[compiler-rt] 8a3d75a - [ASan] Add read to large_func_test.cpp to prevent optimization.

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2022-03-16T17:00:32Z
New Revision: 8a3d75a76036569e011feabc6be36689e434fe66

URL: https://github.com/llvm/llvm-project/commit/8a3d75a76036569e011feabc6be36689e434fe66
DIFF: https://github.com/llvm/llvm-project/commit/8a3d75a76036569e011feabc6be36689e434fe66.diff

LOG: [ASan] Add read to large_func_test.cpp to prevent optimization.

After e5822ded562f, the call to LargeFunction can be optimized out, as x
is never accessed in main. This is causing the test to fail, because the
out-of-bounds access won't be executed.

Adding an extra read and returning the value should prevent the
optimizer from removing the call.

Added: 
    

Modified: 
    compiler-rt/test/asan/TestCases/large_func_test.cpp

Removed: 
    


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diff  --git a/compiler-rt/test/asan/TestCases/large_func_test.cpp b/compiler-rt/test/asan/TestCases/large_func_test.cpp
index 6ab76d9606269..563c1458c966e 100644
--- a/compiler-rt/test/asan/TestCases/large_func_test.cpp
+++ b/compiler-rt/test/asan/TestCases/large_func_test.cpp
@@ -54,5 +54,7 @@ int main(int argc, char **argv) {
   // CHECK-FreeBSD:{{    #0 0x.* in operator new}}
   // CHECK-Darwin: {{    #0 0x.* in .*_Zna}}
   // CHECK-NEXT:   {{    #1 0x.* in main .*large_func_test.cpp:}}[[@LINE-10]]
+  int y = x[argc];
   delete[] x;
+  return y;
 }