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