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7153771: array bound check elimination for c1

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When possible optimize out array bound checks, inserting predicates when needed.

Reviewed-by: never, kvn, twisti
This commit is contained in:
Thomas Wuerthinger 2013-03-21 09:27:54 +01:00 • committed by Roland Westrelin
parent 2f4ecb86a2
commit 06ef4cddf7
40 changed files with 2861 additions and 153 deletions
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44
hotspot/src/share/vm/c1/c1_Runtime1.cpp
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@ -1330,6 +1330,50 @@ JRT_LEAF(int, Runtime1::is_instance_of(oopDesc* mirror, oopDesc* obj))
return (k != NULL && obj != NULL && obj->is_a(k)) ? 1 : 0;
JRT_END
JRT_ENTRY(void, Runtime1::predicate_failed_trap(JavaThread* thread))
ResourceMark rm;
assert(!TieredCompilation, "incompatible with tiered compilation");
RegisterMap reg_map(thread, false);
frame runtime_frame = thread->last_frame();
frame caller_frame = runtime_frame.sender(&reg_map);
nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
assert (nm != NULL, "no more nmethod?");
nm->make_not_entrant();
methodHandle m(nm->method());
MethodData* mdo = m->method_data();
if (mdo == NULL && !HAS_PENDING_EXCEPTION) {
// Build an MDO. Ignore errors like OutOfMemory;
// that simply means we won't have an MDO to update.
Method::build_interpreter_method_data(m, THREAD);
if (HAS_PENDING_EXCEPTION) {
assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
CLEAR_PENDING_EXCEPTION;
}
mdo = m->method_data();
}
if (mdo != NULL) {
mdo->inc_trap_count(Deoptimization::Reason_none);
}
if (TracePredicateFailedTraps) {
stringStream ss1, ss2;
vframeStream vfst(thread);
methodHandle inlinee = methodHandle(vfst.method());
inlinee->print_short_name(&ss1);
m->print_short_name(&ss2);
tty->print_cr("Predicate failed trap in method %s at bci %d inlined in %s at pc %x", ss1.as_string(), vfst.bci(), ss2.as_string(), caller_frame.pc());
}
Deoptimization::deoptimize_frame(thread, caller_frame.id());
JRT_END
#ifndef PRODUCT
void Runtime1::print_statistics() {