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annotate test/runtime/8003720/Asmator.java @ 7179:d0aa87f04bd5

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8003720: NPG: Method in interpreter stack frame can be deallocated Summary: Pass down a closure during root scanning to keep the class of the method alive. Reviewed-by: coleenp, jcoomes
author stefank
date Tue, 27 Nov 2012 10:13:20 +0100
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children dad48145e775
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7179
d0aa87f04bd5 8003720: NPG: Method in interpreter stack frame can be deallocated
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1 import com.sun.xml.internal.ws.org.objectweb.asm.*;
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2
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3 class Asmator {
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4 static byte[] fixup(byte[] buf) throws java.io.IOException {
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5 ClassReader cr = new ClassReader(buf);
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6 ClassWriter cw = new ClassWriter(0) {
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7 public MethodVisitor visitMethod(
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8 final int access,
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9 final String name,
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10 final String desc,
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11 final String signature,
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12 final String[] exceptions)
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13 {
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14 MethodVisitor mv = super.visitMethod(access,
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15 name,
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16 desc,
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17 signature,
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18 exceptions);
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19 if (mv == null) return null;
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20 if (name.equals("callme")) {
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21 // make receiver go dead!
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22 mv.visitInsn(Opcodes.ACONST_NULL);
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23 mv.visitVarInsn(Opcodes.ASTORE, 0);
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24 }
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25 return mv;
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26 }
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27 };
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28 cr.accept(cw, 0);
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29 return cw.toByteArray();
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30 }
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31 }