*
* LTTng filter generate intermediate representation
*
- * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright 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, version 2.1 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * 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 <stdio.h>
#include "filter-ir.h"
#include <common/macros.h>
+#include <common/string-utils/string-utils.h>
static
struct ir_op *generate_ir_recursive(struct filter_parser_ctx *ctx,
case IR_DATA_NUMERIC:
case IR_DATA_FIELD_REF:
case IR_DATA_GET_CONTEXT_REF:
+ case IR_DATA_EXPRESSION:
/* ok */
break;
}
return op;
}
+static
+enum ir_load_string_type get_literal_string_type(const char *string)
+{
+ assert(string);
+
+ if (strutils_is_star_glob_pattern(string)) {
+ if (strutils_is_star_at_the_end_only_glob_pattern(string)) {
+ return IR_LOAD_STRING_TYPE_GLOB_STAR_END;
+ }
+
+ return IR_LOAD_STRING_TYPE_GLOB_STAR;
+ }
+
+ return IR_LOAD_STRING_TYPE_PLAIN;
+}
+
static
struct ir_op *make_op_load_string(char *string, enum ir_side side)
{
op->data_type = IR_DATA_STRING;
op->signedness = IR_SIGN_UNKNOWN;
op->side = side;
- op->u.load.u.string = strdup(string);
- if (!op->u.load.u.string) {
+ op->u.load.u.string.type = get_literal_string_type(string);
+ op->u.load.u.string.value = strdup(string);
+ if (!op->u.load.u.string.value) {
free(op);
return NULL;
}
}
static
-struct ir_op *make_op_load_field_ref(char *string, enum ir_side side)
+void free_load_expression(struct ir_load_expression *load_expression)
{
- struct ir_op *op;
+ struct ir_load_expression_op *exp_op;
- op = calloc(sizeof(struct ir_op), 1);
- if (!op)
+ if (!load_expression)
+ return;
+ exp_op = load_expression->child;
+ for (;;) {
+ struct ir_load_expression_op *prev_exp_op;
+
+ if (!exp_op)
+ break;
+ switch (exp_op->type) {
+ case IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT:
+ case IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT:
+ case IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT:
+ case IR_LOAD_EXPRESSION_GET_INDEX:
+ case IR_LOAD_EXPRESSION_LOAD_FIELD:
+ break;
+ case IR_LOAD_EXPRESSION_GET_SYMBOL:
+ free(exp_op->u.symbol);
+ break;
+ }
+ prev_exp_op = exp_op;
+ exp_op = exp_op->next;
+ free(prev_exp_op);
+ }
+ free(load_expression);
+}
+
+/*
+ * Returns the first node of the chain, after initializing the next
+ * pointers.
+ */
+static
+struct filter_node *load_expression_get_forward_chain(struct filter_node *node)
+{
+ struct filter_node *prev_node;
+
+ for (;;) {
+ assert(node->type == NODE_EXPRESSION);
+ prev_node = node;
+ node = node->u.expression.prev;
+ if (!node) {
+ break;
+ }
+ node->u.expression.next = prev_node;
+ }
+ return prev_node;
+}
+
+static
+struct ir_load_expression *create_load_expression(struct filter_node *node)
+{
+ struct ir_load_expression *load_exp;
+ struct ir_load_expression_op *load_exp_op, *prev_op;
+ char *str;
+
+ /* Get forward chain. */
+ node = load_expression_get_forward_chain(node);
+ if (!node)
return NULL;
- op->op = IR_OP_LOAD;
- op->data_type = IR_DATA_FIELD_REF;
- op->signedness = IR_SIGN_DYN;
- op->side = side;
- op->u.load.u.ref = strdup(string);
- if (!op->u.load.u.ref) {
- free(op);
+ load_exp = calloc(sizeof(struct ir_load_expression), 1);
+ if (!load_exp)
return NULL;
+
+ /* Root */
+ load_exp_op = calloc(sizeof(struct ir_load_expression_op), 1);
+ if (!load_exp_op)
+ goto error;
+ load_exp->child = load_exp_op;
+ str = node->u.expression.u.string;
+ if (!strcmp(str, "$ctx")) {
+ load_exp_op->type = IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT;
