| /* |
| * Copyright (c) 2000, 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. |
| * |
| */ |
| |
| package sun.jvm.hotspot.code; |
| |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.memory.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| public class CodeCache { |
| private static AddressField heapField; |
| private static AddressField scavengeRootNMethodsField; |
| private static VirtualConstructor virtualConstructor; |
| |
| private CodeHeap heap; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) { |
| Type type = db.lookupType("CodeCache"); |
| |
| heapField = type.getAddressField("_heap"); |
| scavengeRootNMethodsField = type.getAddressField("_scavenge_root_nmethods"); |
| |
| virtualConstructor = new VirtualConstructor(db); |
| // Add mappings for all possible CodeBlob subclasses |
| virtualConstructor.addMapping("BufferBlob", BufferBlob.class); |
| virtualConstructor.addMapping("nmethod", NMethod.class); |
| virtualConstructor.addMapping("RuntimeStub", RuntimeStub.class); |
| virtualConstructor.addMapping("AdapterBlob", AdapterBlob.class); |
| virtualConstructor.addMapping("MethodHandlesAdapterBlob", MethodHandlesAdapterBlob.class); |
| virtualConstructor.addMapping("SafepointBlob", SafepointBlob.class); |
| virtualConstructor.addMapping("DeoptimizationBlob", DeoptimizationBlob.class); |
| if (VM.getVM().isServerCompiler()) { |
| virtualConstructor.addMapping("ExceptionBlob", ExceptionBlob.class); |
| virtualConstructor.addMapping("UncommonTrapBlob", UncommonTrapBlob.class); |
| } |
| } |
| |
| public CodeCache() { |
| heap = (CodeHeap) VMObjectFactory.newObject(CodeHeap.class, heapField.getValue()); |
| } |
| |
| public NMethod scavengeRootMethods() { |
| return (NMethod) VMObjectFactory.newObject(NMethod.class, scavengeRootNMethodsField.getValue()); |
| } |
| |
| public boolean contains(Address p) { |
| return getHeap().contains(p); |
| } |
| |
| /** When VM.getVM().isDebugging() returns true, this behaves like |
| findBlobUnsafe */ |
| public CodeBlob findBlob(Address start) { |
| CodeBlob result = findBlobUnsafe(start); |
| if (result == null) return null; |
| if (VM.getVM().isDebugging()) { |
| return result; |
| } |
| // We could potientially look up non_entrant methods |
| // NOTE: this is effectively a "guarantee", and is slightly different from the one in the VM |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(!(result.isZombie() || result.isLockedByVM()), "unsafe access to zombie method"); |
| } |
| return result; |
| } |
| |
| public CodeBlob findBlobUnsafe(Address start) { |
| CodeBlob result = null; |
| |
| try { |
| result = (CodeBlob) virtualConstructor.instantiateWrapperFor(getHeap().findStart(start)); |
| } |
| catch (WrongTypeException wte) { |
| Address cbAddr = null; |
| try { |
| cbAddr = getHeap().findStart(start); |
| } |
| catch (Exception findEx) { |
| findEx.printStackTrace(); |
| } |
| |
| String message = "Couldn't deduce type of CodeBlob "; |
| if (cbAddr != null) { |
| message = message + "@" + cbAddr + " "; |
| } |
| message = message + "for PC=" + start; |
| |
| throw new RuntimeException(message, wte); |
| } |
| if (result == null) return null; |
| if (Assert.ASSERTS_ENABLED) { |
| // The HeapBlock that contains this blob is outside of the blob |
| // but it shouldn't be an error to find a blob based on the |
| // pointer to the HeapBlock. |
| Assert.that(result.blobContains(start) || result.blobContains(start.addOffsetTo(8)), |
| "found wrong CodeBlob"); |
| } |
| return result; |
| } |
| |
| public NMethod findNMethod(Address start) { |
| CodeBlob cb = findBlob(start); |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod"); |
| } |
| return (NMethod) cb; |
| } |
| |
| public NMethod findNMethodUnsafe(Address start) { |
| CodeBlob cb = findBlobUnsafe(start); |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod"); |
| } |
| return (NMethod) cb; |
| } |
| |
| /** Routine for instantiating appropriately-typed wrapper for a |
| CodeBlob. Used by CodeCache, Runtime1, etc. */ |
| public CodeBlob createCodeBlobWrapper(Address codeBlobAddr) { |
| try { |
| return (CodeBlob) virtualConstructor.instantiateWrapperFor(codeBlobAddr); |
| } |
| catch (Exception e) { |
| String message = "Unable to deduce type of CodeBlob from address " + codeBlobAddr + |
| " (expected type nmethod, RuntimeStub, "; |
| if (VM.getVM().isClientCompiler()) { |
| message = message + " or "; |
| } |
| message = message + "SafepointBlob"; |
| if (VM.getVM().isServerCompiler()) { |
| message = message + ", DeoptimizationBlob, or ExceptionBlob"; |
| } |
| message = message + ")"; |
| throw new RuntimeException(message); |
| } |
| } |
| |
| public void iterate(CodeCacheVisitor visitor) { |
| CodeHeap heap = getHeap(); |
| Address ptr = heap.begin(); |
| Address end = heap.end(); |
| |
| visitor.prologue(ptr, end); |
| CodeBlob lastBlob = null; |
| while (ptr != null && ptr.lessThan(end)) { |
| try { |
| // Use findStart to get a pointer inside blob other findBlob asserts |
| CodeBlob blob = findBlobUnsafe(heap.findStart(ptr)); |
| if (blob != null) { |
| visitor.visit(blob); |
| if (blob == lastBlob) { |
| throw new InternalError("saw same blob twice"); |
| } |
| lastBlob = blob; |
| } |
| } catch (RuntimeException e) { |
| e.printStackTrace(); |
| } |
| Address next = heap.nextBlock(ptr); |
| if (next != null && next.lessThan(ptr)) { |
| throw new InternalError("pointer moved backwards"); |
| } |
| ptr = next; |
| } |
| visitor.epilogue(); |
| } |
| |
| //-------------------------------------------------------------------------------- |
| // Internals only below this point |
| // |
| |
| private CodeHeap getHeap() { |
| return heap; |
| } |
| } |