#include <lttng/ust-tracer.h>
#include <ust-context-provider.h>
#include <lttng/urcu/pointer.h>
+#include <lttng/urcu/urcu-ust.h>
#include <usterr-signal-safe.h>
#include <ust-helper.h>
#include <stddef.h>
#include <string.h>
#include <assert.h>
+#include <limits.h>
#include "tracepoint-internal.h"
#include "context-internal.h"
* same context performed by the same thread return the same result.
*/
-int lttng_find_context(struct lttng_ctx *ctx, const char *name)
+int lttng_find_context(struct lttng_ust_ctx *ctx, const char *name)
{
unsigned int i;
const char *subname;
+ if (!ctx)
+ return 0;
if (strncmp(name, "$ctx.", strlen("$ctx.")) == 0) {
subname = name + strlen("$ctx.");
} else {
}
for (i = 0; i < ctx->nr_fields; i++) {
/* Skip allocated (but non-initialized) contexts */
- if (!ctx->fields[i].event_field.name)
+ if (!ctx->fields[i].event_field->name)
continue;
- if (!strcmp(ctx->fields[i].event_field.name, subname))
+ if (!strcmp(ctx->fields[i].event_field->name, subname))
return 1;
}
return 0;
}
-int lttng_get_context_index(struct lttng_ctx *ctx, const char *name)
+int lttng_get_context_index(struct lttng_ust_ctx *ctx, const char *name)
{
unsigned int i;
const char *subname;
}
for (i = 0; i < ctx->nr_fields; i++) {
/* Skip allocated (but non-initialized) contexts */
- if (!ctx->fields[i].event_field.name)
+ if (!ctx->fields[i].event_field->name)
continue;
- if (!strcmp(ctx->fields[i].event_field.name, subname))
+ if (!strcmp(ctx->fields[i].event_field->name, subname))
return i;
}
return -1;
}
-static int lttng_find_context_provider(struct lttng_ctx *ctx, const char *name)
+static int lttng_find_context_provider(struct lttng_ust_ctx *ctx, const char *name)
{
unsigned int i;
for (i = 0; i < ctx->nr_fields; i++) {
/* Skip allocated (but non-initialized) contexts */
- if (!ctx->fields[i].event_field.name)
+ if (!ctx->fields[i].event_field->name)
continue;
- if (!strncmp(ctx->fields[i].event_field.name, name,
+ if (!strncmp(ctx->fields[i].event_field->name, name,
strlen(name)))
return 1;
}
/*
* Note: as we append context information, the pointer location may change.
+ * lttng_ust_context_add_field leaves the new last context initialized to NULL.
*/
-struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p)
+static
+int lttng_ust_context_add_field(struct lttng_ust_ctx **ctx_p)
{
- struct lttng_ctx_field *field;
- struct lttng_ctx *ctx;
+ struct lttng_ust_ctx *ctx;
if (!*ctx_p) {
- *ctx_p = zmalloc(sizeof(struct lttng_ctx));
+ *ctx_p = zmalloc(sizeof(struct lttng_ust_ctx));
if (!*ctx_p)
- return NULL;
+ return -ENOMEM;
(*ctx_p)->largest_align = 1;
}
ctx = *ctx_p;
if (ctx->nr_fields + 1 > ctx->allocated_fields) {
- struct lttng_ctx_field *new_fields;
+ struct lttng_ust_ctx_field *new_fields;
ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
- new_fields = zmalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field));
+ new_fields = zmalloc(ctx->allocated_fields * sizeof(*new_fields));
if (!new_fields)
- return NULL;
+ return -ENOMEM;
+ /* Copy elements */
if (ctx->fields)
memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
free(ctx->fields);
ctx->fields = new_fields;
}
- field = &ctx->fields[ctx->nr_fields];
ctx->nr_fields++;
- return field;
+ return 0;
}
-int lttng_context_add_rcu(struct lttng_ctx **ctx_p,
- const struct lttng_ctx_field *f)
+static size_t get_type_max_align(const struct lttng_ust_type_common *type)
{
- struct lttng_ctx *old_ctx = *ctx_p, *new_ctx = NULL;
- struct lttng_ctx_field *new_fields = NULL;
- struct lttng_ctx_field *nf;
+ switch (type->type) {
+ case lttng_ust_type_integer:
+ return lttng_ust_get_type_integer(type)->alignment;
+ case lttng_ust_type_string:
+ return CHAR_BIT;
+ case lttng_ust_type_dynamic:
+ return 0;
+ case lttng_ust_type_enum:
+ return get_type_max_align(lttng_ust_get_type_enum(type)->container_type);
+ case lttng_ust_type_array:
+ return max_t(size_t, get_type_max_align(lttng_ust_get_type_array(type)->elem_type),
+ lttng_ust_get_type_array(type)->alignment);
+ case lttng_ust_type_sequence:
+ return max_t(size_t, get_type_max_align(lttng_ust_get_type_sequence(type)->elem_type),
+ lttng_ust_get_type_sequence(type)->alignment);
+ case lttng_ust_type_struct:
+ {
+ unsigned int i;
+ size_t field_align = 0;
+ const struct lttng_ust_type_struct *struct_type = lttng_ust_get_type_struct(type);
+
+ for (i = 0; i < struct_type->nr_fields; i++) {
+ field_align = max_t(size_t,
+ get_type_max_align(struct_type->fields[i]->type),
+ field_align);
+ }
+ return field_align;
+ }
+ default:
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+}
+
+/*
+ * lttng_context_update() should be called at least once between context
+ * modification and trace start.
