/** Returns the constant string at the specified offset */
  public static String get_constant_str(ConstantPool pool, int index) {

    Constant c = pool.getConstant(index);
    if (c instanceof ConstantUtf8) return ((ConstantUtf8) c).getBytes();
    else if (c instanceof ConstantClass) {
      ConstantClass cc = (ConstantClass) c;
      return cc.getBytes(pool) + " [" + cc.getNameIndex() + "]";
    } else assert false : "unexpected constant " + c + " class " + c.getClass();
    return (null);
  }
Exemplo n.º 2
0
  /**
   * Adds all the constants found in the given class into the given ConstantSet, and returns it.
   *
   * @see #getConstants(String)
   */
  public static ConstantSet getConstants(String classname, ConstantSet result) {

    ClassParser cp;
    JavaClass jc;
    try {
      String classfileBase = classname.replace('.', '/');
      InputStream is = ClassPath.SYSTEM_CLASS_PATH.getInputStream(classfileBase, ".class");
      cp = new ClassParser(is, classname);
      jc = cp.parse();
    } catch (java.io.IOException e) {
      throw new Error("IOException while reading '" + classname + "': " + e.getMessage());
    }
    result.classname = jc.getClassName();

    // Get all of the constants from the pool
    ConstantPool constant_pool = jc.getConstantPool();
    for (Constant c : constant_pool.getConstantPool()) {
      // System.out.printf ("*Constant = %s%n", c);
      if (c == null
          || c instanceof ConstantClass
          || c instanceof ConstantFieldref
          || c instanceof ConstantInterfaceMethodref
          || c instanceof ConstantMethodref
          || c instanceof ConstantNameAndType
          || c instanceof ConstantUtf8) {
        continue;
      }
      if (c instanceof ConstantString) {
        result.strings.add((String) ((ConstantString) c).getConstantValue(constant_pool));
      } else if (c instanceof ConstantDouble) {
        result.doubles.add((Double) ((ConstantDouble) c).getConstantValue(constant_pool));
      } else if (c instanceof ConstantFloat) {
        result.floats.add((Float) ((ConstantFloat) c).getConstantValue(constant_pool));
      } else if (c instanceof ConstantInteger) {
        result.ints.add((Integer) ((ConstantInteger) c).getConstantValue(constant_pool));
      } else if (c instanceof ConstantLong) {
        result.longs.add((Long) ((ConstantLong) c).getConstantValue(constant_pool));
      } else {
        throw new RuntimeException("Unrecognized constant of type " + c.getClass() + ": " + c);
      }
    }

    ClassGen gen = new ClassGen(jc);
    ConstantPoolGen pool = gen.getConstantPool();

    // Process the code in each method looking for literals
    for (Method m : jc.getMethods()) {
      MethodGen mg = new MethodGen(m, jc.getClassName(), pool);
      InstructionList il = mg.getInstructionList();
      if (il == null) {
        // System.out.println("No instructions for " + mg);
      } else {
        for (Instruction inst : il.getInstructions()) {
          switch (inst.getOpcode()) {

              // Compare two objects, no literals
            case Constants.IF_ACMPEQ:
            case Constants.IF_ACMPNE:
              break;

              // These instructions compare the integer on the top of the stack
              // to zero.  There are no literals here (except 0)
            case Constants.IFEQ:
            case Constants.IFNE:
            case Constants.IFLT:
            case Constants.IFGE:
            case Constants.IFGT:
            case Constants.IFLE:
              {
                break;
              }

              // Instanceof pushes either 0 or 1 on the stack depending on whether
              // the object on top of stack is of the specified type.
              // If were interested in class literals, this would be interesting
            case Constants.INSTANCEOF:
              break;

              // Duplicates the item on the top of stack.  No literal.
            case Constants.DUP:
              {
                break;
              }

              // Duplicates the item on the top of the stack and inserts it 2
              // values down in the stack.  No literals
            case Constants.DUP_X1:
              {
                break;
              }

              // Duplicates either the top 2 category 1 values or a single
              // category 2 value and inserts it 2 or 3 values down on the
              // stack.
            case Constants.DUP2_X1:
              {
                break;
              }

              // Duplicate either one category 2 value or two category 1 values.
            case Constants.DUP2:
              {
                break;
              }

