| /* |
| * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.code; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.memory.*; |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| public class NMethod extends CodeBlob { |
| private static long pcDescSize; |
| private static CIntegerField zombieInstructionSizeField; |
| private static sun.jvm.hotspot.types.OopField methodField; |
| /** != InvocationEntryBci if this nmethod is an on-stack replacement method */ |
| private static CIntegerField entryBCIField; |
| /** To support simple linked-list chaining of nmethods */ |
| private static AddressField linkField; |
| /** Offsets for different nmethod parts */ |
| private static CIntegerField exceptionOffsetField; |
| private static CIntegerField deoptOffsetField; |
| private static CIntegerField origPCOffsetField; |
| private static CIntegerField stubOffsetField; |
| private static CIntegerField scopesDataOffsetField; |
| private static CIntegerField scopesPCsOffsetField; |
| private static CIntegerField dependenciesOffsetField; |
| private static CIntegerField handlerTableOffsetField; |
| private static CIntegerField nulChkTableOffsetField; |
| private static CIntegerField nmethodEndOffsetField; |
| |
| /** Offsets for entry points */ |
| /** Entry point with class check */ |
| private static AddressField entryPointField; |
| /** Entry point without class check */ |
| private static AddressField verifiedEntryPointField; |
| /** Entry point for on stack replacement */ |
| private static AddressField osrEntryPointField; |
| |
| // FIXME: add access to flags (how?) |
| |
| /** NMethod Flushing lock (if non-zero, then the nmethod is not removed) */ |
| private static JIntField lockCountField; |
| |
| /** not_entrant method removal. Each mark_sweep pass will update |
| this mark to current sweep invocation count if it is seen on the |
| stack. An not_entrant method can be removed when there is no |
| more activations, i.e., when the _stack_traversal_mark is less than |
| current sweep traversal index. */ |
| private static CIntegerField stackTraversalMarkField; |
| |
| 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("nmethod"); |
| |
| zombieInstructionSizeField = type.getCIntegerField("_zombie_instruction_size"); |
| methodField = type.getOopField("_method"); |
| entryBCIField = type.getCIntegerField("_entry_bci"); |
| linkField = type.getAddressField("_link"); |
| exceptionOffsetField = type.getCIntegerField("_exception_offset"); |
| deoptOffsetField = type.getCIntegerField("_deoptimize_offset"); |
| origPCOffsetField = type.getCIntegerField("_orig_pc_offset"); |
| stubOffsetField = type.getCIntegerField("_stub_offset"); |
| scopesDataOffsetField = type.getCIntegerField("_scopes_data_offset"); |
| scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset"); |
| dependenciesOffsetField = type.getCIntegerField("_dependencies_offset"); |
| handlerTableOffsetField = type.getCIntegerField("_handler_table_offset"); |
| nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset"); |
| nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset"); |
| entryPointField = type.getAddressField("_entry_point"); |
| verifiedEntryPointField = type.getAddressField("_verified_entry_point"); |
| osrEntryPointField = type.getAddressField("_osr_entry_point"); |
| lockCountField = type.getJIntField("_lock_count"); |
| stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark"); |
| |
| pcDescSize = db.lookupType("PcDesc").getSize(); |
| } |
| |
| public NMethod(Address addr) { |
| super(addr); |
| } |
| |
| |
| // Accessors |
| public Address getAddress() { |
| return addr; |
| } |
| |
| public Method getMethod() { |
| return (Method) VM.getVM().getObjectHeap().newOop(methodField.getValue(addr)); |
| } |
| |
| // Type info |
| public boolean isNMethod() { return true; } |
| public boolean isJavaMethod() { return !getMethod().isNative(); } |
| public boolean isNativeMethod() { return getMethod().isNative(); } |
| public boolean isOSRMethod() { return getEntryBCI() != VM.getVM().getInvocationEntryBCI(); } |
| |
| /** Boundaries for different parts */ |
| public Address constantsBegin() { return instructionsBegin(); } |
| public Address constantsEnd() { return getEntryPoint(); } |
| public Address codeBegin() { return getEntryPoint(); } |
| public Address codeEnd() { return headerBegin().addOffsetTo(getStubOffset()); } |
| public Address exceptionBegin() { return headerBegin().addOffsetTo(getExceptionOffset()); } |
| public Address deoptBegin() { return headerBegin().addOffsetTo(getDeoptOffset()); } |
| public Address stubBegin() { return headerBegin().addOffsetTo(getStubOffset()); } |
| public Address stubEnd() { return headerBegin().addOffsetTo(getScopesDataOffset()); } |
| public Address scopesDataBegin() { return headerBegin().addOffsetTo(getScopesDataOffset()); } |
