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delimited. llvm-mc -disassemble access these through the -mattr option. llvm-objdump -disassemble had no such way to set the attribute so some instructions were just not recognized for disassembly. This patch accepts llvm-mc mechanism for specifying the attributes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162781 91177308-0d34-0410-b5e6-96231b3b80d8
672 lines
22 KiB
C++
672 lines
22 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 "llvm-objdump.h"
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#include "MCFunction.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/COFF.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/StringExtras.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/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/Casting.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/FileSystem.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/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.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 <algorithm>
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#include <cctype>
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#include <cstring>
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using namespace llvm;
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using namespace object;
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static cl::list<std::string>
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InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);
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static 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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static cl::alias
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Disassembled("d", cl::desc("Alias for --disassemble"),
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cl::aliasopt(Disassemble));
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static cl::opt<bool>
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Relocations("r", cl::desc("Display the relocation entries in the file"));
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static cl::opt<bool>
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SectionContents("s", cl::desc("Display the content of each section"));
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static cl::opt<bool>
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SymbolTable("t", cl::desc("Display the symbol table"));
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static cl::opt<bool>
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MachO("macho", cl::desc("Use MachO specific object file parser"));
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static cl::alias
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MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachO));
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cl::opt<std::string>
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llvm::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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llvm::ArchName("arch", cl::desc("Target arch to disassemble for, "
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"see -version for available targets"));
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static cl::opt<bool>
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SectionHeaders("section-headers", cl::desc("Display summaries of the headers "
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"for each section."));
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static cl::alias
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SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
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cl::aliasopt(SectionHeaders));
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static cl::alias
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SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
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cl::aliasopt(SectionHeaders));
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static cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes"),
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cl::value_desc("a1,+a2,-a3,..."));
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static StringRef ToolName;
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static 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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static const Target *getTarget(const ObjectFile *Obj = NULL) {
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// Figure out the target triple.
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llvm::Triple TheTriple("unknown-unknown-unknown");
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if (TripleName.empty()) {
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if (Obj)
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TheTriple.setArch(Triple::ArchType(Obj->getArch()));
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} else
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TheTriple.setTriple(Triple::normalize(TripleName));
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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(ArchName, TheTriple,
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Error);
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if (!TheTarget) {
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errs() << ToolName << ": " << Error;
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return 0;
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}
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// Update the triple name and return the found target.
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TripleName = TheTriple.getTriple();
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return TheTarget;
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}
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void llvm::StringRefMemoryObject::anchor() { }
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void llvm::DumpBytes(StringRef bytes) {
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static const 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 bool RelocAddressLess(RelocationRef a, RelocationRef b) {
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uint64_t a_addr, b_addr;
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if (error(a.getAddress(a_addr))) return false;
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if (error(b.getAddress(b_addr))) return false;
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return a_addr < b_addr;
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}
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static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
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const Target *TheTarget = getTarget(Obj);
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// getTarget() will have already issued a diagnostic if necessary, so
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// just bail here if it failed.
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if (!TheTarget)
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return;
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MAttrs.size()) {
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SubtargetFeatures Features;
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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error_code ec;
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for (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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uint64_t SectionAddr;
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if (error(i->getAddress(SectionAddr))) break;
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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 (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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Address -= SectionAddr;
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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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// Make a list of all the relocations for this section.
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std::vector<RelocationRef> Rels;
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if (InlineRelocs) {
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for (relocation_iterator ri = i->begin_relocations(),
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re = i->end_relocations();
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ri != re; ri.increment(ec)) {
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if (error(ec)) break;
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Rels.push_back(*ri);
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}
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}
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// Sort relocations by address.
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std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
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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 MCSubtargetInfo> STI(
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TheTarget->createMCSubtargetInfo(TripleName, "", FeaturesStr));
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if (!STI) {
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errs() << "error: no subtarget info for target " << TripleName << "\n";
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return;
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}
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OwningPtr<const MCDisassembler> DisAsm(
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TheTarget->createMCDisassembler(*STI));
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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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OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
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if (!MRI) {
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errs() << "error: no register info for target " << TripleName << "\n";
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return;
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}
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OwningPtr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
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if (!MII) {
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errs() << "error: no instruction info 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, *MII, *MRI, *STI));
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if (!IP) {
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errs() << "error: no instruction printer for target " << TripleName
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<< '\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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std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
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std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
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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;
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// The end is either the size of the section or the beginning of the next
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// symbol.