+ */
+static
+void lttng_context_update(struct lttng_ust_ctx *ctx)
+{
+ int i;
+ size_t largest_align = 8; /* in bits */
+
+ for (i = 0; i < ctx->nr_fields; i++) {
+ size_t field_align = 8;
+
+ field_align = get_type_max_align(ctx->fields[i].event_field->type);
+ largest_align = max_t(size_t, largest_align, field_align);
+ }
+ ctx->largest_align = largest_align >> 3; /* bits to bytes */
+}
+
+int lttng_ust_context_append_rcu(struct lttng_ust_ctx **ctx_p,
+ const struct lttng_ust_ctx_field *f)
+{
+ struct lttng_ust_ctx *old_ctx = *ctx_p, *new_ctx = NULL;
+ struct lttng_ust_ctx_field *new_fields = NULL;
+ int ret;
if (old_ctx) {
- new_ctx = zmalloc(sizeof(struct lttng_ctx));
+ new_ctx = zmalloc(sizeof(struct lttng_ust_ctx));
if (!new_ctx)
return -ENOMEM;
*new_ctx = *old_ctx;
- new_fields = zmalloc(new_ctx->allocated_fields
- * sizeof(struct lttng_ctx_field));
+ new_fields = zmalloc(new_ctx->allocated_fields * sizeof(*new_fields));
if (!new_fields) {
free(new_ctx);
return -ENOMEM;
}
+ /* Copy elements */
memcpy(new_fields, old_ctx->fields,
sizeof(*old_ctx->fields) * old_ctx->nr_fields);
new_ctx->fields = new_fields;
}
- nf = lttng_append_context(&new_ctx);
- if (!nf) {
+ ret = lttng_ust_context_add_field(&new_ctx);
+ if (ret) {
free(new_fields);
free(new_ctx);
- return -ENOMEM;
+ return ret;
}
- *nf = *f;
+ /* Taking ownership of f. */
+ new_ctx->fields[new_ctx->nr_fields - 1] = *f;
lttng_context_update(new_ctx);
lttng_ust_rcu_assign_pointer(*ctx_p, new_ctx);
- lttng_ust_synchronize_trace();
+ lttng_ust_urcu_synchronize_rcu();
if (old_ctx) {
free(old_ctx->fields);
free(old_ctx);
return 0;
}
-/*
- * lttng_context_update() should be called at least once between context
- * modification and trace start.
- */
-void lttng_context_update(struct lttng_ctx *ctx)
-{
- int i;
- size_t largest_align = 8; /* in bits */
-
- for (i = 0; i < ctx->nr_fields; i++) {
- struct lttng_type *type;
- size_t field_align = 8;
-
- type = &ctx->fields[i].event_field.type;
- switch (type->atype) {
- case atype_integer:
- field_align = type->u.integer.alignment;
- break;
- case atype_array:
- {
- struct lttng_basic_type *btype;
-
- btype = &type->u.legacy.array.elem_type;
- switch (btype->atype) {
- case atype_integer:
- field_align = btype->u.basic.integer.alignment;
- break;
- case atype_string:
- break;
-
- case atype_array:
- case atype_array_nestable:
- case atype_sequence:
- case atype_sequence_nestable:
- default:
- WARN_ON_ONCE(1);
- break;
- }
- break;
- }
- case atype_array_nestable:
- {
- const struct lttng_type *nested_type;
-
- nested_type = type->u.array_nestable.elem_type;
- switch (nested_type->atype) {
- case atype_integer:
- field_align = nested_type->u.integer.alignment;
- break;
- case atype_string:
- break;
-
- case atype_array:
- case atype_array_nestable:
- case atype_sequence:
- case atype_sequence_nestable:
- default:
- WARN_ON_ONCE(1);
- break;
- }
- field_align = max_t(size_t, field_align,
- type->u.array_nestable.alignment);
- break;
- }
- case atype_sequence:
- {
- struct lttng_basic_type *btype;
-
- btype = &type->u.legacy.sequence.length_type;
- switch (btype->atype) {
- case atype_integer:
- field_align = btype->u.basic.integer.alignment;
- break;
-
- case atype_string:
- case atype_array:
- case atype_array_nestable:
- case atype_sequence:
- case atype_sequence_nestable:
- default:
- WARN_ON_ONCE(1);
- break;
- }
-
- btype = &type->u.legacy.sequence.elem_type;
- switch (btype->atype) {
- case atype_integer:
- field_align = max_t(size_t,
- field_align,
- btype->u.basic.integer.alignment);
- break;
-
- case atype_string:
- break;
-
- case atype_array:
- case atype_array_nestable:
- case atype_sequence:
- case atype_sequence_nestable:
- default:
- WARN_ON_ONCE(1);
- break;
- }
- break;
- }
- case atype_sequence_nestable:
- {
- const struct lttng_type *nested_type;
-
- nested_type = type->u.sequence_nestable.elem_type;
- switch (nested_type->atype) {
- case atype_integer:
- field_align = nested_type->u.integer.alignment;
- break;
-
- case atype_string:
- break;
-
- case atype_array:
- case atype_array_nestable:
- case atype_sequence:
- case atype_sequence_nestable:
- default:
- WARN_ON_ONCE(1);
- break;
- }
- field_align = max_t(size_t, field_align,
- type->u.sequence_nestable.alignment);
- break;
- }
- case atype_string:
- break;
- case atype_dynamic:
- break;
- case atype_enum:
- case atype_enum_nestable:
- default:
- WARN_ON_ONCE(1);
- break;
- }
- largest_align = max_t(size_t, largest_align, field_align);
- }
- ctx->largest_align = largest_align >> 3; /* bits to bytes */
-}
-
-/*
- * Remove last context field.
