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 "xcache.h"
#include "utils.h"
#ifdef ZEND_ENGINE_2_1
#include "zend_vm.h"
#endif
#include "opcode_spec.h"
#undef NDEBUG
#include "assert.h"
#ifndef max
#define max(a, b) ((a) < (b) ? (b) : (a))
#endif
#ifndef ZEND_VM_SET_OPCODE_HANDLER
# define ZEND_VM_SET_OPCODE_HANDLER(opline) do { } while (0)
#endif
#define OP_ZVAL_DTOR(op) do { \
(op).u.constant.is_ref = 0; \
zval_dtor(&(op).u.constant); \
} while(0)
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, (void *) applyer TSRMLS_CC);
zend_hash_apply_with_argument(cr->class_table, (apply_func_arg_t) xc_apply_cest, (void *) 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
int xc_foreach_early_binding_class(zend_op_array *op_array, void (*callback)(zend_op *opline, int oplineno, void *data TSRMLS_DC), void *data TSRMLS_DC) /* {{{ */
{
zend_op *opline, *begin, *end, *next = NULL;
opline = begin = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
switch (opline->opcode) {
case ZEND_JMP:
next = begin + opline->op1.u.opline_num;
break;
case ZEND_JMPZNZ:
next = begin + max(opline->op2.u.opline_num, opline->extended_value);
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
next = begin + opline->op2.u.opline_num;
break;
case ZEND_RETURN:
opline = end;
break;
#ifdef ZEND_ENGINE_2
case ZEND_DECLARE_INHERITED_CLASS:
callback(opline, opline - begin, data TSRMLS_CC);
break;
#else
case ZEND_DECLARE_FUNCTION_OR_CLASS:
if (opline->extended_value == ZEND_DECLARE_INHERITED_CLASS) {
callback(opline, opline - begin, data TSRMLS_CC);
}
break;
#endif
}
if (opline < next) {
opline = next;
}
else {
opline ++;
}
}
return SUCCESS;
}
/* }}} */
static int xc_do_early_binding(zend_op_array *op_array, HashTable *class_table, int oplineno TSRMLS_DC) /* {{{ */
{
zend_op *opline;
TRACE("binding %d", oplineno);
assert(oplineno >= 0);
/* do early binding */
opline = &(op_array->opcodes[oplineno]);
switch (opline->opcode) {
#ifdef ZEND_ENGINE_2
case ZEND_DECLARE_INHERITED_CLASS:
{
zval *parent_name;
zend_class_entry **pce;
/* don't early-bind classes that implement interfaces */
if ((opline + 1)->opcode == ZEND_FETCH_CLASS && (opline + 2)->opcode == ZEND_ADD_INTERFACE) {
return FAILURE;
}
parent_name = &(opline - 1)->op2.u.constant;
TRACE("binding with parent %s", Z_STRVAL_P(parent_name));
if (zend_lookup_class(Z_STRVAL_P(parent_name), Z_STRLEN_P(parent_name), &pce TSRMLS_CC) == FAILURE) {
return FAILURE;
}
if (do_bind_inherited_class(opline, class_table, *pce, 1 TSRMLS_CC) == NULL) {
return FAILURE;
}
}
/* clear unnecessary ZEND_FETCH_CLASS opcode */
if (opline > op_array->opcodes
&& (opline - 1)->opcode == ZEND_FETCH_CLASS) {
zend_op *fetch_class_opline = opline - 1;
TRACE("%s %p", Z_STRVAL(fetch_class_opline->op2.u.constant), Z_STRVAL(fetch_class_opline->op2.u.constant));
OP_ZVAL_DTOR(fetch_class_opline->op2);
fetch_class_opline->opcode = ZEND_NOP;
ZEND_VM_SET_OPCODE_HANDLER(fetch_class_opline);
memset(&fetch_class_opline->op1, 0, sizeof(znode));
memset(&fetch_class_opline->op2, 0, sizeof(znode));
SET_UNUSED(fetch_class_opline->op1);
SET_UNUSED(fetch_class_opline->op2);
SET_UNUSED(fetch_class_opline->result);
}
/* clear unnecessary ZEND_VERIFY_ABSTRACT_CLASS opcode */
if ((opline + 1)->opcode == ZEND_VERIFY_ABSTRACT_CLASS) {
zend_op *abstract_op = opline + 1;
memset(abstract_op, 0, sizeof(abstract_op[0]));
abstract_op->lineno = 0;
SET_UNUSED(abstract_op->op1);
SET_UNUSED(abstract_op->op2);
SET_UNUSED(abstract_op->result);
abstract_op->opcode = ZEND_NOP;
ZEND_VM_SET_OPCODE_HANDLER(abstract_op);
}
#else
case ZEND_DECLARE_FUNCTION_OR_CLASS:
if (do_bind_function_or_class(opline, NULL, class_table, 1) == FAILURE) {
return FAILURE;
}
#endif
break;
default:
return FAILURE;
}
zend_hash_del(class_table, opline->op1.u.constant.value.str.val, opline->op1.u.constant.value.str.len);
OP_ZVAL_DTOR(opline->op1);
OP_ZVAL_DTOR(opline->op2);
opline->opcode = ZEND_NOP;
ZEND_VM_SET_OPCODE_HANDLER(opline);
memset(&opline->op1, 0, sizeof(znode));
memset(&opline->op2, 0, sizeof(znode));
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
return SUCCESS;
}
/* }}} */
#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(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(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, int oplineno, 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)
);
if (oplineno != -1) {
xc_do_early_binding(CG(active_op_array), CG(class_table), oplineno TSRMLS_CC);
