/*
* Binary comparators use top of stack and top of stack -1.
*/
static
int bin_op_compare_check(struct vstack *stack, const char *str)
{
if (unlikely(!vstack_ax(stack) || !vstack_bx(stack)))
goto error_unknown;
switch (vstack_ax(stack)->type) {
default:
case REG_DOUBLE:
goto error_unknown;
case REG_STRING:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_unknown;
case REG_STRING:
break;
case REG_S64:
goto error_mismatch;
}
break;
case REG_S64:
switch (vstack_bx(stack)->type) {
default:
case REG_DOUBLE:
goto error_unknown;
case REG_STRING:
goto error_mismatch;
case REG_S64:
break;
}
break;
}
return 0;
error_unknown:
return -EINVAL;
error_mismatch:
printk(KERN_WARNING "type mismatch for '%s' binary operator\n", str);
return -EINVAL;
}
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;
}