Handle negative time and offset from Epoch
[babeltrace.git] / formats / ctf / metadata / ctf-visitor-generate-io-struct.c
index a18f762c9b189b53aee0e58035e192499ea29957..53d67d24c77ede0c217db3f4282b6a75764e4962 100644 (file)
@@ -36,7 +36,7 @@
 #include <babeltrace/list.h>
 #include <babeltrace/types.h>
 #include <babeltrace/ctf/metadata.h>
-#include <babeltrace/uuid.h>
+#include <babeltrace/compat/uuid.h>
 #include <babeltrace/endian.h>
 #include <babeltrace/ctf/events-internal.h>
 #include "ctf-scanner.h"
@@ -95,10 +95,11 @@ char *concatenate_unary_strings(struct bt_list_head *head)
        bt_list_for_each_entry(node, head, siblings) {
                char *src_string;
 
-               assert(node->type == NODE_UNARY_EXPRESSION);
-               assert(node->u.unary_expression.type == UNARY_STRING);
-               assert((node->u.unary_expression.link == UNARY_LINK_UNKNOWN)
-                       ^ (i != 0));
+               if (node->type != NODE_UNARY_EXPRESSION
+                               || node->u.unary_expression.type != UNARY_STRING
+                               || !((node->u.unary_expression.link != UNARY_LINK_UNKNOWN)
+                                       ^ (i == 0)))
+                       return NULL;
                switch (node->u.unary_expression.link) {
                case UNARY_DOTLINK:
                        g_string_append(str, ".");
@@ -129,10 +130,11 @@ GQuark get_map_clock_name_value(struct bt_list_head *head)
        bt_list_for_each_entry(node, head, siblings) {
                char *src_string;
 
-               assert(node->type == NODE_UNARY_EXPRESSION);
-               assert(node->u.unary_expression.type == UNARY_STRING);
-               assert((node->u.unary_expression.link == UNARY_LINK_UNKNOWN)
-                       ^ (i != 0));
+               if (node->type != NODE_UNARY_EXPRESSION
+                       || node->u.unary_expression.type != UNARY_STRING
+                       || !((node->u.unary_expression.link != UNARY_LINK_UNKNOWN)
+                               ^ (i == 0)))
+                       return 0;
                /* needs to be chained with . */
                switch (node->u.unary_expression.link) {
                case UNARY_DOTLINK:
@@ -184,10 +186,11 @@ int get_unary_unsigned(struct bt_list_head *head, uint64_t *value)
        int i = 0;
 
        bt_list_for_each_entry(node, head, siblings) {
-               assert(node->type == NODE_UNARY_EXPRESSION);
-               assert(node->u.unary_expression.type == UNARY_UNSIGNED_CONSTANT);
-               assert(node->u.unary_expression.link == UNARY_LINK_UNKNOWN);
-               assert(i == 0);
+               if (node->type != NODE_UNARY_EXPRESSION
+                               || node->u.unary_expression.type != UNARY_UNSIGNED_CONSTANT
+                               || node->u.unary_expression.link != UNARY_LINK_UNKNOWN
+                               || i != 0)
+                       return -EINVAL;
                *value = node->u.unary_expression.u.unsigned_constant;
                i++;
        }
@@ -215,11 +218,11 @@ int get_unary_signed(struct bt_list_head *head, int64_t *value)
        int i = 0;
 
        bt_list_for_each_entry(node, head, siblings) {
-               assert(node->type == NODE_UNARY_EXPRESSION);
-               assert(node->u.unary_expression.type == UNARY_UNSIGNED_CONSTANT
-                       || node->u.unary_expression.type == UNARY_SIGNED_CONSTANT);
-               assert(node->u.unary_expression.link == UNARY_LINK_UNKNOWN);
-               assert(i == 0);
+               if (node->type != NODE_UNARY_EXPRESSION
+                               || (node->u.unary_expression.type != UNARY_UNSIGNED_CONSTANT && node->u.unary_expression.type != UNARY_SIGNED_CONSTANT)
+                               || node->u.unary_expression.link != UNARY_LINK_UNKNOWN
+                               || i != 0)
+                       return -EINVAL;
                switch (node->u.unary_expression.type) {
                case UNARY_UNSIGNED_CONSTANT:
                        *value = (int64_t) node->u.unary_expression.u.unsigned_constant;
@@ -228,7 +231,7 @@ int get_unary_signed(struct bt_list_head *head, int64_t *value)
                        *value = node->u.unary_expression.u.signed_constant;
                        break;
                default:
-                       assert(0);
+                       return -EINVAL;
                }
                i++;
        }
@@ -245,12 +248,13 @@ int get_unary_uuid(struct bt_list_head *head, unsigned char *uuid)
        bt_list_for_each_entry(node, head, siblings) {
                const char *src_string;
 
