Throw DomException for DOM out-of-memory error conditions

A number of error conditions in DOM can only occur if libxml2 runs
out of memory, at least as far as I can see. In such cases we
currently do a silent "return false", which violates the DOM spec,
and which code is very unlikely to handle sensibly.

Switch these to throw a DomException with INVALID_STATE_ERR type.
This error type is chosen because we use for similar checks
elsewhere, for example:
https://github.com/php/php-src/blob/a733b1ada7895f6fa5e349755a878cae9189e3f5/ext/dom/documentfragment.c#L45-L48

This changes some of the more obvious cases I spotted, but there are probably more.

Closes GH-7049.

Author: nikic

ext/dom/document.c

@@ -533,7 +533,8 @@ PHP_METHOD(DOMDocument, createElement)
 
 	node = xmlNewDocNode(docp, NULL, (xmlChar *) name, (xmlChar *) value);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ(node, &ret, intern);
@@ -558,9 +559,10 @@ PHP_METHOD(DOMDocument, createDocumentFragment)
 
 	DOM_GET_OBJ(docp, id, xmlDocPtr, intern);
 
-	node =  xmlNewDocFragment(docp);
+	node = xmlNewDocFragment(docp);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ(node, &ret, intern);
@@ -589,7 +591,8 @@ PHP_METHOD(DOMDocument, createTextNode)
 
 	node = xmlNewDocText(docp, (xmlChar *) value);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ(node, &ret, intern);
@@ -618,7 +621,8 @@ PHP_METHOD(DOMDocument, createComment)
 
 	node = xmlNewDocComment(docp, (xmlChar *) value);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ(node, &ret, intern);
@@ -647,7 +651,8 @@ PHP_METHOD(DOMDocument, createCDATASection)
 
 	node = xmlNewCDataBlock(docp, (xmlChar *) value, value_len);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ(node, &ret, intern);
@@ -681,7 +686,8 @@ PHP_METHOD(DOMDocument, createProcessingInstruction)
 
 	node = xmlNewPI((xmlChar *) name, (xmlChar *) value);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	node->doc = docp;
@@ -717,7 +723,8 @@ PHP_METHOD(DOMDocument, createAttribute)
 
 	node = xmlNewDocProp(docp, (xmlChar *) name, NULL);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ((xmlNodePtr) node, &ret, intern);
@@ -752,7 +759,8 @@ PHP_METHOD(DOMDocument, createEntityReference)
 
 	node = xmlNewReference(docp, (xmlChar *) name);
 	if (!node) {
-		RETURN_FALSE;
+		php_dom_throw_error(INVALID_STATE_ERR, /* strict */ true);
+		RETURN_THROWS();
 	}
 
 	DOM_RET_OBJ((xmlNodePtr) node, &ret, intern);

ext/dom/php_dom.stub.php

@@ -467,10 +467,10 @@ public function createAttributeNS(?string $namespace, string $qualifiedName) {}
     /** @return DOMCdataSection|false */
     public function createCDATASection(string $data) {}
 
-    /** @return DOMComment|false */
+    /** @return DOMComment */
     public function createComment(string $data) {}
 
-    /** @return DOMDocumentFragment|false */
+    /** @return DOMDocumentFragment */
     public function createDocumentFragment() {}
 
     /** @return DOMElement|false */
@@ -485,7 +485,7 @@ public function createEntityReference(string $name) {}
     /** @return DOMProcessingInstruction|false */
     public function createProcessingInstruction(string $target, string $data = "") {}
 
-    /** @return DOMText|false */
+    /** @return DOMText */
     public function createTextNode(string $data) {}
 
     /** @return DOMElement|null */

ext/dom/php_dom_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: d67979083e0adf438b47b3c7296341a4b860fc88 */
+ * Stub hash: aa455c75920e15b5f66964cb560e853d6bc423d2 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(arginfo_dom_import_simplexml, 0, 1, DOMElement, 1)
 	ZEND_ARG_TYPE_INFO(0, node, IS_OBJECT, 0)