Cleanup: Move `debug-info` in its own sub-directory
[babeltrace.git] / plugins / lttng-utils / debug-info / trace-ir-metadata-field-class-copy.c
diff --git a/plugins/lttng-utils/debug-info/trace-ir-metadata-field-class-copy.c b/plugins/lttng-utils/debug-info/trace-ir-metadata-field-class-copy.c
new file mode 100644 (file)
index 0000000..df6e26d
--- /dev/null
@@ -0,0 +1,735 @@
+/*
+ * Babeltrace - Trace IR field copy
+ *
+ * Copyright (c) 2015-2019 EfficiOS Inc. and Linux Foundation
+ * Copyright (c) 2018 Philippe Proulx <pproulx@efficios.com>
+ * Copyright (c) 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define BT_LOG_TAG "PLUGIN-LTTNG-UTILS-DEBUG-INFO-TRACE-IR-METADATA-FC-COPY"
+#include "logging.h"
+
+#include <babeltrace/assert-internal.h>
+#include <babeltrace/common-internal.h>
+#include <babeltrace/compiler-internal.h>
+#include <babeltrace/babeltrace.h>
+
+#include "trace-ir-metadata-copy.h"
+#include "trace-ir-metadata-field-class-copy.h"
+
+/*
+ * This fonction walks througth the nested structures field class to resolve a
+ * field path object. A field path is made of indexes inside possibly nested
+ * structures ultimately leading to a field class.
+ */
+static
+const bt_field_class *walk_field_path(const bt_field_path *fp,
+               const bt_field_class *fc)
+{
+       uint64_t i, fp_index_count;
+       const bt_field_class *curr_fc;
+
+       BT_ASSERT(bt_field_class_get_type(fc) == BT_FIELD_CLASS_TYPE_STRUCTURE);
+       BT_LOGD("Walking field path on field class: fp-addr=%p, fc-addr=%p",
+                       fp, fc);
+
+       fp_index_count = bt_field_path_get_index_count(fp);
+       curr_fc = fc;
+       for (i = 0; i < fp_index_count; i++) {
+               bt_field_class_type fc_type = bt_field_class_get_type(curr_fc);
+               uint64_t curr_index = bt_field_path_get_index_by_index(fp, i);
+
+               switch (fc_type) {
+               case BT_FIELD_CLASS_TYPE_STRUCTURE:
+               {
+                       const bt_field_class_structure_member *member =
+                               bt_field_class_structure_borrow_member_by_index_const(
+                                       curr_fc, curr_index);
+                       curr_fc = bt_field_class_structure_member_borrow_field_class_const(
+                               member);
+                       break;
+               }
+               case BT_FIELD_CLASS_TYPE_VARIANT:
+               {
+                       const bt_field_class_variant_option *option =
+                               bt_field_class_variant_borrow_option_by_index_const(
+                                       curr_fc, curr_index);
+                       curr_fc = bt_field_class_variant_option_borrow_field_class_const(
+                               option);
+                       break;
+               }
+               default:
+                       abort();
+               }
+       }
+
+       return curr_fc;
+}
+
+static
+const bt_field_class *resolve_field_path_to_field_class(const bt_field_path *fp,
+               struct trace_ir_metadata_maps *md_maps)
+{
+       struct field_class_resolving_context *fc_resolving_ctx;
+       const bt_field_class *fc;
+       bt_scope fp_scope;
+
+       BT_LOGD("Resolving field path: fp-addr=%p", fp);
+
+       fc_resolving_ctx = md_maps->fc_resolving_ctx;
+       fp_scope = bt_field_path_get_root_scope(fp);
+
+       switch (fp_scope) {
+       case BT_SCOPE_PACKET_CONTEXT:
+               fc = walk_field_path(fp, fc_resolving_ctx->packet_context);
+               break;
+       case BT_SCOPE_EVENT_COMMON_CONTEXT:
+               fc = walk_field_path(fp, fc_resolving_ctx->event_common_context);
+               break;
+       case BT_SCOPE_EVENT_SPECIFIC_CONTEXT:
+               fc = walk_field_path(fp, fc_resolving_ctx->event_specific_context);
+               break;
+       case BT_SCOPE_EVENT_PAYLOAD:
+               fc = walk_field_path(fp, fc_resolving_ctx->event_payload);
+               break;
+       default:
+               abort();
+       }
+
+       return fc;
+}
+
+static inline
+void field_class_integer_set_props(const bt_field_class *input_fc,
+               bt_field_class *output_fc)
+{
+       bt_field_class_integer_set_preferred_display_base(output_fc,
+                       bt_field_class_integer_get_preferred_display_base(input_fc));
+       bt_field_class_integer_set_field_value_range(output_fc,
+                       bt_field_class_integer_get_field_value_range(input_fc));
+}
+
+static inline
