swh:1:snp:a72e953ecd624a7df6e6196bbdd05851996c5e40
Tip revision: c03f413bbdb46c00033f4eaad402995cfe3b7be5 authored by Elliot Saba on 21 September 2014, 21:30:46 UTC
Tag v0.3.1
Tag v0.3.1
Tip revision: c03f413
disasm.cpp
//===------------- Disassembler for in-memory function --------------------===//
//
// Modified for use in The Julia Language from code in the llvm-mc project:
// llvm-mc.cpp and Disassembler.cpp
//
// Original copyright:
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements a disassembler of a memory block, given a function
// pointer and size.
//
//===----------------------------------------------------------------------===//
#include <string>
#include <iostream>
using namespace llvm;
namespace {
class FuncMCView : public MemoryObject {
private:
const char *Fptr;
size_t Fsize;
public:
FuncMCView(const void *fptr, size_t size) : Fptr((const char*)fptr), Fsize(size) {}
const char *operator[] (const size_t idx) { return (Fptr+idx); }
uint64_t getBase() const { return 0; }
uint64_t getExtent() const { return Fsize; }
int readByte(uint64_t Addr, uint8_t *Byte) const {
if (Addr >= getExtent())
return -1;
*Byte = Fptr[Addr];
return 0;
}
};
}
#ifndef USE_MCJIT
extern "C"
void jl_dump_function_asm(void *Fptr, size_t Fsize,
std::vector<JITEvent_EmittedFunctionDetails::LineStart> lineinfo,
formatted_raw_ostream &stream) {
#else
extern "C"
void jl_dump_function_asm(void *Fptr, size_t Fsize,
object::ObjectFile *objectfile,
formatted_raw_ostream &stream) {
#endif
// Initialize targets and assembly printers/parsers.
// Avoids hard-coded targets - will generally be only host CPU anyway.
llvm::InitializeNativeTargetAsmParser();
llvm::InitializeNativeTargetDisassembler();
// Get the host information
std::string TripleName;
if (TripleName.empty())
TripleName = sys::getDefaultTargetTriple();
Triple TheTriple(Triple::normalize(TripleName));
std::string MCPU = sys::getHostCPUName();
SubtargetFeatures Features;
Features.getDefaultSubtargetFeatures(TheTriple);
std::string err;
const Target* TheTarget = TargetRegistry::lookupTarget(TripleName, err);
// Set up required helpers and streamer
#ifdef LLVM35
std::unique_ptr<MCStreamer> Streamer;
#else
OwningPtr<MCStreamer> Streamer;
#endif
SourceMgr SrcMgr;
#ifdef LLVM35
std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*TheTarget->createMCRegInfo(TripleName),TripleName));
#elif defined(LLVM34)
llvm::OwningPtr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*TheTarget->createMCRegInfo(TripleName),TripleName));
#else
llvm::OwningPtr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(TripleName));
#endif
assert(MAI && "Unable to create target asm info!");
#ifdef LLVM35
std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
#else
llvm::OwningPtr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
#endif
assert(MRI && "Unable to create target register info!");
#ifdef LLVM35
std::unique_ptr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
#else
OwningPtr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
#endif
#ifdef LLVM34
MCContext Ctx(MAI.get(), MRI.get(), MOFI.get(), &SrcMgr);
#else
MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr);
#endif
MOFI->InitMCObjectFileInfo(TripleName, Reloc::Default, CodeModel::Default, Ctx);
// Set up Subtarget and Disassembler
#ifdef LLVM35
std::unique_ptr<MCSubtargetInfo>
STI(TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
std::unique_ptr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI, Ctx));
#else
OwningPtr<MCSubtargetInfo>
STI(TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
#endif
if (!DisAsm) {
JL_PRINTF(JL_STDERR, "error: no disassembler for target", TripleName.c_str(), "\n");
return;
}
unsigned OutputAsmVariant = 1;
bool ShowEncoding = false;
bool ShowInst = false;
#ifdef LLVM35
std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
#else
OwningPtr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
#endif
MCInstPrinter* IP =
TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *MCII, *MRI, *STI);
MCCodeEmitter *CE = 0;
