1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164
|
; RUN: opt -function-attrs -S %s | FileCheck %s
define void @mustprogress_readnone() mustprogress {
; CHECK: Function Attrs: {{.*}} noreturn {{.*}} readnone willreturn
; CHECK-NEXT: define void @mustprogress_readnone()
;
entry:
br label %while.body
while.body:
br label %while.body
}
define i32 @mustprogress_load(i32* %ptr) mustprogress {
; CHECK: Function Attrs: {{.*}} readonly willreturn
; CHECK-NEXT: define i32 @mustprogress_load(
;
entry:
br label %while.body
while.body:
%r = load i32, i32* %ptr
br label %while.body
}
define void @mustprogress_store(i32* %ptr) mustprogress {
; CHECK-NOT: Function Attrs: {{.*}} willreturn
; CHECK: define void @mustprogress_store(
;
entry:
br label %while.body
while.body:
store i32 0, i32* %ptr
br label %while.body
}
declare void @unknown_fn()
define void @mustprogress_call_unknown_fn() mustprogress {
; CHECK-NOT: Function Attrs: {{.*}} willreturn
; CHECK: define void @mustprogress_call_unknown_fn(
;
call void @unknown_fn()
ret void
}
define i32 @mustprogress_call_known_functions(i32* %ptr) mustprogress {
; CHECK: Function Attrs: {{.*}} readonly willreturn
; CHECK-NEXT: define i32 @mustprogress_call_known_functions(
;
call void @mustprogress_readnone()
%r = call i32 @mustprogress_load(i32* %ptr)
ret i32 %r
}
declare i32 @__gxx_personality_v0(...)
define i64 @mustprogress_mayunwind() mustprogress personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK: Function Attrs: {{.*}} readnone willreturn
; CHECK-NEXT: define i64 @mustprogress_mayunwind(
;
%a = invoke i64 @fn_noread()
to label %A unwind label %B
A:
ret i64 10
B:
%val = landingpad { i8*, i32 }
catch i8* null
ret i64 0
}
; Function without loops or non-willreturn calls will return.
define void @willreturn_no_loop(i1 %c, i32* %p) {
; CHECK: Function Attrs: mustprogress willreturn
; CHECK-NEXT: define void @willreturn_no_loop(
;
br i1 %c, label %if, label %else
if:
load atomic i32, i32* %p seq_cst, align 4
call void @fn_willreturn()
br label %end
else:
store atomic i32 0, i32* %p seq_cst, align 4
br label %end
end:
ret void
}
; Calls a function that is not guaranteed to return, not willreturn.
define void @willreturn_non_returning_function(i1 %c, i32* %p) {
; CHECK-NOT: Function Attrs: {{.*}}willreturn
; CHECK: define void @willreturn_non_returning_function(
;
call void @unknown_fn()
ret void
}
; Infinite loop without mustprogress, will not return.
define void @willreturn_loop() {
; CHECK-NOT: Function Attrs: {{.*}}willreturn
; CHECK: define void @willreturn_loop(
;
br label %loop
loop:
br label %loop
}
; Finite loop. Could be willreturn but not detected.
; FIXME
define void @willreturn_finite_loop() {
; CHECK-NOT: Function Attrs: {{.*}}willreturn
; CHECK: define void @willreturn_finite_loop(
;
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry], [ %i.inc, %loop ]
%i.inc = add nuw i32 %i, 1
%c = icmp ne i32 %i.inc, 100
br i1 %c, label %loop, label %end
end:
ret void
}
; Infinite recursion without mustprogress, will not return.
define void @willreturn_recursion() {
; CHECK-NOT: Function Attrs: {{.*}}willreturn
; CHECK: define void @willreturn_recursion(
;
tail call void @willreturn_recursion()
ret void
}
; Irreducible infinite loop, will not return.
define void @willreturn_irreducible(i1 %c) {
; CHECK-NOT: Function Attrs: {{.*}}willreturn
; CHECK: define void @willreturn_irreducible(
;
br i1 %c, label %bb1, label %bb2
bb1:
br label %bb2
bb2:
br label %bb1
}
define linkonce i32 @square(i32) {
; CHECK-NOT: Function Attrs: {{.*}}willreturn
; CHECK: define linkonce i32 @square(
%2 = mul nsw i32 %0, %0
ret i32 %2
}
declare i64 @fn_noread() readnone
declare void @fn_willreturn() willreturn
|