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zend_jit_trace.c
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/*
+----------------------------------------------------------------------+
| Zend JIT |
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
static zend_op_array dummy_op_array;
static zend_jit_trace_info *zend_jit_traces = NULL;
static const void **zend_jit_exit_groups = NULL;
#define ZEND_JIT_COUNTER_NUM zend_jit_traces[0].root
#define ZEND_JIT_TRACE_NUM zend_jit_traces[0].id
#define ZEND_JIT_EXIT_NUM zend_jit_traces[0].exit_count
#define ZEND_JIT_EXIT_COUNTERS zend_jit_traces[0].exit_counters
#define ZEND_JIT_TRACE_STOP_DESCRIPTION(name, description) \
description,
static const char * zend_jit_trace_stop_description[] = {
ZEND_JIT_TRACE_STOP(ZEND_JIT_TRACE_STOP_DESCRIPTION)
};
static zend_always_inline const char *zend_jit_trace_star_desc(uint8_t trace_flags)
{
if (trace_flags & ZEND_JIT_TRACE_START_LOOP) {
return "loop";
} else if (trace_flags & ZEND_JIT_TRACE_START_ENTER) {
return "enter";
} else if (trace_flags & ZEND_JIT_TRACE_START_RETURN) {
return "return";
} else {
ZEND_UNREACHABLE();
return "???";
}
}
static void zend_jit_trace_startup(bool reattached)
{
if (!reattached) {
zend_jit_traces = (zend_jit_trace_info*)zend_shared_alloc(sizeof(zend_jit_trace_info) * JIT_G(max_root_traces));
if (!zend_jit_traces) {
zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Could not allocate JIT root traces buffer!");
}
zend_jit_exit_groups = (const void**)zend_shared_alloc(sizeof(void*) * (ZEND_JIT_TRACE_MAX_EXITS/ZEND_JIT_EXIT_POINTS_PER_GROUP));
if (!zend_jit_exit_groups) {
zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Could not allocate JIT exit groups buffer!");
}
ZEND_JIT_TRACE_NUM = 1;
ZEND_JIT_COUNTER_NUM = 0;
ZEND_JIT_EXIT_NUM = 0;
ZEND_JIT_EXIT_COUNTERS = 0;
ZCSG(jit_traces) = zend_jit_traces;
ZCSG(jit_exit_groups) = zend_jit_exit_groups;
ZCSG(jit_counters_stopped) = false;
} else {
zend_jit_traces = ZCSG(jit_traces);
if (!zend_jit_traces) {
zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Could not obtain JIT traces buffer!");
}
zend_jit_exit_groups = ZCSG(jit_exit_groups);
if (!zend_jit_exit_groups) {
zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Could not obtain JIT exit groups buffer!");
}
}
memset(&dummy_op_array, 0, sizeof(dummy_op_array));
dummy_op_array.fn_flags = ZEND_ACC_DONE_PASS_TWO;
JIT_G(exit_counters) = calloc(JIT_G(max_exit_counters), 1);
if (JIT_G(exit_counters) == NULL) {
zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Could not allocate JIT exit counters buffer!");
}
}
static const void *zend_jit_trace_allocate_exit_point(uint32_t n)
{
const void *group = NULL;
if (UNEXPECTED(n >= ZEND_JIT_TRACE_MAX_EXITS)) {
return NULL;
}
do {
group = zend_jit_trace_allocate_exit_group(ZEND_JIT_EXIT_NUM);
if (!group) {
return NULL;
}
zend_jit_exit_groups[ZEND_JIT_EXIT_NUM / ZEND_JIT_EXIT_POINTS_PER_GROUP] =
group;
ZEND_JIT_EXIT_NUM += ZEND_JIT_EXIT_POINTS_PER_GROUP;
} while (n >= ZEND_JIT_EXIT_NUM);
return (const void*)
((const char*)group +
((n % ZEND_JIT_EXIT_POINTS_PER_GROUP) * ZEND_JIT_EXIT_POINTS_SPACING));
}
static const void *zend_jit_trace_get_exit_addr(uint32_t n)
{
if (UNEXPECTED(n >= ZEND_JIT_EXIT_NUM)) {