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if (si == se - 1)
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End = SectSize;
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// Make sure this symbol takes up space.
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else if (Symbols[si + 1].first != Start)
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End = Symbols[si + 1].first - 1;
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else
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// This symbol has the same address as the next symbol. Skip it.
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continue;
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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,
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DebugOut, nulls())) {
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outs() << format("%8" PRIx64 ":\t", SectionAddr + 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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// Print relocation for instruction.
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while (rel_cur != rel_end) {
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bool hidden = false;
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uint64_t addr;
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SmallString<16> name;
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SmallString<32> val;
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// If this relocation is hidden, skip it.
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if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
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if (hidden) goto skip_print_rel;
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if (error(rel_cur->getAddress(addr))) goto skip_print_rel;
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// Stop when rel_cur's address is past the current instruction.
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if (addr >= Index + Size) break;
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if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
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if (error(rel_cur->getValueString(val))) goto skip_print_rel;
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outs() << format("\t\t\t%8" PRIx64 ": ", SectionAddr + addr) << name
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<< "\t" << val << "\n";
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skip_print_rel:
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++rel_cur;
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}
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}
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}
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}
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}
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static void PrintRelocations(const ObjectFile *o) {
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error_code ec;
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for (section_iterator si = o->begin_sections(), se = o->end_sections();
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si != se; si.increment(ec)){
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if (error(ec)) return;
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if (si->begin_relocations() == si->end_relocations())
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continue;
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StringRef secname;
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if (error(si->getName(secname))) continue;
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outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
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for (relocation_iterator ri = si->begin_relocations(),
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re = si->end_relocations();
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ri != re; ri.increment(ec)) {
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if (error(ec)) return;
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bool hidden;
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uint64_t address;
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SmallString<32> relocname;
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SmallString<32> valuestr;
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if (error(ri->getHidden(hidden))) continue;
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if (hidden) continue;
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if (error(ri->getTypeName(relocname))) continue;
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if (error(ri->getAddress(address))) continue;
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if (error(ri->getValueString(valuestr))) continue;
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outs() << address << " " << relocname << " " << valuestr << "\n";
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}
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outs() << "\n";
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}
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}
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static void PrintSectionHeaders(const ObjectFile *o) {
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outs() << "Sections:\n"
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"Idx Name Size Address Type\n";
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error_code ec;
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unsigned i = 0;
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for (section_iterator si = o->begin_sections(), se = o->end_sections();
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si != se; si.increment(ec)) {
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if (error(ec)) return;
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StringRef Name;
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if (error(si->getName(Name))) return;
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uint64_t Address;
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if (error(si->getAddress(Address))) return;
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uint64_t Size;
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if (error(si->getSize(Size))) return;
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bool Text, Data, BSS;
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if (error(si->isText(Text))) return;
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if (error(si->isData(Data))) return;
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if (error(si->isBSS(BSS))) return;
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std::string Type = (std::string(Text ? "TEXT " : "") +
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(Data ? "DATA " : "") + (BSS ? "BSS" : ""));
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outs() << format("%3d %-13s %09" PRIx64 " %017" PRIx64 " %s\n",
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i, Name.str().c_str(), Size, Address, Type.c_str());
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++i;
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}
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}
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static void PrintSectionContents(const ObjectFile *o) {
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error_code ec;
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for (section_iterator si = o->begin_sections(),
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se = o->end_sections();
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si != se; si.increment(ec)) {
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if (error(ec)) return;
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StringRef Name;
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StringRef Contents;
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uint64_t BaseAddr;
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if (error(si->getName(Name))) continue;
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if (error(si->getContents(Contents))) continue;
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if (error(si->getAddress(BaseAddr))) continue;
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outs() << "Contents of section " << Name << ":\n";
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// Dump out the content as hex and printable ascii characters.
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for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
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outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
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// Dump line of hex.
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for (std::size_t i = 0; i < 16; ++i) {
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if (i != 0 && i % 4 == 0)
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outs() << ' ';
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if (addr + i < end)
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outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
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<< hexdigit(Contents[addr + i] & 0xF, true);
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else
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outs() << " ";
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}
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// Print ascii.
