gdb/type-stack.c

   1 /* Type stack for GDB parser.
   2
   3    Copyright (C) 1986-2019 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 "type-stack.h"
  22
  23 #include "gdbtypes.h"
  24 #include "parser-defs.h"
  25
  26 /* See type-stack.h.  */
  27
  28 void
  29 type_stack::insert (enum type_pieces tp)
  30 {
  31   union type_stack_elt element;
  32   int slot;
  33
  34   gdb_assert (tp == tp_pointer || tp == tp_reference
  35               || tp == tp_rvalue_reference || tp == tp_const
  36               || tp == tp_volatile);
  37
  38   /* If there is anything on the stack (we know it will be a
  39      tp_pointer), insert the qualifier above it.  Otherwise, simply
  40      push this on the top of the stack.  */
  41   if (!m_elements.empty () && (tp == tp_const || tp == tp_volatile))
  42     slot = 1;
  43   else
  44     slot = 0;
  45
  46   element.piece = tp;
  47   insert_into (slot, element);
  48 }
  49
  50 /* See type-stack.h.  */
  51
  52 void
  53 type_stack::insert (struct expr_builder *pstate, const char *string)
  54 {
  55   union type_stack_elt element;
  56   int slot;
  57
  58   /* If there is anything on the stack (we know it will be a
  59      tp_pointer), insert the address space qualifier above it.
  60      Otherwise, simply push this on the top of the stack.  */
  61   if (!m_elements.empty ())
  62     slot = 1;
  63   else
  64     slot = 0;
  65
  66   element.piece = tp_space_identifier;
  67   insert_into (slot, element);
  68   element.int_val = address_space_name_to_int (pstate->gdbarch (),
  69                                                string);
  70   insert_into (slot, element);
  71 }
  72
  73 /* See type-stack.h.  */
  74
  75 type_instance_flags
  76 type_stack::follow_type_instance_flags ()
  77 {
  78   type_instance_flags flags = 0;
  79
  80   for (;;)
  81     switch (pop ())
  82       {
  83       case tp_end:
  84         return flags;
  85       case tp_const:
  86         flags |= TYPE_INSTANCE_FLAG_CONST;
  87         break;
  88       case tp_volatile:
  89         flags |= TYPE_INSTANCE_FLAG_VOLATILE;
  90         break;
  91       default:
  92         gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
  93       }
  94 }
  95
  96 /* See type-stack.h.  */
  97
  98 struct type *
  99 type_stack::follow_types (struct type *follow_type)
 100 {
 101   int done = 0;
 102   int make_const = 0;
 103   int make_volatile = 0;
 104   int make_addr_space = 0;
 105   int array_size;
 106
 107   while (!done)
 108     switch (pop ())
 109       {
 110       case tp_end:
 111         done = 1;
 112         if (make_const)
 113           follow_type = make_cv_type (make_const,
 114                                       TYPE_VOLATILE (follow_type),
 115                                       follow_type, 0);
 116         if (make_volatile)
 117           follow_type = make_cv_type (TYPE_CONST (follow_type),
 118                                       make_volatile,
 119                                       follow_type, 0);
 120         if (make_addr_space)
 121           follow_type = make_type_with_address_space (follow_type,
 122                                                       make_addr_space);
 123         make_const = make_volatile = 0;
 124         make_addr_space = 0;
 125         break;
 126       case tp_const:
 127         make_const = 1;
 128         break;
 129       case tp_volatile:
 130         make_volatile = 1;
 131         break;
 132       case tp_space_identifier:
 133         make_addr_space = pop_int ();
 134         break;
 135       case tp_pointer:
 136         follow_type = lookup_pointer_type (follow_type);
 137         if (make_const)
 138           follow_type = make_cv_type (make_const,
 139                                       TYPE_VOLATILE (follow_type),
 140                                       follow_type, 0);
 141         if (make_volatile)
 142           follow_type = make_cv_type (TYPE_CONST (follow_type),
 143                                       make_volatile,
 144                                       follow_type, 0);
 145         if (make_addr_space)
 146           follow_type = make_type_with_address_space (follow_type,
 147                                                       make_addr_space);
 148         make_const = make_volatile = 0;
 149         make_addr_space = 0;
 150         break;
 151       case tp_reference:
 152          follow_type = lookup_lvalue_reference_type (follow_type);
 153          goto process_reference;
 154         case tp_rvalue_reference:
 155          follow_type = lookup_rvalue_reference_type (follow_type);
 156         process_reference:
 157          if (make_const)
 158            follow_type = make_cv_type (make_const,
 159                                        TYPE_VOLATILE (follow_type),
 160                                        follow_type, 0);
 161          if (make_volatile)
 162            follow_type = make_cv_type (TYPE_CONST (follow_type),
 163                                        make_volatile,
 164                                        follow_type, 0);
 165          if (make_addr_space)
 166            follow_type = make_type_with_address_space (follow_type,
 167                                                        make_addr_space);
 168         make_const = make_volatile = 0;
 169         make_addr_space = 0;
 170         break;
 171       case tp_array:
 172         array_size = pop_int ();
 173         /* FIXME-type-allocation: need a way to free this type when we are
 174            done with it.  */
 175         follow_type =
 176           lookup_array_range_type (follow_type,
 177                                    0, array_size >= 0 ? array_size - 1 : 0);
 178         if (array_size < 0)
 179           TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type))
 180             = PROP_UNDEFINED;
 181         break;
 182       case tp_function:
 183         /* FIXME-type-allocation: need a way to free this type when we are
 184            done with it.  */
 185         follow_type = lookup_function_type (follow_type);
 186         break;
 187
 188       case tp_function_with_arguments:
 189         {
 190           std::vector<struct type *> *args = pop_typelist ();
 191
 192           follow_type
 193             = lookup_function_type_with_arguments (follow_type,
 194                                                    args->size (),
 195                                                    args->data ());
 196         }
 197         break;
 198
 199       case tp_type_stack:
 200         {
 201           struct type_stack *stack = pop_type_stack ();
 202           follow_type = stack->follow_types (follow_type);
 203         }
 204         break;
 205       default:
 206         gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
 207       }
 208   return follow_type;
 209 }