callsite: add "ip" context

[lttng-ust.git] / liblttng-ust / lttng-context-ip.c

diff --git a/liblttng-ust/lttng-context-ip.c b/liblttng-ust/lttng-context-ip.c
new file mode 100644 (file)
index 0000000..6f3edf8
--- /dev/null
+++ b/liblttng-ust/lttng-context-ip.c
@@ -0,0 +1,73 @@
+/*
+ * lttng-context-ip.c
+ *
+ * LTTng UST Instruction Pointer Context.
+ *
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <lttng/ust-events.h>
+#include <lttng/ust-tracer.h>
+#include <lttng/ringbuffer-config.h>
+
+static
+size_t ip_get_size(size_t offset)
+{
+       size_t size = 0;
+
+       size += lib_ring_buffer_align(offset, lttng_alignof(void *));
+       size += sizeof(void *);
+       return size;
+}
+
+static
+void ip_record(struct lttng_ctx_field *field,
+                struct lttng_ust_lib_ring_buffer_ctx *ctx,
+                struct lttng_channel *chan)
+{
+       void *ip;
+
+       ip = ctx->ip;
+       lib_ring_buffer_align_ctx(ctx, lttng_alignof(ip));
+       chan->ops->event_write(ctx, &ip, sizeof(ip));
+}
+
+int lttng_add_ip_to_ctx(struct lttng_ctx **ctx)
+{
+       struct lttng_ctx_field *field;
+
+       field = lttng_append_context(ctx);
+       if (!field)
+               return -ENOMEM;
+       if (lttng_find_context(*ctx, "ip")) {
+               lttng_remove_context_field(ctx, field);
+               return -EEXIST;
+       }
+       field->event_field.name = "ip";
+       field->event_field.type.atype = atype_integer;
+       field->event_field.type.u.basic.integer.size = sizeof(void *) * CHAR_BIT;
+       field->event_field.type.u.basic.integer.alignment = lttng_alignof(void *) * CHAR_BIT;
+       field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(void *);
+       field->event_field.type.u.basic.integer.reverse_byte_order = 0;
+       field->event_field.type.u.basic.integer.base = 16;
+       field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
+       field->get_size = ip_get_size;
+       field->record = ip_record;
+       return 0;
+}