| /* |
| * Copyright (c) 2001, 2011, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 sun.reflect; |
| |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| /** Allows forward references in bytecode streams emitted by |
| ClassFileAssembler. Assumes that the start of the method body is |
| the first byte in the assembler's buffer. May be used at more than |
| one branch site. */ |
| |
| class Label { |
| static class PatchInfo { |
| PatchInfo(ClassFileAssembler asm, |
| short instrBCI, |
| short patchBCI, |
| int stackDepth) |
| { |
| this.asm = asm; |
| this.instrBCI = instrBCI; |
| this.patchBCI = patchBCI; |
| this.stackDepth = stackDepth; |
| } |
| // This won't work for more than one assembler anyway, so this is |
| // unnecessary |
| final ClassFileAssembler asm; |
| final short instrBCI; |
| final short patchBCI; |
| final int stackDepth; |
| } |
| private final List<PatchInfo> patches = new ArrayList<>(); |
| |
| public Label() { |
| } |
| |
| void add(ClassFileAssembler asm, |
| short instrBCI, |
| short patchBCI, |
| int stackDepth) |
| { |
| patches.add(new PatchInfo(asm, instrBCI, patchBCI, stackDepth)); |
| } |
| |
| public void bind() { |
| for (PatchInfo patch : patches){ |
| short curBCI = patch.asm.getLength(); |
| short offset = (short) (curBCI - patch.instrBCI); |
| patch.asm.emitShort(patch.patchBCI, offset); |
| patch.asm.setStack(patch.stackDepth); |
| } |
| } |
| } |