X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fevent-expr.c;fp=src%2Fcommon%2Fevent-expr.c;h=10f109c4696faf2176d3fe4d09148fac0ab880d1;hp=0000000000000000000000000000000000000000;hb=2463b7879c00298daa79744cdaae82ac061a4ed8;hpb=3a4595c2469472dee1656cde5f8882c2123efd3c

diff --git a/src/common/event-expr.c b/src/common/event-expr.c
new file mode 100644
index 000000000..10f109c46
--- /dev/null
+++ b/src/common/event-expr.c
@@ -0,0 +1,449 @@
+/*
+ * event-expr.c
+ *
+ * Linux Trace Toolkit Control Library
+ *
+ * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <assert.h>
+#include <stddef.h>
+
+#include <common/error.h>
+#include <common/macros.h>
+#include <lttng/event-expr-internal.h>
+
+enum lttng_event_expr_type lttng_event_expr_get_type(
+		const struct lttng_event_expr *expr)
+{
+	enum lttng_event_expr_type type;
+
+	if (!expr) {
+		type = LTTNG_EVENT_EXPR_TYPE_INVALID;
+		goto end;
+	}
+
+	type = expr->type;
+
+end:
+	return type;
+}
+
+static
+struct lttng_event_expr *create_empty_expr(enum lttng_event_expr_type type,
+		size_t size)
+{
+	struct lttng_event_expr *expr;
+
+	expr = zmalloc(size);
+	if (!expr) {
+		goto end;
+	}
+
+	urcu_ref_init(&expr->ref);
+	expr->type = type;
+
+end:
+	return expr;
+}
+
+static
+struct lttng_event_expr_field *create_field_event_expr(
+		enum lttng_event_expr_type type,
+		const char *name)
+{
+	struct lttng_event_expr_field *expr =
+			container_of(
+				create_empty_expr(type, sizeof(*expr)),
+				struct lttng_event_expr_field, parent);
+
+	if (!expr) {
+		goto error;
+	}
+
+	assert(name);
+	expr->name = strdup(name);
+	if (!expr->name) {
+		goto error;
+	}
+
+	goto end;
+
+error:
+	lttng_event_expr_destroy(&expr->parent);
+
+end:
+	return expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_event_payload_field_create(
+		const char *field_name)
+{
+	struct lttng_event_expr *expr = NULL;
+
+	if (!field_name) {
+		goto end;
+	}
+
+	expr = &create_field_event_expr(
+			LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD,
+			field_name)->parent;
+
+end:
+	return expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_channel_context_field_create(
+		const char *field_name)
+{
+	struct lttng_event_expr *expr = NULL;
+
+	if (!field_name) {
+		goto end;
+	}
+
+	expr = &create_field_event_expr(
+			LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD,
+			field_name)->parent;
+
+end:
+	return expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_app_specific_context_field_create(
+		const char *provider_name, const char *type_name)
+{
+	struct lttng_event_expr_app_specific_context_field *expr = NULL;
+
+	if (!type_name || !provider_name) {
+		goto error;
+	}
+
+	expr = container_of(create_empty_expr(
+			LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD,
+			sizeof(*expr)),
+			struct lttng_event_expr_app_specific_context_field,
+			parent);
+	if (!expr) {
+		goto error;
+	}
+
+	expr->provider_name = strdup(provider_name);
+	if (!expr->provider_name) {
+		goto error;
+	}
+
+	expr->type_name = strdup(type_name);
+	if (!expr->type_name) {
+		goto error;
+	}
+
+	goto end;
+
+error:
+	lttng_event_expr_destroy(&expr->parent);
+
+end:
+	return &expr->parent;
+}
+
+struct lttng_event_expr *lttng_event_expr_array_field_element_create(
+		struct lttng_event_expr *array_field_expr,
+		unsigned int index)
+{
+	struct lttng_event_expr_array_field_element *expr = NULL;
+
+	/* The parent array field expression must be an l-value */
+	if (!array_field_expr ||
+			!lttng_event_expr_is_lvalue(array_field_expr)) {
+		goto error;
+	}
+
+	expr = container_of(create_empty_expr(
+			LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT,
+			sizeof(*expr)),
+			struct lttng_event_expr_array_field_element,
+			parent);
+	if (!expr) {
+		goto error;
+	}
+
+	expr->array_field_expr = array_field_expr;
+	expr->index = index;
+	goto end;
+
+error:
+	lttng_event_expr_destroy(&expr->parent);
+
+end:
+	return &expr->parent;
+}
+
+const char *lttng_event_expr_event_payload_field_get_name(
+		const struct lttng_event_expr *expr)
+{
+	const char *ret = NULL;
+
+	if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD) {
+		goto end;
+	}
+
+	ret = container_of(expr,
+			const struct lttng_event_expr_field, parent)->name;
+
+end:
+	return ret;
+}
+
+const char *lttng_event_expr_channel_context_field_get_name(
+		const struct lttng_event_expr *expr)
+{
+	const char *ret = NULL;
+
+	if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD) {
+		goto end;
+	}
+
+	ret = container_of(expr,
+			const struct lttng_event_expr_field, parent)->name;
+
+end:
+	return ret;
+}
+
+const char *lttng_event_expr_app_specific_context_field_get_provider_name(
+		const struct lttng_event_expr *expr)
+{
+	const char *ret = NULL;
+
+	if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) {
+		goto end;
+	}
+
+	ret = container_of(expr,
+			const struct lttng_event_expr_app_specific_context_field,
+			parent)->provider_name;
+
+end:
+	return ret;
+}
+
+const char *lttng_event_expr_app_specific_context_field_get_type_name(
