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Fix segfault in exception class creation

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We can't safely lookup the Exception class entry at MINIT time, but we
can just use zend_ce_exception instead, which will be a bit faster too.
This commit is contained in:
Olly Betts 2021-05-04 11:34:24 +12:00
commit 6e6d720d88
2 changed files with 41 additions and 49 deletions
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89
Source/Modules/php.cxx
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@ -82,10 +82,9 @@ static String *fake_class_name() {
}
Printf(s_creation, "/* class entry for %s */\n",result);
Printf(s_creation, "zend_class_entry *SWIGTYPE_%s_ce;\n\n",result);
Printf(s_oinit, "\n{\n zend_class_entry internal_ce;\n");
Printf(s_oinit, " INIT_CLASS_ENTRY(internal_ce, \"%s\", class_%s_functions);\n", result, result);
Printf(s_oinit, " SWIGTYPE_%s_ce = zend_register_internal_class(&internal_ce);\n", result);
Printf(s_oinit, "}\n\n", result);
Printf(s_oinit, "\n");
}
return result;
}
@ -214,13 +213,11 @@ static void SwigPHP_emit_pointer_type_registrations() {
Printf(s_creation, "/* class entry for pointer to %s */\n", type);
Printf(s_creation, "zend_class_entry *SWIGTYPE_%s_ce;\n\n", type);
Printf(s_oinit, "{\n");
Printf(s_oinit, " zend_class_entry internal_ce;\n");
Printf(s_oinit, " INIT_CLASS_ENTRY(internal_ce, \"%s\\\\%s\", NULL);\n", "SWIG", type);
Printf(s_oinit, " SWIGTYPE_%s_ce = zend_register_internal_class(&internal_ce);\n", type);
Printf(s_oinit, " SWIGTYPE_%s_ce->create_object = swig_ptr_object_new;\n", type);
Printf(s_oinit, " SWIG_TypeClientData(SWIGTYPE%s,SWIGTYPE_%s_ce);\n", type, type);
Printf(s_oinit, "}\n\n");
Printf(s_oinit, "\n");
ki = Next(ki);
}
@ -890,9 +887,9 @@ public:
return false;
}
void generate_magic_property_methods(Node *class_node, String *baseClassExtend) {
if (Cmp(baseClassExtend, "Exception") == 0 || !is_class_wrapped(baseClassExtend)) {
baseClassExtend = NULL;
void generate_magic_property_methods(Node *class_node, String *base_class) {
if (Equal(base_class, "Exception") || !is_class_wrapped(base_class)) {
base_class = NULL;
}
// Ensure arginfo_1 and arginfo_2 exist.
@ -938,8 +935,8 @@ public:
"}\n", NIL);
}
Printf(f->code, "} else {\n");
if (baseClassExtend) {
Printf(f->code, "PHP_MN(%s___set)(INTERNAL_FUNCTION_PARAM_PASSTHRU);\n}\n", baseClassExtend);
if (base_class) {
Printf(f->code, "PHP_MN(%s___set)(INTERNAL_FUNCTION_PARAM_PASSTHRU);\n}\n", base_class);
} else {
Printf(f->code, "add_property_zval_ex(ZEND_THIS, ZSTR_VAL(arg2), ZSTR_LEN(arg2), &args[1]);\n}\n");
}
@ -971,8 +968,8 @@ public:
Printf(f->code, "\nelse if (strcmp(ZSTR_VAL(arg2),\"thisown\") == 0) {\n");
Printf(f->code, "if(arg->newobject) {\nRETVAL_LONG(1);\n}\nelse {\nRETVAL_LONG(0);\n}\n}\n\n");
Printf(f->code, "else {\n");
if (baseClassExtend) {
Printf(f->code, "PHP_MN(%s___get)(INTERNAL_FUNCTION_PARAM_PASSTHRU);\n}\n", baseClassExtend);
if (base_class) {
Printf(f->code, "PHP_MN(%s___get)(INTERNAL_FUNCTION_PARAM_PASSTHRU);\n}\n", base_class);
} else {
// __get is only called if the property isn't set on the zend_object.
Printf(f->code, "RETVAL_NULL();\n}\n");
@ -1005,8 +1002,8 @@ public:
Append(f->code, magic_isset);
}
Printf(f->code, "else {\n");
if (baseClassExtend) {
Printf(f->code, "PHP_MN(%s___isset)(INTERNAL_FUNCTION_PARAM_PASSTHRU);\n}\n", baseClassExtend);
if (base_class) {
Printf(f->code, "PHP_MN(%s___isset)(INTERNAL_FUNCTION_PARAM_PASSTHRU);\n}\n", base_class);
} else {
// __isset is only called if the property isn't set on the zend_object.
Printf(f->code, "RETVAL_FALSE;\n}\n");
@ -1572,15 +1569,12 @@ public:
virtual int classHandler(Node *n) {
String *symname = Getattr(n, "sym:name");
String *baseClassExtend = NULL;
bool exceptionClassFlag = false;
String *base_class = NULL;
class_name = symname;
Printf(all_cs_entry, "static zend_function_entry class_%s_functions[] = {\n", class_name);
Printf(s_oinit, "\n{\n zend_class_entry internal_ce;\n");
// namespace code to introduce namespaces into wrapper classes.