+int field_class_unsigned_integer_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       BT_LOGD("Copying content of unsigned integer field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       field_class_integer_set_props(in_field_class, out_field_class);
+
+       BT_LOGD("Copied content of unsigned integer field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+       return 0;
+}
+
+static inline
+int field_class_signed_integer_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       BT_LOGD("Copying content of signed integer field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       field_class_integer_set_props(in_field_class, out_field_class);
+
+       BT_LOGD("Copied content of signed integer field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+       return 0;
+}
+
+BT_HIDDEN
+int field_class_unsigned_enumeration_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       uint64_t i, enum_mapping_count;
+       int ret = 0;
+
+       BT_LOGD("Copying content of unsigned enumeration field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       /* Copy properties of the inner integer. */
+       field_class_integer_set_props(in_field_class, out_field_class);
+
+       /* Copy all enumeration entries. */
+       enum_mapping_count = bt_field_class_enumeration_get_mapping_count(in_field_class);
+       for (i = 0; i < enum_mapping_count; i++) {
+               const char *label;
+               const bt_field_class_unsigned_enumeration_mapping_ranges *ranges;
+               uint64_t range_index, range_count;
+
+               /* Get the ranges and the range count. */
+               bt_field_class_unsigned_enumeration_borrow_mapping_by_index_const(
+                               in_field_class, i, &label, &ranges);
+               range_count =
+                       bt_field_class_unsigned_enumeration_mapping_ranges_get_range_count(
+                                       ranges);
+               /*
+                * Iterate over all the ranges to add them to copied field
+                * class.
+                */
+               for (range_index = 0; range_index < range_count; range_index++) {
+                       uint64_t lower, upper;
+                       bt_field_class_status status;
+                       bt_field_class_unsigned_enumeration_mapping_ranges_get_range_by_index(
+                                       ranges, range_index, &lower, &upper);
+
+                       BT_LOGD("Copying range in enumeration field class: "
+                                       "label=%s, lower=%"PRId64", upper=%"PRId64,
+                                       label, lower, upper);
+
+                       /* Add the label and its range to the copy field class. */
+                       status = bt_field_class_unsigned_enumeration_map_range(
+                                       out_field_class, label, lower, upper);
+
+                       if (status != BT_FIELD_CLASS_STATUS_OK) {
+                               BT_LOGE_STR("Failed to add range to unsigned "
+                                               "enumeration.");
+                               BT_FIELD_CLASS_PUT_REF_AND_RESET(out_field_class);
+                               ret = -1;
+                               goto error;
+                       }
+               }
+       }
+
+       BT_LOGD("Copied content of unsigned enumeration field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+error:
+       return ret;
+}
+
+static inline
+int field_class_signed_enumeration_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       uint64_t i, enum_mapping_count;
+       int ret = 0;
+
+       BT_LOGD("Copying content of signed enumeration field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       /* Copy properties of the inner integer. */
+       field_class_integer_set_props(in_field_class, out_field_class);
+
+       /* Copy all enumeration entries. */
+       enum_mapping_count =
+               bt_field_class_enumeration_get_mapping_count(in_field_class);
+       for (i = 0; i < enum_mapping_count; i++) {
+               const char *label;
+               const bt_field_class_signed_enumeration_mapping_ranges *ranges;
+               uint64_t range_index, range_count;
+
+               /* Get the ranges and the range count. */
+               bt_field_class_signed_enumeration_borrow_mapping_by_index_const(
+                               in_field_class, i, &label, &ranges);
+               range_count =
+                       bt_field_class_signed_enumeration_mapping_ranges_get_range_count(
+                                       ranges);
+               /*
+                * Iterate over all the ranges to add them to copied field
+                * class.
