llvm-6502/tools/llvm-objdump/llvm-objdump.cpp

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//===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like binutils "objdump", that is, it
// dumps out a plethora of information about an object file depending on the
// flags.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/ObjectFile.h"
// This config must be included before llvm-config.h.
#include "llvm/Config/config.h"
#include "../../lib/MC/MCDisassembler/EDDisassembler.h"
#include "../../lib/MC/MCDisassembler/EDInst.h"
#include "../../lib/MC/MCDisassembler/EDOperand.h"
#include "../../lib/MC/MCDisassembler/EDToken.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Target/TargetSelect.h"
#include <algorithm>
#include <cctype>
#include <cerrno>
#include <cstring>
using namespace llvm;
using namespace object;
namespace {
cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),
cl::ZeroOrMore);
cl::opt<bool>
Disassemble("disassemble",
cl::desc("Display assembler mnemonics for the machine instructions"));
cl::alias
Disassembled("d", cl::desc("Alias for --disassemble"),
cl::aliasopt(Disassemble));
cl::opt<std::string>
TripleName("triple", cl::desc("Target triple to disassemble for, "
"see -version for available targets"));
cl::opt<std::string>
ArchName("arch", cl::desc("Target arch to disassemble for, "
"see -version for available targets"));
StringRef ToolName;
}
static const Target *GetTarget(const ObjectFile *Obj = NULL) {
// Figure out the target triple.
llvm::Triple TT("unknown-unknown-unknown");
if (TripleName.empty()) {
if (Obj)
TT.setArch(Triple::ArchType(Obj->getArch()));
} else
TT.setTriple(Triple::normalize(TripleName));
if (!ArchName.empty())
TT.setArchName(ArchName);
TripleName = TT.str();
// Get the target specific parser.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
if (TheTarget)
return TheTarget;
errs() << ToolName << ": error: unable to get target for '" << TripleName
<< "', see --version and --triple.\n";
return 0;
}
namespace {
class StringRefMemoryObject : public MemoryObject {
private:
StringRef Bytes;
public:
StringRefMemoryObject(StringRef bytes) : Bytes(bytes) {}
uint64_t getBase() const { return 0; }
uint64_t getExtent() const { return Bytes.size(); }
int readByte(uint64_t Addr, uint8_t *Byte) const {
if (Addr > getExtent())
return -1;
*Byte = Bytes[Addr];
return 0;
}
};
}
static void DumpBytes(StringRef bytes) {
static char hex_rep[] = "0123456789abcdef";
// FIXME: The real way to do this is to figure out the longest instruction
// and align to that size before printing. I'll fix this when I get
// around to outputting relocations.
// 15 is the longest x86 instruction
// 3 is for the hex rep of a byte + a space.
// 1 is for the null terminator.
enum { OutputSize = (15 * 3) + 1 };
char output[OutputSize];
assert(bytes.size() <= 15
&& "DumpBytes only supports instructions of up to 15 bytes");
memset(output, ' ', sizeof(output));
unsigned index = 0;
for (StringRef::iterator i = bytes.begin(),
e = bytes.end(); i != e; ++i) {
output[index] = hex_rep[(*i & 0xF0) >> 4];
output[index + 1] = hex_rep[*i & 0xF];
index += 3;
}
output[sizeof(output) - 1] = 0;
outs() << output;
}
static void DisassembleInput(const StringRef &Filename) {
OwningPtr<MemoryBuffer> Buff;
if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
errs() << ToolName << ": " << Filename << ": " << ec.message() << "\n";
return;
}
OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
const Target *TheTarget = GetTarget(Obj.get());
if (!TheTarget) {
// GetTarget prints out stuff.
return;
}
outs() << '\n';
outs() << Filename
<< ":\tfile format " << Obj->getFileFormatName() << "\n\n\n";
for (ObjectFile::section_iterator i = Obj->begin_sections(),
e = Obj->end_sections();
i != e; ++i) {
if (!i->isText())
continue;
outs() << "Disassembly of section " << i->getName() << ":\n\n";
// Set up disassembler.
OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createAsmInfo(TripleName));
if (!AsmInfo) {
errs() << "error: no assembly info for target " << TripleName << "\n";
return;
}
OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler());
if (!DisAsm) {
errs() << "error: no disassembler for target " << TripleName << "\n";
return;
}
// FIXME: We shouldn't need to do this (and link in codegen).
// When we split this out, we should do it in a way that makes
// it straightforward to switch subtargets on the fly (.e.g,
// the .cpu and .code16 directives).
std::string FeaturesStr;
OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName,
FeaturesStr));
if (!TM) {
errs() << "error: could not create target for triple " << TripleName << "\n";
return;
}
int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
*TM, AsmPrinterVariant, *AsmInfo));
if (!IP) {
errs() << "error: no instruction printer for target " << TripleName << '\n';
return;
}
StringRef Bytes = i->getContents();
StringRefMemoryObject memoryObject(Bytes);
uint64_t Size;
uint64_t Index;
for (Index = 0; Index < Bytes.size(); Index += Size) {
MCInst Inst;
# ifndef NDEBUG
raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
# else
raw_ostream &DebugOut = nulls();
# endif
if (DisAsm->getInstruction(Inst, Size, memoryObject, Index, DebugOut)) {
outs() << format("%8x:\t", i->getAddress() + Index);
DumpBytes(StringRef(Bytes.data() + Index, Size));
IP->printInst(&Inst, outs());
outs() << "\n";
} else {
errs() << ToolName << ": warning: invalid instruction encoding\n";
if (Size == 0)
Size = 1; // skip illegible bytes
}
}
}
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
// FIXME: We shouldn't need to initialize the Target(Machine)s.
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
TripleName = Triple::normalize(TripleName);
ToolName = argv[0];
// Defaults to a.out if no filenames specified.
if (InputFilenames.size() == 0)
InputFilenames.push_back("a.out");
// -d is the only flag that is currently implemented, so just print help if
// it is not set.
if (!Disassemble) {
cl::PrintHelpMessage();
return 2;
}
std::for_each(InputFilenames.begin(), InputFilenames.end(),
DisassembleInput);
return 0;
}