clang/test/CodeGen/catch-implicit-integer-sign-changes-basics.c

   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 }