return zend_jit_trace_allocate_exit_point(n);
}
return (const void*)
((const char*)zend_jit_exit_groups[n / ZEND_JIT_EXIT_POINTS_PER_GROUP] +
((n % ZEND_JIT_EXIT_POINTS_PER_GROUP) * ZEND_JIT_EXIT_POINTS_SPACING));
}
static uint32_t zend_jit_exit_point_by_addr(const void *addr)
{
uint32_t n = (ZEND_JIT_EXIT_NUM + (ZEND_JIT_EXIT_POINTS_PER_GROUP - 1)) / ZEND_JIT_EXIT_POINTS_PER_GROUP;
uint32_t i;
for (i = 0; i < n; i++) {
if ((char*)addr >= (char*)zend_jit_exit_groups[i]
&& (char*)addr <= (char*)zend_jit_exit_groups[i] + ((ZEND_JIT_EXIT_POINTS_PER_GROUP - 1) * ZEND_JIT_EXIT_POINTS_SPACING)) {
return (i * ZEND_JIT_EXIT_POINTS_PER_GROUP) +
(((char*)addr - (char*)zend_jit_exit_groups[i]) / ZEND_JIT_EXIT_POINTS_SPACING);
}
}
return (uint32_t)-1;
}
static uint32_t zend_jit_trace_get_exit_point(const zend_op *to_opline, uint32_t flags)
{
zend_jit_trace_info *t = &zend_jit_traces[ZEND_JIT_TRACE_NUM];
uint32_t exit_point;
const zend_op_array *op_array;
uint32_t stack_offset = (uint32_t)-1;
uint32_t stack_size;
zend_jit_trace_stack *stack = NULL;
if (delayed_call_chain) {
assert(to_opline != NULL); /* CALL and IP share the same register */
flags |= ZEND_JIT_EXIT_RESTORE_CALL;
}
if (JIT_G(current_frame)) {
op_array = &JIT_G(current_frame)->func->op_array;
stack_size = op_array->last_var + op_array->T;
if (stack_size) {
stack = JIT_G(current_frame)->stack;
do {
if (STACK_TYPE(stack, stack_size-1) != IS_UNKNOWN
|| STACK_MEM_TYPE(stack, stack_size-1) != IS_UNKNOWN
|| STACK_REF(stack, stack_size-1) != IR_UNUSED
) {
break;
}
stack_size--;
} while (stack_size);
}
} else {
op_array = NULL;
stack_size = 0;
}
/* Try to reuse exit points */
if (to_opline != NULL
&& !(flags & ZEND_JIT_EXIT_METHOD_CALL)
&& t->exit_count > 0) {
uint32_t i = t->exit_count;
do {
i--;
if (stack_size == 0
|| (t->exit_info[i].stack_size >= stack_size
&& memcmp(t->stack_map + t->exit_info[i].stack_offset, stack, stack_size * sizeof(zend_jit_trace_stack)) == 0)) {
if (t->exit_info[i].opline == to_opline
&& t->exit_info[i].flags == flags
&& t->exit_info[i].stack_size == stack_size) {
return i;
}
}
} while (i > 0);
}
exit_point = t->exit_count;
if (exit_point < ZEND_JIT_TRACE_MAX_EXITS) {
if (stack_size != 0 && stack_offset == (uint32_t)-1) {
stack_offset = t->stack_map_size;
t->stack_map_size += stack_size;
// TODO: reduce number of reallocations ???
t->stack_map = erealloc(t->stack_map, t->stack_map_size * sizeof(zend_jit_trace_stack));
memcpy(t->stack_map + stack_offset, stack, stack_size * sizeof(zend_jit_trace_stack));
}
t->exit_count++;
t->exit_info[exit_point].opline = to_opline;
t->exit_info[exit_point].op_array = op_array;
t->exit_info[exit_point].flags = flags;
t->exit_info[exit_point].stack_size = stack_size;
t->exit_info[exit_point].stack_offset = stack_offset;
t->exit_info[exit_point].poly_func_ref = 0;
t->exit_info[exit_point].poly_this_ref = 0;
t->exit_info[exit_point].poly_func_reg = ZREG_NONE;
t->exit_info[exit_point].poly_this_reg = ZREG_NONE;
}
return exit_point;
}
static void zend_jit_trace_add_code(const void *start, uint32_t size)
{
zend_jit_trace_info *t = &zend_jit_traces[ZEND_JIT_TRACE_NUM];
t->code_start = start;
t->code_size = size;
}
/**
* Locate a trace in the #zend_jit_traces array with the specified
* #code_start address.
