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//===- DriverUtils.cpp ----------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains utility functions for the driver. Because there
// are so many small functions, we created this separate file to make
// Driver.cpp less cluttered.
//
//===----------------------------------------------------------------------===//
#include "Driver.h"
#include "Error.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/StringSaver.h"
using namespace llvm;
using namespace lld;
using namespace lld::elf2;
// Create OptTable
// Create prefix string literals used in Options.td
#define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
#include "Options.inc"
#undef PREFIX
// Create table mapping all options defined in Options.td
static const opt::OptTable::Info infoTable[] = {
#define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10) \
{ \
X1, X2, X9, X10, OPT_##ID, opt::Option::KIND##Class, X8, X7, OPT_##GROUP, \
OPT_##ALIAS, X6 \
} \
,
#include "Options.inc"
#undef OPTION
};
class ELFOptTable : public opt::OptTable {
public:
ELFOptTable() : OptTable(infoTable) {}
};
// Parses a given list of options.
opt::InputArgList elf2::parseArgs(llvm::BumpPtrAllocator *A,
ArrayRef<const char *> Argv) {
// Make InputArgList from string vectors.
ELFOptTable Table;
unsigned MissingIndex;
unsigned MissingCount;
// Expand response files. '@<filename>' is replaced by the file's contents.
SmallVector<const char *, 256> Vec(Argv.data(), Argv.data() + Argv.size());
StringSaver Saver(*A);
llvm::cl::ExpandResponseFiles(Saver, llvm::cl::TokenizeGNUCommandLine, Vec);
// Parse options and then do error checking.
opt::InputArgList Args = Table.ParseArgs(Vec, MissingIndex, MissingCount);
if (MissingCount)
error(Twine("missing arg value for \"") + Args.getArgString(MissingIndex) +
"\", expected " + Twine(MissingCount) +
(MissingCount == 1 ? " argument.\n" : " arguments"));
iterator_range<opt::arg_iterator> Unknowns = Args.filtered(OPT_UNKNOWN);
for (auto *Arg : Unknowns)
warning("warning: unknown argument: " + Arg->getSpelling());
if (Unknowns.begin() != Unknowns.end())
error("unknown argument(s) found");
return Args;
}
std::string elf2::findFromSearchPaths(StringRef Path) {
for (StringRef Dir : Config->SearchPaths) {
std::string FullPath = buildSysrootedPath(Dir, Path);
if (sys::fs::exists(FullPath))
return FullPath;
}
return "";
}
// Searches a given library from input search paths, which are filled
// from -L command line switches. Returns a path to an existent library file.
std::string elf2::searchLibrary(StringRef Path) {
std::vector<std::string> Names;
if (Path[0] == ':') {
Names.push_back(Path.drop_front());
} else {
if (!Config->Static)
Names.push_back(("lib" + Path + ".so").str());
Names.push_back(("lib" + Path + ".a").str());
}
for (const std::string &Name : Names) {
std::string S = findFromSearchPaths(Name);
if (!S.empty())
return S;
}
error("Unable to find library -l" + Path);
}
// Makes a path by concatenating Dir and File.
// If Dir starts with '=' the result will be preceded by Sysroot,
// which can be set with --sysroot command line switch.
std::string elf2::buildSysrootedPath(StringRef Dir, StringRef File) {
SmallString<128> Path;
if (Dir.startswith("="))
sys::path::append(Path, Config->Sysroot, Dir.substr(1), File);
else
sys::path::append(Path, Dir, File);
return Path.str();
}
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