| #include "asn1fix_internal.h" |
| |
| enum ftt_what { |
| FTT_TYPE, /* Find the type of the given expression */ |
| FTT_VALUE, /* Find the value of the given expression */ |
| }; |
| |
| static asn1p_expr_t *asn1f_find_terminal_thing(arg_t *arg, asn1p_expr_t *expr, enum ftt_what); |
| static int asn1f_compatible_with_exports(arg_t *arg, asn1p_module_t *mod, const char *name); |
| |
| |
| /* |
| * Lookup a child by its name. |
| */ |
| asn1p_expr_t * |
| asn1f_lookup_child(asn1p_expr_t *tc, const char *name) { |
| asn1p_expr_t *child_tc; |
| |
| TQ_FOR(child_tc, &(tc->members), next) { |
| if(child_tc->Identifier |
| && strcmp(child_tc->Identifier, name) == 0) { |
| return child_tc; |
| } |
| } |
| |
| errno = ESRCH; |
| return NULL; |
| } |
| |
| asn1p_module_t * |
| asn1f_lookup_in_imports(arg_t *arg, asn1p_module_t *mod, const char *name) { |
| asn1p_xports_t *xp; |
| asn1p_expr_t *tc; |
| |
| /* |
| * Search in which exactly module this name is defined. |
| */ |
| TQ_FOR(xp, &(mod->imports), xp_next) { |
| TQ_FOR(tc, &(xp->members), next) { |
| if(strcmp(name, tc->Identifier) == 0) |
| break; |
| } |
| if(tc) break; |
| } |
| if(xp == NULL) { |
| errno = ESRCH; |
| return NULL; |
| } |
| |
| /* |
| * Okay, right now we have a module name and, hopefully, an OID. |
| * Search the arg->asn for the specified module. |
| */ |
| mod = asn1f_lookup_module(arg, xp->from, xp->from_oid); |
| if(mod == NULL) { |
| /* Conditional debug */ |
| if(!(arg->expr->_mark & TM_BROKEN)) { |
| arg->expr->_mark |= TM_BROKEN; |
| FATAL("Cannot find external module \"%s\" " |
| "mentioned for " |
| "\"%s\" at line %d", |
| xp->from, name, arg->expr->_lineno); |
| } |
| /* ENOENT/ETOOMANYREFS */ |
| return NULL; |
| } |
| |
| /* |
| * Check that the EXPORTS section of this module contains |
| * the symbol we care about, or it is EXPORTS ALL. |
| */ |
| if(asn1f_compatible_with_exports(arg, mod, name)) { |
| errno = EPERM; |
| return NULL; |
| } |
| |
| return mod; |
| } |
| |
| asn1p_module_t * |
| asn1f_lookup_module(arg_t *arg, const char *module_name, asn1p_oid_t *oid) { |
| asn1p_module_t *mod; |
| |
| assert(module_name); |
| |
| /* |
| * If OID is given, the module_name is unused. |
| * If OID is not given, the module_name may mean |
| * either the real module's name, or the symbol which is the |
| * result of renaming. Check this first. |
| */ |
| if(oid == 0) { |
| asn1p_xports_t *xp; |
| /* |
| * Check inside the IMPORTS section for possible renaming. |
| * Renaming practically means that a module_name is mentioned |
| * somewhere in the IMPORTS section AND OID is given. |
| */ |
| TQ_FOR(xp, &(arg->mod->imports), xp_next) { |
| if(strcmp(module_name, xp->from)) |
| continue; |
| if(oid) { |
| FATAL("Ambiguous reference: " |
| "%s " |
| "matches several modules", |
| module_name); |
| errno = ETOOMANYREFS; |
| return NULL; |
| } |
| /* |
| * Yes, there is a renaming. |
| * Make lookup use OID instead. |
| */ |
| oid = xp->from_oid; |
| } |
| } |
| |
| /* |
| * Perform lookup using OID or module_name. |
| */ |
| TQ_FOR(mod, &(arg->asn->modules), mod_next) { |
| if(oid) { |
| if(mod->module_oid) { |
| if(asn1p_oid_compare(oid, |
| mod->module_oid)) { |
| continue; |
| } else { |
| /* Match! Even if name doesn't. */ |
| return mod; |
| } |
| } else { |
| /* Not match, even if name is the same. */ |
| continue; |
| } |
| } |
| |
| if(strcmp(module_name, mod->Identifier) == 0) |
| return mod; |
| } |
| |
| DEBUG("\tModule \"%s\" not found", module_name); |
| |
| errno = ENOENT; |
| return NULL; |
| } |
| |
| |
| |
| asn1p_expr_t * |
