Add a helper macro to use the new gen-options packed format.

[dxcommon.git] / scripts / gen-options.awk

diff --git a/scripts/gen-options.awk b/scripts/gen-options.awk
index a93c47cf95e576d5a723c6101d7d315a13461f49..80adcb44177a3fb91f79b0868e4e2b07dd4ca812 100755 (executable)
--- a/scripts/gen-options.awk
+++ b/scripts/gen-options.awk
@@ -82,7 +82,9 @@
 #
 #   * the object-like macro LOPT_PACK_BITS expands to an integer constant
 #     expression, suitable for use in #if directives, that specifies the
-#     minimum number of bits required by the encoding.
+#     minimum number of bits required by the encoding.  LOPT_PACK_BITS2
+#     is the same, but rounded up to the next power of two greater than
+#     or equal to 8.
 #
 #   * the object-like macro LOPTS_PACKED_INITIALIZER expands to a
 #     comma-separated sequence of integer constant expressions, suitable
@@ -358,17 +360,18 @@ END {
 # Currently, this only works if none of the options use action specifications
 # (as these would require encoding user-specified pointer expressions and
 # arbitrary int values).
-function output_packed_macros(i, tmp, accum, max)
+function output_packed_macros(i, tmp, accum, max, totalbits)
 {
-  print "\n#define LOPT_PACK_BITS (LOPT_SC_BITS + LOPT_HA_BITS + LOPT_LS_BITS)";
+  print "";
 
   # determine number of bits to encode offsets in SOPT_STRING
   max = length(sopt_string);
-  accum = 0;
+  totalbits = accum = 0;
   for (i = 1; i <= max; i *= 2) {
     accum++;
   }
   print "#define LOPT_SC_BITS " accum;
+  totalbits += accum;
 
   # determine number of bits to encode has_arg values
   max = 0;
@@ -377,7 +380,9 @@ function output_packed_macros(i, tmp, accum, max)
     if (tmp > max)
       max = tmp;
   }
-  print "#define LOPT_HA_BITS " (max > 1 ? 2 : max > 0 ? 1 : 0);
+  accum = (max > 1 ? 2 : max > 0 ? 1 : 0);
+  print "#define LOPT_HA_BITS " accum;
+  totalbits += accum;
 
   # determine number of bits to encode offsets in lopt_strings
   max = 0;
@@ -391,6 +396,12 @@ function output_packed_macros(i, tmp, accum, max)
     accum++;
   }
   print "#define LOPT_LS_BITS " accum;
+  totalbits += accum;
+
+  print "#define LOPT_PACK_BITS " totalbits;
+  for (i = 8; i < totalbits; i *= 2)
+    ;
+  print "#define LOPT_PACK_BITS2 " i;
 
   # Now emit the packed initializer macro
   print "\n#define LOPTS_PACKED_INITIALIZER \\";