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XCache is a fast, stable PHP opcode cacher that has been proven and is now running on production servers under high load. https://xcache.lighttpd.net/
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xcache/mod_optimizer/xc_optimizer.c

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#if 0
# define XCACHE_DEBUG
#endif
#include "xc_optimizer.h"
#include "xcache/xc_extension.h"
#include "xcache/xc_ini.h"
#include "xcache/xc_utils.h"
#include "util/xc_stack.h"
#include "util/xc_trace.h"
#include "xcache_globals.h"
#include "ext/standard/info.h"
#ifdef XCACHE_DEBUG
#error 1
# include "xc_processor.h"
# include "xcache/xc_const_string.h"
# include "ext/standard/php_var.h"
#endif
#ifdef IS_CV
# define XCACHE_IS_CV IS_CV
#else
# define XCACHE_IS_CV 16
#endif
#ifdef ZEND_ENGINE_2_4
# undef Z_OP_CONSTANT
/* Z_OP_CONSTANT is used before pass_two is applied */
# define Z_OP_CONSTANT(op) op_array->literals[op.constant].constant
#endif
typedef zend_uint bbid_t;
#define BBID_INVALID ((bbid_t) -1)
/* {{{ basic block */
typedef struct _bb_t {
bbid_t id;
zend_bool used;
zend_bool alloc;
zend_op *opcodes;
int count;
int size;
bbid_t fall;
#ifdef ZEND_ENGINE_2
bbid_t catch;
#endif
zend_uint opnum; /* opnum after joining basic block */
} bb_t;
/* }}} */
/* basic blocks */
typedef xc_stack_t bbs_t;
/* op array helper functions */
static int op_array_convert_switch(zend_op_array *op_array) /* {{{ */
{
zend_uint i;
if (op_array->brk_cont_array == NULL) {
return SUCCESS;
}
for (i = 0; i < op_array->last; i ++) {
zend_op *opline = &op_array->opcodes[i];
zend_brk_cont_element *jmp_to;
zend_bool can_convert = 1;
int array_offset, nest_levels, original_nest_levels;
switch (opline->opcode) {
case ZEND_BRK:
case ZEND_CONT:
break;
#ifdef ZEND_GOTO
case ZEND_GOTO:
#endif
continue;
default:
continue;
}
if (Z_OP_TYPE(opline->op2) != IS_CONST
|| Z_OP_CONSTANT(opline->op2).type != IS_LONG) {
return FAILURE;
}
nest_levels = Z_OP_CONSTANT(opline->op2).value.lval;
original_nest_levels = nest_levels;
array_offset = Z_OP(opline->op1).opline_num;
do {
if (array_offset == -1) {
/* this is a runtime error in ZE
zend_error(E_ERROR, "Cannot break/continue %d level%s", original_nest_levels, (original_nest_levels == 1) ? "" : "s");
*/
return FAILURE;
}
jmp_to = &op_array->brk_cont_array[array_offset];
if (nest_levels > 1) {
zend_op *brk_opline = &op_array->opcodes[jmp_to->brk];
switch (brk_opline->opcode) {
case ZEND_SWITCH_FREE:
case ZEND_FREE:
#ifdef EXT_TYPE_FREE_ON_RETURN
if (!(brk_opline->extended_value & EXT_TYPE_FREE_ON_RETURN))
#endif
{
can_convert = 0;
}
break;
}
}
array_offset = jmp_to->parent;
} while (--nest_levels > 0);
if (can_convert) {
/* rewrite to jmp */
switch (opline->opcode) {
case ZEND_BRK:
Z_OP(opline->op1).opline_num = jmp_to->brk;
break;
case ZEND_CONT:
Z_OP(opline->op1).opline_num = jmp_to->cont;
break;
}
Z_OP_TYPE(opline->op2) = IS_UNUSED;
opline->opcode = ZEND_JMP;
}
}
return SUCCESS;
}
/* }}} */
/* {{{ op_flowinfo helper func */
enum {
XC_OPNUM_INVALID = -1,
};
typedef struct {
int jmpout_op1;
int jmpout_op2;
int jmpout_ext;
zend_bool fall;
