Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/code/CodeCache.java @ 7353:b5280041f59e
Experiment with soft alignment for branch targets.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 13 Jan 2013 19:32:16 +0100 |
parents | b9a9ed0f8eeb |
children |
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/* * 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; } }