2015-05-29 03:09:30 +08:00
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//===- SymbolTable.cpp ----------------------------------------------------===//
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//
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// The LLVM Linker
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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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#include "Config.h"
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#include "Driver.h"
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2015-06-01 10:58:15 +08:00
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#include "Error.h"
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2015-05-29 03:09:30 +08:00
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#include "SymbolTable.h"
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2015-06-30 02:50:11 +08:00
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#include "Symbols.h"
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2015-05-29 03:09:30 +08:00
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#include "llvm/ADT/STLExtras.h"
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2015-06-02 04:10:10 +08:00
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#include "llvm/LTO/LTOCodeGenerator.h"
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2015-05-29 03:09:30 +08:00
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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2015-06-29 06:16:41 +08:00
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#include <utility>
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2015-05-29 03:09:30 +08:00
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2015-05-31 11:57:30 +08:00
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using namespace llvm;
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2015-05-29 03:09:30 +08:00
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namespace lld {
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namespace coff {
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SymbolTable::SymbolTable() {
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2015-07-01 03:35:21 +08:00
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addSymbol(new (Alloc) DefinedAbsolute("__ImageBase", Config->ImageBase));
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2015-05-29 03:09:30 +08:00
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}
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2015-07-01 03:35:21 +08:00
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void SymbolTable::addFile(std::unique_ptr<InputFile> FileP) {
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InputFile *File = FileP.get();
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Files.push_back(std::move(FileP));
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if (auto *F = dyn_cast<ArchiveFile>(File)) {
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ArchiveQueue.push_back(F);
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return;
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}
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ObjectQueue.push_back(File);
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if (auto *F = dyn_cast<ObjectFile>(File)) {
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ObjectFiles.push_back(F);
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} else if (auto *F = dyn_cast<BitcodeFile>(File)) {
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BitcodeFiles.push_back(F);
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} else {
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ImportFiles.push_back(cast<ImportFile>(File));
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}
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2015-05-29 03:09:30 +08:00
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}
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2015-06-24 07:56:39 +08:00
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std::error_code SymbolTable::run() {
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2015-07-01 03:35:21 +08:00
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while (!ArchiveQueue.empty() || !ObjectQueue.empty()) {
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if (auto EC = readArchives())
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return EC;
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if (auto EC = readObjects())
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return EC;
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++Version;
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}
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return std::error_code();
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}
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std::error_code SymbolTable::readArchives() {
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if (ArchiveQueue.empty())
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return std::error_code();
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// Add lazy symbols to the symbol table. Lazy symbols that conflict
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// with existing undefined symbols are accumulated in LazySyms.
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std::vector<Symbol *> LazySyms;
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for (ArchiveFile *File : ArchiveQueue) {
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2015-06-24 07:56:39 +08:00
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if (Config->Verbose)
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2015-07-01 03:35:21 +08:00
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llvm::outs() << "Reading " << File->getShortName() << "\n";
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if (auto EC = File->parse())
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2015-06-24 07:56:39 +08:00
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return EC;
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2015-07-01 03:35:21 +08:00
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for (Lazy *Sym : File->getLazySymbols())
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addLazy(Sym, &LazySyms);
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}
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ArchiveQueue.clear();
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2015-06-24 07:56:39 +08:00
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2015-07-01 03:35:21 +08:00
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// Add archive member files to ObjectQueue that should resolve
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// existing undefined symbols.
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for (Symbol *Sym : LazySyms)
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if (auto EC = addMemberFile(cast<Lazy>(Sym->Body)))
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return EC;
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return std::error_code();
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}
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2015-06-24 07:56:39 +08:00
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2015-07-01 03:35:21 +08:00
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std::error_code SymbolTable::readObjects() {
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if (ObjectQueue.empty())
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return std::error_code();
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// Add defined and undefined symbols to the symbol table.
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std::vector<StringRef> Directives;
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for (size_t I = 0; I < ObjectQueue.size(); ++I) {
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InputFile *File = ObjectQueue[I];
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if (Config->Verbose)
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llvm::outs() << "Reading " << File->getShortName() << "\n";
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if (auto EC = File->parse())
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return EC;
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// Adding symbols may add more files to ObjectQueue
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// (but not to ArchiveQueue).
