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llvm-project/lld/COFF/SymbolTable.cpp
Bob Haarman 7dc5e7a0a4 reland "[lld-link] implement -start-lib and -end-lib" 
Summary:
This is a re-land of r370487 with a fix for the use-after-free bug
that rev contained.

This implements -start-lib and -end-lib flags for lld-link, analogous
to the similarly named options in ld.lld. Object files after
-start-lib are included in the link only when needed to resolve
undefined symbols. The -end-lib flag goes back to the normal behavior
of always including object files in the link. This mimics the
semantics of static libraries, but without needing to actually create
the archive file.

Reviewers: ruiu, smeenai, MaskRay

Reviewed By: ruiu, MaskRay

Subscribers: akhuang, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66848

llvm-svn: 370816
2019-09-03 20:32:16 +00:00

726 lines
22 KiB
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//===- SymbolTable.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
//
//===----------------------------------------------------------------------===//
#include "SymbolTable.h"
#include "Config.h"
#include "Driver.h"
#include "LTO.h"
#include "PDB.h"
#include "Symbols.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/Memory.h"
#include "lld/Common/Timer.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Object/WindowsMachineFlag.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <utility>
using namespace llvm;
namespace lld {
namespace coff {
static Timer ltoTimer("LTO", Timer::root());
SymbolTable *symtab;
void SymbolTable::addFile(InputFile *file) {
log("Reading " + toString(file));
file->parse();
MachineTypes mt = file->getMachineType();
if (config->machine == IMAGE_FILE_MACHINE_UNKNOWN) {
config->machine = mt;
} else if (mt != IMAGE_FILE_MACHINE_UNKNOWN && config->machine != mt) {
error(toString(file) + ": machine type " + machineToStr(mt) +
" conflicts with " + machineToStr(config->machine));
return;
}
if (auto *f = dyn_cast<ObjFile>(file)) {
ObjFile::instances.push_back(f);
} else if (auto *f = dyn_cast<BitcodeFile>(file)) {
BitcodeFile::instances.push_back(f);
} else if (auto *f = dyn_cast<ImportFile>(file)) {
ImportFile::instances.push_back(f);
}
driver->parseDirectives(file);
}
static void errorOrWarn(const Twine &s) {
if (config->forceUnresolved)
warn(s);
else
error(s);
}
// Causes the file associated with a lazy symbol to be linked in.
static void forceLazy(Symbol *s) {
s->pendingArchiveLoad = true;
switch (s->kind()) {
case Symbol::Kind::LazyArchiveKind: {
auto *l = cast<LazyArchive>(s);
l->file->addMember(l->sym);
break;
}
case Symbol::Kind::LazyObjectKind:
cast<LazyObject>(s)->file->fetch();
break;
default:
llvm_unreachable(
"symbol passed to forceLazy is not a LazyArchive or LazyObject");
}
}
// Returns the symbol in SC whose value is <= Addr that is closest to Addr.
// This is generally the global variable or function whose definition contains
// Addr.
static Symbol *getSymbol(SectionChunk *sc, uint32_t addr) {
DefinedRegular *candidate = nullptr;
for (Symbol *s : sc->file->getSymbols()) {
auto *d = dyn_cast_or_null<DefinedRegular>(s);
if (!d || !d->data || d->file != sc->file || d->getChunk() != sc ||
d->getValue() > addr ||
(candidate && d->getValue() < candidate->getValue()))
continue;
candidate = d;
}
return candidate;
}
static std::vector<std::string> getSymbolLocations(BitcodeFile *file) {
std::string res("\n>>> referenced by ");
StringRef source = file->obj->getSourceFileName();
if (!source.empty())
res += source.str() + "\n>>> ";
res += toString(file);
return {res};
}
// Given a file and the index of a symbol in that file, returns a description
// of all references to that symbol from that file. If no debug information is
// available, returns just the name of the file, else one string per actual
// reference as described in the debug info.
