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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#include "zend.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_variables.h"
#include "zend_operators.h"
#include "zend_globals.h"


void free_zend_constant(zend_constant *c)
{
if (!(c->flags & CONST_PERSISTENT)) {
zval_dtor(&c->value);
}
str_free(c->name);
}


void copy_zend_constant(zend_constant *c)
{
if (!IS_INTERNED(c->name)) {
c->name = zend_strndup(c->name, c->name_len - 1);
}
if (!(c->flags & CONST_PERSISTENT)) {
zval_copy_ctor(&c->value);
}
}


void zend_copy_constants(HashTable *target, HashTable *source)
{
zend_constant tmp_constant;

zend_hash_copy(target, source, (copy_ctor_func_t) copy_zend_constant, &tmp_constant, sizeof(zend_constant));
}


static int clean_non_persistent_constant(const zend_constant *c TSRMLS_DC)
{
return (c->flags & CONST_PERSISTENT) ? ZEND_HASH_APPLY_STOP : ZEND_HASH_APPLY_REMOVE;
}


static int clean_non_persistent_constant_full(const zend_constant *c TSRMLS_DC)
{
return (c->flags & CONST_PERSISTENT) ? 0 : 1;
}


static int clean_module_constant(const zend_constant *c, int *module_number TSRMLS_DC)
{
if (c->module_number == *module_number) {
return 1;
} else {
return 0;
}
}


void clean_module_constants(int module_number TSRMLS_DC)
{
zend_hash_apply_with_argument(EG(zend_constants), (apply_func_arg_t) clean_module_constant, (void *) &module_number TSRMLS_CC);
}


int zend_startup_constants(TSRMLS_D)
{
EG(zend_constants) = (HashTable *) malloc(sizeof(HashTable));

if (zend_hash_init(EG(zend_constants), 20, NULL, ZEND_CONSTANT_DTOR, 1)==FAILURE) {
return FAILURE;
}
return SUCCESS;
}



void zend_register_standard_constants(TSRMLS_D)
{
REGISTER_MAIN_LONG_CONSTANT("E_ERROR", E_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_RECOVERABLE_ERROR", E_RECOVERABLE_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_WARNING", E_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_PARSE", E_PARSE, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_NOTICE", E_NOTICE, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_STRICT", E_STRICT, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_DEPRECATED", E_DEPRECATED, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_CORE_ERROR", E_CORE_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_CORE_WARNING", E_CORE_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_ERROR", E_COMPILE_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_WARNING", E_COMPILE_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_ERROR", E_USER_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_WARNING", E_USER_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_NOTICE", E_USER_NOTICE, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_DEPRECATED", E_USER_DEPRECATED, CONST_PERSISTENT | CONST_CS);

REGISTER_MAIN_LONG_CONSTANT("E_ALL", E_ALL, CONST_PERSISTENT | CONST_CS);

REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_PROVIDE_OBJECT", DEBUG_BACKTRACE_PROVIDE_OBJECT, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_IGNORE_ARGS", DEBUG_BACKTRACE_IGNORE_ARGS, CONST_PERSISTENT | CONST_CS);
/* true/false constants */
{
zend_constant c;

c.flags = CONST_PERSISTENT | CONST_CT_SUBST;
c.module_number = 0;

c.name = zend_strndup(ZEND_STRL("TRUE"));
c.name_len = sizeof("TRUE");
c.value.value.lval = 1;
c.value.type = IS_BOOL;
zend_register_constant(&c TSRMLS_CC);

c.name = zend_strndup(ZEND_STRL("FALSE"));
c.name_len = sizeof("FALSE");
c.value.value.lval = 0;
c.value.type = IS_BOOL;
zend_register_constant(&c TSRMLS_CC);

c.name = zend_strndup(ZEND_STRL("NULL"));
c.name_len = sizeof("NULL");
c.value.type = IS_NULL;
zend_register_constant(&c TSRMLS_CC);

c.flags = CONST_PERSISTENT | CONST_CS;

c.name = zend_strndup(ZEND_STRL("ZEND_THREAD_SAFE"));
c.name_len = sizeof("ZEND_THREAD_SAFE");
c.value.value.lval = ZTS_V;
c.value.type = IS_BOOL;
zend_register_constant(&c TSRMLS_CC);

c.name = zend_strndup(ZEND_STRL("ZEND_DEBUG_BUILD"));
c.name_len = sizeof("ZEND_DEBUG_BUILD");
c.value.value.lval = ZEND_DEBUG;
c.value.type = IS_BOOL;
zend_register_constant(&c TSRMLS_CC);
}
}


int zend_shutdown_constants(TSRMLS_D)
{
zend_hash_destroy(EG(zend_constants));
free(EG(zend_constants));
return SUCCESS;
}


void clean_non_persistent_constants(TSRMLS_D)
{
if (EG(full_tables_cleanup)) {
zend_hash_apply(EG(zend_constants), (apply_func_t) clean_non_persistent_constant_full TSRMLS_CC);
} else {
zend_hash_reverse_apply(EG(zend_constants), (apply_func_t) clean_non_persistent_constant TSRMLS_CC);
}
}


