Mercurial > hg > truffle
view src/share/vm/runtime/dtraceJSDT.cpp @ 7432:0b3d19153cc6
8001028: Improve GC option handling
Summary: If there are not enough native resources to create the ReferenceHandler or Finalizer Java threads, the VM will attempt to throw an OOME before the java.lang.Class class has been initialized. This can result in assertion failures and other crashes. Move the initialization of the java.lang.Class class to just before the initialization of the java.lang.ref.Finalizer class.
Reviewed-by: jwilhelm, dholmes, coleenp
author | johnc |
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date | Wed, 12 Dec 2012 12:07:32 -0800 |
parents | da91efe96a93 |
children |
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/* * Copyright (c) 1997, 2012, 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/javaClasses.hpp" #include "code/codeBlob.hpp" #include "memory/allocation.hpp" #include "prims/jvm.h" #include "runtime/dtraceJSDT.hpp" #include "runtime/jniHandles.hpp" #include "runtime/os.hpp" #include "utilities/exceptions.hpp" #include "utilities/globalDefinitions.hpp" #include "utilities/utf8.hpp" #ifdef HAVE_DTRACE_H jlong DTraceJSDT::activate( jint version, jstring module_name, jint providers_count, JVM_DTraceProvider* providers, TRAPS) { size_t count = 0; RegisteredProbes* probes = NULL; if (!is_supported()) { return 0; } assert(module_name != NULL, "valid module name"); assert(providers != NULL, "valid provider array"); for (int i = 0; i < providers_count; ++i) { count += providers[i].probe_count; } probes = new RegisteredProbes(count); count = 0; for (int i = 0; i < providers_count; ++i) { assert(providers[i].name != NULL, "valid provider name"); assert(providers[i].probe_count == 0 || providers[i].probes != NULL, "valid probe count"); for (int j = 0; j < providers[i].probe_count; ++j) { JVM_DTraceProbe* probe = &(providers[i].probes[j]); assert(probe != NULL, "valid probe"); assert(probe->method != NULL, "valid method"); assert(probe->name != NULL, "valid probe name"); assert(probe->function != NULL, "valid probe function spec"); methodHandle h_method = methodHandle(THREAD, Method::resolve_jmethod_id(probe->method)); nmethod* nm = AdapterHandlerLibrary::create_dtrace_nmethod(h_method); if (nm == NULL) { delete probes; THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to register DTrace probes (CodeCache: no room for DTrace nmethods)."); } h_method()->set_not_compilable(); h_method()->set_code(h_method, nm); probes->nmethod_at_put(count++, nm); } } int handle = pd_activate((void*)probes, module_name, providers_count, providers); if (handle < 0) { delete probes; THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to register DTrace probes (internal error)."); } probes->set_helper_handle(handle); return RegisteredProbes::toOpaqueProbes(probes); } jboolean DTraceJSDT::is_probe_enabled(jmethodID method) { Method* m = Method::resolve_jmethod_id(method); return nativeInstruction_at(m->code()->trap_address())->is_dtrace_trap(); } void DTraceJSDT::dispose(OpaqueProbes probes) { RegisteredProbes* p = RegisteredProbes::toRegisteredProbes(probes); if (probes != -1 && p != NULL) { pd_dispose(p->helper_handle()); delete p; } } jboolean DTraceJSDT::is_supported() { return pd_is_supported(); } #else // HAVE_DTRACE_H jlong DTraceJSDT::activate( jint version, jstring module_name, jint providers_count, JVM_DTraceProvider* providers, TRAPS) { return 0; } jboolean DTraceJSDT::is_probe_enabled(jmethodID method) { return false; } void DTraceJSDT::dispose(OpaqueProbes probes) { return; } jboolean DTraceJSDT::is_supported() { return false; } #endif // ndef HAVE_DTRACE_H