Mercurial > hg > truffle
view graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64SaveRegistersOp.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 | 45a73cd19baa |
children | d48b7a4b93e9 |
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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 static com.oracle.graal.lir.LIRInstruction.OperandFlag.*; 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.*; /** * Saves registers to stack slots. */ @Opcode("SAVE_REGISTER") public final class AMD64SaveRegistersOp extends AMD64RegistersPreservationOp { /** * The move instructions for saving the registers. */ protected final AMD64LIRInstruction[] savingMoves; /** * The move instructions for restoring the registers. */ protected final AMD64LIRInstruction[] restoringMoves; /** * The slots to which the registers are saved. */ @Def(STACK) protected final StackSlot[] slots; public AMD64SaveRegistersOp(AMD64LIRInstruction[] savingMoves, AMD64LIRInstruction[] restoringMoves, StackSlot[] slots) { this.savingMoves = savingMoves; this.restoringMoves = restoringMoves; this.slots = slots; } @Override public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { for (AMD64LIRInstruction savingMove : savingMoves) { if (savingMove != null) { savingMove.emitCode(tasm, masm); } } } /** * Prunes the set of registers saved by this operation to exclude those in {@code ignored} and * updates {@code debugInfo} with a {@linkplain DebugInfo#getCalleeSaveInfo() description} of * where each preserved register is saved. */ @Override public void update(Set<Register> ignored, DebugInfo debugInfo, FrameMap frameMap) { int preserved = 0; for (int i = 0; i < savingMoves.length; i++) { if (savingMoves[i] != null) { Register register = ValueUtil.asRegister(((MoveOp) savingMoves[i]).getInput()); if (ignored.contains(register)) { savingMoves[i] = null; restoringMoves[i] = null; } else { preserved++; } } } if (preserved != 0) { Register[] keys = new Register[preserved]; int[] values = new int[keys.length]; int mapIndex = 0; for (int i = 0; i < savingMoves.length; i++) { if (savingMoves[i] != null) { keys[mapIndex] = ValueUtil.asRegister(((MoveOp) savingMoves[i]).getInput()); values[mapIndex] = frameMap.indexForStackSlot(slots[i]); mapIndex++; } } assert mapIndex == preserved; debugInfo.setCalleeSaveInfo(new RegisterSaveLayout(keys, values)); } } }