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https://github.com/c64scene-ar/llvm-6502.git
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The current state of affairs has auxiliary symbols described as a big bag of bytes. This is less than satisfying, it detracts from the YAML file as being human readable. Instead, allow for symbols to optionally contain their auxiliary data. This allows us to have a much higher level way of describing things like weak symbols, function definitions and section definitions. This depends on D3105. Differential Revision: http://llvm-reviews.chandlerc.com/D3092 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204214 91177308-0d34-0410-b5e6-96231b3b80d8
628 lines
20 KiB
C++
628 lines
20 KiB
C++
//===-- llvm-nm.cpp - Symbol table 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 traditional Unix "nm", that is, it
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// prints out the names of symbols in a bitcode or object file, along with some
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// information about each symbol.
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//
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// This "nm" supports many of the features of GNU "nm", including its different
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// output formats.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/LLVMContext.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/ELFObjectFile.h"
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#include "llvm/Object/IRObjectFile.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/COFF.h"
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#include "llvm/Support/CommandLine.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/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/Signals.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 <cerrno>
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#include <cstring>
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#include <vector>
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using namespace llvm;
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using namespace object;
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namespace {
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enum OutputFormatTy { bsd, sysv, posix };
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cl::opt<OutputFormatTy> OutputFormat(
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"format", cl::desc("Specify output format"),
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cl::values(clEnumVal(bsd, "BSD format"), clEnumVal(sysv, "System V format"),
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clEnumVal(posix, "POSIX.2 format"), clEnumValEnd),
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cl::init(bsd));
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cl::alias OutputFormat2("f", cl::desc("Alias for --format"),
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cl::aliasopt(OutputFormat));
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cl::list<std::string> InputFilenames(cl::Positional, cl::desc("<input files>"),
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cl::ZeroOrMore);
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cl::opt<bool> UndefinedOnly("undefined-only",
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cl::desc("Show only undefined symbols"));
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cl::alias UndefinedOnly2("u", cl::desc("Alias for --undefined-only"),
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cl::aliasopt(UndefinedOnly));
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cl::opt<bool> DynamicSyms("dynamic",
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cl::desc("Display the dynamic symbols instead "
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"of normal symbols."));
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cl::alias DynamicSyms2("D", cl::desc("Alias for --dynamic"),
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cl::aliasopt(DynamicSyms));
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cl::opt<bool> DefinedOnly("defined-only",
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cl::desc("Show only defined symbols"));
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cl::opt<bool> ExternalOnly("extern-only",
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cl::desc("Show only external symbols"));
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cl::alias ExternalOnly2("g", cl::desc("Alias for --extern-only"),
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cl::aliasopt(ExternalOnly));
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cl::opt<bool> BSDFormat("B", cl::desc("Alias for --format=bsd"));
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cl::opt<bool> POSIXFormat("P", cl::desc("Alias for --format=posix"));
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cl::opt<bool> PrintFileName(
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"print-file-name",
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cl::desc("Precede each symbol with the object file it came from"));
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cl::alias PrintFileNameA("A", cl::desc("Alias for --print-file-name"),
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cl::aliasopt(PrintFileName));
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cl::alias PrintFileNameo("o", cl::desc("Alias for --print-file-name"),
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cl::aliasopt(PrintFileName));
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cl::opt<bool> DebugSyms("debug-syms",
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cl::desc("Show all symbols, even debugger only"));
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cl::alias DebugSymsa("a", cl::desc("Alias for --debug-syms"),
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cl::aliasopt(DebugSyms));
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cl::opt<bool> NumericSort("numeric-sort", cl::desc("Sort symbols by address"));
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cl::alias NumericSortn("n", cl::desc("Alias for --numeric-sort"),
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cl::aliasopt(NumericSort));
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cl::alias NumericSortv("v", cl::desc("Alias for --numeric-sort"),
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cl::aliasopt(NumericSort));
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cl::opt<bool> NoSort("no-sort", cl::desc("Show symbols in order encountered"));
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cl::alias NoSortp("p", cl::desc("Alias for --no-sort"), cl::aliasopt(NoSort));
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cl::opt<bool> PrintSize("print-size",
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cl::desc("Show symbol size instead of address"));
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cl::alias PrintSizeS("S", cl::desc("Alias for --print-size"),
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cl::aliasopt(PrintSize));
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cl::opt<bool> SizeSort("size-sort", cl::desc("Sort symbols by size"));
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cl::opt<bool> WithoutAliases("without-aliases", cl::Hidden,
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cl::desc("Exclude aliases from output"));
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cl::opt<bool> ArchiveMap("print-armap", cl::desc("Print the archive map"));
