mirror of https://gerrit.osmocom.org/asn1c
263 lines
6.1 KiB
C
263 lines
6.1 KiB
C
#include "asn1fix_internal.h"
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#include "asn1fix_constraint.h"
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#include "asn1fix_crange.h"
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static void _remove_exceptions(arg_t *arg, asn1p_constraint_t *ct);
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static int _constraint_value_resolve(arg_t *arg, asn1p_module_t *mod, asn1p_value_t **value);
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int
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asn1constraint_pullup(arg_t *arg) {
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asn1p_expr_t *expr = arg->expr;
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asn1p_constraint_t *ct_parent;
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asn1p_constraint_t *ct_expr;
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int ret;
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if(expr->combined_constraints)
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return 0; /* Operation already performed earlier */
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switch(expr->meta_type) {
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case AMT_TYPE:
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case AMT_TYPEREF:
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break;
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default:
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return 0; /* Nothing to do */
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}
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if(expr->expr_type == A1TC_REFERENCE) {
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asn1p_ref_t *ref = expr->reference;
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asn1p_expr_t *parent_expr;
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assert(ref);
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parent_expr = asn1f_lookup_symbol(arg, expr->module, ref);
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if(!parent_expr) {
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if(errno != EEXIST) {
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DEBUG("\tWhile fetching parent constraints: "
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"type \"%s\" not found: %s",
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asn1f_printable_reference(ref),
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strerror(errno));
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return -1;
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} else {
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/*
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* -fknown-extern-type is given.
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* Assume there are no constraints there.
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*/
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WARNING("External type \"%s\": "
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"assuming no constraints",
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asn1f_printable_reference(ref));
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ct_parent = 0;
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}
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} else {
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arg->expr = parent_expr;
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ret = asn1constraint_pullup(arg);
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arg->expr = expr;
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if(ret) return ret;
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ct_parent = parent_expr->combined_constraints;
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}
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} else {
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ct_parent = 0;
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}
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ct_expr = expr->constraints;
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if(!ct_parent && !ct_expr)
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return 0; /* No constraints to consider */
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if(ct_parent) {
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ct_parent = asn1p_constraint_clone(ct_parent);
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assert(ct_parent);
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}
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/*
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* If the current type does not have constraints, it inherits
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* the constraints of a parent.
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*/
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if(ct_parent && !ct_expr) {
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expr->combined_constraints = ct_parent;
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return 0;
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}
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ct_expr = asn1p_constraint_clone(ct_expr);
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assert(ct_expr);
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/*
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* Now we have a set of current expression's constraints,
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* and an optional set of the parent expression's constraints.
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*/
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if(ct_parent) {
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/*
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* If we have a parent, remove all the extensions (46.4).
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*/
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_remove_exceptions(arg, ct_parent);
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expr->combined_constraints = ct_parent;
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if(ct_expr->type == ACT_CA_SET) {
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unsigned int i;
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for(i = 0; i < ct_expr->el_count; i++) {
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if(asn1p_constraint_insert(
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expr->combined_constraints,
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ct_expr->elements[i])) {
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expr->combined_constraints = 0;
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asn1p_constraint_free(ct_expr);
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asn1p_constraint_free(ct_parent);
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return -1;
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} else {
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ct_expr->elements[i] = 0;
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}
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}
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asn1p_constraint_free(ct_expr);
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} else {
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asn1p_constraint_insert(expr->combined_constraints,
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ct_expr);
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}
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} else {
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expr->combined_constraints = ct_expr;
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}
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return 0;
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}
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int
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asn1constraint_resolve(arg_t *arg, asn1p_module_t *mod, asn1p_constraint_t *ct, asn1p_expr_type_e etype, enum asn1p_constraint_type_e effective_type) {
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unsigned int el;
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int rvalue = 0;
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int ret;
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if(!ct) return 0;
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/* Don't touch information object classes */
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switch(ct->type) {
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case ACT_CT_SIZE:
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case ACT_CT_FROM:
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if(effective_type && effective_type != ct->type) {
