[llvm-commits] [llvm] r166267 - in /llvm/trunk: lib/Transforms/Instrumentation/AddressSanitizer.cpp test/Instrumentation/AddressSanitizer/basic.ll
Kostya Serebryany
kcc at google.com
Thu Oct 18 23:20:53 PDT 2012
Author: kcc
Date: Fri Oct 19 01:20:53 2012
New Revision: 166267
URL: http://llvm.org/viewvc/llvm-project?rev=166267&view=rev
Log:
[asan] make sure asan erases old unused allocas after it created a new one. This became important after the recent move from ModulePass to FunctionPass because no cleanup is happening after asan pass any more.
Modified:
llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp
llvm/trunk/test/Instrumentation/AddressSanitizer/basic.ll
Modified: llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp?rev=166267&r1=166266&r2=166267&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/AddressSanitizer.cpp Fri Oct 19 01:20:53 2012
@@ -1148,6 +1148,10 @@
}
}
+ // We are done. Remove the old unused alloca instructions.
+ for (size_t i = 0, n = AllocaVec.size(); i < n; i++)
+ AllocaVec[i]->eraseFromParent();
+
if (ClDebugStack) {
DEBUG(dbgs() << F);
}
Modified: llvm/trunk/test/Instrumentation/AddressSanitizer/basic.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Instrumentation/AddressSanitizer/basic.ll?rev=166267&r1=166266&r2=166267&view=diff
==============================================================================
--- llvm/trunk/test/Instrumentation/AddressSanitizer/basic.ll (original)
+++ llvm/trunk/test/Instrumentation/AddressSanitizer/basic.ll Fri Oct 19 01:20:53 2012
@@ -69,3 +69,23 @@
store i32 42, i32* %a
ret void
}
+
+; Check that asan leaves just one alloca.
+
+declare void @alloca_test_use([10 x i8]*)
+define void @alloca_test() address_safety {
+entry:
+ %x = alloca [10 x i8], align 1
+ %y = alloca [10 x i8], align 1
+ %z = alloca [10 x i8], align 1
+ call void @alloca_test_use([10 x i8]* %x)
+ call void @alloca_test_use([10 x i8]* %y)
+ call void @alloca_test_use([10 x i8]* %z)
+ ret void
+}
+
+; CHECK: define void @alloca_test()
+; CHECK: = alloca
+; CHECK-NOT: = alloca
+; CHECK: ret void
+
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