Mercurial > hg > truffle
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/NullCheckOptimizer.java @ 19337:dd3e15cfe5b8
Canonicalize CheckCastNode to unique concrete subtype on creation.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 12 Feb 2015 22:34:39 +0100 |
parents | ae17c7a2f7b1 |
children | cb7e8c0da978 |
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/* * Copyright (c) 2013, 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 com.oracle.graal.lir; import java.util.*; import com.oracle.graal.api.code.*; import com.oracle.graal.compiler.common.cfg.*; import com.oracle.graal.lir.StandardOp.ImplicitNullCheck; import com.oracle.graal.lir.StandardOp.NullCheck; import com.oracle.graal.lir.gen.*; import com.oracle.graal.lir.phases.*; public final class NullCheckOptimizer extends LIRLowTierPhase { @Override protected <B extends AbstractBlock<B>> void run(TargetDescription target, LIRGenerationResult lirGenRes, List<B> codeEmittingOrder, List<B> linearScanOrder) { LIR ir = lirGenRes.getLIR(); List<? extends AbstractBlock<?>> blocks = ir.codeEmittingOrder(); NullCheckOptimizer.foldNullChecks(ir, blocks, target.implicitNullCheckLimit); } private static void foldNullChecks(LIR ir, List<? extends AbstractBlock<?>> blocks, int implicitNullCheckLimit) { for (AbstractBlock<?> block : blocks) { List<LIRInstruction> list = ir.getLIRforBlock(block); if (!list.isEmpty()) { LIRInstruction lastInstruction = list.get(0); for (int i = 0; i < list.size(); i++) { LIRInstruction instruction = list.get(i); if (instruction instanceof ImplicitNullCheck && lastInstruction instanceof NullCheck) { NullCheck nullCheck = (NullCheck) lastInstruction; ImplicitNullCheck implicitNullCheck = (ImplicitNullCheck) instruction; if (implicitNullCheck.makeNullCheckFor(nullCheck.getCheckedValue(), nullCheck.getState(), implicitNullCheckLimit)) { list.remove(i - 1); if (i < list.size()) { instruction = list.get(i); } } } lastInstruction = instruction; } } } } }