Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Verifier/alias.ll

@@ -0,0 +1,33 @@
+; RUN:  not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
+
+
+declare void @f()
+@fa = alias void (), void ()* @f
+; CHECK: Alias must point to a definition
+; CHECK-NEXT: @fa
+
+@g = external global i32
+@ga = alias i32, i32* @g
+; CHECK: Alias must point to a definition
+; CHECK-NEXT: @ga
+
+define available_externally void @f2() {
+  ret void
+}
+@fa2 = alias void(), void()* @f2
+; CHECK: Alias must point to a definition
+; CHECK-NEXT: @fa2
+
+@test2_a = alias i32, i32* @test2_b
+@test2_b = alias i32, i32* @test2_a
+; CHECK:      Aliases cannot form a cycle
+; CHECK-NEXT: i32* @test2_a
+; CHECK-NEXT: Aliases cannot form a cycle
+; CHECK-NEXT: i32* @test2_b
+
+
+@test3_a = global i32 42
+@test3_b = weak alias i32, i32* @test3_a
+@test3_c = alias i32, i32* @test3_b
+; CHECK: Alias cannot point to an interposable alias
+; CHECK-NEXT: i32* @test3_c