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dbc46d7dd8
I will save before I commit. I will save before I commit. I will save before I commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136007 91177308-0d34-0410-b5e6-96231b3b80d8
353 lines
11 KiB
C++
353 lines
11 KiB
C++
//===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This program is a utility that works like binutils "objdump", that is, it
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// dumps out a plethora of information about an object file depending on the
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// flags.
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//
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//===----------------------------------------------------------------------===//
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#include "MCFunction.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCInstrDesc.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/MemoryObject.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/system_error.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Target/TargetSelect.h"
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#include <algorithm>
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#include <cstring>
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using namespace llvm;
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using namespace object;
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namespace {
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cl::list<std::string>
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InputFilenames(cl::Positional, cl::desc("<input object files>"),
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cl::ZeroOrMore);
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cl::opt<bool>
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Disassemble("disassemble",
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cl::desc("Display assembler mnemonics for the machine instructions"));
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cl::alias
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Disassembled("d", cl::desc("Alias for --disassemble"),
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cl::aliasopt(Disassemble));
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cl::opt<bool>
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CFG("cfg", cl::desc("Create a CFG for every symbol in the object file and"
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"write it to a graphviz file"));
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cl::opt<std::string>
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TripleName("triple", cl::desc("Target triple to disassemble for, "
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"see -version for available targets"));
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cl::opt<std::string>
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ArchName("arch", cl::desc("Target arch to disassemble for, "
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"see -version for available targets"));
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StringRef ToolName;
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bool error(error_code ec) {
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if (!ec) return false;
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outs() << ToolName << ": error reading file: " << ec.message() << ".\n";
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outs().flush();
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return true;
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}
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}
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static const Target *GetTarget(const ObjectFile *Obj = NULL) {
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// Figure out the target triple.
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llvm::Triple TT("unknown-unknown-unknown");
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if (TripleName.empty()) {
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if (Obj)
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TT.setArch(Triple::ArchType(Obj->getArch()));
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} else
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TT.setTriple(Triple::normalize(TripleName));
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if (!ArchName.empty())
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TT.setArchName(ArchName);
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TripleName = TT.str();
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// Get the target specific parser.
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
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if (TheTarget)
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return TheTarget;
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errs() << ToolName << ": error: unable to get target for '" << TripleName
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<< "', see --version and --triple.\n";
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return 0;
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}
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namespace {
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class StringRefMemoryObject : public MemoryObject {
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private:
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StringRef Bytes;
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public:
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StringRefMemoryObject(StringRef bytes) : Bytes(bytes) {}
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uint64_t getBase() const { return 0; }
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uint64_t getExtent() const { return Bytes.size(); }
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int readByte(uint64_t Addr, uint8_t *Byte) const {
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if (Addr >= getExtent())
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return -1;
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*Byte = Bytes[Addr];
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return 0;
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}
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};
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}
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static void DumpBytes(StringRef bytes) {
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static char hex_rep[] = "0123456789abcdef";
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// FIXME: The real way to do this is to figure out the longest instruction
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// and align to that size before printing. I'll fix this when I get
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// around to outputting relocations.
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// 15 is the longest x86 instruction
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// 3 is for the hex rep of a byte + a space.
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// 1 is for the null terminator.
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enum { OutputSize = (15 * 3) + 1 };
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char output[OutputSize];
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assert(bytes.size() <= 15
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&& "DumpBytes only supports instructions of up to 15 bytes");
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memset(output, ' ', sizeof(output));
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unsigned index = 0;
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for (StringRef::iterator i = bytes.begin(),
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e = bytes.end(); i != e; ++i) {
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output[index] = hex_rep[(*i & 0xF0) >> 4];
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output[index + 1] = hex_rep[*i & 0xF];
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index += 3;
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}
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output[sizeof(output) - 1] = 0;
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outs() << output;
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}
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static void DisassembleInput(const StringRef &Filename) {
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OwningPtr<MemoryBuffer> Buff;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
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errs() << ToolName << ": " << Filename << ": " << ec.message() << "\n";
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return;
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}
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OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
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const Target *TheTarget = GetTarget(Obj.get());
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if (!TheTarget) {
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// GetTarget prints out stuff.
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return;
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}
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const MCInstrInfo *InstrInfo = TheTarget->createMCInstrInfo();
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outs() << '\n';
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outs() << Filename
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<< ":\tfile format " << Obj->getFileFormatName() << "\n\n";
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error_code ec;
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for (ObjectFile::section_iterator i = Obj->begin_sections(),
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e = Obj->end_sections();
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i != e; i.increment(ec)) {
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if (error(ec)) break;
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bool text;
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if (error(i->isText(text))) break;
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if (!text) continue;
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// Make a list of all the symbols in this section.
