*
* LTTng UST filter header.
*
- * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2010-2016 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.
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
*
- * 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.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * 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
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
*/
#include <errno.h>
#include <stdio.h>
#include <helper.h>
#include <lttng/ust-events.h>
+#include <lttng/ust-context-provider.h>
#include <stdint.h>
+#include <assert.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <usterr-signal-safe.h>
#include "filter-bytecode.h"
-#define NR_REG 2
+/* Filter stack length, in number of entries */
+#define FILTER_STACK_LEN 10 /* includes 2 dummy */
+#define FILTER_STACK_EMPTY 1
#ifndef min_t
#define min_t(type, a, b) \
#endif
#ifdef DEBUG
-#define dbg_printf(fmt, args...) printf("[debug bytecode] " fmt, ## args)
+#define dbg_printf(fmt, args...) \
+ printf("[debug bytecode in %s:%s@%u] " fmt, \
+ __FILE__, __func__, __LINE__, ## args)
#else
#define dbg_printf(fmt, args...) \
do { \
/* do nothing but check printf format */ \
if (0) \
- printf("[debug bytecode] " fmt, ## args); \
+ printf("[debug bytecode in %s:%s@%u] " fmt, \
+ __FILE__, __func__, __LINE__, ## args); \
} while (0)
#endif
-/* Linked bytecode */
+/* Linked bytecode. Child of struct lttng_bytecode_runtime. */
struct bytecode_runtime {
+ struct lttng_bytecode_runtime p;
uint16_t len;
char data[0];
};
-enum reg_type {
+enum entry_type {
REG_S64,
REG_DOUBLE,
REG_STRING,
- REG_TYPE_UNKNOWN,
+ REG_STAR_GLOB_STRING,
+ REG_UNKNOWN,
+};
+
+/* Validation stack */
+struct vstack_entry {
+ enum entry_type type;
+};
+
+struct vstack {
+ int top; /* top of stack */
+ struct vstack_entry e[FILTER_STACK_LEN];
};
-/* Validation registers */
-struct vreg {
- enum reg_type type;
- int literal; /* is string literal ? */
+static inline
+void vstack_init(struct vstack *stack)
+{
+ stack->top = -1;
+}
+
+static inline
+struct vstack_entry *vstack_ax(struct vstack *stack)
+{
+ if (unlikely(stack->top < 0))
+ return NULL;
+ return &stack->e[stack->top];
+}
+
+static inline
+struct vstack_entry *vstack_bx(struct vstack *stack)
+{
+ if (unlikely(stack->top < 1))
+ return NULL;
+ return &stack->e[stack->top - 1];
+}
+
+static inline
+int vstack_push(struct vstack *stack)
+{
+ if (stack->top >= FILTER_STACK_LEN - 1) {
+ ERR("Stack full\n");
+ return -EINVAL;
+ }
+ ++stack->top;
+ return 0;
+}
+
+static inline
+int vstack_pop(struct vstack *stack)
+{
+ if (unlikely(stack->top < 0)) {
+ ERR("Stack empty\n");
+ return -EINVAL;
+ }
+ stack->top--;
+ return 0;
+}
+
+/* Execution stack */
+enum estack_string_literal_type {
+ ESTACK_STRING_LITERAL_TYPE_NONE,
+ ESTACK_STRING_LITERAL_TYPE_PLAIN,
+ ESTACK_STRING_LITERAL_TYPE_STAR_GLOB,
};
-/* Execution registers */
-struct reg {
- enum reg_type type;
- int64_t v;
- double d;
+struct estack_entry {
+ enum entry_type type; /* For dynamic typing. */
+ union {
+ int64_t v;
+ double d;
+
+ struct {
+ const char *str;
+ size_t seq_len;
+ enum estack_string_literal_type literal_type;
+ } s;
+ } u;
+};
- const char *str;
- size_t seq_len;
- int literal; /* is string literal ? */
+struct estack {
+ int top; /* top of stack */
+ struct estack_entry e[FILTER_STACK_LEN];
};
+/*
+ * Always use aliased type for ax/bx (top of stack).
+ * When ax/bx are S64, use aliased value.
+ */
+#define estack_ax_v ax
+#define estack_bx_v bx
+#define estack_ax_t ax_t
+#define estack_bx_t bx_t
+
+/*
+ * ax and bx registers can hold either integer, double or string.
+ */
+#define estack_ax(stack, top) \
+ ({ \
+ assert((top) > FILTER_STACK_EMPTY); \
+ &(stack)->e[top]; \
+ })
+
+#define estack_bx(stack, top) \
+ ({ \
+ assert((top) > FILTER_STACK_EMPTY + 1); \
+ &(stack)->e[(top) - 1]; \
+ })
+
+/*
+ * Currently, only integers (REG_S64) can be pushed into the stack.
+ */
+#define estack_push(stack, top, ax, bx, ax_t, bx_t) \
+ do { \
+ assert((top) < FILTER_STACK_LEN - 1); \
+ (stack)->e[(top) - 1].u.v = (bx); \
+ (stack)->e[(top) - 1].type = (bx_t); \
+ (bx) = (ax); \
+ (bx_t) = (ax_t); \
+ ++(top); \
+ } while (0)
+
+#define estack_pop(stack, top, ax, bx, ax_t, bx_t) \
+ do { \
+ assert((top) > FILTER_STACK_EMPTY); \
+ (ax) = (bx); \
+ (ax_t) = (bx_t); \
+ (bx) = (stack)->e[(top) - 2].u.v; \
+ (bx_t) = (stack)->e[(top) - 2].type; \
+ (top)--; \
+ } while (0)
+
const char *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_false(void *filter_data,
+uint64_t lttng_filter_false(void *filter_data,
const char *filter_stack_data);
-int lttng_filter_interpret_bytecode(void *filter_data,
+uint64_t lttng_filter_interpret_bytecode(void *filter_data,
const char *filter_stack_data);
#endif /* _LTTNG_FILTER_H */
projects / lttng-ust.git / blobdiff