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dis-bench / src /php /php-src /Zend /Optimizer /block_pass.c
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/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| 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 |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@php.net> |
| Zeev Suraski <zeev@php.net> |
| Stanislav Malyshev <stas@zend.com> |
| Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#include "Optimizer/zend_optimizer.h"
#include "Optimizer/zend_optimizer_internal.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_vm.h"
#include "zend_bitset.h"
#include "zend_cfg.h"
#include "zend_dump.h"
/* Checks if a constant (like "true") may be replaced by its value */
bool zend_optimizer_get_persistent_constant(zend_string *name, zval *result, int copy)
{
zend_constant *c = zend_hash_find_ptr(EG(zend_constants), name);
if (c) {
if ((ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT)
&& !(ZEND_CONSTANT_FLAGS(c) & CONST_DEPRECATED)
&& (!(ZEND_CONSTANT_FLAGS(c) & CONST_NO_FILE_CACHE)
|| !(CG(compiler_options) & ZEND_COMPILE_WITH_FILE_CACHE))) {
ZVAL_COPY_VALUE(result, &c->value);
if (copy) {
Z_TRY_ADDREF_P(result);
}
return 1;
} else {
return 0;
}
}
/* Special constants null/true/false can always be substituted. */
c = zend_get_special_const(ZSTR_VAL(name), ZSTR_LEN(name));
if (c) {
ZVAL_COPY_VALUE(result, &c->value);
return 1;
}
return 0;
}
/* Data dependencies macros */
#define VAR_SOURCE(op) Tsource[VAR_NUM(op.var)]
#define SET_VAR_SOURCE(opline) Tsource[VAR_NUM(opline->result.var)] = opline
static void strip_leading_nops(zend_op_array *op_array, zend_basic_block *b)
{
zend_op *opcodes = op_array->opcodes;
do {
b->start++;
b->len--;
} while (b->len > 0 && opcodes[b->start].opcode == ZEND_NOP);
}
static void strip_nops(zend_op_array *op_array, zend_basic_block *b)
{
uint32_t i, j;
if (b->len == 0) {
return;
}
if (op_array->opcodes[b->start].opcode == ZEND_NOP) {
strip_leading_nops(op_array, b);
}
if (b->len == 0) {
return;
}
/* strip the inside NOPs */
i = j = b->start + 1;
while (i < b->start + b->len) {
if (op_array->opcodes[i].opcode != ZEND_NOP) {
if (i != j) {
op_array->opcodes[j] = op_array->opcodes[i];
}
j++;
}
i++;
}
b->len = j - b->start;
while (j < i) {
MAKE_NOP(op_array->opcodes + j);
j++;
}
}
static int get_const_switch_target(zend_cfg *cfg, zend_op_array *op_array, zend_basic_block *block, zend_op *opline, zval *val) {
HashTable *jumptable = Z_ARRVAL(ZEND_OP2_LITERAL(opline));
zval *zv;
if ((opline->opcode == ZEND_SWITCH_LONG && Z_TYPE_P(val) != IS_LONG)
|| (opline->opcode == ZEND_SWITCH_STRING && Z_TYPE_P(val) != IS_STRING)) {
/* fallback to next block */
return block->successors[block->successors_count - 1];
}
if (opline->opcode == ZEND_MATCH && Z_TYPE_P(val) != IS_LONG && Z_TYPE_P(val) != IS_STRING) {
/* always jump to the default arm */
return block->successors[block->successors_count - 1];
}
if (Z_TYPE_P(val) == IS_LONG) {
zv = zend_hash_index_find(jumptable, Z_LVAL_P(val));
} else {
ZEND_ASSERT(Z_TYPE_P(val) == IS_STRING);
zv = zend_hash_find(jumptable, Z_STR_P(val));
}
if (!zv) {
/* default */
return block->successors[block->successors_count - (opline->opcode == ZEND_MATCH ? 1 : 2)];
}
return cfg->map[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv))];
}
static void zend_optimize_block(zend_basic_block *block, zend_op_array *op_array, zend_bitset used_ext, zend_cfg *cfg, zend_op **Tsource, uint32_t *opt_count)
{
zend_op *opline, *src;
zend_op *end, *last_op = NULL;
if (block->len == 0) {
return;
}
if (op_array->opcodes[block->start].opcode == ZEND_NOP) {
/* remove leading NOPs */
strip_leading_nops(op_array, block);
}
opline = op_array->opcodes + block->start;
end = opline + block->len;
while (opline < end) {
/* Constant Propagation: strip X = QM_ASSIGN(const) */
if (opline->op1_type == IS_TMP_VAR &&
opline->opcode != ZEND_FREE) {
src = VAR_SOURCE(opline->op1);
if (src &&
src->opcode == ZEND_QM_ASSIGN &&
src->op1_type == IS_CONST
) {
znode_op op1 = opline->op1;
if (opline->opcode == ZEND_VERIFY_RETURN_TYPE) {
COPY_NODE(opline->result, opline->op1);
COPY_NODE(opline->op1, src->op1);
VAR_SOURCE(op1) = NULL;
MAKE_NOP(src);
++(*opt_count);
} else {
zval c;
ZVAL_COPY(&c, &ZEND_OP1_LITERAL(src));
if (opline->opcode != ZEND_CASE
&& opline->opcode != ZEND_CASE_STRICT
&& opline->opcode != ZEND_FETCH_LIST_R
&& opline->opcode != ZEND_SWITCH_LONG
&& opline->opcode != ZEND_SWITCH_STRING
&& opline->opcode != ZEND_MATCH
&& opline->opcode != ZEND_MATCH_ERROR
&& zend_optimizer_update_op1_const(op_array, opline, &c)) {
VAR_SOURCE(op1) = NULL;
if (opline->opcode != ZEND_JMP_NULL
&& !zend_bitset_in(used_ext, VAR_NUM(src->result.var))) {
literal_dtor(&ZEND_OP1_LITERAL(src));
MAKE_NOP(src);
}
++(*opt_count);
} else {
zval_ptr_dtor_nogc(&c);
}
}
}
}
/* Constant Propagation: strip X = QM_ASSIGN(const) */
if (opline->op2_type == IS_TMP_VAR) {
src = VAR_SOURCE(opline->op2);
if (src &&
src->opcode == ZEND_QM_ASSIGN &&
src->op1_type == IS_CONST) {
znode_op op2 = opline->op2;
zval c;
ZVAL_COPY(&c, &ZEND_OP1_LITERAL(src));
if (zend_optimizer_update_op2_const(op_array, opline, &c)) {
VAR_SOURCE(op2) = NULL;
if (!zend_bitset_in(used_ext, VAR_NUM(src->result.var))) {
literal_dtor(&ZEND_OP1_LITERAL(src));
MAKE_NOP(src);
}
++(*opt_count);
} else {
zval_ptr_dtor_nogc(&c);
}
}
}
switch (opline->opcode) {
case ZEND_ECHO:
if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
src = VAR_SOURCE(opline->op1);
if (src &&
src->opcode == ZEND_CAST &&
src->extended_value == IS_STRING) {
/* T = CAST(X, String), ECHO(T) => NOP, ECHO(X) */
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
++(*opt_count);
}
} else if (opline->op1_type == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_DOUBLE) {
if (last_op == opline - 1) {
/* compress consecutive ECHO's.
* Float to string conversion may be affected by current
* locale setting.
