Sanjay Patel | 4f74216 | 2017-02-13 23:10:51 +0000 | [diff] [blame] | 1 | ; RUN: opt -S -functionattrs -enable-nonnull-arg-prop %s | FileCheck %s |
Philip Reames | a88caea | 2015-08-31 19:44:38 +0000 | [diff] [blame] | 2 | declare nonnull i8* @ret_nonnull() |
| 3 | |
| 4 | ; Return a pointer trivially nonnull (call return attribute) |
| 5 | define i8* @test1() { |
| 6 | ; CHECK: define nonnull i8* @test1 |
| 7 | %ret = call i8* @ret_nonnull() |
| 8 | ret i8* %ret |
| 9 | } |
| 10 | |
| 11 | ; Return a pointer trivially nonnull (argument attribute) |
| 12 | define i8* @test2(i8* nonnull %p) { |
| 13 | ; CHECK: define nonnull i8* @test2 |
| 14 | ret i8* %p |
| 15 | } |
| 16 | |
| 17 | ; Given an SCC where one of the functions can not be marked nonnull, |
| 18 | ; can we still mark the other one which is trivially nonnull |
| 19 | define i8* @scc_binder() { |
| 20 | ; CHECK: define i8* @scc_binder |
| 21 | call i8* @test3() |
| 22 | ret i8* null |
| 23 | } |
| 24 | |
| 25 | define i8* @test3() { |
| 26 | ; CHECK: define nonnull i8* @test3 |
| 27 | call i8* @scc_binder() |
| 28 | %ret = call i8* @ret_nonnull() |
| 29 | ret i8* %ret |
| 30 | } |
| 31 | |
| 32 | ; Given a mutual recursive set of functions, we can mark them |
| 33 | ; nonnull if neither can ever return null. (In this case, they |
| 34 | ; just never return period.) |
| 35 | define i8* @test4_helper() { |
| 36 | ; CHECK: define noalias nonnull i8* @test4_helper |
| 37 | %ret = call i8* @test4() |
| 38 | ret i8* %ret |
| 39 | } |
| 40 | |
| 41 | define i8* @test4() { |
| 42 | ; CHECK: define noalias nonnull i8* @test4 |
| 43 | %ret = call i8* @test4_helper() |
| 44 | ret i8* %ret |
| 45 | } |
| 46 | |
| 47 | ; Given a mutual recursive set of functions which *can* return null |
| 48 | ; make sure we haven't marked them as nonnull. |
| 49 | define i8* @test5_helper() { |
| 50 | ; CHECK: define noalias i8* @test5_helper |
| 51 | %ret = call i8* @test5() |
| 52 | ret i8* null |
| 53 | } |
| 54 | |
| 55 | define i8* @test5() { |
| 56 | ; CHECK: define noalias i8* @test5 |
| 57 | %ret = call i8* @test5_helper() |
| 58 | ret i8* %ret |
| 59 | } |
| 60 | |
| 61 | ; Local analysis, but going through a self recursive phi |
| 62 | define i8* @test6() { |
| 63 | entry: |
| 64 | ; CHECK: define nonnull i8* @test6 |
| 65 | %ret = call i8* @ret_nonnull() |
| 66 | br label %loop |
| 67 | loop: |
| 68 | %phi = phi i8* [%ret, %entry], [%phi, %loop] |
| 69 | br i1 undef, label %loop, label %exit |
| 70 | exit: |
| 71 | ret i8* %phi |
| 72 | } |
| 73 | |
Sanjay Patel | 4f74216 | 2017-02-13 23:10:51 +0000 | [diff] [blame] | 74 | ; Test propagation of nonnull callsite args back to caller. |
| 75 | |
| 76 | declare void @use1(i8* %x) |
| 77 | declare void @use2(i8* %x, i8* %y); |
| 78 | declare void @use3(i8* %x, i8* %y, i8* %z); |
| 79 | |
| 80 | declare void @use1nonnull(i8* nonnull %x); |