*
* @return the #zend_jit_traces index or 0 if no such #code_start
* address was found
*/
static uint32_t zend_jit_find_trace(const void *addr)
{
uint32_t i;
for (i = 1; i < ZEND_JIT_TRACE_NUM; i++) {
if (zend_jit_traces[i].code_start == addr) {
return i;
}
}
return 0;
}
static zend_string *zend_jit_trace_name(const zend_op_array *op_array, uint32_t lineno)
{
smart_str buf = {0};
smart_str_appends(&buf, TRACE_PREFIX);
smart_str_append_long(&buf, (zend_long)ZEND_JIT_TRACE_NUM);
smart_str_appendc(&buf, '$');
if (op_array->function_name) {
if (op_array->scope) {
smart_str_appendl(&buf, ZSTR_VAL(op_array->scope->name), ZSTR_LEN(op_array->scope->name));
smart_str_appends(&buf, "::");
smart_str_appendl(&buf, ZSTR_VAL(op_array->function_name), ZSTR_LEN(op_array->function_name));
} else {
smart_str_appendl(&buf, ZSTR_VAL(op_array->function_name), ZSTR_LEN(op_array->function_name));
}
} else if (op_array->filename) {
smart_str_appendl(&buf, ZSTR_VAL(op_array->filename), ZSTR_LEN(op_array->filename));
}
smart_str_appendc(&buf, '$');
smart_str_append_long(&buf, (zend_long)lineno);
smart_str_0(&buf);
return buf.s;
}
static int zend_jit_trace_may_exit(const zend_op_array *op_array, const zend_op *opline)
{
switch (opline->opcode) {
case ZEND_IS_IDENTICAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_CASE:
case ZEND_CASE_STRICT:
case ZEND_ISSET_ISEMPTY_CV:
case ZEND_ISSET_ISEMPTY_VAR:
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
case ZEND_ISSET_ISEMPTY_STATIC_PROP:
case ZEND_INSTANCEOF:
case ZEND_TYPE_CHECK:
case ZEND_DEFINED:
case ZEND_IN_ARRAY:
case ZEND_ARRAY_KEY_EXISTS:
if (opline->result_type & (IS_SMART_BRANCH_JMPNZ | IS_SMART_BRANCH_JMPZ)) {
/* smart branch */
return 1;
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_JMP_NULL:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_ASSERT_CHECK:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
/* branch opcodes */
return 1;
case ZEND_NEW:
if (opline->extended_value == 0 && (opline+1)->opcode == ZEND_DO_FCALL) {
/* NEW may skip constructor without arguments */
return 1;
}
break;
case ZEND_CATCH:
case ZEND_FAST_CALL:
case ZEND_FAST_RET:
case ZEND_GENERATOR_CREATE:
case ZEND_GENERATOR_RETURN:
case ZEND_YIELD:
case ZEND_YIELD_FROM:
case ZEND_INCLUDE_OR_EVAL:
case ZEND_MATCH_ERROR:
/* unsupported */
return 1;
case ZEND_DO_FCALL:
/* potentially polymorphic call */
return 1;
#if 0
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
/* monomorphic call */
// TODO: recompilation may change target ???
return 0;
#endif
case ZEND_RETURN_BY_REF:
case ZEND_RETURN:
/* return */
return !JIT_G(current_frame) || TRACE_FRAME_IS_UNKNOWN_RETURN(JIT_G(current_frame));
default:
break;
}
return 0;
}
static zend_always_inline uint32_t zend_jit_trace_type_to_info_ex(uint8_t type, uint32_t info)
{
if (type == IS_UNKNOWN) {
return info;
}
ZEND_ASSERT(info & (1 << type));
if (type < IS_STRING) {
return (1 << type);
} else if (type != IS_ARRAY) {
return (1 << type) | (info & (MAY_BE_RC1|MAY_BE_RCN));
} else {
return MAY_BE_ARRAY | (info & (MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_OF_REF|MAY_BE_ARRAY_KEY_ANY|MAY_BE_RC1|MAY_BE_RCN));
}
}
static zend_always_inline uint32_t zend_jit_trace_type_to_info(uint8_t type)
{
return zend_jit_trace_type_to_info_ex(type, -1);
}
static zend_always_inline zend_ssa_alias_kind zend_jit_var_may_alias(const zend_op_array *op_array, const zend_ssa *ssa, uint32_t var)
{
if (var >= op_array->last_var) {
return NO_ALIAS;
} else if ((!op_array->function_name || (ssa->cfg.flags & ZEND_FUNC_INDIRECT_VAR_ACCESS))) {
return SYMTABLE_ALIAS;
} else if (ssa->vars) {
return ssa->vars[var].alias;
} else if (zend_string_equals_literal(op_array->vars[var], "http_response_header")) {
return HTTP_RESPONSE_HEADER_ALIAS;
}
return NO_ALIAS;
}
static zend_always_inline void zend_jit_trace_add_op_guard(zend_ssa *tssa,
int ssa_var,
uint8_t op_type)
{
zend_ssa_var_info *info = &tssa->var_info[ssa_var];
if ((info->type & (MAY_BE_ANY|MAY_BE_UNDEF)) != (1 << op_type)) {
if (UNEXPECTED(tssa->vars[ssa_var].alias != NO_ALIAS)) {
info->type |= MAY_BE_GUARD;
} else {
info->type = MAY_BE_GUARD | zend_jit_trace_type_to_info_ex(op_type, info->type);
}
}
}
