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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#include "php.h"
#include "xcache.h"
#include "utils.h"
#ifdef ZEND_ENGINE_2_1
#include "zend_vm.h"
#endif
#include "opcode_spec.h"
#undef NDEBUG
#include "assert.h"
xc_compile_result_t *xc_compile_result_init(xc_compile_result_t *cr, /* {{{ */
zend_op_array *op_array,
HashTable *function_table,
HashTable *class_table)
{
if (cr) {
cr->alloc = 0;
}
else {
cr = emalloc(sizeof(xc_compile_result_t));
cr->alloc = 1;
}
cr->op_array = op_array;
cr->function_table = function_table;
cr->class_table = class_table;
return cr;
}
/* }}} */
xc_compile_result_t *xc_compile_result_init_cur(xc_compile_result_t *cr, zend_op_array *op_array TSRMLS_DC) /* {{{ */
{
return xc_compile_result_init(cr, op_array, CG(function_table), CG(class_table));
}
/* }}} */
void xc_compile_result_free(xc_compile_result_t *cr) /* {{{ */
{
if (cr->alloc) {
efree(cr);
}
}
/* }}} */
int xc_apply_function(zend_function *zf, apply_func_t applyer TSRMLS_DC) /* {{{ */
{
switch (zf->type) {
case ZEND_USER_FUNCTION:
case ZEND_EVAL_CODE:
return applyer(&zf->op_array TSRMLS_CC);
break;
case ZEND_INTERNAL_FUNCTION:
case ZEND_OVERLOADED_FUNCTION:
break;
EMPTY_SWITCH_DEFAULT_CASE();
}
return 0;
}
/* }}} */
typedef struct {
apply_func_t applyer;
zend_class_entry *ce;
} xc_apply_method_info;
int xc_apply_method(zend_function *zf, xc_apply_method_info *mi TSRMLS_DC) /* {{{ */
{
/* avoid duplicate apply for shadowed method */
#ifdef ZEND_ENGINE_2
if (mi->ce != zf->common.scope) {
/* fprintf(stderr, "avoided duplicate %s\n", zf->common.function_name); */
return 0;
}
#else
char *name = zf->common.function_name;
int name_s = strlen(name) + 1;
zend_class_entry *ce;
zend_function *ptr;
for (ce = mi->ce->parent; ce; ce = ce->parent) {
if (zend_hash_find(&ce->function_table, name, name_s, (void **) &ptr) == SUCCESS) {
if (ptr->op_array.refcount == zf->op_array.refcount) {
return 0;
}
}
}
#endif
return xc_apply_function(zf, mi->applyer TSRMLS_CC);
}
/* }}} */
#if 0
int xc_apply_class(zend_class_entry *ce, apply_func_t applyer TSRMLS_DC) /* {{{ */
{
xc_apply_method_info mi;
mi.applyer = applyer;
mi.ce = ce;
zend_hash_apply_with_argument(&(ce->function_table), (apply_func_arg_t) xc_apply_method, &mi TSRMLS_CC);
return 0;
}
/* }}} */
#endif
static int xc_apply_cest(xc_cest_t *cest, apply_func_t applyer TSRMLS_DC) /* {{{ */
{
xc_apply_method_info mi;
mi.applyer = applyer;
mi.ce = CestToCePtr(*cest);
zend_hash_apply_with_argument(&(CestToCePtr(*cest)->function_table), (apply_func_arg_t) xc_apply_method, &mi TSRMLS_CC);
return 0;
}
/* }}} */
int xc_apply_op_array(xc_compile_result_t *cr, apply_func_t applyer TSRMLS_DC) /* {{{ */
{
zend_hash_apply_with_argument(cr->function_table, (apply_func_arg_t) xc_apply_function, applyer TSRMLS_CC);
zend_hash_apply_with_argument(cr->class_table, (apply_func_arg_t) xc_apply_cest, applyer TSRMLS_CC);
