| /* |
| * Copyright (c) 2012, 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.hotspot.amd64; |
| |
| import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL; |
| import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; |
| |
| import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; |
| import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; |
| import org.graalvm.compiler.lir.LIRInstructionClass; |
| import org.graalvm.compiler.lir.Opcode; |
| import org.graalvm.compiler.lir.asm.CompilationResultBuilder; |
| import org.graalvm.compiler.lir.gen.DiagnosticLIRGeneratorTool.ZapStackArgumentSpaceBeforeInstruction; |
| |
| import jdk.vm.ci.amd64.AMD64.CPUFeature; |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.meta.Value; |
| |
| /** |
| * Returns from a function. |
| */ |
| @Opcode("RETURN") |
| final class AMD64HotSpotReturnOp extends AMD64HotSpotEpilogueBlockEndOp implements ZapStackArgumentSpaceBeforeInstruction { |
| |
| public static final LIRInstructionClass<AMD64HotSpotReturnOp> TYPE = LIRInstructionClass.create(AMD64HotSpotReturnOp.class); |
| @Use({REG, ILLEGAL}) protected Value value; |
| private final boolean isStub; |
| private final Register scratchForSafepointOnReturn; |
| private final GraalHotSpotVMConfig config; |
| |
| AMD64HotSpotReturnOp(Value value, boolean isStub, Register scratchForSafepointOnReturn, GraalHotSpotVMConfig config) { |
| super(TYPE); |
| this.value = value; |
| this.isStub = isStub; |
| this.scratchForSafepointOnReturn = scratchForSafepointOnReturn; |
| this.config = config; |
| } |
| |
| @Override |
| public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) { |
| leaveFrameAndRestoreRbp(crb, masm); |
| if (!isStub) { |
| // Every non-stub compile method must have a poll before the return. |
| AMD64HotSpotSafepointOp.emitCode(crb, masm, config, true, null, scratchForSafepointOnReturn); |
| |
| /* |
| * We potentially return to the interpreter, and that's an AVX-SSE transition. The only |
| * live value at this point should be the return value in either rax, or in xmm0 with |
| * the upper half of the register unused, so we don't destroy any value here. |
| */ |
| if (masm.supports(CPUFeature.AVX)) { |
| masm.vzeroupper(); |
| } |
| } |
| masm.ret(0); |
| } |
| } |