[ubsan] fix vptr test on ARM

[garious]

Summary

Fixed vptr test. With this patch, all ubsan tests pass on qemu-arm.

[rsmith]

I see, the problem is that we're accidentally relying on the stack buffer 'Buffer' being 8-byte aligned.

test/ubsan/TestCases/TypeCheck/vptr.cpp

89 ↗

(On Diff #9371)

Please add an optional extra space between the two groups of 0s rather than making the second group optional.

You don't need the parens around the optional spaces.

[garious]

cleanup per Richard's feedback

[garious]

Ping

[garious]

Closed by commit rL209249 (authored by @garious).

compiler-rt/trunk/test/ubsan/TestCases/TypeCheck/vptr.cpp

case 'm':
     // CHECK-MEMBER-NEXT: [[PTR]]: note: object is of type [[DYN_TYPE:'S'|'U']]
     // CHECK-MEMBER-NEXT: {{^ .. .. .. ..  .. .. .. .. .. .. .. ..  }}
     // CHECK-MEMBER-NEXT: {{^              \^~~~~~~~~~~(~~~~~~~~~~~~)? *$}}
     // CHECK-MEMBER-NEXT: {{^              vptr for}} [[DYN_TYPE]]
     return p->b;
 
     // CHECK-NULL-MEMBER: vptr.cpp:[[@LINE-2]]:15: runtime error: member access within address [[PTR:0x[0-9a-f]*]] which does not point to an object of type 'T'
     // CHECK-NULL-MEMBER-NEXT: [[PTR]]: note: object has invalid vptr
-    // CHECK-NULL-MEMBER-NEXT: {{^ .. .. .. ..  00 00 00 00 00 00 00 00  }}
+    // CHECK-NULL-MEMBER-NEXT: {{^  ?.. .. .. ..  ?00 00 00 00  ?00 00 00 00  ?}}
     // CHECK-NULL-MEMBER-NEXT: {{^              \^~~~~~~~~~~(~~~~~~~~~~~~)? *$}}
     // CHECK-NULL-MEMBER-NEXT: {{^              invalid vptr}}
 
   case 'f':
     // CHECK-MEMFUN: vptr.cpp:[[@LINE+5]]:12: runtime error: member call on address [[PTR:0x[0-9a-f]*]] which does not point to an object of type 'T'
     // CHECK-MEMFUN-NEXT: [[PTR]]: note: object is of type [[DYN_TYPE:'S'|'U']]
     // CHECK-MEMFUN-NEXT: {{^ .. .. .. ..  .. .. .. .. .. .. .. ..  }}
     // CHECK-MEMFUN-NEXT: {{^              \^~~~~~~~~~~(~~~~~~~~~~~~)? *$}}