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3785a413fe
Add a simple forwarding option in the MinGW frontend, and implement the private -wrap option in the COFF linker. The feature in lld-link isn't gated by the -lldmingw option, but the option is left as a private, undocumented option primarily used by the MinGW driver. The implementation is significantly based on the support for --wrap in the ELF linker, but many small nuance details are different between the ELF and COFF linkers, ending up with more than a few implementation differences. This fixes https://bugs.llvm.org/show_bug.cgi?id=47384. Differential Revision: https://reviews.llvm.org/D89004 Reapplied with the bitfield member canInline fixed so it doesn't break builds targeting windows.
64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
//===- MinGW.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_COFF_MINGW_H
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#define LLD_COFF_MINGW_H
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#include "Config.h"
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#include "Symbols.h"
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#include "lld/Common/LLVM.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/Option/ArgList.h"
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#include <vector>
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namespace lld {
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namespace coff {
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// Logic for deciding what symbols to export, when exporting all
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// symbols for MinGW.
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class AutoExporter {
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public:
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AutoExporter();
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void addWholeArchive(StringRef path);
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llvm::StringSet<> excludeSymbols;
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llvm::StringSet<> excludeSymbolPrefixes;
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llvm::StringSet<> excludeSymbolSuffixes;
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llvm::StringSet<> excludeLibs;
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llvm::StringSet<> excludeObjects;
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bool shouldExport(Defined *sym) const;
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};
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void writeDefFile(StringRef name);
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// The -wrap option is a feature to rename symbols so that you can write
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// wrappers for existing functions. If you pass `-wrap:foo`, all
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// occurrences of symbol `foo` are resolved to `__wrap_foo` (so, you are
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// expected to write `__wrap_foo` function as a wrapper). The original
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// symbol becomes accessible as `__real_foo`, so you can call that from your
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// wrapper.
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//
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// This data structure is instantiated for each -wrap option.
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struct WrappedSymbol {
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Symbol *sym;
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Symbol *real;
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Symbol *wrap;
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};
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std::vector<WrappedSymbol> addWrappedSymbols(llvm::opt::InputArgList &args);
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void wrapSymbols(ArrayRef<WrappedSymbol> wrapped);
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} // namespace coff
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} // namespace lld
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#endif
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