X-Git-Url: http://git.liburcu.org/?p=lttng-modules.git;a=blobdiff_plain;f=lttng-filter.h;h=fec2db1f6c3b2fad866a536587bed97fd959b0dd;hp=0798354786fb6e61ef61c7a6e0d3896d559d68c3;hb=740572854b9a9a2670ef6185afc9707608559368;hpb=bbd023d66d2368bbfdfb47325963d7e0123c7a8d

diff --git a/lttng-filter.h b/lttng-filter.h
index 07983547..fec2db1f 100644
--- a/lttng-filter.h
+++ b/lttng-filter.h
@@ -1,28 +1,15 @@
-#ifndef _LTTNG_FILTER_H
-#define _LTTNG_FILTER_H
-
-/*
+/* SPDX-License-Identifier: MIT
+ *
  * lttng-filter.h
  *
  * LTTng modules filter header.
  *
- * Copyright (C) 2010-2014 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
+ * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
+#ifndef _LTTNG_FILTER_H
+#define _LTTNG_FILTER_H
+
 #include <linux/kernel.h>
 
 #include <lttng-events.h>
@@ -32,6 +19,8 @@
 #define FILTER_STACK_LEN	10	/* includes 2 dummy */
 #define FILTER_STACK_EMPTY	1
 
+#define FILTER_MAX_DATA_LEN	65536
+
 #ifdef DEBUG
 #define dbg_printk(fmt, args...)				\
 	printk(KERN_DEBUG "[debug bytecode in %s:%s@%u] " fmt,		\
@@ -49,20 +38,73 @@ do {								\
 /* Linked bytecode. Child of struct lttng_bytecode_runtime. */
 struct bytecode_runtime {
 	struct lttng_bytecode_runtime p;
+	size_t data_len;
+	size_t data_alloc_len;
+	char *data;
 	uint16_t len;
-	char data[0];
+	char code[0];
 };
 
 enum entry_type {
 	REG_S64,
 	REG_DOUBLE,
 	REG_STRING,
+	REG_STAR_GLOB_STRING,
 	REG_TYPE_UNKNOWN,
+	REG_PTR,
+};
+
+enum load_type {
+	LOAD_ROOT_CONTEXT,
+	LOAD_ROOT_APP_CONTEXT,
+	LOAD_ROOT_PAYLOAD,
+	LOAD_OBJECT,
+};
+
+enum object_type {
+	OBJECT_TYPE_S8,
+	OBJECT_TYPE_S16,
+	OBJECT_TYPE_S32,
+	OBJECT_TYPE_S64,
+	OBJECT_TYPE_U8,
+	OBJECT_TYPE_U16,
+	OBJECT_TYPE_U32,
+	OBJECT_TYPE_U64,
+
+	OBJECT_TYPE_DOUBLE,
+	OBJECT_TYPE_STRING,
+	OBJECT_TYPE_STRING_SEQUENCE,
+
+	OBJECT_TYPE_SEQUENCE,
+	OBJECT_TYPE_ARRAY,
+	OBJECT_TYPE_STRUCT,
+	OBJECT_TYPE_VARIANT,
+
+	OBJECT_TYPE_DYNAMIC,
+};
+
+struct filter_get_index_data {
+	uint64_t offset;	/* in bytes */
+	size_t ctx_index;
+	size_t array_len;
+	struct {
+		size_t len;
+		enum object_type type;
+		bool rev_bo;	/* reverse byte order */
+	} elem;
 };
 
 /* Validation stack */
+struct vstack_load {
+	enum load_type type;
+	enum object_type object_type;
+	const struct lttng_event_field *field;
+	bool rev_bo;	/* reverse byte order */
+};
+
 struct vstack_entry {
 	enum entry_type type;
+	struct vstack_load load;
 };
 
 struct vstack {
@@ -115,6 +157,30 @@ int vstack_pop(struct vstack *stack)
 }
 
 /* Execution stack */
+enum estack_string_literal_type {
+	ESTACK_STRING_LITERAL_TYPE_NONE,
+	ESTACK_STRING_LITERAL_TYPE_PLAIN,
+	ESTACK_STRING_LITERAL_TYPE_STAR_GLOB,
+};
+
+struct load_ptr {
+	enum load_type type;
+	enum object_type object_type;
+	const void *ptr;
+	bool rev_bo;
+	/* Temporary place-holders for contexts. */
+	union {
+		int64_t s64;
+		uint64_t u64;
+		double d;
+	} u;
+	/*
+	 * "field" is only needed when nested under a variant, in which
+	 * case we cannot specialize the nested operations.
+	 */
+	const struct lttng_event_field *field;
+};
+
 struct estack_entry {
 	union {
 		int64_t v;
@@ -123,9 +189,10 @@ struct estack_entry {
 			const char *str;
 			const char __user *user_str;
 			size_t seq_len;
-			int literal;		/* is string literal ? */
+			enum estack_string_literal_type literal_type;
 			int user;		/* is string from userspace ? */
 		} s;
+		struct load_ptr ptr;
 	} u;
 };
 
@@ -139,19 +206,19 @@ struct estack {
 
 #define estack_ax(stack, top)					\
 	({							\
-		WARN_ON_ONCE((top) <= FILTER_STACK_EMPTY);	\
+		BUG_ON((top) <= FILTER_STACK_EMPTY);		\
 		&(stack)->e[top];				\
 	})
 
 #define estack_bx(stack, top)					\
 	({							\
-		WARN_ON_ONCE((top) <= FILTER_STACK_EMPTY + 1);	\
+		BUG_ON((top) <= FILTER_STACK_EMPTY + 1);	\
 		&(stack)->e[(top) - 1];				\
 	})
 
 #define estack_push(stack, top, ax, bx)				\
 	do {							\
-		WARN_ON_ONCE((top) >= FILTER_STACK_LEN - 1);	\
+		BUG_ON((top) >= FILTER_STACK_LEN - 1);		\
 		(stack)->e[(top) - 1].u.v = (bx);		\
 		(bx) = (ax);					\
 		++(top);					\
@@ -159,7 +226,7 @@ struct estack {
 
 #define estack_pop(stack, top, ax, bx)				\
 	do {							\
-		WARN_ON_ONCE((top) <= FILTER_STACK_EMPTY);	\
+		BUG_ON((top) <= FILTER_STACK_EMPTY);		\
 		(ax) = (bx);					\
 		(bx) = (stack)->e[(top) - 2].u.v;		\
 		(top)--;					\
@@ -168,7 +235,8 @@ struct estack {
 const char *lttng_filter_print_op(enum filter_op op);
 
 int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode);
-int lttng_filter_specialize_bytecode(struct bytecode_runtime *bytecode);
+int lttng_filter_specialize_bytecode(struct lttng_event *event,
+		struct bytecode_runtime *bytecode);
 
 uint64_t lttng_filter_false(void *filter_data,
 		struct lttng_probe_ctx *lttng_probe_ctx,