swh:1:snp:a72e953ecd624a7df6e6196bbdd05851996c5e40
Tip revision: a2f713dea5ac6320d8dcf2835ac4a37ea751af05 authored by Tony Kelman on 12 January 2016, 21:37:53 UTC
Tag v0.4.3
Tag v0.4.3
Tip revision: a2f713d
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 <cstdio>
#include <cstring>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <string>
#include "llvm-version.h"
#include <llvm/Object/ObjectFile.h>
#include <llvm/Support/MachO.h>
#include <llvm/Support/COFF.h>
#include <llvm/MC/MCDisassembler.h>
#include <llvm/MC/MCInst.h>
#include <llvm/MC/MCStreamer.h>
#include <llvm/MC/MCSubtargetInfo.h>
#include <llvm/MC/MCObjectFileInfo.h>
#include <llvm/MC/MCRegisterInfo.h>
#include <llvm/MC/MCAsmInfo.h>
#include <llvm/MC/MCAsmBackend.h>
#include <llvm/MC/MCCodeEmitter.h>
#include <llvm/MC/MCInstPrinter.h>
#include <llvm/MC/MCInstrInfo.h>
#include <llvm/MC/MCContext.h>
#include <llvm/MC/MCExpr.h>
#include <llvm/MC/MCInstrAnalysis.h>
#include <llvm/MC/MCSymbol.h>
#ifdef LLVM35
#include <llvm/AsmParser/Parser.h>
#include <llvm/MC/MCExternalSymbolizer.h>
#else
#include <llvm/Assembly/Parser.h>
#include <llvm/ADT/OwningPtr.h>
#endif
#include <llvm/ADT/Triple.h>
#include <llvm/Support/MemoryBuffer.h>
#include <llvm/Support/MemoryObject.h>
#include <llvm/Support/SourceMgr.h>
#include <llvm/Support/TargetRegistry.h>
#include <llvm/Support/Host.h>
#include "llvm/Support/TargetSelect.h"
#include <llvm/Support/raw_ostream.h>
#include "llvm/Support/FormattedStream.h"
#ifndef LLVM35
#include <llvm/Support/system_error.h>
#endif
#include <llvm/ExecutionEngine/JITEventListener.h>
#include <llvm/IR/LLVMContext.h>
#include <llvm/DebugInfo/DIContext.h>
#ifdef LLVM37
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#endif
#ifdef LLVM35
#include <llvm/IR/DebugInfo.h>
#else
#include <llvm/DebugInfo.h>
#endif
#ifndef LLVM37
#define format_hex(v, d) format("%#0" #d "x", v)
#endif
#include "julia.h"
#include "julia_internal.h"
using namespace llvm;
extern DLLEXPORT LLVMContext &jl_LLVMContext;
namespace {
#ifdef LLVM36
#define FuncMCView ArrayRef<uint8_t>
#else
class FuncMCView : public MemoryObject {
private:
const char *Fptr;
const size_t Fsize;
public:
FuncMCView(const void *fptr, size_t size) : Fptr((const char*)fptr), Fsize(size) {}
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;
}
// ArrayRef-like accessors:
const char operator[] (const size_t idx) const { return Fptr[idx]; }
uint64_t size() const { return Fsize; }
const uint8_t *data() const { return (const uint8_t*)Fptr; }
FuncMCView slice(unsigned N) const { return FuncMCView(Fptr+N, Fsize-N); }
};
#endif
// Look up a symbol, and return a const char* to its name when the
// address matches. We currently just use "L<address>" as name for the
// symbol. We could easily get more fancy, e.g. numbering symbols
// sequentially or encoding the line number, but that doesn't seem
// necessary.