MCAsmBackend *MAB = 0;
if (ShowEncoding) {
CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
#ifdef LLVM34
MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, MCPU);
#else
MAB = TheTarget->createMCAsmBackend(TripleName, MCPU);
#endif
}
Streamer.reset(TheTarget->createAsmStreamer(Ctx, stream, /*asmverbose*/true,
#ifndef LLVM35
/*useLoc*/ true,
/*useCFI*/ true,
#endif
/*useDwarfDirectory*/ true,
IP, CE, MAB, ShowInst));
Streamer->InitSections();
#ifndef USE_MCJIT
// LLVM33 version
// Make the MemoryObject wrapper
FuncMCView memoryObject(Fptr, Fsize);
uint64_t Size = 0;
uint64_t Index = 0;
uint64_t absAddr = 0;
// Set up the line info
typedef std::vector<JITEvent_EmittedFunctionDetails::LineStart> LInfoVec;
LInfoVec::iterator lineIter = lineinfo.begin();
lineIter = lineinfo.begin();
uint64_t nextLineAddr = -1;
DISubprogram debugscope;
if (lineIter != lineinfo.end()) {
nextLineAddr = (*lineIter).Address;
debugscope = DISubprogram((*lineIter).Loc.getScope(jl_LLVMContext));
stream << "Filename: " << debugscope.getFilename() << "\n";
stream << "Source line: " << (*lineIter).Loc.getLine() << "\n";
}
// Do the disassembly
for (Index = 0, absAddr = (uint64_t)Fptr;
Index < memoryObject.getExtent(); Index += Size, absAddr += Size) {
if (nextLineAddr != (uint64_t)-1 && absAddr == nextLineAddr) {
stream << "Source line: " << (*lineIter).Loc.getLine() << "\n";
nextLineAddr = (*++lineIter).Address;
}
MCInst Inst;
MCDisassembler::DecodeStatus S;
S = DisAsm->getInstruction(Inst, Size, memoryObject, Index,
/*REMOVE*/ nulls(), nulls());
switch (S) {
case MCDisassembler::Fail:
SrcMgr.PrintMessage(SMLoc::getFromPointer(memoryObject[Index]),
SourceMgr::DK_Warning,
"invalid instruction encoding");
if (Size == 0)
Size = 1; // skip illegible bytes
break;
case MCDisassembler::SoftFail:
SrcMgr.PrintMessage(SMLoc::getFromPointer(memoryObject[Index]),
SourceMgr::DK_Warning,
"potentially undefined instruction encoding");
// Fall through
case MCDisassembler::Success:
#ifdef LLVM35
Streamer->EmitInstruction(Inst, *STI);
#else
Streamer->EmitInstruction(Inst);
#endif
break;
}
}
#else // MCJIT version
FuncMCView memoryObject(Fptr, Fsize); // MemoryObject wrapper
if (!objectfile) return;
#ifdef LLVM36
DIContext *di_ctx = DIContext::getDWARFContext(*objectfile);
#else
DIContext *di_ctx = DIContext::getDWARFContext(objectfile);
#endif
if (di_ctx == NULL) return;
DILineInfoTable lineinfo = di_ctx->getLineInfoForAddressRange((size_t)Fptr, Fsize);
// Set up the line info
DILineInfoTable::iterator lines_iter = lineinfo.begin();
DILineInfoTable::iterator lines_end = lineinfo.end();
uint64_t nextLineAddr = -1;
if (lines_iter != lineinfo.end()) {
nextLineAddr = lines_iter->first;
#ifdef LLVM35
stream << "Filename: " << lines_iter->second.FileName << "\n";
#else
stream << "Filename: " << lines_iter->second.getFileName() << "\n";
#endif
}
uint64_t Index = 0;
uint64_t absAddr = 0;
uint64_t insSize = 0;
// Do the disassembly
for (Index = 0, absAddr = (uint64_t)Fptr;
Index < memoryObject.getExtent(); Index += insSize, absAddr += insSize) {
if (nextLineAddr != (uint64_t)-1 && absAddr == nextLineAddr) {
#ifdef LLVM35
stream << "Source line: " << lines_iter->second.Line << "\n";
#else
stream << "Source line: " << lines_iter->second.getLine() << "\n";
#endif
nextLineAddr = (++lines_iter)->first;
}
MCInst Inst;
MCDisassembler::DecodeStatus S;
S = DisAsm->getInstruction(Inst, insSize, memoryObject, Index,
/*REMOVE*/ nulls(), nulls());
switch (S) {
case MCDisassembler::Fail:
SrcMgr.PrintMessage(SMLoc::getFromPointer(memoryObject[Index]),
SourceMgr::DK_Warning,
"invalid instruction encoding");
if (insSize == 0)
insSize = 1; // skip illegible bytes
break;
case MCDisassembler::SoftFail:
SrcMgr.PrintMessage(SMLoc::getFromPointer(memoryObject[Index]),
SourceMgr::DK_Warning,
"potentially undefined instruction encoding");
// Fall through
case MCDisassembler::Success:
#ifdef LLVM35
Streamer->EmitInstruction(Inst, *STI);
#else
Streamer->EmitInstruction(Inst);
#endif
break;
}
}
#endif
}