author | rbackman |
Tue, 05 May 2015 16:50:25 +0200 | |
changeset 30590 | 14f7f48c1377 |
parent 10517 | hotspot/agent/src/share/classes/sun/jvm/hotspot/compiler/OopMapSet.java@f92c9ff3a15f |
child 30774 | 6745424a720f |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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package sun.jvm.hotspot.compiler; |
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import java.util.*; |
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import sun.jvm.hotspot.code.*; |
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import sun.jvm.hotspot.debugger.*; |
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import sun.jvm.hotspot.runtime.*; |
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import sun.jvm.hotspot.types.*; |
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import sun.jvm.hotspot.utilities.*; |
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public class ImmutableOopMapSet extends VMObject { |
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private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.compiler.ImmutableOopMapSet.DEBUG") != null; |
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private static CIntegerField countField; |
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private static CIntegerField sizeField; |
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private static AddressField omDataField; |
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private static int REG_COUNT; |
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private static int SAVED_ON_ENTRY_REG_COUNT; |
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private static int C_SAVED_ON_ENTRY_REG_COUNT; |
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private static long classSize; |
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private static class MyVisitor implements OopMapVisitor { |
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private AddressVisitor addressVisitor; |
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public MyVisitor(AddressVisitor oopVisitor) { |
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setAddressVisitor(oopVisitor); |
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} |
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public void setAddressVisitor(AddressVisitor addressVisitor) { |
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this.addressVisitor = addressVisitor; |
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} |
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public void visitOopLocation(Address oopAddr) { |
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addressVisitor.visitAddress(oopAddr); |
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} |
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public void visitDerivedOopLocation(Address baseOopAddr, Address derivedOopAddr) { |
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if (VM.getVM().isClientCompiler()) { |
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Assert.that(false, "should not reach here"); |
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} else if (VM.getVM().isServerCompiler() && |
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VM.getVM().useDerivedPointerTable()) { |
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Assert.that(false, "FIXME: add derived pointer table"); |
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} |
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} |
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public void visitValueLocation(Address valueAddr) { |
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} |
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public void visitNarrowOopLocation(Address narrowOopAddr) { |
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addressVisitor.visitCompOopAddress(narrowOopAddr); |
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} |
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} |
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static { |
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VM.registerVMInitializedObserver(new Observer() { |
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public void update(Observable o, Object data) { |
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initialize(VM.getVM().getTypeDataBase()); |
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} |
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}); |
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} |
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private static void initialize(TypeDataBase db) { |
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Type type = db.lookupType("ImmutableOopMapSet"); |
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countField = type.getCIntegerField("_count"); |
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sizeField = type.getCIntegerField("_size"); |
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classSize = type.getSize(); |
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if (!VM.getVM().isCore()) { |
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REG_COUNT = db.lookupIntConstant("REG_COUNT").intValue(); |
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if (VM.getVM().isServerCompiler()) { |
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SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("SAVED_ON_ENTRY_REG_COUNT").intValue(); |
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C_SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("C_SAVED_ON_ENTRY_REG_COUNT").intValue(); |
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} |
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} |
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} |
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public ImmutableOopMapSet(Address addr) { |
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super(addr); |
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} |
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/** |
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* Returns the number of OopMaps in this ImmutableOopMapSet |
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*/ |
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public long getSize() { |
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return countField.getValue(addr); |
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} |
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public int getCount() { return (int) countField.getValue(addr); } |
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private Address dataStart() { |
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return (addr.addOffsetTo(ImmutableOopMapSet.classSize * getCount())); |
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} |
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public ImmutableOopMapPair pairAt(int index) { |
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Assert.that((index >= 0) && (index < getCount()), "bad index"); |
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return new ImmutableOopMapPair(addr.addOffsetTo(index * ImmutableOopMapPair.classSize())); |
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} |
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/** |
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* returns the OopMap at a given index |
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*/ |
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public ImmutableOopMap getMapAt(int index) { |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that((index >= 0) && (index <= getSize()), "bad index"); |
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} |
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ImmutableOopMapPair immutableOopMapPair = pairAt(index); |
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return getMap(immutableOopMapPair); |
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} |
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public ImmutableOopMap findMapAtOffset(long pcOffset, boolean debugging) { |
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int i; |
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int len = (int) getSize(); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(len > 0, "must have pointer maps"); |
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} |
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// Scan through oopmaps. Stop when current offset is either equal or greater |
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// than the one we are looking for. |
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for (i = 0; i < len; i++) { |
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if (pairAt(i).getPC() >= pcOffset) { |
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break; |
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} |
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} |
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if (!debugging) { |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(i < len, "oopmap not found for pcOffset = " + pcOffset + "; len = " + len); |
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Assert.that(pairAt(i).getPC() == pcOffset, "oopmap not found"); |
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} |
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} else { |
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if (i == len) { |
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if (DEBUG) { |
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System.out.println("can't find oopmap at " + pcOffset); |
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System.out.print("Oopmap offsets are [ "); |
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for (i = 0; i < len; i++) { |
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System.out.print(pairAt(i).getPC()); |
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} |
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System.out.println("]"); |
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} |
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i = len - 1; |
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return getMapAt(i); |
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} |
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} |
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ImmutableOopMap m = getMapAt(i); |
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return m; |
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} |
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/** |
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* Visitation -- iterates through the frame for a compiled method. |
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* This is a very generic mechanism that requires the Address to be |
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* dereferenced by the callee. Other, more specialized, visitation |
