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comparison gcc/testsuite/g++.dg/ext/attr-noreturn.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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111:04ced10e8804 131:84e7813d76e9
1 // Bug c++/83871 - wrong code due to attributes on distinct template
2 // specializations
3 // Test to verify that an explicit template specifialization does not
4 // "inherit" attribute noreturn from a primary template declared with
5 // one.
6 // { dg-do compile }
7 // { dg-options "-O -Wall -fdump-tree-optimized" }
8
9 struct Noreturn { };
10 struct Returns { };
11
12 // Primary declared noreturn but explicit specialization is not.
13 template <class T> int __attribute__ ((noreturn)) f ();
14 template <> int f<Returns>();
15
16 // Explicit specialization is noreturn but primary is not.
17 template <class T> int g ();
18 template <> int __attribute__ ((noreturn)) g<Noreturn>();
19
20 int val;
21
22 int test_primary_noreturn (char, short)
23 {
24 // Only the first call should be emitted, the second one should
25 // be eliminated because the first one doesn't return.
26 val = f<char>() + f<short>();
27 } // expect no -Wreturn-type warning here
28
29 int test_noreturn (int)
30 {
31 // Call should be retained.
32 f<int>();
33 } // expect no -Wreturn-type warning here
34
35 int test_special_return (int)
36 {
37 // Both calls must be emitted.
38 int val = f<Returns>() + f<Returns>();
39 (void)&val;
40 } // { dg-warning "no return statement in function returning non-void" }
41
42
43 int test_primary_return (void)
44 {
45 int val = g<char>() + g<int>();
46 (void)&val;
47 } // { dg-warning "no return statement in function returning non-void" }
48
49
50 int test_special_noreturn (int, long)
51 {
52 g<Noreturn>();
53 } // expect no -Wreturn-type warning here
54
55
56 // Verify that the call to f<short>() above is eliminated but the call
57 // to f<int>() and the two calls to f<Returns>() are retained.
58 // { dg-final { scan-tree-dump-not "f<short>" "optimized" } }
59 // { dg-final { scan-tree-dump-times "f<Returns>" 2 "optimized" } }
60
61 // Verify that the second call to f<Returns>() in test_special_return()
62 // is followed by __builtin_unreachable() because there is no return
63 // statement in the function.
64 // { dg-final { scan-tree-dump-times "f<Returns> \\(\\);\[\n\r \]+__builtin_unreachable" 1 "optimized" } }
65
66
67 // Verify that the call to g<short>() above is eliminated but the call
68 // to g<char>() and to g<Noreturn>() are both retained.
69 // { dg-final { scan-tree-dump-not "g<short>" "optimized" } }
70 // { dg-final { scan-tree-dump-times "g<char>" 1 "optimized" } }
71 // { dg-final { scan-tree-dump-times "g<Noreturn>" 1 "optimized" } }
72
73 // Verify that the call to g<int>() in test_primary_return() is
74 // followed by __builtin_unreachable() because there is no return
75 // statement in the function.
76 // { dg-final { scan-tree-dump-times "g<int> *\\(\\);\[\n\r \]+__builtin_unreachable" 1 "optimized" } }
77 // Verify that the call to g<Noreturn>() in test_special_noreturn()
78 // is not followed by __builtin_unreachable() even though there is no
79 // return statement in the function.
80 // { dg-final { scan-tree-dump-times "g<Noreturn> *\\(\\);\[\n\r \]+__builtin_unreachable" 0 "optimized" } }