File: unreachable-regression.ll

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.6-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,304 kB
  • sloc: cpp: 7,438,677; ansic: 1,393,822; asm: 1,012,926; python: 241,650; f90: 86,635; objc: 75,479; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (33 lines) | stat: -rw-r--r-- 1,065 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
; 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 }