std::vector<std::string> getSymbolLocations(ObjFile *file, uint32_t symIndex) {
struct Location {
Symbol *sym;
std::pair<StringRef, uint32_t> fileLine;
};
std::vector<Location> locations;
for (Chunk *c : file->getChunks()) {
auto *sc = dyn_cast<SectionChunk>(c);
if (!sc)
continue;
for (const coff_relocation &r : sc->getRelocs()) {
if (r.SymbolTableIndex != symIndex)
continue;
std::pair<StringRef, uint32_t> fileLine =
getFileLine(sc, r.VirtualAddress);
Symbol *sym = getSymbol(sc, r.VirtualAddress);
if (!fileLine.first.empty() || sym)
locations.push_back({sym, fileLine});
}
}
if (locations.empty())
return std::vector<std::string>({"\n>>> referenced by " + toString(file)});
std::vector<std::string> symbolLocations(locations.size());
size_t i = 0;
for (Location loc : locations) {
llvm::raw_string_ostream os(symbolLocations[i++]);
os << "\n>>> referenced by ";
if (!loc.fileLine.first.empty())
os << loc.fileLine.first << ":" << loc.fileLine.second
<< "\n>>> ";
os << toString(file);
if (loc.sym)
os << ":(" << toString(*loc.sym) << ')';
}
return symbolLocations;
}
std::vector<std::string> getSymbolLocations(InputFile *file,
uint32_t symIndex) {
if (auto *o = dyn_cast<ObjFile>(file))
return getSymbolLocations(o, symIndex);
if (auto *b = dyn_cast<BitcodeFile>(file))
return getSymbolLocations(b);
llvm_unreachable("unsupported file type passed to getSymbolLocations");
return {};
}
// For an undefined symbol, stores all files referencing it and the index of
// the undefined symbol in each file.
struct UndefinedDiag {
Symbol *sym;
struct File {
InputFile *file;
uint32_t symIndex;
};
std::vector<File> files;
};
static void reportUndefinedSymbol(const UndefinedDiag &undefDiag) {
std::string out;
llvm::raw_string_ostream os(out);
os << "undefined symbol: " << toString(*undefDiag.sym);
const size_t maxUndefReferences = 10;
size_t i = 0, numRefs = 0;
for (const UndefinedDiag::File &ref : undefDiag.files) {
std::vector<std::string> symbolLocations =
getSymbolLocations(ref.file, ref.symIndex);
numRefs += symbolLocations.size();
for (const std::string &s : symbolLocations) {
if (i >= maxUndefReferences)
break;
os << s;
i++;
}
}
if (i < numRefs)
os << "\n>>> referenced " << numRefs - i << " more times";
errorOrWarn(os.str());
}
void SymbolTable::loadMinGWAutomaticImports() {
for (auto &i : symMap) {
Symbol *sym = i.second;
auto *undef = dyn_cast<Undefined>(sym);
if (!undef)
continue;
if (!sym->isUsedInRegularObj)
continue;
if (undef->getWeakAlias())
continue;
StringRef name = undef->getName();
if (name.startswith("__imp_"))
continue;
// If we have an undefined symbol, but we have a lazy symbol we could
// load, load it.
Symbol *l = find(("__imp_" + name).str());
if (!l || l->pendingArchiveLoad || !l->isLazy())
continue;
log("Loading lazy " + l->getName() + " from " + l->getFile()->getName() +
" for automatic import");
forceLazy(l);
}
}
Defined *SymbolTable::impSymbol(StringRef name) {
if (name.startswith("__imp_"))
return nullptr;
return dyn_cast_or_null<Defined>(find(("__imp_" + name).str()));
}
bool SymbolTable::handleMinGWAutomaticImport(Symbol *sym, StringRef name) {
Defined *imp = impSymbol(name);
if (!imp)
return false;
// Replace the reference directly to a variable with a reference
// to the import address table instead. This obviously isn't right,
// but we mark the symbol as isRuntimePseudoReloc, and a later pass
// will add runtime pseudo relocations for every relocation against
// this Symbol. The runtime pseudo relocation framework expects the
// reference itself to point at the IAT entry.
