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authorTristan Gingold <gingold@adacore.com>2011-07-25 13:34:40 +0000
committerTristan Gingold <gingold@adacore.com>2011-07-25 13:34:40 +0000
commit179809c050ff97d2f72bab90b8b6fdc7f95eb0b7 (patch)
treebf93782fed4a5994e50d5befaa2c1e48435015d4 /gas/frags.c
parentd9b3f62eb21e18fca7e009d440ca16cefbce6cd6 (diff)
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2011-07-25 Tristan Gingold <gingold@adacore.com>
* frags.c (frag_grow): Simplify the code.
Diffstat (limited to 'gas/frags.c')
-rw-r--r--gas/frags.c46
1 files changed, 26 insertions, 20 deletions
diff --git a/gas/frags.c b/gas/frags.c
index fe3b4cc..a0a0a29 100644
--- a/gas/frags.c
+++ b/gas/frags.c
@@ -75,41 +75,47 @@ frag_alloc (struct obstack *ob)
return ptr;
}
-/* Try to augment current frag by nchars chars.
+/* Try to augment current frag by NCHARS chars.
If there is no room, close of the current frag with a ".fill 0"
- and begin a new frag. Unless the new frag has nchars chars available
- do not return. Do not set up any fields of *now_frag. */
+ and begin a new frag. Do not set up any fields of *now_frag. */
void
frag_grow (unsigned int nchars)
{
if (obstack_room (&frchain_now->frch_obstack) < nchars)
{
- unsigned int n;
long oldc;
+ long newc;
+ /* Not enough room in this frag. Close it. */
frag_wane (frag_now);
- frag_new (0);
- oldc = frchain_now->frch_obstack.chunk_size;
+
/* Try to allocate a bit more than needed right now. But don't do
this if we would waste too much memory. Especially necessary
- for extremely big (like 2GB initialized) frags. */
+ for extremely big (like 2GB initialized) frags. */
if (nchars < 0x10000)
- frchain_now->frch_obstack.chunk_size = 2 * nchars;
+ newc = 2 * nchars;
else
- frchain_now->frch_obstack.chunk_size = nchars + 0x10000;
- frchain_now->frch_obstack.chunk_size += SIZEOF_STRUCT_FRAG;
- if (frchain_now->frch_obstack.chunk_size > 0)
- while ((n = obstack_room (&frchain_now->frch_obstack)) < nchars
- && (unsigned long) frchain_now->frch_obstack.chunk_size > nchars)
- {
- frag_wane (frag_now);
- frag_new (0);
- }
- frchain_now->frch_obstack.chunk_size = oldc;
+ newc = nchars + 0x10000;
+ newc += SIZEOF_STRUCT_FRAG;
+
+ if (newc > 0)
+ {
+ /* Force to allocate at least NEWC bytes. */
+ oldc = obstack_chunk_size (&frchain_now->frch_obstack);
+ obstack_chunk_size (&frchain_now->frch_obstack) = newc;
+
+ /* Do the real work: create a new frag. */
+ frag_new (0);
+
+ /* Restore the old chunk size. */
+ obstack_chunk_size (&frchain_now->frch_obstack) = oldc;
+ }
+
+ /* Check for success (also handles negative values of NEWC). */
+ if (obstack_room (&frchain_now->frch_obstack) < nchars)
+ as_fatal (_("can't extend frag %u chars"), nchars);
}
- if (obstack_room (&frchain_now->frch_obstack) < nchars)
- as_fatal (_("can't extend frag %u chars"), nchars);
}
/* Call this to close off a completed frag, and start up a new (empty)