1 // RUN: %clang_cc1 -fsanitize=implicit-integer-sign-change -fsanitize-recover=implicit-integer-sign-change -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s -implicit-check-not="call void @__ubsan_handle_implicit_conversion" --check-prefixes=CHECK 2 3 // Test plan: 4 // * Two types - int and char 5 // * Two signs - signed and unsigned 6 // * Square that - we have input and output types. 7 // Thus, there are total of (2*2)^2 == 16 tests. 8 // These are all the possible variations/combinations of casts. 9 // However, not all of them should result in the check. 10 // So here, we *only* check which should and which should not result in checks. 11 12 // CHECK-DAG: @[[LINE_900_SIGN_CHANGE:.*]] = {{.*}}, i32 900, i32 10 }, {{.*}}, {{.*}}, i8 3 } 13 // CHECK-DAG: @[[LINE_1000_SIGN_CHANGE:.*]] = {{.*}}, i32 1000, i32 10 }, {{.*}}, {{.*}}, i8 3 } 14 // CHECK-DAG: @[[LINE_1100_SIGN_CHANGE:.*]] = {{.*}}, i32 1100, i32 10 }, {{.*}}, {{.*}}, i8 3 } 15 // CHECK-DAG: @[[LINE_1200_SIGN_CHANGE:.*]] = {{.*}}, i32 1200, i32 10 }, {{.*}}, {{.*}}, i8 3 } 16 // CHECK-DAG: @[[LINE_1300_SIGN_CHANGE:.*]] = {{.*}}, i32 1300, i32 10 }, {{.*}}, {{.*}}, i8 3 } 17 // CHECK-DAG: @[[LINE_1400_SIGN_CHANGE:.*]] = {{.*}}, i32 1400, i32 10 }, {{.*}}, {{.*}}, i8 3 } 18 // CHECK-DAG: @[[LINE_1500_SIGN_CHANGE:.*]] = {{.*}}, i32 1500, i32 10 }, {{.*}}, {{.*}}, i8 3 } 19 // CHECK-DAG: @[[LINE_1600_SIGN_CHANGE:.*]] = {{.*}}, i32 1600, i32 10 }, {{.*}}, {{.*}}, i8 3 } 20 21 //============================================================================// 22 // Half of the cases do not need the check. // 23 //============================================================================// 24 25 //----------------------------------------------------------------------------// 26 // No cast happens at all. No check needed. 27 //----------------------------------------------------------------------------// 28 29 // CHECK-LABEL: @convert_unsigned_int_to_unsigned_int 30 unsigned int convert_unsigned_int_to_unsigned_int(unsigned int x) { 31 #line 100 32 return x; 33 } 34 35 // CHECK-LABEL: @convert_unsigned_char_to_unsigned_char 36 unsigned char convert_unsigned_char_to_unsigned_char(unsigned char x) { 37 #line 200 38 return x; 39 } 40 41 // CHECK-LABEL: @convert_signed_int_to_signed_int 42 signed int convert_signed_int_to_signed_int(signed int x) { 43 #line 300 44 return x; 45 } 46 47 // CHECK-LABEL: @convert_signed_char_to_signed_char 48 signed char convert_signed_char_to_signed_char(signed char x) { 49 #line 400 50 return x; 51 } 52 53 //----------------------------------------------------------------------------// 54 // Both types are unsigned. No check needed. 55 //----------------------------------------------------------------------------// 56 57 // CHECK-LABEL: @convert_unsigned_int_to_unsigned_char 58 unsigned char convert_unsigned_int_to_unsigned_char(unsigned int x) { 59 #line 500 60 return x; 61 } 62 63 // CHECK-LABEL: @convert_unsigned_char_to_unsigned_int 64 unsigned int convert_unsigned_char_to_unsigned_int(unsigned char x) { 65 #line 600 66 return x; 67 } 68 69 //----------------------------------------------------------------------------// 70 // Source type was unsigned, destination type is signed, but non-negative. 71 // Because zero-extension happens - the sign bit will be 0. No check needed. 72 //----------------------------------------------------------------------------// 73 74 // CHECK-LABEL: @convert_unsigned_char_to_signed_int 75 signed int convert_unsigned_char_to_signed_int(unsigned char x) { 76 #line 700 77 return x; 78 } 79 80 //----------------------------------------------------------------------------// 81 // Both types are signed, and have the same sign, since sign-extension happens, 82 // i.e. the sign bit will be propagated. No check needed. 83 //----------------------------------------------------------------------------// 84 85 // CHECK-LABEL: @convert_signed_char_to_signed_int 86 signed int convert_signed_char_to_signed_int(signed char x) { 87 #line 800 88 return x; 89 } 90 91 //============================================================================// 92 // The remaining 8 cases *do* need the check. // 93 //============================================================================// 94 95 // These 3 result in simple 'icmp sge i32 %x, 0' 96 97 // CHECK-LABEL: @convert_unsigned_int_to_signed_int 98 signed int convert_unsigned_int_to_signed_int(unsigned int x) { 99 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_900_SIGN_CHANGE]] 100 #line 900 101 return x; 102 } 103 104 // CHECK-LABEL: @convert_signed_int_to_unsigned_int 105 unsigned int convert_signed_int_to_unsigned_int(signed int x) { 106 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1000_SIGN_CHANGE]] 107 #line 1000 108 return x; 109 } 110 111 // CHECK-LABEL: @convert_signed_int_to_unsigned_char 112 unsigned char convert_signed_int_to_unsigned_char(signed int x) { 113 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1100_SIGN_CHANGE]] 114 #line 1100 115 return x; 116 } 117 118 // These 3 result in simple 'icmp sge i8 %x, 0' 119 120 // CHECK-LABEL: @convert_signed_char_to_unsigned_char 121 unsigned char convert_signed_char_to_unsigned_char(signed char x) { 122 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1200_SIGN_CHANGE]] 123 #line 1200 124 return x; 125 } 126 127 // CHECK-LABEL: @convert_unsigned_char_to_signed_char 128 signed char convert_unsigned_char_to_signed_char(unsigned char x) { 129 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1300_SIGN_CHANGE]] 130 #line 1300 131 return x; 132 } 133 134 // CHECK-LABEL: @convert_signed_char_to_unsigned_int 135 unsigned int convert_signed_char_to_unsigned_int(signed char x) { 136 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1400_SIGN_CHANGE]] 137 #line 1400 138 return x; 139 } 140 141 // 'icmp sge i8 (trunc i32 %x), 0' 142 143 // CHECK-LABEL: @convert_unsigned_int_to_signed_char 144 signed char convert_unsigned_int_to_signed_char(unsigned int x) { 145 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1500_SIGN_CHANGE]] 146 #line 1500 147 return x; 148 } 149 150 // 'xor i1 (icmp sge i8 (trunc i32 %x), 0), (icmp sge i32 %x, 0)' 151 152 // CHECK-LABEL: @convert_signed_int_to_signed_char 153 signed char convert_signed_int_to_signed_char(signed int x) { 154 // CHECK: call void @__ubsan_handle_implicit_conversion(ptr @[[LINE_1600_SIGN_CHANGE]] 155 #line 1600 156 return x; 157 } 158