#include <stdio.h>
#include <helper.h>
#include <lttng/ust-events.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+#include <inttypes.h>
+#include <limits.h>
+#include "filter-bytecode.h"
+
+#define NR_REG 2
+
+#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] " fmt, ## args)
+#else
+#define dbg_printf(fmt, args...) \
+do { \
+ /* do nothing but check printf format */ \
+ if (0) \
+ printf("[debug bytecode] " fmt, ## args); \
+} while (0)
+#endif
+
+/* Linked bytecode */
+struct bytecode_runtime {
+ uint16_t len;
+ char data[0];
+};
+
+struct reg {
+ enum {
+ REG_S64,
+ REG_STRING, /* NULL-terminated string */
+ REG_SEQUENCE, /* non-null terminated */
+ } type;
+ int64_t v;
+
+ const char *str;
+ size_t seq_len;
+ int literal; /* is string literal ? */
+};
+
+static const char *opnames[] = {
+ [ FILTER_OP_UNKNOWN ] = "UNKNOWN",
+
+ [ FILTER_OP_RETURN ] = "RETURN",
+
+ /* binary */
+ [ FILTER_OP_MUL ] = "MUL",
+ [ FILTER_OP_DIV ] = "DIV",
+ [ FILTER_OP_MOD ] = "MOD",
+ [ FILTER_OP_PLUS ] = "PLUS",
+ [ FILTER_OP_MINUS ] = "MINUS",
+ [ FILTER_OP_RSHIFT ] = "RSHIFT",
+ [ FILTER_OP_LSHIFT ] = "LSHIFT",
+ [ FILTER_OP_BIN_AND ] = "BIN_AND",
+ [ FILTER_OP_BIN_OR ] = "BIN_OR",
+ [ FILTER_OP_BIN_XOR ] = "BIN_XOR",
+ [ FILTER_OP_EQ ] = "EQ",
+ [ FILTER_OP_NE ] = "NE",
+ [ FILTER_OP_GT ] = "GT",
+ [ FILTER_OP_LT ] = "LT",
+ [ FILTER_OP_GE ] = "GE",
+ [ FILTER_OP_LE ] = "LE",
+
+ /* unary */
+ [ FILTER_OP_UNARY_PLUS ] = "UNARY_PLUS",
+ [ FILTER_OP_UNARY_MINUS ] = "UNARY_MINUS",
+ [ FILTER_OP_UNARY_NOT ] = "UNARY_NOT",
+
+ /* logical */
+ [ FILTER_OP_AND ] = "AND",
+ [ FILTER_OP_OR ] = "OR",
+
+ /* load */
+ [ FILTER_OP_LOAD_FIELD_REF ] = "LOAD_FIELD_REF",
+ [ FILTER_OP_LOAD_STRING ] = "LOAD_STRING",
+ [ FILTER_OP_LOAD_S64 ] = "LOAD_S64",
+};
+
+static
+const char *print_op(enum filter_op op)
+{
+ if (op >= NR_FILTER_OPS)
+ return "UNKNOWN";
+ else
+ return opnames[op];
+}
+
+/*
+ * -1: wildcard found.
+ * -2: unknown escape char.
+ * 0: normal char.
