예제 #1
0
  /**
   * Create code for the work function of a built-in filter.
   *
   * @param filter The filter that the work function is being built for
   * @param selfID A unique id assigned in FlatIRToC
   * @param p A printer to output the generated code
   */
  static void predefinedFilterWork(SIRPredefinedFilter filter, int selfID, CodegenPrintWriter p) {

    Tape inputTape = RegisterStreams.getFilterInStream(filter);
    Tape outputTape = RegisterStreams.getFilterOutStream(filter);

    // Caller has printed function name and an iteration parameter ____n
    // Generate loop to execute body of this function ____n times,
    // In loop generate specialized code for function.
    p.print("void " + ClusterUtils.getWorkName(filter, selfID) + "(int ____n) {");
    p.indent();
    p.newLine();
    p.indent();
    //        p.println("// predefinedFilterWork " + filter.getName());

    // SIRFileReader
    if (filter instanceof SIRFileReader) {
      if (!(KjcOptions.mencoder || KjcOptions.blender)) {
        genFileReaderWork((SIRFileReader) filter, outputTape, selfID, p);
      }
      // SIRFileWriter
    } else if (filter instanceof SIRFileWriter) {
      if (!(KjcOptions.mencoder || KjcOptions.blender)) {
        genFileWriterWork((SIRFileWriter) filter, inputTape, selfID, p);
      }
      // SIRIdentity
    } else if (filter instanceof SIRIdentity) {
      assert false : "should not process SIRIdentity here";
      p.println("for (; 0 < ____n; ____n--) {");
      p.indent();
      p.println("  " + outputTape.getPushName() + "(" + inputTape.getPopName() + "());");
      p.outdent();
      p.print("}"); // end of for loop.
    } else if (filter instanceof SIRDummySink || filter instanceof SIRDummySource) {
      // DummySource and SummySink do not appear in any of our
      // application code.  Are they part of the language?
      // TODO: get right exception for unimplemented.
      throw new Error("Unsupported predefined filter " + filter.getName());
    } else {
      // TODO: get right unchecked exception for unextended code...
      throw new Error("Unknown predefined filter " + filter.getName());
    }
    p.newLine();
    p.outdent(); // end of method body
    p.outdent(); // end of method definition
    p.print("}");
    p.newLine();
    p.newLine();
  }
예제 #2
0
  /*
   * There is special case code for FileReader<bit> since individual
   * bits can not be read in by any system routine that I know.
   *
   * With most bit streams that I (A.D.) have seen, the order is
   * little-endian in words, low-to-high bit in bytes.
   * This code -- matching Matt's implementation for the library
   * is a bit odd: endian-ness depends on fread / fwrite -- my
   * laziness, should always be little-endian -- but bits are read
   * and written from high to low.  So byte 0b10011111
   * is read as 1, 0, 0, 1, 1, 1, 1, 1 and is written back as
   * 0b10011111.  This looks a little odd if a bit stream does not
   * end on a byte boundary: writing stream 1,0,1,1 results in 0b10110000
   *
   * If we change the number of bits bufferred from 1 byte to a larger
   * integer type, we will have to worry about endian-ness on disk.
   * This code was designed for .BMP files, which are little-endian.
   * on disk.  We will also have to worry about file lengths: Unix allows
   * file lengths in bytes, this will involve some extra code for not writing
   * an excessive number of bytes on the last write, causing the file lengths
   * to be dependent on the size of 'bits_type'.
   **/
  private static void genFileReaderWorkBit(
      SIRFileReader filter, Tape outputTape, int selfID, CodegenPrintWriter p) {

    // haven't bothered to do buffered file input on top of the
    // bit input (it is possible but seems a little complicated)
    System.err.println(
        "PERFORMANCE WARNING:  FileReader<bit> reads only 1 byte"
            + "  at a time; faster to use FileReader<int>, which is buffered.");

    // String theType = "" + filter.getOutputType();
    // wrap in loop
    p.println("for (; 0 < ____n; ____n--) {");
    p.indent();