size_t impSize = 0;
if (isa<DefinedImportData>(imp)) {
log("Automatically importing " + name + " from " +
cast<DefinedImportData>(imp)->getDLLName());
impSize = sizeof(DefinedImportData);
} else if (isa<DefinedRegular>(imp)) {
log("Automatically importing " + name + " from " +
toString(cast<DefinedRegular>(imp)->file));
impSize = sizeof(DefinedRegular);
} else {
warn("unable to automatically import " + name + " from " + imp->getName() +
" from " + toString(cast<DefinedRegular>(imp)->file) +
"; unexpected symbol type");
return false;
}
sym->replaceKeepingName(imp, impSize);
sym->isRuntimePseudoReloc = true;
// There may exist symbols named .refptr.<name> which only consist
// of a single pointer to <name>. If it turns out <name> is
// automatically imported, we don't need to keep the .refptr.<name>
// pointer at all, but redirect all accesses to it to the IAT entry
// for __imp_<name> instead, and drop the whole .refptr.<name> chunk.
DefinedRegular *refptr =
dyn_cast_or_null<DefinedRegular>(find((".refptr." + name).str()));
if (refptr && refptr->getChunk()->getSize() == config->wordsize) {
SectionChunk *sc = dyn_cast_or_null<SectionChunk>(refptr->getChunk());
if (sc && sc->getRelocs().size() == 1 && *sc->symbols().begin() == sym) {
log("Replacing .refptr." + name + " with " + imp->getName());
refptr->getChunk()->live = false;
refptr->replaceKeepingName(imp, impSize);
}
}
return true;
}
/// Helper function for reportUnresolvable and resolveRemainingUndefines.
/// This function emits an "undefined symbol" diagnostic for each symbol in
/// undefs. If localImports is not nullptr, it also emits a "locally
/// defined symbol imported" diagnostic for symbols in localImports.
/// objFiles and bitcodeFiles (if not nullptr) are used to report where
/// undefined symbols are referenced.
static void
reportProblemSymbols(const SmallPtrSetImpl<Symbol *> &undefs,
const DenseMap<Symbol *, Symbol *> *localImports,
const std::vector<ObjFile *> objFiles,
const std::vector<BitcodeFile *> *bitcodeFiles) {
// Return early if there is nothing to report (which should be
// the common case).
if (undefs.empty() && (!localImports || localImports->empty()))
return;
for (Symbol *b : config->gcroot) {
if (undefs.count(b))
errorOrWarn("<root>: undefined symbol: " + toString(*b));
if (localImports)
if (Symbol *imp = localImports->lookup(b))
warn("<root>: locally defined symbol imported: " + toString(*imp) +
" (defined in " + toString(imp->getFile()) + ") [LNK4217]");
}
std::vector<UndefinedDiag> undefDiags;
DenseMap<Symbol *, int> firstDiag;
auto processFile = [&](InputFile *file, ArrayRef<Symbol *> symbols) {
uint32_t symIndex = (uint32_t)-1;
for (Symbol *sym : symbols) {
++symIndex;
if (!sym)
continue;
if (undefs.count(sym)) {
auto it = firstDiag.find(sym);
if (it == firstDiag.end()) {
firstDiag[sym] = undefDiags.size();
undefDiags.push_back({sym, {{file, symIndex}}});
} else {
undefDiags[it->second].files.push_back({file, symIndex});
}
}
if (localImports)
if (Symbol *imp = localImports->lookup(sym))
warn(toString(file) +
": locally defined symbol imported: " + toString(*imp) +
" (defined in " + toString(imp->getFile()) + ") [LNK4217]");
}
};
for (ObjFile *file : objFiles)
processFile(file, file->getSymbols());
if (bitcodeFiles)
for (BitcodeFile *file : *bitcodeFiles)
processFile(file, file->getSymbols());
for (const UndefinedDiag &undefDiag : undefDiags)
reportUndefinedSymbol(undefDiag);
}
void SymbolTable::reportUnresolvable() {
SmallPtrSet<Symbol *, 8> undefs;
for (auto &i : symMap) {
Symbol *sym = i.second;
auto *undef = dyn_cast<Undefined>(sym);
if (!undef)
continue;
if (undef->getWeakAlias())
continue;
StringRef name = undef->getName();
if (name.startswith("__imp_")) {
Symbol *imp = find(name.substr(strlen("__imp_")));
if (imp && isa<Defined>(imp))
continue;
}
if (name.contains("_PchSym_"))
continue;
if (config->mingw && impSymbol(name))
continue;
undefs.insert(sym);
}
reportProblemSymbols(undefs,
/* localImports */ nullptr, ObjFile::instances,
&BitcodeFile::instances);
}
void SymbolTable::resolveRemainingUndefines() {
SmallPtrSet<Symbol *, 8> undefs;
DenseMap<Symbol *, Symbol *> localImports;
for (auto &i : symMap) {
Symbol *sym = i.second;
auto *undef = dyn_cast<Undefined>(sym);
if (!undef)
continue;
if (!sym->isUsedInRegularObj)
continue;
StringRef name = undef->getName();
// A weak alias may have been resolved, so check for that.
