org.objectweb.asm.MethodVisitor.visitTryCatchBlock java code examples

public void visitTryCatchBlock(Label start, Label end, Label handler, String type) {
  mv1.visitTryCatchBlock(start, end, handler, type);
  mv2.visitTryCatchBlock(start, end, handler, type);
}

public void visitTryCatchBlock(Label start, Label end, Label handler, String type) {
  mv1.visitTryCatchBlock(start, end, handler, type);
  mv2.visitTryCatchBlock(start, end, handler, type);
}

@Override
public void visitMaxs(int maxStack, int maxLocals) {
  Label endFinally = new Label();
  mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
  mv.visitLabel(endFinally);
  mv.visitInsn(DUP);
  int errIdx = newLocal(Type.getType(Throwable.class));
  mv.visitVarInsn(Opcodes.ASTORE, errIdx);
  mv.visitVarInsn(Opcodes.ALOAD, statIdx);
  mv.visitVarInsn(Opcodes.ALOAD, errIdx);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_MAIN, END_METHOD, END_SIGNATURE, false);
  mv.visitInsn(ATHROW);
  mv.visitMaxs(maxStack + 8, maxLocals + 2);
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEAPICALL, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_SQL, END_METHOD, END_SIGNATURE2, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_KAFKA, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);
    mv.visitVarInsn(Opcodes.ALOAD, strArgIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_SQL, CONNECT_METHOD, ERR_SIGNATURE,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);// stat
    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);// throwable
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESUBCALL, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, END_METHOD, END_SIGNATURE,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_RABBIT, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitInsn(Opcodes.ACONST_NULL);// return
    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET, END_METHOD, END_METHOD_DESC,false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

  @Override
  public void visitMaxs(int maxStack, int maxLocals) {
    Label endFinally = new Label();
    mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
    mv.visitLabel(endFinally);
    mv.visitInsn(DUP);
    int errIdx = newLocal(Type.getType(Throwable.class));
    mv.visitVarInsn(Opcodes.ASTORE, errIdx);

    mv.visitVarInsn(Opcodes.ALOAD, statIdx);
    mv.visitVarInsn(Opcodes.ALOAD, errIdx);
    AsmUtil.PUSH(mv, -3);

    mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESQL, END_METHOD, END_SIGNATURE, false);
    mv.visitInsn(ATHROW);
    mv.visitMaxs(maxStack + 8, maxLocals + 2);
  }
}

@Override
public void visitMaxs(int maxStack, int maxLocals) {
  Label endFinally = new Label();
  mv.visitTryCatchBlock(startFinally, endFinally, endFinally, null);
  mv.visitLabel(endFinally);
  mv.visitInsn(DUP);
  int errIdx = newLocal(Type.getType(Throwable.class));
  mv.visitVarInsn(Opcodes.ASTORE, errIdx);
  mv.visitVarInsn(Opcodes.ALOAD, statIdx);
  mv.visitVarInsn(Opcodes.ALOAD, errIdx);
  AsmUtil.PUSH(mv, -3);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACESQL, END_METHOD, END_SIGNATURE,false);
  mv.visitInsn(ATHROW);
  mv.visitMaxs(maxStack + 8, maxLocals + 2);
}

public void catch_exception(Block block, Type exception) {
  if (block.getEnd() == null) {
    throw new IllegalStateException("end of block is unset");
  }
  mv.visitTryCatchBlock(block.getStart(),
             block.getEnd(),
             mark(),
             exception.getInternalName());
}

public void catch_exception(Block block, Type exception) {
  if (block.getEnd() == null) {
    throw new IllegalStateException("end of block is unset");
  }
  mv.visitTryCatchBlock(block.getStart(),
             block.getEnd(),
             mark(),
             exception.getInternalName());
}

/**
 * an empty try-catch block will cause other crash, we check this by finding non-label stmts between
 * {@link Trap#start} and {@link Trap#end}. if find we add the try-catch or we drop the try-catch.
 *
 * @param ir
 * @param asm
 */
private void reBuildTryCatchBlocks(IrMethod ir, MethodVisitor asm) {
  for (Trap trap : ir.traps) {
    boolean needAdd = false;
    for (Stmt p = trap.start.getNext(); p != null && p != trap.end; p = p.getNext()) {
      if (p.st != ST.LABEL) {
        needAdd = true;
        break;
      }
    }
    if (needAdd) {
      for (int i = 0; i < trap.handlers.length; i++) {
        String type = trap.types[i];
        asm.visitTryCatchBlock((Label) trap.start.tag, (Label) trap.end.tag, (Label) trap.handlers[i].tag,
            type == null ? null : toInternal(type));
      }
    }
  }
}

Javadoc

Visits a try catch block.

Popular methods of MethodVisitor

visitMethodInsn
Visits a method instruction. A method instruction is an instruction that invokes a method.
visitInsn
Visits a zero operand instruction.
visitVarInsn
Visits a local variable instruction. A local variable instruction is an instruction that loads or st
visitMaxs
Visits the maximum stack size and the maximum number of local variables of the method.
visitEnd
Visits the end of the method. This method, which is the last one to be called, is used to inform the
visitCode
Starts the visit of the method's code, if any (i.e. non abstract method).
visitFieldInsn
Visits a field instruction. A field instruction is an instruction that loads or stores the value of
visitTypeInsn
Visits a type instruction. A type instruction is an instruction that takes the internal name of a cl
visitLabel
Visits a label. A label designates the instruction that will be visited just after it.
visitLdcInsn
Visits a LDC instruction. Note that new constant types may be added in future versions of the Java V
visitJumpInsn
Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction
visitIntInsn
Visits an instruction with a single int operand.

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How to use visitTryCatchBlockmethodin org.objectweb.asm.MethodVisitor

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How to use
visitTryCatchBlock
method
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org.objectweb.asm.MethodVisitor