nmethod* SimpleThresholdPolicy::event(const methodHandle& method, const methodHandle& inlinee,
int branch_bci, int bci, CompLevel comp_level, CompiledMethod* nm, JavaThread* thread) {
if (comp_level == CompLevel_none &&
JvmtiExport::can_post_interpreter_events() &&
thread->is_interp_only_mode()) {
return NULL;
}
if (CompileTheWorld || ReplayCompiles) {
// Don't trigger other compiles in testing mode
return NULL;
}
handle_counter_overflow(method());
if (method() != inlinee()) {
handle_counter_overflow(inlinee());
}
if (PrintTieredEvents) {
print_event(bci == InvocationEntryBci ? CALL : LOOP, method, inlinee, bci, comp_level);
}
if (bci == InvocationEntryBci) {
method_invocation_event(method, inlinee, comp_level, nm, thread);
} else {
// method == inlinee if the event originated in the main method
method_back_branch_event(method, inlinee, bci, comp_level, nm, thread);
// Check if event led to a higher level OSR compilation
nmethod* osr_nm = inlinee->lookup_osr_nmethod_for(bci, comp_level, false);
if (osr_nm != NULL && osr_nm->comp_level() > comp_level) {
// Perform OSR with new nmethod
return osr_nm;
}
}
return NULL;
}
nmethod* NonTieredCompPolicy::event(const methodHandle& method, const methodHandle& inlinee, int branch_bci,
int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) {
assert(comp_level == CompLevel_none, "This should be only called from the interpreter");
NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci));
if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
// If certain JVMTI events (e.g. frame pop event) are requested then the
// thread is forced to remain in interpreted code. This is
// implemented partly by a check in the run_compiled_code
// section of the interpreter whether we should skip running
// compiled code, and partly by skipping OSR compiles for
// interpreted-only threads.
if (bci != InvocationEntryBci) {
reset_counter_for_back_branch_event(method);
return NULL;
}
}
if (CompileTheWorld || ReplayCompiles) {
// Don't trigger other compiles in testing mode
if (bci == InvocationEntryBci) {
reset_counter_for_invocation_event(method);
} else {
reset_counter_for_back_branch_event(method);
}
return NULL;
}
if (bci == InvocationEntryBci) {
// when code cache is full, compilation gets switched off, UseCompiler
// is set to false
if (!method->has_compiled_code() && UseCompiler) {
method_invocation_event(method, thread);
} else {
// Force counter overflow on method entry, even if no compilation
// happened. (The method_invocation_event call does this also.)
reset_counter_for_invocation_event(method);
}
// compilation at an invocation overflow no longer goes and retries test for
// compiled method. We always run the loser of the race as interpreted.
// so return NULL
return NULL;
} else {
// counter overflow in a loop => try to do on-stack-replacement
nmethod* osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true);
NOT_PRODUCT(trace_osr_request(method, osr_nm, bci));
// when code cache is full, we should not compile any more...
if (osr_nm == NULL && UseCompiler) {
method_back_branch_event(method, bci, thread);
osr_nm = method->lookup_osr_nmethod_for(bci, CompLevel_highest_tier, true);
}
if (osr_nm == NULL) {
reset_counter_for_back_branch_event(method);
return NULL;
}
return osr_nm;
}
return NULL;
}