-               assert(node->type == NODE_UNARY_EXPRESSION);
-               assert(node->u.unary_expression.type == UNARY_STRING);
-               assert(node->u.unary_expression.link == UNARY_LINK_UNKNOWN);
-               assert(i == 0);
+               if (node->type != NODE_UNARY_EXPRESSION
+                               || node->u.unary_expression.type != UNARY_STRING
+                               || node->u.unary_expression.link != UNARY_LINK_UNKNOWN
+                               || i != 0)
+                       return -EINVAL;
                src_string = node->u.unary_expression.u.string;
-               ret = babeltrace_uuid_parse(src_string, uuid);
+               ret = bt_uuid_parse(src_string, uuid);
        }
        return ret;
 }
@@ -263,16 +267,25 @@ struct ctf_stream_declaration *trace_stream_lookup(struct ctf_trace *trace, uint
        return g_ptr_array_index(trace->streams, stream_id);
 }
 
+static
+struct ctf_event_declaration *stream_event_lookup(struct ctf_stream_declaration *stream, uint64_t event_id)
+{
+       if (stream->events_by_id->len <= event_id)
+               return NULL;
+       return g_ptr_array_index(stream->events_by_id, event_id);
+}
+
 static
 struct ctf_clock *trace_clock_lookup(struct ctf_trace *trace, GQuark clock_name)
 {
-       return g_hash_table_lookup(trace->clocks, (gpointer) (unsigned long) clock_name);
+       return g_hash_table_lookup(trace->parent.clocks, (gpointer) (unsigned long) clock_name);
 }
 
 static
 int visit_type_specifier(FILE *fd, struct ctf_node *type_specifier, GString *str)
 {
-       assert(type_specifier->type == NODE_TYPE_SPECIFIER);
+       if (type_specifier->type != NODE_TYPE_SPECIFIER)
+               return -EINVAL;
 
        switch (type_specifier->u.type_specifier.type) {
        case TYPESPEC_VOID:
@@ -426,7 +439,9 @@ struct bt_declaration *ctf_type_declarator_visit(FILE *fd, int depth,
         */
 
        if (node_type_declarator) {
-               assert(node_type_declarator->u.type_declarator.type != TYPEDEC_UNKNOWN);
+               if (node_type_declarator->u.type_declarator.type == TYPEDEC_UNKNOWN) {
+                       return NULL;
+               }
 
                /* TODO: gcc bitfields not supported yet. */
                if (node_type_declarator->u.type_declarator.bitfield_len != NULL) {
@@ -500,7 +515,9 @@ struct bt_declaration *ctf_type_declarator_visit(FILE *fd, int depth,
                }
                first = _bt_list_first_entry(&node_type_declarator->u.type_declarator.u.nested.length, 
                                struct ctf_node, siblings);
-               assert(first->type == NODE_UNARY_EXPRESSION);
+               if (first->type != NODE_UNARY_EXPRESSION) {
+                       return NULL;
+               }
 
                switch (first->u.unary_expression.type) {
                case UNARY_UNSIGNED_CONSTANT:
@@ -526,6 +543,8 @@ struct bt_declaration *ctf_type_declarator_visit(FILE *fd, int depth,
                        char *length_name = concatenate_unary_strings(&node_type_declarator->u.type_declarator.u.nested.length);
                        struct declaration_sequence *sequence_declaration;
 
+                       if (!length_name)
+                               return NULL;
                        sequence_declaration = bt_sequence_declaration_new(length_name, nested_declaration, declaration_scope);
                        if (!sequence_declaration) {
                                fprintf(fd, "[error] %s: cannot create sequence declaration.\n", __func__);
@@ -538,7 +557,7 @@ struct bt_declaration *ctf_type_declarator_visit(FILE *fd, int depth,
                        break;
                }
                default:
-                       assert(0);
+                       return NULL;
                }
 