*/
size_t l, old_len;
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP1_LITERAL(opline));
}
if (Z_TYPE(ZEND_OP1_LITERAL(last_op)) != IS_STRING) {
convert_to_string(&ZEND_OP1_LITERAL(last_op));
}
old_len = Z_STRLEN(ZEND_OP1_LITERAL(last_op));
l = old_len + Z_STRLEN(ZEND_OP1_LITERAL(opline));
if (!Z_REFCOUNTED(ZEND_OP1_LITERAL(last_op))) {
zend_string *tmp = zend_string_alloc(l, 0);
memcpy(ZSTR_VAL(tmp), Z_STRVAL(ZEND_OP1_LITERAL(last_op)), old_len);
Z_STR(ZEND_OP1_LITERAL(last_op)) = tmp;
} else {
Z_STR(ZEND_OP1_LITERAL(last_op)) = zend_string_extend(Z_STR(ZEND_OP1_LITERAL(last_op)), l, 0);
}
Z_TYPE_INFO(ZEND_OP1_LITERAL(last_op)) = IS_STRING_EX;
memcpy(Z_STRVAL(ZEND_OP1_LITERAL(last_op)) + old_len, Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)));
Z_STRVAL(ZEND_OP1_LITERAL(last_op))[l] = '\0';
zval_ptr_dtor_nogc(&ZEND_OP1_LITERAL(opline));
ZVAL_STR(&ZEND_OP1_LITERAL(opline), zend_new_interned_string(Z_STR(ZEND_OP1_LITERAL(last_op))));
ZVAL_NULL(&ZEND_OP1_LITERAL(last_op));
MAKE_NOP(last_op);
++(*opt_count);
}
last_op = opline;
}
break;
case ZEND_MATCH_ERROR:
if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
src = VAR_SOURCE(opline->op1);
VAR_SOURCE(opline->op1) = NULL;
}
break;
case ZEND_FREE:
/* Note: Only remove the source if the source is local to this block.
* If it's not local, then the other blocks successors must also eventually either FREE or consume the temporary,
* hence removing the temporary is not safe in the general case, especially when other consumers are not FREE.
* A FREE may not be removed without also removing the source's result, because otherwise that would cause a memory leak. */
if (opline->extended_value == ZEND_FREE_VOID_CAST) {
/* Keep the ZEND_FREE opcode alive. */
} else if (opline->op1_type == IS_TMP_VAR) {
src = VAR_SOURCE(opline->op1);
if (src) {
switch (src->opcode) {
case ZEND_BOOL:
case ZEND_BOOL_NOT:
/* T = BOOL(X), FREE(T) => T = BOOL(X) */
/* The remaining BOOL is removed by a separate optimization */
/* The source is a bool, no source removals take place, so this may be done non-locally. */
VAR_SOURCE(opline->op1) = NULL;
MAKE_NOP(opline);
++(*opt_count);
break;
case ZEND_ASSIGN:
case ZEND_ASSIGN_DIM:
case ZEND_ASSIGN_OBJ:
case ZEND_ASSIGN_STATIC_PROP:
case ZEND_ASSIGN_OP:
case ZEND_ASSIGN_DIM_OP:
case ZEND_ASSIGN_OBJ_OP:
case ZEND_ASSIGN_STATIC_PROP_OP:
case ZEND_PRE_INC:
case ZEND_PRE_DEC:
case ZEND_PRE_INC_OBJ:
case ZEND_PRE_DEC_OBJ:
case ZEND_PRE_INC_STATIC_PROP:
case ZEND_PRE_DEC_STATIC_PROP:
if (src < op_array->opcodes + block->start) {
break;
}
src->result_type = IS_UNUSED;
VAR_SOURCE(opline->op1) = NULL;
MAKE_NOP(opline);
++(*opt_count);
break;
default:
break;
}
}
} else if (opline->op1_type == IS_VAR) {
src = VAR_SOURCE(opline->op1);
/* V = OP, FREE(V) => OP. NOP */
if (src >= op_array->opcodes + block->start &&
src->opcode != ZEND_FETCH_R &&
src->opcode != ZEND_FETCH_STATIC_PROP_R &&
src->opcode != ZEND_FETCH_DIM_R &&
src->opcode != ZEND_FETCH_OBJ_R &&
src->opcode != ZEND_NEW &&
src->opcode != ZEND_FETCH_THIS) {
src->result_type = IS_UNUSED;
MAKE_NOP(opline);
++(*opt_count);
if (src->opcode == ZEND_QM_ASSIGN) {
if (src->op1_type & (IS_VAR|IS_TMP_VAR)) {
src->opcode = ZEND_FREE;
} else {
MAKE_NOP(src);
}
}
}
}
break;
#if 0
/* pre-evaluate functions:
constant(x)
function_exists(x)
extension_loaded(x)
BAD: interacts badly with Accelerator
*/
if((opline->op1_type & IS_VAR) &&
VAR_SOURCE(opline->op1) && VAR_SOURCE(opline->op1)->opcode == ZEND_DO_CF_FCALL &&
VAR_SOURCE(opline->op1)->extended_value == 1) {
zend_op *fcall = VAR_SOURCE(opline->op1);
zend_op *sv = fcall-1;
if(sv >= block->start_opline && sv->opcode == ZEND_SEND_VAL &&
sv->op1_type == IS_CONST && Z_TYPE(OPLINE_OP1_LITERAL(sv)) == IS_STRING &&
Z_LVAL(OPLINE_OP2_LITERAL(sv)) == 1
) {
zval *arg = &OPLINE_OP1_LITERAL(sv);
char *fname = FUNCTION_CACHE->funcs[Z_LVAL(ZEND_OP1_LITERAL(fcall))].function_name;
size_t flen = FUNCTION_CACHE->funcs[Z_LVAL(ZEND_OP1_LITERAL(fcall))].name_len;
if((flen == sizeof("function_exists")-1 && zend_binary_strcasecmp(fname, flen, "function_exists", sizeof("function_exists")-1) == 0) ||
(flen == sizeof("is_callable")-1 && zend_binary_strcasecmp(fname, flen, "is_callable", sizeof("is_callable")-1) == 0)
) {
zend_function *function;
if((function = zend_hash_find_ptr(EG(function_table), Z_STR_P(arg))) != NULL) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
LITERAL_BOOL(opline->op1, 1);
opline->op1_type = IS_CONST;
}
} else if(flen == sizeof("constant")-1 && zend_binary_strcasecmp(fname, flen, "constant", sizeof("constant")-1) == 0) {
zval c;
if (zend_optimizer_get_persistent_constant(Z_STR_P(arg), &c, 1 ELS_CC)) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
ZEND_OP1_LITERAL(opline) = zend_optimizer_add_literal(op_array, &c);
/* no copy ctor - get already copied it */
opline->op1_type = IS_CONST;
}
} else if(flen == sizeof("extension_loaded")-1 && zend_binary_strcasecmp(fname, flen, "extension_loaded", sizeof("extension_loaded")-1) == 0) {
if(zend_hash_exists(&module_registry, Z_STR_P(arg))) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
LITERAL_BOOL(opline->op1, 1);
opline->op1_type = IS_CONST;
}
}
}
}
#endif
case ZEND_FETCH_LIST_R:
case ZEND_FETCH_LIST_W:
if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
/* LIST variable will be deleted later by FREE */
Tsource[VAR_NUM(opline->op1.var)] = NULL;
}
break;
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
/* SWITCH variable will be deleted later by FREE, so we can't optimize it */
Tsource[VAR_NUM(opline->op1.var)] = NULL;
break;
}
if (opline->op1_type == IS_CONST) {
int target = get_const_switch_target(cfg, op_array, block, opline, &ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
opline->opcode = ZEND_JMP;
opline->op1_type = IS_UNUSED;
opline->op2_type = IS_UNUSED;
block->successors_count = 1;
block->successors[0] = target;
}
break;
case ZEND_CASE:
case ZEND_CASE_STRICT:
case ZEND_COPY_TMP:
if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
/* Variable will be deleted later by FREE, so we can't optimize it */
Tsource[VAR_NUM(opline->op1.var)] = NULL;
break;
}
ZEND_FALLTHROUGH;
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
if (opline->op1_type == IS_CONST &&
opline->op2_type == IS_CONST) {
goto optimize_constant_binary_op;
}
/* IS_EQ(TRUE, X) => BOOL(X)
* IS_EQ(FALSE, X) => BOOL_NOT(X)
* IS_NOT_EQ(TRUE, X) => BOOL_NOT(X)
* IS_NOT_EQ(FALSE, X) => BOOL(X)
* CASE(TRUE, X) => BOOL(X)
* CASE(FALSE, X) => BOOL_NOT(X)
*/
if (opline->op1_type == IS_CONST &&
(Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_FALSE ||
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_TRUE)) {
/* Optimization of comparison with "null" is not safe,
* because ("0" == null) is not equal to !("0")
*/
opline->opcode =
((opline->opcode != ZEND_IS_NOT_EQUAL) == ((Z_TYPE(ZEND_OP1_LITERAL(opline))) == IS_TRUE)) ?
