ir: consolidate reference counting functions
[babeltrace.git] / formats / ctf / ir / event-fields.c
index 80a6655b50f81c40fea196831a55b1d9d463a127..2fb783c31ccbd51dacd0ff027f365501c5a3acf2 100644 (file)
@@ -29,6 +29,8 @@
 #include <babeltrace/ctf-writer/event-fields.h>
 #include <babeltrace/ctf-ir/event-fields-internal.h>
 #include <babeltrace/ctf-ir/event-types-internal.h>
+#include <babeltrace/ctf-ir/common-internal.h>
+#include <babeltrace/ctf-ir/ref.h>
 #include <babeltrace/compiler.h>
 
 #define PACKET_LEN_INCREMENT   (getpagesize() * 8 * CHAR_BIT)
@@ -57,7 +59,7 @@ static
 struct bt_ctf_field *bt_ctf_field_string_create(struct bt_ctf_field_type *);
 
 static
-void bt_ctf_field_destroy(struct bt_ctf_ref *);
+void bt_ctf_field_destroy(struct bt_ref *);
 static
 void bt_ctf_field_integer_destroy(struct bt_ctf_field *);
 static
@@ -250,7 +252,7 @@ struct bt_ctf_field *bt_ctf_field_create(struct bt_ctf_field_type *type)
        /* The type's declaration can't change after this point */
        bt_ctf_field_type_freeze(type);
        bt_ctf_field_type_get(type);
-       bt_ctf_ref_init(&field->ref_count);
+       bt_ctf_base_init(field, bt_ctf_field_destroy);
        field->type = type;
 error:
        return field;
@@ -258,16 +260,12 @@ error:
 
 void bt_ctf_field_get(struct bt_ctf_field *field)
 {
-       if (field) {
-               bt_ctf_ref_get(&field->ref_count);
-       }
+       bt_ctf_get(field);
 }
 
 void bt_ctf_field_put(struct bt_ctf_field *field)
 {
-       if (field) {
-               bt_ctf_ref_put(&field->ref_count, bt_ctf_field_destroy);
-       }
+       bt_ctf_put(field);
 }
 
 struct bt_ctf_field_type *bt_ctf_field_get_type(struct bt_ctf_field *field)
@@ -524,12 +522,14 @@ struct bt_ctf_field *bt_ctf_field_array_get_field(struct bt_ctf_field *field,
        }
 
        new_field = bt_ctf_field_create(field_type);
-       bt_ctf_field_get(new_field);
        array->elements->pdata[(size_t)index] = new_field;
 end:
        if (field_type) {
                bt_ctf_field_type_put(field_type);
        }
+       if (new_field) {
+               bt_ctf_field_get(new_field);
+       }
        return new_field;
 }
 
@@ -557,12 +557,14 @@ struct bt_ctf_field *bt_ctf_field_sequence_get_field(struct bt_ctf_field *field,
        }
 
        new_field = bt_ctf_field_create(field_type);
-       bt_ctf_field_get(new_field);
        sequence->elements->pdata[(size_t)index] = new_field;
 end:
        if (field_type) {
                bt_ctf_field_type_put(field_type);
        }
+       if (new_field) {
+               bt_ctf_field_get(new_field);
+       }
        return new_field;
 }
 
@@ -601,6 +603,31 @@ struct bt_ctf_field *bt_ctf_field_variant_get_field(struct bt_ctf_field *field,
        }
 
        tag_enum_value = tag_enum_integer->definition.value._signed;
+
+       /*
+        * If the variant currently has a tag and a payload, and if the
+        * requested tag value is the same as the current one, return
+        * the current payload instead of creating a fresh one.
+        */
+       if (variant->tag && variant->payload) {
+               struct bt_ctf_field *cur_tag_container = NULL;
+               struct bt_ctf_field_integer *cur_tag_enum_integer;
+               int64_t cur_tag_value;
+
+               cur_tag_container =
+                       bt_ctf_field_enumeration_get_container(variant->tag);
+               cur_tag_enum_integer = container_of(cur_tag_container,
+                       struct bt_ctf_field_integer, parent);
+               bt_ctf_field_put(cur_tag_container);
+               cur_tag_value = cur_tag_enum_integer->definition.value._signed;
+
+               if (cur_tag_value == tag_enum_value) {
+                       new_field = variant->payload;
+                       bt_ctf_field_get(new_field);
+                       goto end;
+               }
+       }
+
        field_type = bt_ctf_field_type_variant_get_field_type_signed(
                variant_type, tag_enum_value);
        if (!field_type) {
@@ -623,6 +650,31 @@ end:
        return new_field;
 }
 
+struct bt_ctf_field *bt_ctf_field_variant_get_current_field(
+               struct bt_ctf_field *variant_field)
+{
+       struct bt_ctf_field *current_field = NULL;
+       struct bt_ctf_field_variant *variant;
+
+       if (!variant_field ||
+               bt_ctf_field_type_get_type_id(variant_field->type) !=
+                       CTF_TYPE_VARIANT) {
+               goto end;
+       }
+
+       variant = container_of(variant_field, struct bt_ctf_field_variant,
+               parent);
+
+       if (variant->payload) {
+               current_field = variant->payload;
+               bt_ctf_field_get(current_field);
+               goto end;
+       }
+
+end:
+       return current_field;
+}
+
 struct bt_ctf_field *bt_ctf_field_enumeration_get_container(
        struct bt_ctf_field *field)
 {
@@ -1052,7 +1104,6 @@ end:
        return ret;
 }
 