                /* Pass it as content of outer container */
@@ -637,7 +656,7 @@ int ctf_typedef_visit(FILE *fd, int depth, struct declaration_scope *scope,
        bt_list_for_each_entry(iter, type_declarators, siblings) {
                struct bt_declaration *type_declaration;
                int ret;
-       
+
                type_declaration = ctf_type_declarator_visit(fd, depth,
                                        type_specifier_list,
                                        &identifier, iter,
@@ -773,7 +792,7 @@ int ctf_struct_declaration_list_visit(FILE *fd, int depth,
                break;
        default:
                fprintf(fd, "[error] %s: unexpected node type %d\n", __func__, (int) iter->type);
-               assert(0);
+               return -EINVAL;
        }
        return 0;
 }
@@ -817,7 +836,7 @@ int ctf_variant_declaration_list_visit(FILE *fd, int depth,
                break;
        default:
                fprintf(fd, "[error] %s: unexpected node type %d\n", __func__, (int) iter->type);
-               assert(0);
+               return -EINVAL;
        }
        return 0;
 }
@@ -838,7 +857,8 @@ struct bt_declaration *ctf_declaration_struct_visit(FILE *fd,
         * declaration: ref is only taken upon definition.
         */
        if (!has_body) {
-               assert(name);
+               if (!name)
+                       return NULL;
                struct_declaration =
                        bt_lookup_struct_declaration(g_quark_from_string(name),
                                                  declaration_scope);
@@ -852,7 +872,6 @@ struct bt_declaration *ctf_declaration_struct_visit(FILE *fd,
                if (name) {
                        if (bt_lookup_struct_declaration(g_quark_from_string(name),
                                                      declaration_scope)) {
-                               
                                fprintf(fd, "[error] %s: struct %s already declared in scope\n", __func__, name);
                                return NULL;
                        }
@@ -863,7 +882,6 @@ struct bt_declaration *ctf_declaration_struct_visit(FILE *fd,
                        ret = get_unary_unsigned(min_align, &min_align_value);
                        if (ret) {
                                fprintf(fd, "[error] %s: unexpected unary expression for structure \"align\" attribute\n", __func__);
-                               ret = -EINVAL;
                                goto error;
                        }
                }
@@ -883,7 +901,8 @@ struct bt_declaration *ctf_declaration_struct_visit(FILE *fd,
                        ret = bt_register_struct_declaration(g_quark_from_string(name),
                                        struct_declaration,
                                        declaration_scope);
-                       assert(!ret);
+                       if (ret)
+                               return NULL;
                }
                return &struct_declaration->p;
        }
@@ -910,7 +929,8 @@ struct bt_declaration *ctf_declaration_variant_visit(FILE *fd,
         * declaration: ref is only taken upon definition.
         */
        if (!has_body) {
-               assert(name);
+               if (!name)
+                       return NULL;
                untagged_variant_declaration =
                        bt_lookup_variant_declaration(g_quark_from_string(name),
                                                   declaration_scope);
@@ -921,7 +941,6 @@ struct bt_declaration *ctf_declaration_variant_visit(FILE *fd,
                if (name) {
                        if (bt_lookup_variant_declaration(g_quark_from_string(name),
                                                       declaration_scope)) {
-                               
                                fprintf(fd, "[error] %s: variant %s already declared in scope\n", __func__, name);
                                return NULL;
                        }
@@ -941,7 +960,8 @@ struct bt_declaration *ctf_declaration_variant_visit(FILE *fd,
                        ret = bt_register_variant_declaration(g_quark_from_string(name),
                                        untagged_variant_declaration,
                                        declaration_scope);
-                       assert(!ret);
+                       if (ret)
+                               return NULL;
                }
        }
        /*
@@ -973,13 +993,14 @@ int ctf_enumerator_list_visit(FILE *fd, int depth,
 
        q = g_quark_from_string(enumerator->u.enumerator.id);
        if (enum_declaration->integer_declaration->signedness) {
-               int64_t start, end;
+               int64_t start = 0, end = 0;
                int nr_vals = 0;
 
                bt_list_for_each_entry(iter, &enumerator->u.enumerator.values, siblings) {
                        int64_t *target;
 
-                       assert(iter->type == NODE_UNARY_EXPRESSION);
+                       if (iter->type != NODE_UNARY_EXPRESSION)
+                               return -EINVAL;
                        if (nr_vals == 0)
                                target = &start;
                        else
@@ -1009,13 +1030,14 @@ int ctf_enumerator_list_visit(FILE *fd, int depth,
                last->u.s = end + 1;
                bt_enum_signed_insert(enum_declaration, start, end, q);
        } else {
-               uint64_t start, end;
+               uint64_t start = 0, end = 0;
                int nr_vals = 0;
 
                bt_list_for_each_entry(iter, &enumerator->u.enumerator.values, siblings) {
                        uint64_t *target;
 
