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76 lines
2.7 KiB
Java
76 lines
2.7 KiB
Java
/*
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* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.internal.reflect;
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import java.util.List;
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import java.util.ArrayList;
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/** Allows forward references in bytecode streams emitted by
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ClassFileAssembler. Assumes that the start of the method body is
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the first byte in the assembler's buffer. May be used at more than
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one branch site. */
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class Label {
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static class PatchInfo {
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PatchInfo(ClassFileAssembler asm,
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short instrBCI,
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short patchBCI,
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int stackDepth)
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{
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this.asm = asm;
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this.instrBCI = instrBCI;
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this.patchBCI = patchBCI;
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this.stackDepth = stackDepth;
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}
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// This won't work for more than one assembler anyway, so this is
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// unnecessary
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final ClassFileAssembler asm;
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final short instrBCI;
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final short patchBCI;
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final int stackDepth;
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}
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private final List<PatchInfo> patches = new ArrayList<>();
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public Label() {
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}
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void add(ClassFileAssembler asm,
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short instrBCI,
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short patchBCI,
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int stackDepth)
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{
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patches.add(new PatchInfo(asm, instrBCI, patchBCI, stackDepth));
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}
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public void bind() {
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for (PatchInfo patch : patches){
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short curBCI = patch.asm.getLength();
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short offset = (short) (curBCI - patch.instrBCI);
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patch.asm.emitShort(patch.patchBCI, offset);
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patch.asm.setStack(patch.stackDepth);
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}
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}
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}
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