Merge branch 'PHP-8.3'

* PHP-8.3:
  [ci skip] NEWS for GH-15330
  [ci skip] NEWS for GH-15330
  Do not scan generator frames more than once (#15330)

Zend/tests/gh15330-001.phpt

@@ -0,0 +1,38 @@
+--TEST--
+GH-15330 001: Do not scan generator frames more than once
+--FILE--
+<?php
+
+class It implements \IteratorAggregate
+{
+    public function getIterator(): \Generator
+    {
+        yield 'foo';
+        Fiber::suspend();
+        var_dump("not executed");
+    }
+}
+
+function f() {
+    var_dump(yield from new It());
+}
+
+$iterable = f();
+
+$fiber = new Fiber(function () use ($iterable) {
+    var_dump($iterable->current());
+    $iterable->next();
+    var_dump("not executed");
+});
+
+$ref = $fiber;
+
+$fiber->start();
+
+gc_collect_cycles();
+
+?>
+==DONE==
+--EXPECT--
+string(3) "foo"
+==DONE==

Zend/tests/gh15330-002.phpt

@@ -0,0 +1,33 @@
+--TEST--
+GH-15330 002: Do not scan generator frames more than once
+--FILE--
+<?php
+
+function g() {
+    yield 'foo';
+    Fiber::suspend();
+}
+
+function f() {
+    var_dump(yield from g());
+}
+
+$iterable = f();
+
+$fiber = new Fiber(function () use ($iterable) {
+    var_dump($iterable->current());
+    $iterable->next();
+    var_dump("not executed");
+});
+
+$ref = $fiber;
+
+$fiber->start();
+
+gc_collect_cycles();
+
+?>
+==DONE==
+--EXPECT--
+string(3) "foo"
+==DONE==

Zend/tests/gh15330-003.phpt

@@ -0,0 +1,57 @@
+--TEST--
+GH-15330 003: Do not scan generator frames more than once
+--FILE--
+<?php
+
+class It implements \IteratorAggregate
+{
+    public function getIterator(): \Generator
+    {
+        yield 'foo';
+        Fiber::suspend();
+        var_dump("not executed");
+    }
+}
+
+class Canary {
+    public function __construct(public mixed $value) {}
+    public function __destruct() {
+        var_dump(__METHOD__);
+    }
+}
+
+function f($canary) {
+    var_dump(yield from new It());
+}
+
+$canary = new Canary(null);
+
+$iterable = f($canary);
+
+$fiber = new Fiber(function () use ($iterable, $canary) {
+    var_dump($canary, $iterable->current());
+    $iterable->next();
+    var_dump("not executed");
+});
+
+$canary->value = $fiber;
+
+$fiber->start();
+
+$iterable->current();
+
+$fiber = $iterable = $canary = null;
+
+gc_collect_cycles();
+
+?>
+==DONE==
+--EXPECTF--
+object(Canary)#%d (1) {
+  ["value"]=>
+  object(Fiber)#%d (0) {
+  }
+}
+string(3) "foo"
+string(18) "Canary::__destruct"
+==DONE==

Zend/tests/gh15330-004.phpt

@@ -0,0 +1,52 @@
+--TEST--
+GH-15330 004: Do not scan generator frames more than once
+--FILE--
+<?php
+
+class Canary {
+    public function __construct(public mixed $value) {}
+    public function __destruct() {
+        var_dump(__METHOD__);
+    }
+}
+
+function g() {
+    yield 'foo';
+    Fiber::suspend();
+}
+
+function f($canary) {
+    var_dump(yield from g());
+}
+
+$canary = new Canary(null);
+
+$iterable = f($canary);
+
+$fiber = new Fiber(function () use ($iterable, $canary) {
+    var_dump($canary, $iterable->current());
+    $iterable->next();
+    var_dump("not executed");
+});
+
+$canary->value = $fiber;
+
+$fiber->start();
+
+$iterable->current();
+
+$fiber = $iterable = $canary = null;
+
+gc_collect_cycles();
+
+?>
+==DONE==
+--EXPECTF--
+object(Canary)#%d (1) {
+  ["value"]=>
+  object(Fiber)#%d (0) {
+  }
+}
+string(3) "foo"
+string(18) "Canary::__destruct"
+==DONE==

Zend/tests/gh15330-005.phpt

@@ -0,0 +1,53 @@
+--TEST--
+GH-15330 005: Do not scan generator frames more than once
+--FILE--
+<?php
+
+class Canary {
+    public function __construct(public mixed $value) {}
+    public function __destruct() {
+        var_dump(__METHOD__);
+    }
+}
+
+function g() {
+    yield 'foo';
+    Fiber::suspend();
+}
+
+function f($canary) {
+    var_dump(yield from g());
+}
+
+$canary = new Canary(null);
+
+$iterable = f($canary);
+
+$fiber = new Fiber(function () use ($iterable, $canary) {
+    var_dump($canary, $iterable->current());
+    $f = $iterable->next(...);
+    $f();
+    var_dump("not executed");
+});
+
+$canary->value = $fiber;
+
+$fiber->start();
+
+$iterable->current();
+
+$fiber = $iterable = $canary = null;
+
+gc_collect_cycles();
+
+?>
+==DONE==
+--EXPECTF--
+object(Canary)#%d (1) {
+  ["value"]=>
+  object(Fiber)#%d (0) {
+  }
+}
+string(3) "foo"
+string(18) "Canary::__destruct"
+==DONE==

