Ejemplo n.º 1
0
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;
}