| asn1f_lookup_symbol(arg_t *arg, asn1p_module_t *mod, asn1p_ref_t *ref) { |
| asn1p_expr_t *ref_tc; /* Referenced tc */ |
| asn1p_module_t *imports_from; |
| char *modulename; |
| char *identifier; |
| |
| /* |
| * First of all, a reference to a symbol may be specified |
| * using several possible forms: |
| * a) simple identifier |
| * v INTEGER ::= value |
| * b) external reference |
| * v INTEGER ::= Module1.value |
| * c) class-related stuff (the most complex stuff) |
| * v ::= <[A-Z][A-Z0-9a-z-]*>.&<[A-Z0-9a-z-]+>. |
| * All other forms are not implemented at this moment. |
| */ |
| |
| DEBUG("(%s) in %s for line %d", |
| asn1f_printable_reference(ref), |
| mod->Identifier, |
| ref->_lineno); |
| |
| if(ref->comp_count == 1) { |
| modulename = NULL; |
| identifier = ref->components[0].name; |
| } else if(ref->comp_count == 2 |
| && ref->components[1].name[0] != '&') { |
| modulename = ref->components[0].name; |
| identifier = ref->components[1].name; |
| } else if(ref->comp_count > 1 |
| && isupper(ref->components[0].name[0]) |
| && ref->components[1].name[0] == '&') { |
| asn1p_expr_t *extract; |
| /* |
| * This is a reference to a CLASS-related stuff. |
| * Employ a separate function for that. |
| */ |
| extract = asn1f_class_access(arg, mod, ref); |
| |
| return extract; |
| } else { |
| DEBUG("\tToo many components: %d", ref->comp_count); |
| errno = EINVAL; |
| return NULL; |
| } |
| |
| /* |
| * If module name is specified explicitly |
| * OR the current module's IMPORTS clause contains the identifier, |
| * fetch that module. |
| */ |
| if(modulename) { |
| imports_from = asn1f_lookup_module(arg, modulename, 0); |
| if(imports_from == NULL) { |
| FATAL("Module \"%s\" " |
| "mentioned at line %d is not found", |
| modulename, ref->_lineno); |
| return NULL; |
| } |
| |
| /* |
| * Check that the EXPORTS section of this module contains |
| * the symbol we care about, or it is EXPORTS ALL. |
| */ |
| if(asn1f_compatible_with_exports(arg,imports_from,identifier)) { |
| errno = EPERM; |
| return NULL; |
| } |
| } else { |
| imports_from = asn1f_lookup_in_imports(arg, mod, identifier); |
| if(imports_from == NULL && errno != ESRCH) { |
| /* |
| * Return only of the name was not found. |
| * If module was not found or more serious error |
| * encountered, just return preserving the errno. |
| */ |
| return NULL; |
| } |
| } |
| |
| /* |
| * The symbol is being imported from another module. |
| */ |
| if(imports_from) { |
| asn1p_ref_t tmpref = *ref; |
| asn1p_expr_t *expr; |
| if(modulename) { |
| /* |
| * The modulename is specified inside this reference. |
| * To avoid recursion, reformat the reference |
| * as it were local to that module. |
| */ |
| tmpref.components++; /* Hide the first element */ |
| tmpref.comp_count--; |
| assert(tmpref.comp_count > 0); |
| } |
| |
| expr = asn1f_lookup_symbol(arg, imports_from, &tmpref); |
| if(!expr && !(arg->expr->_mark & TM_BROKEN)) { |
| arg->expr->_mark |= TM_BROKEN; |
| if(modulename) { |
| FATAL("Module %s referred by %s in module %s " |
| "does not contain the requested symbol", |
| imports_from->Identifier, |
| asn1f_printable_reference(ref), |
| mod->Identifier); |
| } else { |
| FATAL("Module %s referred in IMPORTS section " |
| "for %s of module %s does not contain " |
| "the requested symbol", |
| imports_from->Identifier, |
| asn1f_printable_reference(ref), |
| mod->Identifier); |
| } |
| } |
| return expr; |
| } |
| |
| /* |
| * Now we know where to search for a value: in the current module. |
| */ |
| TQ_FOR(ref_tc, &(mod->members), next) { |
| if(ref_tc->Identifier) |
