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