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/*
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* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.lir.sparc;
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import static jdk.vm.ci.code.ValueUtil.asStackSlot;
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import static jdk.vm.ci.code.ValueUtil.isStackSlot;
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import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;
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import static org.graalvm.compiler.lir.sparc.SPARCDelayedControlTransfer.DUMMY;
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import java.util.Arrays;
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import org.graalvm.collections.EconomicSet;
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import org.graalvm.compiler.asm.sparc.SPARCAddress;
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import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
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import org.graalvm.compiler.lir.LIRInstructionClass;
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import org.graalvm.compiler.lir.LIRValueUtil;
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import org.graalvm.compiler.lir.Opcode;
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import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
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import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
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import org.graalvm.compiler.lir.framemap.FrameMap;
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import jdk.vm.ci.code.Register;
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import jdk.vm.ci.code.RegisterSaveLayout;
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import jdk.vm.ci.code.RegisterValue;
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import jdk.vm.ci.code.StackSlot;
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import jdk.vm.ci.meta.AllocatableValue;
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import jdk.vm.ci.sparc.SPARC;
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/**
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* Saves registers to stack slots.
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*/
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@Opcode("SAVE_REGISTER")
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public class SPARCSaveRegistersOp extends SPARCLIRInstruction implements SaveRegistersOp {
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public static final LIRInstructionClass<SPARCSaveRegistersOp> TYPE = LIRInstructionClass.create(SPARCSaveRegistersOp.class);
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public static final Register RETURN_REGISTER_STORAGE = SPARC.d62;
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public static final SizeEstimate SIZE = SizeEstimate.create(32);
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/**
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* The registers (potentially) saved by this operation.
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*/
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protected final Register[] savedRegisters;
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/**
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* The slots to which the registers are saved.
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*/
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@Def(STACK) protected final AllocatableValue[] slots;
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/**
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* Specifies if {@link #remove(EconomicSet)} should have an effect.
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*/
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protected final boolean supportsRemove;
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/**
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*
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* @param savedRegisters the registers saved by this operation which may be subject to
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* {@linkplain #remove(EconomicSet) pruning}
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* @param savedRegisterLocations the slots to which the registers are saved
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* @param supportsRemove determines if registers can be {@linkplain #remove(EconomicSet) pruned}
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*/
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public SPARCSaveRegistersOp(Register[] savedRegisters, AllocatableValue[] savedRegisterLocations, boolean supportsRemove) {
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super(TYPE, SIZE);
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assert Arrays.asList(savedRegisterLocations).stream().allMatch(LIRValueUtil::isVirtualStackSlot);
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this.savedRegisters = savedRegisters;
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this.slots = savedRegisterLocations;
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this.supportsRemove = supportsRemove;
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}
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@Override
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public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
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// Can be used with VIS3
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// new Movxtod(SPARC.i0, RETURN_REGISTER_STORAGE).emit(masm);
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// We abuse the first stackslot for transferring i0 to return_register_storage
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// assert slots.length >= 1;
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SPARCAddress slot0Address = (SPARCAddress) crb.asAddress(slots[0]);
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masm.stx(SPARC.i0, slot0Address);
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masm.lddf(slot0Address, RETURN_REGISTER_STORAGE);
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// Now save the registers
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for (int i = 0; i < savedRegisters.length; i++) {
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if (savedRegisters[i] != null) {
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assert isStackSlot(slots[i]) : "not a StackSlot: " + slots[i];
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Register savedRegister = savedRegisters[i];
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StackSlot slot = asStackSlot(slots[i]);
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SPARCAddress slotAddress = (SPARCAddress) crb.asAddress(slot);
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RegisterValue input = savedRegister.asValue(slot.getValueKind());
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SPARCMove.emitStore(input, slotAddress, slot.getPlatformKind(), DUMMY, null, crb, masm);
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}
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}
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}
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public AllocatableValue[] getSlots() {
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return slots;
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}
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@Override
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public boolean supportsRemove() {
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return supportsRemove;
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}
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@Override
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public int remove(EconomicSet<Register> doNotSave) {
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if (!supportsRemove) {
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throw new UnsupportedOperationException();
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}
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return prune(doNotSave, savedRegisters);
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}
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static int prune(EconomicSet<Register> toRemove, Register[] registers) {
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int pruned = 0;
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for (int i = 0; i < registers.length; i++) {
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if (registers[i] != null) {
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if (toRemove.contains(registers[i])) {
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registers[i] = null;
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pruned++;
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}
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}
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}
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return pruned;
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}
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@Override
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public RegisterSaveLayout getMap(FrameMap frameMap) {
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int total = 0;
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for (int i = 0; i < savedRegisters.length; i++) {
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if (savedRegisters[i] != null) {
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total++;
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}
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}
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Register[] keys = new Register[total];
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int[] values = new int[total];
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if (total != 0) {
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int mapIndex = 0;
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for (int i = 0; i < savedRegisters.length; i++) {
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if (savedRegisters[i] != null) {
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keys[mapIndex] = savedRegisters[i];
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assert isStackSlot(slots[i]) : "not a StackSlot: " + slots[i];
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StackSlot slot = asStackSlot(slots[i]);
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values[mapIndex] = indexForStackSlot(frameMap, slot);
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mapIndex++;
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}
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}
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assert mapIndex == total;
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}
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return new RegisterSaveLayout(keys, values);
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}
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/**
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* Computes the index of a stack slot relative to slot 0. This is also the bit index of stack
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* slots in the reference map.
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*
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* @param slot a stack slot
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* @return the index of the stack slot
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*/
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private static int indexForStackSlot(FrameMap frameMap, StackSlot slot) {
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assert frameMap.offsetForStackSlot(slot) % frameMap.getTarget().wordSize == 0;
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int value = frameMap.offsetForStackSlot(slot) / frameMap.getTarget().wordSize;
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return value;
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}
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}
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