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8031752: Failed speculative optimizations should be reattempted when root of compilation is different

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Support for speculative traps that keep track of the root of the compilation in which a trap occurs.

Reviewed-by: kvn, twisti
This commit is contained in:
Roland Westrelin 2014-02-25 18:16:24 +01:00
parent 532b570e81
commit 493557fc90
16 changed files with 772 additions and 164 deletions
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15
hotspot/src/share/vm/runtime/deoptimization.hpp
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@ -59,6 +59,7 @@ class Deoptimization : AllStatic {
Reason_age, // nmethod too old; tier threshold reached
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_LIMIT,
// Note: Keep this enum in sync. with _trap_reason_name.
Reason_RECORDED_LIMIT = Reason_bimorphic // some are not recorded per bc
@ -311,10 +312,23 @@ class Deoptimization : AllStatic {
return reason;
else if (reason == Reason_div0_check) // null check due to divide-by-zero?
return Reason_null_check; // recorded per BCI as a null check
else if (reason == Reason_speculate_class_check)
return Reason_class_check;
else
return Reason_none;
}
static bool reason_is_speculate(int reason) {
if (reason == Reason_speculate_class_check) {
return true;
}
return false;
}
static uint per_method_trap_limit(int reason) {
return reason_is_speculate(reason) ? (uint)PerMethodSpecTrapLimit : (uint)PerMethodTrapLimit;
}
static const char* trap_reason_name(int reason);
static const char* trap_action_name(int action);
// Format like reason='foo' action='bar' index='123'.
@ -337,6 +351,7 @@ class Deoptimization : AllStatic {
static ProfileData* query_update_method_data(MethodData* trap_mdo,
int trap_bci,
DeoptReason reason,
Method* compiled_method,
//outputs:
uint& ret_this_trap_count,
bool& ret_maybe_prior_trap,