compiler-rt/test/ubsan/TestCases/Pointer/alignment-assumption-attribute-align_value-on-lvalue.cpp

   1 // RUN: %clang   -x c   -fsanitize=alignment -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   2 // RUN: %clang   -x c   -fsanitize=alignment -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   3 // RUN: %clang   -x c   -fsanitize=alignment -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   4 // RUN: %clang   -x c   -fsanitize=alignment -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   5
   6 // RUN: %clang   -x c++ -fsanitize=alignment -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   7 // RUN: %clang   -x c++ -fsanitize=alignment -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   8 // RUN: %clang   -x c++ -fsanitize=alignment -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
   9 // RUN: %clang   -x c++ -fsanitize=alignment -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not=" assumption " --implicit-check-not="note:" --implicit-check-not="error:"
  10
  11 #include <stdlib.h>
  12
  13 typedef char *__attribute__((align_value(0x8000))) aligned_char;
  14
  15 struct ac_struct {
  16   aligned_char a;
  17 };
  18
  19 char *load_from_ac_struct(struct ac_struct *x) {
  20   return x->a;
  21 }
  22
  23 int main(int argc, char* argv[]) {
  24   char *ptr = (char *)malloc(2);
  25
  26   struct ac_struct x;
  27   x.a = ptr + 1; // FIXME: it is weird that this does not also have an assumption.
  28   load_from_ac_struct(&x);
  29   // CHECK: {{.*}}alignment-assumption-{{.*}}.cpp:[[@LINE-9]]:13: runtime error: assumption of 32768 byte alignment for pointer of type 'aligned_char' (aka 'char *') failed
  30   // CHECK: {{.*}}alignment-assumption-{{.*}}.cpp:[[@LINE-17]]:30: note: alignment assumption was specified here
  31   // CHECK: 0x{{.*}}: note: address is {{.*}} aligned, misalignment offset is {{.*}} byte
  32
  33   free(ptr);
  34
  35   return 0;
  36 }