    // the bit type is special since you can not just read or
    // write a bit.  It requires bufferring in some larger
    // integer type.
    String bits_to_go = bitsToGoName(filter);
    String the_bits = theBitsName(filter);

    p.println("static " + bits_type + " " + the_bits + " = 0;");
    p.println("static int " + bits_to_go + " = 0;");
    p.newline();
    p.println("if (" + bits_to_go + " == 0) {");
    p.indent();
    p.println(
        "if (fread("
            + "&"
            + the_bits
            + ", "
            + "sizeof("
            + the_bits
            + "),"
            + " "
            + "1, "
            + fpName(filter)
            + ")) {");
    p.indent();
    p.println(bits_to_go + " = 8 * sizeof(" + the_bits + ");");
    // identical to code fragment below ///////////////////////
    p.println(
        outputTape.getPushName()
            + "(("
            + the_bits
            + " & (1 << (sizeof("
            + the_bits
            + ") * 8 - 1))) ? 1 : 0);");
    p.println(the_bits + " <<= 1;");
    p.println(bits_to_go + "--;");
    // end identical to code fragment below ////////////////////
    p.outdent();
    p.println("}");
    p.outdent();
    p.println("} else {");
    p.indent();
    // identical to code fragment above /////////////////////////
    p.println(
        outputTape.getPushName()
            + "(("
            + the_bits
            + " & (1 << (sizeof("
            + the_bits
            + ") * 8 - 1))) ? 1 : 0);");
    p.println(the_bits + " <<= 1;");
    p.println(bits_to_go + "--;");
    // end identical to code fragment above /////////////////////
    p.outdent();
    p.println("}");

    // close loop
    p.outdent();
    p.print("}"); // end of for loop.
  }
예제 #3
0
  /*
   * File reader code currently works by using fread.
   *
   * The File* is declared outside any function / method.
   *
   * This code follows the model in the library of stalling (not pushing)
   * at end of file (detected by fread returning 0).
   *
   */
  private static void genFileReaderWork(
      SIRFileReader filter, Tape outputTape, int selfID, CodegenPrintWriter p) {

    if (KjcOptions.asciifileio) {
      System.err.println("Error: -asciifileio not supported in cluster backend.");
      System.err.println("Exiting...");
      System.exit(1);
    }

    String theType = "" + filter.getOutputType();
    // dispatch to special routine for bit type
    if (theType.equals("bit")) {
      genFileReaderWorkBit(filter, outputTape, selfID, p);
      return;
    }

    // get source and destination ids of outgoing tape
    Tape out = RegisterStreams.getFilterOutStream(filter);
    int s = out.getSource();
    int d = out.getDest();

    // template code to generate, using symbolic free vars above.
    StringBuilder sb = new StringBuilder();
    sb.append("\n  int __index;\n");
    sb.append("  for (__index=0; __index < ____n; __index++) {\n");
    if (KjcOptions.compressed) {
      sb.append("    unsigned char __temp = 0;\n");
      sb.append("    FileReader_read(__file_descr__");
      sb.append(selfID);
      sb.append(", &__temp, 1);\n");
      sb.append("    PUSH(__temp);\n");
      sb.append("    unsigned int __frame_size = __temp;\n");

      sb.append("    FileReader_read(__file_descr__");
      sb.append(selfID);
      sb.append(", &__temp, 1);\n");
      sb.append("    PUSH(__temp);\n");
      sb.append("    __frame_size <<= 8;\n");
      sb.append("    __frame_size += __temp;\n");

      sb.append("    FileReader_read(__file_descr__");
      sb.append(selfID);
      sb.append(", &__temp, 1);\n");
      sb.append("    PUSH(__temp);\n");
      sb.append("    __frame_size <<= 8;\n");
      sb.append("    __frame_size += __temp;\n");

      sb.append("    FileReader_read(__file_descr__");
      sb.append(selfID);
      sb.append(", &__temp, 1);\n");
      sb.append("    PUSH(__temp);\n");
      sb.append("    __frame_size <<= 8;\n");
      sb.append("    __frame_size += __temp;\n");

