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; RUN: llc -mtriple=x86_64-unknown-unknown -x86-indirect-branch-tracking < %s | FileCheck %s

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; This test verify the handling of ''nocf_check'' attribute by the backend. ;;
;; The file was generated using the following C code:                        ;;
;;                                                                           ;;
;; void __attribute__((nocf_check)) NoCfCheckFunc(void) {}                   ;;
;;                                                                           ;;
;; typedef void(*FuncPointer)(void);                                         ;;
;; void NoCfCheckCall(FuncPointer f) {                                       ;;
;;   __attribute__((nocf_check)) FuncPointer p = f;                          ;;
;;   (*p)();                                                                 ;;
;;   NoCfCheckFunc();                                                        ;;
;; }                                                                         ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; Make sure that a function with ''nocf_check'' attribute is not instrumented
; with endbr instruction at the beginning.
define void @NoCfCheckFunc() #0 {
; CHECK-LABEL: NoCfCheckFunc
; CHECK-NOT:   endbr64
; CHECK:       retq
entry:
  ret void
}

; Ensure the notrack prefix is added before an indirect call using a pointer
; with ''nocf_check'' attribute. Also ensure a direct call to a function with
; the ''nocf_check'' attribute is correctly generated without notrack prefix.
define void @NoCfCheckCall(ptr %f) #1 {
; CHECK-LABEL: NoCfCheckCall
; CHECK:       notrack call
; CHECK:       callq NoCfCheckFunc
entry:
  %f.addr = alloca ptr, align 4
  %p = alloca ptr, align 4
  store ptr %f, ptr %f.addr, align 4
  %0 = load ptr, ptr %f.addr, align 4
  store ptr %0, ptr %p, align 4
  %1 = load ptr, ptr %p, align 4
  call void %1() #2
	call void @NoCfCheckFunc() #2
  ret void
}

;; NOTRACK tail call is not implemented, so nocf_check just disables tail call.
define void @NoCfCheckTail(ptr %p) #1 {
; CHECK-LABEL: NoCfCheckTail:
; CHECK:       notrack callq *%rax
  %f = load ptr, ptr %p, align 4
  tail call void %f() #2
  ret void
}

define void @NoCfCheckTailCond(ptr %f, i1 %x) #1 {
; CHECK-LABEL: NoCfCheckTailCond:
; CHECK:       notrack callq *%rdi
; CHECK:       notrack callq *%rdi
entry:
  br i1 %x, label %bb1, label %bb2
bb1:
  tail call void %f() #2
  ret void
bb2:
  tail call void %f() #2
  ret void
}

attributes #0 = { nocf_check noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nocf_check }

!llvm.module.flags = !{!0}

!0 = !{i32 8, !"cf-protection-branch", i32 1}