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* mechanisms are given below. |
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*/ |
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public static void oopsDo(Frame fr, CodeBlob cb, RegisterMap regMap, AddressVisitor oopVisitor, boolean debugging) { |
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allDo(fr, cb, regMap, new MyVisitor(oopVisitor), debugging); |
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} |
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/** |
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* Note that there are 4 required AddressVisitors: one for oops, |
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* one for derived oops, one for values, and one for dead values |
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*/ |
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public static void allDo(Frame fr, CodeBlob cb, RegisterMap regMap, OopMapVisitor visitor, boolean debugging) { |
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if (Assert.ASSERTS_ENABLED) { |
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CodeBlob tmpCB = VM.getVM().getCodeCache().findBlob(fr.getPC()); |
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Assert.that(tmpCB != null && cb.equals(tmpCB), "wrong codeblob passed in"); |
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} |
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ImmutableOopMapSet maps = cb.getOopMaps(); |
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ImmutableOopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(map != null, "no ptr map found"); |
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} |
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// handle derived pointers first (otherwise base pointer may be |
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// changed before derived pointer offset has been collected) |
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OopMapValue omv; |
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{ |
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for (OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.DERIVED_OOP_VALUE); !oms.isDone(); oms.next()) { |
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if (VM.getVM().isClientCompiler()) { |
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Assert.that(false, "should not reach here"); |
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} |
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omv = oms.getCurrent(); |
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Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap); |
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if (loc != null) { |
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Address baseLoc = fr.oopMapRegToLocation(omv.getContentReg(), regMap); |
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Address derivedLoc = loc; |
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visitor.visitDerivedOopLocation(baseLoc, derivedLoc); |
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} |
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} |
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} |
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// We want narow oop, value and oop oop_types |
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OopMapValue.OopTypes[] values = new OopMapValue.OopTypes[]{ |
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OopMapValue.OopTypes.OOP_VALUE, OopMapValue.OopTypes.VALUE_VALUE, OopMapValue.OopTypes.NARROWOOP_VALUE |
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}; |
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{ |
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for (OopMapStream oms = new OopMapStream(map, values); !oms.isDone(); oms.next()) { |
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omv = oms.getCurrent(); |
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Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap); |
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if (loc != null) { |
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if (omv.getType() == OopMapValue.OopTypes.OOP_VALUE) { |
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// This assert commented out because this will be useful |
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// to detect in the debugging system |
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// assert(Universe::is_heap_or_null(*loc), "found non oop pointer"); |
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visitor.visitOopLocation(loc); |
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} else if (omv.getType() == OopMapValue.OopTypes.VALUE_VALUE) { |
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visitor.visitValueLocation(loc); |
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} else if (omv.getType() == OopMapValue.OopTypes.NARROWOOP_VALUE) { |
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visitor.visitNarrowOopLocation(loc); |
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} |
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} |
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} |
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} |
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} |
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/** |
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* Update callee-saved register info for the following frame. |
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* Should only be called in non-core builds. |
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*/ |
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public static void updateRegisterMap(Frame fr, CodeBlob cb, RegisterMap regMap, boolean debugging) { |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(!VM.getVM().isCore(), "non-core builds only"); |
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} |
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if (!VM.getVM().isDebugging()) { |
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if (Assert.ASSERTS_ENABLED) { |
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ImmutableOopMapSet maps = cb.getOopMaps(); |
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Assert.that((maps != null) && (maps.getSize() > 0), "found null or empty ImmutableOopMapSet for CodeBlob"); |
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} |
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} else { |
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// Hack for some topmost frames that have been found with empty |
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// OopMapSets. (Actually have not seen the null case, but don't |
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// want to take any chances.) See HSDB.showThreadStackMemory(). |
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ImmutableOopMapSet maps = cb.getOopMaps(); |
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if ((maps == null) || (maps.getSize() == 0)) { |
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return; |
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} |
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} |
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// Check if caller must update oop argument |
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regMap.setIncludeArgumentOops(cb.callerMustGCArguments()); |
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int nofCallee = 0; |
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Address[] locs = new Address[2 * REG_COUNT + 1]; |
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VMReg[] regs = new VMReg[2 * REG_COUNT + 1]; |
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// ("+1" because REG_COUNT might be zero) |
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// Scan through oopmap and find location of all callee-saved registers |
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// (we do not do update in place, since info could be overwritten) |
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ImmutableOopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(map != null, "no ptr map found"); |
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} |
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OopMapValue omv = null; |
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for (OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.CALLEE_SAVED_VALUE); !oms.isDone(); oms.next()) { |
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omv = oms.getCurrent(); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(nofCallee < 2 * REG_COUNT, "overflow"); |
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} |
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regs[nofCallee] = omv.getContentReg(); |
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locs[nofCallee] = fr.oopMapRegToLocation(omv.getReg(), regMap); |
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nofCallee++; |
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} |
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// Check that runtime stubs save all callee-saved registers |
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// After adapter frames were deleted C2 doesn't use callee save registers at present |
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if (Assert.ASSERTS_ENABLED) { |
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if (VM.getVM().isServerCompiler()) { |
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Assert.that(!cb.isRuntimeStub() || |
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(nofCallee >= SAVED_ON_ENTRY_REG_COUNT || nofCallee >= C_SAVED_ON_ENTRY_REG_COUNT), |
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"must save all"); |
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} |
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} |
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// Copy found callee-saved register to reg_map |
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for (int i = 0; i < nofCallee; i++) { |
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regMap.setLocation(regs[i], locs[i]); |
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} |
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} |
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public ImmutableOopMapPair getPairAt(int index) { |
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return pairAt(index); |
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} |
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public ImmutableOopMap getMap(ImmutableOopMapPair pair) { |
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Assert.that(pair.getOffset() < (int) sizeField.getValue(), "boundary check"); |
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return new ImmutableOopMap(dataStart().addOffsetTo(pair.getOffset())); |
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} |
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} |