--- old/agent/src/share/classes/sun/jvm/hotspot/compiler/OopMapSet.java 2015-04-28 11:53:34.883076432 +0200 +++ /dev/null 2015-03-20 09:32:23.917785769 +0100 @@ -1,289 +0,0 @@ -/* - * Copyright (c) 2000, 2008, 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.compiler; - -import java.util.*; - -import sun.jvm.hotspot.code.*; -import sun.jvm.hotspot.debugger.*; -import sun.jvm.hotspot.runtime.*; -import sun.jvm.hotspot.types.*; -import sun.jvm.hotspot.utilities.*; - -public class OopMapSet extends VMObject { - private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.compiler.OopMapSet.DEBUG") != null; - - private static CIntegerField omCountField; - private static CIntegerField omSizeField; - private static AddressField omDataField; - private static int REG_COUNT; - private static int SAVED_ON_ENTRY_REG_COUNT; - private static int C_SAVED_ON_ENTRY_REG_COUNT; - private static class MyVisitor implements OopMapVisitor { - private AddressVisitor addressVisitor; - - public MyVisitor(AddressVisitor oopVisitor) { - setAddressVisitor(oopVisitor); - } - - public void setAddressVisitor(AddressVisitor addressVisitor) { - this.addressVisitor = addressVisitor; - } - - public void visitOopLocation(Address oopAddr) { - addressVisitor.visitAddress(oopAddr); - } - - public void visitDerivedOopLocation(Address baseOopAddr, Address derivedOopAddr) { - if (VM.getVM().isClientCompiler()) { - Assert.that(false, "should not reach here"); - } else if (VM.getVM().isServerCompiler() && - VM.getVM().useDerivedPointerTable()) { - Assert.that(false, "FIXME: add derived pointer table"); - } - } - - public void visitValueLocation(Address valueAddr) { - } - - public void visitNarrowOopLocation(Address narrowOopAddr) { - addressVisitor.visitCompOopAddress(narrowOopAddr); - } - } - - static { - VM.registerVMInitializedObserver(new Observer() { - public void update(Observable o, Object data) { - initialize(VM.getVM().getTypeDataBase()); - } - }); - } - - private static void initialize(TypeDataBase db) { - Type type = db.lookupType("OopMapSet"); - - omCountField = type.getCIntegerField("_om_count"); - omSizeField = type.getCIntegerField("_om_size"); - omDataField = type.getAddressField("_om_data"); - - if (!VM.getVM().isCore()) { - REG_COUNT = db.lookupIntConstant("REG_COUNT").intValue(); - if (VM.getVM().isServerCompiler()) { - SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("SAVED_ON_ENTRY_REG_COUNT").intValue(); - C_SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("C_SAVED_ON_ENTRY_REG_COUNT").intValue(); - } - } - } - - public OopMapSet(Address addr) { - super(addr); - } - - /** Returns the number of OopMaps in this OopMapSet */ - public long getSize() { - return omCountField.getValue(addr); - } - - /** returns the OopMap at a given index */ - public OopMap getMapAt(int index) { - if (Assert.ASSERTS_ENABLED) { - Assert.that((index >= 0) && (index <= getSize()),"bad index"); - } - Address omDataAddr = omDataField.getValue(addr); - Address oopMapAddr = omDataAddr.getAddressAt(index * VM.getVM().getAddressSize()); - if (oopMapAddr == null) { - return null; - } - return new OopMap(oopMapAddr); - } - - public OopMap findMapAtOffset(long pcOffset, boolean debugging) { - int i; - int len = (int) getSize(); - if (Assert.ASSERTS_ENABLED) { - Assert.that(len > 0, "must have pointer maps"); - } - - // Scan through oopmaps. Stop when current offset is either equal or greater - // than the one we are looking for. - for (i = 0; i < len; i++) { - if (getMapAt(i).getOffset() >= pcOffset) { - break; - } - } - - if (!debugging) { - if (Assert.ASSERTS_ENABLED) { - Assert.that(i < len, "oopmap not found for pcOffset = " + pcOffset + "; len = " + len); - Assert.that(getMapAt(i).getOffset() == pcOffset, "oopmap not found"); - } - } else { - if (i == len) { - if (DEBUG) { - System.out.println("can't find oopmap at " + pcOffset); - System.out.print("Oopmap offsets are [ "); - for (i = 0; i < len; i++) { - System.out.print(getMapAt(i).getOffset()); - } - System.out.println("]"); - } - i = len - 1; - return getMapAt(i); - } - } - - OopMap m = getMapAt(i); - return m; - } - - /** Visitation -- iterates through the frame for a compiled method. - This is a very generic mechanism that requires the Address to be - dereferenced by the callee. Other, more specialized, visitation - mechanisms are given below. */ - public static void oopsDo(Frame fr, CodeBlob cb, RegisterMap regMap, AddressVisitor oopVisitor, boolean debugging) { - allDo(fr, cb, regMap, new