gcc/rust/rustspec.cc

   1 /* rustspec.c -- Specific flags and argument handling of the gcc Rust front end.
   2    Copyright (C) 2009-2024 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "opts.h"
  25
  26 // satisfy intellisense
  27 #include "options.h"
  28
  29 /* This bit is set if we saw a `-xfoo' language specification.  */
  30 #define LANGSPEC (1 << 1)
  31 /* This bit is set if they did `-lc'.  */
  32 #define WITHLIBC (1 << 2)
  33 /* Skip this option.  */
  34 #define SKIPOPT (1 << 3)
  35
  36 void
  37 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
  38                       unsigned int *in_decoded_options_count,
  39                       int *in_added_libraries)
  40 {
  41   unsigned int i, j;
  42
  43   /* The new argument list will be contained in this.  */
  44   struct cl_decoded_option *new_decoded_options;
  45
  46   /* "-lc" if it appears on the command line.  */
  47   const struct cl_decoded_option *saw_libc = 0;
  48
  49   /* An array used to flag each argument that needs a bit set for
  50      LANGSPEC or WITHLIBC.  */
  51   int *args;
  52
  53   /* True if we saw -static.  */
  54   int static_link = 0;
  55
  56   /* True if we should add -shared-libgcc to the command-line.  */
  57   int shared_libgcc = 1;
  58
  59   /* The total number of arguments with the new stuff.  */
  60   unsigned int argc;
  61
  62   /* The argument list.  */
  63   struct cl_decoded_option *decoded_options;
  64
  65   /* The number of libraries added in.  */
  66   int added_libraries;
  67
  68   /* The total number of arguments with the new stuff.  */
  69   int num_args = 1;
  70
  71   /* Whether the -o option was used.  */
  72   bool saw_opt_o = false;
  73
  74   /* The first input file with an extension of .rs.  */
  75   const char *first_rust_file = NULL;
  76
  77   argc = *in_decoded_options_count;
  78   decoded_options = *in_decoded_options;
  79   added_libraries = *in_added_libraries;
  80
  81   args = XCNEWVEC (int, argc);
  82
  83   for (i = 1; i < argc; i++)
  84     {
  85       const char *arg = decoded_options[i].arg;
  86
  87       switch (decoded_options[i].opt_index)
  88         {
  89         case OPT_l:
  90           if (strcmp (arg, "c") == 0)
  91             args[i] |= WITHLIBC;
  92           break;
  93
  94         case OPT_o:
  95           saw_opt_o = true;
  96           break;
  97
  98         case OPT_static:
  99           static_link = 1;
 100           break;
 101
 102         case OPT_static_libgcc:
 103           shared_libgcc = 0;
 104           break;
 105
 106         case OPT_SPECIAL_input_file:
 107           if (first_rust_file == NULL)
 108             {
 109               int len;
 110
 111               len = strlen (arg);
 112               if (len > 3 && strcmp (arg + len - 3, ".rs") == 0)
 113                 first_rust_file = arg;
 114             }
 115           else
 116             {
 117               // FIXME: ARTHUR: Do we want to error here? If there's already one
 118               // file?
 119               // How do we error here? Do we want to instead just handle that in
 120               // the session manager?
 121             }
 122
 123           break;
 124         }
 125     }
 126
 127     /* There's no point adding -shared-libgcc if we don't have a shared
 128        libgcc.  */
 129 #ifndef ENABLE_SHARED_LIBGCC
 130   shared_libgcc = 0;
 131 #endif
 132
 133   /* Make sure to have room for the trailing NULL argument.  */
 134   num_args = argc + shared_libgcc * 5 + 10;
 135   new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
 136
 137   i = 0;
 138   j = 0;
 139
 140   /* Copy the 0th argument, i.e., the name of the program itself.  */
 141   new_decoded_options[j++] = decoded_options[i++];
 142
 143   /* NOTE: We start at 1 now, not 0.  */
 144   while (i < argc)
 145     {
 146       new_decoded_options[j] = decoded_options[i];
 147
 148       if (!saw_libc && (args[i] & WITHLIBC))
 149         {
 150           --j;
 151           saw_libc = &decoded_options[i];
 152         }
 153
 154       if ((args[i] & SKIPOPT) != 0)
 155         --j;
 156
 157       i++;
 158       j++;
 159     }
 160
 161   /* If we didn't see a -o option, add one.  This is because we need
 162      the driver to pass all .rs files to rust1.  Without a -o option the
 163      driver will invoke rust1 separately for each input file.  FIXME:
 164      This should probably use some other interface to force the driver
 165      to set combine_inputs.  */
 166   if (!saw_opt_o)
 167     {
 168       generate_option (OPT_o, "a.out", 1, CL_DRIVER, &new_decoded_options[j]);
 169       j++;
 170     }
 171
 172   if (saw_libc)
 173     new_decoded_options[j++] = *saw_libc;
 174   if (shared_libgcc && !static_link)
 175     generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
 176                      &new_decoded_options[j++]);
 177
 178   *in_decoded_options_count = j;
 179   *in_decoded_options = new_decoded_options;
 180   *in_added_libraries = added_libraries;
 181 }
 182
 183 /* Called before linking.  Returns 0 on success and -1 on failure.  */
 184 int
 185 lang_specific_pre_link (void) /* Not used for Rust.  */
 186 {
 187   return 0;
 188 }
 189
 190 /* Number of extra output files that lang_specific_pre_link may generate.  */
 191 int lang_specific_extra_outfiles = 0; /* Not used for Rust.  */