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528 lines
23 KiB
Java
528 lines
23 KiB
Java
/*
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* Copyright (c) 2000, 2020, 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.code;
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import java.io.*;
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import java.util.*;
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import sun.jvm.hotspot.debugger.*;
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import sun.jvm.hotspot.oops.*;
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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 NMethod extends CompiledMethod {
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private static long pcDescSize;
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/** != InvocationEntryBci if this nmethod is an on-stack replacement method */
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private static CIntegerField entryBCIField;
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/** To support simple linked-list chaining of nmethods */
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private static AddressField osrLinkField;
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/** Offsets for different nmethod parts */
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private static CIntegerField exceptionOffsetField;
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private static CIntegerField origPCOffsetField;
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private static CIntegerField stubOffsetField;
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private static CIntegerField oopsOffsetField;
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private static CIntegerField metadataOffsetField;
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private static CIntegerField scopesPCsOffsetField;
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private static CIntegerField dependenciesOffsetField;
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private static CIntegerField handlerTableOffsetField;
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private static CIntegerField nulChkTableOffsetField;
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private static CIntegerField nmethodEndOffsetField;
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/** Offsets for entry points */
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/** Entry point with class check */
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private static AddressField entryPointField;
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/** Entry point without class check */
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private static AddressField verifiedEntryPointField;
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/** Entry point for on stack replacement */
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private static AddressField osrEntryPointField;
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// FIXME: add access to flags (how?)
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/** NMethod Flushing lock (if non-zero, then the nmethod is not removed) */
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private static JIntField lockCountField;
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/** not_entrant method removal. Each mark_sweep pass will update
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this mark to current sweep invocation count if it is seen on the
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stack. An not_entrant method can be removed when there is no
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more activations, i.e., when the _stack_traversal_mark is less than
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current sweep traversal index. */
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private static CIntegerField stackTraversalMarkField;
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private static CIntegerField compLevelField;
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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("nmethod");
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entryBCIField = type.getCIntegerField("_entry_bci");
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osrLinkField = type.getAddressField("_osr_link");
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exceptionOffsetField = type.getCIntegerField("_exception_offset");
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origPCOffsetField = type.getCIntegerField("_orig_pc_offset");
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stubOffsetField = type.getCIntegerField("_stub_offset");
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oopsOffsetField = type.getCIntegerField("_oops_offset");
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metadataOffsetField = type.getCIntegerField("_metadata_offset");
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scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset");
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dependenciesOffsetField = type.getCIntegerField("_dependencies_offset");
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handlerTableOffsetField = type.getCIntegerField("_handler_table_offset");
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nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset");
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nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset");
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entryPointField = type.getAddressField("_entry_point");
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verifiedEntryPointField = type.getAddressField("_verified_entry_point");
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osrEntryPointField = type.getAddressField("_osr_entry_point");
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lockCountField = type.getJIntField("_lock_count");
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stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark");
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compLevelField = type.getCIntegerField("_comp_level");
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pcDescSize = db.lookupType("PcDesc").getSize();
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}
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public NMethod(Address addr) {
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super(addr);
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}
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// Accessors
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public Address getAddress() {
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return addr;
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}
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// Type info
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public boolean isNMethod() { return true; }
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public boolean isJavaMethod() { return !getMethod().isNative(); }
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public boolean isNativeMethod() { return getMethod().isNative(); }
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public boolean isOSRMethod() { return getEntryBCI() != VM.getVM().getInvocationEntryBCI(); }
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/** Boundaries for different parts */
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public Address constantsBegin() { return contentBegin(); }
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public Address constantsEnd() { return getEntryPoint(); }
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public Address instsBegin() { return codeBegin(); }
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public Address instsEnd() { return headerBegin().addOffsetTo(getStubOffset()); }
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public Address exceptionBegin() { return headerBegin().addOffsetTo(getExceptionOffset()); }
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public Address stubBegin() { return headerBegin().addOffsetTo(getStubOffset()); }