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cl::alias ArchiveMaps("s", cl::desc("Alias for --print-armap"),
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cl::aliasopt(ArchiveMap));
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bool PrintAddress = true;
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bool MultipleFiles = false;
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bool HadError = false;
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std::string ToolName;
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}
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static void error(Twine Message, Twine Path = Twine()) {
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HadError = true;
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errs() << ToolName << ": " << Path << ": " << Message << ".\n";
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}
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static bool error(error_code EC, Twine Path = Twine()) {
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if (EC) {
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error(EC.message(), Path);
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return true;
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}
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return false;
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}
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namespace {
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struct NMSymbol {
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uint64_t Address;
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uint64_t Size;
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char TypeChar;
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StringRef Name;
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};
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}
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static bool compareSymbolAddress(const NMSymbol &A, const NMSymbol &B) {
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if (A.Address < B.Address)
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return true;
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else if (A.Address == B.Address && A.Name < B.Name)
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return true;
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else if (A.Address == B.Address && A.Name == B.Name && A.Size < B.Size)
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return true;
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else
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return false;
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}
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static bool compareSymbolSize(const NMSymbol &A, const NMSymbol &B) {
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if (A.Size < B.Size)
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return true;
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else if (A.Size == B.Size && A.Name < B.Name)
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return true;
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else if (A.Size == B.Size && A.Name == B.Name && A.Address < B.Address)
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return true;
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else
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return false;
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}
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static bool compareSymbolName(const NMSymbol &A, const NMSymbol &B) {
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if (A.Name < B.Name)
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return true;
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else if (A.Name == B.Name && A.Size < B.Size)
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return true;
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else if (A.Name == B.Name && A.Size == B.Size && A.Address < B.Address)
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return true;
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else
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return false;
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}
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static StringRef CurrentFilename;
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typedef std::vector<NMSymbol> SymbolListT;
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static SymbolListT SymbolList;
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static void sortAndPrintSymbolList() {
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if (!NoSort) {
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if (NumericSort)
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std::sort(SymbolList.begin(), SymbolList.end(), compareSymbolAddress);
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else if (SizeSort)
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std::sort(SymbolList.begin(), SymbolList.end(), compareSymbolSize);
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else
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std::sort(SymbolList.begin(), SymbolList.end(), compareSymbolName);
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}
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if (OutputFormat == posix && MultipleFiles) {
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outs() << '\n' << CurrentFilename << ":\n";
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} else if (OutputFormat == bsd && MultipleFiles) {
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outs() << "\n" << CurrentFilename << ":\n";
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} else if (OutputFormat == sysv) {
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outs() << "\n\nSymbols from " << CurrentFilename << ":\n\n"
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<< "Name Value Class Type"
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<< " Size Line Section\n";
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}
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for (SymbolListT::iterator I = SymbolList.begin(), E = SymbolList.end();
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I != E; ++I) {
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if ((I->TypeChar != 'U') && UndefinedOnly)
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continue;
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if ((I->TypeChar == 'U') && DefinedOnly)
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continue;
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if (SizeSort && !PrintAddress && I->Size == UnknownAddressOrSize)
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continue;
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char SymbolAddrStr[10] = "";
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char SymbolSizeStr[10] = "";
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if (OutputFormat == sysv || I->Address == UnknownAddressOrSize)
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strcpy(SymbolAddrStr, " ");
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if (OutputFormat == sysv)
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strcpy(SymbolSizeStr, " ");
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if (I->Address != UnknownAddressOrSize)
