Add PhpAttribute, PhpCompilerAttribute and simple validator

Zend/tests/attributes/compiler_attributes.phpt

@@ -0,0 +1,14 @@
+--TEST--
+attributes: Add PhpCompilerAttribute
+--FILE--
+<?php
+
+<<PhpCompilerAttribute>>
+class Foo
+{
+}
+
+$ref = new ReflectionClass(Foo::class);
+var_dump($ref->getAttributes()[0]->getAsObject());
+--EXPECTF--
+Fatal error: The PhpCompilerAttribute can only be used by internal classes, use PhpAttribute instead in %s

Zend/tests/attributes/rfcexample.phpt

@@ -0,0 +1,41 @@
+--TEST--
+Attributes: RFC Example
+--FILE--
+<?php
+namespace My\Attributes {
+    use PhpAttribute;
+
+    <<PhpAttribute>>
+    class SingleArgument {
+        public $argumentValue;
+
+        public function __construct($argumentValue) {
+             $this->argumentValue = $argumentValue;
+        }
+    }
+}
+
+namespace {
+    use My\Attributes\SingleArgument;
+
+    <<SingleArgument("Hello World")>>
+    class Foo {
+    }
+
+    $reflectionClass = new \ReflectionClass(Foo::class);
+    $attributes = $reflectionClass->getAttributes();
+
+    var_dump($attributes[0]->getName());
+    var_dump($attributes[0]->getArguments());
+    var_dump($attributes[0]->getAsObject());
+}
+--EXPECTF--
+string(28) "My\Attributes\SingleArgument"
+array(1) {
+  [0]=>
+  string(11) "Hello World"
+}
+object(My\Attributes\SingleArgument)#3 (1) {
+  ["argumentValue"]=>
+  string(11) "Hello World"
+}

Zend/tests/attributes/wrong_atttribution.phpt

@@ -0,0 +1,9 @@
+--TEST--
+Attributes: Prevent PhpAttribute on non classes
+--FILE--
+<?php
+
+<<PhpAttribute>>
+function foo() {}
+--EXPECTF--
+Fatal error: Only classes can be marked with <<PhpAttribute>> in %s

Zend/zend_attributes.c

@@ -0,0 +1,44 @@
+#include "zend.h"
+#include "zend_API.h"
+#include "zend_attributes.h"
+
+void zend_attribute_validate_phpattribute(zval *attribute, int target)
+{
+	if (target != ZEND_ATTRIBUTE_TARGET_CLASS) {
+		zend_error(E_COMPILE_ERROR, "Only classes can be marked with <<PhpAttribute>>");
+	}
+}
+
+void zend_attribute_validate_phpcompilerattribute(zval *attribute, int target)
+{
+	zend_error(E_COMPILE_ERROR, "The PhpCompilerAttribute can only be used by internal classes, use PhpAttribute instead");
+}
+
+void zend_register_attribute_ce(void)
+{
+	zend_hash_init(&zend_attributes_internal_validators, 8, NULL, NULL, 1);
+
+	zend_class_entry ce;
+	zend_attributes_internal_validator cb;
+
+	INIT_CLASS_ENTRY(ce, "PhpAttribute", NULL);
+	zend_ce_php_attribute = zend_register_internal_class(&ce);
+	zend_ce_php_attribute->ce_flags |= ZEND_ACC_FINAL;
+
+	cb = zend_attribute_validate_phpattribute;
+	zend_compiler_attribute_register(zend_ce_php_attribute, &cb);
+
+	INIT_CLASS_ENTRY(ce, "PhpCompilerAttribute", NULL);
+	zend_ce_php_compiler_attribute = zend_register_internal_class(&ce);
+	zend_ce_php_compiler_attribute->ce_flags |= ZEND_ACC_FINAL;
+
+	cb = zend_attribute_validate_phpcompilerattribute;
+	zend_compiler_attribute_register(zend_ce_php_compiler_attribute, &cb);
+}
+
+void zend_compiler_attribute_register(zend_class_entry *ce, zend_attributes_internal_validator *validator)
+{
+	zend_string *attribute_name = zend_string_tolower_ex(ce->name, 1);
+
+	zend_hash_update_mem(&zend_attributes_internal_validators, attribute_name, validator, sizeof(zend_attributes_internal_validator));
+}