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public Address stubEnd() { return headerBegin().addOffsetTo(getOopsOffset()); }
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public Address oopsBegin() { return headerBegin().addOffsetTo(getOopsOffset()); }
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public Address oopsEnd() { return headerBegin().addOffsetTo(getMetadataOffset()); }
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public Address metadataBegin() { return headerBegin().addOffsetTo(getMetadataOffset()); }
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public Address metadataEnd() { return scopesDataBegin(); }
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public Address scopesDataEnd() { return headerBegin().addOffsetTo(getScopesPCsOffset()); }
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public Address scopesPCsBegin() { return headerBegin().addOffsetTo(getScopesPCsOffset()); }
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public Address scopesPCsEnd() { return headerBegin().addOffsetTo(getDependenciesOffset()); }
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public Address dependenciesBegin() { return headerBegin().addOffsetTo(getDependenciesOffset()); }
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public Address dependenciesEnd() { return headerBegin().addOffsetTo(getHandlerTableOffset()); }
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public Address handlerTableBegin() { return headerBegin().addOffsetTo(getHandlerTableOffset()); }
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public Address handlerTableEnd() { return headerBegin().addOffsetTo(getNulChkTableOffset()); }
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public Address nulChkTableBegin() { return headerBegin().addOffsetTo(getNulChkTableOffset()); }
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public Address nulChkTableEnd() { return headerBegin().addOffsetTo(getNMethodEndOffset()); }
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public int constantsSize() { return (int) constantsEnd() .minus(constantsBegin()); }
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public int instsSize() { return (int) instsEnd() .minus(instsBegin()); }
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public int stubSize() { return (int) stubEnd() .minus(stubBegin()); }
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public int oopsSize() { return (int) oopsEnd() .minus(oopsBegin()); }
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public int metadataSize() { return (int) metadataEnd() .minus(metadataBegin()); }
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public int scopesDataSize() { return (int) scopesDataEnd() .minus(scopesDataBegin()); }
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public int scopesPCsSize() { return (int) scopesPCsEnd() .minus(scopesPCsBegin()); }
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public int dependenciesSize() { return (int) dependenciesEnd().minus(dependenciesBegin()); }
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public int handlerTableSize() { return (int) handlerTableEnd().minus(handlerTableBegin()); }
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public int nulChkTableSize() { return (int) nulChkTableEnd() .minus(nulChkTableBegin()); }
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public int origPCOffset() { return (int) origPCOffsetField.getValue(addr); }
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public int totalSize() {
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return
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constantsSize() +
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instsSize() +
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stubSize() +
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scopesDataSize() +
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scopesPCsSize() +
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dependenciesSize() +
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handlerTableSize() +
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nulChkTableSize();
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}
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public boolean constantsContains (Address addr) { return constantsBegin() .lessThanOrEqual(addr) && constantsEnd() .greaterThan(addr); }
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public boolean instsContains (Address addr) { return instsBegin() .lessThanOrEqual(addr) && instsEnd() .greaterThan(addr); }
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public boolean stubContains (Address addr) { return stubBegin() .lessThanOrEqual(addr) && stubEnd() .greaterThan(addr); }
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public boolean oopsContains (Address addr) { return oopsBegin() .lessThanOrEqual(addr) && oopsEnd() .greaterThan(addr); }
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public boolean metadataContains (Address addr) { return metadataBegin() .lessThanOrEqual(addr) && metadataEnd() .greaterThan(addr); }
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public boolean scopesDataContains (Address addr) { return scopesDataBegin() .lessThanOrEqual(addr) && scopesDataEnd() .greaterThan(addr); }
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public boolean scopesPCsContains (Address addr) { return scopesPCsBegin() .lessThanOrEqual(addr) && scopesPCsEnd() .greaterThan(addr); }
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public boolean handlerTableContains(Address addr) { return handlerTableBegin().lessThanOrEqual(addr) && handlerTableEnd().greaterThan(addr); }
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public boolean nulChkTableContains (Address addr) { return nulChkTableBegin() .lessThanOrEqual(addr) && nulChkTableEnd() .greaterThan(addr); }
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public int getOopsLength() { return (int) (oopsSize() / VM.getVM().getOopSize()); }
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public int getMetadataLength() { return (int) (metadataSize() / VM.getVM().getOopSize()); }
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/** Entry points */
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public Address getEntryPoint() { return entryPointField.getValue(addr); }
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public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); }
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/** Support for oops in scopes and relocs. Note: index 0 is reserved for null. */
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public OopHandle getOopAt(int index) {
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if (index == 0) return null;
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(index > 0 && index <= getOopsLength(), "must be a valid non-zero index");
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}
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return oopsBegin().getOopHandleAt((index - 1) * VM.getVM().getOopSize());
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}
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/** Support for metadata in scopes and relocs. Note: index 0 is reserved for null. */
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public Address getMetadataAt(int index) {
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if (index == 0) return null;
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(index > 0 && index <= getMetadataLength(), "must be a valid non-zero index");
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}
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return metadataBegin().getAddressAt((index - 1) * VM.getVM().getOopSize());
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}
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public Method getMethodAt(int index) {
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return (Method)Metadata.instantiateWrapperFor(getMetadataAt(index));
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}
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// FIXME: add interpreter_entry_point()
