php 对象 调用静态方法
1.BNF范式
%token T_PAAMAYIM_NEKUDOTAYIM ":: (T_PAAMAYIM_NEKUDOTAYIM)"
//类名::静态方法(...);
function_call: | class_name T_PAAMAYIM_NEKUDOTAYIM variable_name '(' { $4.u.op.opline_num = zend_do_begin_class_member_function_call(&$1, &$3 TSRMLS_CC); }
function_call_parameter_list
')' { zend_do_end_function_call($4.u.op.opline_num?NULL:&$3, &$$, &$6, $4.u.op.opline_num, $4.u.op.opline_num TSRMLS_CC); zend_do_extended_fcall_end(TSRMLS_C);}
2.调用静态方法的编译 zend_do_begin_class_member_function_call
int zend_do_begin_class_member_function_call(znode *class_name, znode *method_name TSRMLS_DC) /* {{{ */
{
znode class_node;
unsigned char *ptr = NULL;
zend_op *opline;
if (method_name->op_type == IS_CONST) {
char *lcname;
if (Z_TYPE(method_name->u.constant) != IS_STRING) {
zend_error(E_COMPILE_ERROR, "Method name must be a string");
}
lcname = zend_str_tolower_dup(Z_STRVAL(method_name->u.constant), Z_STRLEN(method_name->u.constant));
if ((sizeof(ZEND_CONSTRUCTOR_FUNC_NAME)-1) == Z_STRLEN(method_name->u.constant) &&
memcmp(lcname, ZEND_CONSTRUCTOR_FUNC_NAME, sizeof(ZEND_CONSTRUCTOR_FUNC_NAME)-1) == 0) {
zval_dtor(&method_name->u.constant);
method_name->op_type = IS_UNUSED;
}
efree(lcname);
}
if (class_name->op_type == IS_CONST &&
ZEND_FETCH_CLASS_DEFAULT == zend_get_class_fetch_type(Z_STRVAL(class_name->u.constant), Z_STRLEN(class_name->u.constant))) {
zend_resolve_class_name(class_name, ZEND_FETCH_CLASS_GLOBAL, 1 TSRMLS_CC);
class_node = *class_name;
opline = get_next_op(CG(active_op_array) TSRMLS_CC);
} else {
zend_do_fetch_class(&class_node, class_name TSRMLS_CC);
opline = get_next_op(CG(active_op_array) TSRMLS_CC);
opline->extended_value = class_node.EA ;
}
opline->opcode = ZEND_INIT_STATIC_METHOD_CALL;
if (class_node.op_type == IS_CONST) {
opline->op1_type = IS_CONST;
opline->op1.constant =
zend_add_class_name_literal(CG(active_op_array), &class_node.u.constant TSRMLS_CC); //op1.constant为数字，以方便其handler使用
} else {
SET_NODE(opline->op1, &class_node);
}
if (method_name->op_type == IS_CONST) {
opline->op2_type = IS_CONST;
opline->op2.constant =
zend_add_func_name_literal(CG(active_op_array), &method_name->u.constant TSRMLS_CC); //op2.constant为数字，以方便其handler使用
if (opline->op1_type == IS_CONST) {
GET_CACHE_SLOT(opline->op2.constant);
} else {
GET_POLYMORPHIC_CACHE_SLOT(opline->op2.constant);
}
} else {
SET_NODE(opline->op2, method_name);
}
//代码忽略
return 1; /* Dynamic */
}
static int ZEND_FASTCALL ZEND_INIT_STATIC_METHOD_CALL_SPEC_CONST_CONST_HANDLER(ZEND_OPCODE_HANDLER_ARGS)
{
USE_OPLINE
zval *function_name;
zend_class_entry *ce;
SAVE_OPLINE();
zend_ptr_stack_3_push(&EG(arg_types_stack), EX(fbc), EX(object), EX(called_scope));
if (IS_CONST == IS_CONST) {
/* no function found. try a static method in class */
if (CACHED_PTR(opline->op1.literal->cache_slot)) { //如果EG(active_op_array)->run_time_cache[]数组中存在这个值，就取出来，毕竟C原生态数组取数据速度要远远超过zend_hash_quick_find(毕竟他要计算hash值，还要遍历，不能达到真正的O(1))
ce = CACHED_PTR(opline->op1.literal->cache_slot);
} else {
ce = zend_fetch_class_by_name(Z_STRVAL_P(opline->op1.zv), Z_STRLEN_P(opline->op1.zv), opline->op1.literal + 1, opline->extended_value TSRMLS_CC);
if (UNEXPECTED(ce == NULL)) {
CHECK_EXCEPTION();
ZEND_VM_NEXT_OPCODE();
}
CACHE_PTR(opline->op1.literal->cache_slot, ce); //放入EG(active_op_array)->run_time_cache[]这个数组中,以便下次调用时提高速度
}
EX(called_scope) = ce;