ZEND_BOOL : ZEND_BOOL_NOT;
COPY_NODE(opline->op1, opline->op2);
SET_UNUSED(opline->op2);
++(*opt_count);
goto optimize_bool;
} else if (opline->op2_type == IS_CONST &&
(Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_FALSE ||
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_TRUE)) {
/* Optimization of comparison with "null" is not safe,
* because ("0" == null) is not equal to !("0")
*/
opline->opcode =
((opline->opcode != ZEND_IS_NOT_EQUAL) == ((Z_TYPE(ZEND_OP2_LITERAL(opline))) == IS_TRUE)) ?
ZEND_BOOL : ZEND_BOOL_NOT;
SET_UNUSED(opline->op2);
++(*opt_count);
goto optimize_bool;
}
break;
case ZEND_IS_IDENTICAL:
if (opline->op1_type == IS_CONST &&
opline->op2_type == IS_CONST) {
goto optimize_constant_binary_op;
}
if (opline->op1_type == IS_CONST &&
(Z_TYPE(ZEND_OP1_LITERAL(opline)) <= IS_TRUE && Z_TYPE(ZEND_OP1_LITERAL(opline)) >= IS_NULL)) {
/* IS_IDENTICAL(TRUE, T) => TYPE_CHECK(T, TRUE)
* IS_IDENTICAL(FALSE, T) => TYPE_CHECK(T, FALSE)
* IS_IDENTICAL(NULL, T) => TYPE_CHECK(T, NULL)
*/
opline->opcode = ZEND_TYPE_CHECK;
opline->extended_value = (1 << Z_TYPE(ZEND_OP1_LITERAL(opline)));
COPY_NODE(opline->op1, opline->op2);
SET_UNUSED(opline->op2);
++(*opt_count);
goto optimize_type_check;
} else if (opline->op2_type == IS_CONST &&
(Z_TYPE(ZEND_OP2_LITERAL(opline)) <= IS_TRUE && Z_TYPE(ZEND_OP2_LITERAL(opline)) >= IS_NULL)) {
/* IS_IDENTICAL(T, TRUE) => TYPE_CHECK(T, TRUE)
* IS_IDENTICAL(T, FALSE) => TYPE_CHECK(T, FALSE)
* IS_IDENTICAL(T, NULL) => TYPE_CHECK(T, NULL)
*/
opline->opcode = ZEND_TYPE_CHECK;
opline->extended_value = (1 << Z_TYPE(ZEND_OP2_LITERAL(opline)));
SET_UNUSED(opline->op2);
++(*opt_count);
goto optimize_type_check;
}
break;
case ZEND_TYPE_CHECK:
optimize_type_check:
if (opline->extended_value == (1 << IS_TRUE) || opline->extended_value == (1 << IS_FALSE)) {
if (opline->op1_type == IS_TMP_VAR &&
!zend_bitset_in(used_ext, VAR_NUM(opline->op1.var))) {
src = VAR_SOURCE(opline->op1);
if (src) {
switch (src->opcode) {
case ZEND_BOOL:
case ZEND_BOOL_NOT:
/* T = BOOL(X) + TYPE_CHECK(T, TRUE) -> BOOL(X), NOP
* T = BOOL(X) + TYPE_CHECK(T, FALSE) -> BOOL_NOT(X), NOP
* T = BOOL_NOT(X) + TYPE_CHECK(T, TRUE) -> BOOL_NOT(X), NOP
* T = BOOL_NOT(X) + TYPE_CHECK(T, FALSE) -> BOOL(X), NOP
*/
src->opcode =
((src->opcode == ZEND_BOOL) == (opline->extended_value == (1 << IS_TRUE))) ?
ZEND_BOOL : ZEND_BOOL_NOT;
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
}
}
}
}
break;
case ZEND_BOOL:
case ZEND_BOOL_NOT:
optimize_bool:
if (opline->op1_type == IS_CONST) {
goto optimize_const_unary_op;
}
if (opline->op1_type == IS_TMP_VAR &&
!zend_bitset_in(used_ext, VAR_NUM(opline->op1.var))) {
src = VAR_SOURCE(opline->op1);
if (src) {
switch (src->opcode) {
case ZEND_BOOL_NOT:
/* T = BOOL_NOT(X) + BOOL(T) -> NOP, BOOL_NOT(X) */
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
opline->opcode = (opline->opcode == ZEND_BOOL) ? ZEND_BOOL_NOT : ZEND_BOOL;
MAKE_NOP(src);
++(*opt_count);
goto optimize_bool;
case ZEND_BOOL:
/* T = BOOL(X) + BOOL(T) -> NOP, BOOL(X) */
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
++(*opt_count);
goto optimize_bool;
case ZEND_IS_EQUAL:
if (opline->opcode == ZEND_BOOL_NOT) {
src->opcode = ZEND_IS_NOT_EQUAL;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
case ZEND_IS_NOT_EQUAL:
if (opline->opcode == ZEND_BOOL_NOT) {
src->opcode = ZEND_IS_EQUAL;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
case ZEND_IS_IDENTICAL:
if (opline->opcode == ZEND_BOOL_NOT) {
src->opcode = ZEND_IS_NOT_IDENTICAL;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
case ZEND_IS_NOT_IDENTICAL:
if (opline->opcode == ZEND_BOOL_NOT) {
src->opcode = ZEND_IS_IDENTICAL;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
case ZEND_IS_SMALLER:
if (opline->opcode == ZEND_BOOL_NOT) {
uint8_t tmp_type;
uint32_t tmp;
src->opcode = ZEND_IS_SMALLER_OR_EQUAL;
tmp_type = src->op1_type;
src->op1_type = src->op2_type;
src->op2_type = tmp_type;
tmp = src->op1.num;
src->op1.num = src->op2.num;
src->op2.num = tmp;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
case ZEND_IS_SMALLER_OR_EQUAL:
if (opline->opcode == ZEND_BOOL_NOT) {
uint8_t tmp_type;
uint32_t tmp;
src->opcode = ZEND_IS_SMALLER;
tmp_type = src->op1_type;
src->op1_type = src->op2_type;
src->op2_type = tmp_type;
tmp = src->op1.num;
src->op1.num = src->op2.num;
src->op2.num = tmp;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
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->opcode == ZEND_BOOL_NOT) {
break;
}
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
++(*opt_count);
break;
}
}
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
while (1) {
if (opline->op1_type == IS_CONST) {
++(*opt_count);
block->successors_count = 1;
if (zend_is_true(&ZEND_OP1_LITERAL(opline)) ==
(opline->opcode == ZEND_JMPZ)) {
MAKE_NOP(opline);
block->successors[0] = block->successors[1];
block->len--;
cfg->blocks[block->successors[0]].flags |= ZEND_BB_FOLLOW;
break;
} else {
zend_basic_block *next = cfg->blocks + block->successors[1];
next->flags &= ~ZEND_BB_FOLLOW;
if (!(next->flags & (ZEND_BB_TARGET|ZEND_BB_PROTECTED))) {
next->flags &= ~ZEND_BB_REACHABLE;
}
opline->opcode = ZEND_JMP;
COPY_NODE(opline->op1, opline->op2);
break;
}
} else if (opline->op1_type == IS_TMP_VAR &&
!zend_bitset_in(used_ext, VAR_NUM(opline->op1.var))) {
src = VAR_SOURCE(opline->op1);
if (src) {
if (src->opcode == ZEND_BOOL_NOT) {
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
/* T = BOOL_NOT(X) + JMPZ(T) -> NOP, JMPNZ(X) */
opline->opcode = INV_COND(opline->opcode);
MAKE_NOP(src);
++(*opt_count);
continue;
} else if (src->opcode == ZEND_BOOL ||
src->opcode == ZEND_QM_ASSIGN) {
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
++(*opt_count);
continue;
}
}
}
break;
}
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
while (1) {
if (opline->op1_type == IS_CONST) {
bool is_jmpz_ex = opline->opcode == ZEND_JMPZ_EX;
if (zend_is_true(&ZEND_OP1_LITERAL(opline)) == is_jmpz_ex) {
