From: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Date: Thu, 11 Feb 2021 15:18:38 +0000 (-0500)
Subject: Move event-expr from liblttng-ctl to libcommon
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=6cacd9175901ed12659d1e042343da3321b004d5;p=lttng-tools.git

Move event-expr from liblttng-ctl to libcommon

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I31c65cd7f63fa4e1c918285b02ab2ab2e82549f6
---

diff --git a/src/common/Makefile.am b/src/common/Makefile.am
index 0885448b5..ca0973403 100644
--- a/src/common/Makefile.am
+++ b/src/common/Makefile.am
@@ -66,6 +66,7 @@ libcommon_la_SOURCES = \
 	error-query.c \
 	evaluation.c \
 	event.c \
+	event-expr/event-expr.c \
 	event-expr-to-bytecode.c event-expr-to-bytecode.h \
 	event-field-value.c \
 	event-rule/event-rule.c \
diff --git a/src/common/event-expr/event-expr.c b/src/common/event-expr/event-expr.c
new file mode 100644
index 000000000..c0ec2571b
--- /dev/null
+++ b/src/common/event-expr/event-expr.c
@@ -0,0 +1,442 @@
+/*
+ * event-expr.c
+ *
+ * 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;
+	}
+
+	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:
+	if (expr) {
+		lttng_event_expr_destroy(&expr->parent);
+	}
+	expr = NULL;
+
+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;
+	struct lttng_event_expr *ret_parent_expr;
+
+	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;
+	}
+
+	ret_parent_expr = &expr->parent;
+	goto end;
+
+error:
+	if (expr) {
+		lttng_event_expr_destroy(&expr->parent);
+	}
+	ret_parent_expr = NULL;
+
+end:
+	return ret_parent_expr;
+}
+
+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;
+	struct lttng_event_expr *ret_parent_expr;
+
+	/* 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;
+	ret_parent_expr = &expr->parent;
+	goto end;
+
+error:
+	if (expr) {
+		lttng_event_expr_destroy(&expr->parent);
+	}
+	ret_parent_expr = NULL;
+
+end:
+	return ret_parent_expr;
+}
+
+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;
+}
+
+void lttng_event_expr_destroy(struct lttng_event_expr *expr)
+{
+	if (!expr) {
+		goto end;
+	}
+
+	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);
+
+end:
+	return;
+}
diff --git a/src/lib/lttng-ctl/Makefile.am b/src/lib/lttng-ctl/Makefile.am
index 28aead7ad..8c271f5ef 100644
--- a/src/lib/lttng-ctl/Makefile.am
+++ b/src/lib/lttng-ctl/Makefile.am
@@ -9,7 +9,6 @@ lib_LTLIBRARIES = liblttng-ctl.la
 liblttng_ctl_la_SOURCES = lttng-ctl.c snapshot.c lttng-ctl-helper.h \
 		lttng-ctl-health.c save.c load.c deprecated-symbols.c \
 		channel.c rotate.c event.c destruction-handle.c clear.c \
-		event-expr.c \
 		tracker.c
 
 liblttng_ctl_la_LDFLAGS = \
diff --git a/src/lib/lttng-ctl/event-expr.c b/src/lib/lttng-ctl/event-expr.c
deleted file mode 100644
index 126f0ca34..000000000
--- a/src/lib/lttng-ctl/event-expr.c
+++ /dev/null
@@ -1,444 +0,0 @@
-/*
- * 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;
-	}
-
-	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:
-	if (expr) {
-		lttng_event_expr_destroy(&expr->parent);
-	}
-	expr = NULL;
-
-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;
-	struct lttng_event_expr *ret_parent_expr;
-
-	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;
-	}
-
-	ret_parent_expr = &expr->parent;
-	goto end;
-
-error:
-	if (expr) {
-		lttng_event_expr_destroy(&expr->parent);
-	}
-	ret_parent_expr = NULL;
-
-end:
-	return ret_parent_expr;
-}
-
-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;
-	struct lttng_event_expr *ret_parent_expr;
-
-	/* 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;
-	ret_parent_expr = &expr->parent;
-	goto end;
-
-error:
-	if (expr) {
-		lttng_event_expr_destroy(&expr->parent);
-	}
-	ret_parent_expr = NULL;
-
-end:
-	return ret_parent_expr;
-}
-
-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;
-}
-
-void lttng_event_expr_destroy(struct lttng_event_expr *expr)
-{
-	if (!expr) {
-		goto end;
-	}
-
-	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);
-
-end:
-	return;
-}