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//===- lib/ReaderWriter/PECOFF/WriterImportLibrary.cpp --------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// This file is reponsible for creating the Import Library file.
///
//===----------------------------------------------------------------------===//
#include "lld/ReaderWriter/PECOFFLinkingContext.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
namespace lld {
namespace pecoff {
static std::string getOutputPath(const PECOFFLinkingContext &ctx) {
SmallString<128> path = ctx.outputPath();
llvm::sys::path::replace_extension(path, ".lib");
return path.str();
}
/// Creates a .def file containing the list of exported symbols.
static std::string
createModuleDefinitionFile(const PECOFFLinkingContext &ctx,
llvm::FileRemover &fileRemover) {
SmallString<128> defFile;
int fd;
if (llvm::sys::fs::createTemporaryFile("tmp", "def", fd, defFile)) {
llvm::errs() << "Failed to create temporary file\n";
return "";
}
llvm::raw_fd_ostream os(fd, /*shouldClose*/ true);
os << "LIBRARY \"" << llvm::sys::path::filename(ctx.outputPath()) << "\"\n"
<< "EXPORTS\n";
for (const PECOFFLinkingContext::ExportDesc &desc : ctx.getDllExports()) {
os << " " << ctx.undecorateSymbol(desc.name) << " @" << desc.ordinal;
if (desc.noname)
os << " NONAME";
if (desc.isData)
os << " DATA";
os << "\n";
}
return defFile.str();
}
/// Creates a .def file and runs lib.exe on it to create an import library.
void writeImportLibrary(const PECOFFLinkingContext &ctx) {
std::string program = "lib.exe";
std::string programPath = llvm::sys::FindProgramByName(program);
if (programPath.empty()) {
llvm::errs() << "Unable to find " << program << " in PATH\n";
return;
}
llvm::FileRemover tmpFile;
std::string defArg = "/def:";
defArg.append(createModuleDefinitionFile(ctx, tmpFile));
std::string outputArg = "/out:";
outputArg.append(getOutputPath(ctx));
std::vector<const char *> args;
args.push_back(programPath.c_str());
args.push_back("/nologo");
args.push_back("/machine:x86");
args.push_back(defArg.c_str());
args.push_back(outputArg.c_str());
args.push_back(nullptr);
if (llvm::sys::ExecuteAndWait(programPath.c_str(), &args[0]) != 0)
llvm::errs() << program << " failed\n";
}
} // end namespace pecoff
} // end namespace lld
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