1 //===- DriverUtils.cpp ----------------------------------------------------===//
2 //
3 //                             The LLVM Linker
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
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.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #include "Driver.h"
17 #include "Error.h"
18 #include "llvm/ADT/STLExtras.h"
19 
20 using namespace llvm;
21 
22 using namespace lld;
23 using namespace lld::elf2;
24 
25 // Create OptTable
26 
27 // Create prefix string literals used in Options.td
28 #define PREFIX(NAME, VALUE) const char *const 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 infoTable[] = {
34 #define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10)            \
35   {                                                                            \
36     X1, X2, X9, X10, OPT_##ID, opt::Option::KIND##Class, X8, X7, OPT_##GROUP,  \
37         OPT_##ALIAS, X6                                                        \
38   }                                                                            \
39   ,
40 #include "Options.inc"
41 #undef OPTION
42 };
43 
44 class ELFOptTable : public opt::OptTable {
45 public:
46   ELFOptTable() : OptTable(infoTable, array_lengthof(infoTable)) {}
47 };
48 
49 // Parses a given list of options.
50 opt::InputArgList ArgParser::parse(ArrayRef<const char *> Argv) {
51   // Make InputArgList from string vectors.
52   ELFOptTable Table;
53   unsigned MissingIndex;
54   unsigned MissingCount;
55 
56   opt::InputArgList Args = Table.ParseArgs(Argv, MissingIndex, MissingCount);
57   if (MissingCount)
58     error(Twine("missing arg value for \"") + Args.getArgString(MissingIndex) +
59           "\", expected " + Twine(MissingCount) +
60           (MissingCount == 1 ? " argument.\n" : " arguments"));
61   for (auto *Arg : Args.filtered(OPT_UNKNOWN))
62     error(Twine("unknown argument: ") + Arg->getSpelling());
63   return Args;
64 }
65