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Simplify control flow

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Greetings,

Attached patch gets rid of additional unnecessary branch (rs_get_cache
can not return NULL unless caching_policy is UNW_CACHE_NONE), gets rid of
goto's, and makes apply_reg_state (major CPU consumer) execute with cache
lock not held (before the patch, apply_reg_state was called with lock held
for newly-inserted entries, but not for found-in-cache entries).

Tested on Linux/x86_64 with no regressions.

Thanks,
--
Paul Pluzhnikov
This commit is contained in:
Paul Pluzhnikov 2009-11-18 17:55:01 -08:00 committed by Arun Sharma
parent f958b9dc4f
commit 2648a77f04
1 changed files with 17 additions and 25 deletions
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42
src/dwarf/Gparser.c
View file

@ -793,37 +793,29 @@ dwarf_find_save_locs (struct dwarf_cursor *c)
return uncached_dwarf_find_save_locs (c);
cache = get_rs_cache(c->as, &saved_mask);
if (!cache)
return -UNW_ENOINFO; /* cache is busy */
rs = rs_lookup(cache, c);
if (rs)
{
c->ret_addr_column = rs->ret_addr_column;
goto apply;
else
{
if ((ret = fetch_proc_info (c, c->ip, 1)) < 0 ||
(ret = create_state_record_for (c, &sr, c->ip)) < 0)
{
put_rs_cache (c->as, cache, &saved_mask);
return ret;
}
rs = rs_new (cache, c);
memcpy(rs, &sr.rs_current, offsetof(struct dwarf_reg_state, ip));
cache->buckets[c->prev_rs].hint = rs - cache->buckets;
c->hint = rs->hint;
c->prev_rs = rs - cache->buckets;
put_unwind_info (c, &c->pi);
}
if ((ret = fetch_proc_info (c, c->ip, 1)) < 0)
goto out;
if ((ret = create_state_record_for (c, &sr, c->ip)) < 0)
goto out;
rs = rs_new (cache, c);
memcpy(rs, &sr.rs_current, offsetof(struct dwarf_reg_state, ip));
cache->buckets[c->prev_rs].hint = rs - cache->buckets;
c->hint = rs->hint;
c->prev_rs = rs - cache->buckets;
put_unwind_info (c, &c->pi);
ret = apply_reg_state (c, rs);
out:
put_rs_cache (c->as, cache, &saved_mask);
return ret;
apply:
put_rs_cache (c->as, cache, &saved_mask);
if ((ret = apply_reg_state (c, rs)) < 0)
return ret;