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std::vector<std::pair<uint64_t, StringRef> > Symbols;
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for (ObjectFile::symbol_iterator si = Obj->begin_symbols(),
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se = Obj->end_symbols();
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si != se; si.increment(ec)) {
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bool contains;
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if (!error(i->containsSymbol(*si, contains)) && contains) {
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uint64_t Address;
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if (error(si->getAddress(Address))) break;
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StringRef Name;
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if (error(si->getName(Name))) break;
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Symbols.push_back(std::make_pair(Address, Name));
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}
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}
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// Sort the symbols by address, just in case they didn't come in that way.
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array_pod_sort(Symbols.begin(), Symbols.end());
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StringRef name;
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if (error(i->getName(name))) break;
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outs() << "Disassembly of section " << name << ':';
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// If the section has no symbols just insert a dummy one and disassemble
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// the whole section.
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if (Symbols.empty())
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Symbols.push_back(std::make_pair(0, name));
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// Set up disassembler.
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OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
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if (!AsmInfo) {
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errs() << "error: no assembly info for target " << TripleName << "\n";
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return;
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}
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OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler());
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if (!DisAsm) {
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errs() << "error: no disassembler for target " << TripleName << "\n";
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return;
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}
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int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
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OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
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AsmPrinterVariant, *AsmInfo));
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if (!IP) {
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errs() << "error: no instruction printer for target " << TripleName << '\n';
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return;
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}
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StringRef Bytes;
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if (error(i->getContents(Bytes))) break;
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StringRefMemoryObject memoryObject(Bytes);
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uint64_t Size;
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uint64_t Index;
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uint64_t SectSize;
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if (error(i->getSize(SectSize))) break;
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// Disassemble symbol by symbol.
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for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {
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uint64_t Start = Symbols[si].first;
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uint64_t End = si == se-1 ? SectSize : Symbols[si + 1].first - 1;
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outs() << '\n' << Symbols[si].second << ":\n";
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#ifndef NDEBUG
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raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
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#else
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raw_ostream &DebugOut = nulls();
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#endif
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for (Index = Start; Index < End; Index += Size) {
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MCInst Inst;
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if (DisAsm->getInstruction(Inst, Size, memoryObject, Index, DebugOut)) {
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uint64_t addr;
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if (error(i->getAddress(addr))) break;
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outs() << format("%8x:\t", addr + Index);
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DumpBytes(StringRef(Bytes.data() + Index, Size));
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IP->printInst(&Inst, outs());
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outs() << "\n";
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} else {
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errs() << ToolName << ": warning: invalid instruction encoding\n";
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if (Size == 0)
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Size = 1; // skip illegible bytes
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}
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}
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if (CFG) {
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MCFunction f =
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MCFunction::createFunctionFromMC(Symbols[si].second, DisAsm.get(),
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memoryObject, Start, End, InstrInfo,
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DebugOut);
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// Start a new dot file.
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std::string Error;
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raw_fd_ostream Out((f.getName().str() + ".dot").c_str(), Error);
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if (!Error.empty()) {
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errs() << ToolName << ": warning: " << Error << '\n';
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continue;
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}
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Out << "digraph " << f.getName() << " {\n";
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Out << "graph [ rankdir = \"LR\" ];\n";
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for (MCFunction::iterator i = f.begin(), e = f.end(); i != e; ++i) {
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bool hasPreds = false;
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// Only print blocks that have predecessors.
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// FIXME: Slow.
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for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
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++pi)
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if (pi->second.contains(&i->second)) {
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hasPreds = true;
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break;
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}
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if (!hasPreds && i != f.begin())
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continue;
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Out << '"' << (uintptr_t)&i->second << "\" [ label=\"<a>";
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// Print instructions.
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for (unsigned ii = 0, ie = i->second.getInsts().size(); ii != ie;
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++ii) {
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// Escape special chars and print the instruction in mnemonic form.
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std::string Str;
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raw_string_ostream OS(Str);
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IP->printInst(&i->second.getInsts()[ii].Inst, OS);
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Out << DOT::EscapeString(OS.str()) << '|';
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}
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Out << "<o>\" shape=\"record\" ];\n";
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// Add edges.
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for (MCBasicBlock::succ_iterator si = i->second.succ_begin(),
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se = i->second.succ_end(); si != se; ++si)
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Out << (uintptr_t)&i->second << ":o -> " << (uintptr_t)*si <<":a\n";
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}
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Out << "}\n";
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}
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}
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}
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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// Initialize targets and assembly printers/parsers.
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llvm::InitializeAllTargetInfos();
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llvm::InitializeAllTargetMCs();
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llvm::InitializeAllAsmParsers();
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llvm::InitializeAllDisassemblers();
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cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
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TripleName = Triple::normalize(TripleName);
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ToolName = argv[0];
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// Defaults to a.out if no filenames specified.
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if (InputFilenames.size() == 0)
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InputFilenames.push_back("a.out");
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// -d is the only flag that is currently implemented, so just print help if
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// it is not set.
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if (!Disassemble) {
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cl::PrintHelpMessage();
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return 2;
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}
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std::for_each(InputFilenames.begin(), InputFilenames.end(),
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DisassembleInput);
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return 0;
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}
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