ZEND_API void zend_register_long_constant(const char *name, uint name_len, long lval, int flags, int module_number TSRMLS_DC)
{
zend_constant c;

c.value.type = IS_LONG;
c.value.value.lval = lval;
c.flags = flags;
c.name = zend_strndup(name, name_len-1);
c.name_len = name_len;
c.module_number = module_number;
zend_register_constant(&c TSRMLS_CC);
}


ZEND_API void zend_register_double_constant(const char *name, uint name_len, double dval, int flags, int module_number TSRMLS_DC)
{
zend_constant c;

c.value.type = IS_DOUBLE;
c.value.value.dval = dval;
c.flags = flags;
c.name = zend_strndup(name, name_len-1);
c.name_len = name_len;
c.module_number = module_number;
zend_register_constant(&c TSRMLS_CC);
}


ZEND_API void zend_register_stringl_constant(const char *name, uint name_len, char *strval, uint strlen, int flags, int module_number TSRMLS_DC)
{
zend_constant c;

c.value.type = IS_STRING;
c.value.value.str.val = strval;
c.value.value.str.len = strlen;
c.flags = flags;
c.name = zend_strndup(name, name_len-1);
c.name_len = name_len;
c.module_number = module_number;
zend_register_constant(&c TSRMLS_CC);
}


ZEND_API void zend_register_string_constant(const char *name, uint name_len, char *strval, int flags, int module_number TSRMLS_DC)
{
zend_register_stringl_constant(name, name_len, strval, strlen(strval), flags, module_number TSRMLS_CC);
}

static int zend_get_special_constant(const char *name, uint name_len, zend_constant **c TSRMLS_DC)
{
int ret;
static char haltoff[] = "__COMPILER_HALT_OFFSET__";

if (!EG(in_execution)) {
return 0;
} else if (name_len == sizeof("__CLASS__")-1 &&
!memcmp(name, "__CLASS__", sizeof("__CLASS__")-1)) {
zend_constant tmp;

/* Returned constants may be cached, so they have to be stored */
if (EG(scope) && EG(scope)->name) {
int const_name_len;
char *const_name;
ALLOCA_FLAG(use_heap)

const_name_len = sizeof("\0__CLASS__") + EG(scope)->name_length;
const_name = do_alloca(const_name_len, use_heap);
memcpy(const_name, "\0__CLASS__", sizeof("\0__CLASS__")-1);
zend_str_tolower_copy(const_name + sizeof("\0__CLASS__")-1, EG(scope)->name, EG(scope)->name_length);
if (zend_hash_find(EG(zend_constants), const_name, const_name_len, (void**)c) == FAILURE) {
zend_hash_add(EG(zend_constants), const_name, const_name_len, (void*)&tmp, sizeof(zend_constant), (void**)c);
memset(*c, 0, sizeof(zend_constant));
Z_STRVAL((**c).value) = estrndup(EG(scope)->name, EG(scope)->name_length);
Z_STRLEN((**c).value) = EG(scope)->name_length;
Z_TYPE((**c).value) = IS_STRING;
}
free_alloca(const_name, use_heap);
} else {
if (zend_hash_find(EG(zend_constants), "\0__CLASS__", sizeof("\0__CLASS__"), (void**)c) == FAILURE) {
zend_hash_add(EG(zend_constants), "\0__CLASS__", sizeof("\0__CLASS__"), (void*)&tmp, sizeof(zend_constant), (void**)c);
memset(*c, 0, sizeof(zend_constant));
Z_STRVAL((**c).value) = estrndup("", 0);
Z_STRLEN((**c).value) = 0;
Z_TYPE((**c).value) = IS_STRING;
}
}
return 1;
} else if (name_len == sizeof("__COMPILER_HALT_OFFSET__")-1 &&
!memcmp(name, "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1)) {
const char *cfilename;
char *haltname;
int len, clen;

cfilename = zend_get_executed_filename(TSRMLS_C);
clen = strlen(cfilename);
/* check for __COMPILER_HALT_OFFSET__ */
zend_mangle_property_name(&haltname, &len, haltoff,
sizeof("__COMPILER_HALT_OFFSET__") - 1, cfilename, clen, 0);
ret = zend_hash_find(EG(zend_constants), haltname, len+1, (void **) c);
efree(haltname);
return (ret == SUCCESS);
} else {
return 0;
}
}


