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 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #else
  29 # include "php_config.h"
  30 #endif
  31 #include "data.h"
  32
  33 #include <assert.h>
  34
  35 struct psi_decl_union* psi_decl_union_init(zend_string *name,
  36                 struct psi_plist *args)
  37 {
  38         struct psi_decl_union *u = pecalloc(1, sizeof(*u), 1);
  39         u->name = zend_string_copy(name);
  40         u->args = args;
  41         return u;
  42 }
  43
  44 void psi_decl_union_free(struct psi_decl_union **u_ptr)
  45 {
  46         if (*u_ptr) {
  47                 struct psi_decl_union *u = *u_ptr;
  48
  49                 *u_ptr = NULL;
  50                 psi_token_free(&u->token);
  51                 if (u->args) {
  52                         psi_plist_free(u->args);
  53                 }
  54                 zend_string_release(u->name);
  55                 free(u);
  56         }
  57 }
  58
  59 void psi_decl_union_dump(struct psi_dump *dump, struct psi_decl_union *unn)
  60 {
  61         PSI_DUMP(dump, "union %s::(%zu, %zu)", unn->name->val, unn->align, unn->size);
  62         if (psi_plist_count(unn->args)) {
  63                 psi_decl_type_dump_args_with_layout(dump, unn->args, 0);
  64         } else {
  65                 PSI_DUMP(dump, ";");
  66         }
  67 }
  68
  69 struct psi_decl_arg *psi_decl_union_get_arg(struct psi_decl_union *u,
  70                 struct psi_decl_var *var)
  71 {
  72         if (u->args) {
  73                 return psi_decl_arg_get_by_var(var, u->args, NULL);
  74         }
  75
  76         return NULL;
  77 }
  78
  79 bool psi_decl_union_validate(struct psi_data *data, struct psi_decl_union *u,
  80                 struct psi_validate_scope *scope)
  81 {
  82         size_t i, pos, len, size = 0, align;
  83         struct psi_decl_arg *darg;
  84
  85         if (psi_validate_scope_has_union(scope, u->name)) {
  86                 return true;
  87         }
  88
  89         if (!u->size && !psi_plist_count(u->args)) {
  90                 data->error(data, u->token, PSI_WARNING,
  91                                 "Cannot compute size of empty union %s", u->name->val);
  92                 return false;
  93         }
  94
  95         psi_validate_scope_add_union(scope, u->name, u);
  96
  97         for (i = 0; psi_plist_get(u->args, i, &darg); ++i) {
  98                 darg->var->arg = darg;
  99
 100                 if (!psi_decl_arg_validate(data, darg, scope)) {
 101                         psi_validate_scope_del_union(scope, u->name);
 102                         return false;
 103                 }
 104
 105                 if (darg->layout && darg->layout->len) {
 106                         pos = darg->layout->pos;
 107
 108                         align = psi_decl_arg_align(darg, &pos, &len);
 109
 110                         if (darg->layout->pos != 0) {
 111                                 data->error(data, darg->token, PSI_WARNING,
 112                                                 "Offset of %s.%s should be 0", u->name->val,
 113                                                 darg->var->name->val);
 114                                 darg->layout->pos = 0;
 115                         }
 116                         if (darg->layout->len != len) {
 117                                 data->error(data, darg->token, PSI_WARNING,
 118                                                 "Computed size %zu of %s.%s does not match"
 119                                                 " pre-defined size %zu of type '%s'",
 120                                                 len, u->name->val, darg->var->name->val,
 121                                                 darg->layout->len, darg->type->name->val);
 122                         }
 123                 } else {
 124                         pos = 0;
 125
 126                         align = psi_decl_arg_align(darg, &pos, &len);
 127
 128                         if (darg->layout) {
 129                                 if (darg->layout->pos != 0) {
 130                                         data->error(data, darg->token, PSI_WARNING,
 131                                                         "Offset of %s.%s should be 0", u->name->val,
 132                                                         darg->var->name->val);
 133                                         darg->layout->pos = 0;
 134                                 }
 135                                 darg->layout->len = len;
 136                         } else {
 137                                 darg->layout = psi_layout_init(pos, len, NULL);
 138                         }
 139                 }
 140                 if (len > size) {
 141                         size = len;
 142                 }
 143                 if (align > u->align) {
 144                         u->align = align;
 145                 }
 146         }
 147
 148         psi_plist_sort(u->args, psi_layout_sort_cmp, NULL);
 149
 150         if (u->size < size) {
 151                 u->size = psi_align(size, u->align);
 152         }
 153
 154         assert(u->size);
 155
 156         return true;
 157 }
 158
 159 size_t psi_decl_union_get_align(struct psi_decl_union *u)
 160 {
 161         if (!u->align) {
 162                 u->align = psi_decl_type_get_args_align(u->args);
 163         }
 164         return u->align;
 165 }