-                       assert(iter->type == NODE_UNARY_EXPRESSION);
+                       if (iter->type != NODE_UNARY_EXPRESSION)
+                               return -EINVAL;
                        if (nr_vals == 0)
                                target = &start;
                        else
@@ -1074,7 +1096,8 @@ struct bt_declaration *ctf_declaration_enum_visit(FILE *fd, int depth,
         * declaration: ref is only taken upon definition.
         */
        if (!has_body) {
-               assert(name);
+               if (!name)
+                       return NULL;
                enum_declaration =
                        bt_lookup_enum_declaration(g_quark_from_string(name),
                                                declaration_scope);
@@ -1086,7 +1109,6 @@ struct bt_declaration *ctf_declaration_enum_visit(FILE *fd, int depth,
                if (name) {
                        if (bt_lookup_enum_declaration(g_quark_from_string(name),
                                                    declaration_scope)) {
-                               
                                fprintf(fd, "[error] %s: enum %s already declared in scope\n", __func__, name);
                                return NULL;
                        }
@@ -1135,7 +1157,8 @@ struct bt_declaration *ctf_declaration_enum_visit(FILE *fd, int depth,
                        ret = bt_register_enum_declaration(g_quark_from_string(name),
                                        enum_declaration,
                                        declaration_scope);
-                       assert(!ret);
+                       if (ret)
+                               return NULL;
                        bt_declaration_unref(&enum_declaration->p);
                }
                return &enum_declaration->p;
@@ -1158,12 +1181,16 @@ struct bt_declaration *ctf_declaration_type_specifier_visit(FILE *fd, int depth,
 
        str = g_string_new("");
        ret = visit_type_specifier_list(fd, type_specifier_list, str);
-       if (ret)
+       if (ret) {
+               (void) g_string_free(str, TRUE);
                return NULL;
+       }
        str_c = g_string_free(str, FALSE);
        id_q = g_quark_from_string(str_c);
        g_free(str_c);
        declaration = bt_lookup_declaration(id_q, declaration_scope);
+       if (!declaration)
+               return NULL;
        bt_declaration_ref(declaration);
        return declaration;
 }
@@ -1209,7 +1236,7 @@ int get_boolean(FILE *fd, int depth, struct ctf_node *unary_expression)
                fprintf(fd, "[error] %s: unexpected unary expression type\n",
                        __func__);
                return -EINVAL;
-       } 
+       }
 
 }
 
@@ -1282,7 +1309,8 @@ struct bt_declaration *ctf_declaration_integer_visit(FILE *fd, int depth,
 
                left = _bt_list_first_entry(&expression->u.ctf_expression.left, struct ctf_node, siblings);
                right = _bt_list_first_entry(&expression->u.ctf_expression.right, struct ctf_node, siblings);
-               assert(left->u.unary_expression.type == UNARY_STRING);
+               if (left->u.unary_expression.type != UNARY_STRING)
+                       return NULL;
                if (!strcmp(left->u.unary_expression.u.string, "signed")) {
                        signedness = get_boolean(fd, depth, right);
                        if (signedness < 0)
@@ -1298,6 +1326,11 @@ struct bt_declaration *ctf_declaration_integer_visit(FILE *fd, int depth,
                                return NULL;
                        }
                        size = right->u.unary_expression.u.unsigned_constant;
+                       if (!size) {
+                               fprintf(fd, "[error] %s: integer size: expecting non-zero constant\n",
+                                       __func__);
+                               return NULL;
+                       }
                        has_size = 1;
                } else if (!strcmp(left->u.unary_expression.u.string, "align")) {
                        if (right->u.unary_expression.type != UNARY_UNSIGNED_CONSTANT) {
@@ -1454,9 +1487,9 @@ struct bt_declaration *ctf_declaration_floating_point_visit(FILE *fd, int depth,
                struct ctf_trace *trace)
 {
        struct ctf_node *expression;
-       uint64_t alignment = 1, exp_dig = 0, mant_dig = 0,
-               byte_order = trace->byte_order;
-       int has_alignment = 0, has_exp_dig = 0, has_mant_dig = 0;
+       uint64_t alignment = 1, exp_dig = 0, mant_dig = 0;
+       int byte_order = trace->byte_order, has_alignment = 0,
+               has_exp_dig = 0, has_mant_dig = 0;
        struct declaration_float *float_declaration;
 
