Implement reflection constant

Fixes phpGH-13570

Author: iluuu1994

ext/reflection/php_reflection.c

@@ -97,6 +97,7 @@ PHPAPI zend_class_entry *reflection_enum_ptr;
 PHPAPI zend_class_entry *reflection_enum_unit_case_ptr;
 PHPAPI zend_class_entry *reflection_enum_backed_case_ptr;
 PHPAPI zend_class_entry *reflection_fiber_ptr;
+PHPAPI zend_class_entry *reflection_constant_ptr;
 
 /* Exception throwing macro */
 #define _DO_THROW(msg) \
@@ -7207,6 +7208,68 @@ static zval *_reflection_write_property(zend_object *object, zend_string *name,
 }
 /* }}} */
 
+ZEND_METHOD(ReflectionConstant, __construct)
+{
+	zend_string *const_name;
+
+	zval *object = ZEND_THIS;
+	reflection_object *intern = Z_REFLECTION_P(object);
+
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_STR(const_name)
+	ZEND_PARSE_PARAMETERS_END();
+
+	zval *const_zv = zend_get_constant(const_name);
+	if (!const_zv) {
+		zend_throw_exception_ex(reflection_exception_ptr, 0, "Constant \"%s\" does not exist", ZSTR_VAL(const_name));
+		RETURN_THROWS();
+	}
+
+	zend_constant *const_ = (zend_constant*)((uintptr_t)const_zv - XtOffsetOf(zend_constant, value));
+
+	intern->ptr = const_;
+	intern->ref_type = REF_TYPE_OTHER;
+}
+
+ZEND_METHOD(ReflectionConstant, getName)
+{
+	reflection_object *intern;
+	zend_constant *const_;
+
+	if (zend_parse_parameters_none() == FAILURE) {
+		RETURN_THROWS();
+	}
+
+	GET_REFLECTION_OBJECT_PTR(const_);
+	RETURN_STR_COPY(const_->name);
+}
+
+ZEND_METHOD(ReflectionConstant, getValue)
+{
+	reflection_object *intern;
+	zend_constant *const_;
+
+	if (zend_parse_parameters_none() == FAILURE) {
+		RETURN_THROWS();
+	}
+
+	GET_REFLECTION_OBJECT_PTR(const_);
+	RETURN_COPY(&const_->value);
+}
+
+ZEND_METHOD(ReflectionConstant, isDeprecated)
+{
+	reflection_object *intern;
+	zend_constant *const_;
+
+	if (zend_parse_parameters_none() == FAILURE) {
+		RETURN_THROWS();
+	}
+
+	GET_REFLECTION_OBJECT_PTR(const_);
+	RETURN_BOOL(ZEND_CONSTANT_FLAGS(const_) & CONST_DEPRECATED);
+}
+
 PHP_MINIT_FUNCTION(reflection) /* {{{ */
 {
 	memcpy(&reflection_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));
@@ -7306,6 +7369,10 @@ PHP_MINIT_FUNCTION(reflection) /* {{{ */
 	reflection_fiber_ptr->create_object = reflection_objects_new;
 	reflection_fiber_ptr->default_object_handlers = &reflection_object_handlers;
 
+	reflection_constant_ptr = register_class_ReflectionConstant();
+	reflection_constant_ptr->create_object = reflection_objects_new;
+	reflection_constant_ptr->default_object_handlers = &reflection_object_handlers;
+
 	REFLECTION_G(key_initialized) = 0;
 
 	return SUCCESS;

ext/reflection/php_reflection.stub.php

@@ -829,3 +829,15 @@ public function getCallable(): callable {}
 
     public function getTrace(int $options = DEBUG_BACKTRACE_PROVIDE_OBJECT): array {}
 }
+
+/** @not-serializable */
+final class ReflectionConstant
+{
+    public function __construct(string $name) {}
+
+    public function getName(): string {}
+
+    public function getValue(): mixed {}
+
+    public function isDeprecated(): bool {}
+}

ext/reflection/php_reflection_arginfo.h

@@ -0,0 +1,17 @@
+--TEST--
+ReflectionConstant::getName()
+--EXTENSIONS--
+zend_test
+--FILE--
+<?php
+
+$reflectionConstant = new ReflectionConstant('ZEND_CONSTANT_A');
+var_dump($reflectionConstant->getName());
+
+$reflectionConstant = new ReflectionConstant('ZEND_TEST_DEPRECATED');
+var_dump($reflectionConstant->getName());
+
+?>
+--EXPECT--
+string(15) "ZEND_CONSTANT_A"
+string(20) "ZEND_TEST_DEPRECATED"

ext/reflection/tests/ReflectionConstant_getName.phpt

@@ -0,0 +1,17 @@
+--TEST--
+ReflectionConstant::getValue()
+--EXTENSIONS--
+zend_test
+--FILE--
+<?php
+
+$reflectionConstant = new ReflectionConstant('ZEND_CONSTANT_A');
+var_dump($reflectionConstant->getValue());
+
+$reflectionConstant = new ReflectionConstant('ZEND_TEST_DEPRECATED');
+var_dump($reflectionConstant->getValue());
+
+?>
+--EXPECT--
+string(6) "global"
+int(42)

ext/reflection/tests/ReflectionConstant_getValue.phpt

@@ -0,0 +1,17 @@
+--TEST--
+ReflectionConstant::isDeprecated()
+--EXTENSIONS--
+zend_test
+--FILE--
+<?php
+
+$reflectionConstant = new ReflectionConstant('ZEND_CONSTANT_A');
+var_dump($reflectionConstant->isDeprecated());
+
+$reflectionConstant = new ReflectionConstant('ZEND_TEST_DEPRECATED');
+var_dump($reflectionConstant->isDeprecated());
+
+?>
+--EXPECT--
+bool(false)
+bool(true)