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| 1 | /* | ||
| 2 | * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.reflect; | ||
| 27 | |||
| 28 | import java.util.Iterator; | ||
| 29 | import java.util.List; | ||
| 30 | import java.util.ArrayList; | ||
| 31 | |||
| 32 | /** Allows forward references in bytecode streams emitted by | ||
| 33 | ClassFileAssembler. Assumes that the start of the method body is | ||
| 34 | the first byte in the assembler's buffer. May be used at more than | ||
| 35 | one branch site. */ | ||
| 36 | |||
| 37 | class Label { | ||
| 38 | static class PatchInfo { | ||
| 39 | PatchInfo(ClassFileAssembler asm, | ||
| 40 | short instrBCI, | ||
| 41 | short patchBCI, | ||
| 42 | int stackDepth) | ||
| 43 | { | ||
| 44 | this.asm = asm; | ||
| 45 | this.instrBCI = instrBCI; | ||
| 46 | this.patchBCI = patchBCI; | ||
| 47 | this.stackDepth = stackDepth; | ||
| 48 | } | ||
| 49 | // This won't work for more than one assembler anyway, so this is | ||
| 50 | // unnecessary | ||
| 51 | ClassFileAssembler asm; | ||
| 52 | short instrBCI; | ||
| 53 | short patchBCI; | ||
| 54 | int stackDepth; | ||
| 55 | } | ||
| 56 | private List/*<PatchInfo>*/ patches = new ArrayList(); | ||
| 57 | |||
| 58 | public Label() { | ||
| 59 | } | ||
| 60 | |||
| 61 | void add(ClassFileAssembler asm, | ||
| 62 | short instrBCI, | ||
| 63 | short patchBCI, | ||
| 64 | int stackDepth) | ||
| 65 | { | ||
| 66 | patches.add(new PatchInfo(asm, instrBCI, patchBCI, stackDepth)); | ||
| 67 | } | ||
| 68 | |||
| 69 | public void bind() { | ||
| 70 | for (Iterator iter = patches.iterator(); iter.hasNext(); ) { | ||
| 71 | PatchInfo patch = (PatchInfo) iter.next(); | ||
| 72 | short curBCI = patch.asm.getLength(); | ||
| 73 | short offset = (short) (curBCI - patch.instrBCI); | ||
| 74 | patch.asm.emitShort(patch.patchBCI, offset); | ||
| 75 | patch.asm.setStack(patch.stackDepth); | ||
| 76 | } | ||
| 77 | } | ||
| 78 | } | ||