++(*opt_count);
opline->opcode = ZEND_QM_ASSIGN;
zval_ptr_dtor_nogc(&ZEND_OP1_LITERAL(opline));
ZVAL_BOOL(&ZEND_OP1_LITERAL(opline), is_jmpz_ex);
opline->op2.num = 0;
block->successors_count = 1;
block->successors[0] = block->successors[1];
cfg->blocks[block->successors[0]].flags |= ZEND_BB_FOLLOW;
break;
}
} else if (opline->op1_type == IS_TMP_VAR &&
(!zend_bitset_in(used_ext, VAR_NUM(opline->op1.var)) ||
opline->result.var == opline->op1.var)) {
src = VAR_SOURCE(opline->op1);
if (src) {
if (src->opcode == ZEND_BOOL ||
src->opcode == ZEND_QM_ASSIGN) {
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
++(*opt_count);
continue;
}
}
}
break;
}
break;
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
if (opline->op1_type == IS_CONST &&
opline->op2_type == IS_CONST) {
goto optimize_constant_binary_op;
}
if (opline->op2_type == IS_CONST &&
opline->op1_type == IS_TMP_VAR) {
src = VAR_SOURCE(opline->op1);
if (src &&
(src->opcode == ZEND_CONCAT ||
src->opcode == ZEND_FAST_CONCAT) &&
src->op2_type == IS_CONST) {
/* compress consecutive CONCATs */
size_t l, old_len;
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP2_LITERAL(opline));
}
if (Z_TYPE(ZEND_OP2_LITERAL(src)) != IS_STRING) {
convert_to_string(&ZEND_OP2_LITERAL(src));
}
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
old_len = Z_STRLEN(ZEND_OP2_LITERAL(src));
l = old_len + Z_STRLEN(ZEND_OP2_LITERAL(opline));
if (!Z_REFCOUNTED(ZEND_OP2_LITERAL(src))) {
zend_string *tmp = zend_string_alloc(l, 0);
memcpy(ZSTR_VAL(tmp), Z_STRVAL(ZEND_OP2_LITERAL(src)), old_len);
Z_STR(ZEND_OP2_LITERAL(src)) = tmp;
} else {
Z_STR(ZEND_OP2_LITERAL(src)) = zend_string_extend(Z_STR(ZEND_OP2_LITERAL(src)), l, 0);
}
Z_TYPE_INFO(ZEND_OP2_LITERAL(src)) = IS_STRING_EX;
memcpy(Z_STRVAL(ZEND_OP2_LITERAL(src)) + old_len, Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)));
Z_STRVAL(ZEND_OP2_LITERAL(src))[l] = '\0';
zval_ptr_dtor_str(&ZEND_OP2_LITERAL(opline));
ZVAL_STR(&ZEND_OP2_LITERAL(opline), zend_new_interned_string(Z_STR(ZEND_OP2_LITERAL(src))));
ZVAL_NULL(&ZEND_OP2_LITERAL(src));
MAKE_NOP(src);
++(*opt_count);
}
}
if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
src = VAR_SOURCE(opline->op1);
if (src &&
src->opcode == ZEND_CAST &&
src->extended_value == IS_STRING &&
src->op1_type != IS_CONST) {
/* convert T1 = CAST(STRING, X), T2 = CONCAT(T1, Y) to T2 = CONCAT(X,Y) */
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
++(*opt_count);
}
}
if (opline->op2_type & (IS_TMP_VAR|IS_VAR)) {
src = VAR_SOURCE(opline->op2);
if (src &&
src->opcode == ZEND_CAST &&
src->extended_value == IS_STRING &&
src->op1_type != IS_CONST) {
/* convert T1 = CAST(STRING, X), T2 = CONCAT(Y, T1) to T2 = CONCAT(Y,X) */
zend_op *src = VAR_SOURCE(opline->op2);
VAR_SOURCE(opline->op2) = NULL;
COPY_NODE(opline->op2, src->op1);
MAKE_NOP(src);
++(*opt_count);
}
}
if (opline->op1_type == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING &&
Z_STRLEN(ZEND_OP1_LITERAL(opline)) == 0) {
/* convert CONCAT('', X) => CAST(STRING, X) */
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->opcode = ZEND_CAST;
opline->extended_value = IS_STRING;
COPY_NODE(opline->op1, opline->op2);
opline->op2_type = IS_UNUSED;
opline->op2.var = 0;
++(*opt_count);
} else if (opline->op2_type == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING &&
Z_STRLEN(ZEND_OP2_LITERAL(opline)) == 0) {
/* convert CONCAT(X, '') => CAST(STRING, X) */
literal_dtor(&ZEND_OP2_LITERAL(opline));
opline->opcode = ZEND_CAST;
opline->extended_value = IS_STRING;
opline->op2_type = IS_UNUSED;
opline->op2.var = 0;
++(*opt_count);
} else if (opline->opcode == ZEND_CONCAT &&
(opline->op1_type == IS_CONST ||
(opline->op1_type == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
(VAR_SOURCE(opline->op1)->opcode == ZEND_FAST_CONCAT ||
VAR_SOURCE(opline->op1)->opcode == ZEND_ROPE_END ||
VAR_SOURCE(opline->op1)->opcode == ZEND_FETCH_CONSTANT ||
VAR_SOURCE(opline->op1)->opcode == ZEND_FETCH_CLASS_CONSTANT))) &&
(opline->op2_type == IS_CONST ||
(opline->op2_type == IS_TMP_VAR &&
VAR_SOURCE(opline->op2) &&
(VAR_SOURCE(opline->op2)->opcode == ZEND_FAST_CONCAT ||
VAR_SOURCE(opline->op2)->opcode == ZEND_ROPE_END ||
VAR_SOURCE(opline->op2)->opcode == ZEND_FETCH_CONSTANT ||
VAR_SOURCE(opline->op2)->opcode == ZEND_FETCH_CLASS_CONSTANT)))) {
opline->opcode = ZEND_FAST_CONCAT;
++(*opt_count);
}
break;
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_MOD:
case ZEND_SL:
case ZEND_SR:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_BOOL_XOR:
case ZEND_BW_OR:
case ZEND_BW_AND:
case ZEND_BW_XOR:
if (opline->op1_type == IS_CONST &&
opline->op2_type == IS_CONST) {
/* evaluate constant expressions */
zval result;
optimize_constant_binary_op:
if (zend_optimizer_eval_binary_op(&result, opline->opcode, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &result);
++(*opt_count);
}
}
break;
case ZEND_BW_NOT:
if (opline->op1_type == IS_CONST) {
/* evaluate constant unary ops */
zval result;
optimize_const_unary_op:
if (zend_optimizer_eval_unary_op(&result, opline->opcode, &ZEND_OP1_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->opcode = ZEND_QM_ASSIGN;
zend_optimizer_update_op1_const(op_array, opline, &result);
++(*opt_count);
}
}
break;
case ZEND_CAST:
if (opline->op1_type == IS_CONST) {
/* cast of constant operand */
zval result;
if (zend_optimizer_eval_cast(&result, opline->extended_value, &ZEND_OP1_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
zend_optimizer_update_op1_const(op_array, opline, &result);
++(*opt_count);
}
}
break;
case ZEND_STRLEN:
if (opline->op1_type == IS_CONST) {
zval result;
if (zend_optimizer_eval_strlen(&result, &ZEND_OP1_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->opcode = ZEND_QM_ASSIGN;
zend_optimizer_update_op1_const(op_array, opline, &result);
++(*opt_count);
}
}
break;
case ZEND_RETURN:
if (opline->op1_type == IS_TMP_VAR) {
src = VAR_SOURCE(opline->op1);