+ */
+
+static
+int parse_char(const char **p)
+{
+ switch (**p) {
+ case '\\':
+ (*p)++;
+ switch (**p) {
+ case '\\':
+ case '*':
+ return 0;
+ default:
+ return -2;
+ }
+ case '*':
+ return -1;
+ default:
+ return 0;
+ }
+}
+
+static
+int reg_strcmp(struct reg reg[NR_REG], const char *cmp_type)
+{
+ const char *p = reg[REG_R0].str, *q = reg[REG_R1].str;
+ int ret;
+ int diff;
+
+ for (;;) {
+ int escaped_r0 = 0;
+
+ if (unlikely(p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')) {
+ if (q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')
+ diff = 0;
+ else
+ diff = -1;
+ break;
+ }
+ if (unlikely(q - reg[REG_R1].str > reg[REG_R1].seq_len || *q == '\0')) {
+ if (p - reg[REG_R0].str > reg[REG_R0].seq_len || *p == '\0')
+ diff = 0;
+ else
+ diff = 1;
+ break;
+ }
+ if (reg[REG_R0].literal) {
+ ret = parse_char(&p);
+ if (ret == -1) {
+ return 0;
+ } else if (ret == -2) {
+ escaped_r0 = 1;
+ }
+ /* else compare both char */
+ }
+ if (reg[REG_R1].literal) {
+ ret = parse_char(&q);
+ if (ret == -1) {
+ return 0;
+ } else if (ret == -2) {
+ if (!escaped_r0)
+ return -1;
+ } else {
+ if (escaped_r0)
+ return 1;
+ }
+ } else {
+ if (escaped_r0)
+ return 1;
+ }
+ diff = *p - *q;
+ if (diff != 0)
+ break;
+ p++;
+ q++;
+ }
+ return diff;
+}
+
+static
+int lttng_filter_false(void *filter_data,
+ const char *filter_stack_data)
+{
+ return 0;
+}
static
int lttng_filter_interpret_bytecode(void *filter_data,
const char *filter_stack_data)
{
- /* TODO */
+ struct bytecode_runtime *bytecode = filter_data;
+ void *pc, *next_pc, *start_pc;
+ int ret = -EINVAL;
+ int retval = 0;
+ struct reg reg[NR_REG];
+ int i;
+
+ for (i = 0; i < NR_REG; i++) {
+ reg[i].type = REG_S64;
+ reg[i].v = 0;
+ reg[i].str = NULL;
+ reg[i].seq_len = 0;
+ reg[i].literal = 0;
+ }
+
+ start_pc = &bytecode->data[0];
+ for (pc = next_pc = start_pc; pc - start_pc < bytecode->len;
+ pc = next_pc) {
+ if (unlikely(pc >= start_pc + bytecode->len)) {
+ fprintf(stderr, "[error] filter bytecode overflow\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ dbg_printf("Executing op %s (%u)\n",
+ print_op((unsigned int) *(filter_opcode_t *) pc),
+ (unsigned int) *(filter_opcode_t *) pc);
+ switch (*(filter_opcode_t *) pc) {
+ case FILTER_OP_UNKNOWN:
+ default:
+ fprintf(stderr, "[error] unknown bytecode op %u\n",
+ (unsigned int) *(filter_opcode_t *) pc);
+ ret = -EINVAL;
+ goto end;
+
+ case FILTER_OP_RETURN:
+ retval = !!reg[0].v;
+ 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:
+ fprintf(stderr, "[error] unsupported bytecode op %u\n",
+ (unsigned int) *(filter_opcode_t *) pc);
+ ret = -EINVAL;
+ goto end;
+
+ case FILTER_OP_EQ:
+ {
+ if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
+ || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
+ fprintf(stderr, "[error] type mismatch for '==' binary operator\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (reg[REG_R0].type) {
+ default:
+ fprintf(stderr, "[error] unknown register type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case REG_STRING:
+ case REG_SEQUENCE:
+ reg[REG_R0].v = (reg_strcmp(reg, "==") == 0);
+ break;
+ case REG_S64:
+ reg[REG_R0].v = (reg[REG_R0].v == reg[REG_R1].v);
+ break;
+ }
+ reg[REG_R0].type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+ case FILTER_OP_NE:
+ {
+ if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
+ || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