#define ADD_OP_GUARD(_ssa_var, _op_type) do { \
if (_ssa_var >= 0 && _op_type != IS_UNKNOWN) { \
zend_jit_trace_add_op_guard(tssa, _ssa_var, _op_type); \
} \
} while (0)
#define CHECK_OP_TRACE_TYPE(_var, _ssa_var, op_info, op_type) do { \
if (op_type != IS_UNKNOWN) { \
if ((op_info & MAY_BE_GUARD) != 0) { \
if (!zend_jit_type_guard(&ctx, opline, _var, op_type)) { \
goto jit_failure; \
} \
if (ssa->vars[_ssa_var].alias != NO_ALIAS) { \
SET_STACK_TYPE(stack, EX_VAR_TO_NUM(_var), IS_UNKNOWN, 1); \
op_info = zend_jit_trace_type_to_info(op_type); \
} else { \
SET_STACK_TYPE(stack, EX_VAR_TO_NUM(_var), op_type, 1); \
op_info &= ~MAY_BE_GUARD; \
ssa->var_info[_ssa_var].type &= op_info; \
} \
} \
} \
} while (0)
#define ADD_OP1_TRACE_GUARD() \
ADD_OP_GUARD(tssa->ops[idx].op1_use, op1_type)
#define ADD_OP2_TRACE_GUARD() \
ADD_OP_GUARD(tssa->ops[idx].op2_use, op2_type)
#define ADD_OP1_DATA_TRACE_GUARD() \
ADD_OP_GUARD(tssa->ops[idx+1].op1_use, op3_type)
#define CHECK_OP1_TRACE_TYPE() \
CHECK_OP_TRACE_TYPE(opline->op1.var, ssa_op->op1_use, op1_info, op1_type)
#define CHECK_OP2_TRACE_TYPE() \
CHECK_OP_TRACE_TYPE(opline->op2.var, ssa_op->op2_use, op2_info, op2_type)
#define CHECK_OP1_DATA_TRACE_TYPE() \
CHECK_OP_TRACE_TYPE((opline+1)->op1.var, (ssa_op+1)->op1_use, op1_data_info, op3_type)
static zend_always_inline size_t zend_jit_trace_frame_size(const zend_op_array *op_array)
{
if (op_array && op_array->type == ZEND_USER_FUNCTION) {
return ZEND_MM_ALIGNED_SIZE(offsetof(zend_jit_trace_stack_frame, stack) + ZEND_MM_ALIGNED_SIZE((op_array->last_var + op_array->T) * sizeof(zend_jit_trace_stack)));
} else if (op_array) {
return ZEND_MM_ALIGNED_SIZE(offsetof(zend_jit_trace_stack_frame, stack) + ZEND_MM_ALIGNED_SIZE(op_array->num_args * sizeof(zend_jit_trace_stack)));
} else {
return ZEND_MM_ALIGNED_SIZE(offsetof(zend_jit_trace_stack_frame, stack));
}
}
static zend_jit_trace_stack_frame* zend_jit_trace_call_frame(zend_jit_trace_stack_frame *frame, const zend_op_array *op_array)
{
return (zend_jit_trace_stack_frame*)((char*)frame + zend_jit_trace_frame_size(op_array));
}
static zend_jit_trace_stack_frame* zend_jit_trace_ret_frame(zend_jit_trace_stack_frame *frame, const zend_op_array *op_array)
{
return (zend_jit_trace_stack_frame*)((char*)frame - zend_jit_trace_frame_size(op_array));
}
static void zend_jit_trace_send_type(const zend_op *opline, zend_jit_trace_stack_frame *call, uint8_t type)
{
zend_jit_trace_stack *stack = call->stack;
const zend_op_array *op_array = &call->func->op_array;
uint32_t arg_num = opline->op2.num;
if (arg_num > op_array->num_args) {
return;
}
if (op_array->fn_flags & ZEND_ACC_HAS_TYPE_HINTS) {
zend_arg_info *arg_info;
ZEND_ASSERT(arg_num <= op_array->num_args);
arg_info = &op_array->arg_info[arg_num-1];
if (ZEND_TYPE_IS_SET(arg_info->type)) {
if (!(ZEND_TYPE_FULL_MASK(arg_info->type) & (1u << type))) {
return;
}
}
}
SET_STACK_TYPE(stack, EX_VAR_TO_NUM(opline->result.var), type, 1);
}
static bool zend_jit_needs_arg_dtor(const zend_function *func, uint32_t arg_num, zend_call_info *call_info)
{
if (func
&& func->type == ZEND_INTERNAL_FUNCTION
&& (func->internal_function.fn_flags & ZEND_ACC_HAS_TYPE_HINTS) != 0
&& arg_num < func->internal_function.num_args) {
const zend_internal_arg_info *arg_info = &func->internal_function.arg_info[arg_num];
if (ZEND_ARG_SEND_MODE(arg_info) == ZEND_SEND_BY_VAL
&& ZEND_TYPE_IS_SET(arg_info->type)
&& (ZEND_TYPE_FULL_MASK(arg_info->type) & MAY_BE_ANY) != MAY_BE_ANY) {
if (JIT_G(trigger) == ZEND_JIT_ON_HOT_TRACE
&& JIT_G(current_frame)
&& JIT_G(current_frame)->call
&& JIT_G(current_frame)->call->func) {
uint32_t type = STACK_TYPE(JIT_G(current_frame)->call->stack, arg_num);
if (type != IS_UNKNOWN
&& type < IS_STRING
&& ZEND_TYPE_FULL_MASK(arg_info->type) & (1u << type)) {
return 0;
}
}
if (call_info && arg_num < call_info->num_args && call_info->arg_info[arg_num].opline) {
const zend_op *opline = call_info->arg_info[arg_num].opline;
if (opline->opcode == ZEND_SEND_VAL && opline->op1_type == IS_CONST) {
zval *zv = RT_CONSTANT(opline, opline->op1);
if (!Z_REFCOUNTED_P(zv)) {
uint32_t type = Z_TYPE_P(zv);
// TODO: few functions (e.g. pcntl_exec) modify arrays in-place ???