} else {
//代码忽略
}
if (IS_CONST == IS_CONST &&
IS_CONST == IS_CONST &&
CACHED_PTR(opline->op2.literal->cache_slot)) {
EX(fbc) = CACHED_PTR(opline->op2.literal->cache_slot);
} else if (IS_CONST != IS_CONST &&
IS_CONST == IS_CONST &&
(EX(fbc) = CACHED_POLYMORPHIC_PTR(opline->op2.literal->cache_slot, ce))) {
/* do nothing */
} else if (IS_CONST != IS_UNUSED) {
char *function_name_strval = NULL;
int function_name_strlen = 0;
if (IS_CONST == IS_CONST) {
function_name_strval = Z_STRVAL_P(opline->op2.zv);
function_name_strlen = Z_STRLEN_P(opline->op2.zv);
} else {
//代码忽略
}
if (function_name_strval) {
if (ce->get_static_method) {
EX(fbc) = ce->get_static_method(ce, function_name_strval, function_name_strlen TSRMLS_CC);
} else {
EX(fbc) = zend_std_get_static_method(ce, function_name_strval, function_name_strlen, ((IS_CONST == IS_CONST) ? (opline->op2.literal + 1) : NULL) TSRMLS_CC);
//取出方法体
}
if (UNEXPECTED(EX(fbc) == NULL)) {
zend_error_noreturn(E_ERROR, "Call to undefined method %s::%s()", ce->name, function_name_strval);
}
if (IS_CONST == IS_CONST &&
EXPECTED(EX(fbc)->type <= ZEND_USER_FUNCTION) &&
EXPECTED((EX(fbc)->common.fn_flags & (ZEND_ACC_CALL_VIA_HANDLER|ZEND_ACC_NEVER_CACHE)) == 0)) {
if (IS_CONST == IS_CONST) {
CACHE_PTR(opline->op2.literal->cache_slot, EX(fbc));//放到EG(active_op_array)->run_time_cache[]数组中
} else {
CACHE_POLYMORPHIC_PTR(opline->op2.literal->cache_slot, ce, EX(fbc));
}
}
}
if (IS_CONST != IS_CONST) {
}
} else {
//代码省略
}
//代码省略
CHECK_EXCEPTION();
ZEND_VM_NEXT_OPCODE();
}
zend_class_entry *zend_fetch_class_by_name(const char *class_name, uint class_name_len, const zend_literal *key, int fetch_type TSRMLS_DC) /* {{{ */
{
zend_class_entry **pce;
int use_autoload = (fetch_type & ZEND_FETCH_CLASS_NO_AUTOLOAD) == 0;
if (zend_lookup_class_ex(class_name, class_name_len, key, use_autoload, &pce TSRMLS_CC) == FAILURE) {
}
return *pce;
}
ZEND_API int zend_lookup_class_ex(const char *name, int name_length, const zend_literal *key, int use_autoload, zend_class_entry ***ce TSRMLS_DC) /* {{{ */
{
zval **args[1];
zval autoload_function;
zval *class_name_ptr;
zval *retval_ptr = NULL;
int retval, lc_length;
char *lc_name;
char *lc_free;
zend_fcall_info fcall_info;
zend_fcall_info_cache fcall_cache;
char dummy = 1;
ulong hash;
ALLOCA_FLAG(use_heap)
if (key) {
lc_name = Z_STRVAL(key->constant);
lc_length = Z_STRLEN(key->constant) + 1;
hash = key->hash_value;
} else {
lc_free = lc_name = do_alloca(name_length + 1, use_heap);
zend_str_tolower_copy(lc_name, name, name_length);
lc_length = name_length + 1;
if (lc_name[0] == '\\') {
lc_name += 1;
lc_length -= 1;
}
hash = zend_inline_hash_func(lc_name, lc_length);
}
if (zend_hash_quick_find(EG(class_table), lc_name, lc_length, hash, (void **) ce) == SUCCESS) { //从EG(class_table)中找到ce
if (!key) {
free_alloca(lc_free, use_heap);
}
return SUCCESS;
}
}
3.调用静态方法的编译 zend_do_end_function_call
