gdb/compile/compile-object-run.c

   1 /* Call module for 'compile' command.
   2
   3    Copyright (C) 2014-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "compile-object-run.h"
  22 #include "value.h"
  23 #include "infcall.h"
  24 #include "objfiles.h"
  25 #include "compile-internal.h"
  26 #include "dummy-frame.h"
  27 #include "block.h"
  28 #include "valprint.h"
  29 #include "compile.h"
  30
  31 /* Helper for do_module_cleanup.  */
  32
  33 struct do_module_cleanup
  34 {
  35   do_module_cleanup (int *ptr, compile_module_up &&mod)
  36     : executedp (ptr),
  37       module (std::move (mod))
  38   {
  39   }
  40
  41   DISABLE_COPY_AND_ASSIGN (do_module_cleanup);
  42
  43   /* Boolean to set true upon a call of do_module_cleanup.
  44      The pointer may be NULL.  */
  45   int *executedp;
  46
  47   /* The compile module.  */
  48   compile_module_up module;
  49 };
  50
  51 /* Cleanup everything after the inferior function dummy frame gets
  52    discarded.  */
  53
  54 static dummy_frame_dtor_ftype do_module_cleanup;
  55 static void
  56 do_module_cleanup (void *arg, int registers_valid)
  57 {
  58   struct do_module_cleanup *data = (struct do_module_cleanup *) arg;
  59
  60   if (data->executedp != NULL)
  61     {
  62       *data->executedp = 1;
  63
  64       /* This code cannot be in compile_object_run as OUT_VALUE_TYPE
  65          no longer exists there.  */
  66       if (data->module->scope == COMPILE_I_PRINT_ADDRESS_SCOPE
  67           || data->module->scope == COMPILE_I_PRINT_VALUE_SCOPE)
  68         {
  69           struct value *addr_value;
  70           struct type *ptr_type
  71             = lookup_pointer_type (data->module->out_value_type);
  72
  73           addr_value = value_from_pointer (ptr_type,
  74                                            data->module->out_value_addr);
  75
  76           /* SCOPE_DATA would be stale unless EXECUTEDP != NULL.  */
  77           compile_print_value (value_ind (addr_value),
  78                                data->module->scope_data);
  79         }
  80     }
  81
  82   /* We have to make a copy of the name so that we can unlink the
  83      underlying file -- removing the objfile will cause the name to be
  84      freed, so we can't simply keep a reference to it.  */
  85   std::string objfile_name_s = objfile_name (data->module->objfile);
  86   for (objfile *objfile : current_program_space->objfiles ())
  87     if ((objfile->flags & OBJF_USERLOADED) == 0
  88         && objfile_name_s == objfile_name (objfile))
  89       {
  90         objfile->unlink ();
  91
  92         /* It may be a bit too pervasive in this dummy_frame dtor callback.  */
  93         clear_symtab_users (0);
  94
  95         break;
  96       }
  97
  98   /* Delete the .c file.  */
  99   unlink (data->module->source_file.c_str ());
 100
 101   /* Delete the .o file.  */
 102   unlink (objfile_name_s.c_str ());
 103
 104   delete data;
 105 }
 106
 107 /* Create a copy of FUNC_TYPE that is independent of OBJFILE.  */
 108
 109 static type *
 110 create_copied_type_recursive (objfile *objfile, type *func_type)
 111 {
 112   htab_up copied_types = create_copied_types_hash (objfile);
 113   func_type = copy_type_recursive (objfile, func_type, copied_types.get ());
 114   return func_type;
 115 }
 116
 117 /* Perform inferior call of MODULE.  This function may throw an error.
 118    This function may leave files referenced by MODULE on disk until
 119    the inferior call dummy frame is discarded.  This function may throw errors.
 120    Thrown errors and left MODULE files are unrelated events.  Caller must no
 121    longer touch MODULE's memory after this function has been called.  */
 122
 123 void
 124 compile_object_run (compile_module_up &&module)
 125 {
 126   struct value *func_val;
 127   struct do_module_cleanup *data;
 128   int dtor_found, executed = 0;
 129   struct symbol *func_sym = module->func_sym;
 130   CORE_ADDR regs_addr = module->regs_addr;
 131   struct objfile *objfile = module->objfile;
 132
 133   data = new struct do_module_cleanup (&executed, std::move (module));
 134
 135   try
 136     {
 137       struct type *func_type = SYMBOL_TYPE (func_sym);
 138       int current_arg = 0;
 139       struct value **vargs;
 140
 141       /* OBJFILE may disappear while FUNC_TYPE is still in use as a
 142          result of the call to DO_MODULE_CLEANUP below, so we need a copy
 143          that does not depend on the objfile in anyway.  */
 144       func_type = create_copied_type_recursive (objfile, func_type);
 145
 146       gdb_assert (func_type->code () == TYPE_CODE_FUNC);
 147       func_val = value_from_pointer (lookup_pointer_type (func_type),
 148                                    BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (func_sym)));
 149
 150       vargs = XALLOCAVEC (struct value *, func_type->num_fields ());
 151       if (func_type->num_fields () >= 1)
 152         {
 153           gdb_assert (regs_addr != 0);
 154           vargs[current_arg] = value_from_pointer
 155                           (func_type->field (current_arg).type (), regs_addr);
 156           ++current_arg;
 157         }
 158       if (func_type->num_fields () >= 2)
 159         {
 160           gdb_assert (data->module->out_value_addr != 0);
 161           vargs[current_arg] = value_from_pointer
 162                (func_type->field (current_arg).type (),
 163                 data->module->out_value_addr);
 164           ++current_arg;
 165         }
 166       gdb_assert (current_arg == func_type->num_fields ());
 167       auto args = gdb::make_array_view (vargs, func_type->num_fields ());
 168       call_function_by_hand_dummy (func_val, NULL, args,
 169                                    do_module_cleanup, data);
 170     }
 171   catch (const gdb_exception_error &ex)
 172     {
 173       /* In the case of DTOR_FOUND or in the case of EXECUTED nothing
 174          needs to be done.  */
 175       dtor_found = find_dummy_frame_dtor (do_module_cleanup, data);
 176       if (!executed)
 177         data->executedp = NULL;
 178       gdb_assert (!(dtor_found && executed));
 179       if (!dtor_found && !executed)
 180         do_module_cleanup (data, 0);
 181       throw;
 182     }
 183
 184   dtor_found = find_dummy_frame_dtor (do_module_cleanup, data);
 185   gdb_assert (!dtor_found && executed);
 186 }