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2b920ae78c
With this change, basic archive files can be linked together. Input section discovery has been refactored into a function since archive files lazily resolve their symbols / the object files containing those symbols. Reviewed By: int3, smeenai Differential Revision: https://reviews.llvm.org/D78342
88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
//===- SymbolTable.cpp ----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "SymbolTable.h"
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#include "InputFiles.h"
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#include "Symbols.h"
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#include "lld/Common/ErrorHandler.h"
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#include "lld/Common/Memory.h"
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using namespace llvm;
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using namespace lld;
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using namespace lld::macho;
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Symbol *SymbolTable::find(StringRef name) {
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auto it = symMap.find(llvm::CachedHashStringRef(name));
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if (it == symMap.end())
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return nullptr;
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return symVector[it->second];
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}
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std::pair<Symbol *, bool> SymbolTable::insert(StringRef name) {
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auto p = symMap.insert({CachedHashStringRef(name), (int)symVector.size()});
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// Name already present in the symbol table.
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if (!p.second)
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return {symVector[p.first->second], false};
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// Name is a new symbol.
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Symbol *sym = reinterpret_cast<Symbol *>(make<SymbolUnion>());
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symVector.push_back(sym);
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return {sym, true};
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}
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Symbol *SymbolTable::addDefined(StringRef name, InputSection *isec,
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uint32_t value) {
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Symbol *s;
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bool wasInserted;
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std::tie(s, wasInserted) = insert(name);
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if (!wasInserted && isa<Defined>(s))
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error("duplicate symbol: " + name);
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replaceSymbol<Defined>(s, name, isec, value);
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return s;
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}
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Symbol *SymbolTable::addUndefined(StringRef name) {
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Symbol *s;
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bool wasInserted;
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std::tie(s, wasInserted) = insert(name);
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if (wasInserted)
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replaceSymbol<Undefined>(s, name);
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else if (LazySymbol *lazy = dyn_cast<LazySymbol>(s))
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lazy->fetchArchiveMember();
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return s;
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}
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Symbol *SymbolTable::addDylib(StringRef name, DylibFile *file) {
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Symbol *s;
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bool wasInserted;
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std::tie(s, wasInserted) = insert(name);
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if (wasInserted || isa<Undefined>(s))
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replaceSymbol<DylibSymbol>(s, file, name);
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return s;
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}
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Symbol *SymbolTable::addLazy(StringRef name, ArchiveFile *file,
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const llvm::object::Archive::Symbol &sym) {
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Symbol *s;
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bool wasInserted;
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std::tie(s, wasInserted) = insert(name);
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if (wasInserted)
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replaceSymbol<LazySymbol>(s, file, sym);
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else if (isa<Undefined>(s))
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file->fetch(sym);
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return s;
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}
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SymbolTable *macho::symtab;
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