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

Common ways to obtain MethodVisitor

private void myMethod () {
 MethodVisitor m =ClassVisitor zuper;zuper.visitMethod(access, name, desc, signature, exceptions)
ClassVisitor cv;String name;String desc;String signature;String[] exceptions;cv.visitMethod(access, name, desc, signature, exceptions)
ClassVisitor cv;cv.visitMethod(access, "<init>", "()V", null, null)
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}

public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
  mv1.visitFrame(type, nLocal, local, nStack, stack);
  mv2.visitFrame(type, nLocal, local, nStack, stack);
}

public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
  mv1.visitFrame(type, nLocal, local, nStack, stack);
  mv2.visitFrame(type, nLocal, local, nStack, stack);
}

 final Object[] stack) {
if (mv != null) {
 mv.visitFrame(type, numLocal, local, numStack, stack);

  mv.visitLabel(labels[i]);
  if (i == 0) {
    mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] { classNameInternal }, 0, null);
  } else {
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);

  mv.visitLabel(labels[i]);
  if (i == 0) {
    mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] { classNameInternal }, 0, null);
  } else {
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);

@Override
public void visitFrame(int type, int nLocal, Object/*@Nullable*/[] local, int nStack,
    Object/*@Nullable*/[] stack) {
  if (!skipNextFrame) {
    super.visitFrame(type, nLocal, local, nStack, stack);
  }
  skipNextFrame = true;
}

@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
 for (int i = 0, j = local.length; i < j; i++) {
  if (local[i] instanceof String) {
   local[i] = processInternalName(sourceType, (String) local[i]);
  }
 }
 for (int i = 0, j = stack.length; i < j; i++) {
  if (stack[i] instanceof String) {
   stack[i] = processInternalName(sourceType, (String) stack[i]);
  }
 }
 super.visitFrame(type, nLocal, local, nStack, stack);
}

methodVisitor.visitFrame(Opcodes.F_NEW, maxLocals, null, 0, null);
   methodVisitor.visitFrame(
     Opcodes.F_NEW,
     context.currentFrameLocalCount,
     context.currentFrameStackTypes);
  } else {
   methodVisitor.visitFrame(
     context.currentFrameType,
     context.currentFrameLocalCountDelta,
  methodVisitor.visitFrame(Constants.F_INSERT, 0, null, 0, null);

@Test
public void shouldForwardVisitFrameCallsToChild() {
 final Object[] f1 = { 1, 2, 3 };
 final Object[] f2 = { 2, 4, 6 };
 getTesteeVisitor().visitFrame(1, 2, f1, 3, f2);
 verify(this.mv).visitFrame(1, 2, f1, 3, f2);
}

@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
  if (local != null) {
    for (int index = 0; index < local.length; ++index) {
      if (local[index] instanceof String) {
        local[index] = applyMapping((String) local[index]);
      }
    }
  }
  mv.visitFrame(type, nLocal, local, nStack, stack);
}

public void accept(final MethodVisitor mv) {
  if (locals != null) {
    mv.visitFrame(Opcodes.F_NEW, locals.length, locals, stack.length,
        stack);
  }
}

@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
  if (local.length > 0 && oldOwner.getInternalName().equals(local[0]))
    local[0] = owner;
  super.visitFrame(type, nLocal, local, nStack, stack);
}

@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
  if (local.length > 0 && oldOwner.getInternalName().equals(local[0]))
    local[0] = owner;
  super.visitFrame(type, nLocal, local, nStack, stack);
}

@Override
public void visitFrame(final int type, final int nLocal,
  final Object[] local, final int nStack, final Object[] stack) {
 fsmCursor.transition("visitFrame");
 super.visitFrame(type, nLocal, local, nStack, stack);
}

private void falseIfDifferentClassNames(MethodVisitor mv) {
  Label endif = new Label();
  mv.visitVarInsn(Opcodes.ALOAD, 0);
  mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;");
  mv.visitVarInsn(Opcodes.ALOAD, 1);
  mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;");
  mv.visitJumpInsn(Opcodes.IF_ACMPEQ, endif); // this.class != other.class
  mv.visitInsn(Opcodes.ICONST_0);// false
  mv.visitInsn(Opcodes.IRETURN);
  mv.visitLabel(endif);
  mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
}

  private void visitFullFrame() {
    String currentClz = asmMethod.currentClz.replace('.', '/');
    List<Object> argTypes = AsmUtils.getImplicitFrame(
        asmMethod.desc.substring(asmMethod.desc.indexOf("(") + 1, asmMethod.desc.indexOf(")")));
    List<Object> list = new ArrayList<Object>();
    list.add(currentClz);
    list.addAll(argTypes);
    list.add("org/yx/common/AopExcutor");
    Object[] frames = list.toArray(new Object[list.size()]);
    mv.visitFrame(Opcodes.F_FULL, frames.length, frames, 1, new Object[] { "java/lang/Throwable" });
  }
}

@Override
public void visitFrame(final int type, final int nLocal,
    final Object[] local, final int nStack, final Object[] stack) {
  p.visitFrame(type, nLocal, local, nStack, stack);
  super.visitFrame(type, nLocal, local, nStack, stack);
}

@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack, Object[] stack) {
  Log.logEach("visitFrame", type, local, nLocal, nStack, stack);
  super.visitFrame(type, nLocal, local, nStack, stack);
}

@Override
public void visitFrame(int type, int nLocal, Object[] local, int nStack,
    Object[] stack) {
  super.visitFrame(type, nLocal, remapEntries(nLocal, local), nStack,
      remapEntries(nStack, stack));
}

@Override
public void visitFrame(int arg0, int arg1, Object[] arg2, int arg3,
    Object[] arg4) {
  super.visitFrame(arg0, arg1, arg2, arg3, arg4);
  appendToBacklog(new FrameNode(arg0, arg1, arg2, arg3, arg4));
}

Javadoc

Visits the current state of the local variables and operand stack elements. This method must(*) be called just before any instruction i that follows an unconditional branch instruction such as GOTO or THROW, that is the target of a jump instruction, or that starts an exception handler block. The visited types must describe the values of the local variables and of the operand stack elements just before i is executed.

(*) this is mandatory only for classes whose version is greater than or equal to Opcodes#V1_6.

The frames of a method must be given either in expanded form, or in compressed form (all frames must use the same format, i.e. you must not mix expanded and compressed frames within a single method):

In expanded form, all frames must have the F_NEW type.
In compressed form, frames are basically "deltas" from the state of the previous frame:
- Opcodes#F_SAME representing frame with exactly the same locals as the previous frame and with the empty stack.
- Opcodes#F_SAME1 representing frame with exactly the same locals as the previous frame and with single value on the stack ( nStack is 1 and stack[0] contains value for the type of the stack item).
- Opcodes#F_APPEND representing frame with current locals are the same as the locals in the previous frame, except that additional locals are defined (nLocal is 1, 2 or 3 and local elements contains values representing added types).
- Opcodes#F_CHOP representing frame with current locals are the same as the locals in the previous frame, except that the last 1-3 locals are absent and with the empty stack (nLocals is 1, 2 or 3).
- Opcodes#F_FULL representing complete frame data.

In both cases the first frame, corresponding to the method's parameters and access flags, is implicit and must not be visited. Also, it is illegal to visit two or more frames for the same code location (i.e., at least one instruction must be visited between two calls to visitFrame).

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 visitFramemethodin org.objectweb.asm.MethodVisitor

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visitFrame
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org.objectweb.asm.MethodVisitor