class SymbolTable {
typedef std::map<uint64_t, MCSymbol*> TableType;
TableType Table;
std::string TempName;
MCContext& Ctx;
const FuncMCView &MemObj;
int Pass;
uint64_t ip; // virtual instruction pointer of the current instruction
public:
SymbolTable(MCContext &Ctx, const FuncMCView &MemObj):
Ctx(Ctx), MemObj(MemObj), ip(0) {}
const FuncMCView &getMemoryObject() const { return MemObj; }
void setPass(int Pass) { this->Pass = Pass; }
int getPass() const { return Pass; }
void insertAddress(uint64_t addr);
// void createSymbol(const char *name, uint64_t addr);
void createSymbols();
const char *lookupSymbol(uint64_t addr);
void setIP(uint64_t addr);
uint64_t getIP() const;
};
void SymbolTable::setIP(uint64_t addr)
{
ip = addr;
}
uint64_t SymbolTable::getIP() const
{
return ip;
}
// Insert an address
void SymbolTable::insertAddress(uint64_t addr)
{
Table[addr] = NULL;
}
// Create a symbol
// void SymbolTable::createSymbol(const char *name, uint64_t addr)
// {
// MCSymbol *symb = Ctx.GetOrCreateSymbol(StringRef(name));
// symb->setVariableValue(MCConstantExpr::Create(addr, Ctx));
// }
// Create symbols for all addresses
void SymbolTable::createSymbols()
{
for (TableType::iterator isymb = Table.begin(), esymb = Table.end();
isymb != esymb; ++isymb) {
uint64_t addr = isymb->first - ip;
std::ostringstream name;
name << "L" << addr;
#ifdef LLVM37
MCSymbol *symb = Ctx.getOrCreateSymbol(StringRef(name.str()));
symb->setVariableValue(MCConstantExpr::create(addr, Ctx));
#else
MCSymbol *symb = Ctx.GetOrCreateSymbol(StringRef(name.str()));
symb->setVariableValue(MCConstantExpr::Create(addr, Ctx));
#endif
isymb->second = symb;
}
}
const char *SymbolTable::lookupSymbol(uint64_t addr)
{
if (!Table.count(addr)) return NULL;
MCSymbol *symb = Table[addr];
TempName = symb->getName().str();
return TempName.c_str();
}
const char *SymbolLookup(void *DisInfo,
uint64_t ReferenceValue,
uint64_t *ReferenceType,
uint64_t ReferencePC,
const char **ReferenceName)
{
SymbolTable *SymTab = (SymbolTable*)DisInfo;
if (SymTab->getPass() != 0) {
if (*ReferenceType == LLVMDisassembler_ReferenceType_In_Branch) {
uint64_t addr = ReferenceValue + SymTab->getIP();
const char *symbolName = SymTab->lookupSymbol(addr);
*ReferenceType = LLVMDisassembler_ReferenceType_InOut_None;
*ReferenceName = NULL;
return symbolName;
}
}
*ReferenceType = LLVMDisassembler_ReferenceType_InOut_None;
*ReferenceName = NULL;
return NULL;
}
int OpInfoLookup(void *DisInfo, uint64_t PC,
uint64_t Offset, uint64_t Size,
int TagType, void *TagBuf)
{
SymbolTable *SymTab = (SymbolTable*)DisInfo;
PC += SymTab->getIP() - (uint64_t)(uintptr_t)SymTab->getMemoryObject().data(); // add offset from MemoryObject base
if (TagType != 1)
return 0; // Unknown data format
LLVMOpInfo1 *info = (LLVMOpInfo1*)TagBuf;
uint8_t *bytes = (uint8_t*) alloca(Size*sizeof(uint8_t));
if (PC+Offset+Size > SymTab->getMemoryObject().size())
return 0; // Invalid memory location
for (uint64_t i=0; i<Size; ++i)
bytes[i] = SymTab->getMemoryObject()[PC+Offset+i];
size_t pointer;
switch (Size) {
case 1: { uint8_t val; std::memcpy(&val, bytes, 1); pointer = val; break; }
case 2: { uint16_t val; std::memcpy(&val, bytes, 2); pointer = val; break; }
case 4: { uint32_t val; std::memcpy(&val, bytes, 4); pointer = val; break; }
case 8: { uint64_t val; std::memcpy(&val, bytes, 8); pointer = val; break; }
default: return 0; // Cannot handle input address size
}
int skipC = 0;
char *name;
char *filename;
size_t line;
char *inlinedat_file;
size_t inlinedat_line;
int fromC;
jl_getFunctionInfo(&name, &filename, &line, &inlinedat_file, &inlinedat_line, pointer, &fromC, skipC, 1);
free(filename);
free(inlinedat_file);
if (!name)
return 0; // Did not find symbolic information
// Describe the symbol
info->AddSymbol.Present = 1;
info->AddSymbol.Name = name;
info->AddSymbol.Value = pointer; // unused by LLVM
info->Value = 0; // offset
return 1; // Success
}
} // namespace
extern "C"
void jl_dump_asm_internal(uintptr_t Fptr, size_t Fsize, size_t slide,
#ifndef USE_MCJIT
std::vector<JITEvent_EmittedFunctionDetails::LineStart> lineinfo,
#else
const object::ObjectFile *objectfile,
#endif
#ifdef LLVM37
raw_ostream &stream
#else
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();
#ifdef _CPU_ARM_
// The Raspberry Pi CPU is misdetected by LLVM (at least of version
// 3.6); correct this.