+ fprintf(stderr, "[error] type mismatch for '!=' binary operator\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (reg[REG_R0].type) {
+ default:
+ fprintf(stderr, "[error] unknown register type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case REG_STRING:
+ case REG_SEQUENCE:
+ reg[REG_R0].v = (reg_strcmp(reg, "!=") != 0);
+ break;
+ case REG_S64:
+ reg[REG_R0].v = (reg[REG_R0].v != reg[REG_R1].v);
+ break;
+ }
+ reg[REG_R0].type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+ case FILTER_OP_GT:
+ {
+ if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
+ || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
+ fprintf(stderr, "[error] type mismatch for '>' binary operator\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (reg[REG_R0].type) {
+ default:
+ fprintf(stderr, "[error] unknown register type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case REG_STRING:
+ case REG_SEQUENCE:
+ reg[REG_R0].v = (reg_strcmp(reg, ">") > 0);
+ break;
+ case REG_S64:
+ reg[REG_R0].v = (reg[REG_R0].v > reg[REG_R1].v);
+ break;
+ }
+ reg[REG_R0].type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+ case FILTER_OP_LT:
+ {
+ if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
+ || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
+ fprintf(stderr, "[error] type mismatch for '<' binary operator\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (reg[REG_R0].type) {
+ default:
+ fprintf(stderr, "[error] unknown register type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case REG_STRING:
+ case REG_SEQUENCE:
+ reg[REG_R0].v = (reg_strcmp(reg, "<") < 0);
+ break;
+ case REG_S64:
+ reg[REG_R0].v = (reg[REG_R0].v < reg[REG_R1].v);
+ break;
+ }
+ reg[REG_R0].type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+ case FILTER_OP_GE:
+ {
+ if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
+ || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
+ fprintf(stderr, "[error] type mismatch for '>=' binary operator\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (reg[REG_R0].type) {
+ default:
+ fprintf(stderr, "[error] unknown register type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case REG_STRING:
+ case REG_SEQUENCE:
+ reg[REG_R0].v = (reg_strcmp(reg, ">=") >= 0);
+ break;
+ case REG_S64:
+ reg[REG_R0].v = (reg[REG_R0].v >= reg[REG_R1].v);
+ break;
+ }
+ reg[REG_R0].type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+ case FILTER_OP_LE:
+ {
+ if (unlikely((reg[REG_R0].type == REG_S64 && reg[REG_R1].type != REG_S64)
+ || (reg[REG_R0].type != REG_S64 && reg[REG_R1].type == REG_S64))) {
+ fprintf(stderr, "[error] type mismatch for '<=' binary operator\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (reg[REG_R0].type) {
+ default:
+ fprintf(stderr, "[error] unknown register type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case REG_STRING:
+ case REG_SEQUENCE:
+ reg[REG_R0].v = (reg_strcmp(reg, "<=") <= 0);
+ break;
+ case REG_S64:
+ reg[REG_R0].v = (reg[REG_R0].v <= reg[REG_R1].v);
+ break;
+ }
+ reg[REG_R0].type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+
+ /* unary */
+ case FILTER_OP_UNARY_PLUS:
+ {
+ struct unary_op *insn = (struct unary_op *) pc;
+
+ if (unlikely(insn->reg >= REG_ERROR)) {
+ fprintf(stderr, "[error] invalid register %u\n",
+ (unsigned int) insn->reg);
+ ret = -EINVAL;
+ goto end;
+ }
+ if (unlikely(reg[insn->reg].type != REG_S64)) {
+ fprintf(stderr, "[error] Unary plus can only be applied to numeric register\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+ case FILTER_OP_UNARY_MINUS:
+ {
+ struct unary_op *insn = (struct unary_op *) pc;
+
+ if (unlikely(insn->reg >= REG_ERROR)) {
+ fprintf(stderr, "[error] invalid register %u\n",
+ (unsigned int) insn->reg);
+ ret = -EINVAL;
+ goto end;
+ }
+ if (unlikely(reg[insn->reg].type != REG_S64)) {
+ fprintf(stderr, "[error] Unary minus can only be applied to numeric register\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ reg[insn->reg].v = -reg[insn->reg].v;
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+ case FILTER_OP_UNARY_NOT:
+ {
+ struct unary_op *insn = (struct unary_op *) pc;
+
+ if (unlikely(insn->reg >= REG_ERROR)) {
+ fprintf(stderr, "[error] invalid register %u\n",
+ (unsigned int) insn->reg);
+ ret = -EINVAL;
+ goto end;
+ }
+ if (unlikely(reg[insn->reg].type != REG_S64)) {
+ fprintf(stderr, "[error] Unary not can only be applied to numeric register\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ reg[insn->reg].v = !reg[insn->reg].v;
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+ /* logical */
+ case FILTER_OP_AND:
+ {
+ struct logical_op *insn = (struct logical_op *) pc;
+
+ if (unlikely(reg[REG_R0].type != REG_S64)) {
+ fprintf(stderr, "[error] Logical operator 'and' can only be applied to numeric register\n");
+ ret = -EINVAL;
+ goto end;
+ }
+
+ /* If REG_R0 is 0, skip and evaluate to 0 */
+ if (reg[REG_R0].v == 0) {
+ dbg_printf("Jumping to bytecode offset %u\n",
+ (unsigned int) insn->skip_offset);
+ next_pc = start_pc + insn->skip_offset;
+ if (unlikely(next_pc <= pc)) {
+ fprintf(stderr, "[error] Loops are not allowed in bytecode\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ } else {
+ next_pc += sizeof(struct logical_op);
+ }
+ break;
+ }
+ case FILTER_OP_OR:
+ {
+ struct logical_op *insn = (struct logical_op *) pc;
+
+ if (unlikely(reg[REG_R0].type != REG_S64)) {
+ fprintf(stderr, "[error] Logical operator 'and' can only be applied to numeric register\n");
+ ret = -EINVAL;
+ goto end;
+ }
+
+ /* If REG_R0 is nonzero, skip and evaluate to 1 */
+ if (reg[REG_R0].v != 0) {
+ reg[REG_R0].v = 1;
+ dbg_printf("Jumping to bytecode offset %u\n",
+ (unsigned int) insn->skip_offset);
+ next_pc = start_pc + insn->skip_offset;
+ if (unlikely(next_pc <= pc)) {
+ fprintf(stderr, "[error] Loops are not allowed in bytecode\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ } else {
+ next_pc += sizeof(struct logical_op);
+ }
+ break;
+ }
+
+ /* load */
+ case FILTER_OP_LOAD_FIELD_REF:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct field_ref *ref = (struct field_ref *) insn->data;
+
+ if (unlikely(insn->reg >= REG_ERROR)) {
+ fprintf(stderr, "[error] invalid register %u\n",
+ (unsigned int) insn->reg);
+ ret = -EINVAL;
+ goto end;
+ }
+ dbg_printf("load field ref offset %u type %u\n",
+ ref->offset, ref->type);
+ switch (ref->type) {
+ case FIELD_REF_UNKNOWN:
+ default:
+ fprintf(stderr, "[error] unknown field ref type\n");
+ ret = -EINVAL;
+ goto end;
+
+ case FIELD_REF_STRING:
+ reg[insn->reg].str =
+ *(const char * const *) &filter_stack_data[ref->offset];
+ reg[insn->reg].type = REG_STRING;
+ reg[insn->reg].seq_len = UINT_MAX;
+ reg[insn->reg].literal = 0;
+ dbg_printf("ref load string %s\n", reg[insn->reg].str);
+ break;
+ case FIELD_REF_SEQUENCE:
+ reg[insn->reg].seq_len =
+ *(unsigned long *) &filter_stack_data[ref->offset];
+ reg[insn->reg].str =
+ *(const char **) (&filter_stack_data[ref->offset
+ + sizeof(unsigned long)]);