+                */
+               for (range_index = 0; range_index < range_count; range_index++) {
+                       int64_t lower, upper;
+                       bt_field_class_status status;
+                       bt_field_class_signed_enumeration_mapping_ranges_get_range_by_index(
+                                       ranges, range_index, &lower, &upper);
+
+                       BT_LOGD("Copying range in enumeration field class: "
+                                       "label=%s, lower=%ld, upper=%ld",
+                                       label, lower, upper);
+
+                       /* Add the label and its range to the copy field class. */
+                       status = bt_field_class_signed_enumeration_map_range(
+                                       out_field_class, label, lower, upper);
+                       if (status != BT_FIELD_CLASS_STATUS_OK) {
+                               BT_LOGE_STR("Failed to add range to signed "
+                                               "enumeration.");
+                               BT_FIELD_CLASS_PUT_REF_AND_RESET(out_field_class);
+                               ret = -1;
+                               goto error;
+                       }
+               }
+       }
+
+       BT_LOGD("Copied content of signed enumeration field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+error:
+       return ret;
+}
+
+static inline
+int field_class_real_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       BT_LOGD("Copying content of real field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       bt_field_class_real_set_is_single_precision(out_field_class,
+                       bt_field_class_real_is_single_precision(in_field_class));
+
+       BT_LOGD("Copied content real field class: in-fc-addr=%p, "
+                       "out-fc-addr=%p", in_field_class, out_field_class);
+
+       return 0;
+}
+
+static inline
+int field_class_structure_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       uint64_t i, struct_member_count;
+       bt_field_class_status status;
+       int ret = 0;
+
+       BT_LOGD("Copying content of structure field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+       /* Get the number of member in that struct. */
+       struct_member_count =
+               bt_field_class_structure_get_member_count(in_field_class);
+
+       /* Iterate over all the members of the struct. */
+       for (i = 0; i < struct_member_count; i++) {
+               const bt_field_class_structure_member *member;
+               const char *member_name;
+               const bt_field_class *member_fc;
+               bt_field_class *out_member_field_class;
+
+               member = bt_field_class_structure_borrow_member_by_index_const(
+                       in_field_class, i);
+               member_fc = bt_field_class_structure_member_borrow_field_class_const(
+                       member);
+               member_name = bt_field_class_structure_member_get_name(member);
+               BT_LOGD("Copying structure field class's field: "
+                       "index=%" PRId64 ", "
+                       "member-fc-addr=%p, field-name=\"%s\"",
+                       i, member_fc, member_name);
+
+               out_member_field_class = create_field_class_copy(md_maps,
+                               member_fc);
+               if (!out_member_field_class) {
+                       BT_LOGE("Cannot copy structure field class's field: "
+                               "index=%" PRId64 ", "
+                               "field-fc-addr=%p, field-name=\"%s\"",
+                               i, member_fc, member_name);
+                       ret = -1;
+                       goto error;
+               }
+               ret = copy_field_class_content(md_maps, member_fc,
+                               out_member_field_class);
+               if (ret) {
+                       goto error;
+               }
+
+               status = bt_field_class_structure_append_member(out_field_class,
+                               member_name, out_member_field_class);
+               if (status != BT_FIELD_CLASS_STATUS_OK) {
+                       BT_LOGE("Cannot append structure field class's field: "
+                               "index=%" PRId64 ", "
+                               "field-fc-addr=%p, field-name=\"%s\"",
+                               i, member_fc, member_name);
+                       BT_FIELD_CLASS_PUT_REF_AND_RESET(out_member_field_class);
+                       ret = -1;
+                       goto error;
+               }
+       }
+
+       BT_LOGD("Copied structure field class: original-fc-addr=%p, copy-fc-addr=%p",
+               in_field_class, out_field_class);
+
+error:
+       return ret;
+}
+
+static inline
+int field_class_variant_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       bt_field_class *out_tag_field_class;
+       uint64_t i, variant_option_count;
+       const bt_field_path *tag_fp;
+       const bt_field_class *tag_fc;
+       int ret = 0;
+
+       BT_LOGD("Copying content of variant field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       tag_fp = bt_field_class_variant_borrow_selector_field_path_const(
+                       in_field_class);
+       if (tag_fp) {
+               tag_fc = resolve_field_path_to_field_class(tag_fp,
+                               md_maps);
+