| public Address scopesDataEnd() { return headerBegin().addOffsetTo(getScopesPCsOffset()); } |
| public Address scopesPCsBegin() { return headerBegin().addOffsetTo(getScopesPCsOffset()); } |
| public Address scopesPCsEnd() { return headerBegin().addOffsetTo(getDependenciesOffset()); } |
| public Address dependenciesBegin() { return headerBegin().addOffsetTo(getDependenciesOffset()); } |
| public Address dependenciesEnd() { return headerBegin().addOffsetTo(getHandlerTableOffset()); } |
| public Address handlerTableBegin() { return headerBegin().addOffsetTo(getHandlerTableOffset()); } |
| public Address handlerTableEnd() { return headerBegin().addOffsetTo(getNulChkTableOffset()); } |
| public Address nulChkTableBegin() { return headerBegin().addOffsetTo(getNulChkTableOffset()); } |
| public Address nulChkTableEnd() { return headerBegin().addOffsetTo(getNMethodEndOffset()); } |
| |
| public int constantsSize() { return (int) constantsEnd() .minus(constantsBegin()); } |
| public int codeSize() { return (int) codeEnd() .minus(codeBegin()); } |
| public int stubSize() { return (int) stubEnd() .minus(stubBegin()); } |
| public int scopesDataSize() { return (int) scopesDataEnd() .minus(scopesDataBegin()); } |
| public int scopesPCsSize() { return (int) scopesPCsEnd() .minus(scopesPCsBegin()); } |
| public int dependenciesSize() { return (int) dependenciesEnd().minus(dependenciesBegin()); } |
| public int handlerTableSize() { return (int) handlerTableEnd().minus(handlerTableBegin()); } |
| public int nulChkTableSize() { return (int) nulChkTableEnd() .minus(nulChkTableBegin()); } |
| public int origPCOffset() { return (int) origPCOffsetField.getValue(addr); } |
| |
| public int totalSize() { |
| return |
| constantsSize() + |
| codeSize() + |
| stubSize() + |
| scopesDataSize() + |
| scopesPCsSize() + |
| dependenciesSize() + |
| handlerTableSize() + |
| nulChkTableSize(); |
| } |
| |
| public boolean constantsContains (Address addr) { return constantsBegin() .lessThanOrEqual(addr) && constantsEnd() .greaterThan(addr); } |
| public boolean codeContains (Address addr) { return codeBegin() .lessThanOrEqual(addr) && codeEnd() .greaterThan(addr); } |
| public boolean stubContains (Address addr) { return stubBegin() .lessThanOrEqual(addr) && stubEnd() .greaterThan(addr); } |
| public boolean scopesDataContains (Address addr) { return scopesDataBegin() .lessThanOrEqual(addr) && scopesDataEnd() .greaterThan(addr); } |
| public boolean scopesPCsContains (Address addr) { return scopesPCsBegin() .lessThanOrEqual(addr) && scopesPCsEnd() .greaterThan(addr); } |
| public boolean handlerTableContains(Address addr) { return handlerTableBegin().lessThanOrEqual(addr) && handlerTableEnd().greaterThan(addr); } |
| public boolean nulChkTableContains (Address addr) { return nulChkTableBegin() .lessThanOrEqual(addr) && nulChkTableEnd() .greaterThan(addr); } |
| |
| /** Entry points */ |
| public Address getEntryPoint() { return entryPointField.getValue(addr); } |
| public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); } |
| |
| // FIXME: add interpreter_entry_point() |
| // FIXME: add lazy_interpreter_entry_point() for C2 |
| |
| // ********** |
| // * FIXME: * ADD ACCESS TO FLAGS!!!! |
| // ********** |
| // public boolean isInUse(); |
| // public boolean isAlive(); |
| // public boolean isNotEntrant(); |
| // public boolean isZombie(); |
| |
| // ******************************** |
| // * MAJOR FIXME: MAJOR HACK HERE * |
| // ******************************** |
| public boolean isZombie() { return false; } |
| |
| // public boolean isUnloaded(); |
| // public boolean isYoung(); |
| // public boolean isOld(); |
| // public int age(); |
| // public boolean isMarkedForDeoptimization(); |
| // public boolean isMarkedForUnloading(); |
| // public boolean isMarkedForReclamation(); |
| // public int level(); |
| // public int version(); |
| |
| // FIXME: add mutators for above |
| // FIXME: add exception cache access? |
| |
| /** On-stack replacement support */ |
| // FIXME: add mutators |
| public int getOSREntryBCI() { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod"); |
| } |
| return getEntryBCI(); |
| } |
| |
| public NMethod getLink() { |
| return (NMethod) VMObjectFactory.newObject(NMethod.class, linkField.getValue(addr)); |
| } |
| |
| /** Tells whether frames described by this nmethod can be |
| deoptimized. Note: native wrappers cannot be deoptimized. */ |
| public boolean canBeDeoptimized() { return isJavaMethod(); } |
| |
| // FIXME: add inline cache support |
| // FIXME: add flush() |
| |
| public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; } |
| |
| // FIXME: add mark_as_seen_on_stack |
| // FIXME: add can_not_entrant_be_converted |
| |
| // FIXME: add GC support |
| // void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading); |
| // void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading); |