              // Dup the category 1 value on the top of the stack and insert it either
              // two or three values down on the stack.
            case Constants.DUP_X2:
              {
                break;
              }

            case Constants.DUP2_X2:
              {
                break;
              }

              // Pop instructions discard the top of the stack.
            case Constants.POP:
              {
                break;
              }

              // Pops either the top 2 category 1 values or a single category 2 value
              // from the top of the stack.
            case Constants.POP2:
              {
                break;
              }

              // Swaps the two category 1 types on the top of the stack.
            case Constants.SWAP:
              {
                break;
              }

              // Compares two integers on the stack
            case Constants.IF_ICMPEQ:
            case Constants.IF_ICMPGE:
            case Constants.IF_ICMPGT:
            case Constants.IF_ICMPLE:
            case Constants.IF_ICMPLT:
            case Constants.IF_ICMPNE:
              {
                break;
              }

              // Get the value of a field
            case Constants.GETFIELD:
              {
                break;
              }

              // stores the top of stack into a field
            case Constants.PUTFIELD:
              {
                break;
              }

              // Pushes the value of a static field on the stack
            case Constants.GETSTATIC:
              {
                break;
              }

              // Pops a value off of the stack into a static field
            case Constants.PUTSTATIC:
              {
                break;
              }

              // pushes a local onto the stack
            case Constants.DLOAD:
            case Constants.DLOAD_0:
            case Constants.DLOAD_1:
            case Constants.DLOAD_2:
            case Constants.DLOAD_3:
            case Constants.FLOAD:
            case Constants.FLOAD_0:
            case Constants.FLOAD_1:
            case Constants.FLOAD_2:
            case Constants.FLOAD_3:
            case Constants.ILOAD:
            case Constants.ILOAD_0:
            case Constants.ILOAD_1:
            case Constants.ILOAD_2:
            case Constants.ILOAD_3:
            case Constants.LLOAD:
            case Constants.LLOAD_0:
            case Constants.LLOAD_1:
            case Constants.LLOAD_2:
            case Constants.LLOAD_3:
              {
                break;
              }

              // Pops a value off of the stack into a local
            case Constants.DSTORE:
            case Constants.DSTORE_0:
            case Constants.DSTORE_1:
            case Constants.DSTORE_2:
            case Constants.DSTORE_3:
            case Constants.FSTORE:
            case Constants.FSTORE_0:
            case Constants.FSTORE_1:
            case Constants.FSTORE_2:
            case Constants.FSTORE_3:
            case Constants.ISTORE:
            case Constants.ISTORE_0:
            case Constants.ISTORE_1:
            case Constants.ISTORE_2:
            case Constants.ISTORE_3:
            case Constants.LSTORE:
            case Constants.LSTORE_0:
            case Constants.LSTORE_1:
            case Constants.LSTORE_2:
            case Constants.LSTORE_3:
              {
                break;
              }

              // Push a value from the runtime constant pool.  We'll get these
              // values when processing the constant pool itself
            case Constants.LDC:
            case Constants.LDC_W:
            case Constants.LDC2_W:
              {
                break;
              }

              // Push the length of an array on the stack
            case Constants.ARRAYLENGTH:
              {
                break;
              }

              // Push small constants (-1..5) on the stack.  These literals are
              // too common to bother mentioning
            case Constants.DCONST_0:
            case Constants.DCONST_1:
            case Constants.FCONST_0:
            case Constants.FCONST_1:
            case Constants.FCONST_2:
            case Constants.ICONST_0:
            case Constants.ICONST_1:
            case Constants.ICONST_2:
            case Constants.ICONST_3:
            case Constants.ICONST_4:
            case Constants.ICONST_5:
            case Constants.ICONST_M1:
            case Constants.LCONST_0:
            case Constants.LCONST_1:
              {
                break;
              }

            case Constants.BIPUSH:
            case Constants.SIPUSH:
              {
                ConstantPushInstruction cpi = (ConstantPushInstruction) inst;
                result.ints.add((Integer) cpi.getValue());
                break;
              }

