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[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.

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llvm-svn: 166267
This commit is contained in:
Kostya Serebryany 2012-10-19 06:20:53 +00:00
parent ac33a84388
commit 83b25ee2df
2 changed files with 24 additions and 0 deletions
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4
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -1148,6 +1148,10 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
}
}
// 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);
}

20
test/Instrumentation/AddressSanitizer/basic.ll
View File

@ -69,3 +69,23 @@ entry:
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