return applyer(cr->op_array TSRMLS_CC);
}
/* }}} */
int xc_undo_pass_two(zend_op_array *op_array TSRMLS_DC) /* {{{ */
{
zend_op *opline, *end;
if (!op_array->done_pass_two) {
return 0;
}
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
#ifdef ZEND_ENGINE_2_1
switch (opline->opcode) {
case ZEND_JMP:
opline->op1.u.opline_num = opline->op1.u.jmp_addr - op_array->opcodes;
assert(opline->op1.u.opline_num < op_array->last);
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
opline->op2.u.opline_num = opline->op2.u.jmp_addr - op_array->opcodes;
assert(opline->op2.u.opline_num < op_array->last);
break;
}
#endif
opline++;
}
op_array->done_pass_two = 0;
return 0;
}
/* }}} */
int xc_redo_pass_two(zend_op_array *op_array TSRMLS_DC) /* {{{ */
{
zend_op *opline, *end;
if (op_array->done_pass_two) {
return 0;
}
/*
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes, sizeof(zend_op)*op_array->last);
op_array->size = op_array->last;
*/
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->op1.op_type == IS_CONST) {
opline->op1.u.constant.is_ref = 1;
opline->op1.u.constant.refcount = 2; /* Make sure is_ref won't be reset */
}
if (opline->op2.op_type == IS_CONST) {
opline->op2.u.constant.is_ref = 1;
opline->op2.u.constant.refcount = 2;
}
#ifdef ZEND_ENGINE_2_1
switch (opline->opcode) {
case ZEND_JMP:
assert(opline->op1.u.opline_num < op_array->last);
opline->op1.u.jmp_addr = op_array->opcodes + opline->op1.u.opline_num;
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
assert(opline->op2.u.opline_num < op_array->last);
opline->op2.u.jmp_addr = op_array->opcodes + opline->op2.u.opline_num;
break;
}
ZEND_VM_SET_OPCODE_HANDLER(opline);
#endif
opline++;
}
op_array->done_pass_two = 1;
return 0;
}
/* }}} */
#ifdef HAVE_XCACHE_OPCODE_SPEC_DEF
static void xc_fix_opcode_ex_znode(int tofix, xc_op_spec_t spec, znode *znode, int type TSRMLS_DC) /* {{{ */
{
#ifdef ZEND_ENGINE_2
if ((znode->op_type != IS_UNUSED && (spec == OPSPEC_UCLASS || spec == OPSPEC_CLASS)) ||
spec == OPSPEC_FETCH) {
if (tofix) {
switch (znode->op_type) {
case IS_VAR:
case IS_TMP_VAR:
break;
default:
/* TODO: data lost, find a way to keep it */
/* assert(znode->op_type == IS_CONST); */
znode->op_type = IS_TMP_VAR;
}
}
}
switch (znode->op_type) {
case IS_TMP_VAR:
case IS_VAR:
if (tofix) {
znode->u.var /= sizeof(temp_variable);
}
else {
znode->u.var *= sizeof(temp_variable);
}
}
#endif
}
/* }}} */
static void xc_fix_opcode_ex(zend_op_array *op_array, int tofix TSRMLS_DC) /* {{{ */
{
zend_op *opline;
zend_uint i;
opline = op_array->opcodes;
for (i = 0; i < op_array->last; i ++, opline ++) {
/* 3rd optimizer may have ... */
if (opline->opcode < xc_get_opcode_spec_count()) {
const xc_opcode_spec_t *spec;
spec = xc_get_opcode_spec(opline->opcode);
xc_fix_opcode_ex_znode(tofix, spec->op1, &opline->op1, 0 TSRMLS_CC);
xc_fix_opcode_ex_znode(tofix, spec->op2, &opline->op2, 1 TSRMLS_CC);
xc_fix_opcode_ex_znode(tofix, spec->res, &opline->result, 2 TSRMLS_CC);