ZEND_API int zend_get_constant(const char *name, uint name_len, zval *result TSRMLS_DC)
{
zend_constant *c;
int retval = 1;
char *lookup_name;

if (zend_hash_find(EG(zend_constants), name, name_len+1, (void **) &c) == FAILURE) {
lookup_name = zend_str_tolower_dup(name, name_len);

if (zend_hash_find(EG(zend_constants), lookup_name, name_len+1, (void **) &c)==SUCCESS) {
if (c->flags & CONST_CS) {
retval=0;
}
} else {
retval = zend_get_special_constant(name, name_len, &c TSRMLS_CC);
}
efree(lookup_name);
}

if (retval) {
*result = c->value;
zval_copy_ctor(result);
Z_SET_REFCOUNT_P(result, 1);
Z_UNSET_ISREF_P(result);
}

return retval;
}

ZEND_API int zend_get_constant_ex(const char *name, uint name_len, zval *result, zend_class_entry *scope, ulong flags TSRMLS_DC)
{
zend_constant *c;
int retval = 1;
const char *colon;
zend_class_entry *ce = NULL;
char *class_name;
zval **ret_constant;

/* Skip leading \\ */
if (name[0] == '\\') {
name += 1;
name_len -= 1;
}


if ((colon = zend_memrchr(name, ':', name_len)) &&
colon > name && (*(colon - 1) == ':')) {
int class_name_len = colon - name - 1;
int const_name_len = name_len - class_name_len - 2;
const char *constant_name = colon + 1;
char *lcname;

class_name = estrndup(name, class_name_len);
lcname = zend_str_tolower_dup(class_name, class_name_len);
if (!scope) {
if (EG(in_execution)) {
scope = EG(scope);
} else {
scope = CG(active_class_entry);
}
}

if (class_name_len == sizeof("self")-1 &&
!memcmp(lcname, "self", sizeof("self")-1)) {
if (scope) {
ce = scope;
} else {
zend_error(E_ERROR, "Cannot access self:: when no class scope is active");
retval = 0;
}
efree(lcname);
} else if (class_name_len == sizeof("parent")-1 &&
!memcmp(lcname, "parent", sizeof("parent")-1)) {
if (!scope) {
zend_error(E_ERROR, "Cannot access parent:: when no class scope is active");
} else if (!scope->parent) {
zend_error(E_ERROR, "Cannot access parent:: when current class scope has no parent");
} else {
ce = scope->parent;
}
efree(lcname);
} else if (class_name_len == sizeof("static")-1 &&
!memcmp(lcname, "static", sizeof("static")-1)) {
if (EG(called_scope)) {
ce = EG(called_scope);
} else {
zend_error(E_ERROR, "Cannot access static:: when no class scope is active");
}
efree(lcname);
} else {
efree(lcname);
ce = zend_fetch_class(class_name, class_name_len, flags TSRMLS_CC);
}
if (retval && ce) {
if (zend_hash_find(&ce->constants_table, constant_name, const_name_len+1, (void **) &ret_constant) != SUCCESS) {
retval = 0;
if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
zend_error(E_ERROR, "Undefined class constant '%s::%s'", class_name, constant_name);
}
}
} else if (!ce) {
retval = 0;
}
efree(class_name);
goto finish;
}

/* non-class constant */
if ((colon = zend_memrchr(name, '\\', name_len)) != NULL) {
/* compound constant name */
int prefix_len = colon - name;
int const_name_len = name_len - prefix_len - 1;
const char *constant_name = colon + 1;
char *lcname;
int found_const = 0;

lcname = zend_str_tolower_dup(name, prefix_len);
/* Check for namespace constant */

/* Concatenate lowercase namespace name and constant name */
lcname = erealloc(lcname, prefix_len + 1 + const_name_len + 1);
lcname[prefix_len] = '\\';
memcpy(lcname + prefix_len + 1, constant_name, const_name_len + 1);

