org.objectweb.asm.tree.analysis.BasicInterpreter Java Examples

The following examples show how to use org.objectweb.asm.tree.analysis.BasicInterpreter. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: MethodUtils.java From JByteMod-Beta with GNU General Public License v2.0

6 votes

@SuppressWarnings({ "rawtypes", "unchecked" })
public static void removeDeadCode(ClassNode cn, MethodNode mn) {
  Analyzer analyzer = new Analyzer(new BasicInterpreter());
  try {
    analyzer.analyze(cn.name, mn);
  } catch (AnalyzerException e) {
    ErrorDisplay.error("Could not analyze the code: " + e.getMessage());
    return;
  }
  Frame[] frames = analyzer.getFrames();
  AbstractInsnNode[] insns = mn.instructions.toArray();
  for (int i = 0; i < frames.length; i++) {
    AbstractInsnNode insn = insns[i];
    if (frames[i] == null && insn.getType() != AbstractInsnNode.LABEL) {
      mn.instructions.remove(insn);
      insns[i] = null;
    }
  }
}

Example #2

Source File: ConstructorThisInterpreter.java From AVM with MIT License

4 votes

public ConstructorThisInterpreter() {
    super(Opcodes.ASM6);
    this.underlying = new BasicInterpreter();
    // NOTE:  This is based on the assumption that a non-static method's first newValue() call is for "this".
    this.isNextThis = true;
}

Example #3

Source File: InsnFinder.java From Mixin with MIT License

4 votes

public PopAnalyzer(AbstractInsnNode node) {
    super(new BasicInterpreter());
    this.node = node;
}

Example #4

Source File: ClassVisitorExample.java From grappa with Apache License 2.0

4 votes

@Override
public MethodVisitor visitMethod(final int access, final String name,
    final String desc, final String signature, final String[] exceptions)
{
    // Unused?
    /*
    final MethodVisitor mv = super.visitMethod(access, name, desc,
        signature, exceptions);
    */

    return new MethodNode(Opcodes.ASM5, access, name, desc, signature,
        exceptions)
    {
        @Override
        public void visitEnd()
        {
            super.visitEnd();

            try {
                final BasicInterpreter basicInterpreter
                    = new BasicInterpreter();
                final Analyzer<BasicValue> analyzer
                    = new Analyzer<>(basicInterpreter);
                final AbstractInsnNode[] nodes = instructions.toArray();
                final Frame<BasicValue>[] frames
                    = analyzer.analyze(className, this);
                int areturn = -1;
                for (int i = nodes.length -1; i >= 0; i--)
                {
                    if (nodes[i].getOpcode() == Opcodes.ARETURN) {
                        areturn = i;
                        System.out.println(className + "." + name + desc);
                        System.out.println("Found areturn at: " + i);
                    } else if (areturn != -1
                        && nodes[i].getOpcode() != -1
                        && frames[i].getStackSize() == 0) {
                        System.out.println("Found start of block at: " + i);

                        final InsnList list = new InsnList();
                        for (int j = i; j <= areturn; j++)
                            list.add(nodes[j]);
                        final Textifier textifier = new Textifier();
                        final PrintWriter pw = new PrintWriter(System.out);
                        list.accept(new TraceMethodVisitor(textifier));
                        textifier.print(pw);
                        pw.flush();
                        System.out.println("\n\n");
                        areturn = -1;
                    }
                }
            }
            catch (AnalyzerException e) {
                e.printStackTrace();
            }

            if (mv != null)
                accept(mv);
        }
    };
}