(RegisterAtOffset(X86Registers::ebx, offset));
break;
case UNWIND_X86_64_REG_R12:
m_registers.append(RegisterAtOffset(X86Registers::r12, offset));
break;
case UNWIND_X86_64_REG_R13:
m_registers.append(RegisterAtOffset(X86Registers::r13, offset));
break;
case UNWIND_X86_64_REG_R14:
m_registers.append(RegisterAtOffset(X86Registers::r14, offset));
break;
case UNWIND_X86_64_REG_R15:
m_registers.append(RegisterAtOffset(X86Registers::r15, offset));
break;
case UNWIND_X86_64_REG_RBP:
m_registers.append(RegisterAtOffset(X86Registers::ebp, offset));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
offset += 8;
}
#elif CPU(ARM64)
RELEASE_ASSERT((encoding & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_FRAME);
m_registers.append(RegisterAtOffset(ARM64Registers::fp, 0));
int32_t offset = 0;
if (encoding & UNWIND_ARM64_FRAME_X19_X20_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::x19, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::x20, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_X21_X22_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::x21, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::x22, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_X23_X24_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::x23, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::x24, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_X25_X26_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::x25, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::x26, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_X27_X28_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::x27, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::x28, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_D8_D9_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::q8, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::q9, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_D10_D11_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::q10, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::q11, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_D12_D13_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::q12, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::q13, offset -= 8));
}
if (encoding & UNWIND_ARM64_FRAME_D14_D15_PAIR) {
m_registers.append(RegisterAtOffset(ARM64Registers::q14, offset -= 8));
m_registers.append(RegisterAtOffset(ARM64Registers::q15, offset -= 8));
}
#else
#error "Unrecognized architecture"
#endif
std::sort(m_registers.begin(), m_registers.end());
return true;
}
void UnwindInfo::dump(PrintStream& out) const
{
out.print(listDump(m_registers));
}
RegisterAtOffset* UnwindInfo::find(Reg reg) const
{
return tryBinarySearch<RegisterAtOffset, Reg>(m_registers, m_registers.size(), reg, RegisterAtOffset::getReg);
}
unsigned UnwindInfo::indexOf(Reg reg) const
{
if (RegisterAtOffset* pointer = find(reg))
return pointer - m_registers.begin();
return UINT_MAX;
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)