smatch_hooks.c

   1 /*
   2  * sparse/smatch_hooks.c
   3  *
   4  * Copyright (C) 2006 Dan Carpenter.
   5  *
   6  *  Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include "smatch.h"
  11
  12 enum data_type {
  13         EXPR_PTR,
  14         STMT_PTR,
  15         SYMBOL_PTR,
  16 };
  17
  18 struct hook_container {
  19         int hook_type;
  20         enum data_type data_type;
  21         void *fn;
  22 };
  23 ALLOCATOR(hook_container, "hook functions");
  24 DECLARE_PTR_LIST(hook_func_list, struct hook_container);
  25 static struct hook_func_list *hook_funcs;
  26 static struct hook_func_list *merge_funcs;
  27 static struct hook_func_list *unmatched_state_funcs;
  28
  29 struct scope_container {
  30         void *fn;
  31         void *data;
  32 };
  33 ALLOCATOR(scope_container, "scope hook functions");
  34 DECLARE_PTR_LIST(scope_hook_list, struct scope_container);
  35 DECLARE_PTR_LIST(scope_hook_stack, struct scope_hook_list);
  36 static struct scope_hook_stack *scope_hooks;
  37
  38 void add_hook(void *func, enum hook_type type)
  39 {
  40         struct hook_container *container = __alloc_hook_container(0);
  41         container->hook_type = type;
  42         container->fn = func;
  43         switch (type) {
  44         case EXPR_HOOK:
  45                 container->data_type = EXPR_PTR;
  46                 break;
  47         case STMT_HOOK:
  48                 container->data_type = STMT_PTR;
  49                 break;
  50         case SYM_HOOK:
  51                 container->data_type = EXPR_PTR;
  52                 break;
  53         case STRING_HOOK:
  54                 container->data_type = EXPR_PTR;
  55                 break;
  56         case DECLARATION_HOOK:
  57                 container->data_type = SYMBOL_PTR;
  58                 break;
  59         case ASSIGNMENT_HOOK:
  60                 container->data_type = EXPR_PTR;
  61                 break;
  62         case RAW_ASSIGNMENT_HOOK:
  63                 container->data_type = EXPR_PTR;
  64                 break;
  65         case CALL_ASSIGNMENT_HOOK:
  66                 container->data_type = EXPR_PTR;
  67                 break;
  68         case MACRO_ASSIGNMENT_HOOK:
  69                 container->data_type = EXPR_PTR;
  70                 break;
  71         case BINOP_HOOK:
  72                 container->data_type = EXPR_PTR;
  73                 break;
  74         case OP_HOOK:
  75                 container->data_type = EXPR_PTR;
  76                 break;
  77         case LOGIC_HOOK:
  78                 container->data_type = EXPR_PTR;
  79                 break;
  80         case PRELOOP_HOOK:
  81                 container->data_type = STMT_PTR;
  82                 break;
  83         case CONDITION_HOOK:
  84                 container->data_type = EXPR_PTR;
  85                 break;
  86         case SELECT_HOOK:
  87                 container->data_type = EXPR_PTR;
  88                 break;
  89         case WHOLE_CONDITION_HOOK:
  90                 container->data_type = EXPR_PTR;
  91                 break;
  92         case FUNCTION_CALL_HOOK:
  93                 container->data_type = EXPR_PTR;
  94                 break;
  95         case DEREF_HOOK:
  96                 container->data_type = EXPR_PTR;
  97                 break;
  98         case CASE_HOOK:
  99                 /* nothing needed */
 100                 break;
 101         case ASM_HOOK:
 102                 container->data_type = STMT_PTR;
 103                 break;
 104         case BASE_HOOK:
 105                 container->data_type = SYMBOL_PTR;
 106                 break;
 107         case FUNC_DEF_HOOK:
 108                 container->data_type = SYMBOL_PTR;
 109                 break;
 110         case END_FUNC_HOOK:
 111                 container->data_type = SYMBOL_PTR;
 112                 break;
 113         case RETURN_HOOK:
 114                 container->data_type = EXPR_PTR;
 115                 break;
 116         case END_FILE_HOOK:
 117                 /* nothing needed... */
 118                 break;
 119         }
 120         add_ptr_list(&hook_funcs, container);
 121 }
 122
 123 void add_merge_hook(int client_id, merge_func_t *func)
 124 {
 125         struct hook_container *container = __alloc_hook_container(0);
 126         container->data_type = client_id;
 127         container->fn = func;
 128         add_ptr_list(&merge_funcs, container);
 129 }
 130
 131 void add_unmatched_state_hook(int client_id, unmatched_func_t *func)
 132 {
 133         struct hook_container *container = __alloc_hook_container(0);
 134         container->data_type = client_id;
 135         container->fn = func;
 136         add_ptr_list(&unmatched_state_funcs, container);
 137 }
 138
 139 static void pass_to_client(void * fn)
 140 {
 141         typedef void (expr_func)();
 142         ((expr_func *) fn)();
 143 }
 144
 145 static void pass_expr_to_client(void * fn, void * data)
 146 {
 147         typedef void (expr_func)(struct expression *expr);
 148         ((expr_func *) fn)((struct expression *) data);
 149 }
 150
 151 static void pass_stmt_to_client(void * fn, void * data)
 152 {
 153         typedef void (stmt_func)(struct statement *stmt);
