/*
 * Copyright (c) 2015, 2019, 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 org.graalvm.compiler.lir.aarch64;

import static jdk.vm.ci.code.ValueUtil.asRegister;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.COMPOSITE;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;

import org.graalvm.compiler.asm.aarch64.AArch64Address;
import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
import org.graalvm.compiler.lir.LIRFrameState;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.StandardOp.ImplicitNullCheck;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.AllocatableValue;
import jdk.vm.ci.meta.Value;

AARCH64 LIR instructions that have one input and one output.
/** * AARCH64 LIR instructions that have one input and one output. */
public class AArch64Unary {
Instruction with a memory operand.
/** * Instruction with a {@link AArch64AddressValue memory} operand. */
public static class MemoryOp extends AArch64LIRInstruction implements ImplicitNullCheck { public static final LIRInstructionClass<MemoryOp> TYPE = LIRInstructionClass.create(MemoryOp.class); private final boolean isSigned; @Def({REG}) protected AllocatableValue result; @Use({COMPOSITE}) protected AArch64AddressValue input; @State protected LIRFrameState state; private int targetSize; private int srcSize; public MemoryOp(boolean isSigned, int targetSize, int srcSize, AllocatableValue result, AArch64AddressValue input, LIRFrameState state) { super(TYPE); this.targetSize = targetSize; this.srcSize = srcSize; this.isSigned = isSigned; this.result = result; this.input = input; this.state = state; } @Override public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { int prePosition = masm.position(); AArch64Address address = input.toAddress(); Register dst = asRegister(result); if (isSigned) { masm.ldrs(targetSize, srcSize, dst, address); } else { masm.ldr(srcSize, dst, address); } if (state != null) { int implicitExceptionPosition = prePosition; // Adjust implicit exception position if this ldr/str has been merged to ldp/stp. if (prePosition == masm.position() && masm.isImmLoadStoreMerged()) { implicitExceptionPosition = prePosition - 4; if (crb.isImplicitExceptionExist(implicitExceptionPosition)) { return; } } crb.recordImplicitException(implicitExceptionPosition, state); } } @Override public boolean makeNullCheckFor(Value value, LIRFrameState nullCheckState, int implicitNullCheckLimit) { int displacement = input.getDisplacement(); if (state == null && value.equals(input.getBase()) && input.getOffset().equals(Value.ILLEGAL) && displacement >= 0 && displacement < implicitNullCheckLimit) { state = nullCheckState; return true; } return false; } } }