              // Primitive Binary operators.
            case Constants.DADD:
            case Constants.DCMPG:
            case Constants.DCMPL:
            case Constants.DDIV:
            case Constants.DMUL:
            case Constants.DREM:
            case Constants.DSUB:
            case Constants.FADD:
            case Constants.FCMPG:
            case Constants.FCMPL:
            case Constants.FDIV:
            case Constants.FMUL:
            case Constants.FREM:
            case Constants.FSUB:
            case Constants.IADD:
            case Constants.IAND:
            case Constants.IDIV:
            case Constants.IMUL:
            case Constants.IOR:
            case Constants.IREM:
            case Constants.ISHL:
            case Constants.ISHR:
            case Constants.ISUB:
            case Constants.IUSHR:
            case Constants.IXOR:
            case Constants.LADD:
            case Constants.LAND:
            case Constants.LCMP:
            case Constants.LDIV:
            case Constants.LMUL:
            case Constants.LOR:
            case Constants.LREM:
            case Constants.LSHL:
            case Constants.LSHR:
            case Constants.LSUB:
            case Constants.LUSHR:
            case Constants.LXOR:
              break;

            case Constants.LOOKUPSWITCH:
            case Constants.TABLESWITCH:
              break;

            case Constants.ANEWARRAY:
            case Constants.NEWARRAY:
              {
                break;
              }

            case Constants.MULTIANEWARRAY:
              {
                break;
              }

              // push the value at an index in an array
            case Constants.AALOAD:
            case Constants.BALOAD:
            case Constants.CALOAD:
            case Constants.DALOAD:
            case Constants.FALOAD:
            case Constants.IALOAD:
            case Constants.LALOAD:
            case Constants.SALOAD:
              {
                break;
              }

              // Pop the top of stack into an array location
            case Constants.AASTORE:
            case Constants.BASTORE:
            case Constants.CASTORE:
            case Constants.DASTORE:
            case Constants.FASTORE:
            case Constants.IASTORE:
            case Constants.LASTORE:
            case Constants.SASTORE:
              break;

            case Constants.ARETURN:
            case Constants.DRETURN:
            case Constants.FRETURN:
            case Constants.IRETURN:
            case Constants.LRETURN:
            case Constants.RETURN:
              {
                break;
              }

              // subroutine calls.
            case Constants.INVOKESTATIC:
            case Constants.INVOKEVIRTUAL:
            case Constants.INVOKESPECIAL:
            case Constants.INVOKEINTERFACE:
              break;

              // Throws an exception.
            case Constants.ATHROW:
              break;

              // Opcodes that don't need any modifications.  Here for reference
            case Constants.ACONST_NULL:
            case Constants.ALOAD:
            case Constants.ALOAD_0:
            case Constants.ALOAD_1:
            case Constants.ALOAD_2:
            case Constants.ALOAD_3:
            case Constants.ASTORE:
            case Constants.ASTORE_0:
            case Constants.ASTORE_1:
            case Constants.ASTORE_2:
            case Constants.ASTORE_3:
            case Constants.CHECKCAST:
            case Constants.D2F: // double to float
            case Constants.D2I: // double to integer
            case Constants.D2L: // double to long
            case Constants.DNEG: // Negate double on top of stack
            case Constants.F2D: // float to double
            case Constants.F2I: // float to integer
            case Constants.F2L: // float to long
            case Constants.FNEG: // Negate float on top of stack
            case Constants.GOTO:
            case Constants.GOTO_W:
            case Constants.I2B: // integer to byte
            case Constants.I2C: // integer to char
            case Constants.I2D: // integer to double
            case Constants.I2F: // integer to float
            case Constants.I2L: // integer to long
            case Constants.I2S: // integer to short
            case Constants.IFNONNULL:
            case Constants.IFNULL:
            case Constants.IINC: // increment local variable by a constant
            case Constants.INEG: // negate integer on top of stack
            case Constants.JSR: // pushes return address on the stack,
            case Constants.JSR_W:
            case Constants.L2D: // long to double
            case Constants.L2F: // long to float
            case Constants.L2I: // long to int
            case Constants.LNEG: // negate long on top of stack
            case Constants.MONITORENTER:
            case Constants.MONITOREXIT:
            case Constants.NEW:
            case Constants.NOP:
            case Constants.RET: // this is the internal JSR return
              break;

              // Make sure we didn't miss anything
            default:
              throw new Error("instruction " + inst + " unsupported");
          }
        }
      }
    }
    return result;
  }