Java Type.FLOAT_TYPE屬性代碼示例

private static Type opType(int opcode) {
  switch (opcode) {
    case Opcodes.IADD:
    case Opcodes.ISUB:
    case Opcodes.IMUL:
    case Opcodes.IDIV:
    case Opcodes.IREM:
    case Opcodes.INEG:
    case Opcodes.ISHL:
    case Opcodes.ISHR:
    case Opcodes.IUSHR:
      return Type.INT_TYPE;
    case Opcodes.LADD:
    case Opcodes.LSUB:
    case Opcodes.LMUL:
    case Opcodes.LDIV:
    case Opcodes.LREM:
    case Opcodes.LNEG:
    case Opcodes.LSHL:
    case Opcodes.LSHR:
    case Opcodes.LUSHR:
      return Type.LONG_TYPE;
    case Opcodes.FADD:
    case Opcodes.FSUB:
    case Opcodes.FMUL:
    case Opcodes.FDIV:
    case Opcodes.FREM:
    case Opcodes.FNEG:
      return Type.FLOAT_TYPE;
    case Opcodes.DADD:
    case Opcodes.DSUB:
    case Opcodes.DMUL:
    case Opcodes.DDIV:
    case Opcodes.DREM:
    case Opcodes.DNEG:
      return Type.DOUBLE_TYPE;
    default:
      throw new Unreachable("Unexpected opcode " + opcode);
  }
}
 

@Override
public void visitVarInsn(final int opcode, final int var) {
    Type type;
    switch (opcode) {
    case Opcodes.LLOAD:
    case Opcodes.LSTORE:
        type = Type.LONG_TYPE;
        break;

    case Opcodes.DLOAD:
    case Opcodes.DSTORE:
        type = Type.DOUBLE_TYPE;
        break;

    case Opcodes.FLOAD:
    case Opcodes.FSTORE:
        type = Type.FLOAT_TYPE;
        break;

    case Opcodes.ILOAD:
    case Opcodes.ISTORE:
        type = Type.INT_TYPE;
        break;

    default:
        // case Opcodes.ALOAD:
        // case Opcodes.ASTORE:
        // case RET:
        type = OBJECT_TYPE;
        break;
    }
    mv.visitVarInsn(opcode, remap(var, type));
}
 

private static Type getArrayElementTypeForOpcode(int opcode) {
  switch (opcode) {
    case Opcodes.IALOAD:
    case Opcodes.IASTORE:
      return Type.INT_TYPE;
    case Opcodes.FALOAD:
    case Opcodes.FASTORE:
      return Type.FLOAT_TYPE;
    case Opcodes.LALOAD:
    case Opcodes.LASTORE:
      return Type.LONG_TYPE;
    case Opcodes.DALOAD:
    case Opcodes.DASTORE:
      return Type.DOUBLE_TYPE;
    case Opcodes.AALOAD:
    case Opcodes.AASTORE:
      return JarState.NULL_TYPE; // We might not know the type.
    case Opcodes.BALOAD:
    case Opcodes.BASTORE:
      return Type.BYTE_TYPE; // We don't distinguish byte and boolean.
    case Opcodes.CALOAD:
    case Opcodes.CASTORE:
      return Type.CHAR_TYPE;
    case Opcodes.SALOAD:
    case Opcodes.SASTORE:
      return Type.SHORT_TYPE;
    default:
      throw new Unreachable("Unexpected array opcode " + opcode);
  }
}
 

public void cast(final Type from, final Type to) {
    if (from != to) {
        if (from == Type.DOUBLE_TYPE) {
            if (to == Type.FLOAT_TYPE) {
                mv.visitInsn(Opcodes.D2F);
            } else if (to == Type.LONG_TYPE) {
                mv.visitInsn(Opcodes.D2L);
            } else {
                mv.visitInsn(Opcodes.D2I);
                cast(Type.INT_TYPE, to);
            }
        } else if (from == Type.FLOAT_TYPE) {
            if (to == Type.DOUBLE_TYPE) {
                mv.visitInsn(Opcodes.F2D);
            } else if (to == Type.LONG_TYPE) {
                mv.visitInsn(Opcodes.F2L);
            } else {
                mv.visitInsn(Opcodes.F2I);
                cast(Type.INT_TYPE, to);
            }
        } else if (from == Type.LONG_TYPE) {
            if (to == Type.DOUBLE_TYPE) {
                mv.visitInsn(Opcodes.L2D);
            } else if (to == Type.FLOAT_TYPE) {
                mv.visitInsn(Opcodes.L2F);
            } else {
                mv.visitInsn(Opcodes.L2I);
                cast(Type.INT_TYPE, to);
            }
        } else {
            if (to == Type.BYTE_TYPE) {
                mv.visitInsn(Opcodes.I2B);
            } else if (to == Type.CHAR_TYPE) {
                mv.visitInsn(Opcodes.I2C);
            } else if (to == Type.DOUBLE_TYPE) {
                mv.visitInsn(Opcodes.I2D);
            } else if (to == Type.FLOAT_TYPE) {
                mv.visitInsn(Opcodes.I2F);
            } else if (to == Type.LONG_TYPE) {
                mv.visitInsn(Opcodes.I2L);
            } else if (to == Type.SHORT_TYPE) {
                mv.visitInsn(Opcodes.I2S);
            }
        }
    }
}
 

/**
 * Generates the instructions to cast a numerical value from one type to
 * another.
 * 
 * @param from
 *            the type of the top stack value
 * @param to
 *            the type into which this value must be cast.
 */
public void cast(final Type from, final Type to) {
    if (from != to) {
        if (from == Type.DOUBLE_TYPE) {
            if (to == Type.FLOAT_TYPE) {
                mv.visitInsn(Opcodes.D2F);
            } else if (to == Type.LONG_TYPE) {
                mv.visitInsn(Opcodes.D2L);
            } else {
                mv.visitInsn(Opcodes.D2I);
                cast(Type.INT_TYPE, to);
            }
        } else if (from == Type.FLOAT_TYPE) {
            if (to == Type.DOUBLE_TYPE) {
                mv.visitInsn(Opcodes.F2D);
            } else if (to == Type.LONG_TYPE) {
                mv.visitInsn(Opcodes.F2L);
            } else {
                mv.visitInsn(Opcodes.F2I);
                cast(Type.INT_TYPE, to);
            }
        } else if (from == Type.LONG_TYPE) {
            if (to == Type.DOUBLE_TYPE) {
                mv.visitInsn(Opcodes.L2D);
            } else if (to == Type.FLOAT_TYPE) {
                mv.visitInsn(Opcodes.L2F);
            } else {
                mv.visitInsn(Opcodes.L2I);
                cast(Type.INT_TYPE, to);
            }
        } else {
            if (to == Type.BYTE_TYPE) {
                mv.visitInsn(Opcodes.I2B);
            } else if (to == Type.CHAR_TYPE) {
                mv.visitInsn(Opcodes.I2C);
            } else if (to == Type.DOUBLE_TYPE) {
                mv.visitInsn(Opcodes.I2D);
            } else if (to == Type.FLOAT_TYPE) {
                mv.visitInsn(Opcodes.I2F);
            } else if (to == Type.LONG_TYPE) {
                mv.visitInsn(Opcodes.I2L);
            } else if (to == Type.SHORT_TYPE) {
                mv.visitInsn(Opcodes.I2S);
            }
        }
    }
}