if (src && src->opcode == ZEND_QM_ASSIGN) {
zend_op *op = src + 1;
bool optimize = 1;
while (op < opline) {
if ((op->op1_type == opline->op1_type
&& op->op1.var == opline->op1.var)
|| (op->op2_type == opline->op1_type
&& op->op2.var == opline->op1.var)) {
optimize = 0;
break;
}
op++;
}
if (optimize) {
/* T = QM_ASSIGN(X), RETURN(T) to NOP, RETURN(X) */
VAR_SOURCE(opline->op1) = NULL;
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
++(*opt_count);
}
}
}
break;
case ZEND_QM_ASSIGN:
if (opline->op1_type == opline->result_type &&
opline->op1.var == opline->result.var) {
/* strip T = QM_ASSIGN(T) */
MAKE_NOP(opline);
++(*opt_count);
} else if (opline->op1_type == IS_TMP_VAR &&
opline->result_type == IS_TMP_VAR &&
!zend_bitset_in(used_ext, VAR_NUM(opline->op1.var))) {
/* T1 = ..., T2 = QM_ASSIGN(T1) to T2 = ..., NOP */
src = VAR_SOURCE(opline->op1);
if (src &&
src->opcode != ZEND_COPY_TMP &&
src->opcode != ZEND_ADD_ARRAY_ELEMENT &&
src->opcode != ZEND_ADD_ARRAY_UNPACK &&
(src->opcode != ZEND_DECLARE_LAMBDA_FUNCTION ||
src == opline -1)) {
src->result.var = opline->result.var;
VAR_SOURCE(opline->op1) = NULL;
VAR_SOURCE(opline->result) = src;
MAKE_NOP(opline);
++(*opt_count);
}
}
break;
}
/* get variable source */
if (opline->result_type & (IS_VAR|IS_TMP_VAR)) {
SET_VAR_SOURCE(opline);
}
opline++;
}
}
/* Rebuild plain (optimized) op_array from CFG */
static void assemble_code_blocks(zend_cfg *cfg, zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
zend_basic_block *blocks = cfg->blocks;
zend_basic_block *end = blocks + cfg->blocks_count;
zend_basic_block *b;
zend_op *new_opcodes;
zend_op *opline;
uint32_t len = 0;
for (b = blocks; b < end; b++) {
if (b->len == 0) {
continue;
}
if (b->flags & (ZEND_BB_REACHABLE|ZEND_BB_UNREACHABLE_FREE)) {
opline = op_array->opcodes + b->start + b->len - 1;
if (opline->opcode == ZEND_JMP) {
zend_basic_block *next = b + 1;
while (next < end && !(next->flags & ZEND_BB_REACHABLE)) {
next++;
}
if (next < end && next == blocks + b->successors[0]) {
/* JMP to the next block - strip it */
MAKE_NOP(opline);
b->len--;
}
} else if (b->len == 1 && opline->opcode == ZEND_NOP) {
/* skip empty block */
b->len--;
}
len += b->len;
} else {
/* this block will not be used, delete all constants there */
zend_op *op = op_array->opcodes + b->start;
zend_op *end = op + b->len;
for (; op < end; op++) {
if (op->op1_type == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(op));
}
if (op->op2_type == IS_CONST) {
literal_dtor(&ZEND_OP2_LITERAL(op));
}
}
}
}
new_opcodes = emalloc(len * sizeof(zend_op));
opline = new_opcodes;
/* Copy code of reachable blocks into a single buffer */
for (b = blocks; b < end; b++) {
if (b->flags & (ZEND_BB_REACHABLE|ZEND_BB_UNREACHABLE_FREE)) {
memcpy(opline, op_array->opcodes + b->start, b->len * sizeof(zend_op));
b->start = opline - new_opcodes;
opline += b->len;
}
}
/* adjust jump targets */
efree(op_array->opcodes);
op_array->opcodes = new_opcodes;
op_array->last = len;
for (b = blocks; b < end; b++) {
if (!(b->flags & ZEND_BB_REACHABLE) || b->len == 0) {
continue;
}
opline = op_array->opcodes + b->start + b->len - 1;
switch (opline->opcode) {
case ZEND_FAST_CALL:
case ZEND_JMP:
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, new_opcodes + blocks[b->successors[0]].start);
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
case ZEND_JMP_NULL:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, new_opcodes + blocks[b->successors[0]].start);
break;
case ZEND_CATCH:
if (!(opline->extended_value & ZEND_LAST_CATCH)) {
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, new_opcodes + blocks[b->successors[0]].start);
}
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, new_opcodes + blocks[b->successors[0]].start);
break;
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
{
HashTable *jumptable = Z_ARRVAL(ZEND_OP2_LITERAL(opline));
zval *zv;
uint32_t s = 0;
ZEND_ASSERT(b->successors_count == (opline->opcode == ZEND_MATCH ? 1 : 2) + zend_hash_num_elements(jumptable));
ZEND_HASH_FOREACH_VAL(jumptable, zv) {
Z_LVAL_P(zv) = ZEND_OPLINE_TO_OFFSET(opline, new_opcodes + blocks[b->successors[s++]].start);
} ZEND_HASH_FOREACH_END();
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, new_opcodes + blocks[b->successors[s++]].start);
break;
}
}
}
/* adjust exception jump targets & remove unused try_catch_array entries */
if (op_array->last_try_catch) {
int i, j;
uint32_t *map;
ALLOCA_FLAG(use_heap);
map = (uint32_t *)do_alloca(sizeof(uint32_t) * op_array->last_try_catch, use_heap);
for (i = 0, j = 0; i< op_array->last_try_catch; i++) {
if (blocks[cfg->map[op_array->try_catch_array[i].try_op]].flags & ZEND_BB_REACHABLE) {
map[i] = j;
op_array->try_catch_array[j].try_op = blocks[cfg->map[op_array->try_catch_array[i].try_op]].start;
if (op_array->try_catch_array[i].catch_op) {
op_array->try_catch_array[j].catch_op = blocks[cfg->map[op_array->try_catch_array[i].catch_op]].start;
} else {
op_array->try_catch_array[j].catch_op = 0;
}
if (op_array->try_catch_array[i].finally_op) {
op_array->try_catch_array[j].finally_op = blocks[cfg->map[op_array->try_catch_array[i].finally_op]].start;
} else {
op_array->try_catch_array[j].finally_op = 0;
}
if (!op_array->try_catch_array[i].finally_end) {
op_array->try_catch_array[j].finally_end = 0;
} else {
op_array->try_catch_array[j].finally_end = blocks[cfg->map[op_array->try_catch_array[i].finally_end]].start;
}
j++;
}
}
if (i != j) {
op_array->last_try_catch = j;
if (j == 0) {
efree(op_array->try_catch_array);
op_array->try_catch_array = NULL;
}
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
zend_op *opline = new_opcodes;
zend_op *end = opline + len;
while (opline < end) {
if (opline->opcode == ZEND_FAST_RET &&
opline->op2.num != (uint32_t)-1 &&
opline->op2.num < (uint32_t)j) {
opline->op2.num = map[opline->op2.num];
}
opline++;
}
}
}
free_alloca(map, use_heap);
}
/* rebuild map (just for printing) */
