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

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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 static void PUSH(MethodVisitor mv, String value) {
  if (value == null)
    mv.visitInsn(ACONST_NULL);
  else
    mv.visitLdcInsn(value);
}

private void visitMethodStub(MethodVisitor mv) {
  mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
  mv.visitInsn(Opcodes.DUP);
  mv.visitLdcInsn("Stub!");
  String owner = "java/lang/RuntimeException";
  String name = "<init>";
  String desc = "(Ljava/lang/String;)V";
  mv.visitMethodInsn(Opcodes.INVOKESPECIAL, owner, name, desc, false);
  mv.visitInsn(Opcodes.ATHROW);
}

private static void writeRelease(MethodVisitor methodVisitor, int wOffset, int type, Class<? extends ProxyChannelRingBuffer> backendType) {
  methodVisitor.visitVarInsn(Opcodes.ALOAD, LOCALS_INDEX_THIS);
  methodVisitor.visitVarInsn(Opcodes.LLOAD, wOffset);
  methodVisitor.visitLdcInsn(type);
  methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(backendType), "writeRelease", "(JI)V", false);
}

case Constants.MONITORENTER:
case Constants.MONITOREXIT:
 methodVisitor.visitInsn(opcode);
 currentOffset += 1;
 break;
 break;
case Constants.LDC:
 methodVisitor.visitLdcInsn(
   readConst(classFileBuffer[currentOffset + 1] & 0xFF, charBuffer));
 currentOffset += 2;
case Constants.LDC_W:
case Constants.LDC2_W:
 methodVisitor.visitLdcInsn(readConst(readUnsignedShort(currentOffset + 1), charBuffer));
 currentOffset += 3;
 break;
   boolean isInterface =
     classFileBuffer[cpInfoOffset - 1] == Symbol.CONSTANT_INTERFACE_METHODREF_TAG;
   methodVisitor.visitMethodInsn(opcode, owner, name, descriptor, isInterface);

  @Override
  public void handleMethodTranslateException(Method method, DexMethodNode methodNode, MethodVisitor mv, Exception e) {
    // replace the generated code with
    // 'return new RuntimeException("D2jFail translate: xxxxxxxxxxxxx");'
    StringWriter s = new StringWriter();
    s.append("d2j fail translate: ");
    e.printStackTrace(new PrintWriter(s));
    String msg = s.toString();
    mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException");
    mv.visitInsn(Opcodes.DUP);
    mv.visitLdcInsn(msg);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(Opcodes.ATHROW);
  }
}

private static void loadLocalIndexAndApplyDelta(MethodVisitor methodVisitor, int localVariableIndex, long delta) {
  methodVisitor.visitVarInsn(Opcodes.LLOAD, localVariableIndex);
  if (delta != 0) {
    methodVisitor.visitLdcInsn(delta);
    methodVisitor.visitInsn(Opcodes.LADD);
  }
}

@Override
public void visitCode() {
  AsmUtil.PUSH(mv, fullname_hash);
  mv.visitLdcInsn(fullname);
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACEMAIN, START_METHOD, START_SIGNATURE, false);
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitCode();
}

  mv.visitLdcInsn(e.getKey());
  mv.visitInsn(ARETURN);
mv.visitInsn(DUP);
mv.visitLdcInsn("invalid idx");
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
mv.visitInsn(ATHROW);
mv.visitMaxs(-1, -1);
mv.visitEnd();

public static void PUSH(MethodVisitor mv, long value) {
  if (value == 0)
    mv.visitInsn(LCONST_0);
  else if (value == 1)
    mv.visitInsn(LCONST_1);
  else
    mv.visitLdcInsn(new Long(value));
  // LDC2_W
}

