1 /*
2  * Copyright (C) 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 public class Main {
main(String[] args)18   public static void main(String[] args) throws Exception {
19     try {
20       $noinline$testEndsWithThrow();
21       throw new Exception("Unreachable");
22     } catch (Error expected) {
23     }
24 
25     try {
26       $noinline$testEndsWithThrowButNotDirectly();
27       throw new Exception("Unreachable");
28     } catch (Error expected) {
29     }
30   }
31 
32   // Empty methods are easy to inline anywhere.
easyToInline()33   private static void easyToInline() {}
$inline$easyToInline()34   private static void $inline$easyToInline() {}
twoLevelEasyToInline()35   private static void twoLevelEasyToInline() { easyToInline(); }
36 
37   /// CHECK-START: int Main.$noinline$testEndsWithThrow() inliner (before)
38   /// CHECK: InvokeStaticOrDirect method_name:Main.twoLevelEasyToInline
39 
40   /// CHECK-START: int Main.$noinline$testEndsWithThrow() inliner (after)
41   /// CHECK: InvokeStaticOrDirect method_name:Main.twoLevelEasyToInline
$noinline$testEndsWithThrow()42   static int $noinline$testEndsWithThrow() {
43     // Use two level inlining to avoid a pattern match in the inliner.
44     // The pattern matching is deliberately done before we check if inlining is "encouraged"
45     // which includes checking if the block ends with a `throw`.
46     twoLevelEasyToInline();
47     throw new Error("");
48   }
49 
50   // Currently we only stop inlining if the method's basic block ends with a throw. We do not stop
51   // inlining for methods that eventually always end with a throw.
$noinline$testEndsWithThrowButNotDirectly()52   static int $noinline$testEndsWithThrowButNotDirectly() {
53     $inline$easyToInline();
54     if (justABoolean) {
55       $inline$easyToInline();
56     } else {
57       $inline$easyToInline();
58     }
59     throw new Error("");
60   }
61 
62   static boolean justABoolean;
63 }
64