+ reg[insn->reg].type = REG_SEQUENCE;
+ reg[insn->reg].literal = 0;
+ break;
+ case FIELD_REF_S64:
+ memcpy(®[insn->reg].v, &filter_stack_data[ref->offset],
+ sizeof(struct literal_numeric));
+ reg[insn->reg].type = REG_S64;
+ reg[insn->reg].literal = 0;
+ dbg_printf("ref load s64 %" PRIi64 "\n", reg[insn->reg].v);
+ break;
+ }
+
+ next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
+ break;
+ }
+
+ case FILTER_OP_LOAD_STRING:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+
+ if (unlikely(insn->reg >= REG_ERROR)) {
+ fprintf(stderr, "[error] invalid register %u\n",
+ (unsigned int) insn->reg);
+ ret = -EINVAL;
+ goto end;
+ }
+ dbg_printf("load string %s\n", insn->data);
+ reg[insn->reg].str = insn->data;
+ reg[insn->reg].type = REG_STRING;
+ reg[insn->reg].seq_len = UINT_MAX;
+ reg[insn->reg].literal = 1;
+ next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
+ break;
+ }
+
+ case FILTER_OP_LOAD_S64:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+
+ if (unlikely(insn->reg >= REG_ERROR)) {
+ fprintf(stderr, "[error] invalid register %u\n",
+ (unsigned int) insn->reg);
+ ret = -EINVAL;
+ goto end;
+ }
+ memcpy(®[insn->reg].v, insn->data,
+ sizeof(struct literal_numeric));
+ dbg_printf("load s64 %" PRIi64 "\n", reg[insn->reg].v);
+ reg[insn->reg].type = REG_S64;
+ next_pc += sizeof(struct load_op)
+ + sizeof(struct literal_numeric);
+ break;
+ }
+ }
+ }
+end:
+ /* return 0 (discard) on error */
+ if (ret)
+ return 0;
+ return retval;
+}
+
+static
+int apply_field_reloc(struct ltt_event *event,
+ struct bytecode_runtime *runtime,
+ uint32_t runtime_len,
+ uint32_t reloc_offset,
+ const char *field_name)
+{
+ const struct lttng_event_desc *desc;
+ const struct lttng_event_field *fields, *field = NULL;
+ unsigned int nr_fields, i;
+ struct field_ref *field_ref;
+ uint32_t field_offset = 0;
+
+ fprintf(stderr, "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;
+
+ /* Lookup event by name */
+ desc = event->desc;
+ if (!desc)
+ return -EINVAL;
+ fields = desc->fields;
+ if (!fields)
+ return -EINVAL;
+ nr_fields = desc->nr_fields;
+ for (i = 0; i < nr_fields; i++) {
+ if (!strcmp(fields[i].name, field_name)) {
+ field = &fields[i];
+ break;
+ }
+ /* compute field offset */
+ switch (fields[i].type.atype) {
+ case atype_integer:
+ case atype_enum:
+ field_offset += sizeof(int64_t);
+ break;
+ case atype_array:
+ case atype_sequence:
+ field_offset += sizeof(unsigned long);
+ field_offset += sizeof(void *);
+ break;
+ case atype_string:
+ field_offset += sizeof(void *);
+ break;
+ case atype_float:
+ field_offset += sizeof(double);
+ default:
+ return -EINVAL;
+ }
+ }
+ if (!field)
+ return -EINVAL;
+
+ /* Check if field offset is too large for 16-bit offset */
+ if (field_offset > FILTER_BYTECODE_MAX_LEN)
+ return -EINVAL;
+
+ /* set type */
+ field_ref = (struct field_ref *) &runtime->data[reloc_offset];
+ switch (field->type.atype) {
+ case atype_integer:
+ case atype_enum:
+ field_ref->type = FIELD_REF_S64;
+ field_ref->type = FIELD_REF_S64;
+ break;
+ case atype_array:
+ case atype_sequence:
+ field_ref->type = FIELD_REF_SEQUENCE;
+ break;
+ case atype_string:
+ field_ref->type = FIELD_REF_STRING;
+ break;
+ case atype_float:
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+ /* set offset */
+ field_ref->offset = (uint16_t) field_offset;
return 0;
}
+/*
+ * Take a bytecode with reloc table and link it to an event to create a
+ * bytecode runtime.
