3587de2281
The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
//===- SymbolTable.h --------------------------------------------*- C++ -*-===//
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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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#ifndef LLD_MACHO_SYMBOL_TABLE_H
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#define LLD_MACHO_SYMBOL_TABLE_H
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#include "lld/Common/LLVM.h"
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#include "llvm/ADT/CachedHashString.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Object/Archive.h"
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namespace lld {
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namespace macho {
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class ArchiveFile;
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class DylibFile;
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class InputSection;
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class MachHeaderSection;
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class Symbol;
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/*
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* Note that the SymbolTable handles name collisions by calling
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* replaceSymbol(), which does an in-place update of the Symbol via `placement
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* new`. Therefore, there is no need to update any relocations that hold
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* pointers the "old" Symbol -- they will automatically point to the new one.
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*/
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class SymbolTable {
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public:
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Symbol *addDefined(StringRef name, InputSection *isec, uint32_t value,
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bool isWeakDef);
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Symbol *addUndefined(StringRef name);
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Symbol *addDylib(StringRef name, DylibFile *file, bool isWeakDef);
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Symbol *addLazy(StringRef name, ArchiveFile *file,
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const llvm::object::Archive::Symbol &sym);
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Symbol *addDSOHandle(const MachHeaderSection *);
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ArrayRef<Symbol *> getSymbols() const { return symVector; }
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Symbol *find(StringRef name);
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private:
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std::pair<Symbol *, bool> insert(StringRef name);
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llvm::DenseMap<llvm::CachedHashStringRef, int> symMap;
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std::vector<Symbol *> symVector;
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};
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extern SymbolTable *symtab;
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} // namespace macho
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} // namespace lld
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#endif
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