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//===- MapFile.cpp --------------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the -Map option. It shows lists in order and
// hierarchically the output sections, input sections, input files and
// symbol:
//
// Address Size Align Out In Symbol
// 00201000 00000015 4 .text
// 00201000 0000000e 4 test.o:(.text)
// 0020100e 00000000 0 local
// 00201005 00000000 0 f(int)
//
//===----------------------------------------------------------------------===//
#include "MapFile.h"
#include "InputFiles.h"
#include "Strings.h"
#include "SymbolTable.h"
#include "Threads.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::object;
using namespace lld;
using namespace lld::elf;
typedef DenseMap<const SectionBase *, SmallVector<DefinedRegular *, 4>>
SymbolMapTy;
// Print out the first three columns of a line.
template <class ELFT>
static void writeHeader(raw_ostream &OS, uint64_t Addr, uint64_t Size,
uint64_t Align) {
int W = ELFT::Is64Bits ? 16 : 8;
OS << format("%0*llx %0*llx %5lld ", W, Addr, W, Size, Align);
}
static std::string indent(int Depth) { return std::string(Depth * 8, ' '); }
// Returns a list of all symbols that we want to print out.
template <class ELFT> std::vector<DefinedRegular *> getSymbols() {
std::vector<DefinedRegular *> V;
for (elf::ObjectFile<ELFT> *File : Symtab<ELFT>::X->getObjectFiles())
for (SymbolBody *B : File->getSymbols())
if (B->File == File && !B->isSection())
if (auto *Sym = dyn_cast<DefinedRegular>(B))
if (Sym->Section)
V.push_back(Sym);
return V;
}
// Returns a map from sections to their symbols.
template <class ELFT>
SymbolMapTy getSectionSyms(ArrayRef<DefinedRegular *> Syms) {
SymbolMapTy Ret;
for (DefinedRegular *S : Syms)
Ret[S->Section].push_back(S);
// Sort symbols by address. We want to print out symbols in the
// order in the output file rather than the order they appeared
// in the input files.
for (auto &It : Ret) {
SmallVectorImpl<DefinedRegular *> &V = It.second;
std::sort(V.begin(), V.end(), [](DefinedRegular *A, DefinedRegular *B) {
return A->getVA() < B->getVA();
});
}
return Ret;
}
// Construct a map from symbols to their stringified representations.
// Demangling symbols (which is what toString() does) is slow, so
// we do that in batch using parallel-for.
template <class ELFT>
DenseMap<DefinedRegular *, std::string>
getSymbolStrings(ArrayRef<DefinedRegular *> Syms) {
std::vector<std::string> Str(Syms.size());
parallelFor(0, Syms.size(), [&](size_t I) {
raw_string_ostream OS(Str[I]);
writeHeader<ELFT>(OS, Syms[I]->getVA(), Syms[I]->template getSize<ELFT>(),
0);
OS << indent(2) << toString(*Syms[I]);
});
DenseMap<DefinedRegular *, std::string> Ret;
for (size_t I = 0, E = Syms.size(); I < E; ++I)
Ret[Syms[I]] = std::move(Str[I]);
return Ret;
}
template <class ELFT>
void elf::writeMapFile(ArrayRef<OutputSection *> OutputSections) {
if (Config->MapFile.empty())
return;
// Open a map file for writing.
std::error_code EC;
raw_fd_ostream OS(Config->MapFile, EC, sys::fs::F_None);
if (EC) {
error("cannot open " + Config->MapFile + ": " + EC.message());
return;
}
// Collect symbol info that we want to print out.
std::vector<DefinedRegular *> Syms = getSymbols<ELFT>();
SymbolMapTy SectionSyms = getSectionSyms<ELFT>(Syms);
DenseMap<DefinedRegular *, std::string> SymStr = getSymbolStrings<ELFT>(Syms);
// Print out the header line.
int W = ELFT::Is64Bits ? 16 : 8;
OS << left_justify("Address", W) << ' ' << left_justify("Size", W)
<< " Align Out In Symbol\n";
// Print out file contents.
for (OutputSection *OSec : OutputSections) {
writeHeader<ELFT>(OS, OSec->Addr, OSec->Size, OSec->Alignment);
OS << OSec->Name << '\n';
// Dump symbols for each input section.
for (InputSection *IS : OSec->Sections) {
writeHeader<ELFT>(OS, OSec->Addr + IS->OutSecOff, IS->getSize(),
IS->Alignment);
OS << indent(1) << toString(IS) << '\n';
for (DefinedRegular *Sym : SectionSyms[IS])
OS << SymStr[Sym] << '\n';
}
}
}
template void elf::writeMapFile<ELF32LE>(ArrayRef<OutputSection *>);
template void elf::writeMapFile<ELF32BE>(ArrayRef<OutputSection *>);
template void elf::writeMapFile<ELF64LE>(ArrayRef<OutputSection *>);
template void elf::writeMapFile<ELF64BE>(ArrayRef<OutputSection *>);
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