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outs() << " ";
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for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
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if (std::isprint(Contents[addr + i] & 0xFF))
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outs() << Contents[addr + i];
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else
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outs() << ".";
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}
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outs() << "\n";
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}
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}
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}
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static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
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const coff_file_header *header;
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if (error(coff->getHeader(header))) return;
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int aux_count = 0;
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const coff_symbol *symbol = 0;
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for (int i = 0, e = header->NumberOfSymbols; i != e; ++i) {
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if (aux_count--) {
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// Figure out which type of aux this is.
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if (symbol->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
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&& symbol->Value == 0) { // Section definition.
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const coff_aux_section_definition *asd;
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if (error(coff->getAuxSymbol<coff_aux_section_definition>(i, asd)))
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return;
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outs() << "AUX "
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<< format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
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, unsigned(asd->Length)
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, unsigned(asd->NumberOfRelocations)
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, unsigned(asd->NumberOfLinenumbers)
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, unsigned(asd->CheckSum))
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<< format("assoc %d comdat %d\n"
|
|
, unsigned(asd->Number)
|
|
, unsigned(asd->Selection));
|
|
} else
|
|
outs() << "AUX Unknown\n";
|
|
} else {
|
|
StringRef name;
|
|
if (error(coff->getSymbol(i, symbol))) return;
|
|
if (error(coff->getSymbolName(symbol, name))) return;
|
|
outs() << "[" << format("%2d", i) << "]"
|
|
<< "(sec " << format("%2d", int(symbol->SectionNumber)) << ")"
|
|
<< "(fl 0x00)" // Flag bits, which COFF doesn't have.
|
|
<< "(ty " << format("%3x", unsigned(symbol->Type)) << ")"
|
|
<< "(scl " << format("%3x", unsigned(symbol->StorageClass)) << ") "
|
|
<< "(nx " << unsigned(symbol->NumberOfAuxSymbols) << ") "
|
|
<< "0x" << format("%08x", unsigned(symbol->Value)) << " "
|
|
<< name << "\n";
|
|
aux_count = symbol->NumberOfAuxSymbols;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void PrintSymbolTable(const ObjectFile *o) {
|
|
outs() << "SYMBOL TABLE:\n";
|
|
|
|
if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o))
|
|
PrintCOFFSymbolTable(coff);
|
|
else {
|
|
error_code ec;
|
|
for (symbol_iterator si = o->begin_symbols(),
|
|
se = o->end_symbols(); si != se; si.increment(ec)) {
|
|
if (error(ec)) return;
|
|
StringRef Name;
|
|
uint64_t Address;
|
|
SymbolRef::Type Type;
|
|
uint64_t Size;
|
|
uint32_t Flags;
|
|
section_iterator Section = o->end_sections();
|
|
if (error(si->getName(Name))) continue;
|
|
if (error(si->getAddress(Address))) continue;
|
|
if (error(si->getFlags(Flags))) continue;
|
|
if (error(si->getType(Type))) continue;
|
|
if (error(si->getSize(Size))) continue;
|
|
if (error(si->getSection(Section))) continue;
|
|
|
|
bool Global = Flags & SymbolRef::SF_Global;
|
|
bool Weak = Flags & SymbolRef::SF_Weak;
|
|
bool Absolute = Flags & SymbolRef::SF_Absolute;
|
|
|
|
if (Address == UnknownAddressOrSize)
|
|
Address = 0;
|
|
if (Size == UnknownAddressOrSize)
|
|
Size = 0;
|
|
char GlobLoc = ' ';
|
|
if (Type != SymbolRef::ST_Unknown)
|
|
GlobLoc = Global ? 'g' : 'l';
|
|
char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
|
|
? 'd' : ' ';
|
|
char FileFunc = ' ';
|
|
if (Type == SymbolRef::ST_File)
|
|
FileFunc = 'f';
|
|
else if (Type == SymbolRef::ST_Function)
|
|
FileFunc = 'F';
|
|
|
|
outs() << format("%08" PRIx64, Address) << " "
|
|
<< GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
|
|
<< (Weak ? 'w' : ' ') // Weak?