+ */
static
int _lttng_filter_event_link_bytecode(struct ltt_event *event,
struct lttng_ust_filter_bytecode *filter_bytecode)
{
+ int ret, offset, next_offset;
+ struct bytecode_runtime *runtime = NULL;
+ size_t runtime_alloc_len;
+
if (!filter_bytecode)
return 0;
+ /* Even is not connected to any description */
+ if (!event->desc)
+ return 0;
+ /* Bytecode already linked */
+ if (event->filter || event->filter_data)
+ return 0;
+ fprintf(stderr, "Linking\n");
+
+ /* We don't need the reloc table in the runtime */
+ runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset;
+ runtime = zmalloc(runtime_alloc_len);
+ if (!runtime) {
+ ret = -ENOMEM;
+ goto link_error;
+ }
+ runtime->len = filter_bytecode->reloc_offset;
+ /* copy original bytecode */
+ memcpy(runtime->data, filter_bytecode->data, runtime->len);
+ /*
+ * apply relocs. Those are a uint16_t (offset in bytecode)
+ * followed by a string (field name).
+ */
+ fprintf(stderr, "iter for %d %d\n", filter_bytecode->reloc_offset, filter_bytecode->len);
+ for (offset = filter_bytecode->reloc_offset;
+ offset < filter_bytecode->len;
+ offset = next_offset) {
+ uint16_t reloc_offset =
+ *(uint16_t *) &filter_bytecode->data[offset];
+ const char *field_name =
+ (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)];
+
+ ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
+ if (ret) {
+ goto link_error;
+ }
+ next_offset = offset + sizeof(uint16_t) + strlen(field_name) + 1;
+ }
+ event->filter_data = runtime;
event->filter = lttng_filter_interpret_bytecode;
- /* TODO */
- /* event->filter_data = ; */
return 0;
+
+link_error:
+ event->filter = lttng_filter_false;
+ free(runtime);
+ return ret;
}
void lttng_filter_event_link_bytecode(struct ltt_event *event,
{
int ret;
- ret = _lttng_filter_event_link_bytecode(event, event->filter_bytecode);
+ ret = _lttng_filter_event_link_bytecode(event, filter_bytecode);
if (ret) {
fprintf(stderr, "[lttng filter] error linking event bytecode\n");
}
/*
* Need to attach filter to an event before starting tracing for the
- * session.
+ * 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 *filter_bytecode)
{
- struct lttng_ust_filter_bytecode *bc;
-
if (event->chan->session->been_active)
return -EPERM;
if (event->filter_bytecode)
return -EEXIST;
-
- bc = zmalloc(sizeof(struct lttng_ust_filter_bytecode)
- + filter_bytecode->len);
- if (!bc)
- return -ENOMEM;
- event->filter_bytecode = bc;
+ event->filter_bytecode = filter_bytecode;
return 0;
}
/*
* Need to attach filter to a wildcard before starting tracing for the
- * session.
+ * session. We own the filter_bytecode if we return success.
*/
int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard,
struct lttng_ust_filter_bytecode *filter_bytecode)
{
- struct lttng_ust_filter_bytecode *bc;
-
if (wildcard->chan->session->been_active)
return -EPERM;
if (wildcard->filter_bytecode)
return -EEXIST;
-
- bc = zmalloc(sizeof(struct lttng_ust_filter_bytecode)
- + filter_bytecode->len);
- if (!bc)
- return -ENOMEM;
- wildcard->filter_bytecode = bc;
+ wildcard->filter_bytecode = filter_bytecode;
return 0;
}
projects / lttng-ust.git / commitdiff