if (Defined *d = undef->getWeakAlias()) {
// We want to replace Sym with D. However, we can't just blindly
// copy sizeof(SymbolUnion) bytes from D to Sym because D may be an
// internal symbol, and internal symbols are stored as "unparented"
// Symbols. For that reason we need to check which type of symbol we
// are dealing with and copy the correct number of bytes.
if (isa<DefinedRegular>(d))
memcpy(sym, d, sizeof(DefinedRegular));
else if (isa<DefinedAbsolute>(d))
memcpy(sym, d, sizeof(DefinedAbsolute));
else
memcpy(sym, d, sizeof(SymbolUnion));
continue;
}
// If we can resolve a symbol by removing __imp_ prefix, do that.
// This odd rule is for compatibility with MSVC linker.
if (name.startswith("__imp_")) {
Symbol *imp = find(name.substr(strlen("__imp_")));
if (imp && isa<Defined>(imp)) {
auto *d = cast<Defined>(imp);
replaceSymbol<DefinedLocalImport>(sym, name, d);
localImportChunks.push_back(cast<DefinedLocalImport>(sym)->getChunk());
localImports[sym] = d;
continue;
}
}
// We don't want to report missing Microsoft precompiled headers symbols.
// A proper message will be emitted instead in PDBLinker::aquirePrecompObj
if (name.contains("_PchSym_"))
continue;
if (config->mingw && handleMinGWAutomaticImport(sym, name))
continue;
// Remaining undefined symbols are not fatal if /force is specified.
// They are replaced with dummy defined symbols.
if (config->forceUnresolved)
replaceSymbol<DefinedAbsolute>(sym, name, 0);
undefs.insert(sym);
}
reportProblemSymbols(
undefs, config->warnLocallyDefinedImported ? &localImports : nullptr,
ObjFile::instances, /* bitcode files no longer needed */ nullptr);
}
std::pair<Symbol *, bool> SymbolTable::insert(StringRef name) {
bool inserted = false;
Symbol *&sym = symMap[CachedHashStringRef(name)];
if (!sym) {
sym = reinterpret_cast<Symbol *>(make<SymbolUnion>());
sym->isUsedInRegularObj = false;
sym->pendingArchiveLoad = false;
inserted = true;
}
return {sym, inserted};
}
std::pair<Symbol *, bool> SymbolTable::insert(StringRef name, InputFile *file) {
std::pair<Symbol *, bool> result = insert(name);
if (!file || !isa<BitcodeFile>(file))
result.first->isUsedInRegularObj = true;
return result;
}
Symbol *SymbolTable::addUndefined(StringRef name, InputFile *f,
bool isWeakAlias) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name, f);
if (wasInserted || (s->isLazy() && isWeakAlias)) {
replaceSymbol<Undefined>(s, name);
return s;
}
if (s->isLazy())
forceLazy(s);
return s;
}
void SymbolTable::addLazyArchive(ArchiveFile *f, const Archive::Symbol &sym) {
StringRef name = sym.getName();
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name);
if (wasInserted) {
replaceSymbol<LazyArchive>(s, f, sym);
return;
}
auto *u = dyn_cast<Undefined>(s);
if (!u || u->weakAlias || s->pendingArchiveLoad)
return;
s->pendingArchiveLoad = true;
f->addMember(sym);
}
void SymbolTable::addLazyObject(LazyObjFile *f, StringRef n) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, f);
if (wasInserted) {
replaceSymbol<LazyObject>(s, f, n);
return;
}
auto *u = dyn_cast<Undefined>(s);
if (!u || u->weakAlias || s->pendingArchiveLoad)
return;
s->pendingArchiveLoad = true;
