obstack-per-frchain changes

stabs.c caching changes
obstack chunksize changes

diff --git a/gas/ChangeLog b/gas/ChangeLog
index f39ca0f4ae9decd727a80bf47eb3da10f7b1077e..b6ccbd6b4ba73b9db9f6c785054cecf722d7d188 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,51 @@
 Wed Oct 18 13:20:32 1995  Ken Raeburn  <raeburn@cygnus.com>
 
+       * Use one active frag and one obstack per frag chain:
+       * frags.c (frags): Variable deleted.
+       (frag_alloc): New function.
+       (frag_grow, frag_more, frag_variant, frag_now_fix,
+       frag_append_1_char): Refer to frchain_now->frch_obstack instead of
+       frags variable.
+       (frag_new): Ditto.  Verify that frch_last and frag_now match on
+       entry and exit, and that old frag_now has non-zero type.  Replace
+       "know" uses with "assert".  Use frag_alloc instead of mucking with
+       obstack alignment.
+       * frags.h (frags): Declaration deleted.
+       * subsegs.h (struct frchain): Add new field frch_frag_now.
+       * subsegs.c (frchains, dummy_frag, absolute_frchain): New static
+       variables.
+       (subsegs_begin): Initialize frchains obstack.  Under gcc, don't
+       give it any stricter alignment than frchainS structures need.  Do
+       not initialize frags obstack.  Set frag_now to point to
+       dummy_obstack.  Initialize absolute_frchain.
+       (subseg_set_rest): Save and restore frag_now in frch_frag_now
+       field of frchainS.  Don't create new frags on section switch, and
+       use frag_alloc when creating a new frag chain.  For absolute
+       section, set frchain_now to absolute_frchain.  Verify that
+       frch_last and frag_now match on entry and exit.  Initialize
+       per-chain obstack, and under gcc, set required alignment to that
+       needed by fragS structure.
+       * write.c (chain_frchains_together_1): Verify fr_type is nonzero.
+
+       * stabs.c (get_stab_string_offset): Only copy input string if a
+       fresh copy is needed, not if the section already exists.
+       (s_stab_generic): Cache stab section name to bypass lookups, since
+       usually it will match.  Could be made faster still by changing the
+       memory allocation rules.
+       (s_xstab): Cache section name to bypass repeated string
+       allocation.
+
+       * frags.c (frag_new): Deleted register declarations.
+
+       * listing.c (frag_now): Don't declare.
+
+       * as.c (chunksize): New variable.
+       (debug_memory): New variable.
+       (main): If debug_memory is set, reduce chunksize and
+       _bfd_chunksize.
+       * as.h (chunksize): Declare it.
+       * read.c (read_begin): Use it.
+
        * config/tc-alpha.c (md_shortopts): Include 'g'.
        (md_parse_option): Ignore it.