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// FIXME: add lazy_interpreter_entry_point() for C2
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// **********
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// * FIXME: * ADD ACCESS TO FLAGS!!!!
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// **********
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// public boolean isInUse();
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// public boolean isAlive();
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// public boolean isNotEntrant();
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// public boolean isZombie();
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// ********************************
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// * MAJOR FIXME: MAJOR HACK HERE *
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// ********************************
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public boolean isZombie() { return false; }
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// public boolean isUnloaded();
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// public boolean isYoung();
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// public boolean isOld();
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// public int age();
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// public boolean isMarkedForDeoptimization();
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// public boolean isMarkedForUnloading();
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// public int level();
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// public int version();
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// FIXME: add mutators for above
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// FIXME: add exception cache access?
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/** On-stack replacement support */
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// FIXME: add mutators
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public int getOSREntryBCI() {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod");
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}
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return getEntryBCI();
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}
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public NMethod getOSRLink() {
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return (NMethod) VMObjectFactory.newObject(NMethod.class, osrLinkField.getValue(addr));
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}
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// MethodHandle
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public boolean isMethodHandleReturn(Address returnPc) {
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// Hard to read a bit fields from Java and it's only there for performance
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// so just go directly to the PCDesc
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// if (!hasMethodHandleInvokes()) return false;
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PCDesc pd = getPCDescAt(returnPc);
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if (pd == null)
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return false;
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return pd.isMethodHandleInvoke();
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}
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// Deopt
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// Return true is the PC is one would expect if the frame is being deopted.
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public boolean isDeoptPc (Address pc) { return isDeoptEntry(pc) || isDeoptMhEntry(pc); }
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public boolean isDeoptEntry (Address pc) { return pc == deoptHandlerBegin(); }
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public boolean isDeoptMhEntry (Address pc) { return pc == deoptMhHandlerBegin(); }
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/** Tells whether frames described by this nmethod can be
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deoptimized. Note: native wrappers cannot be deoptimized. */
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public boolean canBeDeoptimized() { return isJavaMethod(); }
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// FIXME: add inline cache support
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// FIXME: add flush()
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public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; }
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// FIXME: add mark_as_seen_on_stack
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// FIXME: add can_not_entrant_be_converted
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// FIXME: add GC support
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// void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading);
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// void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading);
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// void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*));
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// void adjust_pointers();
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/** Finds a PCDesc with real-pc equal to "pc" */
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public PCDesc getPCDescAt(Address pc) {
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// FIXME: consider adding cache like the one down in the VM
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for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
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PCDesc pcDesc = new PCDesc(p);
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if (pcDesc.getRealPC(this).equals(pc)) {
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return pcDesc;
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}
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}
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return null;
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}
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/** ScopeDesc for an instruction */
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public ScopeDesc getScopeDescAt(Address pc) {
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PCDesc pd = getPCDescAt(pc);
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(pd != null, "scope must be present");
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}
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return new ScopeDesc(this, pd.getScopeDecodeOffset(), pd.getObjDecodeOffset(), pd.getReexecute());
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}
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/** This is only for use by the debugging system, and is only
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intended for use in the topmost frame, where we are not
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guaranteed to be at a PC for which we have a PCDesc. It finds
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the PCDesc with realPC closest to the current PC that has
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a valid scope decode offset. */
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public PCDesc getPCDescNearDbg(Address pc) {
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PCDesc bestGuessPCDesc = null;
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long bestDistance = 0;
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for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
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PCDesc pcDesc = new PCDesc(p);
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if (pcDesc.getScopeDecodeOffset() == DebugInformationRecorder.SERIALIZED_NULL) {
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// We've observed a serialized null decode offset. Ignore this PcDesc.