- */
-void lttng_remove_context_field(struct lttng_ctx **ctx_p,
- struct lttng_ctx_field *field)
+int lttng_ust_context_append(struct lttng_ust_ctx **ctx_p,
+ const struct lttng_ust_ctx_field *f)
{
- struct lttng_ctx *ctx;
+ int ret;
- ctx = *ctx_p;
- ctx->nr_fields--;
- assert(&ctx->fields[ctx->nr_fields] == field);
- assert(field->field_name == NULL);
- memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field));
+ ret = lttng_ust_context_add_field(ctx_p);
+ if (ret)
+ return ret;
+ (*ctx_p)->fields[(*ctx_p)->nr_fields - 1] = *f;
+ lttng_context_update(*ctx_p);
+ return 0;
}
-void lttng_destroy_context(struct lttng_ctx *ctx)
+void lttng_destroy_context(struct lttng_ust_ctx *ctx)
{
int i;
for (i = 0; i < ctx->nr_fields; i++) {
if (ctx->fields[i].destroy)
ctx->fields[i].destroy(&ctx->fields[i]);
- free(ctx->fields[i].field_name);
}
free(ctx->fields);
free(ctx);
* a single RCU read-side critical section see either all old, or all
* new handlers.
*/
-int lttng_ust_context_set_provider_rcu(struct lttng_ctx **_ctx,
+int lttng_ust_context_set_provider_rcu(struct lttng_ust_ctx **_ctx,
const char *name,
- size_t (*get_size)(struct lttng_ctx_field *field, size_t offset),
- void (*record)(struct lttng_ctx_field *field,
- struct lttng_ust_lib_ring_buffer_ctx *ctx,
- struct lttng_channel *chan),
- void (*get_value)(struct lttng_ctx_field *field,
- struct lttng_ctx_value *value))
+ size_t (*get_size)(void *priv, size_t offset),
+ void (*record)(void *priv, struct lttng_ust_lib_ring_buffer_ctx *ctx,
+ struct lttng_ust_channel_buffer *chan),
+ void (*get_value)(void *priv, struct lttng_ust_ctx_value *value),
+ void *priv)
{
int i, ret;
- struct lttng_ctx *ctx = *_ctx, *new_ctx;
- struct lttng_ctx_field *new_fields;
+ struct lttng_ust_ctx *ctx = *_ctx, *new_ctx;
+ struct lttng_ust_ctx_field *new_fields;
if (!ctx || !lttng_find_context_provider(ctx, name))
return 0;
ret = -ENOMEM;
goto field_error;
}
+ /* Copy elements */
memcpy(new_fields, ctx->fields,
sizeof(*new_fields) * ctx->allocated_fields);
for (i = 0; i < ctx->nr_fields; i++) {
- if (strncmp(new_fields[i].event_field.name,
+ if (strncmp(new_fields[i].event_field->name,
name, strlen(name)) != 0)
continue;
new_fields[i].get_size = get_size;
new_fields[i].record = record;
new_fields[i].get_value = get_value;
+ new_fields[i].priv = priv;
}
new_ctx->fields = new_fields;
lttng_ust_rcu_assign_pointer(*_ctx, new_ctx);
- lttng_ust_synchronize_trace();
+ lttng_ust_urcu_synchronize_rcu();
free(ctx->fields);
free(ctx);
return 0;
return ret;
}
-int lttng_context_init_all(struct lttng_ctx **ctx)
+int lttng_context_init_all(struct lttng_ust_ctx **ctx)
{
int ret;
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