Zend/tests/gh15330-006.phpt

@@ -0,0 +1,56 @@
+--TEST--
+GH-15330 006: Do not scan generator frames more than once
+--FILE--
+<?php
+
+class Canary {
+    public function __construct(public mixed $value) {}
+    public function __destruct() {
+        var_dump(__METHOD__);
+    }
+}
+
+function h() {
+    yield 'foo';
+    Fiber::suspend();
+}
+
+function g() {
+    yield from h();
+}
+
+function f($canary) {
+    var_dump(yield from g());
+}
+
+$canary = new Canary(null);
+
+$iterable = f($canary);
+
+$fiber = new Fiber(function () use ($iterable, $canary) {
+    var_dump($canary, $iterable->current());
+    $iterable->next();
+    var_dump("not executed");
+});
+
+$canary->value = $fiber;
+
+$fiber->start();
+
+$iterable->current();
+
+$fiber = $iterable = $canary = null;
+
+gc_collect_cycles();
+
+?>
+==DONE==
+--EXPECTF--
+object(Canary)#%d (1) {
+  ["value"]=>
+  object(Fiber)#%d (0) {
+  }
+}
+string(3) "foo"
+string(18) "Canary::__destruct"
+==DONE==

Zend/zend_execute.c

@@ -4753,7 +4753,20 @@ ZEND_API ZEND_ATTRIBUTE_DEPRECATED HashTable *zend_unfinished_execution_gc(zend_
 
 ZEND_API HashTable *zend_unfinished_execution_gc_ex(zend_execute_data *execute_data, zend_execute_data *call, zend_get_gc_buffer *gc_buffer, bool suspended_by_yield)
 {
-	if (!EX(func) || !ZEND_USER_CODE(EX(func)->common.type)) {
+	if (!EX(func)) {
+		return NULL;
+	}
+
+	if (EX_CALL_INFO() & ZEND_CALL_RELEASE_THIS) {
+		zend_get_gc_buffer_add_obj(gc_buffer, Z_OBJ(execute_data->This));
+	}
+
+	if (EX_CALL_INFO() & ZEND_CALL_CLOSURE) {
+		zend_get_gc_buffer_add_obj(gc_buffer, ZEND_CLOSURE_OBJECT(EX(func)));
+	}
+
+	if (!ZEND_USER_CODE(EX(func)->common.type)) {
+		ZEND_ASSERT(!(EX_CALL_INFO() & (ZEND_CALL_HAS_SYMBOL_TABLE|ZEND_CALL_FREE_EXTRA_ARGS|ZEND_CALL_HAS_EXTRA_NAMED_PARAMS)));
 		return NULL;
 	}
 
@@ -4774,12 +4787,6 @@ ZEND_API HashTable *zend_unfinished_execution_gc_ex(zend_execute_data *execute_d
 		}
 	}
 
-	if (EX_CALL_INFO() & ZEND_CALL_RELEASE_THIS) {
-		zend_get_gc_buffer_add_obj(gc_buffer, Z_OBJ(execute_data->This));
-	}
-	if (EX_CALL_INFO() & ZEND_CALL_CLOSURE) {
-		zend_get_gc_buffer_add_obj(gc_buffer, ZEND_CLOSURE_OBJECT(EX(func)));
-	}
 	if (EX_CALL_INFO() & ZEND_CALL_HAS_EXTRA_NAMED_PARAMS) {
 		zval extra_named_params;
 		ZVAL_ARR(&extra_named_params, EX(extra_named_params));

Zend/zend_fibers.c

@@ -19,6 +19,7 @@
 
 #include "zend.h"
 #include "zend_API.h"
+#include "zend_gc.h"
 #include "zend_ini.h"
 #include "zend_variables.h"
 #include "zend_vm.h"
@@ -28,6 +29,7 @@
 #include "zend_mmap.h"
 #include "zend_compile.h"
 #include "zend_closures.h"
+#include "zend_generators.h"
 