memset(cfg->map, -1, sizeof(int) * op_array->last);
for (int n = 0; n < cfg->blocks_count; n++) {
if (cfg->blocks[n].flags & (ZEND_BB_REACHABLE|ZEND_BB_UNREACHABLE_FREE)) {
cfg->map[cfg->blocks[n].start] = n;
}
}
}
static zend_always_inline zend_basic_block *get_target_block(const zend_cfg *cfg, zend_basic_block *block, int n, uint32_t *opt_count)
{
int b;
zend_basic_block *target_block = cfg->blocks + block->successors[n];
if (target_block->len == 0 && !(target_block->flags & ZEND_BB_PROTECTED)) {
do {
b = target_block->successors[0];
target_block = cfg->blocks + b;
} while (target_block->len == 0 && !(target_block->flags & ZEND_BB_PROTECTED));
block->successors[n] = b;
++(*opt_count);
}
return target_block;
}
static zend_always_inline zend_basic_block *get_follow_block(const zend_cfg *cfg, zend_basic_block *block, int n, uint32_t *opt_count)
{
int b;
zend_basic_block *target_block = cfg->blocks + block->successors[n];
if (target_block->len == 0 && !(target_block->flags & ZEND_BB_PROTECTED)) {
do {
b = target_block->successors[0];
target_block = cfg->blocks + b;
} while (target_block->len == 0 && !(target_block->flags & ZEND_BB_PROTECTED));
block->successors[n] = b;
++(*opt_count);
}
return target_block;
}
static zend_always_inline zend_basic_block *get_next_block(const zend_cfg *cfg, zend_basic_block *block)
{
zend_basic_block *next_block = block + 1;
zend_basic_block *end = cfg->blocks + cfg->blocks_count;
while (1) {
if (next_block == end) {
return NULL;
} else if (next_block->flags & ZEND_BB_REACHABLE) {
break;
}
next_block++;
}
while (next_block->len == 0 && !(next_block->flags & ZEND_BB_PROTECTED)) {
next_block = cfg->blocks + next_block->successors[0];
}
return next_block;
}
/* we use "jmp_hitlist" to avoid infinity loops during jmp optimization */
static zend_always_inline bool in_hitlist(int target, int *jmp_hitlist, int jmp_hitlist_count)
{
int i;
for (i = 0; i < jmp_hitlist_count; i++) {
if (jmp_hitlist[i] == target) {
return 1;
}
}
return 0;
}
#define CHECK_LOOP(target) \
if (EXPECTED(!in_hitlist(target, jmp_hitlist, jmp_hitlist_count))) { \
jmp_hitlist[jmp_hitlist_count++] = target; \
} else { \
break; \
}
static void zend_jmp_optimization(zend_basic_block *block, zend_op_array *op_array, const zend_cfg *cfg, int *jmp_hitlist, uint32_t *opt_count)
{
/* last_op is the last opcode of the current block */
zend_basic_block *target_block, *follow_block, *next_block;
zend_op *last_op, *target;
int next, jmp_hitlist_count;
if (block->len == 0) {
return;
}
last_op = op_array->opcodes + block->start + block->len - 1;
switch (last_op->opcode) {
case ZEND_JMP:
jmp_hitlist_count = 0;
target_block = get_target_block(cfg, block, 0, opt_count);
while (target_block->len == 1) {
target = op_array->opcodes + target_block->start;
if (target->opcode == ZEND_JMP) {
/* JMP L, L: JMP L1 -> JMP L1 */
next = target_block->successors[0];
} else {
break;
}
CHECK_LOOP(next);
block->successors[0] = next;
++(*opt_count);
target_block = get_target_block(cfg, block, 0, opt_count);
}
next_block = get_next_block(cfg, block);
if (target_block == next_block) {
/* JMP(next) -> NOP */
MAKE_NOP(last_op);
++(*opt_count);
block->len--;
} else if (target_block->len == 1) {
target = op_array->opcodes + target_block->start;
if ((target->opcode == ZEND_RETURN ||
target->opcode == ZEND_RETURN_BY_REF ||
target->opcode == ZEND_GENERATOR_RETURN) &&
!(op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK)) {
/* JMP L, L: RETURN to immediate RETURN */
*last_op = *target;
if (last_op->op1_type == IS_CONST) {
zval zv;
ZVAL_COPY(&zv, &ZEND_OP1_LITERAL(last_op));
last_op->op1.constant = zend_optimizer_add_literal(op_array, &zv);
}
block->successors_count = 0;
++(*opt_count);
}
}
break;
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_JMP_NULL:
jmp_hitlist_count = 0;
target_block = get_target_block(cfg, block, 0, opt_count);
while (target_block->len == 1) {
target = op_array->opcodes + target_block->start;
if (target->opcode == ZEND_JMP) {
/* JMP_SET(X, L), L: JMP(L2) -> JMP_SET(X, L2) */
next = target_block->successors[0];
CHECK_LOOP(next);
block->successors[0] = next;
++(*opt_count);
} else {
break;
}
target_block = get_target_block(cfg, block, 0, opt_count);
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
jmp_hitlist_count = 0;
target_block = get_target_block(cfg, block, 0, opt_count);
while (target_block->len == 1) {
target = op_array->opcodes + target_block->start;
if (target->opcode == ZEND_JMP) {
/* JMPZ(X, L), L: JMP(L2) -> JMPZ(X, L2) */
next = target_block->successors[0];
} else if (target->opcode == last_op->opcode &&
SAME_VAR(target->op1, last_op->op1)) {
/* JMPZ(X, L), L: JMPZ(X, L2) -> JMPZ(X, L2) */
next = target_block->successors[0];
} else if (target->opcode == INV_COND(last_op->opcode) &&
SAME_VAR(target->op1, last_op->op1)) {
/* JMPZ(X, L), L: JMPNZ(X, L2) -> JMPZ(X, L+1) */
next = target_block->successors[1];
} else {
break;
}
CHECK_LOOP(next);
block->successors[0] = next;
++(*opt_count);
target_block = get_target_block(cfg, block, 0, opt_count);
}
follow_block = get_follow_block(cfg, block, 1, opt_count);
if (target_block == follow_block) {
/* L: JMP[N]Z(X, L+1) -> NOP or FREE(X) */
zend_optimizer_convert_to_free_op1(op_array, last_op);
if (last_op->opcode == ZEND_NOP) {
block->len--;
}
block->successors_count = 1;
++(*opt_count);
} else if (follow_block->len == 1) {
target = op_array->opcodes + follow_block->start;
if (target->opcode == ZEND_JMP) {
if (block->successors[0] == follow_block->successors[0]) {
/* JMPZ(X,L1), JMP(L1) -> NOP, JMP(L1) */
zend_optimizer_convert_to_free_op1(op_array, last_op);
if (last_op->opcode == ZEND_NOP) {
block->len--;
}
block->successors[0] = follow_block - cfg->blocks;
block->successors_count = 1;
++(*opt_count);
break;
} else if (!(follow_block->flags & (ZEND_BB_TARGET | ZEND_BB_PROTECTED))) {
next_block = get_next_block(cfg, follow_block);
if (target_block == next_block) {