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for (SymbolBody *Sym : File->getSymbols())
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if (Sym->isExternal())
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if (auto EC = addSymbol(Sym))
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return EC;
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StringRef S = File->getDirectives();
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2015-06-24 07:56:39 +08:00
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if (!S.empty())
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2015-07-01 03:35:21 +08:00
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Directives.push_back(S);
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2015-06-08 14:00:10 +08:00
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}
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2015-07-01 03:35:21 +08:00
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ObjectQueue.clear();
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// Parse directive sections. This may add files to
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// ArchiveQueue and ObjectQueue.
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for (StringRef S : Directives)
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if (auto EC = Driver->parseDirectives(S))
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return EC;
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2015-06-06 10:00:45 +08:00
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return std::error_code();
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}
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2015-05-29 03:09:30 +08:00
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bool SymbolTable::reportRemainingUndefines() {
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bool Ret = false;
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for (auto &I : Symtab) {
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Symbol *Sym = I.second;
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auto *Undef = dyn_cast<Undefined>(Sym->Body);
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if (!Undef)
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continue;
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2015-06-25 10:21:44 +08:00
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StringRef Name = Undef->getName();
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2015-06-29 04:34:09 +08:00
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// The weak alias may have been resovled, so check for that.
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2015-07-02 08:04:14 +08:00
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if (SymbolBody *Alias = Undef->WeakAlias) {
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if (auto *D = dyn_cast<Defined>(Alias->getReplacement())) {
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Sym->Body = D;
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continue;
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}
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2015-05-29 03:09:30 +08:00
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}
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2015-06-25 10:21:44 +08:00
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// If we can resolve a symbol by removing __imp_ prefix, do that.
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// This odd rule is for compatibility with MSVC linker.
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if (Name.startswith("__imp_")) {
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if (Defined *Imp = find(Name.substr(strlen("__imp_")))) {
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2015-06-25 11:31:47 +08:00
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auto *S = new (Alloc) DefinedLocalImport(Name, Imp);
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LocalImportChunks.push_back(S->getChunk());
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Sym->Body = S;
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2015-06-25 10:21:44 +08:00
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continue;
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}
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}
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llvm::errs() << "undefined symbol: " << Name << "\n";
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2015-06-29 03:35:15 +08:00
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// Remaining undefined symbols are not fatal if /force is specified.
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// They are replaced with dummy defined symbols.
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if (Config->Force) {
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Sym->Body = new (Alloc) DefinedAbsolute(Name, 0);
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continue;
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}
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2015-05-29 03:09:30 +08:00
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Ret = true;
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}
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return Ret;
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}
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2015-07-01 03:35:21 +08:00
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void SymbolTable::addLazy(Lazy *New, std::vector<Symbol *> *Accum) {
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Symbol *&Sym = Symtab[New->getName()];
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if (!Sym) {
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Sym = new (Alloc) Symbol(New);
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New->setBackref(Sym);
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return;
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}
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SymbolBody *Existing = Sym->Body;
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if (!isa<Undefined>(Existing))
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return;
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Sym->Body = New;
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New->setBackref(Sym);
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Accum->push_back(Sym);
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}
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std::error_code SymbolTable::addSymbol(SymbolBody *New) {
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// Find an existing symbol or create and insert a new one.
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assert(isa<Defined>(New) || isa<Undefined>(New));
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Symbol *&Sym = Symtab[New->getName()];
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2015-05-29 03:09:30 +08:00
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if (!Sym) {
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Sym = new (Alloc) Symbol(New);
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New->setBackref(Sym);
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return std::error_code();
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}
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New->setBackref(Sym);
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2015-07-01 03:35:21 +08:00
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// If we have an undefined symbol and a lazy symbol,
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// let the lazy symbol to read a member file.
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2015-05-29 03:09:30 +08:00
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SymbolBody *Existing = Sym->Body;
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2015-07-01 03:35:21 +08:00
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if (auto *L = dyn_cast<Lazy>(Existing)) {
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2015-07-02 06:32:23 +08:00
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// Undefined symbols with weak aliases need not to be resolved,
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// since they would be replaced with weak aliases if they remain
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// undefined.
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2015-07-01 03:35:21 +08:00
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if (auto *U = dyn_cast<Undefined>(New))
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2015-07-02 06:32:23 +08:00
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if (!U->WeakAlias)
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2015-07-01 03:35:21 +08:00
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return addMemberFile(L);
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2015-05-29 03:09:30 +08:00
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Sym->Body = New;
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2015-07-01 03:35:21 +08:00
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return std::error_code();
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2015-06-20 05:12:48 +08:00
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}
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2015-07-01 03:35:21 +08:00
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// compare() returns -1, 0, or 1 if the lhs symbol is less preferable,
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// equivalent (conflicting), or more preferable, respectively.