 154         ((stmt_func *) fn)((struct statement *) data);
 155 }
 156
 157 static void pass_sym_to_client(void * fn, void * data)
 158 {
 159         typedef void (sym_func)(struct symbol *sym);
 160         ((sym_func *) fn)((struct symbol *) data);
 161 }
 162
 163 void __pass_to_client(void *data, enum hook_type type)
 164 {
 165         struct hook_container *container;
 166
 167         FOR_EACH_PTR(hook_funcs, container) {
 168                 if (container->hook_type == type) {
 169                         switch (container->data_type) {
 170                         case EXPR_PTR:
 171                                 pass_expr_to_client(container->fn, data);
 172                                 break;
 173                         case STMT_PTR:
 174                                 pass_stmt_to_client(container->fn, data);
 175                                 break;
 176                         case SYMBOL_PTR:
 177                                 pass_sym_to_client(container->fn, data);
 178                                 break;
 179                         }
 180                 }
 181         } END_FOR_EACH_PTR(container);
 182 }
 183
 184 void __pass_to_client_no_data(enum hook_type type)
 185 {
 186         struct hook_container *container;
 187
 188         FOR_EACH_PTR(hook_funcs, container) {
 189                 if (container->hook_type == type)
 190                         pass_to_client(container->fn);
 191         } END_FOR_EACH_PTR(container);
 192 }
 193
 194 void __pass_case_to_client(struct expression *switch_expr,
 195                            struct expression *case_expr)
 196 {
 197         typedef void (case_func)(struct expression *switch_expr,
 198                                  struct expression *case_expr);
 199         struct hook_container *container;
 200
 201         FOR_EACH_PTR(hook_funcs, container) {
 202                 if (container->hook_type == CASE_HOOK) {
 203                         ((case_func *) container->fn)(switch_expr, case_expr);
 204                 }
 205         } END_FOR_EACH_PTR(container);
 206 }
 207
 208 int __has_merge_function(int client_id)
 209 {
 210         struct hook_container *tmp;
 211
 212         FOR_EACH_PTR(merge_funcs, tmp) {
 213                 if (tmp->data_type == client_id)
 214                         return 1;
 215         } END_FOR_EACH_PTR(tmp);
 216         return 0;
 217 }
 218
 219 struct smatch_state *__client_merge_function(int owner, const char *name,
 220                                              struct symbol *sym,
 221                                              struct smatch_state *s1,
 222                                              struct smatch_state *s2)
 223 {
 224         struct smatch_state *tmp_state;
 225         struct hook_container *tmp;
 226
 227         /* Pass NULL states first and the rest alphabetically by name */
 228         if (!s2 || (s1 && strcmp(s2->name, s1->name) < 0)) {
 229                 tmp_state = s1;
 230                 s1 = s2;
 231                 s2 = tmp_state;
 232         }
 233
 234         FOR_EACH_PTR(merge_funcs, tmp) {
 235                 if (tmp->data_type == owner)
 236                         return ((merge_func_t *) tmp->fn)(name, sym, s1, s2);
 237         } END_FOR_EACH_PTR(tmp);
 238         return &undefined;
 239 }
 240
 241 struct smatch_state *__client_unmatched_state_function(struct sm_state *sm)
 242 {
 243         struct hook_container *tmp;
 244
 245         FOR_EACH_PTR(unmatched_state_funcs, tmp) {
 246                 if (tmp->data_type == sm->owner)
 247                         return ((unmatched_func_t *) tmp->fn)(sm);
 248         } END_FOR_EACH_PTR(tmp);
 249         return &undefined;
 250 }
 251
 252 static struct scope_hook_list *pop_scope_hook_list(struct scope_hook_stack **stack)
 253 {
 254         struct scope_hook_list *hook_list;
 255
 256         hook_list = last_ptr_list((struct ptr_list *)*stack);
 257         delete_ptr_list_last((struct ptr_list **)stack);
 258         return hook_list;
 259 }
 260
 261 static void push_scope_hook_list(struct scope_hook_stack **stack, struct scope_hook_list *l)
 262 {
 263         add_ptr_list(stack, l);
 264 }
 265
 266 void add_scope_hook(scope_hook *fn, void *data)
 267 {
 268         struct scope_hook_list *hook_list;
 269         struct scope_container *new;
 270
 271         if (!scope_hooks)
 272                 return;
 273         hook_list = pop_scope_hook_list(&scope_hooks);
 274         new = __alloc_scope_container(0);
 275         new->fn = fn;
 276         new->data = data;
 277         add_ptr_list(&hook_list, new);
 278         push_scope_hook_list(&scope_hooks, hook_list);
 279 }
 280
 281 void __push_scope_hooks(void)
 282 {
 283         push_scope_hook_list(&scope_hooks, NULL);
 284 }
 285
 286 void __call_scope_hooks(void)
 287 {
 288         struct scope_hook_list *hook_list;
 289         struct scope_container *tmp;
 290
 291         if (!scope_hooks)
 292                 return;
 293
 294         hook_list = pop_scope_hook_list(&scope_hooks);
 295         FOR_EACH_PTR(hook_list, tmp) {
 296                 ((scope_hook *) tmp->fn)(tmp->data);
 297                 __free_scope_container(tmp);
 298         } END_FOR_EACH_PTR(tmp);
 299 }