@Override
public void visitCode() {
  AsmUtil.PUSH(mv, fullname_hash);
  mv.visitLdcInsn(fullname);
  if (isStatic) {
    AsmUtil.PUSHNULL(mv);
  } else {
    mv.visitVarInsn(Opcodes.ALOAD, 0);
  }
  mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_SQL, START_METHOD, START_SIGNATURE, false);
  statIdx = newLocal(Type.getType(Object.class));
  mv.visitVarInsn(Opcodes.ASTORE, statIdx);
  mv.visitLabel(startFinally);
  mv.visitCode();
}

mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitInsn(Opcodes.DUP);
mv.visitVarInsn(Opcodes.ALOAD, 4);
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "com/mysql/jdbc/Buffer", "getByteBuffer", "()[B");
mv.visitLdcInsn("utf-8");
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/String", "<init>", "([BLjava/lang/String;)V");
mv.visitVarInsn(Opcodes.ASTORE, 30);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "com/taobao/profile/Profiler", "start4Mysql", "(Ljava/lang/String;ILjava/lang/String;Ljava/lang/String;)V");
mv.visitCode();

/**
 * @param mv
 * @param value
 */
public static void PUSH(MethodVisitor mv, double value) {
  if (value == 0)
    mv.visitInsn(DCONST_0);
  else if (value == 1)
    mv.visitInsn(DCONST_1);
  else
    mv.visitLdcInsn(new Double(value));
}

private void addCodeForSetTransactionX(MethodVisitor mv, String templateGetterName,
    String threadContextSetterName) {
  mv.visitVarInsn(ALOAD, 0);
  mv.visitVarInsn(ALOAD, 4);
  // methodMetaInternalName is non-null when transactionNameTemplate or
  // transactionUserTemplate are non-empty
  checkNotNull(methodMetaInternalName);
  mv.visitMethodInsn(INVOKEVIRTUAL, methodMetaInternalName, templateGetterName,
      "()Lorg/glowroot/agent/bytecode/api/MessageTemplate;", false);
  mv.visitVarInsn(ALOAD, 1);
  mv.visitVarInsn(ALOAD, 2);
  mv.visitVarInsn(ALOAD, 3);
  mv.visitMethodInsn(INVOKESTATIC, "org/glowroot/agent/bytecode/api/Bytecode",
      "getMessageText",
      "(Lorg/glowroot/agent/bytecode/api/MessageTemplate;Ljava/lang/Object;"
          + "Ljava/lang/String;[Ljava/lang/Object;)"
          + "Ljava/lang/String;",
      false);
  mv.visitLdcInsn(priorityForSetters);
  mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/ThreadContext",
      threadContextSetterName, "(Ljava/lang/String;I)V", true);
}

mv.visitInsn(DUP);
mv.visitLdcInsn("A method was invoked on a dummy class, due to the static field %s not being initialized "
    + "(most likely in a CatalogType-related class).\n"
    + "Method: " + method);
mv.visitLdcInsn(1);
mv.visitTypeInsn(ANEWARRAY, "java/lang/String");
mv.visitLdcInsn(0);
mv.visitInsn(AASTORE);
mv.visitMethodInsn(INVOKESTATIC, Type.getInternalName(String.class), "format",
  "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;", false);
mv.visitMethodInsn(INVOKESPECIAL, internalException, "<init>", "(Ljava/lang/String;)V", false);
mv.visitInsn(ATHROW);
mv.visitMaxs(0, 0);
mv.visitEnd();

public static void PUSH(MethodVisitor mv, float value) {
  if (value == 0.0)
    mv.visitInsn(FCONST_0);
  else if (value == 1.0)
    mv.visitInsn(FCONST_1);
  else if (value == 2.0)
    mv.visitInsn(FCONST_2);
  else
    mv.visitLdcInsn(new Float(value));
}

private static void loadArrayType(MethodVisitor mv, Type type, Type ownerType) {
  loadType(mv, type.getElementType(), ownerType);
  mv.visitLdcInsn(type.getDimensions());
  mv.visitMethodInsn(INVOKESTATIC, bytecodeUtilType.getInternalName(),
      "getArrayClass", "(Ljava/lang/Class;I)Ljava/lang/Class;", false);
}

