forked from OSchip/llvm-project
51 lines
2.0 KiB
LLVM
51 lines
2.0 KiB
LLVM
; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
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%struct.small = type { i8 }
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@.str = private unnamed_addr constant [4 x i8] c"%s\0A\00", align 1
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; Address-of a structure taken in a function with a loop where
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; the alloca is an incoming value to a PHI node and a use of that PHI
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; node is also an incoming value.
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; Verify that the address-of analysis does not get stuck in infinite
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; recursion when chasing the alloca through the PHI nodes.
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; Requires protector.
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define i32 @foo(i32 %arg) nounwind uwtable safestack {
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bb:
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; CHECK: __safestack_unsafe_stack_ptr
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%tmp = alloca %struct.small*, align 8
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%tmp1 = call i32 (...) @dummy(%struct.small** %tmp) nounwind
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%tmp2 = load %struct.small*, %struct.small** %tmp, align 8
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%tmp3 = ptrtoint %struct.small* %tmp2 to i64
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%tmp4 = trunc i64 %tmp3 to i32
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%tmp5 = icmp sgt i32 %tmp4, 0
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br i1 %tmp5, label %bb6, label %bb21
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bb6: ; preds = %bb17, %bb
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%tmp7 = phi %struct.small* [ %tmp19, %bb17 ], [ %tmp2, %bb ]
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%tmp8 = phi i64 [ %tmp20, %bb17 ], [ 1, %bb ]
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%tmp9 = phi i32 [ %tmp14, %bb17 ], [ %tmp1, %bb ]
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%tmp10 = getelementptr inbounds %struct.small, %struct.small* %tmp7, i64 0, i32 0
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%tmp11 = load i8, i8* %tmp10, align 1
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%tmp12 = icmp eq i8 %tmp11, 1
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%tmp13 = add nsw i32 %tmp9, 8
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%tmp14 = select i1 %tmp12, i32 %tmp13, i32 %tmp9
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%tmp15 = trunc i64 %tmp8 to i32
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%tmp16 = icmp eq i32 %tmp15, %tmp4
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br i1 %tmp16, label %bb21, label %bb17
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bb17: ; preds = %bb6
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%tmp18 = getelementptr inbounds %struct.small*, %struct.small** %tmp, i64 %tmp8
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%tmp19 = load %struct.small*, %struct.small** %tmp18, align 8
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%tmp20 = add i64 %tmp8, 1
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br label %bb6
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bb21: ; preds = %bb6, %bb
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%tmp22 = phi i32 [ %tmp1, %bb ], [ %tmp14, %bb6 ]
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%tmp23 = call i32 (...) @dummy(i32 %tmp22) nounwind
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ret i32 undef
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}
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declare i32 @dummy(...)
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