forked from OSchip/llvm-project
140 lines
3.6 KiB
C++
140 lines
3.6 KiB
C++
//===- MinGW.cpp ----------------------------------------------------------===//
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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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#include "MinGW.h"
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#include "lld/Common/ErrorHandler.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace lld;
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using namespace lld::coff;
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using namespace llvm;
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using namespace llvm::COFF;
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AutoExporter::AutoExporter() {
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if (Config->Machine == I386) {
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ExcludeSymbols = {
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"__NULL_IMPORT_DESCRIPTOR",
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"__pei386_runtime_relocator",
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"_do_pseudo_reloc",
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"_impure_ptr",
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"__impure_ptr",
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"__fmode",
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"_environ",
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"___dso_handle",
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// These are the MinGW names that differ from the standard
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// ones (lacking an extra underscore).
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"_DllMain@12",
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"_DllEntryPoint@12",
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"_DllMainCRTStartup@12",
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};
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} else {
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ExcludeSymbols = {
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"_NULL_IMPORT_DESCRIPTOR",
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"_pei386_runtime_relocator",
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"do_pseudo_reloc",
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"impure_ptr",
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"_impure_ptr",
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"_fmode",
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"environ",
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"__dso_handle",
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// These are the MinGW names that differ from the standard
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// ones (lacking an extra underscore).
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"DllMain",
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"DllEntryPoint",
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"DllMainCRTStartup",
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};
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}
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ExcludeLibs = {
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"libgcc",
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"libgcc_s",
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"libstdc++",
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"libmingw32",
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"libmingwex",
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"libg2c",
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"libsupc++",
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"libobjc",
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"libgcj",
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"libclang_rt.builtins-aarch64",
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"libclang_rt.builtins-arm",
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"libclang_rt.builtins-i386",
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"libclang_rt.builtins-x86_64",
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"libc++",
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"libc++abi",
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"libunwind",
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"libmsvcrt",
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"libucrtbase",
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};
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ExcludeObjects = {
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"crt0.o",
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"crt1.o",
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"crt1u.o",
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"crt2.o",
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"crt2u.o",
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"dllcrt1.o",
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"dllcrt2.o",
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"gcrt0.o",
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"gcrt1.o",
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"gcrt2.o",
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"crtbegin.o",
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"crtend.o",
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};
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}
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bool AutoExporter::shouldExport(Defined *Sym) const {
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if (!Sym || !Sym->isLive() || !Sym->getChunk())
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return false;
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// Only allow the symbol kinds that make sense to export; in particular,
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// disallow import symbols.
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if (!isa<DefinedRegular>(Sym) && !isa<DefinedCommon>(Sym))
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return false;
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if (ExcludeSymbols.count(Sym->getName()))
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return false;
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// Check that file is non-null before dereferencing it, symbols not
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// originating in regular object files probably shouldn't be exported.
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if (!Sym->getFile())
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return false;
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StringRef LibName = sys::path::filename(Sym->getFile()->ParentName);
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// Drop the file extension.
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LibName = LibName.substr(0, LibName.rfind('.'));
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if (ExcludeLibs.count(LibName))
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return false;
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StringRef FileName = sys::path::filename(Sym->getFile()->getName());
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if (LibName.empty() && ExcludeObjects.count(FileName))
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return false;
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return true;
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}
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void coff::writeDefFile(StringRef Name) {
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std::error_code EC;
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raw_fd_ostream OS(Name, EC, sys::fs::F_None);
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if (EC)
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fatal("cannot open " + Name + ": " + EC.message());
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OS << "EXPORTS\n";
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for (Export &E : Config->Exports) {
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OS << " " << E.ExportName << " "
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<< "@" << E.Ordinal;
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if (auto *Def = dyn_cast_or_null<Defined>(E.Sym)) {
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if (Def && Def->getChunk() &&
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!(Def->getChunk()->getPermissions() & IMAGE_SCN_MEM_EXECUTE))
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OS << " DATA";
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}
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OS << "\n";
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}
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}
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