        bt_list_for_each_entry(expression, expressions, siblings) {
@@ -1464,7 +1497,8 @@ struct bt_declaration *ctf_declaration_floating_point_visit(FILE *fd, int depth,
 
                left = _bt_list_first_entry(&expression->u.ctf_expression.left, struct ctf_node, siblings);
                right = _bt_list_first_entry(&expression->u.ctf_expression.right, struct ctf_node, siblings);
-               assert(left->u.unary_expression.type == UNARY_STRING);
+               if (left->u.unary_expression.type != UNARY_STRING)
+                       return NULL;
                if (!strcmp(left->u.unary_expression.u.string, "byte_order")) {
                        byte_order = get_byte_order(fd, depth, right, trace);
                        if (byte_order < 0)
@@ -1542,7 +1576,8 @@ struct bt_declaration *ctf_declaration_string_visit(FILE *fd, int depth,
 
                left = _bt_list_first_entry(&expression->u.ctf_expression.left, struct ctf_node, siblings);
                right = _bt_list_first_entry(&expression->u.ctf_expression.right, struct ctf_node, siblings);
-               assert(left->u.unary_expression.type == UNARY_STRING);
+               if (left->u.unary_expression.type != UNARY_STRING)
+                       return NULL;
                if (!strcmp(left->u.unary_expression.u.string, "encoding")) {
                        if (right->u.unary_expression.type != UNARY_STRING) {
                                fprintf(fd, "[error] %s: encoding: expecting string\n",
@@ -1572,11 +1607,13 @@ struct bt_declaration *ctf_type_specifier_list_visit(FILE *fd,
        struct ctf_node *first;
        struct ctf_node *node;
 
-       assert(type_specifier_list->type == NODE_TYPE_SPECIFIER_LIST);
+       if (type_specifier_list->type != NODE_TYPE_SPECIFIER_LIST)
+               return NULL;
 
        first = _bt_list_first_entry(&type_specifier_list->u.type_specifier_list.head, struct ctf_node, siblings);
 
-       assert(first->type == NODE_TYPE_SPECIFIER);
+       if (first->type != NODE_TYPE_SPECIFIER)
+               return NULL;
 
        node = first->u.type_specifier.node;
 
@@ -1665,6 +1702,8 @@ int ctf_event_declaration_visit(FILE *fd, int depth, struct ctf_node *node, stru
                char *left;
 
                left = concatenate_unary_strings(&node->u.ctf_expression.left);
+               if (!left)
+                       return -EINVAL;
                if (!strcmp(left, "name")) {
                        char *right;
 
@@ -1814,6 +1853,10 @@ int ctf_event_visit(FILE *fd, int depth, struct ctf_node *node,
        struct ctf_event_declaration *event;
        struct bt_ctf_event_decl *event_decl;
 
+       if (node->visited)
+               return 0;
+       node->visited = 1;
+
        event_decl = g_new0(struct bt_ctf_event_decl, 1);
        event = &event_decl->parent;
        event->declaration_scope = bt_new_declaration_scope(parent_declaration_scope);
@@ -1853,6 +1896,13 @@ int ctf_event_visit(FILE *fd, int depth, struct ctf_node *node,
                fprintf(fd, "[error] %s: missing id field in event declaration\n", __func__);
                goto error;
        }
+       /* Disallow re-using the same event ID in the same stream */
+       if (stream_event_lookup(event->stream, event->id)) {
+               ret = -EPERM;
+               fprintf(fd, "[error] %s: event ID %" PRIu64 " used more than once in stream %" PRIu64 "\n",
+                       __func__, event->id, event->stream_id);
+               goto error;
+       }
        if (event->stream->events_by_id->len <= event->id)
                g_ptr_array_set_size(event->stream->events_by_id, event->id + 1);
        g_ptr_array_index(event->stream->events_by_id, event->id) = event;
@@ -1901,6 +1951,8 @@ int ctf_stream_declaration_visit(FILE *fd, int depth, struct ctf_node *node, str
                char *left;
 
                left = concatenate_unary_strings(&node->u.ctf_expression.left);
+               if (!left)
+                       return -EINVAL;
                if (!strcmp(left, "id")) {
                        if (CTF_STREAM_FIELD_IS_SET(stream, stream_id)) {
                                fprintf(fd, "[error] %s: id already declared in stream declaration\n", __func__);
@@ -2002,6 +2054,12 @@ int ctf_stream_visit(FILE *fd, int depth, struct ctf_node *node,
        struct ctf_node *iter;
        struct ctf_stream_declaration *stream;
 
