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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 "InputFiles.h"
#include "Symbols.h"
#include "lld/Common/ErrorHandler.h"
#include "lld/Common/Memory.h"
using namespace llvm;
using namespace lld;
using namespace lld::macho;
Symbol *SymbolTable::find(StringRef name) {
auto it = symMap.find(llvm::CachedHashStringRef(name));
if (it == symMap.end())
return nullptr;
return symVector[it->second];
}
std::pair<Symbol *, bool> SymbolTable::insert(StringRef name) {
auto p = symMap.insert({CachedHashStringRef(name), (int)symVector.size()});
// Name already present in the symbol table.
if (!p.second)
return {symVector[p.first->second], false};
// Name is a new symbol.
Symbol *sym = reinterpret_cast<Symbol *>(make<SymbolUnion>());
symVector.push_back(sym);
return {sym, true};
}
Symbol *SymbolTable::addDefined(StringRef name, InputSection *isec,
uint32_t value) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name);
if (!wasInserted && isa<Defined>(s))
error("duplicate symbol: " + name);
replaceSymbol<Defined>(s, name, isec, value);
return s;
}
Symbol *SymbolTable::addUndefined(StringRef name) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name);
if (wasInserted)
replaceSymbol<Undefined>(s, name);
else if (LazySymbol *lazy = dyn_cast<LazySymbol>(s))
lazy->fetchArchiveMember();
return s;
}
Symbol *SymbolTable::addDylib(StringRef name, DylibFile *file) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name);
if (wasInserted || isa<Undefined>(s))
replaceSymbol<DylibSymbol>(s, file, name);
return s;
}
Symbol *SymbolTable::addLazy(StringRef name, ArchiveFile *file,
const llvm::object::Archive::Symbol &sym) {
Symbol *s;
bool wasInserted;
std::tie(s, wasInserted) = insert(name);
if (wasInserted)
replaceSymbol<LazySymbol>(s, file, sym);
else if (isa<Undefined>(s))
file->fetch(sym);
return s;
}
SymbolTable *macho::symtab;
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