vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 1 | #include <asn1fix_internal.h> |
| 2 | #include <asn1fix_constraint.h> |
| 3 | #include <asn1fix_crange.h> |
| 4 | |
| 5 | static void _remove_exceptions(arg_t *arg, asn1p_constraint_t *ct); |
| 6 | static int _constraint_value_resolve(arg_t *arg, asn1p_value_t **value); |
| 7 | |
| 8 | int |
| 9 | asn1constraint_pullup(arg_t *arg) { |
| 10 | asn1p_expr_t *expr = arg->expr; |
| 11 | asn1p_constraint_t *ct_parent; |
| 12 | asn1p_constraint_t *ct_expr; |
| 13 | int ret; |
| 14 | |
| 15 | if(expr->combined_constraints) |
| 16 | return 0; /* Operation already performed earlier */ |
| 17 | |
| 18 | switch(expr->meta_type) { |
| 19 | case AMT_TYPE: |
| 20 | case AMT_TYPEREF: |
| 21 | break; |
| 22 | default: |
| 23 | return 0; /* Nothing to do */ |
| 24 | } |
| 25 | |
| 26 | if(expr->expr_type == A1TC_REFERENCE) { |
| 27 | asn1p_ref_t *ref = expr->reference; |
| 28 | asn1p_module_t *mod_rw = arg->mod; |
| 29 | asn1p_expr_t *parent_expr; |
| 30 | |
| 31 | assert(ref); |
| 32 | parent_expr = asn1f_lookup_symbol(arg, ref, &mod_rw); |
| 33 | if(!parent_expr) { |
| 34 | if(errno != EEXIST) { |
| 35 | DEBUG("\tWhile fetching parent constraints: " |
| 36 | "type \"%s\" not found: %s", |
| 37 | asn1f_printable_reference(ref), |
| 38 | strerror(errno)); |
| 39 | return -1; |
| 40 | } else { |
| 41 | /* |
| 42 | * -fknown-extern-type is given. |
| 43 | * Assume there are no constraints there. |
| 44 | */ |
| 45 | WARNING("External type \"%s\": " |
| 46 | "assuming no constraints", |
| 47 | asn1f_printable_reference(ref)); |
| 48 | ct_parent = 0; |
| 49 | } |
| 50 | } else { |
| 51 | arg->expr = parent_expr; |
| 52 | ret = asn1constraint_pullup(arg); |
| 53 | arg->expr = expr; |
| 54 | if(ret) return ret; |
| 55 | |
| 56 | ct_parent = parent_expr->combined_constraints; |
| 57 | } |
| 58 | } else { |
| 59 | ct_parent = 0; |
| 60 | } |
| 61 | |
| 62 | ct_expr = expr->constraints; |
| 63 | |
| 64 | if(!ct_parent && !ct_expr) |
| 65 | return 0; /* No constraints to consider */ |
| 66 | |
| 67 | if(ct_parent) { |
| 68 | ct_parent = asn1p_constraint_clone(ct_parent); |
| 69 | assert(ct_parent); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * If the current type does not have constraints, it inherits |
| 74 | * the constraints of a parent. |
| 75 | */ |
| 76 | if(ct_parent && !ct_expr) { |
| 77 | expr->combined_constraints = ct_parent; |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | ct_expr = asn1p_constraint_clone(ct_expr); |
| 82 | assert(ct_expr); |
| 83 | |
| 84 | /* |
| 85 | * Now we have a set of current expression's constraints, |
| 86 | * and an optional set of the parent expression's constraints. |
| 87 | */ |
| 88 | |
| 89 | if(ct_parent) { |
| 90 | /* |
| 91 | * If we have a parent, remove all the extensions (46.4). |
| 92 | */ |
| 93 | _remove_exceptions(arg, ct_parent); |
| 94 | |
| 95 | expr->combined_constraints = ct_parent; |
| 96 | if(ct_expr->type == ACT_CA_SET) { |
| 97 | int i; |
| 98 | for(i = 0; i < ct_expr->el_count; i++) { |
| 99 | if(asn1p_constraint_insert( |
| 100 | expr->combined_constraints, |
| 101 | ct_expr->elements[i])) { |
| 102 | expr->combined_constraints = 0; |
| 103 | asn1p_constraint_free(ct_expr); |
| 104 | asn1p_constraint_free(ct_parent); |
| 105 | return -1; |
| 106 | } else { |
| 107 | ct_expr->elements[i] = 0; |
| 108 | } |
| 109 | } |
| 110 | asn1p_constraint_free(ct_expr); |
| 111 | } else { |
| 112 | asn1p_constraint_insert(expr->combined_constraints, |
| 113 | ct_expr); |
| 114 | } |
| 115 | } else { |
| 116 | expr->combined_constraints = ct_expr; |
| 117 | } |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | int |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 123 | asn1constraint_resolve(arg_t *arg, asn1p_constraint_t *ct, asn1p_expr_type_e etype, enum asn1p_constraint_type_e effective_type) { |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 124 | int rvalue = 0; |
| 125 | int ret; |
| 126 | int el; |
| 127 | |
| 128 | if(!ct) return 0; |
| 129 | |
| 130 | /* Don't touch information object classes */ |
| 131 | switch(ct->type) { |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 132 | case ACT_CT_SIZE: |
| 133 | case ACT_CT_FROM: |
| 134 | if(effective_type && effective_type != ct->type) { |
| 135 | FATAL("%s at line %d: " |
| 136 | "Incompatible nested %s within %s", |
| 137 | arg->expr->Identifier, ct->_lineno, |
| 138 | asn1p_constraint_type2str(ct->type), |
| 139 | asn1p_constraint_type2str(effective_type) |
| 140 | ); |
| 141 | } |