| if(strcmp(ref_tc->Identifier, identifier) == 0) |
| break; |
| } |
| if(ref_tc == NULL) { |
| DEBUG("Module \"%s\" does not contain \"%s\" " |
| "mentioned at line %d: %s", |
| mod->Identifier, |
| identifier, |
| ref->_lineno, |
| strerror(errno) |
| ); |
| if(asn1f_check_known_external_type(identifier) == 0) { |
| errno = EEXIST; /* Exists somewhere */ |
| } else { |
| errno = ESRCH; |
| } |
| return NULL; |
| } |
| |
| return ref_tc; |
| } |
| |
| |
| asn1p_expr_t * |
| asn1f_find_terminal_type(arg_t *arg, asn1p_expr_t *expr) { |
| return asn1f_find_terminal_thing(arg, expr, FTT_TYPE); |
| } |
| |
| asn1p_expr_t * |
| asn1f_find_terminal_value(arg_t *arg, asn1p_expr_t *expr) { |
| return asn1f_find_terminal_thing(arg, expr, FTT_VALUE); |
| } |
| |
| static asn1p_expr_t * |
| asn1f_find_terminal_thing(arg_t *arg, asn1p_expr_t *expr, enum ftt_what what) { |
| asn1p_ref_t *ref = 0; |
| asn1p_expr_t *tc; |
| |
| switch(what) { |
| case FTT_TYPE: |
| /* Expression may be a terminal type itself */ |
| if(expr->expr_type != A1TC_REFERENCE) |
| return expr; |
| ref = expr->reference; |
| break; |
| case FTT_VALUE: |
| assert(expr->meta_type == AMT_VALUE); |
| assert(expr->value); |
| /* Expression may be a terminal type itself */ |
| if(expr->value->type != ATV_REFERENCED) |
| return expr; |
| ref = expr->value->value.reference; |
| break; |
| } |
| |
| DEBUG("%s(%s->%s) for line %d", |
| (what == FTT_VALUE)?"VALUE":"TYPE", |
| expr->Identifier, asn1f_printable_reference(ref), |
| expr->_lineno); |
| |
| assert(ref); |
| |
| /* |
| * Lookup inside the type itself (ENUMERATED, INTEGER, etc). |
| */ |
| if(what == FTT_VALUE) { |
| asn1p_expr_t *val_type_tc; |
| val_type_tc = asn1f_find_terminal_type(arg, expr); |
| if(val_type_tc |
| && asn1f_look_value_in_type(arg, val_type_tc, expr)) |
| return NULL; |
| if(expr->value->type != ATV_REFERENCED) { |
| return expr; |
| } |
| assert(ref == expr->value->value.reference); |
| ref = expr->value->value.reference; |
| } |
| |
| /* |
| * Lookup inside the default module and its IMPORTS section. |
| */ |
| tc = asn1f_lookup_symbol(arg, expr->module, ref); |
| if(tc == NULL) { |
| DEBUG("\tSymbol \"%s\" not found: %s", |
| asn1f_printable_reference(ref), |
| strerror(errno)); |
| return NULL; |
| } |
| |
| /* |
| * Recursive loops detection. |
| */ |
| if(tc->_mark & TM_RECURSION) { |
| DEBUG("Recursion loop detected for %s at line %d", |
| asn1f_printable_reference(ref), ref->_lineno); |
| errno = EPERM; |
| return NULL; |
| } |
| |
| tc->_mark |= TM_RECURSION; |
| WITH_MODULE(tc->module, |
| expr = asn1f_find_terminal_thing(arg, tc, what)); |
| tc->_mark &= ~TM_RECURSION; |
| |
| return expr; |
| } |
| |
| /* |
| * Make sure that the specified name is present or otherwise does |
| * not contradict with the EXPORTS clause of the specified module. |
| */ |
| static int |
| asn1f_compatible_with_exports(arg_t *arg, asn1p_module_t *mod, const char *name) { |
| asn1p_xports_t *exports; |
| asn1p_expr_t *item; |
| |
| assert(mod); |
| assert(name); |
| |
| exports = TQ_FIRST(&(mod->exports)); |
| if(exports == NULL) { |
| /* No EXPORTS section or EXPORTS ALL; */ |
| return 0; |
| } |
| |
| TQ_FOR(item, &(exports->members), next) { |
| if(strcmp(item->Identifier, name) == 0) |
| return 0; |
| } |
| |
| /* Conditional debug */ |
| if(!(arg->expr->_mark & TM_BROKEN)) { |
| arg->expr->_mark |= TM_BROKEN; |
| FATAL("EXPORTS section of module %s in %s " |
| "does not mention %s at line %d", |
| mod->Identifier, mod->source_file_name, name, |
| arg->expr->_lineno); |
| } |
| |
| errno = ESRCH; |
| return -1; |
| } |