}
}
}
/* }}} */
int xc_fix_opcode(zend_op_array *op_array TSRMLS_DC) /* {{{ */
{
xc_fix_opcode_ex(op_array, 1 TSRMLS_CC);
return 0;
}
/* }}} */
int xc_undo_fix_opcode(zend_op_array *op_array TSRMLS_DC) /* {{{ */
{
xc_fix_opcode_ex(op_array, 0 TSRMLS_CC);
return 0;
}
/* }}} */
#endif
#ifdef HAVE_XCACHE_CONSTANT
void xc_install_constant(char *filename, zend_constant *constant, zend_uchar type, zstr key, uint len TSRMLS_DC) /* {{{ */
{
if (zend_u_hash_add(EG(zend_constants), type, key, len,
constant, sizeof(zend_constant),
NULL
) == FAILURE) {
CG(in_compilation) = 1;
CG(compiled_filename) = filename;
CG(zend_lineno) = 0;
#ifdef IS_UNICODE
zend_error(E_NOTICE, "Constant %R already defined", type, key);
#else
zend_error(E_NOTICE, "Constant %s already defined", key);
#endif
free(ZSTR_V(constant->name));
if (!(constant->flags & CONST_PERSISTENT)) {
zval_dtor(&constant->value);
}
}
}
/* }}} */
#endif
void xc_install_function(char *filename, zend_function *func, zend_uchar type, zstr key, uint len TSRMLS_DC) /* {{{ */
{
zend_bool istmpkey;
if (func->type == ZEND_USER_FUNCTION) {
#ifdef IS_UNICODE
istmpkey = (type == IS_STRING && ZSTR_S(key)[0] == 0) || ZSTR_U(key)[0] == 0;
#else
istmpkey = ZSTR_S(key)[0] == 0;
#endif
if (istmpkey) {
zend_u_hash_update(CG(function_table), type, key, len,
func, sizeof(zend_op_array),
NULL
);
}
else if (zend_u_hash_add(CG(function_table), type, key, len,
func, sizeof(zend_op_array),
NULL
) == FAILURE) {
CG(in_compilation) = 1;
CG(compiled_filename) = filename;
CG(zend_lineno) = ZESW(func->op_array.opcodes[0].lineno, func->op_array.line_start);
#ifdef IS_UNICODE
zend_error(E_ERROR, "Cannot redeclare %R()", type, key);
#else
zend_error(E_ERROR, "Cannot redeclare %s()", key);
#endif
}
}
}
/* }}} */
ZESW(xc_cest_t *, void) xc_install_class(char *filename, xc_cest_t *cest, zend_uchar type, zstr key, uint len TSRMLS_DC) /* {{{ */
{
zend_bool istmpkey;
zend_class_entry *cep = CestToCePtr(*cest);
ZESW(void *stored_ce_ptr, NOTHING);
#ifdef IS_UNICODE
istmpkey = (type == IS_STRING && ZSTR_S(key)[0] == 0) || ZSTR_U(key)[0] == 0;
#else
istmpkey = ZSTR_S(key)[0] == 0;
#endif
if (istmpkey) {
zend_u_hash_update(CG(class_table), type, key, len,
cest, sizeof(xc_cest_t),
ZESW(&stored_ce_ptr, NULL)
);
}
else if (zend_u_hash_add(CG(class_table), type, key, len,
cest, sizeof(xc_cest_t),
ZESW(&stored_ce_ptr, NULL)
) == FAILURE) {
CG(in_compilation) = 1;
CG(compiled_filename) = filename;
CG(zend_lineno) = ZESW(0, cep->line_start);
#ifdef IS_UNICODE
zend_error(E_ERROR, "Cannot redeclare class %R", type, cep->name);
#else
zend_error(E_ERROR, "Cannot redeclare class %s", cep->name);
#endif
}
ZESW(return (xc_cest_t *) stored_ce_ptr, NOTHING);
}
/* }}} */
/* sandbox {{{ */
#undef TG
#undef OG
#define TG(x) (sandbox->tmp_##x)
#define OG(x) (sandbox->orig_##x)
/* }}} */
xc_sandbox_t *xc_sandbox_init(xc_sandbox_t *sandbox, char *filename TSRMLS_DC) /* {{{ */
{