mv.visitInsn(DUP);
if (hasThis) {
  mv.visitVarInsn(ALOAD, 0);
  start = 1;
} else {
  mv.visitInsn(ACONST_NULL);
  start = 0;
  mv.visitInsn(ACONST_NULL);
} else {
  mv.visitLdcInsn(args.length);
  mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
  for (int i = 0; i < args.length; i++) {
    mv.visitInsn(DUP);
    mv.visitLdcInsn(i);
    mv.visitVarInsn(args[i].getOpcode(ILOAD), i + start);
    box(args[i], mv);
mv.visitLdcInsn(nextIdx);
mv.visitMethodInsn(INVOKESPECIAL, getCurrentInvocationName(), "<init>",
    "(Ljava/lang/Object;[Ljava/lang/Object;I)V");
mv.visitMethodInsn(INVOKESTATIC, toInternal(mapTo.owner), mapTo.name, mapTo.desc);
unBox(ret, Type.getReturnType(mapTo.desc), mv);
mv.visitInsn(ret.getOpcode(IRETURN));

public void push(float value) {
  if (value == 0f || value == 1f || value == 2f) {
    mv.visitInsn(TypeUtils.FCONST(value));
  } else {
    mv.visitLdcInsn(new Float(value));
  }
}
public void push(double value) {

private void addCodeForOptionalTransactionAttributes(MethodVisitor mv) {
  if (!config.transactionType().isEmpty() && !config.isTransaction()) {
    mv.visitVarInsn(ALOAD, 0);
    mv.visitLdcInsn(config.transactionType());
    mv.visitLdcInsn(priorityForSetters);
    mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/ThreadContext",
        "setTransactionType", "(Ljava/lang/String;I)V", true);
  for (String attrName : config.transactionAttributeTemplates().keySet()) {
    mv.visitVarInsn(ALOAD, 0);
    mv.visitLdcInsn(attrName);
    mv.visitVarInsn(ALOAD, 4);
    mv.visitMethodInsn(INVOKEVIRTUAL, methodMetaInternalName,
        "getTransactionAttributeTemplate" + i++,
        "()Lorg/glowroot/agent/bytecode/api/MessageTemplate;", false);
  if (slowThresholdMillis != null) {
    mv.visitVarInsn(ALOAD, 0);
    mv.visitLdcInsn(slowThresholdMillis.longValue());
    mv.visitFieldInsn(GETSTATIC, "java/util/concurrent/TimeUnit", "MILLISECONDS",
        "Ljava/util/concurrent/TimeUnit;");
    mv.visitLdcInsn(priorityForSetters);
    mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/ThreadContext",
        "setTransactionSlowThreshold", "(JLjava/util/concurrent/TimeUnit;I)V", true);

  mv.visitLdcInsn(i);
  mv.visitInsn(AALOAD);
  unBox(args[i], OBJECT_TYPE, mv);
mv.visitMethodInsn(opcode, toInternal(t.owner), t.name, t.desc);
Type ret = Type.getReturnType(t.desc);
box(ret, mv);
mv.visitInsn(ARETURN);
mv.visitMaxs(-1, -1);
mv.visitEnd();

Javadoc

Visits a LDC instruction. Note that new constant types may be added in future versions of the Java Virtual Machine. To easily detect new constant types, implementations of this method should check for unexpected constant types, like this:

 
if (cst instanceof Integer) { 
// ... 
} else if (cst instanceof Float) { 
// ... 
} else if (cst instanceof Long) { 
// ... 
} else if (cst instanceof Double) { 
// ... 
} else if (cst instanceof String) { 
// ... 
} else if (cst instanceof Type) { 
int sort = ((Type) cst).getSort(); 
if (sort == Type.OBJECT) { 
// ... 
} else if (sort == Type.ARRAY) { 
// ... 
} else if (sort == Type.METHOD) { 
// ... 
} else { 
// throw an exception 
} 
} else if (cst instanceof Handle) { 
// ... 
} else { 
// throw an exception 
}

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.
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.
visitLocalVariable
Visits a local variable declaration.

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How to use visitLdcInsnmethodin org.objectweb.asm.MethodVisitor

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visitLdcInsn
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org.objectweb.asm.MethodVisitor