[Darwin][ASan][Test] Create a noinlined wrapper function for reliable suppression in test. (llvm#131247)

CFStringCreateWithBytes may not always appear on stack due to
optimizations. Create a wrapper function for the purposes of testing
suppression files that will always appear on stack for test stability.

rdar://144800068

Author: padriff

compiler-rt/test/asan/TestCases/Darwin/suppressions-sandbox.cpp

@@ -3,7 +3,7 @@
 // RUN: not %run %t 2>&1 | FileCheck --check-prefix=CHECK-CRASH %s
 
 // Check that suppressing a function name works within a no-fork sandbox
-// RUN: echo "interceptor_via_fun:CFStringCreateWithBytes" > %t.supp
+// RUN: echo "interceptor_via_fun:createCFString" > %t.supp
 // RUN: %env_asan_opts=suppressions='"%t.supp"' \
 // RUN:   sandbox-exec -p '(version 1)(allow default)(deny process-fork)' \
 // RUN:   %run %t 2>&1 | FileCheck --check-prefix=CHECK-IGNORE %s
@@ -13,12 +13,18 @@
 
 #include <CoreFoundation/CoreFoundation.h>
 
+// Disable optimizations to ensure that this function appears on the stack trace so our
+// configured suppressions `interceptor_via_fun:createCFString` can take effect.
+__attribute__((noinline, disable_tail_calls)) CFStringRef
+createCFString(const unsigned char *bytes, CFIndex length) {
+  return CFStringCreateWithBytes(kCFAllocatorDefault, bytes, length,
+                                 kCFStringEncodingUTF8, FALSE);
+}
+
 int main() {
   char *a = (char *)malloc(6);
   strcpy(a, "hello");
-  CFStringRef str =
-      CFStringCreateWithBytes(kCFAllocatorDefault, (unsigned char *)a, 10,
-                              kCFStringEncodingUTF8, FALSE);  // BOOM
+  CFStringRef str = createCFString((unsigned char *)a, 10); // BOOM
   fprintf(stderr, "Ignored.\n");
   free(a);
   CFRelease(str);