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Diffstat (limited to 'tools/external/asm/org/objectweb/asm/tree/analysis/Subroutine.java')
| -rw-r--r-- | tools/external/asm/org/objectweb/asm/tree/analysis/Subroutine.java | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/tools/external/asm/org/objectweb/asm/tree/analysis/Subroutine.java b/tools/external/asm/org/objectweb/asm/tree/analysis/Subroutine.java new file mode 100644 index 000000000..44120a721 --- /dev/null +++ b/tools/external/asm/org/objectweb/asm/tree/analysis/Subroutine.java @@ -0,0 +1,96 @@ +/*** + * ASM: a very small and fast Java bytecode manipulation framework + * Copyright (c) 2000-2005 INRIA, France Telecom + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ +package org.objectweb.asm.tree.analysis; + +import java.util.ArrayList; +import java.util.List; + +import org.objectweb.asm.Label; +import org.objectweb.asm.tree.JumpInsnNode; + +/** + * A method subroutine (corresponds to a JSR instruction). + * + * @author Eric Bruneton + */ +class Subroutine { + + Label start; + + boolean[] access; + + List callers; + + private Subroutine() { + } + + public Subroutine( + final Label start, + final int maxLocals, + final JumpInsnNode caller) + { + this.start = start; + this.access = new boolean[maxLocals]; + this.callers = new ArrayList(); + callers.add(caller); + } + + public Subroutine copy() { + Subroutine result = new Subroutine(); + result.start = start; + result.access = new boolean[access.length]; + System.arraycopy(access, 0, result.access, 0, access.length); + result.callers = new ArrayList(callers); + return result; + } + + public boolean merge(final Subroutine subroutine, boolean checkOverlap) + throws AnalyzerException + { + if (checkOverlap && subroutine.start != start) { + throw new AnalyzerException("Overlapping sub routines"); + } + boolean changes = false; + for (int i = 0; i < access.length; ++i) { + if (subroutine.access[i] && !access[i]) { + access[i] = true; + changes = true; + } + } + for (int i = 0; i < subroutine.callers.size(); ++i) { + Object caller = subroutine.callers.get(i); + if (!callers.contains(caller)) { + callers.add(caller); + changes = true; + } + } + return changes; + } +}
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