+ node = node->u.expression.next;
+ if (!node) {
+ fprintf(stderr, "[error] Expecting identifier after \'%s\'\n", str);
+ goto error;
+ }
+ str = node->u.expression.u.string;
+ } else if (!strcmp(str, "$app")) {
+ load_exp_op->type = IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT;
+ node = node->u.expression.next;
+ if (!node) {
+ fprintf(stderr, "[error] Expecting identifier after \'%s\'\n", str);
+ goto error;
+ }
+ str = node->u.expression.u.string;
+ } else if (str[0] == '$') {
+ fprintf(stderr, "[error] Unexpected identifier \'%s\'\n", str);
+ goto error;
+ } else {
+ load_exp_op->type = IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT;
}
- return op;
+
+ for (;;) {
+ struct filter_node *bracket_node;
+
+ prev_op = load_exp_op;
+ load_exp_op = calloc(sizeof(struct ir_load_expression_op), 1);
+ if (!load_exp_op)
+ goto error;
+ prev_op->next = load_exp_op;
+ load_exp_op->type = IR_LOAD_EXPRESSION_GET_SYMBOL;
+ load_exp_op->u.symbol = strdup(str);
+ if (!load_exp_op->u.symbol)
+ goto error;
+
+ /* Explore brackets from current node. */
+ for (bracket_node = node->u.expression.next_bracket;
+ bracket_node != NULL;
+ bracket_node = bracket_node->u.expression.next_bracket) {
+ prev_op = load_exp_op;
+ load_exp_op = calloc(sizeof(struct ir_load_expression_op), 1);
+ if (!load_exp_op)
+ goto error;
+ prev_op->next = load_exp_op;
+ load_exp_op->type = IR_LOAD_EXPRESSION_GET_INDEX;
+ load_exp_op->u.index = bracket_node->u.expression.u.constant;
+ }
+ /* Go to next chain element. */
+ node = node->u.expression.next;
+ if (!node)
+ break;
+ str = node->u.expression.u.string;
+ }
+ /* Add final load field */
+ prev_op = load_exp_op;
+ load_exp_op = calloc(sizeof(struct ir_load_expression_op), 1);
+ if (!load_exp_op)
+ goto error;
+ prev_op->next = load_exp_op;
+ load_exp_op->type = IR_LOAD_EXPRESSION_LOAD_FIELD;
+ return load_exp;
+
+error:
+ free_load_expression(load_exp);
+ return NULL;
}
static
-struct ir_op *make_op_load_get_context_ref(char *string, enum ir_side side)
+struct ir_op *make_op_load_expression(struct filter_node *node,
+ enum ir_side side)
{
struct ir_op *op;
if (!op)
return NULL;
op->op = IR_OP_LOAD;
- op->data_type = IR_DATA_GET_CONTEXT_REF;
+ op->data_type = IR_DATA_EXPRESSION;
op->signedness = IR_SIGN_DYN;
op->side = side;
- op->u.load.u.ref = strdup(string);
- if (!op->u.load.u.ref) {
- free(op);
- return NULL;
+ op->u.load.u.expression = create_load_expression(node);
+ if (!op->u.load.u.expression) {
+ goto error;
}
return op;
+
+error:
+ free_load_expression(op->u.load.u.expression);
+ free(op);
+ return NULL;
}
static
child, side);
}
-#if 0
-static
-struct ir_op *make_op_binary_numeric(enum op_type bin_op_type,
- const char *op_str, struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- struct ir_op *op = NULL;
-
- if (right->data_type == IR_DATA_STRING
- || right->data_type == IR_DATA_STRING) {
- fprintf(stderr, "[error] binary operation '%s' not allowed on string literal\n", op_str);
- goto error;
- }
- if (left->data_type == IR_DATA_UNKNOWN
- || right->data_type == IR_DATA_UNKNOWN) {
- fprintf(stderr, "[error] binary operation '%s' has unknown type for both children\n", op_str);
- goto error;
-
- }
-
- op = calloc(sizeof(struct ir_op_binary), 1);
- if (!op)
- return NULL;
- op->op = IR_OP_BINARY;
- op->u.binary.type = bin_op_type;
- op->u.binary.left = left;
- op->u.binary.right = right;
- op->side = side;
-
- /*
- * The field that is not a field ref will select type.