+               out_tag_field_class = g_hash_table_lookup(
+                               md_maps->field_class_map, tag_fc);
+               if (!out_tag_field_class) {
+                       BT_LOGE_STR("Cannot find the tag field class.");
+                       ret = -1;
+                       goto error;
+               }
+               bt_field_class_variant_set_selector_field_class(out_field_class,
+                               out_tag_field_class);
+       }
+
+       variant_option_count =
+               bt_field_class_variant_get_option_count(in_field_class);
+       for (i = 0; i < variant_option_count; i++) {
+               const bt_field_class *option_fc;
+               const char *option_name;
+               bt_field_class *out_option_field_class;
+               bt_field_class_status status;
+               const bt_field_class_variant_option *option;
+
+               option = bt_field_class_variant_borrow_option_by_index_const(
+                       in_field_class, i);
+               option_fc = bt_field_class_variant_option_borrow_field_class_const(
+                       option);
+               option_name = bt_field_class_variant_option_get_name(option);
+               out_option_field_class = create_field_class_copy_internal(
+                               md_maps, option_fc);
+               if (!out_option_field_class) {
+                       BT_LOGE_STR("Cannot copy field class.");
+                       ret = -1;
+                       goto error;
+               }
+               ret = copy_field_class_content_internal(md_maps, option_fc,
+                               out_option_field_class);
+               if (ret) {
+                       BT_LOGE_STR("Error copying content of option variant "
+                                       "field class'");
+                       goto error;
+               }
+
+               status = bt_field_class_variant_append_option(
+                               out_field_class, option_name,
+                               out_option_field_class);
+               if (status != BT_FIELD_CLASS_STATUS_OK) {
+                       BT_LOGE_STR("Cannot append option to variant field class'");
+                       BT_FIELD_CLASS_PUT_REF_AND_RESET(out_tag_field_class);
+                       ret = -1;
+                       goto error;
+               }
+       }
+
+       BT_LOGD("Copied content of variant field class: in-fc-addr=%p, "
+               "out-fc-addr=%p", in_field_class, out_field_class);
+
+error:
+       return ret;
+}
+
+static inline
+int field_class_static_array_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       BT_LOGD("Copying content of static array field class: in-fc-addr=%p, "
+                       "out-fc-addr=%p", in_field_class, out_field_class);
+       /*
+        * There is no content to copy. Keep this function call anyway for
+        * logging purposes.
+        */
+       BT_LOGD("Copied content of static array field class: in-fc-addr=%p, "
+                       "out-fc-addr=%p", in_field_class, out_field_class);
+
+       return 0;
+}
+
+static inline
+int field_class_dynamic_array_copy(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       const bt_field_class *len_fc;
+       const bt_field_path *len_fp;
+       bt_field_class_status status;
+       bt_field_class *out_len_field_class;
+       int ret = 0;
+
+       BT_LOGD("Copying content of dynamic array field class: "
+                       "in-fc-addr=%p, out-fc-addr=%p",
+                       in_field_class, out_field_class);
+
+       len_fp = bt_field_class_dynamic_array_borrow_length_field_path_const(
+                       in_field_class);
+
+       if (len_fp) {
+               BT_LOGD("Copying dynamic array length field class using "
+                               "field path: in-len-fp=%p", len_fp);
+               len_fc = resolve_field_path_to_field_class(
+                               len_fp, md_maps);
+               out_len_field_class = g_hash_table_lookup(
+                               md_maps->field_class_map, len_fc);
+               if (!out_len_field_class) {
+                       BT_LOGE_STR("Cannot find the output matching length"
+                                       "field class.");
+                       ret = -1;
+                       goto error;
+               }
+
+               status = bt_field_class_dynamic_array_set_length_field_class(
+                               out_field_class, out_len_field_class);
+               if (status != BT_FIELD_CLASS_STATUS_OK) {
+                       BT_LOGE_STR("Cannot set dynamic array field class' "
+                                       "length field class.");
+                       BT_FIELD_CLASS_PUT_REF_AND_RESET(out_len_field_class);
+                       ret = -1;
+                       goto error;
+               }
+       }
+
+       BT_LOGD("Copied dynamic array field class: in-fc-addr=%p, "
+                       "out-fc-addr=%p", in_field_class, out_field_class);
+
+error:
+       return ret;
+}
+
+static inline
+int field_class_string_copy(struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       BT_LOGD("Copying content of string field class: in-fc-addr=%p, "
+                       "out-fc-addr=%p", in_field_class, out_field_class);
+       /*
+        * There is no content to copy. Keep this function call anyway for
+        * logging purposes.
