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8031755: Type speculation should be used to optimize explicit null checks

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Feed profiling data about reference nullness to type speculation.

Reviewed-by: kvn, iveresov
This commit is contained in:
Roland Westrelin 2014-03-31 09:08:53 +02:00
parent f5d6f0ceb8
commit fa3b0a8f47
16 changed files with 683 additions and 418 deletions
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13
hotspot/src/share/vm/runtime/deoptimization.hpp
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@ -60,6 +60,7 @@ class Deoptimization : AllStatic {
Reason_predicate, // compiler generated predicate failed
Reason_loop_limit_check, // compiler generated loop limits check failed
Reason_speculate_class_check, // saw unexpected object class from type speculation
Reason_speculate_null_check, // saw unexpected null from type speculation
Reason_rtm_state_change, // rtm state change detected
Reason_LIMIT,
// Note: Keep this enum in sync. with _trap_reason_name.
@ -315,17 +316,27 @@ class Deoptimization : AllStatic {
return Reason_null_check; // recorded per BCI as a null check
else if (reason == Reason_speculate_class_check)
return Reason_class_check;
else if (reason == Reason_speculate_null_check)
return Reason_null_check;
else
return Reason_none;
}
static bool reason_is_speculate(int reason) {
if (reason == Reason_speculate_class_check) {
if (reason == Reason_speculate_class_check || reason == Reason_speculate_null_check) {
return true;
}
return false;
}
static DeoptReason reason_null_check(bool speculative) {
return speculative ? Deoptimization::Reason_speculate_null_check : Deoptimization::Reason_null_check;
}
static DeoptReason reason_class_check(bool speculative) {
return speculative ? Deoptimization::Reason_speculate_class_check : Deoptimization::Reason_class_check;
}
static uint per_method_trap_limit(int reason) {
return reason_is_speculate(reason) ? (uint)PerMethodSpecTrapLimit : (uint)PerMethodTrapLimit;
}