- */
- if (left->data_type != IR_DATA_FIELD_REF
- && left->data_type != IR_DATA_GET_CONTEXT_REF)
- op->data_type = left->data_type;
- else
- op->data_type = right->data_type;
-
- if (left->signedness == IR_SIGNED
- || right->signedness == IR_SIGNED) {
- op->signedness = IR_SIGNED;
- } else if (left->signedness == IR_SIGN_DYN
- || right->signedness == IR_SIGN_DYN) {
- op->signedness = IR_SIGN_DYN;
- } else if (left->signedness == IR_UNSIGNED
- && right->signedness == IR_UNSIGNED) {
- op->signedness = IR_UNSIGNED;
- } else {
- op->signedness = IR_SIGN_UNKNOWN;
- }
-
- return op;
-
-error:
- free(op);
- return NULL;
-}
-
-static
-struct ir_op *make_op_binary_mul(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_MUL, "*", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_div(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_DIV, "/", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_mod(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_MOD, "%", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_plus(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_PLUS, "+", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_minus(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_MINUS, "-", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_rshift(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_RSHIFT, ">>", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_lshift(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_LSHIFT, "<<", left, right, side);
-}
-
static
-struct ir_op *make_op_binary_and(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
+struct ir_op *make_op_unary_bit_not(struct ir_op *child, enum ir_side side)
{
- return make_op_binary_numeric(AST_OP_BIN_AND, "&", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_or(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_BIN_OR, "|", left, right, side);
-}
-
-static
-struct ir_op *make_op_binary_xor(struct ir_op *left, struct ir_op *right,
- enum ir_side side)
-{
- return make_op_binary_numeric(AST_OP_BIN_XOR, "^", left, right, side);
+ return make_op_unary(AST_UNARY_BIT_NOT, "~", child->signedness,
+ child, side);
}
-#endif //0
static
struct ir_op *make_op_binary_compare(enum op_type bin_op_type,
return NULL;
}
+static
+struct ir_op *make_op_binary_bitwise(enum op_type bin_op_type,
+ const char *op_str, struct ir_op *left, struct ir_op *right,
+ enum ir_side side)
+{
+ struct ir_op *op = NULL;
+
+ if (left->data_type == IR_DATA_UNKNOWN
+ || right->data_type == IR_DATA_UNKNOWN) {
+ fprintf(stderr, "[error] bitwise binary operation '%s' has unknown operand type\n", op_str);
+ goto error;
+
+ }
+ if (left->data_type == IR_DATA_STRING
+ || right->data_type == IR_DATA_STRING) {
+ fprintf(stderr, "[error] bitwise binary operation '%s' cannot have string operand\n", op_str);
+ goto error;
+ }
+ if (left->data_type == IR_DATA_FLOAT
+ || right->data_type == IR_DATA_FLOAT) {
+ fprintf(stderr, "[error] bitwise binary operation '%s' cannot have floating point operand\n", op_str);
+ goto error;
+ }
+
+ op = calloc(sizeof(struct ir_op), 1);
+ if (!op)
+ return NULL;
+ op->op = IR_OP_BINARY;
+ op->u.binary.type = bin_op_type;
+ op->u.binary.left = left;
+ op->u.binary.right = right;
+
+ /* we return a signed numeric */
+ op->data_type = IR_DATA_NUMERIC;
+ op->signedness = IR_SIGNED;
+ op->side = side;
+
+ return op;
+
+error:
+ free(op);
+ return NULL;
+}
+
static
struct ir_op *make_op_binary_logical_and(struct ir_op *left, struct ir_op *right,