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format("%08" PRIx64, I->Address)
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.print(SymbolAddrStr, sizeof(SymbolAddrStr));
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if (I->Size != UnknownAddressOrSize)
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format("%08" PRIx64, I->Size).print(SymbolSizeStr, sizeof(SymbolSizeStr));
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if (OutputFormat == posix) {
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outs() << I->Name << " " << I->TypeChar << " " << SymbolAddrStr
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<< SymbolSizeStr << "\n";
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} else if (OutputFormat == bsd) {
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if (PrintAddress)
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outs() << SymbolAddrStr << ' ';
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if (PrintSize) {
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outs() << SymbolSizeStr;
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if (I->Size != UnknownAddressOrSize)
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outs() << ' ';
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}
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outs() << I->TypeChar << " " << I->Name << "\n";
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} else if (OutputFormat == sysv) {
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std::string PaddedName(I->Name);
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while (PaddedName.length() < 20)
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PaddedName += " ";
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outs() << PaddedName << "|" << SymbolAddrStr << "| " << I->TypeChar
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<< " | |" << SymbolSizeStr << "| |\n";
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}
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}
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SymbolList.clear();
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}
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template <class ELFT>
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static char getSymbolNMTypeChar(ELFObjectFile<ELFT> &Obj,
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basic_symbol_iterator I) {
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typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
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typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
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// OK, this is ELF
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symbol_iterator SymI(I);
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DataRefImpl Symb = I->getRawDataRefImpl();
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const Elf_Sym *ESym = Obj.getSymbol(Symb);
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const ELFFile<ELFT> &EF = *Obj.getELFFile();
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const Elf_Shdr *ESec = EF.getSection(ESym);
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if (ESec) {
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switch (ESec->sh_type) {
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case ELF::SHT_PROGBITS:
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case ELF::SHT_DYNAMIC:
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switch (ESec->sh_flags) {
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case(ELF::SHF_ALLOC | ELF::SHF_EXECINSTR) :
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return 't';
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case(ELF::SHF_TLS | ELF::SHF_ALLOC | ELF::SHF_WRITE) :
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case(ELF::SHF_ALLOC | ELF::SHF_WRITE) :
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return 'd';
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case ELF::SHF_ALLOC:
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case(ELF::SHF_ALLOC | ELF::SHF_MERGE) :
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case(ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS) :
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return 'r';
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}
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break;
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case ELF::SHT_NOBITS:
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return 'b';
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}
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}
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if (ESym->getType() == ELF::STT_SECTION) {
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StringRef Name;
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if (error(SymI->getName(Name)))
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return '?';
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return StringSwitch<char>(Name)
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.StartsWith(".debug", 'N')
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.StartsWith(".note", 'n')
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.Default('?');
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}
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return '?';
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}
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static char getSymbolNMTypeChar(COFFObjectFile &Obj, symbol_iterator I) {
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const coff_symbol *Symb = Obj.getCOFFSymbol(*I);
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// OK, this is COFF.
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symbol_iterator SymI(I);
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StringRef Name;
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if (error(SymI->getName(Name)))
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return '?';
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char Ret = StringSwitch<char>(Name)
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.StartsWith(".debug", 'N')
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.StartsWith(".sxdata", 'N')
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.Default('?');
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if (Ret != '?')
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return Ret;
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uint32_t Characteristics = 0;
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if (!COFF::isReservedSectionNumber(Symb->SectionNumber)) {
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section_iterator SecI = Obj.section_end();
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if (error(SymI->getSection(SecI)))
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return '?';
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const coff_section *Section = Obj.getCOFFSection(*SecI);
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Characteristics = Section->Characteristics;
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}
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switch (Symb->SectionNumber) {
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case COFF::IMAGE_SYM_DEBUG:
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return 'n';
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default:
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// Check section type.