if (MCPU == "arm1176jz-s")
MCPU = "arm1176jzf-s";
#endif
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
#ifdef LLVM37
MOFI->InitMCObjectFileInfo(TheTriple, Reloc::Default, CodeModel::Default, Ctx);
#else
MOFI->InitMCObjectFileInfo(TripleName, Reloc::Default, CodeModel::Default, Ctx);
#endif
// Set up Subtarget and Disassembler
#ifdef LLVM35
std::unique_ptr<MCSubtargetInfo>
STI(TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
std::unique_ptr<MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI, Ctx));
#else
OwningPtr<MCSubtargetInfo>
STI(TheTarget->createMCSubtargetInfo(TripleName, MCPU, Features.getString()));
OwningPtr<MCDisassembler> DisAsm(TheTarget->createMCDisassembler(*STI));
#endif
if (!DisAsm) {
jl_printf(JL_STDERR, "ERROR: no disassembler for target %s\n",
TripleName.c_str());
return;
}
unsigned OutputAsmVariant = 0; // ATT or Intel-style assembly
bool ShowEncoding = false;
bool ShowInst = false;
#ifdef LLVM35
std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
std::unique_ptr<MCInstrAnalysis>
MCIA(TheTarget->createMCInstrAnalysis(MCII.get()));
#else
OwningPtr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
OwningPtr<MCInstrAnalysis>
MCIA(TheTarget->createMCInstrAnalysis(MCII.get()));
#endif
#ifdef LLVM37
MCInstPrinter* IP =
TheTarget->createMCInstPrinter(TheTriple, OutputAsmVariant, *MAI, *MCII, *MRI);
#else
MCInstPrinter* IP =
TheTarget->createMCInstPrinter(OutputAsmVariant, *MAI, *MCII, *MRI, *STI);
#endif
MCCodeEmitter *CE = 0;
MCAsmBackend *MAB = 0;
if (ShowEncoding) {
#ifdef LLVM37
CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
#else
CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
#endif
#ifdef LLVM34
MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, MCPU);
#else
MAB = TheTarget->createMCAsmBackend(TripleName, MCPU);
#endif
}
#ifdef LLVM37
auto ustream = llvm::make_unique<formatted_raw_ostream>(stream);
Streamer.reset(TheTarget->createAsmStreamer(Ctx, std::move(ustream), /*asmverbose*/true,
#else
Streamer.reset(TheTarget->createAsmStreamer(Ctx, stream, /*asmverbose*/true,
#endif
#ifndef LLVM35
/*useLoc*/ true,
/*useCFI*/ true,
#endif
/*useDwarfDirectory*/ true,
IP, CE, MAB, ShowInst));
#ifdef LLVM36
Streamer->InitSections(true);
#else
Streamer->InitSections();
#endif
// Make the MemoryObject wrapper
#ifdef LLVM36
ArrayRef<uint8_t> memoryObject(const_cast<uint8_t*>((const uint8_t*)Fptr),Fsize);
#else
FuncMCView memoryObject((const uint8_t*)Fptr, Fsize);
#endif
SymbolTable DisInfo(Ctx, memoryObject);
#ifdef USE_MCJIT
if (!objectfile) return;
#ifdef LLVM37
DIContext *di_ctx = new DWARFContextInMemory(*objectfile);
#elif LLVM36
DIContext *di_ctx = DIContext::getDWARFContext(*objectfile);
#else
DIContext *di_ctx = DIContext::getDWARFContext(const_cast<object::ObjectFile*>(objectfile));
#endif
if (di_ctx == NULL) return;
DILineInfoTable lineinfo = di_ctx->getLineInfoForAddressRange(Fptr-slide, Fsize);
#else
typedef std::vector<JITEvent_EmittedFunctionDetails::LineStart> LInfoVec;
#endif
// Take two passes: In the first pass we record all branch labels,
// in the second we actually perform the output
for (int pass = 0; pass < 2; ++ pass) {
DisInfo.setPass(pass);
if (pass != 0) {
// Switch to symbolic disassembly. We cannot do this
// before the first pass, because this changes branch
// targets from immediate values (constants) to
// expressions, which are not handled correctly by
// MCIA->evaluateBranch. (It should be possible to rewrite
// this routine to handle this case correctly as well.)
