1 //===- DriverUtils.cpp ----------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "Driver.h"
10 #include "InputFiles.h"
11 
12 #include "lld/Common/ErrorHandler.h"
13 #include "lld/Common/Memory.h"
14 #include "llvm/Option/Arg.h"
15 #include "llvm/Option/ArgList.h"
16 #include "llvm/Option/Option.h"
17 #include "llvm/Support/Path.h"
18 #include "llvm/TextAPI/MachO/TextAPIReader.h"
19 
20 using namespace llvm;
21 using namespace llvm::MachO;
22 using namespace llvm::opt;
23 using namespace llvm::sys;
24 using namespace lld;
25 using namespace lld::macho;
26 
27 // Create prefix string literals used in Options.td
28 #define PREFIX(NAME, VALUE) const char *NAME[] = VALUE;
29 #include "Options.inc"
30 #undef PREFIX
31 
32 // Create table mapping all options defined in Options.td
33 static const opt::OptTable::Info optInfo[] = {
34 #define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X7, X8, X9, X10, X11, X12)      \
35   {X1, X2, X10,         X11,         OPT_##ID, opt::Option::KIND##Class,       \
36    X9, X8, OPT_##GROUP, OPT_##ALIAS, X7,       X12},
37 #include "Options.inc"
38 #undef OPTION
39 };
40 
41 MachOOptTable::MachOOptTable() : OptTable(optInfo) {}
42 
43 // Set color diagnostics according to --color-diagnostics={auto,always,never}
44 // or --no-color-diagnostics flags.
45 static void handleColorDiagnostics(opt::InputArgList &args) {
46   auto *arg = args.getLastArg(OPT_color_diagnostics, OPT_color_diagnostics_eq,
47                               OPT_no_color_diagnostics);
48   if (!arg)
49     return;
50   if (arg->getOption().getID() == OPT_color_diagnostics) {
51     lld::errs().enable_colors(true);
52   } else if (arg->getOption().getID() == OPT_no_color_diagnostics) {
53     lld::errs().enable_colors(false);
54   } else {
55     StringRef s = arg->getValue();
56     if (s == "always")
57       lld::errs().enable_colors(true);
58     else if (s == "never")
59       lld::errs().enable_colors(false);
60     else if (s != "auto")
61       error("unknown option: --color-diagnostics=" + s);
62   }
63 }
64 
65 opt::InputArgList MachOOptTable::parse(ArrayRef<const char *> argv) {
66   // Make InputArgList from string vectors.
67   unsigned missingIndex;
68   unsigned missingCount;
69   SmallVector<const char *, 256> vec(argv.data(), argv.data() + argv.size());
70 
71   opt::InputArgList args = ParseArgs(vec, missingIndex, missingCount);
72 
73   if (missingCount)
74     error(Twine(args.getArgString(missingIndex)) + ": missing argument");
75 
76   handleColorDiagnostics(args);
77 
78   for (opt::Arg *arg : args.filtered(OPT_UNKNOWN)) {
79     std::string nearest;
80     if (findNearest(arg->getAsString(args), nearest) > 1)
81       error("unknown argument '" + arg->getAsString(args) + "'");
82     else
83       error("unknown argument '" + arg->getAsString(args) +
84             "', did you mean '" + nearest + "'");
85   }
86   return args;
87 }
88 
89 void MachOOptTable::printHelp(const char *argv0, bool showHidden) const {
90   PrintHelp(lld::outs(), (std::string(argv0) + " [options] file...").c_str(),
91             "LLVM Linker", showHidden);
92   lld::outs() << "\n";
93 }
94 
95 Optional<std::string> macho::resolveDylibPath(StringRef path) {
96   // TODO: if a tbd and dylib are both present, we should check to make sure
97   // they are consistent.
98   if (fs::exists(path))
99     return std::string(path);
100 
101   SmallString<261> location = path;
102   path::replace_extension(location, ".tbd");
103   if (fs::exists(location))
104     return std::string(location);
105 
106   return {};
107 }
108 
109 Optional<DylibFile *> macho::makeDylibFromTAPI(MemoryBufferRef mbref,
110                                                DylibFile *umbrella) {
111   Expected<std::unique_ptr<InterfaceFile>> result = TextAPIReader::get(mbref);
112   if (!result) {
113     error("could not load TAPI file at " + mbref.getBufferIdentifier() + ": " +
114           toString(result.takeError()));
115     return {};
116   }
117   return make<DylibFile>(**result, umbrella);
118 }
119