case IR_DATA_NUMERIC:
case IR_DATA_FIELD_REF:
case IR_DATA_GET_CONTEXT_REF:
+ case IR_DATA_EXPRESSION:
/* ok */
break;
}
}
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)
- 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) {
- goto error;
- }
- return op;
+ if (!load_expression)
+ return;
+ exp_op = load_expression->child;
+ for (;;) {
+ struct ir_load_expression_op *prev_exp_op;
-error:
- free(op);
- return NULL;
+ 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 ir_op *make_op_load_field_ref_index(char *string,
- struct filter_node *next,
- enum ir_side side)
+struct filter_node *load_expression_get_forward_chain(struct filter_node *node)
{
- struct ir_op *op;
+ struct filter_node *prev_node;
- op = calloc(sizeof(struct ir_op), 1);
- if (!op)
- return NULL;
- op->op = IR_OP_LOAD;
- op->data_type = IR_DATA_FIELD_REF_INDEX;
- op->signedness = IR_SIGN_DYN;
- op->side = side;
- op->u.load.u.ref_index.symbol = strdup(string);
- if (!op->u.load.u.ref_index.symbol) {
- goto error;
- }
- /* Only positive integer literals accepted as index. */
- if (next->type == NODE_UNARY_OP) {
- fprintf(stderr, "[error] Unexpected unary operator as index\n");
- goto error;
- }
- if (next->type != NODE_EXPRESSION) {
- fprintf(stderr, "[error] Expecting expression as index\n");
- goto error;
- }
- if (next->u.expression.type != AST_EXP_CONSTANT) {
- fprintf(stderr, "[error] Expecting constant index\n");
- goto error;
- }
- if (next->u.expression.u.constant < 0) {
- fprintf(stderr, "[error] Expecting positive constant index\n");
- goto error;
+ for (;;) {
+ assert(node->type == NODE_EXPRESSION);
+ prev_node = node;
+ node = node->u.expression.prev;
+ if (!node) {
+ break;
+ }
+ node->u.expression.next = prev_node;
}
- op->u.load.u.ref_index.index = next->u.expression.u.constant;
- return op;
-
-error:
- free(op);
- return NULL;
+ return prev_node;
}
static
-struct ir_op *make_op_load_get_context_ref(char *string,
- enum ir_side side)
+struct ir_load_expression *create_load_expression(struct filter_node *node)
{
- struct ir_op *op;
+ struct ir_load_expression *load_exp;
+ struct ir_load_expression_op *load_exp_op, *prev_op;
+ char *str;
- op = calloc(sizeof(struct ir_op), 1);
- if (!op)
+ /* Get forward chain. */
+ node = load_expression_get_forward_chain(node);
+ if (!node)
return NULL;
- op->op = IR_OP_LOAD;
- op->data_type = IR_DATA_GET_CONTEXT_REF;
- op->signedness = IR_SIGN_DYN;
- op->side = side;
- op->u.load.u.ref = strdup(string);
- if (!op->u.load.u.ref) {
+ 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;
+ }
+
+ 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;
}
- return op;
+ /* 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(op);
+ free_load_expression(load_exp);
return NULL;
}
static
-struct ir_op *make_op_load_get_context_ref_index(char *string,
- struct filter_node *next,
+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_INDEX;
+ op->data_type = IR_DATA_EXPRESSION;
op->signedness = IR_SIGN_DYN;
op->side = side;
- op->u.load.u.ref_index.symbol = strdup(string);
- if (!op->u.load.u.ref_index.symbol) {
- goto error;
- }
- /* Only positive integer literals accepted as offset. */
- if (next->type == NODE_UNARY_OP) {
- fprintf(stderr, "[error] Unexpected unary operator as index\n");
- goto error;
- }
- if (next->type != NODE_EXPRESSION) {
- fprintf(stderr, "[error] Expecting expression as index\n");
- goto error;
- }
- if (next->u.expression.type != AST_EXP_CONSTANT) {
- fprintf(stderr, "[error] Expecting constant index\n");
- goto error;
- }
- if (next->u.expression.u.constant < 0) {
- fprintf(stderr, "[error] Expecting positive constant index\n");
+ op->u.load.u.expression = create_load_expression(node);
+ if (!op->u.load.u.expression) {
goto error;
}
- op->u.load.u.ref_index.index = next->u.expression.u.constant;
return op;
error:
+ free_load_expression(op->u.load.u.expression);
free(op);
return NULL;
}
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_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_DATA_GET_CONTEXT_REF:
free(op->u.load.u.ref);
break;
- case IR_DATA_FIELD_REF_INDEX: /* fall-through */
- case IR_DATA_GET_CONTEXT_REF_INDEX:
- free(op->u.load.u.ref_index.symbol);
- 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:
- switch (node->u.expression.pre_op) {
- case AST_LINK_UNKNOWN:
- return make_op_load_field_ref(node->u.expression.u.identifier,
- side);
- case AST_LINK_BRACKET:
- return make_op_load_field_ref_index(node->u.expression.u.identifier,
- node->u.expression.next,
- side);
- default:
- fprintf(stderr, "[error] %s: dotted and dereferenced identifiers not supported\n", __func__);
- return NULL;
- }
case AST_EXP_GLOBAL_IDENTIFIER:
- {
- const char *name;
-
- /*
- * We currently only support $ctx (context) and $app
- * identifiers.
- */
- if (strncmp(node->u.expression.u.identifier,
- "$ctx.", strlen("$ctx.")) != 0
- && strncmp(node->u.expression.u.identifier,
- "$app.", strlen("$app.")) != 0) {
- fprintf(stderr, "[error] %s: \"%s\" global identifier is unknown. Only \"$ctx\" and \"$app\" are currently implemented.\n", __func__, node->u.expression.u.identifier);
- return NULL;
- }
- name = strchr(node->u.expression.u.identifier, '.');
- if (!name) {
- fprintf(stderr, "[error] %s: Expecting '.'\n", __func__);
- return NULL;
- }
- name++; /* Skip . */
- if (!strlen(name)) {
- fprintf(stderr, "[error] %s: Expecting a context name, e.g. \'$ctx.name\'.\n", __func__);
- return NULL;
- }
- switch (node->u.expression.pre_op) {
- case AST_LINK_UNKNOWN:
- return make_op_load_get_context_ref(node->u.expression.u.identifier,
- side);
- case AST_LINK_BRACKET:
- return make_op_load_get_context_ref_index(node->u.expression.u.identifier,
- node->u.expression.next,
- side);
- default:
- fprintf(stderr, "[error] %s: dotted and dereferenced identifiers not supported\n", __func__);
- return NULL;
- }
-
- }
+ 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_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_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_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;
}
}
return op;
}
- case AST_UNARY_BIN_NOT:
+ case AST_UNARY_BIT_NOT:
{
op_str = "~";
goto error_not_supported;
projects / lttng-tools.git / blobdiff