[compiler-rt] c5ea9b8 - [test][asan] Make the printf-5.c test case actually emit a volatile memcpy.

[Patrick Walton via llvm-commits]

Author: Patrick Walton
Date: 2022-10-30T13:20:36-07:00
New Revision: c5ea9b8a51ddcd5121ec1bcad7b034c8aa692f52

URL: https://github.com/llvm/llvm-project/commit/c5ea9b8a51ddcd5121ec1bcad7b034c8aa692f52
DIFF: https://github.com/llvm/llvm-project/commit/c5ea9b8a51ddcd5121ec1bcad7b034c8aa692f52.diff

LOG: [test][asan] Make the printf-5.c test case actually emit a volatile memcpy.

The current test in printf-5.c appears to try to emit a volatile memcpy for the
format string, but it doesn't because the volatile qualifier is implicitly
casted away. Using a string literal instead preserves the volatile qualifier.

This is a follow-up to D137031 and is a prerequisite for D136822, which elides
memcpys in more instances and would otherwise break this test.

Differential Revision: https://reviews.llvm.org/D137042

Added: 
    

Modified: 
    compiler-rt/test/asan/TestCases/printf-5.c

Removed: 
    


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diff  --git a/compiler-rt/test/asan/TestCases/printf-5.c b/compiler-rt/test/asan/TestCases/printf-5.c
index 2257bb4e61aab..89d3a333ba1d7 100644
--- a/compiler-rt/test/asan/TestCases/printf-5.c
+++ b/compiler-rt/test/asan/TestCases/printf-5.c
@@ -14,8 +14,7 @@ int main() {
   volatile int x = 12;
   volatile float f = 1.239;
   volatile char s[] = "34";
-  volatile char fmt[2];
-  memcpy((char *)fmt, "%c %d %f %s\n", sizeof(fmt));
+  volatile char fmt[2] = "%c %d %f %s\n";
   printf((char *)fmt, c, x, f, s);
   return 0;
   // Check that format string is sanitized.