+++ /dev/null
-/*
- * lttng-filter-specialize.c
- *
- * LTTng UST filter code specializer.
- *
- * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * 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.
- */
-
-#define _LGPL_SOURCE
-#include "lttng-filter.h"
-
-int lttng_filter_specialize_bytecode(struct bytecode_runtime *bytecode)
-{
- void *pc, *next_pc, *start_pc;
- int ret = -EINVAL;
- struct vstack _stack;
- struct vstack *stack = &_stack;
-
- vstack_init(stack);
-
- 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(vstack_ax(stack)->type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- insn->op = FILTER_OP_EQ_STRING;
- break;
- case REG_S64:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_EQ_S64;
- else
- insn->op = FILTER_OP_EQ_DOUBLE_S64;
- break;
- case REG_DOUBLE:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_EQ_S64_DOUBLE;
- else
- insn->op = FILTER_OP_EQ_DOUBLE;
- break;
- case REG_UNKNOWN:
- break; /* Dynamic typing. */
- }
- /* Pop 2, push 1 */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_NE:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(vstack_ax(stack)->type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- insn->op = FILTER_OP_NE_STRING;
- break;
- case REG_S64:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_NE_S64;
- else
- insn->op = FILTER_OP_NE_DOUBLE_S64;
- break;
- case REG_DOUBLE:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_NE_S64_DOUBLE;
- else
- insn->op = FILTER_OP_NE_DOUBLE;
- break;
- case REG_UNKNOWN:
- break; /* Dynamic typing. */
- }
- /* Pop 2, push 1 */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_GT:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(vstack_ax(stack)->type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- insn->op = FILTER_OP_GT_STRING;
- break;
- case REG_S64:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_GT_S64;
- else
- insn->op = FILTER_OP_GT_DOUBLE_S64;
- break;
- case REG_DOUBLE:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_GT_S64_DOUBLE;
- else
- insn->op = FILTER_OP_GT_DOUBLE;
- break;
- case REG_UNKNOWN:
- break; /* Dynamic typing. */
- }
- /* Pop 2, push 1 */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_LT:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(vstack_ax(stack)->type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- insn->op = FILTER_OP_LT_STRING;
- break;
- case REG_S64:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_LT_S64;
- else
- insn->op = FILTER_OP_LT_DOUBLE_S64;
- break;
- case REG_DOUBLE:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_LT_S64_DOUBLE;
- else
- insn->op = FILTER_OP_LT_DOUBLE;
- break;
- case REG_UNKNOWN:
- break; /* Dynamic typing. */
- }
- /* Pop 2, push 1 */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
-
- case FILTER_OP_GE:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(vstack_ax(stack)->type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- insn->op = FILTER_OP_GE_STRING;
- break;
- case REG_S64:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_GE_S64;
- else
- insn->op = FILTER_OP_GE_DOUBLE_S64;
- break;
- case REG_DOUBLE:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_GE_S64_DOUBLE;
- else
- insn->op = FILTER_OP_GE_DOUBLE;
- break;
- case REG_UNKNOWN:
- break; /* Dynamic typing. */
- }
- /* Pop 2, push 1 */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct binary_op);
- break;
- }
- case FILTER_OP_LE:
- {
- struct binary_op *insn = (struct binary_op *) pc;
-
- switch(vstack_ax(stack)->type) {
- default:
- ERR("unknown register type\n");
- ret = -EINVAL;
- goto end;
-
- case REG_STRING:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- insn->op = FILTER_OP_LE_STRING;
- break;
- case REG_S64:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_LE_S64;
- else
- insn->op = FILTER_OP_LE_DOUBLE_S64;
- break;
- case REG_DOUBLE:
- if (vstack_bx(stack)->type == REG_UNKNOWN)
- break;
- if (vstack_bx(stack)->type == REG_S64)
- insn->op = FILTER_OP_LE_S64_DOUBLE;
- else
- insn->op = FILTER_OP_LE_DOUBLE;
- break;
- case REG_UNKNOWN:
- break; /* Dynamic typing. */
- }
- vstack_ax(stack)->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:
- case FILTER_OP_EQ_DOUBLE_S64:
- case FILTER_OP_NE_DOUBLE_S64:
- case FILTER_OP_GT_DOUBLE_S64:
- case FILTER_OP_LT_DOUBLE_S64:
- case FILTER_OP_GE_DOUBLE_S64:
- case FILTER_OP_LE_DOUBLE_S64:
- case FILTER_OP_EQ_S64_DOUBLE:
- case FILTER_OP_NE_S64_DOUBLE:
- case FILTER_OP_GT_S64_DOUBLE:
- case FILTER_OP_LT_S64_DOUBLE:
- case FILTER_OP_GE_S64_DOUBLE:
- case FILTER_OP_LE_S64_DOUBLE:
- {
- /* Pop 2, push 1 */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->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(vstack_ax(stack)->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;
- case REG_UNKNOWN: /* Dynamic typing. */
- break;
- }
- /* Pop 1, push 1 */
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_MINUS:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- switch(vstack_ax(stack)->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;
- case REG_UNKNOWN: /* Dynamic typing. */
- break;
- }
- /* Pop 1, push 1 */
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- case FILTER_OP_UNARY_NOT:
- {
- struct unary_op *insn = (struct unary_op *) pc;
-
- switch(vstack_ax(stack)->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;
- case REG_UNKNOWN: /* Dynamic typing. */
- break;
- }
- /* Pop 1, push 1 */
- 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:
- {
- /* Pop 1, push 1 */
- next_pc += sizeof(struct unary_op);
- break;
- }
-
- /* logical */
- case FILTER_OP_AND:
- case FILTER_OP_OR:
- {
- /* Continue to next instruction */
- /* Pop 1 when jump not taken */
- if (vstack_pop(stack)) {
- ret = -EINVAL;
- goto end;
- }
- next_pc += sizeof(struct logical_op);
- break;
- }
-
- /* load field ref */
- case FILTER_OP_LOAD_FIELD_REF:
- {
- ERR("Unknown field ref type\n");
- ret = -EINVAL;
- goto end;
- }
- /* get context ref */
- case FILTER_OP_GET_CONTEXT_REF:
- {
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_UNKNOWN;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_STRING:
- case FILTER_OP_LOAD_FIELD_REF_SEQUENCE:
- case FILTER_OP_GET_CONTEXT_REF_STRING:
- {
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_STRING;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_S64:
- case FILTER_OP_GET_CONTEXT_REF_S64:
- {
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
- case FILTER_OP_LOAD_FIELD_REF_DOUBLE:
- case FILTER_OP_GET_CONTEXT_REF_DOUBLE:
- {
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_DOUBLE;
- next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
- break;
- }
-
- /* load from immediate operand */
- case FILTER_OP_LOAD_STRING:
- {
- struct load_op *insn = (struct load_op *) pc;
-
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_STRING;
- next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
- break;
- }
-
- case FILTER_OP_LOAD_S64:
- {
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct load_op)
- + sizeof(struct literal_numeric);
- break;
- }
-
- case FILTER_OP_LOAD_DOUBLE:
- {
- if (vstack_push(stack)) {
- ret = -EINVAL;
- goto end;
- }
- vstack_ax(stack)->type = REG_DOUBLE;
- 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 (vstack_ax(stack)->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;
- case REG_UNKNOWN:
- break;
- }
- /* Pop 1, push 1 */
- vstack_ax(stack)->type = REG_S64;
- next_pc += sizeof(struct cast_op);
- break;
- }
- case FILTER_OP_CAST_DOUBLE_TO_S64:
- {
- /* Pop 1, push 1 */
- vstack_ax(stack)->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;
-}