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FATAL("%s at line %d: "
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"Incompatible nested %s within %s",
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arg->expr->Identifier, ct->_lineno,
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asn1p_constraint_type2str(ct->type),
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asn1p_constraint_type2str(effective_type)
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);
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}
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effective_type = ct->type;
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break;
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case ACT_CT_WCOMP:
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case ACT_CT_WCOMPS:
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case ACT_CA_CRC:
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return 0;
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default:
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break;
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}
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if(etype != A1TC_INVALID) {
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enum asn1p_constraint_type_e check_type;
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check_type = effective_type ? effective_type : ct->type;
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ret = asn1constraint_compatible(etype, check_type);
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switch(ret) {
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case -1: /* If unknown, assume OK. */
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case 1:
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break;
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case 0:
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if(effective_type == ACT_CT_SIZE
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&& (arg->flags & A1F_EXTENDED_SizeConstraint))
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break;
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default:
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FATAL("%s at line %d: "
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"Constraint type %s is not applicable to %s",
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arg->expr->Identifier, ct->_lineno,
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asn1p_constraint_type2str(check_type),
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ASN_EXPR_TYPE2STR(etype)
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);
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rvalue = -1;
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break;
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}
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} else {
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WARNING("%s at line %d: "
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"Constraints ignored: Unresolved parent type",
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arg->expr->Identifier, arg->expr->_lineno);
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}
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/*
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* Resolve all possible references, wherever they occur.
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*/
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if(ct->value && ct->value->type == ATV_REFERENCED) {
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ret = _constraint_value_resolve(arg, mod, &ct->value);
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RET2RVAL(ret, rvalue);
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}
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if(ct->range_start && ct->range_start->type == ATV_REFERENCED) {
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ret = _constraint_value_resolve(arg, mod, &ct->range_start);
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RET2RVAL(ret, rvalue);
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}
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if(ct->range_stop && ct->range_stop->type == ATV_REFERENCED) {
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ret = _constraint_value_resolve(arg, mod, &ct->range_stop);
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RET2RVAL(ret, rvalue);
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}
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/*
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* Proceed recursively.
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*/
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for(el = 0; el < ct->el_count; el++) {
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ret = asn1constraint_resolve(arg, mod, ct->elements[el],
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etype, effective_type);
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RET2RVAL(ret, rvalue);
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}
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return rvalue;
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}
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static void
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_remove_exceptions(arg_t *arg, asn1p_constraint_t *ct) {
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unsigned int i;
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for(i = 0; i < ct->el_count; i++) {
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if(ct->elements[i]->type == ACT_EL_EXT)
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break;
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_remove_exceptions(arg, ct->elements[i]);
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}
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/* Remove the elements at and after the extensibility mark */
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for(; i < ct->el_count; ct->el_count--) {
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asn1p_constraint_t *rm;
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rm = ct->elements[ct->el_count-1];
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asn1p_constraint_free(rm);
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}
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if(i < ct->el_size)
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ct->elements[i] = 0;
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}
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static int
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_constraint_value_resolve(arg_t *arg, asn1p_module_t *mod, asn1p_value_t **value) {
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asn1p_expr_t static_expr;
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asn1p_expr_t *tmp_expr;
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arg_t tmp_arg;
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int rvalue = 0;
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int ret;
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tmp_expr = asn1f_lookup_symbol(arg, mod, (*value)->value.reference);
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if(tmp_expr == NULL) {
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FATAL("Cannot find symbol %s (%s) "
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"used in %s subtype constraint at line %d",
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asn1f_printable_reference((*value)->value.reference),
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mod->Identifier,
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arg->expr->Identifier,
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arg->expr->_lineno);
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assert((*value)->type == ATV_REFERENCED);
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return -1;
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}
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static_expr = *tmp_expr;
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static_expr.value = *value;
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tmp_arg = *arg;
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tmp_arg.mod = tmp_expr->module;
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tmp_arg.expr = &static_expr;
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ret = asn1f_fix_dereference_values(&tmp_arg);
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RET2RVAL(ret, rvalue);
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assert(static_expr.value);
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*value = static_expr.value;
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return rvalue;
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}
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