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[asan] workaround for PR16277: don't instrument AllocaInstr with alignment more than the redzone size

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2013-06-26 09:49:52 +00:00
parent 20985711c7
commit d4429214a2
2 changed files with 21 additions and 1 deletions
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3
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -451,7 +451,7 @@ struct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> {
StackAlignment = std::max(StackAlignment, AI.getAlignment());
AllocaVec.push_back(&AI);
uint64_t AlignedSize = getAlignedAllocaSize(&AI);
uint64_t AlignedSize = getAlignedAllocaSize(&AI);
TotalStackSize += AlignedSize;
}
@ -488,6 +488,7 @@ struct FunctionStackPoisoner : public InstVisitor<FunctionStackPoisoner> {
bool isInterestingAlloca(AllocaInst &AI) {
return (!AI.isArrayAllocation() &&
AI.isStaticAlloca() &&
AI.getAlignment() <= RedzoneSize() &&
AI.getAllocatedType()->isSized());
}

19
test/Instrumentation/AddressSanitizer/basic.ll
View File

@ -89,6 +89,25 @@ entry:
; CHECK-NOT: = alloca
; CHECK: ret void
; Check that asan does not touch allocas with alignment > 32.
define void @alloca_alignment_test() sanitize_address {
entry:
%x = alloca [10 x i8], align 64
%y = alloca [10 x i8], align 128
%z = alloca [10 x i8], align 256
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_alignment_test()
; CHECK: = alloca{{.*}} align 64
; CHECK: = alloca{{.*}} align 128
; CHECK: = alloca{{.*}} align 256
; CHECK: ret void
define void @LongDoubleTest(x86_fp80* nocapture %a) nounwind uwtable sanitize_address {
entry:
store x86_fp80 0xK3FFF8000000000000000, x86_fp80* %a, align 16