+        */
+       BT_LOGD("Copied content of string field class: in-fc-addr=%p, "
+                       "out-fc-addr=%p", in_field_class, out_field_class);
+
+       return 0;
+}
+
+static
+bt_field_class *copy_field_class_array_element(struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_elem_fc)
+{
+       int ret;
+       bt_field_class *out_elem_fc =
+               create_field_class_copy_internal(md_maps, in_elem_fc);
+       if (!out_elem_fc) {
+               BT_LOGE("Error creating output elem field class "
+                               "from input elem field class for static array: "
+                               "in-fc-addr=%p", in_elem_fc);
+               goto error;
+       }
+
+       ret = copy_field_class_content_internal(md_maps, in_elem_fc, out_elem_fc);
+       if (ret) {
+               BT_LOGE("Error creating output elem field class "
+                               "from input elem field class for static array: "
+                               "in-fc-addr=%p", in_elem_fc);
+               BT_FIELD_CLASS_PUT_REF_AND_RESET(out_elem_fc);
+               goto error;
+       }
+
+error:
+       return out_elem_fc;
+}
+
+BT_HIDDEN
+bt_field_class *create_field_class_copy_internal(struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class)
+{
+       bt_field_class *out_field_class = NULL;
+
+       BT_LOGD("Creating bare field class based on field class: in-fc-addr=%p",
+                       in_field_class);
+
+       switch(bt_field_class_get_type(in_field_class)) {
+       case BT_FIELD_CLASS_TYPE_UNSIGNED_INTEGER:
+               out_field_class = bt_field_class_unsigned_integer_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_SIGNED_INTEGER:
+               out_field_class = bt_field_class_signed_integer_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_UNSIGNED_ENUMERATION:
+               out_field_class = bt_field_class_unsigned_enumeration_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_SIGNED_ENUMERATION:
+               out_field_class = bt_field_class_signed_enumeration_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_REAL:
+               out_field_class = bt_field_class_real_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_STRING:
+               out_field_class = bt_field_class_string_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_STRUCTURE:
+               out_field_class = bt_field_class_structure_create(
+                               md_maps->output_trace_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_STATIC_ARRAY:
+       {
+               const bt_field_class *in_elem_fc =
+                       bt_field_class_array_borrow_element_field_class_const(
+                                       in_field_class);
+               uint64_t array_len =
+                       bt_field_class_static_array_get_length(in_field_class);
+
+               bt_field_class *out_elem_fc = copy_field_class_array_element(
+                               md_maps, in_elem_fc);
+               if (!out_elem_fc) {
+                       out_field_class = NULL;
+                       goto error;
+               }
+
+               out_field_class = bt_field_class_static_array_create(
+                               md_maps->output_trace_class,
+                               out_elem_fc, array_len);
+               break;
+       }
+       case BT_FIELD_CLASS_TYPE_DYNAMIC_ARRAY:
+       {
+               const bt_field_class *in_elem_fc =
+                       bt_field_class_array_borrow_element_field_class_const(
+                                       in_field_class);
+
+               bt_field_class *out_elem_fc = copy_field_class_array_element(
+                               md_maps, in_elem_fc);
+               if (!out_elem_fc) {
+                       out_field_class = NULL;
+                       goto error;
+               }
+
+               out_field_class = bt_field_class_dynamic_array_create(
+                               md_maps->output_trace_class,
+                               out_elem_fc);
+               break;
+       }
+       case BT_FIELD_CLASS_TYPE_VARIANT:
+               out_field_class = bt_field_class_variant_create(
+                               md_maps->output_trace_class);
+               break;
+       default:
+               abort();
+       }
+
+       /*
+        * Add mapping from in_field_class to out_field_class. This simplifies
+        * the resolution of field paths in variant and dynamic array field
+        * classes.
+        */
+       g_hash_table_insert(md_maps->field_class_map,
+                       (gpointer) in_field_class, out_field_class);
+
+error:
+       if(out_field_class){
+               BT_LOGD("Created bare field class based on field class: in-fc-addr=%p, "
+                               "out-fc-addr=%p", in_field_class, out_field_class);
+       } else {
+               BT_LOGE("Error creating output field class from input field "
+                       "class: in-fc-addr=%p", in_field_class);
+       }
+
+       return out_field_class;
+}
+
+BT_HIDDEN
+int copy_field_class_content_internal(
+               struct trace_ir_metadata_maps *md_maps,
+               const bt_field_class *in_field_class,
+               bt_field_class *out_field_class)
+{
+       int ret = 0;
+       switch(bt_field_class_get_type(in_field_class)) {
+       case BT_FIELD_CLASS_TYPE_UNSIGNED_INTEGER:
+               ret = field_class_unsigned_integer_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_SIGNED_INTEGER:
+               ret = field_class_signed_integer_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_UNSIGNED_ENUMERATION:
+               ret = field_class_unsigned_enumeration_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_SIGNED_ENUMERATION:
+               ret = field_class_signed_enumeration_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_REAL:
+               ret = field_class_real_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_STRING:
+               ret = field_class_string_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_STRUCTURE:
+               ret = field_class_structure_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_STATIC_ARRAY:
+               ret = field_class_static_array_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_DYNAMIC_ARRAY:
+               ret = field_class_dynamic_array_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       case BT_FIELD_CLASS_TYPE_VARIANT:
+               ret = field_class_variant_copy(md_maps,
+                               in_field_class, out_field_class);
+               break;
+       default:
+               abort();
+       }
+
+       return ret;
+}
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