1 /* 2 * Copyright (c) 2013, 2018, 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 24 25 package org.graalvm.compiler.lir.amd64; 26 27 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK; 28 import static jdk.vm.ci.code.ValueUtil.asStackSlot; 29 import static jdk.vm.ci.code.ValueUtil.isStackSlot; 30 31 import java.util.Arrays; 32 33 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; 34 import org.graalvm.compiler.lir.LIRInstructionClass; 35 import org.graalvm.compiler.lir.LIRValueUtil; 36 import org.graalvm.compiler.lir.Opcode; 37 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 38 39 import jdk.vm.ci.amd64.AMD64Kind; 40 import jdk.vm.ci.code.Register; 41 import jdk.vm.ci.code.StackSlot; 42 import jdk.vm.ci.meta.AllocatableValue; 43 44 /** 45 * Restores registers from stack slots. 46 */ 47 @Opcode("RESTORE_REGISTER") 48 public class AMD64RestoreRegistersOp extends AMD64LIRInstruction { 49 public static final LIRInstructionClass<AMD64RestoreRegistersOp> TYPE = LIRInstructionClass.create(AMD64RestoreRegistersOp.class); 50 51 /** 52 * The slots from which the registers are restored. 53 */ 54 @Use(STACK) protected final AllocatableValue[] slots; 55 56 /** 57 * The operation that saved the registers restored by this operation. 58 */ 59 private final AMD64SaveRegistersOp save; 60 61 public AMD64RestoreRegistersOp(AllocatableValue[] values, AMD64SaveRegistersOp save) { 62 this(TYPE, values, save); 63 } 64 65 protected AMD64RestoreRegistersOp(LIRInstructionClass<? extends AMD64RestoreRegistersOp> c, AllocatableValue[] values, AMD64SaveRegistersOp save) { 66 super(c); 67 assert Arrays.asList(values).stream().allMatch(LIRValueUtil::isVirtualStackSlot); 68 this.slots = values; 69 this.save = save; 70 } 71 72 protected Register[] getSavedRegisters() { 73 return save.savedRegisters; 74 } 75 76 protected void restoreRegister(CompilationResultBuilder crb, AMD64MacroAssembler masm, Register result, StackSlot input) { 77 AMD64Move.stack2reg((AMD64Kind) input.getPlatformKind(), crb, masm, result, input); 78 } 79 80 @Override 81 public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) { 82 Register[] savedRegisters = getSavedRegisters(); 83 for (int i = 0; i < savedRegisters.length; i++) { 84 if (savedRegisters[i] != null) { 85 assert isStackSlot(slots[i]) : "not a StackSlot: " + slots[i]; 86 restoreRegister(crb, masm, savedRegisters[i], asStackSlot(slots[i])); 87 } 88 } 89 } 90 }