//if (nameSpace != NULL)
//Printf(s_oinit, "INIT_CLASS_ENTRY(internal_ce, \"%s\\\\%s\", class_%s_functions);\n", nameSpace, class_name, class_name);
@ -1597,43 +1591,40 @@ public:
List *baselist = Getattr(n, "bases");
if (baselist) {
Iterator base = First(baselist);
while (base.item && GetFlag(base.item, "feature:ignore")) {
base = Next(base);
}
if (base.item)
baseClassExtend = Getattr(base.item, "sym:name");
base = Next(base);
if (base.item) {
/* Warn about multiple inheritance for additional base class(es) */
while (base.item) {
if (GetFlag(base.item, "feature:ignore")) {
base = Next(base);
continue;
while (base.item) {
if (!GetFlag(base.item, "feature:ignore")) {
if (!base_class) {
base_class = Getattr(base.item, "sym:name");
} else {
/* Warn about multiple inheritance for additional base class(es) */
String *proxyclassname = SwigType_str(Getattr(n, "classtypeobj"), 0);
String *baseclassname = SwigType_str(Getattr(base.item, "name"), 0);
Swig_warning(WARN_PHP_MULTIPLE_INHERITANCE, input_file, line_number,
"Warning for %s, base %s ignored. Multiple inheritance is not supported in PHP.\n", proxyclassname, baseclassname);
}
String *proxyclassname = SwigType_str(Getattr(n, "classtypeobj"), 0);
String *baseclassname = SwigType_str(Getattr(base.item, "name"), 0);
Swig_warning(WARN_PHP_MULTIPLE_INHERITANCE, input_file, line_number,
"Warning for %s, base %s ignored. Multiple inheritance is not supported in PHP.\n", proxyclassname, baseclassname);
base = Next(base);
}
base = Next(base);
}
}
}
if (Cmp(Getattr(n, "feature:exceptionclass"), "1") == 0 && Getattr(n, "feature:except")) {
if (baseClassExtend) {
Swig_warning(WARN_PHP_MULTIPLE_INHERITANCE, input_file, line_number,
"Warning for %s, base %s ignored. Multiple inheritance is not supported in PHP.\n", class_name, baseClassExtend);
}
baseClassExtend = NewString(class_name);
Append(baseClassExtend, "_Exception");
Printf(s_oinit, " zend_class_entry *SWIGTYPE_%s_ce = zend_lookup_class(zend_string_init(\"Exception\", sizeof(\"Exception\") - 1, 0));\n", baseClassExtend);
exceptionClassFlag = true;
if (GetFlag(n, "feature:exceptionclass") && Getattr(n, "feature:except")) {
/* PHP requires thrown objects to be instances of or derived from
* Exception, so that really needs to take priority over any
* explicit base class.
*/
if (base_class) {
String *proxyclassname = SwigType_str(Getattr(n, "classtypeobj"), 0);
Swig_warning(WARN_PHP_MULTIPLE_INHERITANCE, input_file, line_number,
"Warning for %s, base %s ignored. Multiple inheritance is not supported in PHP.\n", proxyclassname, base_class);
}
base_class = NewString("Exception");
}
if (baseClassExtend && (exceptionClassFlag || is_class_wrapped(baseClassExtend))) {
Printf(s_oinit, " SWIGTYPE_%s_ce = zend_register_internal_class_ex(&internal_ce, SWIGTYPE_%s_ce);\n", class_name, baseClassExtend);
if (Equal(base_class, "Exception")) {
Printf(s_oinit, " SWIGTYPE_%s_ce = zend_register_internal_class_ex(&internal_ce, zend_ce_exception);\n", class_name);
} else if (is_class_wrapped(base_class)) {
Printf(s_oinit, " SWIGTYPE_%s_ce = zend_register_internal_class_ex(&internal_ce, SWIGTYPE_%s_ce);\n", class_name, base_class);
} else {
Printf(s_oinit, " SWIGTYPE_%s_ce = zend_register_internal_class(&internal_ce);\n", class_name);
}
@ -1678,12 +1669,12 @@ public:
Printf(s_oinit, "#ifdef SWIGTYPE_p%s\n", SwigType_manglestr(Getattr(n, "classtypeobj")));
Printf(s_oinit, " SWIG_TypeClientData(SWIGTYPE_p%s,SWIGTYPE_%s_ce);\n", SwigType_manglestr(Getattr(n, "classtypeobj")), class_name);
Printf(s_oinit, "#endif\n");
Printf(s_oinit, "}\n\n");
Printf(s_oinit, "\n");
Language::classHandler(n);
print_creation_free_wrapper(n);
generate_magic_property_methods(n, baseClassExtend);
generate_magic_property_methods(n, base_class);
Printf(all_cs_entry, " ZEND_FE_END\n};\n\n");
class_name = NULL;