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
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <assert.h>
  36
  37 #include "data.h"
  38
  39 decl_union* init_decl_union(const char* name, decl_args* args) {
  40         decl_union* u = calloc(1, sizeof(*u));
  41         u->name = strdup(name);
  42         u->args = args;
  43         return u;
  44 }
  45
  46 void free_decl_union(decl_union* u) {
  47         if (u->token) {
  48                 free(u->token);
  49         }
  50         if (u->args) {
  51                 free_decl_args(u->args);
  52         }
  53         free(u->name);
  54         free(u);
  55 }
  56
  57 void dump_decl_union(int fd, decl_union *unn) {
  58         dprintf(fd, "union %s::(%zu, %zu)", unn->name, unn->align, unn->size);
  59         if (unn->args && unn->args->count) {
  60                 dump_decl_args_with_layout(fd, unn->args, 0);
  61         } else {
  62                 dprintf(fd, ";");
  63         }
  64 }
  65
  66 decl_arg *locate_decl_union_member(decl_union *u, decl_var *var) {
  67         if (u->args) {
  68                 return locate_decl_var_arg(var, u->args, NULL);
  69         }
  70
  71         return NULL;
  72 }
  73
  74 int validate_decl_union(struct psi_data *data, decl_union *u) {
  75         size_t i, pos, len, size = 0, align;
  76
  77         if (!u->size && !u->args->count) {
  78                 data->error(data, u->token, PSI_WARNING,
  79                                 "Cannot compute size of empty union %s",
  80                                 u->name);
  81                 return 0;
  82         }
  83
  84         for (i = 0; i < u->args->count; ++i) {
  85                 decl_arg *darg = u->args->args[i];
  86
  87                 if (!validate_decl_arg(data, darg)) {
  88                         return 0;
  89                 }
  90
  91                 assert(!darg->var->arg || darg->var->arg == darg);
  92
  93                 darg->var->arg = darg;
  94
  95                 if (!validate_decl_arg_args(data, darg, u)) {
  96                         return 0;
  97                 } else if (darg->layout) {
  98                         pos = darg->layout->pos;
  99
 100                         align = align_decl_arg(darg, &pos, &len);
 101
 102                         if (darg->layout->pos != 0) {
 103                                 data->error(data, darg->token, PSI_WARNING,
 104                                                 "Offset of %s.%s should be 0",
 105                                                 u->name, darg->var->name);
 106                                 darg->layout->pos = 0;
 107                         }
 108                         if (darg->layout->len != len) {
 109                                 data->error(data, darg->token, PSI_WARNING,
 110                                                 "Computed size %zu of %s.%s does not match"
 111                                                 " pre-defined size %zu of type '%s'",
 112                                                 len, u->name, darg->var->name, darg->layout->len,
 113                                                 darg->type->name);
 114                         }
 115                 } else {
 116                         pos = 0;
 117
 118                         align = align_decl_arg(darg, &pos, &len);
 119                         darg->layout = init_decl_struct_layout(pos, len);
 120
 121                 }
 122                 if (len > size) {
 123                         size = len;
 124                 }
 125                 if (align > u->align) {
 126                         u->align = align;
 127                 }
 128         }
 129
 130         sort_decl_args(u->args);
 131
 132         if (u->size < size) {
 133                 u->size = psi_align(size, u->align);
 134         }
 135
 136         return 1;
 137 }
 138
 139 size_t alignof_decl_union(decl_union *u) {
 140         if (!u->align) {
 141                 u->align = alignof_decl_args(u->args);
 142         }
 143         return u->align;
 144 }