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https://github.com/tobast/libunwind-eh_elf.git
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(ia64_per_thread_cache): Initialize busy/lock member.
(get_script_cache): Return NULL if caching is disabled. If HAVE_ATOMIC_OPS_H is defined, set the busy flag and if the script cache is busy already, return NULL. (put_script_cache): Don't allow it to be called for UNW_CACHE_NONE case. If HAVE_ATOMIC_OPS_H is defined, clear the "busy" flag via AO_CLEAR. (ia64_get_cached_proc_info): If we're unable to acquire the cache, return -UNW_ENOINFO. (script_init): New function. (script_new): Replace open code with call to script_init(). (uncached_find_save_locs): New function. (ia64_find_save_locs): Move code for uncached case to uncached_find_save_locs(). If get_script_cache() is unable to lock the script-cache, fall back to uncached_find_save_locs(). (ia64_script_cache_init): Delete. (Logical change 1.124)
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e939f42941
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629d7d3263
1 changed files with 71 additions and 48 deletions
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@ -29,7 +29,14 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "unwind_i.h"
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#ifdef HAVE___THREAD
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static __thread struct ia64_script_cache ia64_per_thread_cache;
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static __thread struct ia64_script_cache ia64_per_thread_cache =
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{
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#ifdef HAVE_ATOMIC_OPS_H
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.busy = AO_TS_INITIALIZER
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#else
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.lock = PTHREAD_MUTEX_INITIALIZER
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#endif
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};
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#endif
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static inline unw_hash_index_t
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@ -73,20 +80,25 @@ get_script_cache (unw_addr_space_t as, sigset_t *saved_sigmaskp)
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struct ia64_script_cache *cache = &as->global_cache;
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unw_caching_policy_t caching = as->caching_policy;
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if (caching == UNW_CACHE_NONE)
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return NULL;
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#ifdef HAVE___THREAD
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if (as->caching_policy == UNW_CACHE_PER_THREAD)
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cache = &ia64_per_thread_cache;
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#endif
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if (likely (caching != UNW_CACHE_NONE))
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#ifdef HAVE_ATOMIC_OPS_H
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if (AO_test_and_set (&cache->busy) == AO_TS_SET)
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return NULL;
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#else
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sigprocmask (SIG_SETMASK, &unwi_full_sigmask, saved_sigmaskp);
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if (likely (caching == UNW_CACHE_GLOBAL))
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{
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sigprocmask (SIG_SETMASK, &unwi_full_sigmask, saved_sigmaskp);
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if (likely (caching == UNW_CACHE_GLOBAL))
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{
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debug (200, "%s: acquiring lock\n", __FUNCTION__);
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mutex_lock (&cache->lock);
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}
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debug (200, "%s: acquiring lock\n", __FUNCTION__);
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mutex_lock (&cache->lock);
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}
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#endif
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if (as->cache_generation != cache->generation)
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{
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@ -102,13 +114,16 @@ put_script_cache (unw_addr_space_t as, struct ia64_script_cache *cache,
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{
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unw_caching_policy_t caching = as->caching_policy;
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if (likely (caching != UNW_CACHE_NONE))
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{
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debug (200, "%s: unmasking signals/releasing lock\n", __FUNCTION__);
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if (likely (caching == UNW_CACHE_GLOBAL))
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mutex_unlock (&cache->lock);
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sigprocmask (SIG_SETMASK, saved_sigmaskp, NULL);
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}
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assert (caching != UNW_CACHE_NONE);
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debug (200, "%s: unmasking signals/releasing lock\n", __FUNCTION__);
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#ifdef HAVE_ATOMIC_OPS_H
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AO_CLEAR (&cache->busy);
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#else
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if (likely (caching == UNW_CACHE_GLOBAL))
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mutex_unlock (&cache->lock);
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sigprocmask (SIG_SETMASK, saved_sigmaskp, NULL);
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#endif
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}
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static struct ia64_script *
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@ -152,6 +167,8 @@ ia64_get_cached_proc_info (struct cursor *c)
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sigset_t saved_sigmask;
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cache = get_script_cache (c->as, &saved_sigmask);
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if (!cache)
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return -UNW_ENOINFO; /* cache is busy */
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{
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script = script_lookup (cache, c);
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if (script)
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@ -161,6 +178,15 @@ ia64_get_cached_proc_info (struct cursor *c)
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return script ? 0 : -UNW_ENOINFO;
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}
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static inline void
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script_init (struct ia64_script *script, unw_word_t ip)
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{
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script->ip = ip;
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script->hint = 0;
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script->count = 0;
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script->abi_marker = 0;
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}
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static inline struct ia64_script *
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script_new (struct ia64_script_cache *cache, unw_word_t ip)
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{
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@ -206,10 +232,7 @@ script_new (struct ia64_script_cache *cache, unw_word_t ip)
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script->coll_chain = cache->hash[index];
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cache->hash[index] = script - cache->buckets;
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script->ip = ip;
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script->hint = 0;
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script->count = 0;
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script->abi_marker = 0;
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script_init (script, ip);
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return script;
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}
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@ -497,6 +520,26 @@ run_script (struct ia64_script *script, struct cursor *c)
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return 0;
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}
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static int
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uncached_find_save_locs (struct cursor *c)
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{
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struct ia64_script script;
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int ret = 0;
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if ((ret = ia64_fetch_proc_info (c, c->ip, 1)) < 0)
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return ret;
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script_init (&script, c->ip);
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if ((ret = build_script (c, &script)) < 0)
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{
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if (ret != -UNW_ESTOPUNWIND)
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dprintf ("%s: failed to build unwind script for ip %lx\n",
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__FUNCTION__, (long) c->ip);
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return ret;
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}
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return run_script (&script, c);
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}
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HIDDEN int
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ia64_find_save_locs (struct cursor *c)
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{
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@ -505,29 +548,16 @@ ia64_find_save_locs (struct cursor *c)
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sigset_t saved_sigmask;
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int ret = 0;
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if (unlikely (c->as->caching_policy == UNW_CACHE_NONE))
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{
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struct ia64_script tmp_script;
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if ((ret = ia64_fetch_proc_info (c, c->ip, 1)) < 0)
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return ret;
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script = &tmp_script;
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script->ip = c->ip;
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script->hint = 0;
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script->count = 0;
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if ((ret = build_script (c, script)) < 0)
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{
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if (ret != -UNW_ESTOPUNWIND)
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dprintf ("%s: failed to build unwind script for ip %lx\n",
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__FUNCTION__, (long) c->ip);
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return ret;
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}
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run_script (script, c);
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return 0;
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}
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if (c->as->caching_policy == UNW_CACHE_NONE)
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return uncached_find_save_locs (c);
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cache = get_script_cache (c->as, &saved_sigmask);
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if (!cache)
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{
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debug (125, "%s: contention on script-cached; doing uncached lookup\n",
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__FUNCTION__);
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return uncached_find_save_locs (c);
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}
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{
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script = script_lookup (cache, c);
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debug (125, "%s: ip %lx %s in script cache\n",
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@ -559,16 +589,9 @@ ia64_find_save_locs (struct cursor *c)
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goto out;
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}
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run_script (script, c);
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ret = run_script (script, c);
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}
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out:
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put_script_cache (c->as, cache, &saved_sigmask);
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return ret;
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}
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HIDDEN void
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ia64_script_cache_init (struct ia64_script_cache *cache)
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{
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mutex_init (&cache->lock);
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flush_script_cache (cache);
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}
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