X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-filter.c;h=8114db6092b0b72365361733a394590ca3c46bed;hb=7d34f27dce903a88241e96787c1f900b6ea08245;hp=6c3eda4ba554a28e692194a71170ae6569d7a824;hpb=f488575f3420027d33050e779e1e3916e3b91c8c;p=lttng-ust.git diff --git a/liblttng-ust/lttng-filter.c b/liblttng-ust/lttng-filter.c index 6c3eda4b..8114db60 100644 --- a/liblttng-ust/lttng-filter.c +++ b/liblttng-ust/lttng-filter.c @@ -3,23 +3,28 @@ * * LTTng UST filter code. * - * Copyright (C) 2010-2012 Mathieu Desnoyers + * Copyright (C) 2010-2016 Mathieu Desnoyers * - * 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. */ +#define _LGPL_SOURCE #include #include "lttng-filter.h" @@ -102,13 +107,14 @@ static const char *opnames[] = { [ FILTER_OP_AND ] = "AND", [ FILTER_OP_OR ] = "OR", - /* load */ + /* load field ref */ [ 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", + /* load from immediate operand */ [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING", [ FILTER_OP_LOAD_S64 ] = "LOAD_S64", [ FILTER_OP_LOAD_DOUBLE ] = "LOAD_DOUBLE", @@ -117,6 +123,26 @@ static const char *opnames[] = { [ FILTER_OP_CAST_TO_S64 ] = "CAST_TO_S64", [ FILTER_OP_CAST_DOUBLE_TO_S64 ] = "CAST_DOUBLE_TO_S64", [ FILTER_OP_CAST_NOP ] = "CAST_NOP", + + /* get context ref */ + [ FILTER_OP_GET_CONTEXT_REF ] = "GET_CONTEXT_REF", + [ FILTER_OP_GET_CONTEXT_REF_STRING ] = "GET_CONTEXT_REF_STRING", + [ FILTER_OP_GET_CONTEXT_REF_S64 ] = "GET_CONTEXT_REF_S64", + [ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = "GET_CONTEXT_REF_DOUBLE", + + /* load userspace field ref */ + [ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = "LOAD_FIELD_REF_USER_STRING", + [ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = "LOAD_FIELD_REF_USER_SEQUENCE", + + /* + * load immediate star globbing pattern (literal string) + * from immediate. + */ + [ FILTER_OP_LOAD_STAR_GLOB_STRING ] = "LOAD_STAR_GLOB_STRING", + + /* globbing pattern binary operator: apply to */ + [ FILTER_OP_EQ_STAR_GLOB_STRING ] = "EQ_STAR_GLOB_STRING", + [ FILTER_OP_NE_STAR_GLOB_STRING ] = "NE_STAR_GLOB_STRING", }; const char *print_op(enum filter_op op) @@ -128,7 +154,7 @@ const char *print_op(enum filter_op op) } static -int apply_field_reloc(struct ltt_event *event, +int apply_field_reloc(struct lttng_event *event, struct bytecode_runtime *runtime, uint32_t runtime_len, uint32_t reloc_offset, @@ -141,11 +167,7 @@ int apply_field_reloc(struct ltt_event *event, 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; + dbg_printf("Apply field reloc: %u %s\n", reloc_offset, field_name); /* Lookup event by name */ desc = event->desc; @@ -214,13 +236,110 @@ int apply_field_reloc(struct ltt_event *event, return 0; } +static +int apply_context_reloc(struct lttng_event *event, + struct bytecode_runtime *runtime, + uint32_t runtime_len, + uint32_t reloc_offset, + const char *context_name) +{ + struct field_ref *field_ref; + struct load_op *op; + struct lttng_ctx_field *ctx_field; + int idx; + struct lttng_session *session = runtime->p.session; + + dbg_printf("Apply context reloc: %u %s\n", reloc_offset, context_name); + + /* Get context index */ + idx = lttng_get_context_index(session->ctx, context_name); + if (idx < 0) { + if (lttng_context_is_app(context_name)) { + int ret; + + ret = lttng_ust_add_app_context_to_ctx_rcu(context_name, + &session->ctx); + if (ret) + return ret; + idx = lttng_get_context_index(session->ctx, + context_name); + if (idx < 0) + return -ENOENT; + } else { + return -ENOENT; + } + } + /* Check if idx is too large for 16-bit offset */ + if (idx > FILTER_BYTECODE_MAX_LEN - 1) + return -EINVAL; + + /* Get context return type */ + ctx_field = &session->ctx->fields[idx]; + op = (struct load_op *) &runtime->data[reloc_offset]; + field_ref = (struct field_ref *) op->data; + switch (ctx_field->event_field.type.atype) { + case atype_integer: + case atype_enum: + op->op = FILTER_OP_GET_CONTEXT_REF_S64; + break; + /* Sequence and array supported as string */ + case atype_string: + case atype_array: + case atype_sequence: + op->op = FILTER_OP_GET_CONTEXT_REF_STRING; + break; + case atype_float: + op->op = FILTER_OP_GET_CONTEXT_REF_DOUBLE; + break; + case atype_dynamic: + op->op = FILTER_OP_GET_CONTEXT_REF; + break; + default: + return -EINVAL; + } + /* set offset to context index within channel contexts */ + field_ref->offset = (uint16_t) idx; + return 0; +} + +static +int apply_reloc(struct lttng_event *event, + struct bytecode_runtime *runtime, + uint32_t runtime_len, + uint32_t reloc_offset, + const char *name) +{ + struct load_op *op; + + dbg_printf("Apply reloc: %u %s\n", reloc_offset, name); + + /* Ensure that the reloc is within the code */ + if (runtime_len - reloc_offset < sizeof(uint16_t)) + return -EINVAL; + + op = (struct load_op *) &runtime->data[reloc_offset]; + switch (op->op) { + case FILTER_OP_LOAD_FIELD_REF: + return apply_field_reloc(event, runtime, runtime_len, + reloc_offset, name); + case FILTER_OP_GET_CONTEXT_REF: + return apply_context_reloc(event, runtime, runtime_len, + reloc_offset, name); + default: + ERR("Unknown reloc op type %u\n", op->op); + return -EINVAL; + } + return 0; +} + static int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode, - struct ltt_event *event) + struct lttng_event *event) { struct lttng_bytecode_runtime *bc_runtime; - cds_list_for_each_entry(bc_runtime, &event->bytecode_runtime, node) { + cds_list_for_each_entry(bc_runtime, + &event->bytecode_runtime_head, node) { if (bc_runtime->bc == filter_bytecode) return 1; } @@ -232,8 +351,9 @@ int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode, * bytecode runtime. */ static -int _lttng_filter_event_link_bytecode(struct ltt_event *event, - struct lttng_ust_filter_bytecode_node *filter_bytecode) +int _lttng_filter_event_link_bytecode(struct lttng_event *event, + struct lttng_ust_filter_bytecode_node *filter_bytecode, + struct cds_list_head *insert_loc) { int ret, offset, next_offset; struct bytecode_runtime *runtime = NULL; @@ -241,9 +361,6 @@ int _lttng_filter_event_link_bytecode(struct ltt_event *event, if (!filter_bytecode) return 0; - /* Event is not connected to any description */ - if (!event->desc) - return 0; /* Bytecode already linked */ if (bytecode_is_linked(filter_bytecode, event)) return 0; @@ -255,9 +372,10 @@ int _lttng_filter_event_link_bytecode(struct ltt_event *event, runtime = zmalloc(runtime_alloc_len); if (!runtime) { ret = -ENOMEM; - goto link_error; + goto alloc_error; } runtime->p.bc = filter_bytecode; + runtime->p.session = event->chan->session; runtime->len = filter_bytecode->bc.reloc_offset; /* copy original bytecode */ memcpy(runtime->data, filter_bytecode->bc.data, runtime->len); @@ -270,14 +388,14 @@ int _lttng_filter_event_link_bytecode(struct ltt_event *event, offset = next_offset) { uint16_t reloc_offset = *(uint16_t *) &filter_bytecode->bc.data[offset]; - const char *field_name = + const char *name = (const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)]; - ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name); + ret = apply_reloc(event, runtime, runtime->len, reloc_offset, name); if (ret) { goto link_error; } - next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1; + next_offset = offset + sizeof(uint16_t) + strlen(name) + 1; } /* Validate bytecode */ ret = lttng_filter_validate_bytecode(runtime); @@ -290,114 +408,108 @@ int _lttng_filter_event_link_bytecode(struct ltt_event *event, goto link_error; } runtime->p.filter = lttng_filter_interpret_bytecode; - /* TODO: add with prio */ - cds_list_add_rcu(&runtime->p.node, &event->bytecode_runtime); + runtime->p.link_failed = 0; + cds_list_add_rcu(&runtime->p.node, insert_loc); dbg_printf("Linking successful.\n"); return 0; link_error: runtime->p.filter = lttng_filter_false; - /* TODO: add with prio */ - cds_list_add_rcu(&runtime->p.node, &event->bytecode_runtime); + runtime->p.link_failed = 1; + cds_list_add_rcu(&runtime->p.node, insert_loc); +alloc_error: dbg_printf("Linking failed.