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//===- Driver.cpp ---------------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Driver.h"
#include "Config.h"
#include "Error.h"
#include "InputFiles.h"
#include "SymbolTable.h"
#include "Writer.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
using namespace llvm;
using namespace lld;
using namespace lld::elf2;
namespace lld {
namespace elf2 {
Configuration *Config;
void link(ArrayRef<const char *> Args) {
Configuration C;
Config = &C;
LinkerDriver().link(Args.slice(1));
}
}
}
// Opens a file. Path has to be resolved already.
// Newly created memory buffers are owned by this driver.
MemoryBufferRef LinkerDriver::openFile(StringRef Path) {
ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = MemoryBuffer::getFile(Path);
error(MBOrErr, Twine("cannot open ") + Path);
std::unique_ptr<MemoryBuffer> &MB = *MBOrErr;
MemoryBufferRef MBRef = MB->getMemBufferRef();
OwningMBs.push_back(std::move(MB)); // take ownership
return MBRef;
}
static std::unique_ptr<InputFile> createFile(MemoryBufferRef MB) {
using namespace llvm::sys::fs;
file_magic Magic = identify_magic(MB.getBuffer());
if (Magic == file_magic::archive)
return make_unique<ArchiveFile>(MB);
if (Magic == file_magic::elf_shared_object)
return createELFFile<SharedFile>(MB);
return createELFFile<ObjectFile>(MB);
}
// Searches a given library from input search paths, which are filled
// from -L command line switches. Returns a path to an existent library file.
static std::string searchLibrary(StringRef Path) {
std::vector<std::string> Names;
if (Path[0] == ':') {
Names.push_back(Path.drop_front().str());
} else {
Names.push_back((Twine("lib") + Path + ".so").str());
Names.push_back((Twine("lib") + Path + ".a").str());
}
SmallString<128> FullPath;
for (StringRef Dir : Config->InputSearchPaths) {
for (const std::string &Name : Names) {
FullPath = Dir;
sys::path::append(FullPath, Name);
if (sys::fs::exists(FullPath.str()))
return FullPath.str().str();
}
}
error(Twine("Unable to find library -l") + Path);
}
void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
// Parse command line options.
opt::InputArgList Args = Parser.parse(ArgsArr);
// Handle -o
if (auto *Arg = Args.getLastArg(OPT_output))
Config->OutputFile = Arg->getValue();
if (Config->OutputFile.empty())
error("-o must be specified.");
// Handle -dynamic-linker
if (auto *Arg = Args.getLastArg(OPT_dynamic_linker))
Config->DynamicLinker = Arg->getValue();
std::vector<StringRef> RPaths;
for (auto *Arg : Args.filtered(OPT_rpath))
RPaths.push_back(Arg->getValue());
if (!RPaths.empty())
Config->RPath = llvm::join(RPaths.begin(), RPaths.end(), ":");
for (auto *Arg : Args.filtered(OPT_L))
Config->InputSearchPaths.push_back(Arg->getValue());
if (Args.hasArg(OPT_shared))
Config->Shared = true;
if (Args.hasArg(OPT_discard_all))
Config->DiscardAll = true;
if (Args.hasArg(OPT_discard_locals))
Config->DiscardLocals = true;
if (Args.hasArg(OPT_discard_none))
Config->DiscardNone = true;
if (Args.hasArg(OPT_export_dynamic))
Config->ExportDynamic = true;
if (Args.hasArg(OPT_noinhibit_exec))
Config->NoInhibitExec = true;
// Create a list of input files.
std::vector<MemoryBufferRef> Inputs;
for (auto *Arg : Args.filtered(OPT_l, OPT_INPUT)) {
StringRef Path = Arg->getValue();
if (Arg->getOption().getID() == OPT_l) {
Inputs.push_back(openFile(searchLibrary(Path)));
continue;
}
Inputs.push_back(openFile(Path));
}
if (Inputs.empty())
error("no input files.");
// Create a symbol table.
SymbolTable Symtab;
// Parse all input files and put all symbols to the symbol table.
// The symbol table will take care of name resolution.
for (MemoryBufferRef MB : Inputs) {
std::unique_ptr<InputFile> File = createFile(MB);
Symtab.addFile(std::move(File));
}
// Write the result.
const ELFFileBase *FirstObj = Symtab.getFirstELF();
switch (FirstObj->getELFKind()) {
case ELF32LEKind:
writeResult<object::ELF32LE>(&Symtab);
return;
case ELF32BEKind:
writeResult<object::ELF32BE>(&Symtab);
return;
case ELF64LEKind:
writeResult<object::ELF64LE>(&Symtab);
return;
case ELF64BEKind:
writeResult<object::ELF64BE>(&Symtab);
return;
}
}
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