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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_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_IDENTICAL:
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++) {