git.m6w6.name Git - m6w6/ext-psi/blob - src/types/decl_union.c

   1 /*******************************************************************************
   2  Copyright (c) 2016, Michael Wallner <mike@php.net>.
   3  All rights reserved.
   4
   5  Redistribution and use in source and binary forms, with or without
   6  modification, are permitted provided that the following conditions are met:
   7
   8  * Redistributions of source code must retain the above copyright notice,
   9  this list of conditions and the following disclaimer.
  10  * Redistributions in binary form must reproduce the above copyright
  11  notice, this list of conditions and the following disclaimer in the
  12  documentation and/or other materials provided with the distribution.
  13
  14  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  15  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  18  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  20  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  21  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  22  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *******************************************************************************/
  25
  26 #include "php_psi_stdinc.h"
  27 #include "data.h"
  28
  29 #include <assert.h>
  30
  31 struct psi_decl_union* psi_decl_union_init(const char *name,
  32                 struct psi_plist *args)
  33 {
  34         struct psi_decl_union *u = calloc(1, sizeof(*u));
  35         u->name = strdup(name);
  36         u->args = args;
  37         return u;
  38 }
  39
  40 void psi_decl_union_free(struct psi_decl_union **u_ptr)
  41 {
  42         if (*u_ptr) {
  43                 struct psi_decl_union *u = *u_ptr;
  44
  45                 *u_ptr = NULL;
  46                 if (u->token) {
  47                         free(u->token);
  48                 }
  49                 if (u->args) {
  50                         psi_plist_free(u->args);
  51                 }
  52                 free(u->name);
  53                 free(u);
  54         }
  55 }
  56
  57 void psi_decl_union_dump(int fd, struct psi_decl_union *unn)
  58 {
  59         dprintf(fd, "union %s::(%zu, %zu)", unn->name, unn->align, unn->size);
  60         if (psi_plist_count(unn->args)) {
  61                 psi_decl_type_dump_args_with_layout(fd, unn->args, 0);
  62         } else {
  63                 dprintf(fd, ";");
  64         }
  65 }
  66
  67 struct psi_decl_arg *psi_decl_union_get_arg(struct psi_decl_union *u,
  68                 struct psi_decl_var *var)
  69 {
  70         if (u->args) {
  71                 return psi_decl_arg_get_by_var(var, u->args, NULL);
  72         }
  73
  74         return NULL;
  75 }
  76
  77 bool psi_decl_union_validate(struct psi_data *data, struct psi_decl_union *u,
  78                 struct psi_validate_scope *scope)
  79 {
  80         size_t i, pos, len, size = 0, align;
  81         struct psi_decl_arg *darg;
  82
  83         if (psi_validate_scope_has_union(scope, u->name)) {
  84                 return true;
  85         }
  86
  87         if (!u->size && !psi_plist_count(u->args)) {
  88                 data->error(data, u->token, PSI_WARNING,
  89                                 "Cannot compute size of empty union %s", u->name);
  90                 return false;
  91         }
  92
  93         psi_validate_scope_add_union(scope, u->name, u);
  94
  95         for (i = 0; psi_plist_get(u->args, i, &darg); ++i) {
  96                 darg->var->arg = darg;
  97
  98                 if (!psi_decl_arg_validate(data, darg, scope)) {
  99                         psi_validate_scope_del_union(scope, u->name);
 100                         return false;
 101                 }
 102
 103                 if (darg->layout && darg->layout->len) {
 104                         pos = darg->layout->pos;
 105
 106                         align = psi_decl_arg_align(darg, &pos, &len);
 107
 108                         if (darg->layout->pos != 0) {
 109                                 data->error(data, darg->token, PSI_WARNING,
 110                                                 "Offset of %s.%s should be 0", u->name,
 111                                                 darg->var->name);
 112                                 darg->layout->pos = 0;
 113                         }
 114                         if (darg->layout->len != len) {
 115                                 data->error(data, darg->token, PSI_WARNING,
 116                                                 "Computed size %zu of %s.%s does not match"
 117                                                 " pre-defined size %zu of type '%s'",
 118                                                 len, u->name, darg->var->name, darg->layout->len,
 119                                                 darg->type->name);
 120                         }
 121                 } else {
 122                         pos = 0;
 123
 124                         align = psi_decl_arg_align(darg, &pos, &len);
 125
 126                         if (darg->layout) {
 127                                 if (darg->layout->pos != 0) {
 128                                         data->error(data, darg->token, PSI_WARNING,
 129                                                         "Offset of %s.%s should be 0", u->name,
 130                                                         darg->var->name);
 131                                         darg->layout->pos = 0;
 132                                 }
 133                                 darg->layout->len = len;
 134                         } else {
 135                                 darg->layout = psi_layout_init(pos, len, NULL);
 136                         }
 137                 }
 138                 if (len > size) {
 139                         size = len;
 140                 }
 141                 if (align > u->align) {
 142                         u->align = align;
 143                 }
 144         }
 145
 146         psi_plist_sort(u->args, psi_layout_sort_cmp, NULL);
 147
 148         if (u->size < size) {
 149                 u->size = psi_align(size, u->align);
 150         }
 151
 152         assert(u->size);
 153
 154         return true;
 155 }
 156
 157 size_t psi_decl_union_get_align(struct psi_decl_union *u)
 158 {
 159         if (!u->align) {
 160                 u->align = psi_decl_type_get_args_align(u->args);
 161         }
 162         return u->align;
 163 }