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if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
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return 't';
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else if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
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~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
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return 'r';
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else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
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return 'd';
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else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
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return 'b';
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else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
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return 'i';
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// Check for section symbol.
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else if (Symb->isSectionDefinition())
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return 's';
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}
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return '?';
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}
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static uint8_t getNType(MachOObjectFile &Obj, DataRefImpl Symb) {
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if (Obj.is64Bit()) {
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MachO::nlist_64 STE = Obj.getSymbol64TableEntry(Symb);
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return STE.n_type;
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}
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MachO::nlist STE = Obj.getSymbolTableEntry(Symb);
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return STE.n_type;
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}
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static char getSymbolNMTypeChar(MachOObjectFile &Obj, basic_symbol_iterator I) {
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DataRefImpl Symb = I->getRawDataRefImpl();
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uint8_t NType = getNType(Obj, Symb);
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switch (NType & MachO::N_TYPE) {
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case MachO::N_ABS:
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return 's';
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case MachO::N_SECT: {
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section_iterator Sec = Obj.section_end();
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Obj.getSymbolSection(Symb, Sec);
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DataRefImpl Ref = Sec->getRawDataRefImpl();
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StringRef SectionName;
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Obj.getSectionName(Ref, SectionName);
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StringRef SegmentName = Obj.getSectionFinalSegmentName(Ref);
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if (SegmentName == "__TEXT" && SectionName == "__text")
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return 't';
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else
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return 's';
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}
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}
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return '?';
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}
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static char getSymbolNMTypeChar(const GlobalValue &GV) {
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if (isa<Function>(GV))
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return 't';
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// FIXME: should we print 'b'? At the IR level we cannot be sure if this
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// will be in bss or not, but we could approximate.
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if (isa<GlobalVariable>(GV))
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return 'd';
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const GlobalAlias *GA = cast<GlobalAlias>(&GV);
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const GlobalValue *AliasedGV = GA->getAliasedGlobal();
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return getSymbolNMTypeChar(*AliasedGV);
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}
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static char getSymbolNMTypeChar(IRObjectFile &Obj, basic_symbol_iterator I) {