void zend_do_end_function_call(znode *function_name, znode *result, const znode *argument_list, int is_method, int is_dynamic_fcall TSRMLS_DC) /* {{{ */ { zend_op *opline; if (is_method && function_name && function_name->op_type == IS_UNUSED) { /* clone */ //代码省略 } else { opline = get_next_op(CG(active_op_array) TSRMLS_CC); if (!is_method && !is_dynamic_fcall && function_name->op_type==IS_CONST) { opline->opcode = ZEND_DO_FCALL; SET_NODE(opline->op1, function_name); CALCULATE_LITERAL_HASH(opline->op1.constant); GET_CACHE_SLOT(opline->op1.constant); } else { opline->opcode = ZEND_DO_FCALL_BY_NAME; //可知道， SET_UNUSED(opline->op1); } } opline->result.var = get_temporary_variable(CG(active_op_array)); opline->result_type = IS_VAR; GET_NODE(result, opline->result) ; SET_UNUSED(opline->op2); zend_stack_del_top(&CG(function_call_stack)); opline->extended_value = Z_LVAL(argument_list->u.constant); }
static int ZEND_FASTCALL ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER(ZEND_OPCODE_HANDLER_ARGS) { EX(function_state).function = EX(fbc); return zend_do_fcall_common_helper_SPEC(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU); } static int ZEND_FASTCALL zend_do_fcall_common_helper_SPEC(ZEND_OPCODE_HANDLER_ARGS) { USE_OPLINE zend_bool should_change_scope = 0; zend_function *fbc = EX(function_state).function; SAVE_OPLINE(); if (UNEXPECTED((fbc->common.fn_flags & (ZEND_ACC_ABSTRACT|ZEND_ACC_DEPRECATED)) != 0)) { if (UNEXPECTED((fbc->common.fn_flags & ZEND_ACC_ABSTRACT) != 0)) { zend_error_noreturn(E_ERROR, "Cannot call abstract method %s::%s()", fbc->common.scope->name, fbc->common.function_name); CHECK_EXCEPTION(); ZEND_VM_NEXT_OPCODE(); /* Never reached */ } if (UNEXPECTED((fbc->common.fn_flags & ZEND_ACC_DEPRECATED) != 0)) { zend_error(E_DEPRECATED, "Function %s%s%s() is deprecated", fbc->common.scope ? fbc->common.scope->name : "", fbc->common.scope ? "::" : "", fbc->common.function_name); } } if (fbc->common.scope && !(fbc->common.fn_flags & ZEND_ACC_STATIC) && !EX(object)) { if (fbc->common.fn_flags & ZEND_ACC_ALLOW_STATIC) { /* FIXME: output identifiers properly */ zend_error(E_STRICT, "Non-static method %s::%s() should not be called statically", fbc->common.scope->name, fbc->common.function_name); } else { /* FIXME: output identifiers properly */ /* An internal function assumes $this is present and won't check that. So PHP would crash by allowing the call. */ zend_error_noreturn(E_ERROR, "Non-static method %s::%s() cannot be called statically", fbc->common.scope->name, fbc->common.function_name); } } if (fbc->type == ZEND_USER_FUNCTION || fbc->common.scope) { should_change_scope = 1; EX(current_this) = EG(This); EX(current_scope) = EG(scope); EX(current_called_scope) = EG(called_scope); EG(This) = EX(object); EG(scope) = (fbc->type == ZEND_USER_FUNCTION || !EX(object)) ? fbc->common.scope : NULL; EG(called_scope) = EX(called_scope); } zend_arg_types_stack_3_pop(&EG(arg_types_stack), &EX(called_scope), &EX(current_object), &EX(fbc)); EX(function_state).arguments = zend_vm_stack_push_args(opline->extended_value TSRMLS_CC); LOAD_OPLINE(); if (fbc->type == ZEND_INTERNAL_FUNCTION) { //php内部函数 } else if (fbc->type == ZEND_USER_FUNCTION) { EX(original_return_value) = EG(return_value_ptr_ptr); EG(active_symbol_table) = NULL; EG(active_op_array) = &fbc->op_array; EG(return_value_ptr_ptr) = NULL; if (RETURN_VALUE_USED(opline)) { temp_variable *ret = &EX_T(opline->result.var); ret->var.ptr = NULL; EG(return_value_ptr_ptr) = &ret->var.ptr; ret->var.ptr_ptr = &ret->var.ptr; ret->var.fcall_returned_reference = (fbc->common.fn_flags & ZEND_ACC_RETURN_REFERENCE) != 0; } if (EXPECTED(zend_execute == execute)) { if (EXPECTED(EG(exception) == NULL)) { ZEND_VM_ENTER(); } } } else { /* ZEND_OVERLOADED_FUNCTION */ //代码省略 } }