if (sandbox) {
memset(sandbox, 0, sizeof(sandbox[0]));
}
else {
ECALLOC_ONE(sandbox);
sandbox->alloc = 1;
}
memcpy(&OG(included_files), &EG(included_files), sizeof(EG(included_files)));
#ifdef HAVE_XCACHE_CONSTANT
OG(zend_constants) = EG(zend_constants);
EG(zend_constants) = &TG(zend_constants);
#endif
OG(function_table) = CG(function_table);
CG(function_table) = &TG(function_table);
assert(EG(class_table) == CG(class_table));
OG(class_table) = CG(class_table);
CG(class_table) = &TG(class_table);
EG(class_table) = CG(class_table);
TG(included_files) = &EG(included_files);
zend_hash_init_ex(TG(included_files), 5, NULL, NULL, 0, 1);
#ifdef HAVE_XCACHE_CONSTANT
zend_hash_init_ex(&TG(zend_constants), 20, NULL, EG(zend_constants)->pDestructor, 1, 0);
#endif
zend_hash_init_ex(&TG(function_table), 128, NULL, CG(function_table)->pDestructor, 0, 0);
zend_hash_init_ex(&TG(class_table), 16, NULL, CG(class_table)->pDestructor, 0, 0);
sandbox->filename = filename;
return sandbox;
}
/* }}} */
static void xc_sandbox_install(xc_sandbox_t *sandbox TSRMLS_DC) /* {{{ */
{
int i;
Bucket *b;
#ifdef HAVE_XCACHE_CONSTANT
b = TG(zend_constants).pListHead;
/* install constants */
while (b != NULL) {
zend_constant *c = (zend_constant*) b->pData;
xc_install_constant(sandbox->filename, c,
BUCKET_KEY_TYPE(b), ZSTR(BUCKET_KEY(b)), b->nKeyLength TSRMLS_CC);
b = b->pListNext;
}
#endif
b = TG(function_table).pListHead;
/* install function */
while (b != NULL) {
zend_function *func = (zend_function*) b->pData;
xc_install_function(sandbox->filename, func,
BUCKET_KEY_TYPE(b), ZSTR(BUCKET_KEY(b)), b->nKeyLength TSRMLS_CC);
b = b->pListNext;
}
b = TG(class_table).pListHead;
/* install class */
while (b != NULL) {
xc_install_class(sandbox->filename, (xc_cest_t*)b->pData,
BUCKET_KEY_TYPE(b), ZSTR(BUCKET_KEY(b)), b->nKeyLength TSRMLS_CC);
b = b->pListNext;
}
i = 1;
zend_hash_add(&OG(included_files), sandbox->filename, strlen(sandbox->filename) + 1, (void *)&i, sizeof(int), NULL);
}
/* }}} */
void xc_sandbox_free(xc_sandbox_t *sandbox, int install TSRMLS_DC) /* {{{ */
{
/* restore first first install function/class */
#ifdef HAVE_XCACHE_CONSTANT
EG(zend_constants) = OG(zend_constants);
#endif
CG(function_table) = OG(function_table);
CG(class_table) = OG(class_table);
EG(class_table) = CG(class_table);
if (install) {
xc_sandbox_install(sandbox TSRMLS_CC);
/* no free as it's installed */
#ifdef HAVE_XCACHE_CONSTANT
TG(zend_constants).pDestructor = NULL;
#endif
TG(function_table).pDestructor = NULL;
TG(class_table).pDestructor = NULL;
}
/* destroy all the tmp */
#ifdef HAVE_XCACHE_CONSTANT
zend_hash_destroy(&TG(zend_constants));
#endif
zend_hash_destroy(&TG(function_table));
zend_hash_destroy(&TG(class_table));
zend_hash_destroy(TG(included_files));
/* restore orig here, as EG/CG holded tmp before */
memcpy(&EG(included_files), &OG(included_files), sizeof(EG(included_files)));
if (sandbox->alloc) {
efree(sandbox);
}
}
/* }}} */