gdb/compile/compile-object-run.c

   1 /* Call module for 'compile' command.
   2
   3    Copyright (C) 2014-2016 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   /* Boolean to set true upon a call of do_module_cleanup.
  36      The pointer may be NULL.  */
  37   int *executedp;
  38
  39   /* .c file OBJFILE was built from.  It needs to be xfree-d.  */
  40   char *source_file;
  41
  42   /* Copy from struct compile_module.  */
  43   enum compile_i_scope_types scope;
  44   void *scope_data;
  45
  46   /* Copy from struct compile_module.  */
  47   struct type *out_value_type;
  48   CORE_ADDR out_value_addr;
  49
  50   /* Copy from struct compile_module.  */
  51   struct munmap_list *munmap_list_head;
  52
  53   /* objfile_name of our objfile.  */
  54   char objfile_name_string[1];
  55 };
  56
  57 /* Cleanup everything after the inferior function dummy frame gets
  58    discarded.  */
  59
  60 static dummy_frame_dtor_ftype do_module_cleanup;
  61 static void
  62 do_module_cleanup (void *arg, int registers_valid)
  63 {
  64   struct do_module_cleanup *data = (struct do_module_cleanup *) arg;
  65   struct objfile *objfile;
  66
  67   if (data->executedp != NULL)
  68     {
  69       *data->executedp = 1;
  70
  71       /* This code cannot be in compile_object_run as OUT_VALUE_TYPE
  72          no longer exists there.  */
  73       if (data->scope == COMPILE_I_PRINT_ADDRESS_SCOPE
  74           || data->scope == COMPILE_I_PRINT_VALUE_SCOPE)
  75         {
  76           struct value *addr_value;
  77           struct type *ptr_type = lookup_pointer_type (data->out_value_type);
  78
  79           addr_value = value_from_pointer (ptr_type, data->out_value_addr);
  80
  81           /* SCOPE_DATA would be stale unlesse EXECUTEDP != NULL.  */
  82           compile_print_value (value_ind (addr_value), data->scope_data);
  83         }
  84     }
  85
  86   ALL_OBJFILES (objfile)
  87     if ((objfile->flags & OBJF_USERLOADED) == 0
  88         && (strcmp (objfile_name (objfile), data->objfile_name_string) == 0))
  89       {
  90         free_objfile (objfile);
  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->source_file);
 100   xfree (data->source_file);
 101
 102   munmap_list_free (data->munmap_list_head);
 103
 104   /* Delete the .o file.  */
 105   unlink (data->objfile_name_string);
 106   xfree (data);
 107 }
 108
 109 /* Perform inferior call of MODULE.  This function may throw an error.
 110    This function may leave files referenced by MODULE on disk until
 111    the inferior call dummy frame is discarded.  This function may throw errors.
 112    Thrown errors and left MODULE files are unrelated events.  Caller must no
 113    longer touch MODULE's memory after this function has been called.  */
 114
 115 void
 116 compile_object_run (struct compile_module *module)
 117 {
 118   struct value *func_val;
 119   struct frame_id dummy_id;
 120   struct cleanup *cleanups;
 121   struct do_module_cleanup *data;
 122   const char *objfile_name_s = objfile_name (module->objfile);
 123   int dtor_found, executed = 0;
 124   struct symbol *func_sym = module->func_sym;
 125   CORE_ADDR regs_addr = module->regs_addr;
 126   struct objfile *objfile = module->objfile;
 127
 128   data = (struct do_module_cleanup *) xmalloc (sizeof (*data)
 129                                                + strlen (objfile_name_s));
 130   data->executedp = &executed;
 131   data->source_file = xstrdup (module->source_file);
 132   strcpy (data->objfile_name_string, objfile_name_s);
 133   data->scope = module->scope;
 134   data->scope_data = module->scope_data;
 135   data->out_value_type = module->out_value_type;
 136   data->out_value_addr = module->out_value_addr;
 137   data->munmap_list_head = module->munmap_list_head;
 138
 139   xfree (module->source_file);
 140   xfree (module);
 141   module = NULL;
 142
 143   TRY
 144     {
 145       struct type *func_type = SYMBOL_TYPE (func_sym);
 146       htab_t copied_types;
 147       int current_arg = 0;
 148       struct value **vargs;
 149
 150       /* OBJFILE may disappear while FUNC_TYPE still will be in use.  */
 151       copied_types = create_copied_types_hash (objfile);
 152       func_type = copy_type_recursive (objfile, func_type, copied_types);
 153       htab_delete (copied_types);
 154
 155       gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
 156       func_val = value_from_pointer (lookup_pointer_type (func_type),
 157                                    BLOCK_START (SYMBOL_BLOCK_VALUE (func_sym)));
 158
 159       vargs = XALLOCAVEC (struct value *, TYPE_NFIELDS (func_type));
 160       if (TYPE_NFIELDS (func_type) >= 1)
 161         {
 162           gdb_assert (regs_addr != 0);
 163           vargs[current_arg] = value_from_pointer
 164                           (TYPE_FIELD_TYPE (func_type, current_arg), regs_addr);
 165           ++current_arg;
 166         }
 167       if (TYPE_NFIELDS (func_type) >= 2)
 168         {
 169           gdb_assert (data->out_value_addr != 0);
 170           vargs[current_arg] = value_from_pointer
 171                (TYPE_FIELD_TYPE (func_type, current_arg), data->out_value_addr);
 172           ++current_arg;
 173         }
 174       gdb_assert (current_arg == TYPE_NFIELDS (func_type));
 175       call_function_by_hand_dummy (func_val, TYPE_NFIELDS (func_type), vargs,
 176                                    do_module_cleanup, data);
 177     }
 178   CATCH (ex, RETURN_MASK_ERROR)
 179     {
 180       /* In the case of DTOR_FOUND or in the case of EXECUTED nothing
 181          needs to be done.  */
 182       dtor_found = find_dummy_frame_dtor (do_module_cleanup, data);
 183       if (!executed)
 184         data->executedp = NULL;
 185       gdb_assert (!(dtor_found && executed));
 186       if (!dtor_found && !executed)
 187         do_module_cleanup (data, 0);
 188       throw_exception (ex);
 189     }
 190   END_CATCH
 191
 192   dtor_found = find_dummy_frame_dtor (do_module_cleanup, data);
 193   gdb_assert (!dtor_found && executed);
 194 }