+		const struct lttng_event_expr *expr)
+{
+	const char *ret = NULL;
+
+	if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) {
+		goto end;
+	}
+
+	ret = container_of(expr,
+			const struct lttng_event_expr_app_specific_context_field,
+			parent)->type_name;
+
+end:
+	return ret;
+}
+
+const struct lttng_event_expr *
+lttng_event_expr_array_field_element_get_parent_expr(
+		const struct lttng_event_expr *expr)
+{
+	const struct lttng_event_expr *ret = NULL;
+
+	if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT) {
+		goto end;
+	}
+
+	ret = container_of(expr,
+			const struct lttng_event_expr_array_field_element,
+			parent)->array_field_expr;
+
+end:
+	return ret;
+}
+
+enum lttng_event_expr_status lttng_event_expr_array_field_element_get_index(
+		const struct lttng_event_expr *expr, unsigned int *index)
+{
+	enum lttng_event_expr_status ret = LTTNG_EVENT_EXPR_STATUS_OK;
+
+	if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT ||
+			!index) {
+		ret = LTTNG_EVENT_EXPR_STATUS_INVALID;
+		goto end;
+	}
+
+	*index = container_of(expr,
+			const struct lttng_event_expr_array_field_element,
+			parent)->index;
+
+end:
+	return ret;
+}
+
+bool lttng_event_expr_is_equal(const struct lttng_event_expr *expr_a,
+		const struct lttng_event_expr *expr_b)
+{
+	bool is_equal = true;
+
+	if (!expr_a && !expr_b) {
+		/* Both `NULL`: equal */
+		goto end;
+	}
+
+	if (!expr_a || !expr_b) {
+		/* Only one `NULL`: not equal */
+		goto not_equal;
+	}
+
+	if (expr_a->type != expr_b->type) {
+		/* Different types: not equal */
+		goto not_equal;
+	}
+
+	switch (expr_a->type) {
+	case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+	case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+	{
+		const struct lttng_event_expr_field *field_expr_a =
+				container_of(expr_a,
+					const struct lttng_event_expr_field,
+					parent);
+		const struct lttng_event_expr_field *field_expr_b =
+				container_of(expr_b,
+					const struct lttng_event_expr_field,
+					parent);
+
+		if (strcmp(field_expr_a->name, field_expr_b->name) != 0) {
+			goto not_equal;
+		}
+
+		break;
+	}
+	case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+	{
+		const struct lttng_event_expr_app_specific_context_field *field_expr_a =
+				container_of(expr_a,
+					const struct lttng_event_expr_app_specific_context_field,
+					parent);
+		const struct lttng_event_expr_app_specific_context_field *field_expr_b =
+				container_of(expr_b,
+					const struct lttng_event_expr_app_specific_context_field,
+					parent);
+
+		if (strcmp(field_expr_a->provider_name,
+				field_expr_b->provider_name) != 0) {
+			goto not_equal;
+		}
+
+		if (strcmp(field_expr_a->type_name,
+				field_expr_b->type_name) != 0) {
+			goto not_equal;
+		}
+
+		break;
+	}
+	case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+	{
+		const struct lttng_event_expr_array_field_element *elem_expr_a =
+				container_of(expr_a,
+					const struct lttng_event_expr_array_field_element,
+					parent);
+		const struct lttng_event_expr_array_field_element *elem_expr_b =
+				container_of(expr_b,
+					const struct lttng_event_expr_array_field_element,
+					parent);
+
+		if (!lttng_event_expr_is_equal(elem_expr_a->array_field_expr,
+				elem_expr_b->array_field_expr)) {
+			goto not_equal;
+		}
+
+		if (elem_expr_a->index != elem_expr_b->index) {
+			goto not_equal;
+		}
+
+		break;
+	}
+	default:
+		break;
+	}
+
+	goto end;
+
+not_equal:
+	is_equal = false;
+
+end:
+	return is_equal;
+}
+
+static
+void event_expr_destroy_ref(struct urcu_ref *ref)
+{
+	struct lttng_event_expr *expr =
+		container_of(ref, struct lttng_event_expr, ref);
+
+	switch (expr->type) {
+	case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+	case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+	{
+		struct lttng_event_expr_field *field_expr =
+				container_of(expr,
+					struct lttng_event_expr_field, parent);
+
+		free(field_expr->name);
+		break;
+	}
+	case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+	{
+		struct lttng_event_expr_app_specific_context_field *field_expr =
+				container_of(expr,
+					struct lttng_event_expr_app_specific_context_field,
+					parent);
+
+		free(field_expr->provider_name);
+		free(field_expr->type_name);
+		break;
+	}
+	case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+	{
+		struct lttng_event_expr_array_field_element *elem_expr =
+				container_of(expr,
+					struct lttng_event_expr_array_field_element,
+					parent);
+
+		lttng_event_expr_destroy(elem_expr->array_field_expr);
+		break;
+	}
+	default:
+		break;
+	}
+
+	free(expr);
+}
+
+LTTNG_HIDDEN
+void lttng_event_expr_get(struct lttng_event_expr *expr)
+{
+	urcu_ref_get(&expr->ref);
+}
+
+LTTNG_HIDDEN
+void lttng_event_expr_put(struct lttng_event_expr *expr) {
+	if(!expr) {
+		return;
+	}
+	urcu_ref_put(&expr->ref, event_expr_destroy_ref);
+}
+
+void lttng_event_expr_destroy(struct lttng_event_expr *expr)
+{
+	lttng_event_expr_put(expr);
+	return;
+}