| // void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*)); |
| // void adjust_pointers(); |
| |
| /** Finds a PCDesc with real-pc equal to "pc" */ |
| public PCDesc getPCDescAt(Address pc) { |
| // FIXME: consider adding cache like the one down in the VM |
| for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) { |
| PCDesc pcDesc = new PCDesc(p); |
| if (pcDesc.getRealPC(this).equals(pc)) { |
| return pcDesc; |
| } |
| } |
| return null; |
| } |
| |
| /** ScopeDesc for an instruction */ |
| public ScopeDesc getScopeDescAt(Address pc) { |
| PCDesc pd = getPCDescAt(pc); |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(pd != null, "scope must be present"); |
| } |
| return new ScopeDesc(this, pd.getScopeDecodeOffset()); |
| } |
| |
| /** This is only for use by the debugging system, and is only |
| intended for use in the topmost frame, where we are not |
| guaranteed to be at a PC for which we have a PCDesc. It finds |
| the PCDesc with realPC closest to the current PC. */ |
| public PCDesc getPCDescNearDbg(Address pc) { |
| PCDesc bestGuessPCDesc = null; |
| long bestDistance = 0; |
| for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) { |
| PCDesc pcDesc = new PCDesc(p); |
| // In case pc is null |
| long distance = -pcDesc.getRealPC(this).minus(pc); |
| if ((bestGuessPCDesc == null) || |
| ((distance >= 0) && (distance < bestDistance))) { |
| bestGuessPCDesc = pcDesc; |
| bestDistance = distance; |
| } |
| } |
| return bestGuessPCDesc; |
| } |
| |
| /** This is only for use by the debugging system, and is only |
| intended for use in the topmost frame, where we are not |
| guaranteed to be at a PC for which we have a PCDesc. It finds |
| the ScopeDesc closest to the current PC. NOTE that this may |
| return NULL for compiled methods which don't have any |
| ScopeDescs! */ |
| public ScopeDesc getScopeDescNearDbg(Address pc) { |
| PCDesc pd = getPCDescNearDbg(pc); |
| if (pd == null) return null; |
| return new ScopeDesc(this, pd.getScopeDecodeOffset()); |
| } |
| |
| public Map/*<Address, PcDesc>*/ getSafepoints() { |
| Map safepoints = new HashMap(); // Map<Address, PcDesc> |
| sun.jvm.hotspot.debugger.Address p = null; |
| for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); |
| p = p.addOffsetTo(pcDescSize)) { |
| PCDesc pcDesc = new PCDesc(p); |
| sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this); |
| safepoints.put(pc, pcDesc); |
| } |
| return safepoints; |
| } |
| |
| // FIXME: add getPCOffsetForBCI() |
| // FIXME: add embeddedOopAt() |
| // FIXME: add isDependentOn() |
| // FIXME: add isPatchableAt() |
| |
| /** Support for code generation. Only here for proof-of-concept. */ |
| public static int getEntryPointOffset() { return (int) entryPointField.getOffset(); } |
| public static int getVerifiedEntryPointOffset() { return (int) verifiedEntryPointField.getOffset(); } |
| public static int getOSREntryPointOffset() { return (int) osrEntryPointField.getOffset(); } |
| public static int getEntryBCIOffset() { return (int) entryBCIField.getOffset(); } |
| /** NOTE: renamed from "method_offset_in_bytes" */ |
| public static int getMethodOffset() { return (int) methodField.getOffset(); } |
| |
| public void print() { |
| printOn(System.out); |
| } |
| |
| public String toString() { |
| Method method = getMethod(); |
| return "NMethod for " + |
| method.getMethodHolder().getName().asString() + "." + |
| method.getName().asString() + method.getSignature().asString() + "==>n" + |
| super.toString(); |
| } |
| |
| public String flagsToString() { |
| // FIXME need access to flags... |
| return ""; |
| } |
| |
| public String getName() { |
| Method method = getMethod(); |
| return "NMethod for " + |
| method.getMethodHolder().getName().asString() + "." + |
| method.getName().asString() + |
| method.getSignature().asString(); |
| } |
| |
| //-------------------------------------------------------------------------------- |
| // Internals only below this point |
| // |
| |
| private int getEntryBCI() { return (int) entryBCIField .getValue(addr); } |
| private int getExceptionOffset() { return (int) exceptionOffsetField .getValue(addr); } |
| private int getDeoptOffset() { return (int) deoptOffsetField .getValue(addr); } |
| private int getStubOffset() { return (int) stubOffsetField .getValue(addr); } |
| private int getScopesDataOffset() { return (int) scopesDataOffsetField .getValue(addr); } |
| private int getScopesPCsOffset() { return (int) scopesPCsOffsetField .getValue(addr); } |
| private int getDependenciesOffset() { return (int) dependenciesOffsetField.getValue(addr); } |
| private int getHandlerTableOffset() { return (int) handlerTableOffsetField.getValue(addr); } |
| private int getNulChkTableOffset() { return (int) nulChkTableOffsetField .getValue(addr); } |
| private int getNMethodEndOffset() { return (int) nmethodEndOffsetField .getValue(addr); } |
| } |