+       if (node) {
+               if (node->visited)
+                       return 0;
+               node->visited = 1;
+       }
+
        stream = g_new0(struct ctf_stream_declaration, 1);
        stream->declaration_scope = bt_new_declaration_scope(parent_declaration_scope);
        stream->events_by_id = g_ptr_array_new();
@@ -2081,6 +2139,8 @@ int ctf_trace_declaration_visit(FILE *fd, int depth, struct ctf_node *node, stru
                char *left;
 
                left = concatenate_unary_strings(&node->u.ctf_expression.left);
+               if (!left)
+                       return -EINVAL;
                if (!strcmp(left, "major")) {
                        if (CTF_TRACE_FIELD_IS_SET(trace, major)) {
                                fprintf(fd, "[error] %s: major already declared in trace declaration\n", __func__);
@@ -2117,7 +2177,7 @@ int ctf_trace_declaration_visit(FILE *fd, int depth, struct ctf_node *node, stru
                                goto error;
                        }
                        if (CTF_TRACE_FIELD_IS_SET(trace, uuid)
-                               && babeltrace_uuid_compare(uuid, trace->uuid)) {
+                               && bt_uuid_compare(uuid, trace->uuid)) {
                                fprintf(fd, "[error] %s: uuid mismatch\n", __func__);
                                ret = -EPERM;
                                goto error;
@@ -2131,8 +2191,10 @@ int ctf_trace_declaration_visit(FILE *fd, int depth, struct ctf_node *node, stru
 
                        right = _bt_list_first_entry(&node->u.ctf_expression.right, struct ctf_node, siblings);
                        byte_order = get_trace_byte_order(fd, depth, right);
-                       if (byte_order < 0)
-                               return -EINVAL;
+                       if (byte_order < 0) {
+                               ret = -EINVAL;
+                               goto error;
+                       }
 
                        if (CTF_TRACE_FIELD_IS_SET(trace, byte_order)
                                && byte_order != trace->byte_order) {
@@ -2197,8 +2259,13 @@ int ctf_trace_visit(FILE *fd, int depth, struct ctf_node *node, struct ctf_trace
        int ret = 0;
        struct ctf_node *iter;
 
+       if (!trace->restart_root_decl && node->visited)
+               return 0;
+       node->visited = 1;
+
        if (trace->declaration_scope)
                return -EEXIST;
+
        trace->declaration_scope = bt_new_declaration_scope(trace->root_declaration_scope);
        trace->streams = g_ptr_array_new();
        trace->event_declarations = g_ptr_array_new();
@@ -2258,6 +2325,8 @@ int ctf_clock_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                char *left;
 
                left = concatenate_unary_strings(&node->u.ctf_expression.left);
+               if (!left)
+                       return -EINVAL;
                if (!strcmp(left, "name")) {
                        char *right;
 
@@ -2335,7 +2404,7 @@ int ctf_clock_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                                ret = -EPERM;
                                goto error;
                        }
-                       ret = get_unary_unsigned(&node->u.ctf_expression.right, &clock->offset_s);
+                       ret = get_unary_signed(&node->u.ctf_expression.right, &clock->offset_s);
                        if (ret) {
                                fprintf(fd, "[error] %s: unexpected unary expression for clock offset_s\n", __func__);
                                ret = -EINVAL;
@@ -2347,7 +2416,7 @@ int ctf_clock_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                                ret = -EPERM;
                                goto error;
                        }
-                       ret = get_unary_unsigned(&node->u.ctf_expression.right, &clock->offset);
+                       ret = get_unary_signed(&node->u.ctf_expression.right, &clock->offset);
                        if (ret) {
                                fprintf(fd, "[error] %s: unexpected unary expression for clock offset\n", __func__);
                                ret = -EINVAL;
@@ -2364,6 +2433,7 @@ int ctf_clock_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                                goto error;
                        }
                        clock->absolute = ret;
+                       ret = 0;
                } else {
                        fprintf(fd, "[warning] %s: attribute \"%s\" is unknown in clock declaration.\n", __func__, left);
                }
@@ -2387,6 +2457,10 @@ int ctf_clock_visit(FILE *fd, int depth, struct ctf_node *node, struct ctf_trace
        struct ctf_node *iter;
        struct ctf_clock *clock;
 