enum ir_side side)
return make_op_binary_logical(AST_OP_OR, "||", left, right, side);
}
+static
+struct ir_op *make_op_binary_bitwise_rshift(struct ir_op *left, struct ir_op *right,
+ enum ir_side side)
+{
+ return make_op_binary_bitwise(AST_OP_BIT_RSHIFT, ">>", left, right, side);
+}
+
+static
+struct ir_op *make_op_binary_bitwise_lshift(struct ir_op *left, struct ir_op *right,
+ enum ir_side side)
+{
+ return make_op_binary_bitwise(AST_OP_BIT_LSHIFT, "<<", left, right, side);
+}
+
+static
+struct ir_op *make_op_binary_bitwise_and(struct ir_op *left, struct ir_op *right,
+ enum ir_side side)
+{
+ return make_op_binary_bitwise(AST_OP_BIT_AND, "&", left, right, side);
+}
+
+static
+struct ir_op *make_op_binary_bitwise_or(struct ir_op *left, struct ir_op *right,
+ enum ir_side side)
+{
+ return make_op_binary_bitwise(AST_OP_BIT_OR, "|", left, right, side);
+}
+
+static
+struct ir_op *make_op_binary_bitwise_xor(struct ir_op *left, struct ir_op *right,
+ enum ir_side side)
+{
+ return make_op_binary_bitwise(AST_OP_BIT_XOR, "^", left, right, side);
+}
+
static
void filter_free_ir_recursive(struct ir_op *op)
{
case IR_OP_LOAD:
switch (op->data_type) {
case IR_DATA_STRING:
- free(op->u.load.u.string);
+ free(op->u.load.u.string.value);
break;
case IR_DATA_FIELD_REF: /* fall-through */
case IR_DATA_GET_CONTEXT_REF:
free(op->u.load.u.ref);
break;
+ case IR_DATA_EXPRESSION:
+ free_load_expression(op->u.load.u.expression);
default:
break;
}
return make_op_load_float(node->u.expression.u.float_constant,
side);
case AST_EXP_IDENTIFIER:
- if (node->u.expression.pre_op != AST_LINK_UNKNOWN) {
- fprintf(stderr, "[error] %s: dotted and dereferenced identifiers not supported\n", __func__);
- return NULL;
- }
- return make_op_load_field_ref(node->u.expression.u.identifier,
- side);
case AST_EXP_GLOBAL_IDENTIFIER:
- {
- struct filter_node *next;
-
- if (node->u.expression.pre_op == AST_LINK_UNKNOWN) {
- fprintf(stderr, "[error] %s: global identifiers need chained identifier \n", __func__);
- return NULL;
- }
- /* We currently only support $ctx (context) identifiers */
- if (strncmp(node->u.expression.u.identifier,
- "$ctx", strlen("$ctx")) != 0) {
- fprintf(stderr, "[error] %s: \"%s\" global identifier is unknown. Only \"$ctx\" currently implemented.\n", __func__, node->u.expression.u.identifier);
- return NULL;
- }
- next = node->u.expression.next;
- if (!next) {
- fprintf(stderr, "[error] %s: Expecting a context name, e.g. \'$ctx.name\'.\n", __func__);
- return NULL;
- }
- if (next->type != NODE_EXPRESSION) {
- fprintf(stderr, "[error] %s: Expecting expression.\n", __func__);
- return NULL;
- }
- if (next->u.expression.type != AST_EXP_IDENTIFIER) {
- fprintf(stderr, "[error] %s: Expecting identifier.\n", __func__);
- return NULL;
- }
- if (next->u.expression.pre_op != AST_LINK_UNKNOWN) {
- fprintf(stderr, "[error] %s: dotted and dereferenced identifiers not supported after identifier\n", __func__);
- return NULL;
- }
- return make_op_load_get_context_ref(next->u.expression.u.identifier,
- side);
- }
+ return make_op_load_expression(node, side);
case AST_EXP_NESTED:
return generate_ir_recursive(ctx, node->u.expression.u.child,
side);
return NULL;
/*
- * Binary operators other than comparators and logical and/or
- * are not supported. If we ever want to support those, we will
- * need a stack for the general case rather than just 2
- * registers (see bytecode).