| 142 | effective_type = ct->type; |
| 143 | break; |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 144 | case ACT_CT_WCOMP: |
| 145 | case ACT_CT_WCOMPS: |
| 146 | case ACT_CA_CRC: |
| 147 | return 0; |
| 148 | default: |
| 149 | break; |
| 150 | } |
| 151 | |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 152 | if(etype != A1TC_INVALID) { |
| 153 | enum asn1p_constraint_type_e check_type; |
| 154 | |
| 155 | check_type = effective_type ? effective_type : ct->type; |
| 156 | |
| 157 | ret = asn1constraint_compatible(etype, check_type); |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 158 | switch(ret) { |
| 159 | case -1: /* If unknown, assume OK. */ |
| 160 | case 1: |
| 161 | break; |
| 162 | case 0: |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 163 | if(effective_type == ACT_CT_SIZE |
| 164 | && (arg->flags & A1F_EXTENDED_SizeConstraint)) |
| 165 | break; |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 166 | default: |
| 167 | FATAL("%s at line %d: " |
| 168 | "Constraint type %s is not applicable to %s", |
| 169 | arg->expr->Identifier, ct->_lineno, |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 170 | asn1p_constraint_type2str(check_type), |
| 171 | ASN_EXPR_TYPE2STR(etype) |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 172 | ); |
| 173 | rvalue = -1; |
| 174 | break; |
| 175 | } |
| 176 | } else { |
| 177 | WARNING("%s at line %d: " |
| 178 | "Constraints ignored: Unresolved parent type", |
| 179 | arg->expr->Identifier, arg->expr->_lineno); |
| 180 | } |
| 181 | |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 182 | /* |
| 183 | * Resolve all possible references, wherever they occur. |
| 184 | */ |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 185 | if(ct->value && ct->value->type == ATV_REFERENCED) { |
| 186 | ret = _constraint_value_resolve(arg, &ct->value); |
| 187 | RET2RVAL(ret, rvalue); |
| 188 | } |
| 189 | if(ct->range_start && ct->range_start->type == ATV_REFERENCED) { |
| 190 | ret = _constraint_value_resolve(arg, &ct->range_start); |
| 191 | RET2RVAL(ret, rvalue); |
| 192 | } |
| 193 | if(ct->range_stop && ct->range_stop->type == ATV_REFERENCED) { |
| 194 | ret = _constraint_value_resolve(arg, &ct->range_stop); |
| 195 | RET2RVAL(ret, rvalue); |
| 196 | } |
| 197 | |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 198 | /* |
| 199 | * Proceed recursively. |
| 200 | */ |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 201 | for(el = 0; el < ct->el_count; el++) { |
vlm | d8d9035 | 2004-08-20 13:25:56 +0000 | [diff] [blame] | 202 | ret = asn1constraint_resolve(arg, ct->elements[el], |
| 203 | etype, effective_type); |
vlm | b5be8c3 | 2004-08-18 05:42:05 +0000 | [diff] [blame] | 204 | RET2RVAL(ret, rvalue); |
| 205 | } |
| 206 | |
| 207 | return rvalue; |
| 208 | } |
| 209 | |
| 210 | static void |
| 211 | _remove_exceptions(arg_t *arg, asn1p_constraint_t *ct) { |
| 212 | int i; |
| 213 | |
| 214 | for(i = 0; i < ct->el_count; i++) { |
| 215 | if(ct->elements[i]->type == ACT_EL_EXT) |
| 216 | break; |
| 217 | _remove_exceptions(arg, ct->elements[i]); |
| 218 | } |
| 219 | |
| 220 | /* Remove the elements at and after the extensibility mark */ |
| 221 | for(; i < ct->el_count; ct->el_count--) { |
| 222 | asn1p_constraint_t *rm; |
| 223 | rm = ct->elements[ct->el_count-1]; |
| 224 | asn1p_constraint_free(rm); |
| 225 | } |
| 226 | |
| 227 | if(i < ct->el_size) |
| 228 | ct->elements[i] = 0; |
| 229 | } |
| 230 | |
| 231 | |
| 232 | static int |
| 233 | _constraint_value_resolve(arg_t *arg, asn1p_value_t **value) { |
| 234 | asn1p_expr_t static_expr; |
| 235 | asn1p_expr_t *tmp_expr; |
| 236 | asn1p_module_t *mod_rw = arg->mod; |
| 237 | arg_t tmp_arg; |
| 238 | int rvalue = 0; |
| 239 | int ret; |
| 240 | |
| 241 | tmp_expr = asn1f_lookup_symbol(arg, (*value)->value.reference, &mod_rw); |
| 242 | if(tmp_expr == NULL) { |
| 243 | FATAL("Cannot find symbol %s " |
| 244 | "used in %s subtype constraint at line %d", |
| 245 | asn1f_printable_reference((*value)->value.reference), |
| 246 | arg->expr->Identifier, arg->expr->_lineno); |
| 247 | assert((*value)->type == ATV_REFERENCED); |
| 248 | return -1; |
| 249 | } |
| 250 | |
| 251 | static_expr = *tmp_expr; |
| 252 | static_expr.value = *value; |
| 253 | tmp_arg = *arg; |
| 254 | tmp_arg.mod = mod_rw; |
| 255 | tmp_arg.expr = &static_expr; |
| 256 | ret = asn1f_fix_dereference_values(&tmp_arg); |
| 257 | RET2RVAL(ret, rvalue); |
| 258 | assert(static_expr.value); |
| 259 | *value = static_expr.value; |
| 260 | |
| 261 | return rvalue; |
| 262 | } |