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int Comp = Existing->compare(New);
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if (Comp == 0) {
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2015-06-26 07:22:00 +08:00
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llvm::errs() << "duplicate symbol: " << Existing->getDebugName()
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<< " and " << New->getDebugName() << "\n";
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2015-06-01 10:58:15 +08:00
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return make_error_code(LLDError::DuplicateSymbols);
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}
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2015-07-01 03:35:21 +08:00
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if (Comp < 0)
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Sym->Body = New;
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2015-05-29 03:09:30 +08:00
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return std::error_code();
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}
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// Reads an archive member file pointed by a given symbol.
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std::error_code SymbolTable::addMemberFile(Lazy *Body) {
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auto FileOrErr = Body->getMember();
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if (auto EC = FileOrErr.getError())
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return EC;
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std::unique_ptr<InputFile> File = std::move(FileOrErr.get());
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// getMember returns an empty buffer if the member was already
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// read from the library.
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if (!File)
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return std::error_code();
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if (Config->Verbose)
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2015-06-08 13:43:50 +08:00
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llvm::outs() << "Loaded " << File->getShortName() << " for "
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2015-05-29 03:09:30 +08:00
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<< Body->getName() << "\n";
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2015-06-24 07:56:39 +08:00
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addFile(std::move(File));
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return std::error_code();
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2015-05-29 03:09:30 +08:00
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}
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std::vector<Chunk *> SymbolTable::getChunks() {
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std::vector<Chunk *> Res;
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2015-06-24 07:56:39 +08:00
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for (ObjectFile *File : ObjectFiles) {
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2015-05-29 03:09:30 +08:00
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std::vector<Chunk *> &V = File->getChunks();
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Res.insert(Res.end(), V.begin(), V.end());
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}
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return Res;
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}
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2015-05-31 11:34:08 +08:00
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Defined *SymbolTable::find(StringRef Name) {
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2015-05-29 03:09:30 +08:00
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auto It = Symtab.find(Name);
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if (It == Symtab.end())
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return nullptr;
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2015-05-31 11:34:08 +08:00
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if (auto *Def = dyn_cast<Defined>(It->second->Body))
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return Def;
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return nullptr;
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}
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2015-07-01 07:46:52 +08:00
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Symbol *SymbolTable::findSymbol(StringRef Name) {
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2015-06-29 09:03:53 +08:00
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auto It = Symtab.find(Name);
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if (It == Symtab.end())
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return nullptr;
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2015-07-01 07:46:52 +08:00
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return It->second;
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2015-06-29 09:03:53 +08:00
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}
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2015-07-02 08:04:14 +08:00
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void SymbolTable::mangleMaybe(Undefined *U) {
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if (U->WeakAlias)
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return;
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if (!isa<Undefined>(U->getReplacement()))
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return;
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2015-06-29 06:16:41 +08:00
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// In Microsoft ABI, a non-member function name is mangled this way.
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2015-07-02 08:04:14 +08:00
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std::string Prefix = ("?" + U->getName() + "@@Y").str();
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2015-06-29 06:16:41 +08:00
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for (auto I : Symtab) {
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StringRef Name = I.first;
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2015-07-02 08:04:14 +08:00
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Symbol *New = I.second;
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2015-06-29 06:16:41 +08:00
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if (!Name.startswith(Prefix))
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continue;
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2015-07-02 08:04:14 +08:00
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U->WeakAlias = New->Body;
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if (auto *L = dyn_cast<Lazy>(New->Body))
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addMemberFile(L);
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return;
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2015-06-29 06:16:41 +08:00
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}
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}
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2015-07-02 08:04:14 +08:00
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Undefined *SymbolTable::addUndefined(StringRef Name) {
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auto *U = new (Alloc) Undefined(Name);
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addSymbol(U);
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return U;
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2015-06-01 03:55:40 +08:00
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}
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2015-06-01 06:31:31 +08:00
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// Resolve To, and make From an alias to To.
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std::error_code SymbolTable::rename(StringRef From, StringRef To) {
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2015-06-20 03:23:43 +08:00
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// If From is not undefined, do nothing.
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// Otherwise, rename it to see if To can be resolved instead.
