src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64ZapRegistersOp.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64ZapRegistersOp.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2013, 2015, 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 static org.graalvm.compiler.lir.amd64.AMD64SaveRegistersOp.prune;
+
+import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
+import org.graalvm.compiler.lir.LIRInstructionClass;
+import org.graalvm.compiler.lir.Opcode;
+import org.graalvm.compiler.lir.StandardOp.SaveRegistersOp;
+import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
+import org.graalvm.compiler.lir.framemap.FrameMap;
+import org.graalvm.util.EconomicSet;
+
+import jdk.vm.ci.code.Register;
+import jdk.vm.ci.code.RegisterSaveLayout;
+import jdk.vm.ci.meta.JavaConstant;
+
+/**
+ * Writes well known garbage values to registers.
+ */
+@Opcode("ZAP_REGISTER")
+public final class AMD64ZapRegistersOp extends AMD64LIRInstruction implements SaveRegistersOp {
+ public static final LIRInstructionClass<AMD64ZapRegistersOp> TYPE = LIRInstructionClass.create(AMD64ZapRegistersOp.class);
+
+ /**
+ * The registers that are zapped.
+ */
+ protected final Register[] zappedRegisters;
+
+ /**
+ * The garbage values that are written to the registers.
+ */
+ protected final JavaConstant[] zapValues;
+
+ public AMD64ZapRegistersOp(Register[] zappedRegisters, JavaConstant[] zapValues) {
+ super(TYPE);
+ this.zappedRegisters = zappedRegisters;
+ this.zapValues = zapValues;
+ }
+
+ @Override
+ public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
+ for (int i = 0; i < zappedRegisters.length; i++) {
+ Register reg = zappedRegisters[i];
+ if (reg != null) {
+ AMD64Move.const2reg(crb, masm, reg, zapValues[i]);
+ }
+ }
+ }
+
+ @Override
+ public boolean supportsRemove() {
+ return true;
+ }
+
+ @Override
+ public int remove(EconomicSet<Register> doNotSave) {
+ return prune(doNotSave, zappedRegisters);
+ }
+
+ @Override
+ public RegisterSaveLayout getMap(FrameMap frameMap) {
+ return new RegisterSaveLayout(new Register[0], new int[0]);
+ }
+}