Zend/zend_attributes.h

@@ -0,0 +1,20 @@
+#ifndef ZEND_ATTRIBUTES_H
+#define ZEND_ATTRIBUTES_H
+
+#define ZEND_ATTRIBUTE_TARGET_CLASS			1
+#define ZEND_ATTRIBUTE_TARGET_FUNCTION		2
+#define ZEND_ATTRIBUTE_TARGET_METHOD		4
+#define ZEND_ATTRIBUTE_TARGET_PROPERTY		8
+#define ZEND_ATTRIBUTE_TARGET_CLASS_CONST	16
+#define ZEND_ATTRIBUTE_TARGET_PARAMETER		32
+#define ZEND_ATTRIBUTE_TARGET_ALL			63
+
+zend_class_entry *zend_ce_php_attribute;
+zend_class_entry *zend_ce_php_compiler_attribute;
+
+typedef void (*zend_attributes_internal_validator)(zval *attribute, int target);
+HashTable zend_attributes_internal_validators;
+
+void zend_compiler_attribute_register(zend_class_entry *ce, zend_attributes_internal_validator *validator);
+void zend_register_attribute_ce(void);
+#endif

Zend/zend_compile.c

@@ -20,6 +20,7 @@
 
 #include <zend_language_parser.h>
 #include "zend.h"
+#include "zend_attributes.h"
 #include "zend_compile.h"
 #include "zend_constants.h"
 #include "zend_llist.h"
@@ -5742,14 +5743,16 @@ static void zend_compile_attribute(zval *v, zend_ast *ast) /* {{{ */
 }
 /* }}} */
 
-static HashTable *zend_compile_attributes(zend_ast *ast) /* {{{ */
+static HashTable *zend_compile_attributes(zend_ast *ast, int target) /* {{{ */
 {
 	HashTable *attr;
 
 	zend_ast_list *list;
 	uint32_t i;
 
 	zval tmp;
+	zend_attributes_internal_validator *validator = NULL;
+	zend_attributes_internal_validator cb;
 
 	ZVAL_NULL(&tmp);
 
@@ -5770,6 +5773,14 @@ static HashTable *zend_compile_attributes(zend_ast *ast) /* {{{ */
 		name = zend_string_tolower(Z_STR_P(zend_hash_index_find(Z_ARRVAL(a), 0)));
 		x = zend_hash_find(attr, name);
 
+		// validate internal attribute
+		validator = (zend_attributes_internal_validator*)zend_hash_find_ptr(&zend_attributes_internal_validators, name);
+
+		if (validator != NULL) {
+			cb = *validator;
+			cb(&a, target);
+		}
+
 		if (x) {
 			ZEND_ASSERT(Z_TYPE_P(x) == IS_ARRAY);
 
@@ -5910,7 +5921,7 @@ void zend_compile_params(zend_ast *ast, zend_ast *return_type_ast, uint32_t fall
 				zend_hash_init(op_array->attributes, 8, NULL, ZVAL_PTR_DTOR, 0);
 			}
 
-			ZVAL_ARR(&attr, zend_compile_attributes(attributes_ast));
+			ZVAL_ARR(&attr, zend_compile_attributes(attributes_ast, ZEND_ATTRIBUTE_TARGET_PARAMETER));
 			zend_hash_index_add(op_array->attributes, i, &attr);
 		}
 
@@ -6370,7 +6381,11 @@ void zend_compile_func_decl(znode *result, zend_ast *ast, zend_bool toplevel) /*
 		op_array->doc_comment = zend_string_copy(decl->doc_comment);
 	}
 	if (decl->attributes) {
-		op_array->attributes = zend_compile_attributes(decl->attributes);
+		int target = ZEND_ATTRIBUTE_TARGET_FUNCTION;
+		if (is_method) {
+			target = ZEND_ATTRIBUTE_TARGET_METHOD;
+		}
+		op_array->attributes = zend_compile_attributes(decl->attributes, target);
 	}
 	if (decl->kind == ZEND_AST_CLOSURE || decl->kind == ZEND_AST_ARROW_FUNC) {
 		op_array->fn_flags |= ZEND_ACC_CLOSURE;
@@ -6544,7 +6559,7 @@ void zend_compile_prop_group(zend_ast *list) /* {{{ */
 	zend_ast *type_ast = list->child[0];
 	zend_ast *prop_ast = list->child[1];
 
-	attributes = list->child[2] ? zend_compile_attributes(list->child[2]) : NULL;
+	attributes = list->child[2] ? zend_compile_attributes(list->child[2], ZEND_ATTRIBUTE_TARGET_PROPERTY) : NULL;
 
 	zend_compile_prop_decl(prop_ast, type_ast, list->attr, attributes);
 
@@ -6578,7 +6593,7 @@ void zend_compile_class_const_decl(zend_ast *ast, zend_ast *attr_ast) /* {{{ */
 		return;
 	}
 