}
}
else if (zend_u_hash_add(CG(class_table), type, key, len,
cest, sizeof(xc_cest_t),
ZESW(&stored_ce_ptr, NULL)
) == FAILURE) {
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
assert(oplineno == -1);
}
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)
/* }}} */
#ifdef ZEND_ENGINE_2_1
static zend_bool xc_auto_global_callback(char *name, uint name_len TSRMLS_DC) /* {{{ */
{
zend_auto_global *auto_global;
if (zend_u_hash_find(CG(auto_globals), UG(unicode) ? IS_UNICODE : IS_STRING, ZSTR(name), name_len + 1, (void **) &auto_global) == FAILURE) {
return 1;
}
return 0;
}
/* }}} */
static int xc_auto_global_arm(zend_auto_global *auto_global TSRMLS_DC) /* {{{ */
{
if (auto_global->auto_global_callback) {
auto_global->armed = 1;
auto_global->auto_global_callback = xc_auto_global_callback;
}
else {
auto_global->armed = 0;
}
return ZEND_HASH_APPLY_KEEP;
}
/* }}} */
#endif
xc_sandbox_t *xc_sandbox_init(xc_sandbox_t *sandbox, char *filename TSRMLS_DC) /* {{{ */
{
HashTable *h;
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);
OG(class_table) = CG(class_table);
CG(class_table) = &TG(class_table);
EG(class_table) = CG(class_table);
#ifdef ZEND_ENGINE_2_1
OG(auto_globals) = CG(auto_globals);
CG(auto_globals) = &TG(auto_globals);
#endif
TG(included_files) = &EG(included_files);
zend_hash_init_ex(TG(included_files), 5, NULL, NULL, 0, 1);
#ifdef HAVE_XCACHE_CONSTANT
h = OG(zend_constants);
zend_hash_init_ex(&TG(zend_constants), 20, NULL, h->pDestructor, h->persistent, h->bApplyProtection);
#endif
h = OG(function_table);
zend_hash_init_ex(&TG(function_table), 128, NULL, h->pDestructor, h->persistent, h->bApplyProtection);
h = OG(class_table);
zend_hash_init_ex(&TG(class_table), 16, NULL, h->pDestructor, h->persistent, h->bApplyProtection);
#ifdef ZEND_ENGINE_2_1
/* shallow copy, don't destruct */
h = OG(auto_globals);
zend_hash_init_ex(&TG(auto_globals), 8, NULL, NULL, h->persistent, h->bApplyProtection);
{
zend_auto_global tmp_autoglobal;
zend_hash_copy(&TG(auto_globals), OG(auto_globals), NULL, (void *) &tmp_autoglobal, sizeof(tmp_autoglobal));
zend_hash_apply(&TG(auto_globals), (apply_func_t) xc_auto_global_arm TSRMLS_CC);
}
#endif
sandbox->filename = filename;
#ifdef E_STRICT
sandbox->orig_user_error_handler_error_reporting = EG(user_error_handler_error_reporting);
EG(user_error_handler_error_reporting) &= ~E_STRICT;
#endif
return sandbox;
}
/* }}} */
static void xc_early_binding_cb(zend_op *opline, int oplineno, void *data TSRMLS_DC) /* {{{ */
{
xc_sandbox_t *sandbox = (xc_sandbox_t *) data;
xc_do_early_binding(CG(active_op_array), OG(class_table), oplineno TSRMLS_CC);
}
/* }}} */
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_S(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_S(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, -1,
BUCKET_KEY_TYPE(b), ZSTR(BUCKET_KEY_S(b)), b->nKeyLength TSRMLS_CC);
b = b->pListNext;
}
#ifdef ZEND_ENGINE_2_1
/* trigger auto_globals jit */
for (b = TG(auto_globals).pListHead; b != NULL; b = b->pListNext) {
zend_auto_global *auto_global = (zend_auto_global *) b->pData;
/* check if actived */
if (auto_global->auto_global_callback && !auto_global->armed) {
zend_u_is_auto_global(BUCKET_KEY_TYPE(b), ZSTR(BUCKET_KEY_S(b)), auto_global->name_len TSRMLS_CC);
}
}
#endif
xc_undo_pass_two(CG(active_op_array) TSRMLS_CC);
xc_foreach_early_binding_class(CG(active_op_array), xc_early_binding_cb, (void *) sandbox TSRMLS_CC);
xc_redo_pass_two(CG(active_op_array) TSRMLS_CC);
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);
#ifdef ZEND_ENGINE_2_1
CG(auto_globals) = OG(auto_globals);
#endif
if (install) {
CG(in_compilation) = 1;
CG(compiled_filename) = sandbox->filename;
CG(zend_lineno) = 0;
xc_sandbox_install(sandbox TSRMLS_CC);
CG(in_compilation) = 0;
CG(compiled_filename) = NULL;
/* 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));
#ifdef ZEND_ENGINE_2_1
zend_hash_destroy(&TG(auto_globals));
#endif
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)));
#ifdef E_STRICT
EG(user_error_handler_error_reporting) = sandbox->orig_user_error_handler_error_reporting;
#endif
if (sandbox->alloc) {
efree(sandbox);
}
}
/* }}} */
int xc_vtrace(const char *fmt, va_list args) /* {{{ */
{
vfprintf(stderr, fmt, args);
return 0;
}
/* }}} */
int xc_trace(const char *fmt, ...) /* {{{ */
{
va_list args;
va_start(args, fmt);
xc_vtrace(fmt, args);
va_end(args);
return 0;
}
/* }}} */