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const GlobalValue &GV = Obj.getSymbolGV(I->getRawDataRefImpl());
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return getSymbolNMTypeChar(GV);
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}
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template <class ELFT>
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static bool isObject(ELFObjectFile<ELFT> &Obj, symbol_iterator I) {
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typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
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DataRefImpl Symb = I->getRawDataRefImpl();
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const Elf_Sym *ESym = Obj.getSymbol(Symb);
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return ESym->getType() == ELF::STT_OBJECT;
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}
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static bool isObject(SymbolicFile *Obj, basic_symbol_iterator I) {
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if (ELF32LEObjectFile *ELF = dyn_cast<ELF32LEObjectFile>(Obj))
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return isObject(*ELF, I);
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if (ELF64LEObjectFile *ELF = dyn_cast<ELF64LEObjectFile>(Obj))
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return isObject(*ELF, I);
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if (ELF32BEObjectFile *ELF = dyn_cast<ELF32BEObjectFile>(Obj))
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return isObject(*ELF, I);
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if (ELF64BEObjectFile *ELF = dyn_cast<ELF64BEObjectFile>(Obj))
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return isObject(*ELF, I);
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return false;
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}
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static char getNMTypeChar(SymbolicFile *Obj, basic_symbol_iterator I) {
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uint32_t Symflags = I->getFlags();
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if ((Symflags & object::SymbolRef::SF_Weak) && !isa<MachOObjectFile>(Obj)) {
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char Ret = isObject(Obj, I) ? 'v' : 'w';
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if (!(Symflags & object::SymbolRef::SF_Undefined))
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Ret = toupper(Ret);
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return Ret;
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}
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if (Symflags & object::SymbolRef::SF_Undefined)
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return 'U';
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if (Symflags & object::SymbolRef::SF_Common)
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return 'C';
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char Ret = '?';
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if (Symflags & object::SymbolRef::SF_Absolute)
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Ret = 'a';
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else if (IRObjectFile *IR = dyn_cast<IRObjectFile>(Obj))
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Ret = getSymbolNMTypeChar(*IR, I);
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else if (COFFObjectFile *COFF = dyn_cast<COFFObjectFile>(Obj))
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Ret = getSymbolNMTypeChar(*COFF, I);
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else if (MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(Obj))
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Ret = getSymbolNMTypeChar(*MachO, I);
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else if (ELF32LEObjectFile *ELF = dyn_cast<ELF32LEObjectFile>(Obj))
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Ret = getSymbolNMTypeChar(*ELF, I);
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else if (ELF64LEObjectFile *ELF = dyn_cast<ELF64LEObjectFile>(Obj))
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Ret = getSymbolNMTypeChar(*ELF, I);
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else if (ELF32BEObjectFile *ELF = dyn_cast<ELF32BEObjectFile>(Obj))
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Ret = getSymbolNMTypeChar(*ELF, I);
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else
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Ret = getSymbolNMTypeChar(*cast<ELF64BEObjectFile>(Obj), I);
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if (Symflags & object::SymbolRef::SF_Global)
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Ret = toupper(Ret);
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return Ret;
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}
