1 //===- DriverUtils.cpp ----------------------------------------------------===//
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains utility functions for the driver. Because there
11 // are so many small functions, we created this separate file to make
12 // Driver.cpp less cluttered.
14 //===----------------------------------------------------------------------===//
19 #include "ScriptParser.h"
20 #include "lld/Config/Version.h"
21 #include "lld/Core/Reproduce.h"
22 #include "llvm/ADT/Optional.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/Triple.h"
25 #include "llvm/Option/Option.h"
26 #include "llvm/Support/CommandLine.h"
27 #include "llvm/Support/FileSystem.h"
28 #include "llvm/Support/Path.h"
29 #include "llvm/Support/Process.h"
32 using namespace llvm::sys;
35 using namespace lld::elf;
39 // Create prefix string literals used in Options.td
40 #define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE;
41 #include "ELF/Options.inc"
44 // Create table mapping all options defined in Options.td
45 static const opt::OptTable::Info OptInfo[] = {
46 #define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10) \
47 {X1, X2, X9, X10, OPT_##ID, opt::Option::KIND##Class, \
48 X8, X7, OPT_##GROUP, OPT_##ALIAS, X6},
49 #include "ELF/Options.inc"
53 ELFOptTable::ELFOptTable() : OptTable(OptInfo) {}
55 // Parse -color-diagnostics={auto,always,never} or -no-color-diagnostics.
56 static bool getColorDiagnostics(opt::InputArgList &Args) {
57 bool Default = (ErrorOS == &errs() && Process::StandardErrHasColors());
59 auto *Arg = Args.getLastArg(OPT_color_diagnostics, OPT_color_diagnostics_eq,
60 OPT_no_color_diagnostics);
63 if (Arg->getOption().getID() == OPT_color_diagnostics)
65 if (Arg->getOption().getID() == OPT_no_color_diagnostics)
68 StringRef S = Arg->getValue();
74 error("unknown option: -color-diagnostics=" + S);
78 static cl::TokenizerCallback getQuotingStyle(opt::InputArgList &Args) {
79 if (auto *Arg = Args.getLastArg(OPT_rsp_quoting)) {
80 StringRef S = Arg->getValue();
81 if (S != "windows" && S != "posix")
82 error("invalid response file quoting: " + S);
84 return cl::TokenizeWindowsCommandLine;
85 return cl::TokenizeGNUCommandLine;
87 if (Triple(sys::getProcessTriple()).getOS() == Triple::Win32)
88 return cl::TokenizeWindowsCommandLine;
89 return cl::TokenizeGNUCommandLine;
92 // Parses a given list of options.
93 opt::InputArgList ELFOptTable::parse(ArrayRef<const char *> Argv) {
94 // Make InputArgList from string vectors.
95 unsigned MissingIndex;
96 unsigned MissingCount;
97 SmallVector<const char *, 256> Vec(Argv.data(), Argv.data() + Argv.size());
99 // We need to get the quoting style for response files before parsing all
100 // options so we parse here before and ignore all the options but
102 opt::InputArgList Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
104 // Expand response files (arguments in the form of @<filename>)
105 // and then parse the argument again.
106 cl::ExpandResponseFiles(Saver, getQuotingStyle(Args), Vec);
107 Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
109 // Interpret -color-diagnostics early so that error messages
110 // for unknown flags are colored.
111 Config->ColorDiagnostics = getColorDiagnostics(Args);
113 error(Twine(Args.getArgString(MissingIndex)) + ": missing argument");
115 for (auto *Arg : Args.filtered(OPT_UNKNOWN))
116 error("unknown argument: " + Arg->getSpelling());
120 void elf::printHelp(const char *Argv0) {
122 Table.PrintHelp(outs(), Argv0, "lld", false);
125 // Reconstructs command line arguments so that so that you can re-run
126 // the same command with the same inputs. This is for --reproduce.
127 std::string elf::createResponseFile(const opt::InputArgList &Args) {
129 raw_svector_ostream OS(Data);
131 // Copy the command line to the output while rewriting paths.
132 for (auto *Arg : Args) {
133 switch (Arg->getOption().getID()) {
137 OS << quote(rewritePath(Arg->getValue())) << "\n";
140 case OPT_dynamic_list:
142 case OPT_alias_script_T:
144 case OPT_version_script:
145 OS << Arg->getSpelling() << " " << quote(rewritePath(Arg->getValue()))
149 OS << stringize(Arg) << "\n";
155 // Find a file by concatenating given paths. If a resulting path
156 // starts with "=", the character is replaced with a --sysroot value.
157 static Optional<std::string> findFile(StringRef Path1, const Twine &Path2) {
159 if (Path1.startswith("="))
160 path::append(S, Config->Sysroot, Path1.substr(1), Path2);
162 path::append(S, Path1, Path2);
165 return S.str().str();
169 Optional<std::string> elf::findFromSearchPaths(StringRef Path) {
170 for (StringRef Dir : Config->SearchPaths)
171 if (Optional<std::string> S = findFile(Dir, Path))
176 // This is for -lfoo. We'll look for libfoo.so or libfoo.a from
178 Optional<std::string> elf::searchLibrary(StringRef Name) {
179 if (Name.startswith(":"))
180 return findFromSearchPaths(Name.substr(1));
182 for (StringRef Dir : Config->SearchPaths) {
184 if (Optional<std::string> S = findFile(Dir, "lib" + Name + ".so"))
186 if (Optional<std::string> S = findFile(Dir, "lib" + Name + ".a"))