      // the frame size includes the four bytes used to state the frame size
      sb.append("    FileReader_read(__file_descr__");
      sb.append(selfID);
      sb.append(", (void *)(BUFFER + HEAD), __frame_size - 4);\n");
      sb.append("    HEAD += __frame_size - 4;\n");
    } else {
      sb.append("    PUSH(FileReader_read<");
      sb.append(theType);
      sb.append(">(__file_descr__");
      sb.append(selfID);
      sb.append("));\n");
    }
    sb.append("  }\n");

    String template = sb.toString();

    /*
               "  #ifdef FUSED" + "\n" +
               "    #ifdef NOMOD" + "\n" +
               "      // read directly into buffer" + "\n" +
               "      if (fread(&(BUFFER[HEAD]), sizeof(BUFFER[HEAD]), ____n, FILEREADER)) {" + "\n" +
               "        HEAD+=____n;" + "\n" +
               "      }" + "\n" +
               "    #else" + "\n" +
               "      // wraparound buffer, might have to read in two pieces (but never" + "\n" +
               "      // more, since we would overwrote what we already wrote on this call)" + "\n" +
               "      if (HEAD+____n <= __BUF_SIZE_MASK) {" + "\n" +
               "          // no overflow" + "\n" +
               "          if (fread(&(BUFFER[HEAD]), sizeof(BUFFER[HEAD]), ____n, FILEREADER)) {" + "\n" +
               "             HEAD+=____n;" + "\n" +
               "          }" + "\n" +
               "      } else {" + "\n" +
               "          // overflow, need two pieces" + "\n" +
               "          int piece1 = __BUF_SIZE_MASK - HEAD;" + "\n" +
               "          int piece2 = ____n - piece1;" + "\n" +
               "          if (fread(&(BUFFER[HEAD]), sizeof(BUFFER[HEAD]), piece1, FILEREADER)) {" + "\n" +
               "              if (fread(&(BUFFER[0]), sizeof(BUFFER[HEAD]), piece2, FILEREADER)) {" + "\n" +
               "                HEAD+=____n;" + "\n" +
               "                HEAD&=__BUF_SIZE_MASK;" + "\n" +
               "              }" + "\n" +
               "          }" + "\n" +
               "      }" + "\n" +
               "     #endif" + "\n" +
               "  #else" + "\n" +
               "    // read as a block" + "\n" +
               "    TYPE __buffer[____n];" + "\n" +
               "    int __index;" + "\n" +
               "    if (fread(__buffer, sizeof(__buffer[0]), ____n, FILEREADER)) {" + "\n" +
               "      for (__index=0; __index < ____n; __index++) {" + "\n" +
               "       // should move push out of loop, but not clear if mult-push implemented yet" + "\n" +
               "       PUSH(__buffer[__index]);" + "\n" +
               "      }" + "\n" +
               "    }" + "\n" +
               "  #endif";
    */

    // set values of free variables
    String TYPE = theType;
    String FILEREADER = fpName(filter);
    String FUSED = "__FUSED_" + s + "_" + d;
    String NOMOD = "__NOMOD_" + s + "_" + d;
    String BUFFER = "BUFFER_" + s + "_" + d;
    String HEAD = "HEAD_" + s + "_" + d;
    String BUF_SIZE_MASK = "__BUF_SIZE_MASK_" + s + "_" + d;
    String PUSH = outputTape.getPushName();

    // replace templates with correct values
    template = Utils.replaceAll(template, "TYPE", TYPE);
    template = Utils.replaceAll(template, "FILEREADER", FILEREADER);
    template = Utils.replaceAll(template, "FUSED", FUSED);
    template = Utils.replaceAll(template, "NOMOD", NOMOD);
    template = Utils.replaceAll(template, "BUFFER", BUFFER);
    template = Utils.replaceAll(template, "HEAD", HEAD);
    template = Utils.replaceAll(template, "BUF_SIZE_MASK", BUF_SIZE_MASK);
    template = Utils.replaceAll(template, "PUSH", PUSH);

    // output code
    p.println(template);
  }