+++ /dev/null
-/*
- * lttng-filter.c
- *
- * LTTng UST filter code.
- *
- * Copyright (C) 2010-2012 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 <errno.h>
-#include <stdio.h>
-#include <helper.h>
-#include <lttng/ust-events.h>
-#include <stdint.h>
-#include <errno.h>
-#include <string.h>
-#include <inttypes.h>
-#include <limits.h>
-#include <usterr-signal-safe.h>
-#include "filter-bytecode.h"
-
-#define NR_REG 2
-
-#ifndef min_t
-#define min_t(type, a, b) \
- ((type) (a) < (type) (b) ? (type) (a) : (type) (b))
-#endif
-
-#ifndef likely
-#define likely(x) __builtin_expect(!!(x), 1)
-#endif
-
-#ifndef unlikely
-#define unlikely(x) __builtin_expect(!!(x), 0)
-#endif
-
-#ifdef DEBUG
-#define dbg_printf(fmt, args...) printf("[debug bytecode] " fmt, ## args)
-#else
-#define dbg_printf(fmt, args...) \
-do { \
- /* do nothing but check printf format */ \
- if (0) \
- printf("[debug bytecode] " fmt, ## args); \
-} while (0)
-#endif
-
-/* Linked bytecode */
-struct bytecode_runtime {
- uint16_t len;
- char data[0];
-};
-
-enum reg_type {
- REG_S64,
- REG_DOUBLE,
- REG_STRING,
- REG_TYPE_UNKNOWN,
-};
-
-/* Validation registers */
-struct vreg {
- enum reg_type type;
- int literal; /* is string literal ? */
-};
-
-/* Execution registers */
-struct reg {
- enum reg_type type;
- int64_t v;
- double d;
-
- const char *str;
- size_t seq_len;
- int literal; /* is string literal ? */
-};
-
-static const char *opnames[] = {
- [ FILTER_OP_UNKNOWN ] = "UNKNOWN",
-
- [ FILTER_OP_RETURN ] = "RETURN",
-
- /* binary */
- [ FILTER_OP_MUL ] = "MUL",
- [ FILTER_OP_DIV ] = "DIV",
- [ FILTER_OP_MOD ] = "MOD",
- [ FILTER_OP_PLUS ] = "PLUS",
- [ FILTER_OP_MINUS ] = "MINUS",
- [ FILTER_OP_RSHIFT ] = "RSHIFT",
- [ FILTER_OP_LSHIFT ] = "LSHIFT",
- [ FILTER_OP_BIN_AND ] = "BIN_AND",
- [ FILTER_OP_BIN_OR ] = "BIN_OR",
- [ FILTER_OP_BIN_XOR ] = "BIN_XOR",
-
- /* binary comparators */
- [ FILTER_OP_EQ ] = "EQ",
- [ FILTER_OP_NE ] = "NE",
- [ FILTER_OP_GT ] = "GT",
- [ FILTER_OP_LT ] = "LT",
- [ FILTER_OP_GE ] = "GE",
- [ FILTER_OP_LE ] = "LE",
-
- /* string binary comparators */
- [ FILTER_OP_EQ_STRING ] = "EQ_STRING",
- [ FILTER_OP_NE_STRING ] = "NE_STRING",
- [ FILTER_OP_GT_STRING ] = "GT_STRING",
- [ FILTER_OP_LT_STRING ] = "LT_STRING",
- [ FILTER_OP_GE_STRING ] = "GE_STRING",
- [ FILTER_OP_LE_STRING ] = "LE_STRING",
-
- /* s64 binary comparators */
- [ FILTER_OP_EQ_S64 ] = "EQ_S64",
- [ FILTER_OP_NE_S64 ] = "NE_S64",
- [ FILTER_OP_GT_S64 ] = "GT_S64",
- [ FILTER_OP_LT_S64 ] = "LT_S64",
- [ FILTER_OP_GE_S64 ] = "GE_S64",
- [ FILTER_OP_LE_S64 ] = "LE_S64",
-
- /* double binary comparators */
- [ FILTER_OP_EQ_DOUBLE ] = "EQ_DOUBLE",
- [ FILTER_OP_NE_DOUBLE ] = "NE_DOUBLE",
- [ FILTER_OP_GT_DOUBLE ] = "GT_DOUBLE",
- [ FILTER_OP_LT_DOUBLE ] = "LT_DOUBLE",
- [ FILTER_OP_GE_DOUBLE ] = "GE_DOUBLE",
- [ FILTER_OP_LE_DOUBLE ] = "LE_DOUBLE",
-
-
- /* unary */
- [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
- [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
- [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
- [ FILTER_OP_UNARY_PLUS_S64 ] = "UNARY_PLUS_S64",
- [ FILTER_OP_UNARY_MINUS_S64 ] = "UNARY_MINUS_S64",
- [ FILTER_OP_UNARY_NOT_S64 ] = "UNARY_NOT_S64",
- [ FILTER_OP_UNARY_PLUS_DOUBLE ] = "UNARY_PLUS_DOUBLE",
- [ FILTER_OP_UNARY_MINUS_DOUBLE ] = "UNARY_MINUS_DOUBLE",
- [ FILTER_OP_UNARY_NOT_DOUBLE ] = "UNARY_NOT_DOUBLE",
-
- /* logical */
- [ FILTER_OP_AND ] = "AND",
- [ FILTER_OP_OR ] = "OR",
-
- /* load */
- [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
- [ FILTER_OP_LOAD_FIELD_REF_STRING ] = "LOAD_FIELD_REF_STRING",
- [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = "LOAD_FIELD_REF_SEQUENCE",
- [ FILTER_OP_LOAD_FIELD_REF_S64 ] = "LOAD_FIELD_REF_S64",
- [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = "LOAD_FIELD_REF_DOUBLE",
-
- [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
- [ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
- [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE",
-
- /* cast */
- [ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64",
- [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64",
- [ FILTER_OP_CAST_NOP ] = "CAST_NOP",
-};
-
-static
-const char *print_op(enum filter_op op)
-{
- if (op >= NR_FILTER_OPS)
- return "UNKNOWN";
- else
- return opnames[op];
-}
-
-/*
- * -1: wildcard found.
