1 ; This testcase ensures that CFL AA answers queries soundly when callee tries 2 ; to return an escaped pointer 3 4 ; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s 5 ; RUN: opt < %s -aa-pipeline=cfl-steens-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s 6 7 declare noalias i8* @malloc(i64) 8 declare void @opaque(i32*) 9 10 define i32* @return_escaped_callee() { 11 %ptr = call noalias i8* @malloc(i64 8) 12 %ptr_cast = bitcast i8* %ptr to i32* 13 call void @opaque(i32* %ptr_cast) 14 ret i32* %ptr_cast 15 } 16 ; CHECK-LABEL: Function: test_return_escape 17 ; CHECK: NoAlias: i32* %a, i32** %x 18 ; CHECK: NoAlias: i32* %b, i32** %x 19 ; CHECK: NoAlias: i32* %a, i32* %b 20 ; CHECK: NoAlias: i32* %c, i32** %x 21 ; CHECK: NoAlias: i32* %a, i32* %c 22 ; CHECK: NoAlias: i32* %b, i32* %c 23 ; CHECK: NoAlias: i32* %a, i32* %d 24 ; CHECK: MayAlias: i32* %b, i32* %d 25 ; CHECK: MayAlias: i32* %c, i32* %d 26 define void @test_return_escape(i32** %x) { 27 %a = alloca i32, align 4 28 %b = call i32* @return_escaped_callee() 29 %c = call i32* @return_escaped_callee() 30 %d = load i32*, i32** %x 31 32 ret void 33 }