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continue;
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}
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// In case pc is null
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long distance = -pcDesc.getRealPC(this).minus(pc);
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if ((bestGuessPCDesc == null) ||
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((distance >= 0) && (distance < bestDistance))) {
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bestGuessPCDesc = pcDesc;
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bestDistance = distance;
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}
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}
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return bestGuessPCDesc;
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}
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PCDesc find_pc_desc(long pc, boolean approximate) {
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return find_pc_desc_internal(pc, approximate);
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}
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// Finds a PcDesc with real-pc equal to "pc"
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PCDesc find_pc_desc_internal(long pc, boolean approximate) {
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long base_address = VM.getAddressValue(codeBegin());
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int pc_offset = (int) (pc - base_address);
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// Fallback algorithm: quasi-linear search for the PcDesc
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// Find the last pc_offset less than the given offset.
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// The successor must be the required match, if there is a match at all.
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// (Use a fixed radix to avoid expensive affine pointer arithmetic.)
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Address lower = scopesPCsBegin();
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Address upper = scopesPCsEnd();
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upper = upper.addOffsetTo(-pcDescSize); // exclude final sentinel
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if (lower.greaterThan(upper)) return null; // native method; no PcDescs at all
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// Take giant steps at first (4096, then 256, then 16, then 1)
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int LOG2_RADIX = 4;
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int RADIX = (1 << LOG2_RADIX);
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Address mid;
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for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
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while ((mid = lower.addOffsetTo(step * pcDescSize)).lessThan(upper)) {
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PCDesc m = new PCDesc(mid);
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if (m.getPCOffset() < pc_offset) {
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lower = mid;
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} else {
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upper = mid;
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break;
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}
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}
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}
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// Sneak up on the value with a linear search of length ~16.
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while (true) {
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mid = lower.addOffsetTo(pcDescSize);
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PCDesc m = new PCDesc(mid);
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if (m.getPCOffset() < pc_offset) {
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lower = mid;
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} else {
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upper = mid;
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break;
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}
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}
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PCDesc u = new PCDesc(upper);
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if (match_desc(u, pc_offset, approximate)) {
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return u;
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} else {
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return null;
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}
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}
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// ScopeDesc retrieval operation
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PCDesc pc_desc_at(long pc) { return find_pc_desc(pc, false); }
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// pc_desc_near returns the first PCDesc at or after the givne pc.