-BT_HIDDEN
 struct bt_ctf_field *bt_ctf_field_copy(struct bt_ctf_field *field)
 {
        int ret;
@@ -1073,6 +1124,7 @@ struct bt_ctf_field *bt_ctf_field_copy(struct bt_ctf_field *field)
                goto end;
        }
 
+       copy->payload_set = field->payload_set;
        ret = field_copy_funcs[type_id](field, copy);
        if (ret) {
                bt_ctf_field_put(copy);
@@ -1221,9 +1273,10 @@ struct bt_ctf_field *bt_ctf_field_string_create(struct bt_ctf_field_type *type)
 }
 
 static
-void bt_ctf_field_destroy(struct bt_ctf_ref *ref)
+void bt_ctf_field_destroy(struct bt_ref *ref)
 {
        struct bt_ctf_field *field;
+       struct bt_ctf_base *base;
        struct bt_ctf_field_type *type;
        enum ctf_type_id type_id;
 
@@ -1231,7 +1284,8 @@ void bt_ctf_field_destroy(struct bt_ctf_ref *ref)
                return;
        }
 
-       field = container_of(ref, struct bt_ctf_field, ref_count);
+       base = container_of(ref, struct bt_ctf_base, ref_count);
+       field = container_of(base, struct bt_ctf_field, base);
        type = field->type;
        type_id = bt_ctf_field_type_get_type_id(type);
        if (type_id <= CTF_TYPE_UNKNOWN ||
@@ -1340,7 +1394,9 @@ void bt_ctf_field_sequence_destroy(struct bt_ctf_field *field)
        }
 
        sequence = container_of(field, struct bt_ctf_field_sequence, parent);
-       g_ptr_array_free(sequence->elements, TRUE);
+       if (sequence->elements) {
+               g_ptr_array_free(sequence->elements, TRUE);
+       }
        bt_ctf_field_put(sequence->length);
        g_free(sequence);
 }
@@ -1902,13 +1958,19 @@ int bt_ctf_field_structure_copy(struct bt_ctf_field *src,
        g_ptr_array_set_size(struct_dst->fields, struct_src->fields->len);
 
        for (i = 0; i < struct_src->fields->len; i++) {
-               struct bt_ctf_field *field_copy = bt_ctf_field_copy(
-                       g_ptr_array_index(struct_src->fields, i));
+               struct bt_ctf_field *field =
+                       g_ptr_array_index(struct_src->fields, i);
+               struct bt_ctf_field *field_copy = NULL;
 
-               if (!field_copy) {
-                       ret = -1;
-                       goto end;
+               if (field) {
+                       field_copy = bt_ctf_field_copy(field);
+
+                       if (!field_copy) {
+                               ret = -1;
+                               goto end;
+                       }
                }
+
                g_ptr_array_index(struct_dst->fields, i) = field_copy;
        }
 end:
@@ -1955,13 +2017,19 @@ int bt_ctf_field_array_copy(struct bt_ctf_field *src,
 
        g_ptr_array_set_size(array_dst->elements, array_src->elements->len);
        for (i = 0; i < array_src->elements->len; i++) {
-               struct bt_ctf_field *field_copy = bt_ctf_field_copy(
-                       g_ptr_array_index(array_src->elements, i));
+               struct bt_ctf_field *field =
+                       g_ptr_array_index(array_src->elements, i);
+               struct bt_ctf_field *field_copy = NULL;
 
-               if (!field_copy) {
-                       ret = -1;
-                       goto end;
+               if (field) {
+                       field_copy = bt_ctf_field_copy(field);
+
+                       if (!field_copy) {
+                               ret = -1;
+                               goto end;
+                       }
                }
+
                g_ptr_array_index(array_dst->elements, i) = field_copy;
        }
 end:
@@ -1974,20 +2042,52 @@ int bt_ctf_field_sequence_copy(struct bt_ctf_field *src,
 {
        int ret = 0, i;
        struct bt_ctf_field_sequence *sequence_src, *sequence_dst;
+       struct bt_ctf_field *src_length;
+       struct bt_ctf_field *dst_length;
 
        sequence_src = container_of(src, struct bt_ctf_field_sequence, parent);
        sequence_dst = container_of(dst, struct bt_ctf_field_sequence, parent);
 
-       g_ptr_array_set_size(sequence_dst->elements,
-               sequence_src->elements->len);
+       src_length = bt_ctf_field_sequence_get_length(src);
+
+       if (!src_length) {
+               /* no length set yet: keep destination sequence empty */
+               goto end;
+       }
+
+       /* copy source length */
+       dst_length = bt_ctf_field_copy(src_length);
+       bt_ctf_field_put(src_length);
+
+       if (!dst_length) {
+               ret = -1;
+               goto end;
+       }
+
+       /* this will initialize the destination sequence's internal array */
+       ret = bt_ctf_field_sequence_set_length(dst, dst_length);
+       bt_ctf_field_put(dst_length);
+
+       if (ret) {
+               goto end;
+       }
+
+       assert(sequence_dst->elements->len == sequence_src->elements->len);
+
        for (i = 0; i < sequence_src->elements->len; i++) {
-               struct bt_ctf_field *field_copy = bt_ctf_field_copy(
-                       g_ptr_array_index(sequence_src->elements, i));
+               struct bt_ctf_field *field =
+                       g_ptr_array_index(sequence_src->elements, i);
+               struct bt_ctf_field *field_copy = NULL;
 
-               if (!field_copy) {
-                       ret = -1;
-                       goto end;
+               if (field) {
+                       field_copy = bt_ctf_field_copy(field);
+
+                       if (!field_copy) {
+                               ret = -1;
+                               goto end;
+                       }
                }
+
                g_ptr_array_index(sequence_dst->elements, i) = field_copy;
        }
 end:
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