} op_flowinfo_t;
static void op_flowinfo_init(op_flowinfo_t *fi)
{
fi->jmpout_op1 = fi->jmpout_op2 = fi->jmpout_ext = XC_OPNUM_INVALID;
fi->fall = 0;
}
/* }}} */
static int op_get_flowinfo(op_flowinfo_t *fi, zend_op *opline) /* {{{ */
{
op_flowinfo_init(fi);
/* break=will fall */
switch (opline->opcode) {
#ifdef ZEND_HANDLE_EXCEPTION
case ZEND_HANDLE_EXCEPTION:
#endif
case ZEND_RETURN:
case ZEND_EXIT:
return SUCCESS; /* no fall */
case ZEND_JMP:
fi->jmpout_op1 = Z_OP(opline->op1).opline_num;
return SUCCESS; /* no fall */
case ZEND_JMPZNZ:
fi->jmpout_op2 = Z_OP(opline->op2).opline_num;
fi->jmpout_ext = (int) opline->extended_value;
return SUCCESS; /* no fall */
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
#ifdef ZEND_JMP_SET
case ZEND_JMP_SET:
#endif
#ifdef ZEND_JMP_NO_CTOR
case ZEND_JMP_NO_CTOR:
#endif
#ifdef ZEND_NEW
case ZEND_NEW:
#endif
#ifdef ZEND_FE_RESET
case ZEND_FE_RESET:
#endif
case ZEND_FE_FETCH:
fi->jmpout_op2 = Z_OP(opline->op2).opline_num;
break;
#ifdef ZEND_CATCH
case ZEND_CATCH:
fi->jmpout_ext = (int) opline->extended_value;
break;
#endif
default:
return FAILURE;
}
fi->fall = 1;
return SUCCESS;
}
/* }}} */
#ifdef XCACHE_DEBUG
static void op_snprint(char *buf, int size, zend_uchar op_type, znode_op *op) /* {{{ */
{
switch (op_type) {
case IS_CONST:
{
zval result;
zval *zv = &Z_OP_CONSTANT(*op);
TSRMLS_FETCH();
/* TODO: update for PHP 6 */
php_start_ob_buffer(NULL, 0, 1 TSRMLS_CC);
php_var_export(&zv, 1 TSRMLS_CC);
php_ob_get_buffer(&result TSRMLS_CC);
php_end_ob_buffer(0, 0 TSRMLS_CC);
snprintf(buf, size, Z_STRVAL(result));
zval_dtor(&result);
}
break;
case IS_TMP_VAR:
snprintf(buf, size, "t@%d", Z_OP(*op).var);
break;
case XCACHE_IS_CV:
case IS_VAR:
snprintf(buf, size, "v@%d", Z_OP(*op).var);
break;
case IS_UNUSED:
if (Z_OP(*op).opline_num) {
snprintf(buf, size, "u#%d", Z_OP(op).opline_num);
}
else {
snprintf(buf, size, "-");
}
break;
default:
snprintf(buf, size, "%d %d", op->op_type, Z_OP(op).var);
}
}
/* }}} */
static void op_print(int line, zend_op *first, zend_op *end) /* {{{ */
{
zend_op *opline;
for (opline = first; opline < end; opline ++) {
char buf_r[20];
char buf_1[20];
char buf_2[20];
op_snprint(buf_r, sizeof(buf_r), Z_OP_TYPE(opline->result), &opline->result);
op_snprint(buf_1, sizeof(buf_1), Z_OP_TYPE(opline->op1), &opline->op1);
op_snprint(buf_2, sizeof(buf_2), Z_OP_TYPE(opline->op2), &opline->op2);
fprintf(stderr,
"%3d %3d"
" %-25s%-5s%-20s%-20s%5lu\r\n"
, opline->lineno, opline - first + line
, xc_get_opcode(opline->opcode), buf_r, buf_1, buf_2, opline->extended_value);
}
}
/* }}} */
#endif
/*
* basic block functions
*/
static bb_t *bb_new_ex(zend_op *opcodes, int count) /* {{{ */
{
bb_t *bb = (bb_t *) ecalloc(sizeof(bb_t), 1);
bb->fall = BBID_INVALID;
#ifdef ZEND_ENGINE_2
bb->catch = BBID_INVALID;
#endif
if (opcodes) {
bb->alloc = 0;
bb->size = bb->count = count;
bb->opcodes = opcodes;
}
else {
bb->alloc = 1;
bb->size = bb->count = 8;
bb->opcodes = ecalloc(sizeof(zend_op), bb->size);
}
return bb;
}
/* }}} */
#define bb_new() bb_new_ex(NULL, 0)
static void bb_destroy(bb_t *bb) /* {{{ */
{
if (bb->alloc) {
efree(bb->opcodes);
}