if (type != IS_ARRAY
&& (ZEND_TYPE_FULL_MASK(arg_info->type) & (1u << type))) {
return 0;
}
}
}
}
}
}
return 1;
}
static zend_ssa *zend_jit_trace_build_ssa(const zend_op_array *op_array, zend_script *script)
{
zend_jit_op_array_trace_extension *jit_extension;
zend_ssa *ssa;
jit_extension =
(zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(op_array);
jit_extension->func_info.num = 0;
jit_extension->func_info.flags &= ZEND_FUNC_JIT_ON_FIRST_EXEC
| ZEND_FUNC_JIT_ON_PROF_REQUEST
| ZEND_FUNC_JIT_ON_HOT_COUNTERS
| ZEND_FUNC_JIT_ON_HOT_TRACE;
memset(&jit_extension->func_info.ssa, 0, sizeof(zend_func_info) - offsetof(zend_func_info, ssa));
ssa = &jit_extension->func_info.ssa;
if (JIT_G(opt_level) >= ZEND_JIT_LEVEL_OPT_FUNC) {
do {
if (zend_jit_op_array_analyze1(op_array, script, ssa) != SUCCESS) {
break;
}
if (JIT_G(opt_level) >= ZEND_JIT_LEVEL_OPT_FUNCS) {
zend_analyze_calls(&CG(arena), script, ZEND_CALL_TREE, (zend_op_array*)op_array, &jit_extension->func_info);
jit_extension->func_info.call_map = zend_build_call_map(&CG(arena), &jit_extension->func_info, op_array);
if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
zend_init_func_return_info(op_array, script, &jit_extension->func_info.return_info);
}
}
if (zend_jit_op_array_analyze2(op_array, script, ssa, 0) != SUCCESS) {
break;
}
if (JIT_G(debug) & ZEND_JIT_DEBUG_SSA) {
zend_dump_op_array(op_array, ZEND_DUMP_HIDE_UNREACHABLE|ZEND_DUMP_RC_INFERENCE|ZEND_DUMP_SSA, "JIT", ssa);
}
return ssa;
} while (0);
}
memset(ssa, 0, sizeof(zend_ssa));
ssa->cfg.blocks_count = 1;
if (JIT_G(opt_level) == ZEND_JIT_LEVEL_INLINE) {
zend_cfg cfg;
void *checkpoint = zend_arena_checkpoint(CG(arena));
if (zend_jit_build_cfg(op_array, &cfg) == SUCCESS) {
ssa->cfg.flags = cfg.flags;
} else{
ssa->cfg.flags |= ZEND_FUNC_INDIRECT_VAR_ACCESS;
}
/* TODO: move this to zend_cfg.c ? */
if (!op_array->function_name) {
ssa->cfg.flags |= ZEND_FUNC_INDIRECT_VAR_ACCESS;
}
zend_arena_release(&CG(arena), checkpoint);
}
return ssa;
}
static void zend_jit_dump_trace(zend_jit_trace_rec *trace_buffer, zend_ssa *tssa);
static void zend_jit_dump_exit_info(zend_jit_trace_info *t);
static zend_always_inline int zend_jit_trace_op_len(const zend_op *opline)
{
int len;
switch (opline->opcode) {
case ZEND_ASSIGN_DIM:
case ZEND_ASSIGN_OBJ:
case ZEND_ASSIGN_STATIC_PROP:
case ZEND_ASSIGN_DIM_OP:
case ZEND_ASSIGN_OBJ_OP:
case ZEND_ASSIGN_STATIC_PROP_OP:
case ZEND_ASSIGN_OBJ_REF:
case ZEND_ASSIGN_STATIC_PROP_REF:
case ZEND_FRAMELESS_ICALL_3:
return 2; /* OP_DATA */
case ZEND_RECV_INIT:
len = 1;
opline++;
while (opline->opcode == ZEND_RECV_INIT) {
len++;
opline++;
}
return len;
case ZEND_BIND_GLOBAL:
len = 1;
opline++;
while (opline->opcode == ZEND_BIND_GLOBAL) {
len++;
opline++;
}
return len;
// case ZEND_IS_IDENTICAL:
// case ZEND_IS_NOT_IDENTICAL:
// case ZEND_IS_EQUAL:
// case ZEND_IS_NOT_EQUAL:
// case ZEND_IS_SMALLER:
// case ZEND_IS_SMALLER_OR_EQUAL:
// case ZEND_CASE:
// case ZEND_ISSET_ISEMPTY_CV:
// case ZEND_ISSET_ISEMPTY_VAR:
// case ZEND_ISSET_ISEMPTY_DIM_OBJ:
// case ZEND_ISSET_ISEMPTY_PROP_OBJ:
// case ZEND_ISSET_ISEMPTY_STATIC_PROP:
// case ZEND_INSTANCEOF:
// case ZEND_TYPE_CHECK:
// case ZEND_DEFINED:
// case ZEND_IN_ARRAY:
// case ZEND_ARRAY_KEY_EXISTS:
default:
if ((opline->result_type & (IS_SMART_BRANCH_JMPZ|IS_SMART_BRANCH_JMPNZ)) != 0) {
return 2; /* JMPZ/JMPNZ */
}
return 1;
}
}