- * -2: unknown escape char.
- * 0: normal char.
- */
-
-static
-int parse_char(const char **p)
-{
- switch (**p) {
- case '\\':
- (*p)++;
- switch (**p) {
- case '\\':
- case '*':
- return 0;
- default:
- return -2;
- }
- case '*':
- return -1;
- default:
- return 0;
- }
-}
-
-static
-int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type)
-{
- const char *p = reg[REG_R0].str, *q = reg[REG_R1].str;
- int ret;
- int diff;
-
- for (;;) {
- int escaped_r0 = 0;
-
- if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) {
- if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')
- diff = 0;
- else
- diff = -1;
- break;
- }
- if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) {
- if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')
- diff = 0;
- else
- diff = 1;
- break;
- }
- if (reg[REG_R0].literal) {
- ret = parse_char(&p);
- if (ret == -1) {
- return 0;
- } else if (ret == -2) {
- escaped_r0 = 1;
- }
- /* else compare both char */
- }
- if (reg[REG_R1].literal) {
- ret = parse_char(&q);
- if (ret == -1) {
- return 0;
- } else if (ret == -2) {
- if (!escaped_r0)
- return -1;
- } else {
- if (escaped_r0)
- return 1;
- }
- } else {
- if (escaped_r0)
- return 1;
- }
- diff = *p - *q;
- if (diff != 0)
- break;
- p++;
- q++;
- }
- return diff;
-}
-
-static
-int lttng_filter_false(void *filter_data,
- const char *filter_stack_data)
-{
- return 0;
-}
-
-#ifdef INTERPRETER_USE_SWITCH
-
-/*
- * Fallback for compilers that do not support taking address of labels.
- */
-
-#define START_OP \
- start_pc = &bytecode->data[0]; \
- for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; \
- pc = next_pc) { \
- dbg_printf("Executing op %s (%u)\n", \
- print_op((unsigned int) *(filter_opcode_t *) pc), \
- (unsigned int) *(filter_opcode_t *) pc); \
- switch (*(filter_opcode_t *) pc) {
-
-#define OP(name) case name
-
-#define PO break
-
-#define END_OP } \
- }
-
-#else
-
-/*
- * Dispatch-table based interpreter.
- */
-
-#define START_OP \
- start_pc = &bytecode->data[0]; \
- pc = next_pc = start_pc; \
- if (unlikely(pc - start_pc >= bytecode->len)) \
- goto end; \
- goto *dispatch[*(filter_opcode_t *) pc];
-
-#define OP(name) \
-LABEL_##name
-
-#define PO \
- pc = next_pc; \
- goto *dispatch[*(filter_opcode_t *) pc];
-
-#define END_OP
-
-#endif
-
-static
-int lttng_filter_interpret_bytecode(void *filter_data,
- const char *filter_stack_data)
-{
- struct bytecode_runtime *bytecode = filter_data;
- void *pc, *next_pc, *start_pc;
- int ret = -EINVAL;
- int retval = 0;
- struct reg reg[NR_REG];
-#ifndef INTERPRETER_USE_SWITCH
- static void *dispatch[NR_FILTER_OPS] = {
- [ FILTER_OP_UNKNOWN ] = &&LABEL_FILTER_OP_UNKNOWN,
-
- [ FILTER_OP_RETURN ] = &&LABEL_FILTER_OP_RETURN,
-
- /* binary */
- [ FILTER_OP_MUL ] = &&LABEL_FILTER_OP_MUL,
- [ FILTER_OP_DIV ] = &&LABEL_FILTER_OP_DIV,
- [ FILTER_OP_MOD ] = &&LABEL_FILTER_OP_MOD,
- [ FILTER_OP_PLUS ] = &&LABEL_FILTER_OP_PLUS,
- [ FILTER_OP_MINUS ] = &&LABEL_FILTER_OP_MINUS,
- [ FILTER_OP_RSHIFT ] = &&LABEL_FILTER_OP_RSHIFT,
- [ FILTER_OP_LSHIFT ] = &&LABEL_FILTER_OP_LSHIFT,
- [ FILTER_OP_BIN_AND ] = &&LABEL_FILTER_OP_BIN_AND,
- [ FILTER_OP_BIN_OR ] = &&LABEL_FILTER_OP_BIN_OR,
- [ FILTER_OP_BIN_XOR ] = &&LABEL_FILTER_OP_BIN_XOR,
-
- /* binary comparators */
- [ FILTER_OP_EQ ] = &&LABEL_FILTER_OP_EQ,
- [ FILTER_OP_NE ] = &&LABEL_FILTER_OP_NE,
- [ FILTER_OP_GT ] = &&LABEL_FILTER_OP_GT,
- [ FILTER_OP_LT ] = &&LABEL_FILTER_OP_LT,
- [ FILTER_OP_GE ] = &&LABEL_FILTER_OP_GE,
- [ FILTER_OP_LE ] = &&LABEL_FILTER_OP_LE,
-
- /* string binary comparator */
- [ FILTER_OP_EQ_STRING ] = &&LABEL_FILTER_OP_EQ_STRING,
- [ FILTER_OP_NE_STRING ] = &&LABEL_FILTER_OP_NE_STRING,
- [ FILTER_OP_GT_STRING ] = &&LABEL_FILTER_OP_GT_STRING,
- [ FILTER_OP_LT_STRING ] = &&LABEL_FILTER_OP_LT_STRING,
- [ FILTER_OP_GE_STRING ] = &&LABEL_FILTER_OP_GE_STRING,
- [ FILTER_OP_LE_STRING ] = &&LABEL_FILTER_OP_LE_STRING,
-
- /* s64 binary comparator */
- [ FILTER_OP_EQ_S64 ] = &&LABEL_FILTER_OP_EQ_S64,
- [ FILTER_OP_NE_S64 ] = &&LABEL_FILTER_OP_NE_S64,
- [ FILTER_OP_GT_S64 ] = &&LABEL_FILTER_OP_GT_S64,
- [ FILTER_OP_LT_S64 ] = &&LABEL_FILTER_OP_LT_S64,
- [ FILTER_OP_GE_S64 ] = &&LABEL_FILTER_OP_GE_S64,
- [ FILTER_OP_LE_S64 ] = &&LABEL_FILTER_OP_LE_S64,
-
- /* double binary comparator */
- [ FILTER_OP_EQ_DOUBLE ] = &&LABEL_FILTER_OP_EQ_DOUBLE,
- [ FILTER_OP_NE_DOUBLE ] = &&LABEL_FILTER_OP_NE_DOUBLE,
- [ FILTER_OP_GT_DOUBLE ] = &&LABEL_FILTER_OP_GT_DOUBLE,
- [ FILTER_OP_LT_DOUBLE ] = &&LABEL_FILTER_OP_LT_DOUBLE,
- [ FILTER_OP_GE_DOUBLE ] = &&LABEL_FILTER_OP_GE_DOUBLE,
- [ FILTER_OP_LE_DOUBLE ] = &&LABEL_FILTER_OP_LE_DOUBLE,
-
- /* unary */
- [ FILTER_OP_UNARY_PLUS ] = &&LABEL_FILTER_OP_UNARY_PLUS,
- [ FILTER_OP_UNARY_MINUS ] = &&LABEL_FILTER_OP_UNARY_MINUS,
- [ FILTER_OP_UNARY_NOT ] = &&LABEL_FILTER_OP_UNARY_NOT,
- [ FILTER_OP_UNARY_PLUS_S64 ] = &&LABEL_FILTER_OP_UNARY_PLUS_S64,
- [ FILTER_OP_UNARY_MINUS_S64 ] = &&LABEL_FILTER_OP_UNARY_MINUS_S64,
- [ FILTER_OP_UNARY_NOT_S64 ] = &&LABEL_FILTER_OP_UNARY_NOT_S64,
- [ FILTER_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_PLUS_DOUBLE,
