Line data    Source code

       1              : /* C++ wrapper around libiberty's pex API.
       2              :    Copyright (C) 2025-2026 Free Software Foundation, Inc.
       3              :    Contributed by David Malcolm <dmalcolm@redhat.com>.
       4              : 
       5              : This file is part of GCC.
       6              : 
       7              : GCC is free software; you can redistribute it and/or modify it
       8              : under the terms of the GNU General Public License as published by
       9              : the Free Software Foundation; either version 3, or (at your option)
      10              : any later version.
      11              : 
      12              : GCC is distributed in the hope that it will be useful, but
      13              : WITHOUT ANY WARRANTY; without even the implied warranty of
      14              : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15              : General Public License for more details.
      16              : 
      17              : You should have received a copy of the GNU General Public License
      18              : along with GCC; see the file COPYING3.  If not see
      19              : <http://www.gnu.org/licenses/>.  */
      20              : 
      21              : #define INCLUDE_STRING
      22              : #define INCLUDE_VECTOR
      23              : #include "config.h"
      24              : #include "system.h"
      25              : #include "coretypes.h"
      26              : #include "pex.h"
      27              : 
      28              : /* Read the contents of FILE into memory, or return nullptr
      29              :    if there are any problems.  */
      30              : 
      31              : static std::unique_ptr<std::vector<char>>
      32           49 : read_all_of_file (FILE *f_in)
      33              : {
      34              :   /* Read content, allocating a buffer for it.  */
      35           49 :   auto result = std::make_unique<std::vector<char>> ();
      36           49 :   char buf[4096];
      37           49 :   size_t iter_sz_in;
      38              : 
      39          322 :   while ( (iter_sz_in = fread (buf, 1, sizeof (buf), f_in)) )
      40              :     {
      41          224 :       size_t old_total_sz = result->size ();
      42          224 :       size_t new_total_sz = old_total_sz + iter_sz_in;
      43          224 :       size_t old_alloc_sz = result->capacity ();
      44          224 :       if (new_total_sz > old_alloc_sz)
      45              :         {
      46          144 :           size_t new_alloc_sz = std::max (old_alloc_sz * 2, new_total_sz);
      47          144 :           result->reserve (new_alloc_sz);
      48              :         }
      49          224 :       gcc_assert (result->capacity () >= new_total_sz);
      50          224 :       result->resize (new_total_sz);
      51          224 :       memcpy (result->data () + old_total_sz, buf, iter_sz_in);
      52              :     }
      53              : 
      54           49 :   if (!feof (f_in))
      55            0 :     return nullptr;
      56              : 
      57           49 :   return result;
      58           49 : }
      59              : 
      60              : // struct file_wrapper
      61              : 
      62              : std::unique_ptr<std::vector<char>>
      63           49 : file_wrapper::read_all ()
      64              : {
      65           49 :   return read_all_of_file (m_file);
      66              : }
      67              : 
      68              : // struct pex
      69              : 
      70              : const char *
      71           49 : pex::run (int flags, const char *executable, const std::vector<std::string> &args,
      72              :           const char *outname, const char *errname, int *err)
      73              : {
      74           49 :   std::vector<char *> argv;
      75          147 :   for (auto &iter : args)
      76           98 :     argv.push_back (const_cast<char *> (iter.c_str ()));
      77           49 :   argv.push_back (nullptr);
      78           49 :   return pex_run (m_obj, flags, executable, argv.data (),
      79           49 :                   outname, errname, err);
      80           49 : }