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The operator == used for exporting a function with a different name in the DLL compared to the name in the import library (which is useful for adding linker level aliases for function in the import library) is a feature distinct and different from the operator = used for exporting a function with a different name (both in import library and DLL) than in the implementation producing the DLL. When creating an import library using dlltool, from a def file that contains forwards (Func = OtherDll.Func), this shouldn't affect the produced import library, which should still behave just as if it was a normal exported function. This clears a lot of confusion and subtle misunderstandings, and avoids a parameter that was used to avoid creating weak aliases when invoked from lld. (This parameter was added previously due to the existing conflation of the two features.) Differential Revision: https://reviews.llvm.org/D46245 llvm-svn: 331859
104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
//===- COFFImportFile.h - COFF short import file implementation -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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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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//
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// COFF short import file is a special kind of file which contains
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// only symbol names for DLL-exported symbols. This class implements
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// exporting of Symbols to create libraries and a SymbolicFile
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// interface for the file type.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_COFF_IMPORT_FILE_H
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#define LLVM_OBJECT_COFF_IMPORT_FILE_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/IRObjectFile.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Object/SymbolicFile.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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namespace object {
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class COFFImportFile : public SymbolicFile {
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public:
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COFFImportFile(MemoryBufferRef Source)
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: SymbolicFile(ID_COFFImportFile, Source) {}
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static bool classof(Binary const *V) { return V->isCOFFImportFile(); }
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void moveSymbolNext(DataRefImpl &Symb) const override { ++Symb.p; }
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std::error_code printSymbolName(raw_ostream &OS,
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DataRefImpl Symb) const override {
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if (Symb.p == 0)
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OS << "__imp_";
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OS << StringRef(Data.getBufferStart() + sizeof(coff_import_header));
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return std::error_code();
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}
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uint32_t getSymbolFlags(DataRefImpl Symb) const override {
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return SymbolRef::SF_Global;
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}
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basic_symbol_iterator symbol_begin() const override {
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return BasicSymbolRef(DataRefImpl(), this);
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}
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basic_symbol_iterator symbol_end() const override {
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DataRefImpl Symb;
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Symb.p = isData() ? 1 : 2;
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return BasicSymbolRef(Symb, this);
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}
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const coff_import_header *getCOFFImportHeader() const {
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return reinterpret_cast<const object::coff_import_header *>(
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Data.getBufferStart());
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}
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private:
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bool isData() const {
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return getCOFFImportHeader()->getType() == COFF::IMPORT_DATA;
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}
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};
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struct COFFShortExport {
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std::string Name;
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std::string ExtName;
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std::string SymbolName;
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std::string AliasTarget;
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uint16_t Ordinal = 0;
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bool Noname = false;
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bool Data = false;
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bool Private = false;
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bool Constant = false;
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friend bool operator==(const COFFShortExport &L, const COFFShortExport &R) {
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return L.Name == R.Name && L.ExtName == R.ExtName &&
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L.Ordinal == R.Ordinal && L.Noname == R.Noname &&
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L.Data == R.Data && L.Private == R.Private;
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}
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friend bool operator!=(const COFFShortExport &L, const COFFShortExport &R) {
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return !(L == R);
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}
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};
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Error writeImportLibrary(StringRef ImportName, StringRef Path,
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ArrayRef<COFFShortExport> Exports,
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COFF::MachineTypes Machine, bool MinGW);
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} // namespace object
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} // namespace llvm
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#endif
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