- [ FILTER_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_MINUS_DOUBLE,
- [ FILTER_OP_UNARY_NOT_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_NOT_DOUBLE,
-
- /* logical */
- [ FILTER_OP_AND ] = &&LABEL_FILTER_OP_AND,
- [ FILTER_OP_OR ] = &&LABEL_FILTER_OP_OR,
-
- /* load */
- [ FILTER_OP_LOAD_FIELD_REF ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF,
- [ FILTER_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_STRING,
- [ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_SEQUENCE,
- [ FILTER_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_S64,
- [ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_DOUBLE,
-
- [ FILTER_OP_LOAD_STRING ] = &&LABEL_FILTER_OP_LOAD_STRING,
- [ FILTER_OP_LOAD_S64 ] = &&LABEL_FILTER_OP_LOAD_S64,
- [ FILTER_OP_LOAD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_DOUBLE,
-
- /* cast */
- [ FILTER_OP_CAST_TO_S64 ] = &&LABEL_FILTER_OP_CAST_TO_S64,
- [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_FILTER_OP_CAST_DOUBLE_TO_S64,
- [ FILTER_OP_CAST_NOP ] = &&LABEL_FILTER_OP_CAST_NOP,
- };
-#endif /* #ifndef INTERPRETER_USE_SWITCH */
-
- START_OP
-
- OP(FILTER_OP_UNKNOWN):
- OP(FILTER_OP_LOAD_FIELD_REF):
-#ifdef INTERPRETER_USE_SWITCH
- default:
-#endif /* INTERPRETER_USE_SWITCH */
- ERR("unknown bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_RETURN):
- retval = !!reg[0].v;
- ret = 0;
- goto end;
-
- /* binary */
- OP(FILTER_OP_MUL):
- OP(FILTER_OP_DIV):
- OP(FILTER_OP_MOD):
- OP(FILTER_OP_PLUS):
- OP(FILTER_OP_MINUS):
- OP(FILTER_OP_RSHIFT):
- OP(FILTER_OP_LSHIFT):
- OP(FILTER_OP_BIN_AND):
- OP(FILTER_OP_BIN_OR):
- OP(FILTER_OP_BIN_XOR):
- ERR("unsupported bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_EQ):
- OP(FILTER_OP_NE):
- OP(FILTER_OP_GT):
- OP(FILTER_OP_LT):
- OP(FILTER_OP_GE):
- OP(FILTER_OP_LE):
- ERR("unsupported non-specialized bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_EQ_STRING):
- {
- reg[REG_R0].v = (reg_strcmp(reg, "==") == 0);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_NE_STRING):
- {
- reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GT_STRING):
- {
- reg[REG_R0].v = (reg_strcmp(reg, ">") > 0);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LT_STRING):
- {
- reg[REG_R0].v = (reg_strcmp(reg, "<") < 0);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GE_STRING):
- {
- reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LE_STRING):
- {
- reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
-
- OP(FILTER_OP_EQ_S64):
- {
- reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_NE_S64):
- {
- reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GT_S64):
- {
- reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LT_S64):
- {
- reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GE_S64):
- {
- reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LE_S64):
- {
- reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
-
- OP(FILTER_OP_EQ_DOUBLE):
- {
- if (unlikely(reg[REG_R0].type == REG_S64))
- reg[REG_R0].d = (double) reg[REG_R0].v;
- else if (unlikely(reg[REG_R1].type == REG_S64))
- reg[REG_R1].d = (double) reg[REG_R1].v;
- reg[REG_R0].v = (reg[REG_R0].d == reg[REG_R1].d);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_NE_DOUBLE):
- {
- if (unlikely(reg[REG_R0].type == REG_S64))
- reg[REG_R0].d = (double) reg[REG_R0].v;
- else if (unlikely(reg[REG_R1].type == REG_S64))
- reg[REG_R1].d = (double) reg[REG_R1].v;
- reg[REG_R0].v = (reg[REG_R0].d != reg[REG_R1].d);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GT_DOUBLE):
- {
- if (unlikely(reg[REG_R0].type == REG_S64))
- reg[REG_R0].d = (double) reg[REG_R0].v;
- else if (unlikely(reg[REG_R1].type == REG_S64))
- reg[REG_R1].d = (double) reg[REG_R1].v;
- reg[REG_R0].v = (reg[REG_R0].d > reg[REG_R1].d);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LT_DOUBLE):
- {
- if (unlikely(reg[REG_R0].type == REG_S64))
- reg[REG_R0].d = (double) reg[REG_R0].v;
- else if (unlikely(reg[REG_R1].type == REG_S64))
- reg[REG_R1].d = (double) reg[REG_R1].v;
- reg[REG_R0].v = (reg[REG_R0].d < reg[REG_R1].d);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_GE_DOUBLE):
- {
- if (unlikely(reg[REG_R0].type == REG_S64))
- reg[REG_R0].d = (double) reg[REG_R0].v;
- else if (unlikely(reg[REG_R1].type == REG_S64))
- reg[REG_R1].d = (double) reg[REG_R1].v;
- reg[REG_R0].v = (reg[REG_R0].d >= reg[REG_R1].d);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
- OP(FILTER_OP_LE_DOUBLE):
- {
- if (unlikely(reg[REG_R0].type == REG_S64))
- reg[REG_R0].d = (double) reg[REG_R0].v;
- else if (unlikely(reg[REG_R1].type == REG_S64))
- reg[REG_R1].d = (double) reg[REG_R1].v;
- reg[REG_R0].v = (reg[REG_R0].d <= reg[REG_R1].d);
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- PO;
- }
-
- /* unary */
- OP(FILTER_OP_UNARY_PLUS):
- OP(FILTER_OP_UNARY_MINUS):
- OP(FILTER_OP_UNARY_NOT):
- ERR("unsupported non-specialized bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
-
- OP(FILTER_OP_UNARY_PLUS_S64):
- OP(FILTER_OP_UNARY_PLUS_DOUBLE):
- {
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_MINUS_S64):
