| ; RUN: opt -S -passes=rewrite-statepoints-for-gc < %s | FileCheck %s |
| ; |
| ; Regression test: |
| ; After the rewritable callsite collection if any callsite was found |
| ; in a block that was reported unreachable by DominanceTree then |
| ; removeUnreachableBlocks() was called. But it is stronger than |
| ; DominatorTree::isReachableFromEntry(), i.e. removeUnreachableBlocks |
| ; can remove some blocks for which isReachableFromEntry() returns true. |
| ; This resulted in stale pointers to the collected but removed |
| ; callsites. Such stale pointers caused crash when accessed. |
| declare void @f(ptr addrspace(1) %obj) |
| |
| define void @test(ptr addrspace(1) %arg) gc "statepoint-example" { |
| ; CHECK-LABEL: test( |
| ; CHECK-NEXT: @f |
| call void @f(ptr addrspace(1) %arg) #1 |
| br i1 true, label %not_zero, label %zero |
| |
| not_zero: |
| ret void |
| |
| ; This block is reachable but removed by removeUnreachableBlocks() |
| zero: |
| ; CHECK-NOT: @f |
| call void @f(ptr addrspace(1) %arg) #1 |
| ret void |
| |
| unreach: |
| call void @f(ptr addrspace(1) %arg) #1 |
| ret void |
| } |
| |
| attributes #1 = { norecurse noimplicitfloat } |