f->fetch();
}
void SymbolTable::reportDuplicate(Symbol *existing, InputFile *newFile) {
std::string msg = "duplicate symbol: " + toString(*existing) + " in " +
toString(existing->getFile()) + " and in " +
toString(newFile);
if (config->forceMultiple)
warn(msg);
else
error(msg);
}
Symbol *SymbolTable::addAbsolute(StringRef n, COFFSymbolRef sym) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, nullptr);
s->isUsedInRegularObj = true;
if (wasInserted || isa<Undefined>(s) || s->isLazy())
replaceSymbol<DefinedAbsolute>(s, n, sym);
else if (!isa<DefinedCOFF>(s))
reportDuplicate(s, nullptr);
return s;
}
Symbol *SymbolTable::addAbsolute(StringRef n, uint64_t va) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, nullptr);
s->isUsedInRegularObj = true;
if (wasInserted || isa<Undefined>(s) || s->isLazy())
replaceSymbol<DefinedAbsolute>(s, n, va);
else if (!isa<DefinedCOFF>(s))
reportDuplicate(s, nullptr);
return s;
}
Symbol *SymbolTable::addSynthetic(StringRef n, Chunk *c) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, nullptr);
s->isUsedInRegularObj = true;
if (wasInserted || isa<Undefined>(s) || s->isLazy())
replaceSymbol<DefinedSynthetic>(s, n, c);
else if (!isa<DefinedCOFF>(s))
reportDuplicate(s, nullptr);
return s;
}
Symbol *SymbolTable::addRegular(InputFile *f, StringRef n,
const coff_symbol_generic *sym,
SectionChunk *c) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, f);
if (wasInserted || !isa<DefinedRegular>(s))
replaceSymbol<DefinedRegular>(s, f, n, /*IsCOMDAT*/ false,
/*IsExternal*/ true, sym, c);
else
reportDuplicate(s, f);
return s;
}
std::pair<DefinedRegular *, bool>
SymbolTable::addComdat(InputFile *f, StringRef n,
const coff_symbol_generic *sym) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, f);
if (wasInserted || !isa<DefinedRegular>(s)) {
replaceSymbol<DefinedRegular>(s, f, n, /*IsCOMDAT*/ true,
/*IsExternal*/ true, sym, nullptr);
return {cast<DefinedRegular>(s), true};
}
auto *existingSymbol = cast<DefinedRegular>(s);
if (!existingSymbol->isCOMDAT)
reportDuplicate(s, f);
return {existingSymbol, false};
}
Symbol *SymbolTable::addCommon(InputFile *f, StringRef n, uint64_t size,
const coff_symbol_generic *sym, CommonChunk *c) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, f);
if (wasInserted || !isa<DefinedCOFF>(s))
replaceSymbol<DefinedCommon>(s, f, n, size, sym, c);
else if (auto *dc = dyn_cast<DefinedCommon>(s))
if (size > dc->getSize())
replaceSymbol<DefinedCommon>(s, f, n, size, sym, c);
return s;
}
Symbol *SymbolTable::addImportData(StringRef n, ImportFile *f) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(n, nullptr);
s->isUsedInRegularObj = true;
if (wasInserted || isa<Undefined>(s) || s->isLazy()) {
replaceSymbol<DefinedImportData>(s, n, f);
return s;
}
reportDuplicate(s, f);
return nullptr;
}
Symbol *SymbolTable::addImportThunk(StringRef name, DefinedImportData *id,
uint16_t machine) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name, nullptr);
s->isUsedInRegularObj = true;
if (wasInserted || isa<Undefined>(s) || s->isLazy()) {
replaceSymbol<DefinedImportThunk>(s, name, id, machine);
return s;
}