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- reg[insn->reg].v = -reg[insn->reg].v;
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_MINUS_DOUBLE):
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- reg[insn->reg].d = -reg[insn->reg].d;
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_NOT_S64):
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- reg[insn->reg].v = !reg[insn->reg].v;
- next_pc += sizeof(struct unary_op);
- PO;
- }
- OP(FILTER_OP_UNARY_NOT_DOUBLE):
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- reg[insn->reg].d = !reg[insn->reg].d;
- next_pc += sizeof(struct unary_op);
- PO;
- }
-
- /* logical */
- OP(FILTER_OP_AND):
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- /* If REG_R0 is 0, skip and evaluate to 0 */
- if (unlikely(reg[REG_R0].v == 0)) {
- dbg_printf("Jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- next_pc = start_pc + insn->skip_offset;
- } else {
- next_pc += sizeof(struct logical_op);
- }
- PO;
- }
- OP(FILTER_OP_OR):
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- /* If REG_R0 is nonzero, skip and evaluate to 1 */
-
- if (unlikely(reg[REG_R0].v != 0)) {
- reg[REG_R0].v = 1;
- dbg_printf("Jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- next_pc = start_pc + insn->skip_offset;
- } else {
- next_pc += sizeof(struct logical_op);
- }
- PO;
- }
-
-
- /* load */
- OP(FILTER_OP_LOAD_FIELD_REF_STRING):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printf("load field ref offset %u type string\n",
- ref->offset);
- reg[insn->reg].str =
- *(const char * const *) &filter_stack_data[ref->offset];
- if (unlikely(!reg[insn->reg].str)) {
- dbg_printf("Filter warning: loading a NULL string.\n");
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].seq_len = UINT_MAX;
- reg[insn->reg].literal = 0;
- dbg_printf("ref load string %s\n", reg[insn->reg].str);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_SEQUENCE):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printf("load field ref offset %u type sequence\n",
- ref->offset);
- reg[insn->reg].seq_len =
- *(unsigned long *) &filter_stack_data[ref->offset];
- reg[insn->reg].str =
- *(const char **) (&filter_stack_data[ref->offset
- + sizeof(unsigned long)]);
- if (unlikely(!reg[insn->reg].str)) {
- dbg_printf("Filter warning: loading a NULL sequence.\n");
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_S64):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printf("load field ref offset %u type s64\n",
- ref->offset);
- memcpy(®[insn->reg].v, &filter_stack_data[ref->offset],
- sizeof(struct literal_numeric));
- reg[insn->reg].type = REG_S64;
- dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_FIELD_REF_DOUBLE):
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- dbg_printf("load field ref offset %u type double\n",
- ref->offset);
- memcpy(®[insn->reg].d, &filter_stack_data[ref->offset],
- sizeof(struct literal_double));
- reg[insn->reg].type = REG_DOUBLE;
- dbg_printf("ref load double %g\n", reg[insn->reg].d);
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- PO;
- }
-
- OP(FILTER_OP_LOAD_STRING):
- {
- struct load_op *insn = (struct load_op *) pc;
-
- dbg_printf("load string %s\n", insn->data);
- reg[insn->reg].str = insn->data;
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].seq_len = UINT_MAX;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
- PO;
- }
-
- OP(FILTER_OP_LOAD_S64):
- {
- struct load_op *insn = (struct load_op *) pc;
-
- memcpy(®[insn->reg].v, insn->data,
- sizeof(struct literal_numeric));
- dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v);
- reg[insn->reg].type = REG_S64;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_numeric);
- PO;
- }
-
- OP(FILTER_OP_LOAD_DOUBLE):
- {
- struct load_op *insn = (struct load_op *) pc;
-
- memcpy(®[insn->reg].d, insn->data,
- sizeof(struct literal_double));
- dbg_printf("load s64 %g\n", reg[insn->reg].d);
- reg[insn->reg].type = REG_DOUBLE;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_double);
- PO;
- }
-
- /* cast */
- OP(FILTER_OP_CAST_TO_S64):
- ERR("unsupported non-specialized bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- OP(FILTER_OP_CAST_DOUBLE_TO_S64):
- {
- struct cast_op *insn = (struct cast_op *) pc;
-
- reg[insn->reg].v = (int64_t) reg[insn->reg].d;
- reg[insn->reg].type = REG_S64;
- next_pc += sizeof(struct cast_op);
- PO;
- }
-
- OP(FILTER_OP_CAST_NOP):
- {
- next_pc += sizeof(struct cast_op);
- PO;
- }
-
- END_OP
-end:
- /* return 0 (discard) on error */
- if (ret)
- return 0;
- return retval;
-}
-
-#undef START_OP
-#undef OP
-#undef PO
-#undef END_OP
-
-static
-int bin_op_compare_check(struct vreg reg[NR_REG], const char *str)
-{
- switch (reg[REG_R0].type) {
- default:
- goto error_unknown;
-
- case REG_STRING:
- switch (reg[REG_R1].type) {
- default:
- goto error_unknown;
-
- case REG_STRING:
- break;
- case REG_S64:
- case REG_DOUBLE:
- goto error_mismatch;
- }
- break;
- case REG_S64:
- case REG_DOUBLE:
- switch (reg[REG_R1].type) {
- default:
- goto error_unknown;
-
- case REG_STRING:
- goto error_mismatch;
-
- case REG_S64:
- case REG_DOUBLE:
- break;
- }
- break;
- }
- return 0;
-
-error_unknown:
-
- return -EINVAL;
-error_mismatch:
- ERR("type mismatch for '%s' binary operator\n", str);
- return -EINVAL;
-}
-
-static
-int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode)
-{
- void *pc, *next_pc, *start_pc;
- int ret = -EINVAL;
- struct vreg reg[NR_REG];
- int i;
-
- for (i = 0; i < NR_REG; i++) {
- reg[i].type = REG_TYPE_UNKNOWN;
- reg[i].literal = 0;
- }
-
- start_pc = &bytecode->data[0];
- for (pc = next_pc = start_pc; pc - start_pc < bytecode->len;
- pc = next_pc) {
- if (unlikely(pc >= start_pc + bytecode->len)) {
- ERR("filter bytecode overflow\n");
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("Validating op %s (%u)\n",
- print_op((unsigned int) *(filter_opcode_t *) pc),
- (unsigned int) *(filter_opcode_t *) pc);
- switch (*(filter_opcode_t *) pc) {
- case FILTER_OP_UNKNOWN:
- default:
- ERR("unknown bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- case FILTER_OP_RETURN:
- ret = 0;
- goto end;
-
- /* binary */
- case FILTER_OP_MUL:
- case FILTER_OP_DIV:
- case FILTER_OP_MOD:
- case FILTER_OP_PLUS:
- case FILTER_OP_MINUS:
- case FILTER_OP_RSHIFT:
- case FILTER_OP_LSHIFT:
- case FILTER_OP_BIN_AND:
- case FILTER_OP_BIN_OR:
- case FILTER_OP_BIN_XOR:
- ERR("unsupported bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- case FILTER_OP_EQ:
- {
- ret = bin_op_compare_check(reg, "==");
- if (ret)
- goto end;
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_NE:
- {
- ret = bin_op_compare_check(reg, "!=");
- if (ret)
- goto end;
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_GT:
- {
- ret = bin_op_compare_check(reg, ">");
- if (ret)
- goto end;
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_LT:
- {
- ret = bin_op_compare_check(reg, "<");
- if (ret)
- goto end;
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_GE:
- {
- ret = bin_op_compare_check(reg, ">=");
- if (ret)
- goto end;
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_LE:
- {
- ret = bin_op_compare_check(reg, "<=");
- if (ret)
- goto end;
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_EQ_STRING:
- case FILTER_OP_NE_STRING:
- case FILTER_OP_GT_STRING:
- case FILTER_OP_LT_STRING:
- case FILTER_OP_GE_STRING:
- case FILTER_OP_LE_STRING:
- {
- if (reg[REG_R0].type != REG_STRING
- || reg[REG_R1].type != REG_STRING) {
- ERR("Unexpected register type for string comparator\n");
- ret = -EINVAL;
- goto end;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_EQ_S64:
- case FILTER_OP_NE_S64:
- case FILTER_OP_GT_S64:
- case FILTER_OP_LT_S64:
- case FILTER_OP_GE_S64:
- case FILTER_OP_LE_S64:
- {
- if (reg[REG_R0].type != REG_S64
- || reg[REG_R1].type != REG_S64) {
- ERR("Unexpected register type for s64 comparator\n");
- ret = -EINVAL;
- goto end;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_EQ_DOUBLE:
- case FILTER_OP_NE_DOUBLE:
- case FILTER_OP_GT_DOUBLE:
- case FILTER_OP_LT_DOUBLE:
- case FILTER_OP_GE_DOUBLE:
- case FILTER_OP_LE_DOUBLE:
- {
- if ((reg[REG_R0].type != REG_DOUBLE && reg[REG_R0].type != REG_S64)
- || (reg[REG_R1].type != REG_DOUBLE && reg[REG_R1].type != REG_S64)) {
- ERR("Unexpected register type for double comparator\n");
- ret = -EINVAL;
- goto end;
- }
- if (reg[REG_R0].type != REG_DOUBLE && reg[REG_R1].type != REG_DOUBLE) {
- ERR("Double operator should have at least one double register\n");
- ret = -EINVAL;
- goto end;
- }
- reg[REG_R0].type = REG_DOUBLE;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- /* unary */
- case FILTER_OP_UNARY_PLUS:
- case FILTER_OP_UNARY_MINUS:
- case FILTER_OP_UNARY_NOT:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- switch (reg[insn->reg].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- ERR("Unary op can only be applied to numeric or floating point registers\n");
- ret = -EINVAL;
- goto end;
- case REG_S64:
- break;
- case REG_DOUBLE:
- break;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_PLUS_S64:
- case FILTER_OP_UNARY_MINUS_S64:
- case FILTER_OP_UNARY_NOT_S64:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- if (reg[insn->reg].type != REG_S64) {
- ERR("Invalid register type\n");
- ret = -EINVAL;
- goto end;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_PLUS_DOUBLE:
- case FILTER_OP_UNARY_MINUS_DOUBLE:
- case FILTER_OP_UNARY_NOT_DOUBLE:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- if (reg[insn->reg].type != REG_DOUBLE) {
- ERR("Invalid register type\n");
- ret = -EINVAL;
- goto end;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- /* logical */
- case FILTER_OP_AND:
- case FILTER_OP_OR:
- {
- struct logical_op *insn = (struct logical_op *) pc;
-
- if (reg[REG_R0].type != REG_S64) {
- ERR("Logical comparator expects S64 register\n");
- ret = -EINVAL;
- goto end;
- }
-
- dbg_printf("Validate jumping to bytecode offset %u\n",
- (unsigned int) insn->skip_offset);
- if (unlikely(start_pc + insn->skip_offset <= pc)) {
- ERR("Loops are not allowed in bytecode\n");
- ret = -EINVAL;
- goto end;
- }
- next_pc += sizeof(struct logical_op);
- break;