static int zend_jit_trace_add_phis(zend_jit_trace_rec *trace_buffer, uint32_t ssa_vars_count, zend_ssa *tssa, zend_jit_trace_stack *stack)
{
const zend_op_array *op_array;
zend_jit_trace_rec *p;
int k, vars_count;
zend_bitset use, def;
uint32_t build_flags = ZEND_SSA_RC_INFERENCE | ZEND_SSA_USE_CV_RESULTS;
uint32_t set_size;
zend_ssa_phi *prev = NULL;
int level = 0;
ALLOCA_FLAG(use_heap);
op_array = trace_buffer->op_array;
set_size = zend_bitset_len(op_array->last_var + op_array->T);
use = ZEND_BITSET_ALLOCA(set_size * 2, use_heap);
memset(use, 0, set_size * 2 * ZEND_BITSET_ELM_SIZE);
def = use + set_size;
p = trace_buffer + ZEND_JIT_TRACE_START_REC_SIZE;
for (;;p++) {
if (p->op == ZEND_JIT_TRACE_VM && level == 0) {
const zend_op *opline = p->opline;
int len;
zend_dfg_add_use_def_op(op_array, opline, build_flags, use, def);
len = zend_jit_trace_op_len(opline);
while (len > 1) {
opline++;
if (opline->opcode != ZEND_OP_DATA) {
zend_dfg_add_use_def_op(op_array, opline, build_flags, use, def);
}
len--;
}
} else if (p->op == ZEND_JIT_TRACE_INIT_CALL) {
} else if (p->op == ZEND_JIT_TRACE_DO_ICALL) {
} else if (p->op == ZEND_JIT_TRACE_ENTER) {
level++;
} else if (p->op == ZEND_JIT_TRACE_BACK) {
if (level == 0) {
// Phi for recursive calls and returns are not supported yet ???
assert(0);
} else {
level--;
}
} else if (p->op == ZEND_JIT_TRACE_END) {
break;
}
}
zend_bitset_intersection(use, def, set_size);
if (trace_buffer->start == ZEND_JIT_TRACE_START_ENTER) {
vars_count = op_array->last_var;
} else {
vars_count = op_array->last_var + op_array->T;
}
for (k = 0; k < vars_count; k++) {
if (zend_bitset_in(use, k)) {
zend_ssa_phi *phi = zend_arena_calloc(&CG(arena), 1,
ZEND_MM_ALIGNED_SIZE(sizeof(zend_ssa_phi)) +
ZEND_MM_ALIGNED_SIZE(sizeof(int) * 2) +
sizeof(void*) * 2);
phi->sources = (int*)(((char*)phi) + ZEND_MM_ALIGNED_SIZE(sizeof(zend_ssa_phi)));
phi->sources[0] = STACK_VAR(stack, k);
phi->sources[1] = -1;
phi->use_chains = (zend_ssa_phi**)(((char*)phi->sources) + ZEND_MM_ALIGNED_SIZE(sizeof(int) * 2));
phi->pi = -1;
phi->var = k;
phi->ssa_var = ssa_vars_count;
SET_STACK_VAR(stack, k, ssa_vars_count);
ssa_vars_count++;
phi->block = 1;
if (prev) {
prev->next = phi;
} else {
tssa->blocks[1].phis = phi;
}
prev = phi;
}
}
free_alloca(use, use_heap);
return ssa_vars_count;
}
static int zend_jit_trace_add_call_phis(zend_jit_trace_rec *trace_buffer, uint32_t ssa_vars_count, zend_ssa *tssa, zend_jit_trace_stack *stack)
{
zend_ssa_phi *prev = NULL;
const zend_op_array *op_array = trace_buffer->op_array;
const zend_op *opline = trace_buffer[1].opline;
int count = opline - op_array->opcodes;
int i;
for(i = 0; i < count; i++) {
zend_ssa_phi *phi = zend_arena_calloc(&CG(arena), 1,
ZEND_MM_ALIGNED_SIZE(sizeof(zend_ssa_phi)) +
ZEND_MM_ALIGNED_SIZE(sizeof(int) * 2) +
sizeof(void*) * 2);
phi->sources = (int*)(((char*)phi) + ZEND_MM_ALIGNED_SIZE(sizeof(zend_ssa_phi)));
phi->sources[0] = STACK_VAR(stack, i);
phi->sources[1] = -1;
phi->use_chains = (zend_ssa_phi**)(((char*)phi->sources) + ZEND_MM_ALIGNED_SIZE(sizeof(int) * 2));
phi->pi = -1;
phi->var = i;
phi->ssa_var = ssa_vars_count;
SET_STACK_VAR(stack, i, ssa_vars_count);
ssa_vars_count++;
phi->block = 1;
if (prev) {
prev->next = phi;
} else {
tssa->blocks[1].phis = phi;
}
prev = phi;
}
return ssa_vars_count;
}
static int zend_jit_trace_add_ret_phis(zend_jit_trace_rec *trace_buffer, uint32_t ssa_vars_count, zend_ssa *tssa, zend_jit_trace_stack *stack)