reportDuplicate(s, id->file);
return nullptr;
}
void SymbolTable::addLibcall(StringRef name) {
Symbol *sym = findUnderscore(name);
if (!sym)
return;
if (auto *l = dyn_cast<LazyArchive>(sym)) {
MemoryBufferRef mb = l->getMemberBuffer();
if (isBitcode(mb))
addUndefined(sym->getName());
} else if (LazyObject *o = dyn_cast<LazyObject>(sym)) {
if (isBitcode(o->file->mb))
addUndefined(sym->getName());
}
}
std::vector<Chunk *> SymbolTable::getChunks() {
std::vector<Chunk *> res;
for (ObjFile *file : ObjFile::instances) {
ArrayRef<Chunk *> v = file->getChunks();
res.insert(res.end(), v.begin(), v.end());
}
return res;
}
Symbol *SymbolTable::find(StringRef name) {
return symMap.lookup(CachedHashStringRef(name));
}
Symbol *SymbolTable::findUnderscore(StringRef name) {
if (config->machine == I386)
return find(("_" + name).str());
return find(name);
}
// Return all symbols that start with Prefix, possibly ignoring the first
// character of Prefix or the first character symbol.
std::vector<Symbol *> SymbolTable::getSymsWithPrefix(StringRef prefix) {
std::vector<Symbol *> syms;
for (auto pair : symMap) {
StringRef name = pair.first.val();
if (name.startswith(prefix) || name.startswith(prefix.drop_front()) ||
name.drop_front().startswith(prefix) ||
name.drop_front().startswith(prefix.drop_front())) {
syms.push_back(pair.second);
}
}
return syms;
}
Symbol *SymbolTable::findMangle(StringRef name) {
if (Symbol *sym = find(name))
if (!isa<Undefined>(sym))
return sym;
// Efficient fuzzy string lookup is impossible with a hash table, so iterate
// the symbol table once and collect all possibly matching symbols into this
// vector. Then compare each possibly matching symbol with each possible
// mangling.
std::vector<Symbol *> syms = getSymsWithPrefix(name);
auto findByPrefix = [&syms](const Twine &t) -> Symbol * {
std::string prefix = t.str();
for (auto *s : syms)
if (s->getName().startswith(prefix))
return s;
return nullptr;
};
// For non-x86, just look for C++ functions.
if (config->machine != I386)
return findByPrefix("?" + name + "@@Y");
if (!name.startswith("_"))
return nullptr;
// Search for x86 stdcall function.
if (Symbol *s = findByPrefix(name + "@"))
return s;
// Search for x86 fastcall function.
if (Symbol *s = findByPrefix("@" + name.substr(1) + "@"))
return s;
// Search for x86 vectorcall function.
if (Symbol *s = findByPrefix(name.substr(1) + "@@"))
return s;
// Search for x86 C++ non-member function.
return findByPrefix("?" + name.substr(1) + "@@Y");
}
Symbol *SymbolTable::addUndefined(StringRef name) {
return addUndefined(name, nullptr, false);
}
std::vector<StringRef> SymbolTable::compileBitcodeFiles() {
lto.reset(new BitcodeCompiler);
for (BitcodeFile *f : BitcodeFile::instances)
lto->add(*f);
return lto->compile();
}
void SymbolTable::addCombinedLTOObjects() {
if (BitcodeFile::instances.empty())
return;
ScopedTimer t(ltoTimer);
for (StringRef object : compileBitcodeFiles()) {
auto *obj = make<ObjFile>(MemoryBufferRef(object, "lto.tmp"));
obj->parse();
ObjFile::instances.push_back(obj);
}
}
} // namespace coff
} // namespace lld
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