1 /* 2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.hotspot.aarch64; 24 25 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL; 26 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; 27 import static jdk.vm.ci.aarch64.AArch64.lr; 28 import static jdk.vm.ci.code.ValueUtil.asRegister; 29 30 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler; 31 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 32 import org.graalvm.compiler.lir.LIRInstructionClass; 33 import org.graalvm.compiler.lir.Opcode; 34 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 35 36 import jdk.vm.ci.meta.Value; 37 38 /** 39 * Returns from a function. 40 */ 41 @Opcode("RETURN") 42 public final class AArch64HotSpotReturnOp extends AArch64HotSpotEpilogueOp { 43 44 public static final LIRInstructionClass<AArch64HotSpotReturnOp> TYPE = LIRInstructionClass.create(AArch64HotSpotReturnOp.class); 45 46 @Use({REG, ILLEGAL}) private Value result; 47 private final boolean isStub; 48 49 public AArch64HotSpotReturnOp(Value result, boolean isStub, GraalHotSpotVMConfig config) { 50 super(TYPE, config); 51 assert validReturnValue(result); 52 this.result = result; 53 this.isStub = isStub; 54 } 55 56 private static boolean validReturnValue(Value result) { 57 if (result.equals(Value.ILLEGAL)) { 58 return true; 59 } 60 return asRegister(result).encoding == 0; 61 } 62 63 @Override 64 public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { 65 final boolean emitSafepoint = !isStub; 66 leaveFrame(crb, masm, emitSafepoint); 67 masm.ret(lr); 68 } 69 }