1 //===- LLDMapFile.cpp -----------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the /lldmap option. It shows lists in order and
10 // hierarchically the output sections, input sections, input files and
11 // symbol:
12 //
13 // Address Size Align Out File Symbol
14 // 00201000 00000015 4 .text
15 // 00201000 0000000e 4 test.o:(.text)
16 // 0020100e 00000000 0 local
17 // 00201005 00000000 0 f(int)
18 //
19 //===----------------------------------------------------------------------===//
20
21 #include "LLDMapFile.h"
22 #include "COFFLinkerContext.h"
23 #include "SymbolTable.h"
24 #include "Symbols.h"
25 #include "Writer.h"
26 #include "lld/Common/ErrorHandler.h"
27 #include "llvm/Support/Parallel.h"
28 #include "llvm/Support/TimeProfiler.h"
29 #include "llvm/Support/raw_ostream.h"
30
31 using namespace llvm;
32 using namespace llvm::object;
33 using namespace lld;
34 using namespace lld::coff;
35
36 using SymbolMapTy =
37 DenseMap<const SectionChunk *, SmallVector<DefinedRegular *, 4>>;
38
39 static constexpr char indent8[] = " "; // 8 spaces
40 static constexpr char indent16[] = " "; // 16 spaces
41
42 // Print out the first three columns of a line.
writeHeader(raw_ostream & os,uint64_t addr,uint64_t size,uint64_t align)43 static void writeHeader(raw_ostream &os, uint64_t addr, uint64_t size,
44 uint64_t align) {
45 os << format("%08llx %08llx %5lld ", addr, size, align);
46 }
47
48 // Returns a list of all symbols that we want to print out.
getSymbols(const COFFLinkerContext & ctx)49 static std::vector<DefinedRegular *> getSymbols(const COFFLinkerContext &ctx) {
50 std::vector<DefinedRegular *> v;
51 for (ObjFile *file : ctx.objFileInstances)
52 for (Symbol *b : file->getSymbols())
53 if (auto *sym = dyn_cast_or_null<DefinedRegular>(b))
54 if (sym && !sym->getCOFFSymbol().isSectionDefinition())
55 v.push_back(sym);
56 return v;
57 }
58
59 // Returns a map from sections to their symbols.
getSectionSyms(ArrayRef<DefinedRegular * > syms)60 static SymbolMapTy getSectionSyms(ArrayRef<DefinedRegular *> syms) {
61 SymbolMapTy ret;
62 for (DefinedRegular *s : syms)
63 ret[s->getChunk()].push_back(s);
64
65 // Sort symbols by address.
66 for (auto &it : ret) {
67 SmallVectorImpl<DefinedRegular *> &v = it.second;
68 std::stable_sort(v.begin(), v.end(), [](DefinedRegular *a, DefinedRegular *b) {
69 return a->getRVA() < b->getRVA();
70 });
71 }
72 return ret;
73 }
74
75 // Construct a map from symbols to their stringified representations.
76 static DenseMap<DefinedRegular *, std::string>
getSymbolStrings(const COFFLinkerContext & ctx,ArrayRef<DefinedRegular * > syms)77 getSymbolStrings(const COFFLinkerContext &ctx,
78 ArrayRef<DefinedRegular *> syms) {
79 std::vector<std::string> str(syms.size());
80 parallelFor((size_t)0, syms.size(), [&](size_t i) {
81 raw_string_ostream os(str[i]);
82 writeHeader(os, syms[i]->getRVA(), 0, 0);
83 os << indent16 << toString(ctx, *syms[i]);
84 });
85
86 DenseMap<DefinedRegular *, std::string> ret;
87 for (size_t i = 0, e = syms.size(); i < e; ++i)
88 ret[syms[i]] = std::move(str[i]);
89 return ret;
90 }
91
writeLLDMapFile(const COFFLinkerContext & ctx)92 void lld::coff::writeLLDMapFile(const COFFLinkerContext &ctx) {
93 if (ctx.config.lldmapFile.empty())
94 return;
95
96 llvm::TimeTraceScope timeScope(".lldmap file");
97 std::error_code ec;
98 raw_fd_ostream os(ctx.config.lldmapFile, ec, sys::fs::OF_None);
99 if (ec)
100 fatal("cannot open " + ctx.config.lldmapFile + ": " + ec.message());
101
102 // Collect symbol info that we want to print out.
103 std::vector<DefinedRegular *> syms = getSymbols(ctx);
104 SymbolMapTy sectionSyms = getSectionSyms(syms);
105 DenseMap<DefinedRegular *, std::string> symStr = getSymbolStrings(ctx, syms);
106
107 // Print out the header line.
108 os << "Address Size Align Out In Symbol\n";
109
110 // Print out file contents.
111 for (OutputSection *sec : ctx.outputSections) {
112 writeHeader(os, sec->getRVA(), sec->getVirtualSize(), /*align=*/pageSize);
113 os << sec->name << '\n';
114
115 for (Chunk *c : sec->chunks) {
116 auto *sc = dyn_cast<SectionChunk>(c);
117 if (!sc)
118 continue;
119
120 writeHeader(os, sc->getRVA(), sc->getSize(), sc->getAlignment());
121 os << indent8 << sc->file->getName() << ":(" << sc->getSectionName()
122 << ")\n";
123 for (DefinedRegular *sym : sectionSyms[sc])
124 os << symStr[sym] << '\n';
125 }
126 }
127 }
128