+       if (node->visited)
+               return 0;
+       node->visited = 1;
+
        clock = g_new0(struct ctf_clock, 1);
        /* Default clock frequency is set to 1000000000 */
        clock->freq = 1000000000ULL;
@@ -2411,13 +2485,13 @@ int ctf_clock_visit(FILE *fd, int depth, struct ctf_node *node, struct ctf_trace
                fprintf(fd, "[error] %s: missing name field in clock declaration\n", __func__);
                goto error;
        }
-       if (g_hash_table_size(trace->clocks) > 0) {
+       if (g_hash_table_size(trace->parent.clocks) > 0) {
                fprintf(fd, "[error] Only CTF traces with a single clock description are supported by this babeltrace version.\n");
                ret = -EINVAL;
                goto error;
        }
-       trace->single_clock = clock;
-       g_hash_table_insert(trace->clocks, (gpointer) (unsigned long) clock->name, clock);
+       trace->parent.single_clock = clock;
+       g_hash_table_insert(trace->parent.clocks, (gpointer) (unsigned long) clock->name, clock);
        return 0;
 
 error:
@@ -2451,8 +2525,8 @@ void ctf_clock_default(FILE *fd, int depth, struct ctf_trace *trace)
                clock->absolute = 0;    /* Not an absolute reference across traces */
        }
 
-       trace->single_clock = clock;
-       g_hash_table_insert(trace->clocks, (gpointer) (unsigned long) clock->name, clock);
+       trace->parent.single_clock = clock;
+       g_hash_table_insert(trace->parent.clocks, (gpointer) (unsigned long) clock->name, clock);
 }
 
 static
@@ -2476,6 +2550,8 @@ int ctf_callsite_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                char *left;
 
                left = concatenate_unary_strings(&node->u.ctf_expression.left);
+               if (!left)
+                       return -EINVAL;
                if (!strcmp(left, "name")) {
                        char *right;
 
@@ -2575,6 +2651,10 @@ int ctf_callsite_visit(FILE *fd, int depth, struct ctf_node *node, struct ctf_tr
        struct ctf_callsite *callsite;
        struct ctf_callsite_dups *cs_dups;
 
+       if (node->visited)
+               return 0;
+       node->visited = 1;
+
        callsite = g_new0(struct ctf_callsite, 1);
        bt_list_for_each_entry(iter, &node->u.callsite.declaration_list, siblings) {
                ret = ctf_callsite_declaration_visit(fd, depth + 1, iter, callsite, trace);
@@ -2647,6 +2727,8 @@ int ctf_env_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                char *left;
 
                left = concatenate_unary_strings(&node->u.ctf_expression.left);
+               if (!left)
+                       return -EINVAL;
                if (!strcmp(left, "vpid")) {
                        uint64_t v;
 
@@ -2762,6 +2844,11 @@ int ctf_env_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                                char *right;
 
                                right = concatenate_unary_strings(&node->u.ctf_expression.right);
+                               if (!right) {
+                                       fprintf(fd, "[warning] %s: unexpected unary expression for env\n", __func__);
+                                       ret = -EINVAL;
+                                       goto error;
+                               }
                                printf_verbose("env.%s = \"%s\"\n", left, right);
                                g_free(right);
                        } else if (is_unary_unsigned(&node->u.ctf_expression.right)) {
@@ -2769,14 +2856,16 @@ int ctf_env_declaration_visit(FILE *fd, int depth, struct ctf_node *node,
                                int ret;
 
                                ret = get_unary_unsigned(&node->u.ctf_expression.right, &v);
-                               assert(ret == 0);
+                               if (ret)
+                                       goto error;
                                printf_verbose("env.%s = %" PRIu64 "\n", left, v);
                        } else if (is_unary_signed(&node->u.ctf_expression.right)) {
                                int64_t v;
                                int ret;
 
                                ret = get_unary_signed(&node->u.ctf_expression.right, &v);
-                               assert(ret == 0);
+                               if (ret)
+                                       goto error;
                                printf_verbose("env.%s = %" PRId64 "\n", left, v);
                        } else {
                                printf_verbose("%s: attribute \"%s\" has unknown type.\n", __func__, left);
@@ -2800,6 +2889,10 @@ int ctf_env_visit(FILE *fd, int depth, struct ctf_node *node, struct ctf_trace *
        int ret = 0;
        struct ctf_node *iter;
 