efree(bb);
}
/* }}} */
#ifdef XCACHE_DEBUG
static void bb_print(bb_t *bb, zend_op *opcodes) /* {{{ */
{
int line = bb->opcodes - opcodes;
op_flowinfo_t fi;
zend_op *last = bb->opcodes + bb->count - 1;
bbid_t catchbbid;
#ifdef ZEND_ENGINE_2
catchbbid = BBID_INVALID;
#else
catchbbid = bb->catch;
#endif
op_get_flowinfo(&fi, last);
fprintf(stderr,
"\r\n==== #%-3d cnt:%-3d lno:%-3d"
" %c%c"
" op1:%-3d op2:%-3d ext:%-3d fal:%-3d cat:%-3d %s ====\r\n"
, bb->id, bb->count, bb->alloc ? -1 : line
, bb->used ? 'U' : ' ', bb->alloc ? 'A' : ' '
, fi.jmpout_op1, fi.jmpout_op2, fi.jmpout_ext, bb->fall, catchbbid, xc_get_opcode(last->opcode)
);
op_print(line, bb->opcodes, last + 1);
}
/* }}} */
#endif
static bb_t *bbs_get(bbs_t *bbs, int n) /* {{{ */
{
return (bb_t *) xc_stack_get(bbs, n);
}
/* }}} */
static int bbs_count(bbs_t *bbs) /* {{{ */
{
return xc_stack_count(bbs);
}
/* }}} */
static void bbs_destroy(bbs_t *bbs) /* {{{ */
{
bb_t *bb;
while (bbs_count(bbs)) {
bb = (bb_t *) xc_stack_pop(bbs);
bb_destroy(bb);
}
xc_stack_destroy(bbs);
}
/* }}} */
#ifdef XCACHE_DEBUG
static void bbs_print(bbs_t *bbs, zend_op *opcodes) /* {{{ */
{
int i;
for (i = 0; i < xc_stack_count(bbs); i ++) {
bb_print(bbs_get(bbs, i), opcodes);
}
}
/* }}} */
#endif
#define bbs_init(bbs) xc_stack_init_ex(bbs, 16)
static bb_t *bbs_add_bb(bbs_t *bbs, bb_t *bb) /* {{{ */
{
bb->id = (bbid_t) xc_stack_count(bbs);
xc_stack_push(bbs, (void *) bb);
return bb;
}
/* }}} */
static bb_t *bbs_new_bb_ex(bbs_t *bbs, zend_op *opcodes, int count) /* {{{ */
{
return bbs_add_bb(bbs, bb_new_ex(opcodes, count));
}
/* }}} */
static int bbs_build_from(bbs_t *bbs, zend_op_array *op_array, int count) /* {{{ */
{
int i, start;
bb_t *pbb;
bbid_t id;
op_flowinfo_t fi;
zend_op *opline;
ALLOCA_FLAG(use_heap_bbids)
ALLOCA_FLAG(use_heap_catchbbids)
ALLOCA_FLAG(use_heap_markbbhead)
bbid_t *bbids = my_do_alloca(count * sizeof(bbid_t), use_heap_bbids);
#ifdef ZEND_ENGINE_2
bbid_t *catchbbids = my_do_alloca(count * sizeof(bbid_t), use_heap_catchbbids);
#endif
zend_bool *markbbhead = my_do_alloca(count * sizeof(zend_bool), use_heap_markbbhead);
/* {{{ mark jmpin/jumpout */
memset(markbbhead, 0, count * sizeof(zend_bool));
markbbhead[0] = 1;
for (i = 0; i < count; i ++) {
if (op_get_flowinfo(&fi, &op_array->opcodes[i]) == SUCCESS) {
if (fi.jmpout_op1 != XC_OPNUM_INVALID) {
markbbhead[fi.jmpout_op1] = 1;
}
if (fi.jmpout_op2 != XC_OPNUM_INVALID) {
markbbhead[fi.jmpout_op2] = 1;
}
if (fi.jmpout_ext != XC_OPNUM_INVALID) {
markbbhead[fi.jmpout_ext] = 1;
}
if (i + 1 < count) {
markbbhead[i + 1] = 1;
}
}
}
#ifdef ZEND_ENGINE_2
/* mark try start */
for (i = 0; i < op_array->last_try_catch; i ++) {
markbbhead[op_array->try_catch_array[i].try_op] = 1;
}
#endif
/* }}} */
/* {{{ fill op lines with newly allocated id */
for (i = 0; i < count; i ++) {
bbids[i] = BBID_INVALID;
}
id = -1;
for (i = 0; i < count; i ++) {
if (markbbhead[i]) {
id ++;
}
bbids[i] = id;
TRACE("bbids[%d] = %d", i, id);
}
/* }}} */
#ifdef ZEND_ENGINE_2
/* {{{ fill op lines with catch id */
for (i = 0; i < count; i ++) {
catchbbids[i] = BBID_INVALID;
}
for (i = 0; i < op_array->last_try_catch; i ++) {