{
const zend_op *opline = trace_buffer[1].opline - 1;
int i;
if (RETURN_VALUE_USED(opline)) {
zend_ssa_phi *phi = zend_arena_calloc(&CG(arena), 1,
ZEND_MM_ALIGNED_SIZE(sizeof(zend_ssa_phi)) +
ZEND_MM_ALIGNED_SIZE(sizeof(int) * 2) +
sizeof(void*) * 2);
i = EX_VAR_TO_NUM(opline->result.var);
phi->sources = (int*)(((char*)phi) + ZEND_MM_ALIGNED_SIZE(sizeof(zend_ssa_phi)));
phi->sources[0] = STACK_VAR(stack, i);
phi->sources[1] = -1;
phi->use_chains = (zend_ssa_phi**)(((char*)phi->sources) + ZEND_MM_ALIGNED_SIZE(sizeof(int) * 2));
phi->pi = -1;
phi->var = i;
phi->ssa_var = ssa_vars_count;
SET_STACK_VAR(stack, i, ssa_vars_count);
ssa_vars_count++;
phi->block = 1;
tssa->blocks[1].phis = phi;
}
return ssa_vars_count;
}
static bool zend_jit_trace_is_false_loop(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op **tssa_opcodes, zend_ssa *tssa)
{
const zend_op *opline;
uint32_t b;
zend_basic_block *bb;
ZEND_ASSERT(tssa->cfg.blocks_count == 2);
ZEND_ASSERT(tssa->cfg.blocks[1].len > 0);
b = ssa->cfg.map[tssa_opcodes[0] - op_array->opcodes];
opline = tssa_opcodes[tssa->cfg.blocks[1].len - 1];
if (opline >= op_array->opcodes && opline < op_array->opcodes + op_array->last) {
bb = ssa->cfg.blocks + ssa->cfg.map[opline - op_array->opcodes];
return bb->loop_header != b;
} else {
return 0;
}
}
static int zend_jit_trace_copy_ssa_var_info(const zend_op_array *op_array,
const zend_ssa *ssa,
const zend_op **tssa_opcodes,
zend_ssa *tssa,
int ssa_var,
const zend_op *opline)
{
int var, use, def, src;
zend_ssa_op *op;
if (tssa->vars[ssa_var].definition_phi) {
uint32_t b = ssa->cfg.map[tssa_opcodes[0] - op_array->opcodes];
zend_basic_block *bb = ssa->cfg.blocks + b;
if ((bb->flags & ZEND_BB_LOOP_HEADER)
&& !zend_jit_trace_is_false_loop(op_array, ssa, tssa_opcodes, tssa)) {
zend_ssa_phi *phi = ssa->blocks[b].phis;
zend_ssa_phi *pi = NULL;
var = tssa->vars[ssa_var].var;
while (phi) {
if (ssa->vars[phi->ssa_var].var == var) {
if (phi->pi >= 0) {
pi = phi;
} else {
src = phi->ssa_var;
goto copy_info;
}
}
phi = phi->next;
}
if (pi) {
src = pi->ssa_var;
goto copy_info;
}
#if 0
while (bb->idom >= 0) {
uint32_t n;
b = bb->idom;
bb = ssa->cfg.blocks + b;
for (n = bb->len, op = ssa->ops + bb->start + n; n > 0; n--) {
op--;
if (op->result_def >= 0 && ssa->vars[op->result_def].var == var) {
src = op->result_def;
goto copy_info;
} else if (op->op2_def >= 0 && ssa->vars[op->op2_def].var == var) {
src = op->op2_def;
goto copy_info;
} else if (op->op1_def >= 0 && ssa->vars[op->op1_def].var == var) {
src = op->op1_def;
goto copy_info;
}
}
phi = ssa->blocks[b].phis;
zend_ssa_phi *pi = NULL;
while (phi) {
if (ssa->vars[phi->ssa_var].var == var) {
if (phi->pi >= 0) {
pi = phi;
} else {
src = phi->ssa_var;
goto copy_info;
}
}
phi = phi->next;
}
if (pi) {
src = pi->ssa_var;
goto copy_info;
}
}
#endif
}
} else if (tssa->vars[ssa_var].definition >= 0) {
def = tssa->vars[ssa_var].definition;
ZEND_ASSERT((tssa_opcodes[def] - op_array->opcodes) < op_array->last);
op = ssa->ops + (tssa_opcodes[def] - op_array->opcodes);
if (tssa->ops[def].op1_def == ssa_var) {
src = op->op1_def;
} else if (tssa->ops[def].op2_def == ssa_var) {
src = op->op2_def;
} else if (tssa->ops[def].result_def == ssa_var) {
src = op->result_def;
} else {
assert(0);
return 0;
}
goto copy_info;
}
if (tssa->vars[ssa_var].phi_use_chain) {
// TODO: this may be incorrect ???