+       if (node->visited)
+               return 0;
+       node->visited = 1;
+
        trace->env.vpid = -1;
        trace->env.procname[0] = '\0';
        trace->env.hostname[0] = '\0';
@@ -2821,6 +2914,10 @@ int ctf_root_declaration_visit(FILE *fd, int depth, struct ctf_node *node, struc
 {
        int ret = 0;
 
+       if (!trace->restart_root_decl && node->visited)
+               return 0;
+       node->visited = 1;
+
        switch (node->type) {
        case NODE_TYPEDEF:
                ret = ctf_typedef_visit(fd, depth + 1,
@@ -2866,12 +2963,11 @@ int ctf_visitor_construct_metadata(FILE *fd, int depth, struct ctf_node *node,
 {
        int ret = 0;
        struct ctf_node *iter;
-       int env_clock_done = 0;
 
        printf_verbose("CTF visitor: metadata construction...\n");
        trace->byte_order = byte_order;
-       trace->clocks = g_hash_table_new_full(g_direct_hash, g_direct_equal,
-                               NULL, clock_free);
+       trace->parent.clocks = g_hash_table_new_full(g_direct_hash,
+                               g_direct_equal, NULL, clock_free);
        trace->callsites = g_hash_table_new_full(g_direct_hash, g_direct_equal,
                                NULL, callsite_free);
 
@@ -2880,24 +2976,21 @@ retry:
 
        switch (node->type) {
        case NODE_ROOT:
-               if (!env_clock_done) {
-                       /*
-                        * declarations need to query clock hash table,
-                        * so clock need to be treated first.
-                        */
-                       if (bt_list_empty(&node->u.root.clock)) {
-                               ctf_clock_default(fd, depth + 1, trace);
-                       } else {
-                               bt_list_for_each_entry(iter, &node->u.root.clock, siblings) {
-                                       ret = ctf_clock_visit(fd, depth + 1, iter,
-                                                             trace);
-                                       if (ret) {
-                                               fprintf(fd, "[error] %s: clock declaration error\n", __func__);
-                                               goto error;
-                                       }
+               /*
+                * declarations need to query clock hash table,
+                * so clock need to be treated first.
+                */
+               if (bt_list_empty(&node->u.root.clock)) {
+                       ctf_clock_default(fd, depth + 1, trace);
+               } else {
+                       bt_list_for_each_entry(iter, &node->u.root.clock, siblings) {
+                               ret = ctf_clock_visit(fd, depth + 1, iter,
+                                                     trace);
+                               if (ret) {
+                                       fprintf(fd, "[error] %s: clock declaration error\n", __func__);
+                                       goto error;
                                }
                        }
-                       env_clock_done = 1;
                }
                bt_list_for_each_entry(iter, &node->u.root.declaration_list,
                                        siblings) {
@@ -2910,6 +3003,7 @@ retry:
                bt_list_for_each_entry(iter, &node->u.root.trace, siblings) {
                        ret = ctf_trace_visit(fd, depth + 1, iter, trace);
                        if (ret == -EINTR) {
+                               trace->restart_root_decl = 1;
                                bt_free_declaration_scope(trace->root_declaration_scope);
                                /*
                                 * Need to restart creation of type
@@ -2923,6 +3017,7 @@ retry:
                                goto error;
                        }
                }
+               trace->restart_root_decl = 0;
                bt_list_for_each_entry(iter, &node->u.root.callsite, siblings) {
                        ret = ctf_callsite_visit(fd, depth + 1, iter,
                                              trace);
@@ -2973,7 +3068,7 @@ retry:
 error:
        bt_free_declaration_scope(trace->root_declaration_scope);
        g_hash_table_destroy(trace->callsites);
-       g_hash_table_destroy(trace->clocks);
+       g_hash_table_destroy(trace->parent.clocks);
        return ret;
 }
 
@@ -3072,7 +3167,7 @@ int ctf_destroy_metadata(struct ctf_trace *trace)
        bt_free_declaration_scope(trace->declaration_scope);
 
        g_hash_table_destroy(trace->callsites);
-       g_hash_table_destroy(trace->clocks);
+       g_hash_table_destroy(trace->parent.clocks);
 
        metadata_stream = container_of(trace->metadata, struct ctf_file_stream, parent);
        g_free(metadata_stream);
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