| /* |
| * Copyright (c) 2016, 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.amd64; |
| |
| import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; |
| import org.graalvm.compiler.lir.LIRInstructionClass; |
| import org.graalvm.compiler.lir.Opcode; |
| import org.graalvm.compiler.lir.asm.CompilationResultBuilder; |
| |
| import jdk.vm.ci.code.StackSlot; |
| import jdk.vm.ci.meta.JavaConstant; |
| |
| /** |
| * Writes well known garbage values to stack slots. |
| */ |
| @Opcode("ZAP_STACK") |
| public final class AMD64ZapStackOp extends AMD64LIRInstruction { |
| public static final LIRInstructionClass<AMD64ZapStackOp> TYPE = LIRInstructionClass.create(AMD64ZapStackOp.class); |
| |
| /** |
| * The stack slots that are zapped. |
| */ |
| @Def(OperandFlag.STACK) protected final StackSlot[] zappedStack; |
| |
| /** |
| * The garbage values that are written to the stack. |
| */ |
| protected final JavaConstant[] zapValues; |
| |
| public AMD64ZapStackOp(StackSlot[] zappedStack, JavaConstant[] zapValues) { |
| super(TYPE); |
| this.zappedStack = zappedStack; |
| this.zapValues = zapValues; |
| } |
| |
| @Override |
| public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) { |
| for (int i = 0; i < zappedStack.length; i++) { |
| StackSlot slot = zappedStack[i]; |
| if (slot != null) { |
| AMD64Move.const2stack(crb, masm, slot, zapValues[i]); |
| } |
| } |
| } |
| } |