| Peter Collingbourne | 82437bf | 2015-06-15 21:07:11 +0000 | [diff] [blame] | 1 | ; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s |
| 2 | ; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s |
| 3 | |
| 4 | %struct.small = type { i8 } |
| 5 | |
| 6 | @.str = private unnamed_addr constant [4 x i8] c"%s\0A\00", align 1 |
| 7 | |
| 8 | ; Address-of a structure taken in a function with a loop where |
| 9 | ; the alloca is an incoming value to a PHI node and a use of that PHI |
| 10 | ; node is also an incoming value. |
| 11 | ; Verify that the address-of analysis does not get stuck in infinite |
| 12 | ; recursion when chasing the alloca through the PHI nodes. |
| 13 | ; Requires protector. |
| 14 | define i32 @foo(i32 %arg) nounwind uwtable safestack { |
| 15 | bb: |
| 16 | ; CHECK: __safestack_unsafe_stack_ptr |
| 17 | %tmp = alloca %struct.small*, align 8 |
| 18 | %tmp1 = call i32 (...) @dummy(%struct.small** %tmp) nounwind |
| 19 | %tmp2 = load %struct.small*, %struct.small** %tmp, align 8 |
| 20 | %tmp3 = ptrtoint %struct.small* %tmp2 to i64 |
| 21 | %tmp4 = trunc i64 %tmp3 to i32 |
| 22 | %tmp5 = icmp sgt i32 %tmp4, 0 |
| 23 | br i1 %tmp5, label %bb6, label %bb21 |
| 24 | |
| 25 | bb6: ; preds = %bb17, %bb |
| 26 | %tmp7 = phi %struct.small* [ %tmp19, %bb17 ], [ %tmp2, %bb ] |
| 27 | %tmp8 = phi i64 [ %tmp20, %bb17 ], [ 1, %bb ] |
| 28 | %tmp9 = phi i32 [ %tmp14, %bb17 ], [ %tmp1, %bb ] |
| 29 | %tmp10 = getelementptr inbounds %struct.small, %struct.small* %tmp7, i64 0, i32 0 |
| 30 | %tmp11 = load i8, i8* %tmp10, align 1 |
| 31 | %tmp12 = icmp eq i8 %tmp11, 1 |
| 32 | %tmp13 = add nsw i32 %tmp9, 8 |
| 33 | %tmp14 = select i1 %tmp12, i32 %tmp13, i32 %tmp9 |
| 34 | %tmp15 = trunc i64 %tmp8 to i32 |
| 35 | %tmp16 = icmp eq i32 %tmp15, %tmp4 |
| 36 | br i1 %tmp16, label %bb21, label %bb17 |
| 37 | |
| 38 | bb17: ; preds = %bb6 |
| 39 | %tmp18 = getelementptr inbounds %struct.small*, %struct.small** %tmp, i64 %tmp8 |
| 40 | %tmp19 = load %struct.small*, %struct.small** %tmp18, align 8 |
| 41 | %tmp20 = add i64 %tmp8, 1 |
| 42 | br label %bb6 |
| 43 | |
| 44 | bb21: ; preds = %bb6, %bb |
| 45 | %tmp22 = phi i32 [ %tmp1, %bb ], [ %tmp14, %bb6 ] |
| 46 | %tmp23 = call i32 (...) @dummy(i32 %tmp22) nounwind |
| 47 | ret i32 undef |
| 48 | } |
| 49 | |
| 50 | declare i32 @dummy(...) |