|
|
<< ' ' // Constructor. Not supported yet.
|
|
<< ' ' // Warning. Not supported yet.
|
|
<< ' ' // Indirect reference to another symbol.
|
|
<< Debug // Debugging (d) or dynamic (D) symbol.
|
|
<< FileFunc // Name of function (F), file (f) or object (O).
|
|
<< ' ';
|
|
if (Absolute)
|
|
outs() << "*ABS*";
|
|
else if (Section == o->end_sections())
|
|
outs() << "*UND*";
|
|
else {
|
|
StringRef SectionName;
|
|
if (error(Section->getName(SectionName)))
|
|
SectionName = "";
|
|
outs() << SectionName;
|
|
}
|
|
outs() << '\t'
|
|
<< format("%08" PRIx64 " ", Size)
|
|
<< Name
|
|
<< '\n';
|
|
}
|
|
}
|
|
}
|
|
|
|
static void DumpObject(const ObjectFile *o) {
|
|
outs() << '\n';
|
|
outs() << o->getFileName()
|
|
<< ":\tfile format " << o->getFileFormatName() << "\n\n";
|
|
|
|
if (Disassemble)
|
|
DisassembleObject(o, Relocations);
|
|
if (Relocations && !Disassemble)
|
|
PrintRelocations(o);
|
|
if (SectionHeaders)
|
|
PrintSectionHeaders(o);
|
|
if (SectionContents)
|
|
PrintSectionContents(o);
|
|
if (SymbolTable)
|
|
PrintSymbolTable(o);
|
|
}
|
|
|
|
/// @brief Dump each object file in \a a;
|
|
static void DumpArchive(const Archive *a) {
|
|
for (Archive::child_iterator i = a->begin_children(),
|
|
e = a->end_children(); i != e; ++i) {
|
|
OwningPtr<Binary> child;
|
|
if (error_code ec = i->getAsBinary(child)) {
|
|
// Ignore non-object files.
|
|
if (ec != object_error::invalid_file_type)
|
|
errs() << ToolName << ": '" << a->getFileName() << "': " << ec.message()
|
|
<< ".\n";
|
|
continue;
|
|
}
|
|
if (ObjectFile *o = dyn_cast<ObjectFile>(child.get()))
|
|
DumpObject(o);
|
|
else
|
|
errs() << ToolName << ": '" << a->getFileName() << "': "
|
|
<< "Unrecognized file type.\n";
|
|
}
|
|
}
|
|
|
|
/// @brief Open file and figure out how to dump it.
|
|
static void DumpInput(StringRef file) {
|
|
// If file isn't stdin, check that it exists.
|
|
if (file != "-" && !sys::fs::exists(file)) {
|
|
errs() << ToolName << ": '" << file << "': " << "No such file\n";
|
|
return;
|
|
}
|
|
|
|
if (MachO && Disassemble) {
|
|
DisassembleInputMachO(file);
|
|
return;
|
|
}
|
|
|
|
// Attempt to open the binary.
|
|
OwningPtr<Binary> binary;
|
|
if (error_code ec = createBinary(file, binary)) {
|
|
errs() << ToolName << ": '" << file << "': " << ec.message() << ".\n";
|
|
return;
|
|
}
|
|
|
|
if (Archive *a = dyn_cast<Archive>(binary.get()))
|
|
DumpArchive(a);
|
|
else if (ObjectFile *o = dyn_cast<ObjectFile>(binary.get()))
|
|
DumpObject(o);
|
|
else
|
|
errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
|
|
}
|
|
|
|
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();
|
|
llvm::InitializeAllTargetMCs();
|
|
llvm::InitializeAllAsmParsers();
|
|
llvm::InitializeAllDisassemblers();
|
|
|
|
// Register the target printer for --version.
|
|
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
|
|
|
|
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");
|
|
|
|
if (!Disassemble
|
|
&& !Relocations
|
|
&& !SectionHeaders
|
|
&& !SectionContents
|
|
&& !SymbolTable) {
|
|
cl::PrintHelpMessage();
|
|
return 2;
|
|
}
|
|
|
|
std::for_each(InputFilenames.begin(), InputFilenames.end(),
|
|
DumpInput);
|
|
|
|
return 0;
|
|
}
|