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auto It = Symtab.find(From);
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if (It == Symtab.end())
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return std::error_code();
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Symbol *Sym = It->second;
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if (!isa<Undefined>(Sym->Body))
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return std::error_code();
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2015-06-01 06:31:31 +08:00
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SymbolBody *Body = new (Alloc) Undefined(To);
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2015-07-01 03:35:21 +08:00
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if (auto EC = addSymbol(Body))
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2015-06-01 06:31:31 +08:00
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return EC;
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2015-06-29 09:03:53 +08:00
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SymbolBody *Repl = Body->getReplacement();
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if (isa<Undefined>(Repl))
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return std::error_code();
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Sym->Body = Repl;
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2015-06-20 03:23:43 +08:00
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Body->setBackref(Sym);
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2015-06-20 05:12:48 +08:00
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++Version;
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2015-06-01 06:31:31 +08:00
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return std::error_code();
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}
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2015-06-27 02:58:24 +08:00
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void SymbolTable::printMap(llvm::raw_ostream &OS) {
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for (ObjectFile *File : ObjectFiles) {
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OS << File->getShortName() << ":\n";
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for (SymbolBody *Body : File->getSymbols())
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if (auto *R = dyn_cast<DefinedRegular>(Body))
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if (R->isLive())
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OS << Twine::utohexstr(Config->ImageBase + R->getRVA())
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<< " " << R->getName() << "\n";
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}
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}
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2015-06-02 04:10:10 +08:00
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std::error_code SymbolTable::addCombinedLTOObject() {
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if (BitcodeFiles.empty())
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return std::error_code();
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|
|
|
|
|
|
|
// Create an object file and add it to the symbol table by replacing any
|
|
|
|
// DefinedBitcode symbols with the definitions in the object file.
|
2015-06-10 01:52:17 +08:00
|
|
|
LTOCodeGenerator CG;
|
|
|
|
auto FileOrErr = createLTOObject(&CG);
|
|
|
|
if (auto EC = FileOrErr.getError())
|
2015-06-02 04:10:10 +08:00
|
|
|
return EC;
|
2015-06-10 01:52:17 +08:00
|
|
|
ObjectFile *Obj = FileOrErr.get();
|
|
|
|
|
2015-06-02 04:10:10 +08:00
|
|
|
for (SymbolBody *Body : Obj->getSymbols()) {
|
|
|
|
if (!Body->isExternal())
|
|
|
|
continue;
|
2015-06-09 10:53:09 +08:00
|
|
|
// Find an existing Symbol. We should not see any new undefined symbols at
|
|
|
|
// this point.
|
2015-06-02 04:10:10 +08:00
|
|
|
StringRef Name = Body->getName();
|
2015-06-09 10:53:09 +08:00
|
|
|
Symbol *&Sym = Symtab[Name];
|
2015-06-02 04:10:10 +08:00
|
|
|
if (!Sym) {
|
2015-06-09 10:53:09 +08:00
|
|
|
if (!isa<Defined>(Body)) {
|
|
|
|
llvm::errs() << "LTO: undefined symbol: " << Name << '\n';
|
|
|
|
return make_error_code(LLDError::BrokenFile);
|
|
|
|
}
|
|
|
|
Sym = new (Alloc) Symbol(Body);
|
|
|
|
Body->setBackref(Sym);
|
|
|
|
continue;
|
2015-06-02 04:10:10 +08:00
|
|
|
}
|
|
|
|
Body->setBackref(Sym);
|
|
|
|
|
|
|
|
if (isa<DefinedBitcode>(Sym->Body)) {
|
|
|
|
// The symbol should now be defined.
|
|
|
|
if (!isa<Defined>(Body)) {
|
|
|
|
llvm::errs() << "LTO: undefined symbol: " << Name << '\n';
|
|
|
|
return make_error_code(LLDError::BrokenFile);
|
|
|
|
}
|
|
|
|
Sym->Body = Body;
|
2015-07-01 03:35:21 +08:00
|
|
|
continue;
|
2015-06-02 04:10:10 +08:00
|
|
|
}
|
2015-07-01 03:35:21 +08:00
|
|
|
if (auto *L = dyn_cast<Lazy>(Sym->Body)) {
|
|
|
|
// We may see new references to runtime library symbols such as __chkstk
|
|
|
|
// here. These symbols must be wholly defined in non-bitcode files.