\n"); return ret; } -void lttng_filter_event_link_bytecode(struct ltt_event *event) -{ - struct lttng_ust_filter_bytecode_node *filter_bytecode; - int ret; - - cds_list_for_each_entry(filter_bytecode, &event->filter_bytecode, node) { - dbg_printf("linking bytecode\n"); - ret = _lttng_filter_event_link_bytecode(event, filter_bytecode); - if (ret) { - dbg_printf("[lttng filter] warning: cannot link event bytecode\n"); - } - } -} - -void lttng_filter_event_link_wildcard_bytecode(struct ltt_event *event, - struct session_wildcard *wildcard) +void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime) { - struct lttng_ust_filter_bytecode_node *filter_bytecode; - int ret; + struct lttng_ust_filter_bytecode_node *bc = runtime->bc; - cds_list_for_each_entry(filter_bytecode, &wildcard->filter_bytecode, node) { - dbg_printf("linking bytecode\n"); - ret = _lttng_filter_event_link_bytecode(event, filter_bytecode); - if (ret) { - dbg_printf("[lttng filter] error linking wildcard bytecode\n"); - } - } + if (!bc->enabler->enabled || runtime->link_failed) + runtime->filter = lttng_filter_false; + else + runtime->filter = lttng_filter_interpret_bytecode; } /* - * Link bytecode to all events for a wildcard. - * The "is_linked" check in _lttng_filter_event_link_bytecode() ensures - * that we don't link the same bytecode to an event more than once. + * Link bytecode for all enablers referenced by an event. */ -void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard) +void lttng_enabler_event_link_bytecode(struct lttng_event *event, + struct lttng_enabler *enabler) { - struct ltt_event *event; - - if (cds_list_empty(&wildcard->filter_bytecode)) - return; - cds_list_for_each_entry(event, &wildcard->events, wildcard_list) { + struct lttng_ust_filter_bytecode_node *bc; + struct lttng_bytecode_runtime *runtime; + + /* Can only be called for events with desc attached */ + assert(event->desc); + + /* Link each bytecode. */ + cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) { + int found = 0, ret; + struct cds_list_head *insert_loc; + + cds_list_for_each_entry(runtime, + &event->bytecode_runtime_head, node) { + if (runtime->bc == bc) { + found = 1; + break; + } + } + /* Skip bytecode already linked */ + if (found) + continue; + + /* + * Insert at specified priority (seqnum) in increasing + * order. + */ + cds_list_for_each_entry_reverse(runtime, + &event->bytecode_runtime_head, node) { + if (runtime->bc->bc.seqnum < bc->bc.seqnum) { + /* insert here */ + insert_loc = &runtime->node; + goto add_within; + } + } + /* Add to head to list */ + insert_loc = &event->bytecode_runtime_head; + add_within: dbg_printf("linking bytecode\n"); - lttng_filter_event_link_wildcard_bytecode(event, wildcard); + ret = _lttng_filter_event_link_bytecode(event, bc, + insert_loc); + if (ret) { + dbg_printf("[lttng filter] warning: cannot link event 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_node *filter_bytecode) -{ - cds_list_add(&filter_bytecode->node, &event->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. + * We own the filter_bytecode if we return success. */ -int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard, +int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler, struct lttng_ust_filter_bytecode_node *filter_bytecode) { - cds_list_add(&filter_bytecode->node, &wildcard->filter_bytecode); + cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head); return 0; } -void lttng_free_event_filter_bytecode(struct ltt_event *event) -{ - struct lttng_ust_filter_bytecode_node *filter_bytecode, *tmp; - - cds_list_for_each_entry_safe(filter_bytecode, tmp, - &event->filter_bytecode, node) { - free(filter_bytecode); - } -} - -void lttng_free_wildcard_filter_bytecode(struct session_wildcard *wildcard) +void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler) { struct lttng_ust_filter_bytecode_node *filter_bytecode, *tmp; cds_list_for_each_entry_safe(filter_bytecode, tmp, - &wildcard->filter_bytecode, node) { + &enabler->filter_bytecode_head, node) { free(filter_bytecode); } } -void lttng_free_event_filter_runtime(struct ltt_event *event) +void lttng_free_event_filter_runtime(struct lttng_event *event) { struct bytecode_runtime *runtime, *tmp; cds_list_for_each_entry_safe(runtime, tmp, - &event->bytecode_runtime, p.node) { + &event->bytecode_runtime_head, p.node) { free(runtime); } }