1 //===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This program is a utility that works like binutils "objdump", that is, it
11 // dumps out a plethora of information about an object file depending on the
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Object/ObjectFile.h"
17 // This config must be included before llvm-config.h.
18 #include "llvm/Config/config.h"
19 #include "../../lib/MC/MCDisassembler/EDDisassembler.h"
20 #include "../../lib/MC/MCDisassembler/EDInst.h"
21 #include "../../lib/MC/MCDisassembler/EDOperand.h"
22 #include "../../lib/MC/MCDisassembler/EDToken.h"
23 #include "llvm/ADT/OwningPtr.h"
24 #include "llvm/ADT/Triple.h"
25 #include "llvm/MC/MCAsmInfo.h"
26 #include "llvm/MC/MCDisassembler.h"
27 #include "llvm/MC/MCInst.h"
28 #include "llvm/MC/MCInstPrinter.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/Support/Debug.h"
31 #include "llvm/Support/Format.h"
32 #include "llvm/Support/Host.h"
33 #include "llvm/Support/ManagedStatic.h"
34 #include "llvm/Support/MemoryBuffer.h"
35 #include "llvm/Support/MemoryObject.h"
36 #include "llvm/Support/PrettyStackTrace.h"
37 #include "llvm/Support/Signals.h"
38 #include "llvm/Support/SourceMgr.h"
39 #include "llvm/Support/raw_ostream.h"
40 #include "llvm/Support/system_error.h"
41 #include "llvm/Target/TargetMachine.h"
42 #include "llvm/Target/TargetRegistry.h"
43 #include "llvm/Target/TargetSelect.h"
49 using namespace object;
53 InputFilenames(cl::Positional, cl::desc("<input object files>"),
57 Disassemble("disassemble",
58 cl::desc("Display assembler mnemonics for the machine instructions"));
60 Disassembled("d", cl::desc("Alias for --disassemble"),
61 cl::aliasopt(Disassemble));
64 TripleName("triple", cl::desc("Target triple to disassemble for, "
65 "see -version for available targets"));
68 ArchName("arch", cl::desc("Target arch to disassemble for, "
69 "see -version for available targets"));
73 bool error(error_code ec) {
74 if (!ec) return false;
76 outs() << ToolName << ": error reading file: " << ec.message() << ".\n";
82 static const Target *GetTarget(const ObjectFile *Obj = NULL) {
83 // Figure out the target triple.
84 llvm::Triple TT("unknown-unknown-unknown");
85 if (TripleName.empty()) {
87 TT.setArch(Triple::ArchType(Obj->getArch()));
89 TT.setTriple(Triple::normalize(TripleName));
91 if (!ArchName.empty())
92 TT.setArchName(ArchName);
94 TripleName = TT.str();
96 // Get the target specific parser.
98 const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
102 errs() << ToolName << ": error: unable to get target for '" << TripleName
103 << "', see --version and --triple.\n";
108 class StringRefMemoryObject : public MemoryObject {
112 StringRefMemoryObject(StringRef bytes) : Bytes(bytes) {}
114 uint64_t getBase() const { return 0; }
115 uint64_t getExtent() const { return Bytes.size(); }
117 int readByte(uint64_t Addr, uint8_t *Byte) const {
118 if (Addr > getExtent())
126 static void DumpBytes(StringRef bytes) {
127 static char hex_rep[] = "0123456789abcdef";
128 // FIXME: The real way to do this is to figure out the longest instruction
129 // and align to that size before printing. I'll fix this when I get
130 // around to outputting relocations.
131 // 15 is the longest x86 instruction
132 // 3 is for the hex rep of a byte + a space.
133 // 1 is for the null terminator.
134 enum { OutputSize = (15 * 3) + 1 };
135 char output[OutputSize];
137 assert(bytes.size() <= 15
138 && "DumpBytes only supports instructions of up to 15 bytes");
139 memset(output, ' ', sizeof(output));
141 for (StringRef::iterator i = bytes.begin(),
142 e = bytes.end(); i != e; ++i) {
143 output[index] = hex_rep[(*i & 0xF0) >> 4];
144 output[index + 1] = hex_rep[*i & 0xF];
148 output[sizeof(output) - 1] = 0;
152 static void DisassembleInput(const StringRef &Filename) {
153 OwningPtr<MemoryBuffer> Buff;
155 if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, Buff)) {
156 errs() << ToolName << ": " << Filename << ": " << ec.message() << "\n";
160 OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
162 const Target *TheTarget = GetTarget(Obj.get());
164 // GetTarget prints out stuff.
170 << ":\tfile format " << Obj->getFileFormatName() << "\n\n\n";
173 for (ObjectFile::section_iterator i = Obj->begin_sections(),
174 e = Obj->end_sections();
175 i != e; i.increment(ec)) {
176 if (error(ec)) break;
178 if (error(i->isText(text))) break;
182 if (error(i->getName(name))) break;
183 outs() << "Disassembly of section " << name << ":\n\n";
185 // Set up disassembler.
186 OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createAsmInfo(TripleName));
189 errs() << "error: no assembly info for target " << TripleName << "\n";
193 OwningPtr<const MCDisassembler> DisAsm(TheTarget->createMCDisassembler());
195 errs() << "error: no disassembler for target " << TripleName << "\n";
199 // FIXME: We shouldn't need to do this (and link in codegen).
200 // When we split this out, we should do it in a way that makes
201 // it straightforward to switch subtargets on the fly (.e.g,
202 // the .cpu and .code16 directives).
203 std::string FeaturesStr;
204 OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName,
207 errs() << "error: could not create target for triple " << TripleName << "\n";
211 int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
212 OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
213 *TM, AsmPrinterVariant, *AsmInfo));
215 errs() << "error: no instruction printer for target " << TripleName << '\n';
220 if (error(i->getContents(Bytes))) break;
221 StringRefMemoryObject memoryObject(Bytes);
225 for (Index = 0; Index < Bytes.size(); Index += Size) {
229 raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
231 raw_ostream &DebugOut = nulls();
234 if (DisAsm->getInstruction(Inst, Size, memoryObject, Index, DebugOut)) {
236 if (error(i->getAddress(addr))) break;
237 outs() << format("%8x:\t", addr + Index);
238 DumpBytes(StringRef(Bytes.data() + Index, Size));
239 IP->printInst(&Inst, outs());
242 errs() << ToolName << ": warning: invalid instruction encoding\n";
244 Size = 1; // skip illegible bytes
250 int main(int argc, char **argv) {
251 // Print a stack trace if we signal out.
252 sys::PrintStackTraceOnErrorSignal();
253 PrettyStackTraceProgram X(argc, argv);
254 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
256 // Initialize targets and assembly printers/parsers.
257 llvm::InitializeAllTargetInfos();
258 // FIXME: We shouldn't need to initialize the Target(Machine)s.
259 llvm::InitializeAllTargets();
260 llvm::InitializeAllAsmPrinters();
261 llvm::InitializeAllAsmParsers();
262 llvm::InitializeAllDisassemblers();
264 cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
265 TripleName = Triple::normalize(TripleName);
269 // Defaults to a.out if no filenames specified.
270 if (InputFilenames.size() == 0)
271 InputFilenames.push_back("a.out");
273 // -d is the only flag that is currently implemented, so just print help if
276 cl::PrintHelpMessage();
280 std::for_each(InputFilenames.begin(), InputFilenames.end(),