59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
//===- lib/ReaderWriter/PECOFF/SetSubsystemPass.h -------------------------===//
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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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#ifndef LLD_READER_WRITER_PE_COFF_SET_SUBSYSTEM_PASS_H
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#define LLD_READER_WRITER_PE_COFF_SET_SUBSYSTEM_PASS_H
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#include "lld/ReaderWriter/PECOFFLinkingContext.h"
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using llvm::COFF::WindowsSubsystem;
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namespace lld {
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namespace pecoff {
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/// If "main" or "wmain" is defined, /subsystem:console is the default. If
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/// "WinMain" or "wWinMain" is defined, /subsystem:windows is the default.
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class SetSubsystemPass : public lld::Pass {
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public:
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SetSubsystemPass(PECOFFLinkingContext &ctx) : _ctx(ctx) {}
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void perform(std::unique_ptr<MutableFile> &file) override {
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if (_ctx.getSubsystem() != WindowsSubsystem::IMAGE_SUBSYSTEM_UNKNOWN)
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return;
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StringRef main = _ctx.decorateSymbol("main");
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StringRef wmain = _ctx.decorateSymbol("wmain");
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StringRef winmain = _ctx.decorateSymbol("WinMain");
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StringRef wwinmain = _ctx.decorateSymbol("wWinMain");
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for (auto *atom : file->defined()) {
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StringRef s = atom->name();
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if (s == main || s == wmain) {
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_ctx.setSubsystem(WindowsSubsystem::IMAGE_SUBSYSTEM_WINDOWS_CUI);
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return;
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}
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if (s == winmain || s == wwinmain) {
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_ctx.setSubsystem(WindowsSubsystem::IMAGE_SUBSYSTEM_WINDOWS_GUI);
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return;
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}
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}
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if (_ctx.isDll()) {
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_ctx.setSubsystem(WindowsSubsystem::IMAGE_SUBSYSTEM_WINDOWS_GUI);
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return;
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}
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llvm_unreachable("Failed to infer the subsystem.");
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}
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private:
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PECOFFLinkingContext &_ctx;
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};
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} // namespace pecoff
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} // namespace lld
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#endif
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