MyVisitor(oopVisitor), debugging); - } - - /** Note that there are 4 required AddressVisitors: one for oops, - one for derived oops, one for values, and one for dead values */ - public static void allDo(Frame fr, CodeBlob cb, RegisterMap regMap, OopMapVisitor visitor, boolean debugging) { - if (Assert.ASSERTS_ENABLED) { - CodeBlob tmpCB = VM.getVM().getCodeCache().findBlob(fr.getPC()); - Assert.that(tmpCB != null && cb.equals(tmpCB), "wrong codeblob passed in"); - } - - OopMapSet maps = cb.getOopMaps(); - OopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging); - if (Assert.ASSERTS_ENABLED) { - Assert.that(map != null, "no ptr map found"); - } - - // handle derived pointers first (otherwise base pointer may be - // changed before derived pointer offset has been collected) - OopMapValue omv; - { - for (OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.DERIVED_OOP_VALUE); !oms.isDone(); oms.next()) { - if (VM.getVM().isClientCompiler()) { - Assert.that(false, "should not reach here"); - } - omv = oms.getCurrent(); - Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap); - if (loc != null) { - Address baseLoc = fr.oopMapRegToLocation(omv.getContentReg(), regMap); - Address derivedLoc = loc; - visitor.visitDerivedOopLocation(baseLoc, derivedLoc); - } - } - } - - // We want narow oop, value and oop oop_types - OopMapValue.OopTypes[] values = new OopMapValue.OopTypes[] { - OopMapValue.OopTypes.OOP_VALUE, OopMapValue.OopTypes.VALUE_VALUE, OopMapValue.OopTypes.NARROWOOP_VALUE - }; - - { - for (OopMapStream oms = new OopMapStream(map, values); !oms.isDone(); oms.next()) { - omv = oms.getCurrent(); - Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap); - if (loc != null) { - if (omv.getType() == OopMapValue.OopTypes.OOP_VALUE) { - // This assert commented out because this will be useful - // to detect in the debugging system - // assert(Universe::is_heap_or_null(*loc), "found non oop pointer"); - visitor.visitOopLocation(loc); - } else if (omv.getType() == OopMapValue.OopTypes.VALUE_VALUE) { - visitor.visitValueLocation(loc); - } else if (omv.getType() == OopMapValue.OopTypes.NARROWOOP_VALUE) { - visitor.visitNarrowOopLocation(loc); - } - } - } - } - } - - /** Update callee-saved register info for the following frame. - Should only be called in non-core builds. */ - public static void updateRegisterMap(Frame fr, CodeBlob cb, RegisterMap regMap, boolean debugging) { - if (Assert.ASSERTS_ENABLED) { - Assert.that(!VM.getVM().isCore(), "non-core builds only"); - } - - if (!VM.getVM().isDebugging()) { - if (Assert.ASSERTS_ENABLED) { - OopMapSet maps = cb.getOopMaps(); - Assert.that((maps != null) && (maps.getSize() > 0), "found null or empty OopMapSet for CodeBlob"); - } - } else { - // Hack for some topmost frames that have been found with empty - // OopMapSets. (Actually have not seen the null case, but don't - // want to take any chances.) See HSDB.showThreadStackMemory(). - OopMapSet maps = cb.getOopMaps(); - if ((maps == null) || (maps.getSize() == 0)) { - return; - } - } - - // Check if caller must update oop argument - regMap.setIncludeArgumentOops(cb.callerMustGCArguments()); - - int nofCallee = 0; - Address[] locs = new Address[2 * REG_COUNT + 1]; - VMReg [] regs = new VMReg [2 * REG_COUNT + 1]; - // ("+1" because REG_COUNT might be zero) - - // Scan through oopmap and find location of all callee-saved registers - // (we do not do update in place, since info could be overwritten) - OopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging); - if (Assert.ASSERTS_ENABLED) { - Assert.that(map != null, "no ptr map found"); - } - - OopMapValue omv = null; - for(OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.CALLEE_SAVED_VALUE); !oms.isDone(); oms.next()) { - omv = oms.getCurrent(); - if (Assert.ASSERTS_ENABLED) { - Assert.that(nofCallee < 2 * REG_COUNT, "overflow"); - } - regs[nofCallee] = omv.getContentReg(); - locs[nofCallee] = fr.oopMapRegToLocation(omv.getReg(), regMap); - nofCallee++; - } - - // Check that runtime stubs save all callee-saved registers - // After adapter frames were deleted C2 doesn't use callee save registers at present - if (Assert.ASSERTS_ENABLED) { - if (VM.getVM().isServerCompiler()) { - Assert.that(!cb.isRuntimeStub() || - (nofCallee >= SAVED_ON_ENTRY_REG_COUNT || nofCallee >= C_SAVED_ON_ENTRY_REG_COUNT), - "must save all"); - } - } - - // Copy found callee-saved register to reg_map - for (int i = 0; i < nofCallee; i++) { - regMap.setLocation(regs[i], locs[i]); - } - } -}