var = tssa->vars[ssa_var].phi_use_chain->ssa_var;
} else {
var = ssa_var;
}
use = tssa->vars[var].use_chain;
if (use >= 0) {
ZEND_ASSERT((tssa_opcodes[use] - op_array->opcodes) < op_array->last);
op = ssa->ops + (tssa_opcodes[use] - op_array->opcodes);
if (tssa->ops[use].op1_use == var) {
src = op->op1_use;
} else if (tssa->ops[use].op2_use == var) {
src = op->op2_use;
} else if (tssa->ops[use].result_use == var) {
src = op->result_use;
} else {
assert(0);
return 0;
}
if (opline) {
/* Try to find a difinition in SSA dominators tree */
var = tssa->vars[ssa_var].var;
uint32_t op_num = opline - op_array->opcodes;
uint32_t b = ssa->cfg.map[op_num];
zend_basic_block *bb = ssa->cfg.blocks + b;
zend_ssa_phi *pi, *phi;
while (1) {
while (op_num > bb->start) {
op_num--;
op = ssa->ops + op_num;
if (op->result_def >= 0 && ssa->vars[op->result_def].var == var) {
src = op->result_def;
goto copy_info;
} else if (op->op2_def >= 0 && ssa->vars[op->op2_def].var == var) {
src = op->op2_def;
goto copy_info;
} else if (op->op1_def >= 0 && ssa->vars[op->op1_def].var == var) {
src = op->op1_def;
goto copy_info;
}
}
phi = ssa->blocks[b].phis;
pi = NULL;
while (phi) {
if (ssa->vars[phi->ssa_var].var == var) {
if (phi->pi >= 0) {
pi = phi;
} else {
src = phi->ssa_var;
goto copy_info;
}
}
phi = phi->next;
}
if (pi) {
src = pi->ssa_var;
goto copy_info;
}
if (bb->idom < 0) {
break;
}
b = bb->idom;
bb = ssa->cfg.blocks + b;
op_num = bb->start + bb->len;
}
}
goto copy_info;
}
return 0;
copy_info:
tssa->vars[ssa_var].no_val = ssa->vars[src].no_val;
tssa->vars[ssa_var].alias = ssa->vars[src].alias;
memcpy(&tssa->var_info[ssa_var], &ssa->var_info[src], sizeof(zend_ssa_var_info));
return 1;
}
static void zend_jit_trace_propagate_range(const zend_op_array *op_array, const zend_op **tssa_opcodes, zend_ssa *tssa, int ssa_var)
{
zend_ssa_range tmp;
int def = tssa->vars[ssa_var].definition;
if (tssa->vars[ssa_var].alias == NO_ALIAS
&& zend_inference_propagate_range(op_array, tssa, tssa_opcodes[def], &tssa->ops[def], ssa_var, &tmp)) {
tssa->var_info[ssa_var].range.min = tmp.min;
tssa->var_info[ssa_var].range.max = tmp.max;
tssa->var_info[ssa_var].range.underflow = tmp.underflow;
tssa->var_info[ssa_var].range.overflow = tmp.overflow;
tssa->var_info[ssa_var].has_range = 1;
}
}
static void zend_jit_trace_copy_ssa_var_range(const zend_op_array *op_array, const zend_ssa *ssa, const zend_op **tssa_opcodes, zend_ssa *tssa, int ssa_var)
{
int def;
zend_ssa_op *op;
zend_ssa_var_info *info;
unsigned int no_val;