| /* |
| * 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]); |
| } |
| } |
| } |