| 1 | volatile int x; |
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| 2 | |
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| 3 | // clang-format off |
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| 4 | void __attribute__((noinline)) tail_call_sink() { |
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| 5 | x++; //% self.filecheck("bt", "main.cpp", "-check-prefix=TAIL-CALL-SINK") |
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| 6 | // TAIL-CALL-SINK: frame #0: 0x{{[0-9a-f]+}} a.out`tail_call_sink() at main.cpp:[[@LINE-1]]:4 |
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| 7 | // TAIL-CALL-SINK-NEXT: inlinable_function_which_tail_calls() at main.cpp{{.*}} [artificial] |
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| 8 | // TAIL-CALL-SINK-NEXT: main{{.*}} |
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| 9 | } |
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| 10 | // clang-format on |
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| 11 | |
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| 12 | void __attribute__((always_inline)) inlinable_function_which_tail_calls() { |
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| 13 | tail_call_sink(); |
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| 14 | } |
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| 15 | |
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| 16 | void __attribute__((noinline)) func3() { |
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| 17 | inlinable_function_which_tail_calls(); |
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| 18 | } |
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| 19 | |
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| 20 | // clang-format off |
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| 21 | void __attribute__((always_inline)) inline_sink() { |
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| 22 | x++; //% self.filecheck("bt", "main.cpp", "-check-prefix=INLINE-SINK") |
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| 23 | // INLINE-SINK: frame #0: 0x{{[0-9a-f]+}} a.out`inline_sink() at main.cpp:[[@LINE-1]]:4 |
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| 24 | // INLINE-SINK-NEXT: func2{{.*}} |
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| 25 | // INLINE-SINK-NEXT: func1{{.*}} [artificial] |
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| 26 | // INLINE-SINK-NEXT: main{{.*}} |
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| 27 | } |
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| 28 | // clang-format on |
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| 29 | |
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| 30 | void __attribute__((noinline)) func2() { inline_sink(); /* inlined */ } |
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| 31 | |
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| 32 | void __attribute__((noinline)) func1() { func2(); /* tail */ } |
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| 33 | |
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| 34 | int __attribute__((disable_tail_calls)) main() { |
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| 35 | // First, call a function that tail-calls a function, which itself inlines |
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| 36 | // a third function. |
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| 37 | func1(); |
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| 38 | |
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| 39 | // Next, call a function which contains an inlined tail-call. |
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| 40 | func3(); |
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| 41 | |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |
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