if (zend_hash_find(EG(zend_constants), lcname, prefix_len + 1 + const_name_len + 1, (void **) &c) == SUCCESS) {
found_const = 1;
} else {
/* try lowercase */
zend_str_tolower(lcname + prefix_len + 1, const_name_len);
if (zend_hash_find(EG(zend_constants), lcname, prefix_len + 1 + const_name_len + 1, (void **) &c) == SUCCESS) {
if ((c->flags & CONST_CS) == 0) {
found_const = 1;
}
}
}
efree(lcname);
if(found_const) {
*result = c->value;
zval_update_constant_ex(&result, (void*)1, NULL TSRMLS_CC);
zval_copy_ctor(result);
Z_SET_REFCOUNT_P(result, 1);
Z_UNSET_ISREF_P(result);
return 1;
}
/* name requires runtime resolution, need to check non-namespaced name */
if ((flags & IS_CONSTANT_UNQUALIFIED) != 0) {
name = constant_name;
name_len = const_name_len;
return zend_get_constant(name, name_len, result TSRMLS_CC);
}
retval = 0;
finish:
if (retval) {
zval_update_constant_ex(ret_constant, (void*)1, ce TSRMLS_CC);
*result = **ret_constant;
zval_copy_ctor(result);
INIT_PZVAL(result);
}

return retval;
}

return zend_get_constant(name, name_len, result TSRMLS_CC);
}

zend_constant *zend_quick_get_constant(const zend_literal *key, ulong flags TSRMLS_DC)
{
zend_constant *c;

if (zend_hash_quick_find(EG(zend_constants), Z_STRVAL(key->constant), Z_STRLEN(key->constant) + 1, key->hash_value, (void **) &c) == FAILURE) {
key++;
if (zend_hash_quick_find(EG(zend_constants), Z_STRVAL(key->constant), Z_STRLEN(key->constant) + 1, key->hash_value, (void **) &c) == FAILURE ||
(c->flags & CONST_CS) != 0) {
if ((flags & (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) == (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) {
key++;
if (zend_hash_quick_find(EG(zend_constants), Z_STRVAL(key->constant), Z_STRLEN(key->constant) + 1, key->hash_value, (void **) &c) == FAILURE) {
key++;
if (zend_hash_quick_find(EG(zend_constants), Z_STRVAL(key->constant), Z_STRLEN(key->constant) + 1, key->hash_value, (void **) &c) == FAILURE ||
(c->flags & CONST_CS) != 0) {

key--;
if (!zend_get_special_constant(Z_STRVAL(key->constant), Z_STRLEN(key->constant), &c TSRMLS_CC)) {
return NULL;
}
}
}
} else {
key--;
if (!zend_get_special_constant(Z_STRVAL(key->constant), Z_STRLEN(key->constant), &c TSRMLS_CC)) {
return NULL;
}
}
}
}
return c;
}

ZEND_API int zend_register_constant(zend_constant *c TSRMLS_DC)
{
char *lowercase_name = NULL;
char *name;
int ret = SUCCESS;
ulong chash = 0;

#if 0
printf("Registering constant for module %d\n", c->module_number);
#endif

if (!(c->flags & CONST_CS)) {
/* keep in mind that c->name_len already contains the '\0' */
lowercase_name = estrndup(c->name, c->name_len-1);
zend_str_tolower(lowercase_name, c->name_len-1);
lowercase_name = (char*)zend_new_interned_string(lowercase_name, c->name_len, 1 TSRMLS_CC);
name = lowercase_name;
chash = IS_INTERNED(lowercase_name) ? INTERNED_HASH(lowercase_name) : 0;
} else {
char *slash = strrchr(c->name, '\\');
if(slash) {
lowercase_name = estrndup(c->name, c->name_len-1);
zend_str_tolower(lowercase_name, slash-c->name);
lowercase_name = (char*)zend_new_interned_string(lowercase_name, c->name_len, 1 TSRMLS_CC);
name = lowercase_name;

chash = IS_INTERNED(lowercase_name) ? INTERNED_HASH(lowercase_name) : 0;
} else {
name = c->name;
}
}
if (chash == 0) {
chash = zend_hash_func(name, c->name_len);
}

/* Check if the user is trying to define the internal pseudo constant name __COMPILER_HALT_OFFSET__ */
if ((c->name_len == sizeof("__COMPILER_HALT_OFFSET__")
&& !memcmp(name, "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1))
|| zend_hash_quick_add(EG(zend_constants), name, c->name_len, chash, (void *) c, sizeof(zend_constant), NULL)==FAILURE) {

/* The internal __COMPILER_HALT_OFFSET__ is prefixed by NULL byte */
if (c->name[0] == '\0' && c->name_len > sizeof("\0__COMPILER_HALT_OFFSET__")
&& memcmp(name, "\0__COMPILER_HALT_OFFSET__", sizeof("\0__COMPILER_HALT_OFFSET__")) == 0) {
name++;
}
zend_error(E_NOTICE,"Constant %s already defined", name);
str_free(c->name);
if (!(c->flags & CONST_PERSISTENT)) {
zval_dtor(&c->value);
}
ret = FAILURE;
}
if (lowercase_name && !IS_INTERNED(lowercase_name)) {
efree(lowercase_name);
}
return ret;
}


/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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