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static void dumpSymbolNamesFromObject(SymbolicFile *Obj) {
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basic_symbol_iterator IBegin = Obj->symbol_begin();
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basic_symbol_iterator IEnd = Obj->symbol_end();
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if (DynamicSyms) {
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if (!Obj->isELF()) {
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error("File format has no dynamic symbol table", Obj->getFileName());
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|
return;
|
|
}
|
|
std::pair<symbol_iterator, symbol_iterator> IDyn =
|
|
getELFDynamicSymbolIterators(Obj);
|
|
IBegin = IDyn.first;
|
|
IEnd = IDyn.second;
|
|
}
|
|
std::string NameBuffer;
|
|
raw_string_ostream OS(NameBuffer);
|
|
for (basic_symbol_iterator I = IBegin; I != IEnd; ++I) {
|
|
uint32_t SymFlags = I->getFlags();
|
|
if (!DebugSyms && (SymFlags & SymbolRef::SF_FormatSpecific))
|
|
continue;
|
|
if (WithoutAliases) {
|
|
if (IRObjectFile *IR = dyn_cast<IRObjectFile>(Obj)) {
|
|
const GlobalValue &GV = IR->getSymbolGV(I->getRawDataRefImpl());
|
|
if(isa<GlobalAlias>(GV))
|
|
continue;
|
|
}
|
|
}
|
|
NMSymbol S;
|
|
S.Size = UnknownAddressOrSize;
|
|
S.Address = UnknownAddressOrSize;
|
|
if ((PrintSize || SizeSort) && isa<ObjectFile>(Obj)) {
|
|
symbol_iterator SymI = I;
|
|
if (error(SymI->getSize(S.Size)))
|
|
break;
|
|
}
|
|
if (PrintAddress && isa<ObjectFile>(Obj))
|
|
if (error(symbol_iterator(I)->getAddress(S.Address)))
|
|
break;
|
|
S.TypeChar = getNMTypeChar(Obj, I);
|
|
if (error(I->printName(OS)))
|
|
break;
|
|
OS << '\0';
|
|
SymbolList.push_back(S);
|
|
}
|
|
|
|
OS.flush();
|
|
const char *P = NameBuffer.c_str();
|
|
for (unsigned I = 0; I < SymbolList.size(); ++I) {
|
|
SymbolList[I].Name = P;
|
|
P += strlen(P) + 1;
|
|
}
|
|
|
|
CurrentFilename = Obj->getFileName();
|
|
sortAndPrintSymbolList();
|
|
}
|
|
|
|
static void dumpSymbolNamesFromFile(std::string &Filename) {
|
|
std::unique_ptr<MemoryBuffer> Buffer;
|
|
if (error(MemoryBuffer::getFileOrSTDIN(Filename, Buffer), Filename))
|
|
return;
|
|
|
|
LLVMContext &Context = getGlobalContext();
|
|
ErrorOr<Binary *> BinaryOrErr = createBinary(Buffer.release(), &Context);
|
|
if (error(BinaryOrErr.getError(), Filename))
|
|
return;
|
|
std::unique_ptr<Binary> Bin(BinaryOrErr.get());
|
|
|
|
if (Archive *A = dyn_cast<Archive>(Bin.get())) {
|
|
if (ArchiveMap) {
|
|
Archive::symbol_iterator I = A->symbol_begin();
|
|
Archive::symbol_iterator E = A->symbol_end();
|
|
if (I != E) {
|
|
outs() << "Archive map\n";
|
|
for (; I != E; ++I) {
|
|
Archive::child_iterator C;
|
|
StringRef SymName;
|
|
StringRef FileName;
|
|
if (error(I->getMember(C)))
|
|
return;
|
|
if (error(I->getName(SymName)))
|
|
return;
|
|
if (error(C->getName(FileName)))
|
|
return;
|
|
outs() << SymName << " in " << FileName << "\n";
|
|
}
|
|
outs() << "\n";
|
|
}
|
|
}
|
|
|
|
for (Archive::child_iterator I = A->child_begin(), E = A->child_end();
|
|
I != E; ++I) {
|
|
std::unique_ptr<Binary> Child;
|
|
if (I->getAsBinary(Child, &Context))
|
|
continue;
|
|
if (SymbolicFile *O = dyn_cast<SymbolicFile>(Child.get())) {
|
|
outs() << O->getFileName() << ":\n";
|
|
dumpSymbolNamesFromObject(O);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(Bin.get())) {
|
|
for (MachOUniversalBinary::object_iterator I = UB->begin_objects(),
|
|
E = UB->end_objects();
|
|
I != E; ++I) {
|
|
std::unique_ptr<ObjectFile> Obj;
|
|
if (!I->getAsObjectFile(Obj)) {
|
|
outs() << Obj->getFileName() << ":\n";
|
|
dumpSymbolNamesFromObject(Obj.get());
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
if (SymbolicFile *O = dyn_cast<SymbolicFile>(Bin.get())) {
|
|
dumpSymbolNamesFromObject(O);
|
|
return;
|
|
}
|
|
error("unrecognizable file type", Filename);
|
|
return;
|
|
}
|
|
|
|
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.
|
|
cl::ParseCommandLineOptions(argc, argv, "llvm symbol table dumper\n");
|
|
|
|
// llvm-nm only reads binary files.
|
|
if (error(sys::ChangeStdinToBinary()))
|
|
return 1;
|
|
|
|
ToolName = argv[0];
|
|
if (BSDFormat)
|
|
OutputFormat = bsd;
|
|
if (POSIXFormat)
|
|
OutputFormat = posix;
|
|
|
|
// The relative order of these is important. If you pass --size-sort it should
|
|
// only print out the size. However, if you pass -S --size-sort, it should
|
|
// print out both the size and address.
|
|
if (SizeSort && !PrintSize)
|
|
PrintAddress = false;
|
|
if (OutputFormat == sysv || SizeSort)
|
|
PrintSize = true;
|
|
|
|
switch (InputFilenames.size()) {
|
|
case 0:
|
|
InputFilenames.push_back("-");
|
|
case 1:
|
|
break;
|
|
default:
|
|
MultipleFiles = true;
|
|
}
|
|
|
|
std::for_each(InputFilenames.begin(), InputFilenames.end(),
|
|
dumpSymbolNamesFromFile);
|
|
|
|
if (HadError)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|