X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-filter.h;h=cc15c1546fa469ae1f32871d8a74092662f990bf;hb=HEAD;hp=bf553cea22427b373dac9264c0ab525ee3f4e04f;hpb=d97f9b785f05c29dbabb57da9a32c8c4317da8d3;p=lttng-ust.git diff --git a/liblttng-ust/lttng-filter.h b/liblttng-ust/lttng-filter.h deleted file mode 100644 index bf553cea..00000000 --- a/liblttng-ust/lttng-filter.h +++ /dev/null @@ -1,303 +0,0 @@ -#ifndef _LTTNG_FILTER_H -#define _LTTNG_FILTER_H - -/* - * lttng-filter.h - * - * LTTng UST filter header. - * - * Copyright (C) 2010-2016 Mathieu Desnoyers - * - * 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: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "filter-bytecode.h" - -/* Filter stack length, in number of entries */ -#define FILTER_STACK_LEN 10 /* includes 2 dummy */ -#define FILTER_STACK_EMPTY 1 - -#define FILTER_MAX_DATA_LEN 65536 - -#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 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 in %s:%s@%u] " fmt, \ - __FILE__, __func__, __LINE__, ## args); \ -} while (0) -#endif - -/* 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 code[0]; -}; - -enum entry_type { - REG_S64, - REG_U64, - REG_DOUBLE, - REG_STRING, - REG_STAR_GLOB_STRING, - REG_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 { - int top; /* top of stack */ - struct vstack_entry e[FILTER_STACK_LEN]; -}; - -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, -}; - -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 { - 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; - struct load_ptr ptr; - } u; -}; - -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(const struct lttng_event_desc *event_desc, - struct bytecode_runtime *bytecode); - -uint64_t lttng_filter_false(void *filter_data, - const char *filter_stack_data); -uint64_t lttng_filter_interpret_bytecode(void *filter_data, - const char *filter_stack_data); - -#endif /* _LTTNG_FILTER_H */