zend_uint j;
zend_try_catch_element *e = &op_array->try_catch_array[i];
for (j = e->try_op; j < e->catch_op; j ++) {
catchbbids[j] = bbids[e->catch_op];
}
}
#ifdef XCACHE_DEBUG
for (i = 0; i < count; i ++) {
TRACE("catchbbids[%d] = %d", i, catchbbids[i]);
}
#endif
/* }}} */
#endif
/* {{{ create basic blocks */
start = 0;
id = 0;
/* loop over to deal with the last block */
for (i = 1; i <= count; i ++) {
if (i < count && id == bbids[i]) {
continue;
}
opline = op_array->opcodes + start;
pbb = bbs_new_bb_ex(bbs, opline, i - start);
#ifdef ZEND_ENGINE_2
pbb->catch = catchbbids[start];
#endif
/* last */
opline = pbb->opcodes + pbb->count - 1;
if (op_get_flowinfo(&fi, opline) == SUCCESS) {
if (fi.jmpout_op1 != XC_OPNUM_INVALID) {
Z_OP(opline->op1).opline_num = bbids[fi.jmpout_op1];
assert(Z_OP(opline->op1).opline_num != BBID_INVALID);
}
if (fi.jmpout_op2 != XC_OPNUM_INVALID) {
Z_OP(opline->op2).opline_num = bbids[fi.jmpout_op2];
assert(Z_OP(opline->op2).opline_num != BBID_INVALID);
}
if (fi.jmpout_ext != XC_OPNUM_INVALID) {
opline->extended_value = bbids[fi.jmpout_ext];
assert(opline->extended_value != BBID_INVALID);
}
if (fi.fall && i + 1 < count) {
pbb->fall = bbids[i + 1];
TRACE("fall %d", pbb->fall);
assert(pbb->fall != BBID_INVALID);
}
}
if (i >= count) {
break;
}
start = i;
id = bbids[i];
}
/* }}} */
my_free_alloca(markbbhead, use_heap_markbbhead);
#ifdef ZEND_ENGINE_2
my_free_alloca(catchbbids, use_heap_catchbbids);
#endif
my_free_alloca(bbids, use_heap_bbids);
return SUCCESS;
}
/* }}} */
static void bbs_restore_opnum(bbs_t *bbs, zend_op_array *op_array) /* {{{ */
{
int i;
#ifdef ZEND_ENGINE_2
bbid_t lasttrybbid;
bbid_t lastcatchbbid;
#endif
for (i = 0; i < bbs_count(bbs); i ++) {
op_flowinfo_t fi;
bb_t *bb = bbs_get(bbs, i);
zend_op *last = bb->opcodes + bb->count - 1;
if (op_get_flowinfo(&fi, last) == SUCCESS) {
if (fi.jmpout_op1 != XC_OPNUM_INVALID) {
Z_OP(last->op1).opline_num = bbs_get(bbs, fi.jmpout_op1)->opnum;
assert(Z_OP(last->op1).opline_num != BBID_INVALID);
}
if (fi.jmpout_op2 != XC_OPNUM_INVALID) {
Z_OP(last->op2).opline_num = bbs_get(bbs, fi.jmpout_op2)->opnum;
assert(Z_OP(last->op2).opline_num != BBID_INVALID);
}
if (fi.jmpout_ext != XC_OPNUM_INVALID) {
last->extended_value = bbs_get(bbs, fi.jmpout_ext)->opnum;
assert(last->extended_value != BBID_INVALID);
}
}
}
#ifdef ZEND_ENGINE_2
lasttrybbid = BBID_INVALID;
lastcatchbbid = BBID_INVALID;
op_array->last_try_catch = 0;
for (i = 0; i < bbs_count(bbs); i ++) {
bb_t *bb = bbs_get(bbs, i);
if (lastcatchbbid != bb->catch) {
if (lasttrybbid != BBID_INVALID && lastcatchbbid != BBID_INVALID) {
int try_catch_offset = op_array->last_try_catch ++;
op_array->try_catch_array = erealloc(op_array->try_catch_array, sizeof(zend_try_catch_element) * op_array->last_try_catch);
op_array->try_catch_array[try_catch_offset].try_op = bbs_get(bbs, lasttrybbid)->opnum;
op_array->try_catch_array[try_catch_offset].catch_op = bbs_get(bbs, lastcatchbbid)->opnum;
}
lasttrybbid = i;
lastcatchbbid = bb->catch;
}
}
/* it is impossible to have last bb catched */
#endif
}
/* }}} */
/*
* optimize
*/
static int xc_optimize_op_array(zend_op_array *op_array TSRMLS_DC) /* {{{ */
