| 1 | // RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -std=c++11 -o - %s | FileCheck --check-prefixes=CHECK,CHECK-COMMON %s |
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| 2 | // RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -std=c++11 -O -o - %s | FileCheck %s --check-prefixes=CHECK-OPT,CHECK-COMMON |
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| 3 | // RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -std=c++11 -fno-strict-return -o - %s | FileCheck %s --check-prefixes=CHECK-NOSTRICT,CHECK-COMMON |
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| 4 | // RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -std=c++11 -fno-strict-return -Wno-return-type -o - %s | FileCheck %s --check-prefixes=CHECK-NOSTRICT,CHECK-COMMON |
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| 5 | // RUN: %clang_cc1 -emit-llvm -triple %itanium_abi_triple -std=c++11 -fno-strict-return -O -o - %s | FileCheck %s --check-prefixes=CHECK-NOSTRICT-OPT,CHECK-COMMON |
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| 6 | |
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| 7 | // CHECK-COMMON-LABEL: @_Z9no_return |
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| 8 | int no_return() { |
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| 9 | // CHECK: call void @llvm.trap |
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| 10 | // CHECK-NEXT: unreachable |
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| 11 | |
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| 12 | // CHECK-OPT-NOT: call void @llvm.trap |
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| 13 | // CHECK-OPT: unreachable |
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| 14 | |
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| 15 | // -fno-strict-return should not emit trap + unreachable but it should return |
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| 16 | // an undefined value instead. |
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| 17 | |
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| 18 | // CHECK-NOSTRICT: alloca |
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| 19 | // CHECK-NOSTRICT-NEXT: load |
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| 20 | // CHECK-NOSTRICT-NEXT: ret i32 |
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| 21 | // CHECK-NOSTRICT-NEXT: } |
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| 22 | |
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| 23 | // CHECK-NOSTRICT-OPT: ret i32 undef |
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| 24 | } |
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| 25 | |
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| 26 | enum Enum { |
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| 27 | A, B |
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| 28 | }; |
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| 29 | |
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| 30 | // CHECK-COMMON-LABEL: @_Z27returnNotViableDontOptimize4Enum |
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| 31 | int returnNotViableDontOptimize(Enum e) { |
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| 32 | switch (e) { |
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| 33 | case A: return 1; |
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| 34 | case B: return 2; |
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| 35 | } |
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| 36 | // Undefined behaviour optimization shouldn't be used when -fno-strict-return |
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| 37 | // is turned on, even if all the enum cases are covered in this function. |
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| 38 | |
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| 39 | // CHECK-NOSTRICT-NOT: call void @llvm.trap |
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| 40 | // CHECK-NOSTRICT-NOT: unreachable |
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| 41 | } |
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| 42 | |
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| 43 | struct Trivial { |
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| 44 | int x; |
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| 45 | }; |
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| 46 | |
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| 47 | // CHECK-NOSTRICT-LABEL: @_Z7trivialv |
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| 48 | Trivial trivial() { |
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| 49 | // This function returns a trivial record so -fno-strict-return should avoid |
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| 50 | // the undefined behaviour optimization. |
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| 51 | |
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| 52 | // CHECK-NOSTRICT-NOT: call void @llvm.trap |
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| 53 | // CHECK-NOSTRICT-NOT: unreachable |
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| 54 | } |
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| 55 | |
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| 56 | struct NonTrivialCopy { |
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| 57 | NonTrivialCopy(const NonTrivialCopy &); |
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| 58 | }; |
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| 59 | |
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| 60 | // CHECK-NOSTRICT-LABEL: @_Z14nonTrivialCopyv |
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| 61 | NonTrivialCopy nonTrivialCopy() { |
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| 62 | // CHECK-NOSTRICT-NOT: call void @llvm.trap |
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| 63 | // CHECK-NOSTRICT-NOT: unreachable |
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| 64 | } |
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| 65 | |
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| 66 | struct NonTrivialDefaultConstructor { |
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| 67 | int x; |
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| 68 | |
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| 69 | NonTrivialDefaultConstructor() { } |
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| 70 | }; |
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| 71 | |
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| 72 | // CHECK-NOSTRICT-LABEL: @_Z28nonTrivialDefaultConstructorv |
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| 73 | NonTrivialDefaultConstructor nonTrivialDefaultConstructor() { |
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| 74 | // CHECK-NOSTRICT-NOT: call void @llvm.trap |
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| 75 | // CHECK-NOSTRICT-NOT: unreachable |
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| 76 | } |
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| 77 | |
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| 78 | // Functions that return records with non-trivial destructors should always use |
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| 79 | // the -fstrict-return optimization. |
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| 80 | |
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| 81 | struct NonTrivialDestructor { |
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| 82 | ~NonTrivialDestructor(); |
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| 83 | }; |
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| 84 | |
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| 85 | // CHECK-NOSTRICT-LABEL: @_Z20nonTrivialDestructorv |
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| 86 | NonTrivialDestructor nonTrivialDestructor() { |
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| 87 | // CHECK-NOSTRICT: call void @llvm.trap |
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| 88 | // CHECK-NOSTRICT-NEXT: unreachable |
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| 89 | } |
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| 90 | |
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| 91 | // The behavior for lambdas should be identical to functions. |
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| 92 | // CHECK-COMMON-LABEL: @_Z10lambdaTestv |
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| 93 | void lambdaTest() { |
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| 94 | auto lambda1 = []() -> int { |
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| 95 | }; |
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| 96 | lambda1(); |
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| 97 | |
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| 98 | // CHECK: call void @llvm.trap |
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| 99 | // CHECK-NEXT: unreachable |
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| 100 | |
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| 101 | // CHECK-NOSTRICT-NOT: call void @llvm.trap |
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| 102 | // CHECK-NOSTRICT-NOT: unreachable |
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| 103 | } |
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| 104 | |
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