- }
-
- /* load */
- case FILTER_OP_LOAD_FIELD_REF:
- {
- ERR("Unknown field ref type\n");
- ret = -EINVAL;
- goto end;
- }
- case FILTER_OP_LOAD_FIELD_REF_STRING:
- case FILTER_OP_LOAD_FIELD_REF_SEQUENCE:
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("Validate load field ref offset %u type string\n",
- ref->offset);
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_S64:
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("Validate load field ref offset %u type s64\n",
- ref->offset);
- reg[insn->reg].type = REG_S64;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_DOUBLE:
- {
- struct load_op *insn = (struct load_op *) pc;
- struct field_ref *ref = (struct field_ref *) insn->data;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- dbg_printf("Validate load field ref offset %u type double\n",
- ref->offset);
- reg[insn->reg].type = REG_DOUBLE;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
-
- case FILTER_OP_LOAD_STRING:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
- break;
- }
-
- case FILTER_OP_LOAD_S64:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].type = REG_S64;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_numeric);
- break;
- }
-
- case FILTER_OP_LOAD_DOUBLE:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- reg[insn->reg].type = REG_DOUBLE;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_double);
- break;
- }
-
- case FILTER_OP_CAST_TO_S64:
- case FILTER_OP_CAST_DOUBLE_TO_S64:
- {
- struct cast_op *insn = (struct cast_op *) pc;
-
- if (unlikely(insn->reg >= REG_ERROR)) {
- ERR("invalid register %u\n",
- (unsigned int) insn->reg);
- ret = -EINVAL;
- goto end;
- }
- switch (reg[insn->reg].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- ERR("Cast op can only be applied to numeric or floating point registers\n");
- ret = -EINVAL;
- goto end;
- case REG_S64:
- break;
- case REG_DOUBLE:
- break;
- }
- if (insn->op == FILTER_OP_CAST_DOUBLE_TO_S64) {
- if (reg[insn->reg].type != REG_DOUBLE) {
- ERR("Cast expects double\n");
- ret = -EINVAL;
- goto end;
- }
- }
- reg[insn->reg].type = REG_S64;
- next_pc += sizeof(struct cast_op);
- break;
- }
- case FILTER_OP_CAST_NOP:
- {
- next_pc += sizeof(struct cast_op);
- break;
- }
-
- }
- }
-end:
- return ret;
-}
-
-static
-int lttng_filter_specialize_bytecode(struct bytecode_runtime *bytecode)
-{
- void *pc, *next_pc, *start_pc;
- int ret = -EINVAL;
- struct vreg reg[NR_REG];
- int i;
-
- for (i = 0; i < NR_REG; i++) {
- reg[i].type = REG_TYPE_UNKNOWN;
- reg[i].literal = 0;
- }
-
- start_pc = &bytecode->data[0];
- for (pc = next_pc = start_pc; pc - start_pc < bytecode->len;
- pc = next_pc) {
- switch (*(filter_opcode_t *) pc) {
- case FILTER_OP_UNKNOWN:
- default:
- ERR("unknown bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- case FILTER_OP_RETURN:
- ret = 0;
- goto end;
-
- /* binary */
- case FILTER_OP_MUL:
- case FILTER_OP_DIV:
- case FILTER_OP_MOD:
- case FILTER_OP_PLUS:
- case FILTER_OP_MINUS:
- case FILTER_OP_RSHIFT:
- case FILTER_OP_LSHIFT:
- case FILTER_OP_BIN_AND:
- case FILTER_OP_BIN_OR:
- case FILTER_OP_BIN_XOR:
- ERR("unsupported bytecode op %u\n",
- (unsigned int) *(filter_opcode_t *) pc);
- ret = -EINVAL;
- goto end;
-
- case FILTER_OP_EQ:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(reg[REG_R0].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- insn->op = FILTER_OP_EQ_STRING;
- break;
- case REG_S64:
- if (reg[REG_R1].type == REG_S64)
- insn->op = FILTER_OP_EQ_S64;
- else
- insn->op = FILTER_OP_EQ_DOUBLE;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_EQ_DOUBLE;
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_NE:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(reg[REG_R0].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- insn->op = FILTER_OP_NE_STRING;
- break;
- case REG_S64:
- if (reg[REG_R1].type == REG_S64)
- insn->op = FILTER_OP_NE_S64;
- else
- insn->op = FILTER_OP_NE_DOUBLE;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_NE_DOUBLE;
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_GT:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(reg[REG_R0].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- insn->op = FILTER_OP_GT_STRING;
- break;
- case REG_S64:
- if (reg[REG_R1].type == REG_S64)
- insn->op = FILTER_OP_GT_S64;
- else
- insn->op = FILTER_OP_GT_DOUBLE;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_GT_DOUBLE;
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_LT:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(reg[REG_R0].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- insn->op = FILTER_OP_LT_STRING;
- break;
- case REG_S64:
- if (reg[REG_R1].type == REG_S64)
- insn->op = FILTER_OP_LT_S64;
- else
- insn->op = FILTER_OP_LT_DOUBLE;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_LT_DOUBLE;
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_GE:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(reg[REG_R0].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- insn->op = FILTER_OP_GE_STRING;
- break;
- case REG_S64:
- if (reg[REG_R1].type == REG_S64)
