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 {
  79         size_t i, pos, len, size = 0, align;
  80         struct psi_decl_arg *darg;
  81
  82         if (!u->size && !psi_plist_count(u->args)) {
  83                 data->error(data, u->token, PSI_WARNING,
  84                                 "Cannot compute size of empty union %s", u->name);
  85                 return false;
  86         }
  87
  88         for (i = 0; psi_plist_get(u->args, i, &darg); ++i) {
  89                 darg->var->arg = darg;
  90
  91                 if (!psi_decl_arg_validate(data, darg)) {
  92                         return false;
  93                 }
  94
  95                 if (darg->layout) {
  96                         pos = darg->layout->pos;
  97
  98                         align = psi_decl_arg_align(darg, &pos, &len);
  99
 100                         if (darg->layout->pos != 0) {
 101                                 data->error(data, darg->token, PSI_WARNING,
 102                                                 "Offset of %s.%s should be 0", u->name,
 103                                                 darg->var->name);
 104                                 darg->layout->pos = 0;
 105                         }
 106                         if (darg->layout->len != len) {
 107                                 data->error(data, darg->token, PSI_WARNING,
 108                                                 "Computed size %zu of %s.%s does not match"
 109                                                 " pre-defined size %zu of type '%s'",
 110                                                 len, u->name, darg->var->name, darg->layout->len,
 111                                                 darg->type->name);
 112                         }
 113                 } else {
 114                         pos = 0;
 115
 116                         align = psi_decl_arg_align(darg, &pos, &len);
 117                         darg->layout = psi_layout_init(pos, len);
 118                 }
 119                 if (len > size) {
 120                         size = len;
 121                 }
 122                 if (align > u->align) {
 123                         u->align = align;
 124                 }
 125         }
 126
 127         psi_plist_sort(u->args, psi_layout_sort_cmp, NULL);
 128
 129         if (u->size < size) {
 130                 u->size = psi_align(size, u->align);
 131         }
 132
 133         return true;
 134 }
 135
 136 size_t psi_decl_union_get_align(struct psi_decl_union *u)
 137 {
 138         if (!u->align) {
 139                 u->align = psi_decl_type_get_args_align(u->args);
 140         }
 141         return u->align;
 142 }