 #include "zend_fibers.h"
 #include "zend_fibers_arginfo.h"
@@ -824,7 +826,25 @@ static HashTable *zend_fiber_object_gc(zend_object *object, zval **table, int *n
 	HashTable *lastSymTable = NULL;
 	zend_execute_data *ex = fiber->execute_data;
 	for (; ex; ex = ex->prev_execute_data) {
-		HashTable *symTable = zend_unfinished_execution_gc_ex(ex, ex->func && ZEND_USER_CODE(ex->func->type) ? ex->call : NULL, buf, false);
+		HashTable *symTable;
+		if (ZEND_CALL_INFO(ex) & ZEND_CALL_GENERATOR) {
+			/* The generator object is stored in ex->return_value */
+			zend_generator *generator = (zend_generator*)ex->return_value;
+			/* There are two cases to consider:
+			 * - If the generator is currently running, the Generator's GC
+			 *   handler will ignore it because it is not collectable. However,
+			 *   in this context the generator is suspended in Fiber::suspend()
+			 *   and may be collectable, so we can inspect it.
+			 * - If the generator is not running, the Generator's GC handler
+			 *   will inspect it. In this case we have to skip the frame.
+			 */
+			if (!(generator->flags & ZEND_GENERATOR_CURRENTLY_RUNNING)) {
+				continue;
+			}
+			symTable = zend_generator_frame_gc(buf, generator);
+		} else {
+			symTable = zend_unfinished_execution_gc_ex(ex, ex->func && ZEND_USER_CODE(ex->func->type) ? ex->call : NULL, buf, false);
+		}
 		if (symTable) {
 			if (lastSymTable) {
 				zval *val;

Zend/zend_generators.c

@@ -395,11 +395,38 @@ static void zend_generator_free_storage(zend_object *object) /* {{{ */
 }
 /* }}} */
 
+HashTable *zend_generator_frame_gc(zend_get_gc_buffer *gc_buffer, zend_generator *generator)
+{
+	zend_execute_data *execute_data = generator->execute_data;
+	zend_execute_data *call = NULL;
+
+	zend_get_gc_buffer_add_zval(gc_buffer, &generator->value);
+	zend_get_gc_buffer_add_zval(gc_buffer, &generator->key);
+	zend_get_gc_buffer_add_zval(gc_buffer, &generator->retval);
+	zend_get_gc_buffer_add_zval(gc_buffer, &generator->values);
+
+	if (UNEXPECTED(generator->frozen_call_stack)) {
+		/* The frozen stack is linked in reverse order */
+		call = zend_generator_revert_call_stack(generator->frozen_call_stack);
+	}
+
+	HashTable *ht = zend_unfinished_execution_gc_ex(execute_data, call, gc_buffer, true);
+
+	if (UNEXPECTED(generator->frozen_call_stack)) {
+		zend_generator_revert_call_stack(call);
+	}
+
+	if (generator->node.parent) {
+		zend_get_gc_buffer_add_obj(gc_buffer, &generator->node.parent->std);
+	}
+
+	return ht;
+}
+
 static HashTable *zend_generator_get_gc(zend_object *object, zval **table, int *n) /* {{{ */
 {
 	zend_generator *generator = (zend_generator*)object;
 	zend_execute_data *execute_data = generator->execute_data;
-	zend_execute_data *call = NULL;
 
 	if (!execute_data) {
 		if (UNEXPECTED(generator->func->common.fn_flags & ZEND_ACC_CLOSURE)) {
@@ -428,34 +455,11 @@ static HashTable *zend_generator_get_gc(zend_object *object, zval **table, int *
 		return NULL;
 	}
 
-
 	zend_get_gc_buffer *gc_buffer = zend_get_gc_buffer_create();
-	zend_get_gc_buffer_add_zval(gc_buffer, &generator->value);
-	zend_get_gc_buffer_add_zval(gc_buffer, &generator->key);
-	zend_get_gc_buffer_add_zval(gc_buffer, &generator->retval);
-	zend_get_gc_buffer_add_zval(gc_buffer, &generator->values);
-
-	if (UNEXPECTED(generator->frozen_call_stack)) {
-		/* The frozen stack is linked in reverse order */
-		call = zend_generator_revert_call_stack(generator->frozen_call_stack);
-	}
-
-	zend_unfinished_execution_gc_ex(execute_data, call, gc_buffer, true);
-
-	if (UNEXPECTED(generator->frozen_call_stack)) {
-		zend_generator_revert_call_stack(call);
-	}
-
-	if (generator->node.parent) {
-		zend_get_gc_buffer_add_obj(gc_buffer, &generator->node.parent->std);
-	}
-
+	HashTable *ht = zend_generator_frame_gc(gc_buffer, generator);
 	zend_get_gc_buffer_use(gc_buffer, table, n);
-	if (EX_CALL_INFO() & ZEND_CALL_HAS_SYMBOL_TABLE) {
-		return execute_data->symbol_table;
-	} else {
-		return NULL;
-	}
+
+	return ht;
 }
 /* }}} */
 

Zend/zend_generators.h

@@ -135,6 +135,8 @@ static zend_always_inline zend_generator *zend_generator_get_current(zend_genera
 	return zend_generator_update_current(generator);
 }
 
+HashTable *zend_generator_frame_gc(zend_get_gc_buffer *gc_buffer, zend_generator *generator);
+
 END_EXTERN_C()
 
 #endif