Mercurial > hg > truffle
view graal/com.oracle.graal.lir.amd64/src/com/oracle/graal/lir/amd64/AMD64SaveRegistersOp.java @ 9871:acba1a273f9b
LIRGenerator.emitForeignCall uses linkage to determine if a state is needed
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 05 Jun 2013 11:10:08 +0200 |
parents | fbeda9df497d |
children | 9808158cfeab |
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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.asm.*; /** * Saves registers to stack slots. */ @Opcode("SAVE_REGISTER") public class AMD64SaveRegistersOp extends AMD64RegistersPreservationOp { /** * The registers (potentially) saved by this operation. */ protected final Register[] savedRegisters; /** * The slots to which the registers are saved. */ @Def(STACK) protected final StackSlot[] slots; public AMD64SaveRegistersOp(Register[] savedRegisters, StackSlot[] slots) { this.savedRegisters = savedRegisters; this.slots = slots; } protected void saveRegister(TargetMethodAssembler tasm, AMD64MacroAssembler masm, StackSlot result, Register register) { RegisterValue input = register.asValue(result.getKind()); AMD64Move.move(tasm, masm, result, input); } @Override public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) { for (int i = 0; i < savedRegisters.length; i++) { if (savedRegisters[i] != null) { saveRegister(tasm, masm, slots[i], savedRegisters[i]); } } } public StackSlot[] getSlots() { return slots; } /** * 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 < savedRegisters.length; i++) { if (savedRegisters[i] != null) { if (ignored.contains(savedRegisters[i])) { savedRegisters[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 < savedRegisters.length; i++) { if (savedRegisters[i] != null) { keys[mapIndex] = savedRegisters[i]; values[mapIndex] = frameMap.indexForStackSlot(slots[i]); mapIndex++; } } assert mapIndex == preserved; debugInfo.setCalleeSaveInfo(new RegisterSaveLayout(keys, values)); } } }