/* JMPZ(X,L1) JMP(L2) L1: -> JMPNZ(X,L2) NOP*/
last_op->opcode = INV_COND(last_op->opcode);
block->successors[0] = follow_block->successors[0];
block->successors[1] = next_block - cfg->blocks;
follow_block->flags &= ~ZEND_BB_REACHABLE;
MAKE_NOP(target);
follow_block->len = 0;
next_block->flags |= ZEND_BB_FOLLOW;
break;
}
}
}
}
break;
case ZEND_JMPNZ_EX:
case ZEND_JMPZ_EX:
jmp_hitlist_count = 0;
target_block = get_target_block(cfg, block, 0, opt_count);
while (target_block->len == 1) {
target = op_array->opcodes + target_block->start;
if (target->opcode == ZEND_JMP) {
/* T = JMPZ_EX(X, L), L: JMP(L2) -> T = JMPZ(X, L2) */
next = target_block->successors[0];
} else if (target->opcode == last_op->opcode-3 &&
(SAME_VAR(target->op1, last_op->result) ||
SAME_VAR(target->op1, last_op->op1))) {
/* T = JMPZ_EX(X, L1), L1: JMPZ({X|T}, L2) -> T = JMPZ_EX(X, L2) */
next = target_block->successors[0];
} else if (target->opcode == last_op->opcode &&
target->result.var == last_op->result.var &&
(SAME_VAR(target->op1, last_op->result) ||
SAME_VAR(target->op1, last_op->op1))) {
/* T = JMPZ_EX(X, L1), L1: T = JMPZ_EX({X|T}, L2) -> T = JMPZ_EX(X, L2) */
next = target_block->successors[0];
} else if (target->opcode == INV_EX_COND(last_op->opcode) &&
(SAME_VAR(target->op1, last_op->result) ||
SAME_VAR(target->op1, last_op->op1))) {
/* T = JMPZ_EX(X, L1), L1: JMPNZ({X|T1}, L2) -> T = JMPZ_EX(X, L1+1) */
next = target_block->successors[1];
} else if (target->opcode == INV_EX_COND_EX(last_op->opcode) &&
target->result.var == last_op->result.var &&
(SAME_VAR(target->op1, last_op->result) ||
SAME_VAR(target->op1, last_op->op1))) {
/* T = JMPZ_EX(X, L1), L1: T = JMPNZ_EX({X|T}, L2) -> T = JMPZ_EX(X, L1+1) */
next = target_block->successors[1];
} else if (target->opcode == ZEND_BOOL &&
(SAME_VAR(target->op1, last_op->result) ||
SAME_VAR(target->op1, last_op->op1))) {
/* convert Y = JMPZ_EX(X,L1), L1: Z = BOOL(Y) to
Z = JMPZ_EX(X,L1+1) */
/* NOTE: This optimization pattern is not safe, but works, */
/* because result of JMPZ_EX instruction */
/* is not used on the following path and */
/* should be used once on the branch path. */
/* */
/* The pattern works well only if jumps processed in */
/* direct order, otherwise it breaks JMPZ_EX */
/* sequences too early. */
last_op->result.var = target->result.var;
next = target_block->successors[0];
} else {
break;
}
CHECK_LOOP(next);
block->successors[0] = next;
++(*opt_count);
target_block = get_target_block(cfg, block, 0, opt_count);
}
follow_block = get_follow_block(cfg, block, 1, opt_count);
if (target_block == follow_block) {
/* L: T = JMP[N]Z_EX(X, L+1) -> T = BOOL(X) */
last_op->opcode = ZEND_BOOL;
last_op->op2.num = 0;
block->successors_count = 1;
++(*opt_count);
break;
}
break;
}
}
/* Global data dependencies */
/* Find a set of variables which are used outside of the block where they are
* defined. We won't apply some optimization patterns for such variables. */
static void zend_t_usage(zend_cfg *cfg, zend_op_array *op_array, zend_bitset used_ext, zend_optimizer_ctx *ctx)
{
int n;
zend_basic_block *block, *next_block;
uint32_t var_num;
uint32_t bitset_len;
zend_bitset usage;
zend_bitset defined_here;
void *checkpoint;
zend_op *opline, *end;
if (op_array->T == 0) {
/* shortcut - if no Ts, nothing to do */
return;
}
checkpoint = zend_arena_checkpoint(ctx->arena);
bitset_len = zend_bitset_len(op_array->last_var + op_array->T);
defined_here = zend_arena_alloc(&ctx->arena, bitset_len * ZEND_BITSET_ELM_SIZE);
zend_bitset_clear(defined_here, bitset_len);
for (n = 1; n < cfg->blocks_count; n++) {
block = cfg->blocks + n;
if (!(block->flags & ZEND_BB_REACHABLE)) {
continue;
}
opline = op_array->opcodes + block->start;
end = opline + block->len;
if (!(block->flags & ZEND_BB_FOLLOW) ||
(block->flags & ZEND_BB_TARGET)) {
/* Skip continuation of "extended" BB */
zend_bitset_clear(defined_here, bitset_len);
}
while (opline<end) {
if (opline->op1_type & (IS_VAR|IS_TMP_VAR)) {
var_num = VAR_NUM(opline->op1.var);
if (!zend_bitset_in(defined_here, var_num)) {
zend_bitset_incl(used_ext, var_num);
}
}
if (opline->op2_type == IS_VAR) {
var_num = VAR_NUM(opline->op2.var);
if (opline->opcode == ZEND_FE_FETCH_R ||
opline->opcode == ZEND_FE_FETCH_RW) {
/* these opcode use the op2 as result */
zend_bitset_incl(defined_here, var_num);
} else if (!zend_bitset_in(defined_here, var_num)) {
zend_bitset_incl(used_ext, var_num);
}
} else if (opline->op2_type == IS_TMP_VAR) {
var_num = VAR_NUM(opline->op2.var);
if (!zend_bitset_in(defined_here, var_num)) {
zend_bitset_incl(used_ext, var_num);
}
}
if (opline->result_type == IS_VAR) {
var_num = VAR_NUM(opline->result.var);
zend_bitset_incl(defined_here, var_num);
} else if (opline->result_type == IS_TMP_VAR) {
var_num = VAR_NUM(opline->result.var);
switch (opline->opcode) {
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_ADD_ARRAY_UNPACK:
case ZEND_ROPE_ADD:
/* these opcodes use the result as argument */
if (!zend_bitset_in(defined_here, var_num)) {
zend_bitset_incl(used_ext, var_num);
}
break;
default :
zend_bitset_incl(defined_here, var_num);
}
}
opline++;
}
}
if (ctx->debug_level & ZEND_DUMP_BLOCK_PASS_VARS) {
bool printed = 0;
uint32_t i;
for (i = op_array->last_var; i< op_array->T; i++) {
if (zend_bitset_in(used_ext, i)) {
if (!printed) {
fprintf(stderr, "NON-LOCAL-VARS: %d", i);
printed = 1;
} else {
fprintf(stderr, ", %d", i);
}
}
}
if (printed) {
fprintf(stderr, "\n");
}
}
usage = defined_here;
next_block = NULL;
for (n = cfg->blocks_count; n > 0;) {
block = cfg->blocks + (--n);
if (!(block->flags & ZEND_BB_REACHABLE) || block->len == 0) {
continue;
}
end = op_array->opcodes + block->start;
opline = end + block->len - 1;
if (!next_block ||
!(next_block->flags & ZEND_BB_FOLLOW) ||
(next_block->flags & ZEND_BB_TARGET)) {
/* Skip continuation of "extended" BB */
zend_bitset_copy(usage, used_ext, bitset_len);
} else if (block->successors_count > 1) {