{
bbs_t bbs;
if (op_array->type != ZEND_USER_FUNCTION) {
return 0;
}
#ifdef XCACHE_DEBUG
# if 0
TRACE("optimize file: %s", op_array->filename);
xc_dprint_zend_op_array(op_array, 0 TSRMLS_CC);
# endif
op_print(0, op_array->opcodes, op_array->opcodes + op_array->last);
#endif
if (op_array_convert_switch(op_array) == SUCCESS) {
bbs_init(&bbs);
if (bbs_build_from(&bbs, op_array, op_array->last) == SUCCESS) {
int i;
#ifdef XCACHE_DEBUG
bbs_print(&bbs, op_array->opcodes);
#endif
/* TODO: calc opnum after basic block move */
for (i = 0; i < bbs_count(&bbs); i ++) {
bb_t *bb = bbs_get(&bbs, i);
bb->opnum = bb->opcodes - op_array->opcodes;
}
bbs_restore_opnum(&bbs, op_array);
}
bbs_destroy(&bbs);
}
#ifdef XCACHE_DEBUG
# if 0
TRACE("%s", "after compiles");
xc_dprint_zend_op_array(op_array, 0 TSRMLS_CC);
# endif
op_print(0, op_array->opcodes, op_array->opcodes + op_array->last);
#endif
return 0;
}
/* }}} */
static void xc_optimizer_op_array_handler(zend_op_array *op_array) /* {{{ */
{
TSRMLS_FETCH();
if (XG(optimizer)) {
xc_optimize_op_array(op_array TSRMLS_CC);
}
}
/* }}} */
static int xc_coverager_zend_startup(zend_extension *extension) /* {{{ */
{
return SUCCESS;
}
/* }}} */
static void xc_coverager_zend_shutdown(zend_extension *extension) /* {{{ */
{
}
/* }}} */
/* {{{ zend extension definition structure */
static zend_extension xc_optimizer_zend_extension_entry = {
XCACHE_NAME " Optimizer",
XCACHE_VERSION,
XCACHE_AUTHOR,
XCACHE_URL,
XCACHE_COPYRIGHT,
xc_coverager_zend_startup,
xc_coverager_zend_shutdown,
NULL, /* activate_func_t */
NULL, /* deactivate_func_t */
NULL, /* message_handler_func_t */
xc_optimizer_op_array_handler,
NULL, /* statement_handler_func_t */
NULL, /* fcall_begin_handler_func_t */
NULL, /* fcall_end_handler_func_t */
NULL, /* op_array_ctor_func_t */
NULL, /* op_array_dtor_func_t */
STANDARD_ZEND_EXTENSION_PROPERTIES
};
/* }}} */
/* {{{ ini */
PHP_INI_BEGIN()
STD_PHP_INI_BOOLEAN("xcache.optimizer", "0", PHP_INI_ALL, OnUpdateBool, optimizer, zend_xcache_globals, xcache_globals)
PHP_INI_END()
/* }}} */
static PHP_MINFO_FUNCTION(xcache_optimizer) /* {{{ */
{
php_info_print_table_start();
php_info_print_table_row(2, "XCache Optimizer Module", "enabled");
php_info_print_table_end();
DISPLAY_INI_ENTRIES();
}
/* }}} */
static PHP_MINIT_FUNCTION(xcache_optimizer) /* {{{ */
{
REGISTER_INI_ENTRIES();
return xcache_zend_extension_register(&xc_optimizer_zend_extension_entry, 0);
}
/* }}} */
static PHP_MSHUTDOWN_FUNCTION(xcache_optimizer) /* {{{ */
{
UNREGISTER_INI_ENTRIES();
return xcache_zend_extension_unregister(&xc_optimizer_zend_extension_entry);
}
/* }}} */
static zend_module_entry xcache_optimizer_module_entry = { /* {{{ */
STANDARD_MODULE_HEADER,
XCACHE_NAME " Optimizer",
NULL,
PHP_MINIT(xcache_optimizer),
PHP_MSHUTDOWN(xcache_optimizer),
NULL,
NULL,
PHP_MINFO(xcache_optimizer),
XCACHE_VERSION,
#ifdef PHP_GINIT
NO_MODULE_GLOBALS,
#endif
#ifdef ZEND_ENGINE_2
NULL,
#else
NULL,
NULL,
#endif
STANDARD_MODULE_PROPERTIES_EX
};
/* }}} */
int xc_optimizer_startup_module() /* {{{ */
{
return zend_startup_module(&xcache_optimizer_module_entry);
}
/* }}} */