+ * The following binary operators other than comparators and
+ * logical and/or are not supported yet.
*/
case AST_OP_MUL:
op_str = "*";
case AST_OP_MINUS:
op_str = "-";
goto error_not_supported;
- case AST_OP_RSHIFT:
- op_str = ">>";
- goto error_not_supported;
- case AST_OP_LSHIFT:
- op_str = "<<";
- goto error_not_supported;
- case AST_OP_BIN_AND:
- op_str = "&";
- goto error_not_supported;
- case AST_OP_BIN_OR:
- op_str = "|";
- goto error_not_supported;
- case AST_OP_BIN_XOR:
- op_str = "^";
- goto error_not_supported;
+
+ case AST_OP_BIT_RSHIFT:
+ case AST_OP_BIT_LSHIFT:
+ case AST_OP_BIT_AND:
+ case AST_OP_BIT_OR:
+ case AST_OP_BIT_XOR:
+ lchild = generate_ir_recursive(ctx, node->u.op.lchild, IR_LEFT);
+ if (!lchild)
+ return NULL;
+ rchild = generate_ir_recursive(ctx, node->u.op.rchild, IR_RIGHT);
+ if (!rchild) {
+ filter_free_ir_recursive(lchild);
+ return NULL;
+ }
+ break;
case AST_OP_EQ:
case AST_OP_NE:
case AST_OP_LE:
op = make_op_binary_le(lchild, rchild, side);
break;
+ case AST_OP_BIT_RSHIFT:
+ op = make_op_binary_bitwise_rshift(lchild, rchild, side);
+ break;
+ case AST_OP_BIT_LSHIFT:
+ op = make_op_binary_bitwise_lshift(lchild, rchild, side);
+ break;
+ case AST_OP_BIT_AND:
+ op = make_op_binary_bitwise_and(lchild, rchild, side);
+ break;
+ case AST_OP_BIT_OR:
+ op = make_op_binary_bitwise_or(lchild, rchild, side);
+ break;
+ case AST_OP_BIT_XOR:
+ op = make_op_binary_bitwise_xor(lchild, rchild, side);
+ break;
default:
break;
}
struct ir_op *make_unary_op(struct filter_parser_ctx *ctx,
struct filter_node *node, enum ir_side side)
{
- const char *op_str = "?";
-
switch (node->u.unary_op.type) {
case AST_UNARY_UNKNOWN:
default:
}
return op;
}
- case AST_UNARY_BIN_NOT:
+ case AST_UNARY_BIT_NOT:
{
- op_str = "~";
- goto error_not_supported;
+ struct ir_op *op, *child;
+
+ child = generate_ir_recursive(ctx, node->u.unary_op.child,
+ side);
+ if (!child)
+ return NULL;
+ op = make_op_unary_bit_not(child, side);
+ if (!op) {
+ filter_free_ir_recursive(child);
+ return NULL;
+ }
+ return op;
}
}
-error_not_supported:
- fprintf(stderr, "[error] %s: unary operation '%s' not supported\n",
- __func__, op_str);
return NULL;
}
projects / lttng-tools.git / blobdiff