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, i32 0 }
13 // CHECK-DAG: @[[LINE_1000_SIGN_CHANGE:.*]] = {{.*}}, i32 1000, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
14 // CHECK-DAG: @[[LINE_1100_SIGN_CHANGE:.*]] = {{.*}}, i32 1100, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
15 // CHECK-DAG: @[[LINE_1200_SIGN_CHANGE:.*]] = {{.*}}, i32 1200, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
16 // CHECK-DAG: @[[LINE_1300_SIGN_CHANGE:.*]] = {{.*}}, i32 1300, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
17 // CHECK-DAG: @[[LINE_1400_SIGN_CHANGE:.*]] = {{.*}}, i32 1400, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
18 // CHECK-DAG: @[[LINE_1500_SIGN_CHANGE:.*]] = {{.*}}, i32 1500, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
19 // CHECK-DAG: @[[LINE_1600_SIGN_CHANGE:.*]] = {{.*}}, i32 1600, i32 10 }, {{.*}}, {{.*}}, i8 3, i32 0 }
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
convert_unsigned_int_to_unsigned_int(unsigned int x)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
convert_unsigned_char_to_unsigned_char(unsigned char x)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
convert_signed_int_to_signed_int(signed int x)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
convert_signed_char_to_signed_char(signed char x)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
convert_unsigned_int_to_unsigned_char(unsigned int x)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
convert_unsigned_char_to_unsigned_int(unsigned char x)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
convert_unsigned_char_to_signed_int(unsigned char x)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
convert_signed_char_to_signed_int(signed char x)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
convert_unsigned_int_to_signed_int(unsigned int x)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
convert_signed_int_to_unsigned_int(signed int x)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
convert_signed_int_to_unsigned_char(signed int x)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
convert_signed_char_to_unsigned_char(signed char x)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
convert_unsigned_char_to_signed_char(unsigned char x)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
convert_signed_char_to_unsigned_int(signed char x)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
convert_unsigned_int_to_signed_char(unsigned int x)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
convert_signed_int_to_signed_char(signed int x)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