Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64ZapRegistersOp.java @ 9491:789cfd153265
a compiled stub can now specify whether it needs to preserve registers. If a stub does not preserve registers and assertions are enabled, then all non-temporary registers are zapped after a C runtime call from the stub.
the ExceptionHandler stub no longer preserves registers
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 02 May 2013 06:08:02 +0200 |
parents | |
children | 6703dca691d7 |
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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.amd64; import java.util.*; import com.oracle.graal.api.code.*; import com.oracle.graal.asm.amd64.*; import com.oracle.graal.lir.*; import com.oracle.graal.lir.LIRInstruction.Opcode; import com.oracle.graal.lir.StandardOp.MoveOp; import com.oracle.graal.lir.asm.*; /** * Writes well known garbage values to registers. */ @Opcode("ZAP_REGISTER") public final class AMD64ZapRegistersOp extends AMD64RegistersPreservationOp { /** * The move instructions for zapping the registers. */ protected final AMD64LIRInstruction[] zappingMoves; public AMD64ZapRegistersOp(AMD64LIRInstruction[] zappingMoves) { this.zappingMoves = zappingMoves; } @Override public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { for (AMD64LIRInstruction zappingMove : zappingMoves) { if (zappingMove != null) { zappingMove.emitCode(tasm, masm); } } } /** * Prunes the set of registers zapped by this operation to exclude those in {@code ignored}. */ @Override public void update(Set<Register> ignored, DebugInfo debugInfo, FrameMap frameMap) { for (int i = 0; i < zappingMoves.length; i++) { if (zappingMoves[i] != null) { Register register = ValueUtil.asRegister(((MoveOp) zappingMoves[i]).getResult()); if (ignored.contains(register)) { zappingMoves[i] = null; } } } } }