33 lines
1.1 KiB
LLVM
33 lines
1.1 KiB
LLVM
|
; This testcase ensures that CFL AA answers queries soundly when callee tries
|
||
|
|
; to return an escaped pointer
|
||
|
|
|
||
|
|
; RUN: opt < %s -disable-basic-aa -cfl-steens-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
|
||
|
|
; RUN: opt < %s -aa-pipeline=cfl-steens-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
|
||
|
|
|
||
|
|
declare noalias i8* @malloc(i64)
|
||
|
|
declare void @opaque(i32*)
|
||
|
|
|
||
|
|
define i32* @return_escaped_callee() {
|
||
|
|
%ptr = call noalias i8* @malloc(i64 8)
|
||
|
|
%ptr_cast = bitcast i8* %ptr to i32*
|
||
|
|
call void @opaque(i32* %ptr_cast)
|
||
|
|
ret i32* %ptr_cast
|
||
|
|
}
|
||
|
|
; CHECK-LABEL: Function: test_return_escape
|
||
|
|
; CHECK: NoAlias: i32* %a, i32** %x
|
||
|
|
; CHECK: NoAlias: i32* %b, i32** %x
|
||
|
|
; CHECK: NoAlias: i32* %a, i32* %b
|
||
|
|
; CHECK: NoAlias: i32* %c, i32** %x
|
||
|
|
; CHECK: NoAlias: i32* %a, i32* %c
|
||
|
|
; CHECK: NoAlias: i32* %b, i32* %c
|
||
|
|
; CHECK: NoAlias: i32* %a, i32* %d
|
||
|
|
; CHECK: MayAlias: i32* %b, i32* %d
|
||
|
|
; CHECK: MayAlias: i32* %c, i32* %d
|
||
|
|
define void @test_return_escape(i32** %x) {
|
||
|
|
%a = alloca i32, align 4
|
||
|
|
%b = call i32* @return_escaped_callee()
|
||
|
|
%c = call i32* @return_escaped_callee()
|
||
|
|
%d = load i32*, i32** %x
|
||
|
|
|
||
|
|
ret void
|
||
|
|
}
|