|
|
|
|
if (auto EC = addMemberFile(L))
|
2015-06-24 08:12:34 +08:00
|
|
|
return EC;
|
2015-07-01 03:35:21 +08:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
SymbolBody *Existing = Sym->Body;
|
|
|
|
int Comp = Existing->compare(Body);
|
|
|
|
if (Comp == 0) {
|
|
|
|
llvm::errs() << "LTO: unexpected duplicate symbol: " << Name << "\n";
|
|
|
|
return make_error_code(LLDError::BrokenFile);
|
|
|
|
}
|
|
|
|
if (Comp < 0)
|
|
|
|
Sym->Body = Body;
|
2015-06-24 07:56:39 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
size_t NumBitcodeFiles = BitcodeFiles.size();
|
|
|
|
if (auto EC = run())
|
|
|
|
return EC;
|
|
|
|
if (BitcodeFiles.size() != NumBitcodeFiles) {
|
|
|
|
llvm::errs() << "LTO: late loaded symbol created new bitcode reference\n";
|
|
|
|
return make_error_code(LLDError::BrokenFile);
|
2015-06-02 04:10:10 +08:00
|
|
|
}
|
|
|
|
|
2015-06-09 12:29:54 +08:00
|
|
|
// New runtime library symbol references may have created undefined references.
|
|
|
|
if (reportRemainingUndefines())
|
|
|
|
return make_error_code(LLDError::BrokenFile);
|
2015-06-02 04:10:10 +08:00
|
|
|
return std::error_code();
|
|
|
|
}
|
|
|
|
|
2015-06-10 01:52:17 +08:00
|
|
|
// Combine and compile bitcode files and then return the result
|
|
|
|
// as a regular COFF object file.
|
|
|
|
ErrorOr<ObjectFile *> SymbolTable::createLTOObject(LTOCodeGenerator *CG) {
|
|
|
|
// All symbols referenced by non-bitcode objects must be preserved.
|
2015-06-24 07:56:39 +08:00
|
|
|
for (ObjectFile *File : ObjectFiles)
|
2015-06-10 01:52:17 +08:00
|
|
|
for (SymbolBody *Body : File->getSymbols())
|
|
|
|
if (auto *S = dyn_cast<DefinedBitcode>(Body->getReplacement()))
|
|
|
|
CG->addMustPreserveSymbol(S->getName());
|
|
|
|
|
2015-06-12 05:49:54 +08:00
|
|
|
// Likewise for bitcode symbols which we initially resolved to non-bitcode.
|
2015-06-24 07:56:39 +08:00
|
|
|
for (BitcodeFile *File : BitcodeFiles)
|
2015-06-12 05:49:54 +08:00
|
|
|
for (SymbolBody *Body : File->getSymbols())
|
|
|
|
if (isa<DefinedBitcode>(Body) &&
|
|
|
|
!isa<DefinedBitcode>(Body->getReplacement()))
|
|
|
|
CG->addMustPreserveSymbol(Body->getName());
|
|
|
|
|
2015-06-10 01:52:17 +08:00
|
|
|
// Likewise for other symbols that must be preserved.
|
2015-07-02 08:21:08 +08:00
|
|
|
for (Undefined *U : Config->GCRoot)
|
|
|
|
if (isa<DefinedBitcode>(U->getReplacement()))
|
|
|
|
CG->addMustPreserveSymbol(U->getName());
|
2015-06-10 01:52:17 +08:00
|
|
|
|
|
|
|
CG->setModule(BitcodeFiles[0]->releaseModule());
|
|
|
|
for (unsigned I = 1, E = BitcodeFiles.size(); I != E; ++I)
|
|
|
|
CG->addModule(BitcodeFiles[I]->getModule());
|
|
|
|
|
|
|
|
std::string ErrMsg;
|
|
|
|
LTOMB = CG->compile(false, false, false, ErrMsg); // take MB ownership
|
|
|
|
if (!LTOMB) {
|
|
|
|
llvm::errs() << ErrMsg << '\n';
|
|
|
|
return make_error_code(LLDError::BrokenFile);
|
|
|
|
}
|
2015-06-24 07:56:39 +08:00
|
|
|
auto *Obj = new ObjectFile(LTOMB->getMemBufferRef());
|
|
|
|
Files.emplace_back(Obj);
|
|
|
|
ObjectFiles.push_back(Obj);
|
2015-06-10 01:52:17 +08:00
|
|
|
if (auto EC = Obj->parse())
|
|
|
|
return EC;
|
|
|
|
return Obj;
|
|
|
|
}
|
|
|
|
|
2015-05-29 03:09:30 +08:00
|
|
|
} // namespace coff
|
|
|
|
} // namespace lld
|