-	attributes = attr_ast ? zend_compile_attributes(attr_ast) : NULL;
+	attributes = attr_ast ? zend_compile_attributes(attr_ast, ZEND_ATTRIBUTE_TARGET_CLASS_CONST) : NULL;
 
 	for (i = 0; i < list->children; ++i) {
 		zend_ast *const_ast = list->child[i];
@@ -6809,7 +6824,7 @@ zend_op *zend_compile_class_decl(zend_ast *ast, zend_bool toplevel) /* {{{ */
 		ce->info.user.doc_comment = zend_string_copy(decl->doc_comment);
 	}
 	if (decl->attributes) {
-		ce->info.user.attributes = zend_compile_attributes(decl->attributes);
+		ce->info.user.attributes = zend_compile_attributes(decl->attributes, ZEND_ATTRIBUTE_TARGET_CLASS);
 	}
 
 	if (UNEXPECTED((decl->flags & ZEND_ACC_ANON_CLASS))) {

Zend/zend_default_classes.c

@@ -19,6 +19,7 @@
 
 #include "zend.h"
 #include "zend_API.h"
+#include "zend_attributes.h"
 #include "zend_builtin_functions.h"
 #include "zend_interfaces.h"
 #include "zend_exceptions.h"
@@ -34,4 +35,5 @@ ZEND_API void zend_register_default_classes(void)
 	zend_register_closure_ce();
 	zend_register_generator_ce();
 	zend_register_weakref_ce();
+	zend_register_attribute_ce();
 }

configure.ac

@@ -1459,7 +1459,7 @@ PHP_ADD_SOURCES(Zend, \
     zend_execute_API.c zend_highlight.c zend_llist.c \
     zend_vm_opcodes.c zend_opcode.c zend_operators.c zend_ptr_stack.c zend_stack.c \
     zend_variables.c zend.c zend_API.c zend_extensions.c zend_hash.c \
-    zend_list.c zend_builtin_functions.c \
+    zend_list.c zend_builtin_functions.c zend_attributes.c \
     zend_ini.c zend_sort.c zend_multibyte.c zend_ts_hash.c zend_stream.c \
     zend_iterators.c zend_interfaces.c zend_exceptions.c zend_strtod.c zend_gc.c \
     zend_closures.c zend_weakrefs.c zend_float.c zend_string.c zend_signal.c zend_generators.c \

ext/reflection/php_reflection.c

@@ -32,6 +32,7 @@
 #include "zend.h"
 #include "zend_API.h"
 #include "zend_ast.h"
+#include "zend_attributes.h"
 #include "zend_exceptions.h"
 #include "zend_operators.h"
 #include "zend_constants.h"
@@ -6673,6 +6674,20 @@ ZEND_METHOD(reflection_attribute, getAsObject)
 		RETURN_THROWS();
 	}
 
+	zend_string *lower_name = zend_string_tolower_ex(ce->name, 1);
+
+	if (ce->type == ZEND_USER_CLASS && ce->info.user.attributes && zend_hash_str_exists(ce->info.user.attributes, "phpattribute", sizeof("phpattribute")-1) == 0) {
+		zend_string_release(lower_name);
+		zend_throw_error(NULL, "Attempting to use class '%s' as attribute that does not have <<PhpAttribute>>.", ZSTR_VAL(attr->name));
+		RETURN_THROWS();
+	} else if (ce->type == ZEND_INTERNAL_CLASS && zend_hash_exists(&zend_attributes_internal_validators, lower_name) == 0) {
+		zend_string_release(lower_name);
+		zend_throw_error(NULL, "Attempting to use internal class '%s' as attribute that does not have <<PhpCompilerAttribute>>.", ZSTR_VAL(attr->name));
+		RETURN_THROWS();
+	}
+
+	zend_string_release(lower_name);
+
 	count = zend_hash_num_elements(Z_ARRVAL(attr->arguments));
 
 	if (count) {

win32/build/config.w32

@@ -230,7 +230,7 @@ ADD_SOURCES("Zend", "zend_language_parser.c zend_language_scanner.c \
 	zend_execute_API.c zend_highlight.c \
 	zend_llist.c zend_vm_opcodes.c zend_opcode.c zend_operators.c zend_ptr_stack.c \
 	zend_stack.c zend_variables.c zend.c zend_API.c zend_extensions.c \
-	zend_hash.c zend_list.c zend_builtin_functions.c \
+	zend_hash.c zend_list.c zend_builtin_functions.c zend_attributes.c \
 	zend_ini.c zend_sort.c zend_multibyte.c zend_ts_hash.c \
 	zend_stream.c zend_iterators.c zend_interfaces.c zend_objects.c \
 	zend_object_handlers.c zend_objects_API.c \