// Could add OpInfoLookup here
#ifdef LLVM35
DisAsm->setSymbolizer(std::unique_ptr<MCSymbolizer>(new MCExternalSymbolizer(
Ctx,
std::unique_ptr<MCRelocationInfo>(new MCRelocationInfo(Ctx)),
OpInfoLookup,
SymbolLookup,
&DisInfo)));
#elif defined LLVM34
OwningPtr<MCRelocationInfo> relinfo(new MCRelocationInfo(Ctx));
DisAsm->setupForSymbolicDisassembly(
OpInfoLookup, SymbolLookup, &DisInfo, &Ctx,
relinfo);
#else
DisAsm->setupForSymbolicDisassembly(
OpInfoLookup, SymbolLookup, &DisInfo, &Ctx);
#endif
}
uint64_t nextLineAddr = -1;
#ifdef USE_MCJIT
// Set up the line info
DILineInfoTable::iterator lineIter = lineinfo.begin();
DILineInfoTable::iterator lineEnd = lineinfo.end();
if (lineIter != lineEnd) {
nextLineAddr = lineIter->first;
if (pass != 0) {
#ifdef LLVM35
stream << "Filename: " << lineIter->second.FileName << "\n";
#else
stream << "Filename: " << lineIter->second.getFileName() << "\n";
#endif
}
}
#else
// Set up the line info
LInfoVec::iterator lineIter = lineinfo.begin();
LInfoVec::iterator lineEnd = lineinfo.end();
if (lineIter != lineEnd) {
nextLineAddr = (*lineIter).Address;
DISubprogram debugscope = DISubprogram((*lineIter).Loc.getScope(jl_LLVMContext));
if (pass != 0) {
stream << "Filename: " << debugscope.getFilename() << "\n";
stream << "Source line: " << (*lineIter).Loc.getLine() << "\n";
}
}
#endif
uint64_t Index = 0;
uint64_t insSize = 0;
// Do the disassembly
for (Index = 0; Index < Fsize; Index += insSize) {
if (nextLineAddr != (uint64_t)-1 && Index + Fptr - slide == nextLineAddr) {
#ifdef USE_MCJIT
#ifdef LLVM35
if (pass != 0)
stream << "Source line: " << lineIter->second.Line << "\n";
#else
if (pass != 0)
stream << "Source line: " << lineIter->second.getLine() << "\n";
#endif
nextLineAddr = (++lineIter)->first;
#else
if (pass != 0)
stream << "Source line: " << (*lineIter).Loc.getLine() << "\n";
nextLineAddr = (*++lineIter).Address;
#endif
}
DisInfo.setIP(Fptr+Index);
if (pass != 0) {
// Uncomment this to output addresses for all instructions
// stream << Index << ": ";
const char *symbolName = DisInfo.lookupSymbol(Fptr+Index);
if (symbolName)
stream << symbolName << ":";
}
MCInst Inst;
MCDisassembler::DecodeStatus S;
#if defined(_CPU_PPC64_) && BYTE_ORDER == LITTLE_ENDIAN
// llvm doesn't know that POWER8 can have little-endian instruction order
unsigned char byte_swap_buf[4];
assert(memoryObject.size() >= 4);
byte_swap_buf[3] = memoryObject[Index+0];
byte_swap_buf[2] = memoryObject[Index+1];
byte_swap_buf[1] = memoryObject[Index+2];
byte_swap_buf[0] = memoryObject[Index+3];
FuncMCView view = FuncMCView(byte_swap_buf, 4);
#else
FuncMCView view = memoryObject.slice(Index);
#endif
S = DisAsm->getInstruction(Inst, insSize, view, 0,
/*REMOVE*/ nulls(), nulls());
switch (S) {
case MCDisassembler::Fail:
if (pass != 0)
#if defined(_CPU_PPC_) || defined(_CPU_PPC64_) || defined(_CPU_ARM_)
stream << "\t.long " << format_hex(*(uint32_t*)(Fptr+Index), 10) << "\n";
#elif defined(_CPU_X86_) || defined(_CPU_X86_64_)
SrcMgr.PrintMessage(SMLoc::getFromPointer((const char*)(Fptr + Index)),
SourceMgr::DK_Warning,
"invalid instruction encoding");
#else
stream << "\t.byte " << format_hex(*(uint8_t*)(Fptr+Index), 4) << "\n";
#endif
if (insSize == 0) // skip illegible bytes
#if defined(_CPU_PPC_) || defined(_CPU_PPC64_) || defined(_CPU_ARM_)
insSize = 4; // instructions are always 4 bytes
#else
insSize = 1; // attempt to slide 1 byte forward
#endif
break;
case MCDisassembler::SoftFail:
if (pass != 0)
#if !defined(_CPU_X86_) || !defined(_CPU_X86_64_)
stream << "potentially undefined instruction encoding:\n";
#else
SrcMgr.PrintMessage(SMLoc::getFromPointer((const char*)(Fptr + Index)),
SourceMgr::DK_Warning,
"potentially undefined instruction encoding");
#endif
// Fall through
case MCDisassembler::Success:
if (pass == 0) {
// Pass 0: Record all branch targets
if (MCIA && MCIA->isBranch(Inst)) {
uint64_t addr;
#ifdef LLVM34
if (MCIA->evaluateBranch(Inst, Fptr+Index, insSize, addr))
#else
if ((addr = MCIA->evaluateBranch(Inst, Fptr+Index, insSize)) != (uint64_t)-1)
#endif
DisInfo.insertAddress(addr);
}
}
else {
// Pass 1: Output instruction
#ifdef LLVM35
Streamer->EmitInstruction(Inst, *STI);
#else
Streamer->EmitInstruction(Inst);
#endif
}
break;
}
}
DisInfo.setIP(Fptr);
if (pass == 0)
DisInfo.createSymbols();
}
}