zend_bitset_union(usage, used_ext, bitset_len);
}
next_block = block;
while (opline >= end) {
/* usage checks */
if (opline->result_type & (IS_VAR|IS_TMP_VAR)) {
if (!zend_bitset_in(usage, VAR_NUM(opline->result.var))) {
switch (opline->opcode) {
case ZEND_ASSIGN_OP:
case ZEND_ASSIGN_DIM_OP:
case ZEND_ASSIGN_OBJ_OP:
case ZEND_ASSIGN_STATIC_PROP_OP:
case ZEND_PRE_INC:
case ZEND_PRE_DEC:
case ZEND_ASSIGN:
case ZEND_ASSIGN_REF:
case ZEND_DO_FCALL:
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
opline->result_type = IS_UNUSED;
break;
case ZEND_POST_INC:
case ZEND_POST_DEC:
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
case ZEND_POST_INC_STATIC_PROP:
case ZEND_POST_DEC_STATIC_PROP:
opline->opcode -= 2;
opline->result_type = IS_UNUSED;
break;
case ZEND_QM_ASSIGN:
case ZEND_BOOL:
case ZEND_BOOL_NOT:
zend_optimizer_convert_to_free_op1(op_array, opline);
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
opline->opcode -= 3;
SET_UNUSED(opline->result);
break;
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_ADD_ARRAY_UNPACK:
case ZEND_ROPE_ADD:
zend_bitset_incl(usage, VAR_NUM(opline->result.var));
break;
}
} else {
switch (opline->opcode) {
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_ADD_ARRAY_UNPACK:
case ZEND_ROPE_ADD:
break;
default:
zend_bitset_excl(usage, VAR_NUM(opline->result.var));
break;
}
}
}
if (opline->op2_type == IS_VAR) {
switch (opline->opcode) {
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
zend_bitset_excl(usage, VAR_NUM(opline->op2.var));
break;
default:
zend_bitset_incl(usage, VAR_NUM(opline->op2.var));
break;
}
} else if (opline->op2_type == IS_TMP_VAR) {
zend_bitset_incl(usage, VAR_NUM(opline->op2.var));
}
if (opline->op1_type & (IS_VAR|IS_TMP_VAR)) {
zend_bitset_incl(usage, VAR_NUM(opline->op1.var));
}
opline--;
}
}
zend_arena_release(&ctx->arena, checkpoint);
}
static void zend_merge_blocks(zend_op_array *op_array, zend_cfg *cfg, uint32_t *opt_count)
{
int i;
zend_basic_block *b, *bb;
zend_basic_block *prev = NULL;
for (i = 0; i < cfg->blocks_count; i++) {
b = cfg->blocks + i;
if (b->flags & ZEND_BB_REACHABLE) {
if ((b->flags & ZEND_BB_FOLLOW) &&
!(b->flags & (ZEND_BB_TARGET | ZEND_BB_PROTECTED)) &&
prev && prev->successors_count == 1 && prev->successors[0] == i)
{
zend_op *last_op = op_array->opcodes + prev->start + prev->len - 1;
if (prev->len != 0 && last_op->opcode == ZEND_JMP) {
MAKE_NOP(last_op);
}
for (bb = prev + 1; bb != b; bb++) {
zend_op *op = op_array->opcodes + bb->start;
zend_op *end = op + bb->len;
while (op < end) {
if (op->op1_type == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(op));
}
if (op->op2_type == IS_CONST) {
literal_dtor(&ZEND_OP2_LITERAL(op));
}
MAKE_NOP(op);
op++;
}
/* make block empty */
bb->len = 0;
}
/* re-link */
prev->flags |= (b->flags & ZEND_BB_EXIT);
prev->len = b->start + b->len - prev->start;
prev->successors_count = b->successors_count;
if (b->successors != b->successors_storage) {
prev->successors = b->successors;
b->successors = b->successors_storage;
} else {
memcpy(prev->successors, b->successors, b->successors_count * sizeof(int));
}
/* unlink & make block empty and unreachable */
b->flags = 0;
b->len = 0;
b->successors_count = 0;
++(*opt_count);
} else {
prev = b;
}
}
}
}
#define PASSES 3
void zend_optimize_cfg(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
zend_cfg cfg;
zend_basic_block *blocks, *end, *b;
int pass;
uint32_t bitset_len;
zend_bitset usage;
void *checkpoint;
zend_op **Tsource;
uint32_t opt_count;
int *jmp_hitlist;
/* Build CFG */
checkpoint = zend_arena_checkpoint(ctx->arena);
zend_build_cfg(&ctx->arena, op_array, 0, &cfg);
if (cfg.blocks_count * (op_array->last_var + op_array->T) > 64 * 1024 * 1024) {
zend_arena_release(&ctx->arena, checkpoint);
return;
}
if (ctx->debug_level & ZEND_DUMP_BEFORE_BLOCK_PASS) {
zend_dump_op_array(op_array, ZEND_DUMP_CFG, "before block pass", &cfg);
}
bitset_len = zend_bitset_len(op_array->last_var + op_array->T);
Tsource = zend_arena_calloc(&ctx->arena, op_array->last_var + op_array->T, sizeof(zend_op *));
usage = zend_arena_alloc(&ctx->arena, bitset_len * ZEND_BITSET_ELM_SIZE);
jmp_hitlist = zend_arena_alloc(&ctx->arena, cfg.blocks_count * sizeof(int));
blocks = cfg.blocks;
end = blocks + cfg.blocks_count;
for (pass = 0; pass < PASSES; pass++) {
opt_count = 0;
/* Compute data dependencies */
zend_bitset_clear(usage, bitset_len);
zend_t_usage(&cfg, op_array, usage, ctx);
/* optimize each basic block separately */
for (b = blocks; b < end; b++) {
if (!(b->flags & ZEND_BB_REACHABLE)) {
continue;
}
/* we track data dependencies only inside a single basic block */
if (!(b->flags & ZEND_BB_FOLLOW) ||
(b->flags & ZEND_BB_TARGET)) {
/* Skip continuation of "extended" BB */
memset(Tsource, 0, (op_array->last_var + op_array->T) * sizeof(zend_op *));
}
zend_optimize_block(b, op_array, usage, &cfg, Tsource, &opt_count);
}
/* Eliminate NOPs */
for (b = blocks; b < end; b++) {
if (b->flags & ZEND_BB_UNREACHABLE_FREE) {
/* In unreachable_free blocks only preserve loop var frees. */
for (uint32_t i = b->start; i < b->start + b->len; i++) {
zend_op *opline = &op_array->opcodes[i];
if (!zend_optimizer_is_loop_var_free(opline)) {
MAKE_NOP(opline);
}
}
}
if (b->flags & (ZEND_BB_REACHABLE|ZEND_BB_UNREACHABLE_FREE)) {
strip_nops(op_array, b);
}
}
opt_count = 0;
/* Jump optimization for each block */
for (b = blocks; b < end; b++) {
if (b->flags & ZEND_BB_REACHABLE) {
zend_jmp_optimization(b, op_array, &cfg, jmp_hitlist, &opt_count);
}
}
/* Eliminate unreachable basic blocks */
zend_cfg_remark_reachable_blocks(op_array, &cfg);
/* Merge Blocks */
zend_merge_blocks(op_array, &cfg, &opt_count);
if (opt_count == 0) {
break;
}
}
assemble_code_blocks(&cfg, op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_BLOCK_PASS) {
zend_dump_op_array(op_array, ZEND_DUMP_CFG | ZEND_DUMP_HIDE_UNREACHABLE, "after block pass", &cfg);
}
/* Destroy CFG */
zend_arena_release(&ctx->arena, checkpoint);
}