- insn->op = FILTER_OP_GE_S64;
- else
- insn->op = FILTER_OP_GE_DOUBLE;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_GE_DOUBLE;
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_LE:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(reg[REG_R0].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- insn->op = FILTER_OP_LE_STRING;
- break;
- case REG_S64:
- if (reg[REG_R1].type == REG_S64)
- insn->op = FILTER_OP_LE_S64;
- else
- insn->op = FILTER_OP_LE_DOUBLE;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_LE_DOUBLE;
- break;
- }
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_EQ_STRING:
- case FILTER_OP_NE_STRING:
- case FILTER_OP_GT_STRING:
- case FILTER_OP_LT_STRING:
- case FILTER_OP_GE_STRING:
- case FILTER_OP_LE_STRING:
- case FILTER_OP_EQ_S64:
- case FILTER_OP_NE_S64:
- case FILTER_OP_GT_S64:
- case FILTER_OP_LT_S64:
- case FILTER_OP_GE_S64:
- case FILTER_OP_LE_S64:
- case FILTER_OP_EQ_DOUBLE:
- case FILTER_OP_NE_DOUBLE:
- case FILTER_OP_GT_DOUBLE:
- case FILTER_OP_LT_DOUBLE:
- case FILTER_OP_GE_DOUBLE:
- case FILTER_OP_LE_DOUBLE:
- {
- reg[REG_R0].type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- /* unary */
- case FILTER_OP_UNARY_PLUS:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- switch(reg[insn->reg].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_S64:
- insn->op = FILTER_OP_UNARY_PLUS_S64;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_UNARY_PLUS_DOUBLE;
- break;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_MINUS:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- switch(reg[insn->reg].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_S64:
- insn->op = FILTER_OP_UNARY_MINUS_S64;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_UNARY_MINUS_DOUBLE;
- break;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_NOT:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- switch(reg[insn->reg].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_S64:
- insn->op = FILTER_OP_UNARY_NOT_S64;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_UNARY_NOT_DOUBLE;
- break;
- }
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_PLUS_S64:
- case FILTER_OP_UNARY_MINUS_S64:
- case FILTER_OP_UNARY_NOT_S64:
- case FILTER_OP_UNARY_PLUS_DOUBLE:
- case FILTER_OP_UNARY_MINUS_DOUBLE:
- case FILTER_OP_UNARY_NOT_DOUBLE:
- {
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- /* logical */
- case FILTER_OP_AND:
- case FILTER_OP_OR:
- {
- next_pc += sizeof(struct logical_op);
- break;
- }
-
- /* load */
- case FILTER_OP_LOAD_FIELD_REF:
- {
- ERR("Unknown field ref type\n");
- ret = -EINVAL;
- goto end;
- }
- case FILTER_OP_LOAD_FIELD_REF_STRING:
- case FILTER_OP_LOAD_FIELD_REF_SEQUENCE:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_S64:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- reg[insn->reg].type = REG_S64;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_DOUBLE:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- reg[insn->reg].type = REG_DOUBLE;
- reg[insn->reg].literal = 0;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
-
- case FILTER_OP_LOAD_STRING:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- reg[insn->reg].type = REG_STRING;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
- break;
- }
-
- case FILTER_OP_LOAD_S64:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- reg[insn->reg].type = REG_S64;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_numeric);
- break;
- }
-
- case FILTER_OP_LOAD_DOUBLE:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- reg[insn->reg].type = REG_DOUBLE;
- reg[insn->reg].literal = 1;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_double);
- break;
- }
-
- /* cast */
- case FILTER_OP_CAST_TO_S64:
- {
- struct cast_op *insn = (struct cast_op *) pc;
-
- switch (reg[insn->reg].type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- ERR("Cast op can only be applied to numeric or floating point registers\n");
- ret = -EINVAL;
- goto end;
- case REG_S64:
- insn->op = FILTER_OP_CAST_NOP;
- break;
- case REG_DOUBLE:
- insn->op = FILTER_OP_CAST_DOUBLE_TO_S64;
- break;
- }
- reg[insn->reg].type = REG_S64;
- next_pc += sizeof(struct cast_op);
- break;
- }
- case FILTER_OP_CAST_DOUBLE_TO_S64:
- {
- struct cast_op *insn = (struct cast_op *) pc;
-
- reg[insn->reg].type = REG_S64;
- next_pc += sizeof(struct cast_op);
- break;
- }
- case FILTER_OP_CAST_NOP:
- {
- next_pc += sizeof(struct cast_op);
- break;
- }
-
-
- }
- }
-end:
- return ret;
-}
-
-static
-int apply_field_reloc(struct ltt_event *event,
- struct bytecode_runtime *runtime,
- uint32_t runtime_len,
- uint32_t reloc_offset,
- const char *field_name)
-{
- const struct lttng_event_desc *desc;
- const struct lttng_event_field *fields, *field = NULL;
- unsigned int nr_fields, i;
- struct field_ref *field_ref;
- struct load_op *op;
- uint32_t field_offset = 0;
-
- dbg_printf("Apply reloc: %u %s\n", reloc_offset, field_name);
-
- /* Ensure that the reloc is within the code */
- if (runtime_len - reloc_offset < sizeof(uint16_t))
- return -EINVAL;
-
- /* Lookup event by name */
