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CodeCache.java
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CodeCache.java
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/*
* Copyright (c) 2000, 2020, 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.code;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;
public class CodeCache {
private static GrowableArray<CodeHeap> heapArray;
private static VirtualConstructor virtualConstructor;
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static synchronized void initialize(TypeDataBase db) {
Type type = db.lookupType("CodeCache");
// Get array of CodeHeaps
// Note: CodeHeap may be subclassed with optional private heap mechanisms.
Type codeHeapType = db.lookupType("CodeHeap");
VirtualBaseConstructor<CodeHeap> heapConstructor =
new VirtualBaseConstructor<>(db, codeHeapType, "sun.jvm.hotspot.memory", CodeHeap.class);
AddressField heapsField = type.getAddressField("_heaps");
heapArray = GrowableArray.create(heapsField.getValue(), heapConstructor);
virtualConstructor = new VirtualConstructor(db);
// Add mappings for all possible CodeBlob subclasses
virtualConstructor.addMapping("BufferBlob", BufferBlob.class);
virtualConstructor.addMapping("nmethod", NMethod.class);
virtualConstructor.addMapping("RuntimeStub", RuntimeStub.class);
virtualConstructor.addMapping("AdapterBlob", AdapterBlob.class);
virtualConstructor.addMapping("MethodHandlesAdapterBlob", MethodHandlesAdapterBlob.class);
virtualConstructor.addMapping("SafepointBlob", SafepointBlob.class);
virtualConstructor.addMapping("DeoptimizationBlob", DeoptimizationBlob.class);
if (VM.getVM().isServerCompiler()) {
virtualConstructor.addMapping("ExceptionBlob", ExceptionBlob.class);
virtualConstructor.addMapping("UncommonTrapBlob", UncommonTrapBlob.class);
}
}
public boolean contains(Address p) {
for (int i = 0; i < heapArray.length(); ++i) {
if (heapArray.at(i).contains(p)) {
return true;
}
}
return false;
}
/** When VM.getVM().isDebugging() returns true, this behaves like
findBlobUnsafe */
public CodeBlob findBlob(Address start) {
CodeBlob result = findBlobUnsafe(start);
if (result == null) return null;
if (VM.getVM().isDebugging()) {
return result;
}
// We could potientially look up non_entrant methods
// NOTE: this is effectively a "guarantee", and is slightly different from the one in the VM
if (Assert.ASSERTS_ENABLED) {
Assert.that(!(result.isZombie() || result.isLockedByVM()), "unsafe access to zombie method");
}
return result;
}
public CodeBlob findBlobUnsafe(Address start) {
CodeBlob result = null;
CodeHeap containing_heap = null;
for (int i = 0; i < heapArray.length(); ++i) {
if (heapArray.at(i).contains(start)) {
containing_heap = heapArray.at(i);
break;
}
}
if (containing_heap == null) {
return null;
}
try {
result = (CodeBlob) virtualConstructor.instantiateWrapperFor(containing_heap.findStart(start));
}
catch (WrongTypeException wte) {
Address cbAddr = null;
try {
cbAddr = containing_heap.findStart(start);
}
catch (Exception findEx) {
findEx.printStackTrace();
}
String message = "Couldn't deduce type of CodeBlob ";
if (cbAddr != null) {
message = message + "@" + cbAddr + " ";
}
message = message + "for PC=" + start;
throw new RuntimeException(message, wte);
}
if (result == null) return null;
if (Assert.ASSERTS_ENABLED) {
// The HeapBlock that contains this blob is outside of the blob
// but it shouldn't be an error to find a blob based on the
// pointer to the HeapBlock.
Assert.that(result.blobContains(start) || result.blobContains(start.addOffsetTo(8)),
"found wrong CodeBlob");
}
return result;
}
public NMethod findNMethod(Address start) {
CodeBlob cb = findBlob(start);
if (Assert.ASSERTS_ENABLED) {
Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
}
return (NMethod) cb;
}
public NMethod findNMethodUnsafe(Address start) {
CodeBlob cb = findBlobUnsafe(start);
if (Assert.ASSERTS_ENABLED) {
Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
}
return (NMethod) cb;
}
/** Routine for instantiating appropriately-typed wrapper for a
CodeBlob. Used by CodeCache, Runtime1, etc. */
public CodeBlob createCodeBlobWrapper(Address codeBlobAddr) {
try {
return (CodeBlob) virtualConstructor.instantiateWrapperFor(codeBlobAddr);
}
catch (Exception e) {
String message = "Unable to deduce type of CodeBlob from address " + codeBlobAddr +
" (expected type nmethod, RuntimeStub, ";
if (VM.getVM().isClientCompiler()) {
message = message + " or ";
}
message = message + "SafepointBlob";
if (VM.getVM().isServerCompiler()) {
message = message + ", DeoptimizationBlob, or ExceptionBlob";
}
message = message + ")";
throw new RuntimeException(message);
}
}
public void iterate(CodeCacheVisitor visitor) {
visitor.prologue(lowBound(), highBound());
for (int i = 0; i < heapArray.length(); ++i) {
CodeHeap current_heap = heapArray.at(i);
current_heap.iterate(visitor, this);
}
visitor.epilogue();
}
//--------------------------------------------------------------------------------
// Internals only below this point
//
private Address lowBound() {
Address low = heapArray.at(0).begin();
for (int i = 1; i < heapArray.length(); ++i) {
if (heapArray.at(i).begin().lessThan(low)) {
low = heapArray.at(i).begin();
}
}
return low;
}
private Address highBound() {
Address high = heapArray.at(0).end();
for (int i = 1; i < heapArray.length(); ++i) {
if (heapArray.at(i).end().greaterThan(high)) {
high = heapArray.at(i).end();
}
}
return high;
}
}