8247536: Support for pre-generated java.lang.invoke classes in CDS static archive

Reviewed-by: iklam, mchung

src/hotspot/share/classfile/lambdaFormInvokers.cpp

@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/classLoadInfo.hpp"
+#include "classfile/classFileStream.hpp"
+#include "classfile/dictionary.hpp"
+#include "classfile/javaClasses.inline.hpp"
+#include "classfile/klassFactory.hpp"
+#include "classfile/lambdaFormInvokers.hpp"
+#include "classfile/symbolTable.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/systemDictionaryShared.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "logging/log.hpp"
+#include "memory/oopFactory.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/klass.hpp"
+#include "oops/objArrayKlass.hpp"
+#include "oops/objArrayOop.hpp"
+#include "oops/oop.inline.hpp"
+#include "oops/typeArrayOop.inline.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/javaCalls.hpp"
+
+GrowableArray<char*>* LambdaFormInvokers::_lambdaform_lines = NULL;
+
+void LambdaFormInvokers::append(char* line) {
+  if (_lambdaform_lines == NULL) {
+    _lambdaform_lines = new GrowableArray<char*>(100);
+  }
+  _lambdaform_lines->append(line);
+}
+
+void LambdaFormInvokers::regenerate_holder_classes(TRAPS) {
+  assert(_lambdaform_lines != NULL, "Bad List");
+  ResourceMark rm(THREAD);
+
+  Symbol* cds_name  = vmSymbols::jdk_internal_misc_CDS();
+  Klass*  cds_klass = SystemDictionary::resolve_or_null(cds_name, THREAD);
+  guarantee(cds_klass != NULL, "jdk/internal/misc/CDS must exist!");
+
+  int len = _lambdaform_lines->length();
+  objArrayHandle list_lines = oopFactory::new_objArray_handle(SystemDictionary::String_klass(), len, CHECK);
+  for (int i = 0; i < len; i++) {
+    char* record = _lambdaform_lines->at(i);
+    record += strlen(lambda_form_invoker_tag()) + 1; // skip the @lambda_form_invoker prefix
+    Handle h_line = java_lang_String::create_from_str(record, CHECK);
+    list_lines->obj_at_put(i, h_line());
+  }
+
+  //
+  // Object[] CDS.generateLambdaFormHolderClasses(String[] lines)
+  // the returned Object[] layout:
+  //   name, byte[], name, byte[] ....
+  Symbol* method = vmSymbols::generateLambdaFormHolderClasses();
+  Symbol* signrs = vmSymbols::generateLambdaFormHolderClasses_signature();
+
+  JavaValue result(T_OBJECT);
+  JavaCalls::call_static(&result, cds_klass, method, signrs, list_lines, THREAD);
+
+  if (HAS_PENDING_EXCEPTION) {
+    log_info(cds)("%s: %s", THREAD->pending_exception()->klass()->external_name(),
+                            java_lang_String::as_utf8_string(java_lang_Throwable::message(THREAD->pending_exception())));
+    CLEAR_PENDING_EXCEPTION;
+    return;
+  }
+
+  objArrayHandle h_array(THREAD, (objArrayOop)result.get_jobject());
+  int sz = h_array->length();
+  assert(sz % 2 == 0 && sz >= 2, "Must be even size of length");
+  for (int i = 0; i < sz; i+= 2) {
+    Handle h_name(THREAD, h_array->obj_at(i));
+    typeArrayHandle h_bytes(THREAD, (typeArrayOop)h_array->obj_at(i+1));
+    assert(h_name != NULL, "Class name is NULL");
+    assert(h_bytes != NULL, "Class bytes is NULL");
+
+    char *class_name = java_lang_String::as_utf8_string(h_name());
+    int len = h_bytes->length();
+    // make a copy of class bytes so GC will not affect us.
+    char *buf = resource_allocate_bytes(THREAD, len);
+    memcpy(buf, (char*)h_bytes->byte_at_addr(0), len);
+    ClassFileStream st((u1*)buf, len, NULL, ClassFileStream::verify);
+
+    reload_class(class_name, st, THREAD);
+    // free buf
+    resource_free_bytes(buf, len);
+
+    if (HAS_PENDING_EXCEPTION) {
+      log_info(cds)("Exception happened: %s", PENDING_EXCEPTION->klass()->name()->as_C_string());
+      log_info(cds)("Could not create InstanceKlass for class %s", class_name);
+      CLEAR_PENDING_EXCEPTION;
+      return;
+    }
+  }
+}
+
+// class_handle - the class name, bytes_handle - the class bytes
+void LambdaFormInvokers::reload_class(char* name, ClassFileStream& st, TRAPS) {
+  Symbol* class_name = SymbolTable::new_symbol((const char*)name);
+  // the class must exist
+  Klass* klass = SystemDictionary::resolve_or_null(class_name, THREAD);
+  if (klass == NULL) {
+    log_info(cds)("Class %s not present, skip", name);
+    return;
+  }
+  assert(klass->is_instance_klass(), "Should be");
+
+  ClassLoaderData* cld = ClassLoaderData::the_null_class_loader_data();
+  Handle protection_domain;
+  ClassLoadInfo cl_info(protection_domain);
+
+  InstanceKlass* result = KlassFactory::create_from_stream(&st,
+                                                   class_name,
+                                                   cld,
+                                                   cl_info,
+                                                   CHECK);
+
+  {
+    MutexLocker mu_r(THREAD, Compile_lock); // add_to_hierarchy asserts this.
+    SystemDictionary::add_to_hierarchy(result, THREAD);
+  }
+  // new class not linked yet.
+  MetaspaceShared::try_link_class(result, THREAD);
+  assert(!HAS_PENDING_EXCEPTION, "Invariant");
+
+  // exclude the existing class from dump
+  SystemDictionaryShared::set_excluded(InstanceKlass::cast(klass));
+  log_info(cds)("Replaced class %s, old: %p  new: %p", name, klass, result);
+}