Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapCacheEntry.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapCacheEntry.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,156 @@ +/* + * Copyright 2001 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.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; + } +}