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//===- LLDMapFile.cpp -----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the /lldmap option. It shows lists in order and
// hierarchically the output sections, input sections, input files and
// symbol:
//
// Address Size Align Out File Symbol
// 00201000 00000015 4 .text
// 00201000 0000000e 4 test.o:(.text)
// 0020100e 00000000 0 local
// 00201005 00000000 0 f(int)
//
//===----------------------------------------------------------------------===//
#include "LLDMapFile.h"
#include "COFFLinkerContext.h"
#include "SymbolTable.h"
#include "Symbols.h"
#include "Writer.h"
#include "lld/Common/ErrorHandler.h"
#include "llvm/Support/Parallel.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::object;
using namespace lld;
using namespace lld::coff;
using SymbolMapTy =
DenseMap<const SectionChunk *, SmallVector<DefinedRegular *, 4>>;
static constexpr char indent8[] = " "; // 8 spaces
static constexpr char indent16[] = " "; // 16 spaces
// Print out the first three columns of a line.
static void writeHeader(raw_ostream &os, uint64_t addr, uint64_t size,
uint64_t align) {
os << format("%08llx %08llx %5lld ", addr, size, align);
}
// Returns a list of all symbols that we want to print out.
static std::vector<DefinedRegular *> getSymbols(const COFFLinkerContext &ctx) {
std::vector<DefinedRegular *> v;
for (ObjFile *file : ctx.objFileInstances)
for (Symbol *b : file->getSymbols())
if (auto *sym = dyn_cast_or_null<DefinedRegular>(b))
if (sym && !sym->getCOFFSymbol().isSectionDefinition())
v.push_back(sym);
return v;
}
// Returns a map from sections to their symbols.
static SymbolMapTy getSectionSyms(ArrayRef<DefinedRegular *> syms) {
SymbolMapTy ret;
for (DefinedRegular *s : syms)
ret[s->getChunk()].push_back(s);
// Sort symbols by address.
for (auto &it : ret) {
SmallVectorImpl<DefinedRegular *> &v = it.second;
std::stable_sort(v.begin(), v.end(), [](DefinedRegular *a, DefinedRegular *b) {
return a->getRVA() < b->getRVA();
});
}
return ret;
}
// Construct a map from symbols to their stringified representations.
static DenseMap<DefinedRegular *, std::string>
getSymbolStrings(ArrayRef<DefinedRegular *> syms) {
std::vector<std::string> str(syms.size());
parallelForEachN((size_t)0, syms.size(), [&](size_t i) {
raw_string_ostream os(str[i]);
writeHeader(os, syms[i]->getRVA(), 0, 0);
os << indent16 << 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;
}
void lld::coff::writeLLDMapFile(const COFFLinkerContext &ctx) {
if (config->lldmapFile.empty())
return;
std::error_code ec;
raw_fd_ostream os(config->lldmapFile, ec, sys::fs::OF_None);
if (ec)
fatal("cannot open " + config->lldmapFile + ": " + ec.message());
// Collect symbol info that we want to print out.
std::vector<DefinedRegular *> syms = getSymbols(ctx);
SymbolMapTy sectionSyms = getSectionSyms(syms);
DenseMap<DefinedRegular *, std::string> symStr = getSymbolStrings(syms);
// Print out the header line.
os << "Address Size Align Out In Symbol\n";
// Print out file contents.
for (OutputSection *sec : ctx.outputSections) {
writeHeader(os, sec->getRVA(), sec->getVirtualSize(), /*align=*/pageSize);
os << sec->name << '\n';
for (Chunk *c : sec->chunks) {
auto *sc = dyn_cast<SectionChunk>(c);
if (!sc)
continue;
writeHeader(os, sc->getRVA(), sc->getSize(), sc->getAlignment());
os << indent8 << sc->file->getName() << ":(" << sc->getSectionName()
<< ")\n";
for (DefinedRegular *sym : sectionSyms[sc])
os << symStr[sym] << '\n';
}
}
}
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