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PCDesc pc_desc_near(long pc) { return find_pc_desc(pc, true); }
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// Return a the last scope in (begin..end]
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public ScopeDesc scope_desc_in(long begin, long end) {
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PCDesc p = pc_desc_near(begin+1);
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if (p != null && VM.getAddressValue(p.getRealPC(this)) <= end) {
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return new ScopeDesc(this, p.getScopeDecodeOffset(), p.getObjDecodeOffset(), p.getReexecute());
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}
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return null;
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}
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static boolean match_desc(PCDesc pc, int pc_offset, boolean approximate) {
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if (!approximate) {
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return pc.getPCOffset() == pc_offset;
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} else {
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PCDesc prev = new PCDesc(pc.getAddress().addOffsetTo(-pcDescSize));
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return prev.getPCOffset() < pc_offset && pc_offset <= pc.getPCOffset();
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}
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}
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/** This is only for use by the debugging system, and is only
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intended for use in the topmost frame, where we are not
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guaranteed to be at a PC for which we have a PCDesc. It finds
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the ScopeDesc closest to the current PC. NOTE that this may
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return NULL for compiled methods which don't have any
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ScopeDescs! */
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public ScopeDesc getScopeDescNearDbg(Address pc) {
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PCDesc pd = getPCDescNearDbg(pc);
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if (pd == null) return null;
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return new ScopeDesc(this, pd.getScopeDecodeOffset(), pd.getObjDecodeOffset(), pd.getReexecute());
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}
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public Map<sun.jvm.hotspot.debugger.Address, PCDesc> getSafepoints() {
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Map<sun.jvm.hotspot.debugger.Address, PCDesc> safepoints = new HashMap<>();
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sun.jvm.hotspot.debugger.Address p = null;
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for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd());
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p = p.addOffsetTo(pcDescSize)) {
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PCDesc pcDesc = new PCDesc(p);
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sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this);
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safepoints.put(pc, pcDesc);
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}
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return safepoints;
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}
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// FIXME: add getPCOffsetForBCI()
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// FIXME: add embeddedOopAt()
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// 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(); }
|
|
|
|
public void print() {
|
|
printOn(System.out);
|
|
}
|
|
|
|
protected void printComponentsOn(PrintStream tty) {
|
|
// FIXME: add relocation information
|
|
tty.println(" content: [" + contentBegin() + ", " + contentEnd() + "), " +
|
|
" code: [" + codeBegin() + ", " + codeEnd() + "), " +
|
|
" data: [" + dataBegin() + ", " + dataEnd() + "), " +
|
|
" oops: [" + oopsBegin() + ", " + oopsEnd() + "), " +
|
|
" frame size: " + getFrameSize());
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
public void dumpReplayData(PrintStream out) {
|
|
HashMap<Metadata, Metadata> h = new HashMap<>();
|
|
for (int i = 1; i < getMetadataLength(); i++) {
|
|
Metadata meta = Metadata.instantiateWrapperFor(getMetadataAt(i));
|
|
System.err.println(meta);
|
|
if (h.get(meta) != null) continue;
|
|
h.put(meta, meta);
|
|
if (meta instanceof InstanceKlass) {
|
|
((InstanceKlass)meta).dumpReplayData(out);
|
|
} else if (meta instanceof Method) {
|
|
((Method)meta).dumpReplayData(out);
|
|
MethodData mdo = ((Method)meta).getMethodData();
|
|
if (mdo != null) {
|
|
mdo.dumpReplayData(out);
|
|
}
|
|
}
|
|
}
|
|
Method method = getMethod();
|
|
if (h.get(method) == null) {
|
|
method.dumpReplayData(out);
|
|
MethodData mdo = method.getMethodData();
|
|
if (mdo != null) {
|
|
mdo.dumpReplayData(out);
|
|
}
|
|
}
|
|
if (h.get(method.getMethodHolder()) == null) {
|
|
((InstanceKlass)method.getMethodHolder()).dumpReplayData(out);
|
|
}
|
|
Klass holder = method.getMethodHolder();
|
|
out.println("compile " + holder.getName().asString() + " " +
|
|
OopUtilities.escapeString(method.getName().asString()) + " " +
|
|
method.getSignature().asString() + " " +
|
|
getEntryBCI() + " " + getCompLevel());
|
|
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
// Internals only below this point
|
|
//
|
|
|
|
private int getEntryBCI() { return (int) entryBCIField .getValue(addr); }
|
|
private int getExceptionOffset() { return (int) exceptionOffsetField .getValue(addr); }
|
|
private int getStubOffset() { return (int) stubOffsetField .getValue(addr); }
|
|
private int getOopsOffset() { return (int) oopsOffsetField .getValue(addr); }
|
|
private int getMetadataOffset() { return (int) metadataOffsetField .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); }
|
|
private int getCompLevel() { return (int) compLevelField .getValue(addr); }
|
|
}
|