105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
//===- Driver.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 "Driver.h"
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#include "Config.h"
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#include "Writer.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace llvm;
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using namespace lld;
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using namespace lld::elf2;
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namespace lld {
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namespace elf2 {
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Configuration *Config;
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LinkerDriver *Driver;
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void link(ArrayRef<const char *> Args) {
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auto C = make_unique<Configuration>();
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Config = C.get();
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auto D = make_unique<LinkerDriver>();
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Driver = D.get();
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Driver->link(Args.slice(1));
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}
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void error(Twine Msg) {
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errs() << Msg << "\n";
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exit(1);
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}
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void error(std::error_code EC, Twine Prefix) {
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if (!EC)
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return;
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error(Prefix + ": " + EC.message());
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}
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void error(std::error_code EC) {
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if (!EC)
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return;
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error(EC.message());
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}
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}
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}
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// Opens a file. Path has to be resolved already.
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// Newly created memory buffers are owned by this driver.
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MemoryBufferRef LinkerDriver::openFile(StringRef Path) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = MemoryBuffer::getFile(Path);
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error(MBOrErr, Twine("cannot open ") + Path);
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std::unique_ptr<MemoryBuffer> &MB = *MBOrErr;
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MemoryBufferRef MBRef = MB->getMemBufferRef();
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OwningMBs.push_back(std::move(MB)); // take ownership
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return MBRef;
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}
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static std::unique_ptr<InputFile> createFile(MemoryBufferRef MB) {
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return std::unique_ptr<InputFile>(new ObjectFile<object::ELF64LE>(MB));
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}
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void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
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// Parse command line options.
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opt::InputArgList Args = Parser.parse(ArgsArr);
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// Handle -o
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if (auto *Arg = Args.getLastArg(OPT_output))
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Config->OutputFile = Arg->getValue();
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if (Config->OutputFile.empty())
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error("-o must be specified.");
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// Create a list of input files.
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std::vector<MemoryBufferRef> Inputs;
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for (auto *Arg : Args.filtered(OPT_INPUT)) {
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StringRef Path = Arg->getValue();
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Inputs.push_back(openFile(Path));
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}
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if (Inputs.empty())
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error("no input files.");
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// Create a symbol table.
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SymbolTable<object::ELF64LE> Symtab;
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// Parse all input files and put all symbols to the symbol table.
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// The symbol table will take care of name resolution.
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for (MemoryBufferRef MB : Inputs) {
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std::unique_ptr<InputFile> File = createFile(MB);
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Symtab.addFile(std::move(File));
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}
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// Make sure we have resolved all symbols.
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Symtab.reportRemainingUndefines();
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// Write the result.
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Writer<object::ELF64LE> Out(&Symtab);
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Out.write(Config->OutputFile);
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}
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