- desc = event->desc;
- if (!desc)
- return -EINVAL;
- fields = desc->fields;
- if (!fields)
- return -EINVAL;
- nr_fields = desc->nr_fields;
- for (i = 0; i < nr_fields; i++) {
- if (!strcmp(fields[i].name, field_name)) {
- field = &fields[i];
- break;
- }
- /* compute field offset */
- switch (fields[i].type.atype) {
- case atype_integer:
- case atype_enum:
- field_offset += sizeof(int64_t);
- break;
- case atype_array:
- case atype_sequence:
- field_offset += sizeof(unsigned long);
- field_offset += sizeof(void *);
- break;
- case atype_string:
- field_offset += sizeof(void *);
- break;
- case atype_float:
- field_offset += sizeof(double);
- break;
- default:
- return -EINVAL;
- }
- }
- if (!field)
- return -EINVAL;
-
- /* Check if field offset is too large for 16-bit offset */
- if (field_offset > FILTER_BYTECODE_MAX_LEN)
- return -EINVAL;
-
- /* set type */
- op = (struct load_op *) &runtime->data[reloc_offset];
- field_ref = (struct field_ref *) op->data;
- switch (field->type.atype) {
- case atype_integer:
- case atype_enum:
- op->op = FILTER_OP_LOAD_FIELD_REF_S64;
- break;
- case atype_array:
- case atype_sequence:
- op->op = FILTER_OP_LOAD_FIELD_REF_SEQUENCE;
- break;
- case atype_string:
- op->op = FILTER_OP_LOAD_FIELD_REF_STRING;
- break;
- case atype_float:
- op->op = FILTER_OP_LOAD_FIELD_REF_DOUBLE;
- break;
- default:
- return -EINVAL;
- }
- /* set offset */
- field_ref->offset = (uint16_t) field_offset;
- return 0;
-}
-
-/*
- * Take a bytecode with reloc table and link it to an event to create a
- * bytecode runtime.
- */
-static
-int _lttng_filter_event_link_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- int ret, offset, next_offset;
- struct bytecode_runtime *runtime = NULL;
- size_t runtime_alloc_len;
-
- if (!filter_bytecode)
- return 0;
- /* Even is not connected to any description */
- if (!event->desc)
- return 0;
- /* Bytecode already linked */
- if (event->filter || event->filter_data)
- return 0;
-
- dbg_printf("Linking\n");
-
- /* We don't need the reloc table in the runtime */
- runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset;
- runtime = zmalloc(runtime_alloc_len);
- if (!runtime) {
- ret = -ENOMEM;
- goto link_error;
- }
- runtime->len = filter_bytecode->reloc_offset;
- /* copy original bytecode */
- memcpy(runtime->data, filter_bytecode->data, runtime->len);
- /*
- * apply relocs. Those are a uint16_t (offset in bytecode)
- * followed by a string (field name).
- */
- for (offset = filter_bytecode->reloc_offset;
- offset < filter_bytecode->len;
- offset = next_offset) {
- uint16_t reloc_offset =
- *(uint16_t *) &filter_bytecode->data[offset];
- const char *field_name =
- (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)];
-
- ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
- if (ret) {
- goto link_error;
- }
- next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1;
- }
- /* Validate bytecode */
- ret = lttng_filter_validate_bytecode(runtime);
- if (ret) {
- goto link_error;
- }
- /* Specialize bytecode */
- ret = lttng_filter_specialize_bytecode(runtime);
- if (ret) {
- goto link_error;
- }
- event->filter_data = runtime;
- event->filter = lttng_filter_interpret_bytecode;
- return 0;
-
-link_error:
- event->filter = lttng_filter_false;
- free(runtime);
- return ret;
-}
-
-void lttng_filter_event_link_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- int ret;
-
- ret = _lttng_filter_event_link_bytecode(event, filter_bytecode);
- if (ret) {
- fprintf(stderr, "[lttng filter] error linking event bytecode\n");
- }
-}
-
-/*
- * Link bytecode to all events for a wildcard. Skips events that already
- * have a bytecode linked.
- * We do not set each event's filter_bytecode field, because they do not
- * own the filter_bytecode: the wildcard owns it.
- */
-void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard)
-{
- struct ltt_event *event;
- int ret;
-
- if (!wildcard->filter_bytecode)
- return;
-
- cds_list_for_each_entry(event, &wildcard->events, wildcard_list) {
- if (event->filter)
- continue;
- ret = _lttng_filter_event_link_bytecode(event,
- wildcard->filter_bytecode);
- if (ret) {
- fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n");
- }
-
- }
- return;
-}
-
-/*
- * Need to attach filter to an event before starting tracing for the
- * session. We own the filter_bytecode if we return success.
- */
-int lttng_filter_event_attach_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- if (event->chan->session->been_active)
- return -EPERM;
- if (event->filter_bytecode)
- return -EEXIST;
- event->filter_bytecode = filter_bytecode;
- return 0;
-}
-
-/*
- * Need to attach filter to a wildcard before starting tracing for the
- * session. We own the filter_bytecode if we return success.
- */
-int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard,
- struct lttng_ust_filter_bytecode *filter_bytecode)
-{
- if (wildcard->chan->session->been_active)
- return -EPERM;
- if (wildcard->filter_bytecode)
- return -EEXIST;
- wildcard->filter_bytecode = filter_bytecode;
- return 0;
-}
projects / lttng-ust.git / blobdiff