Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapCacheEntry.java @ 19491:4d66c000d253
Truffle/Instrumentation: more cleanup in Probe
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 18 Feb 2015 18:30:49 -0800 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2001, 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.interpreter; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.utilities.*; public class OopMapCacheEntry { // Iteration public boolean isValue(int offset) { return !entryAt(offset); } public boolean isOop (int offset) { return entryAt(offset); } public void iterateOop(OffsetClosure oopClosure) { int n = numberOfEntries(); for (int i = 0; i < n; i++) { if (entryAt(i)) { oopClosure.offsetDo(i); } } } // Initialization public void fill(Method method, int bci) { this.method = method; this.bci = bci; if (method.isNative()) { // Native method activations have oops only among the parameters and one // extra oop following the parameters (the mirror for static native methods). fillForNative(); } else { OopMapForCacheEntry gen = new OopMapForCacheEntry(method, bci, this); gen.computeMap(); } } public void setMask(CellTypeStateList vars, CellTypeStateList stack, int stackTop) { // compute bit mask size int maxLocals = (int) method.getMaxLocals(); int nEntries = maxLocals + stackTop; maskSize = nEntries; allocateBitMask(); CellTypeStateList curList = vars; int listIdx = 0; for (int entryIdx = 0; entryIdx < nEntries; entryIdx++, listIdx++) { // switch to stack when done with locals if (entryIdx == maxLocals) { curList = stack; listIdx = 0; } CellTypeState cell = curList.get(listIdx); // set oop bit if ( cell.isReference()) { mask.atPut(entryIdx, true); } } // verify bit mask if (Assert.ASSERTS_ENABLED) { Assert.that(verifyMask(vars, stack, maxLocals, stackTop), "mask could not be verified"); } } //---------------------------------------------------------------------- // Internals only below this point // private Method method; // the method for which the mask is valid private int bci; // the bci for which the mask is valid private int maskSize; // the required mask size in bits private BitMap mask; // may be null if mask is empty Method method() { return method; } int bci() { return bci; } int numberOfEntries() { return maskSize; } boolean entryAt(int offset) { return mask.at(offset); } void setEmptyMask() { mask = null; } void allocateBitMask() { if (maskSize > 0) { mask = new BitMap(maskSize); } } // fills the bit mask for native calls void fillForNative() { if (Assert.ASSERTS_ENABLED) { Assert.that(method.isNative(), "method must be native method"); } maskSize = (int) method.getSizeOfParameters(); allocateBitMask(); // fill mask for parameters MaskFillerForNative mf = new MaskFillerForNative(method, mask, maskSize); mf.generate(); } static class VerifyClosure implements OffsetClosure { private OopMapCacheEntry entry; private boolean failed; VerifyClosure(OopMapCacheEntry entry) { this.entry = entry; } public void offsetDo(int offset) { if (!entry.isOop(offset)) failed = true; } boolean failed() { return failed; } } boolean verifyMask(CellTypeStateList vars, CellTypeStateList stack, int maxLocals, int stackTop) { // Check mask includes map VerifyClosure blk = new VerifyClosure(this); iterateOop(blk); if (blk.failed()) return false; // Check if map is generated correctly for(int i = 0; i < maxLocals; i++) { boolean v1 = isOop(i); boolean v2 = vars.get(i).isReference(); if (Assert.ASSERTS_ENABLED) { Assert.that(v1 == v2, "locals oop mask generation error"); } } for(int j = 0; j < stackTop; j++) { boolean v1 = isOop(maxLocals + j); boolean v2 = stack.get(j).isReference(); if (Assert.ASSERTS_ENABLED) { Assert.that(v1 == v2, "stack oop mask generation error"); } } return true; } }