| 81 | declare void @use2nonnull(i8* nonnull %x, i8* nonnull %y); |
| 82 | declare void @use3nonnull(i8* nonnull %x, i8* nonnull %y, i8* nonnull %z); |
| 83 | |
| 84 | declare i8 @use1safecall(i8* %x) readonly nounwind ; readonly+nounwind guarantees that execution continues to successor |
| 85 | |
| 86 | ; Can't extend non-null to parent for any argument because the 2nd call is not guaranteed to execute. |
| 87 | |
| 88 | define void @parent1(i8* %a, i8* %b, i8* %c) { |
| 89 | ; CHECK-LABEL: @parent1(i8* %a, i8* %b, i8* %c) |
| 90 | ; CHECK-NEXT: call void @use3(i8* %c, i8* %a, i8* %b) |
| 91 | ; CHECK-NEXT: call void @use3nonnull(i8* %b, i8* %c, i8* %a) |
| 92 | ; CHECK-NEXT: ret void |
| 93 | ; |
| 94 | call void @use3(i8* %c, i8* %a, i8* %b) |
| 95 | call void @use3nonnull(i8* %b, i8* %c, i8* %a) |
| 96 | ret void |
| 97 | } |
| 98 | |
| 99 | ; Extend non-null to parent for all arguments. |
| 100 | |
| 101 | define void @parent2(i8* %a, i8* %b, i8* %c) { |
| 102 | ; CHECK-LABEL: @parent2(i8* nonnull %a, i8* nonnull %b, i8* nonnull %c) |
| 103 | ; CHECK-NEXT: call void @use3nonnull(i8* %b, i8* %c, i8* %a) |
| 104 | ; CHECK-NEXT: call void @use3(i8* %c, i8* %a, i8* %b) |
| 105 | ; CHECK-NEXT: ret void |
| 106 | ; |
| 107 | call void @use3nonnull(i8* %b, i8* %c, i8* %a) |
| 108 | call void @use3(i8* %c, i8* %a, i8* %b) |
| 109 | ret void |
| 110 | } |
| 111 | |
| 112 | ; Extend non-null to parent for 1st argument. |
| 113 | |
| 114 | define void @parent3(i8* %a, i8* %b, i8* %c) { |
| 115 | ; CHECK-LABEL: @parent3(i8* nonnull %a, i8* %b, i8* %c) |
| 116 | ; CHECK-NEXT: call void @use1nonnull(i8* %a) |
| 117 | ; CHECK-NEXT: call void @use3(i8* %c, i8* %b, i8* %a) |
| 118 | ; CHECK-NEXT: ret void |
| 119 | ; |
| 120 | call void @use1nonnull(i8* %a) |
| 121 | call void @use3(i8* %c, i8* %b, i8* %a) |
| 122 | ret void |
| 123 | } |
| 124 | |
| 125 | ; Extend non-null to parent for last 2 arguments. |
| 126 | |
| 127 | define void @parent4(i8* %a, i8* %b, i8* %c) { |
| 128 | ; CHECK-LABEL: @parent4(i8* %a, i8* nonnull %b, i8* nonnull %c) |
| 129 | ; CHECK-NEXT: call void @use2nonnull(i8* %c, i8* %b) |
| 130 | ; CHECK-NEXT: call void @use2(i8* %a, i8* %c) |
| 131 | ; CHECK-NEXT: call void @use1(i8* %b) |
| 132 | ; CHECK-NEXT: ret void |
| 133 | ; |
| 134 | call void @use2nonnull(i8* %c, i8* %b) |
| 135 | call void @use2(i8* %a, i8* %c) |
| 136 | call void @use1(i8* %b) |
| 137 | ret void |
| 138 | } |
| 139 | |
| 140 | ; The callsite must execute in order for the attribute to transfer to the parent. |
| 141 | ; It appears benign to extend non-null to the parent in this case, but we can't do that |
| 142 | ; because it would incorrectly propagate the wrong information to its callers. |
| 143 | |
| 144 | define void @parent5(i8* %a, i1 %a_is_notnull) { |
| 145 | ; CHECK-LABEL: @parent5(i8* %a, i1 %a_is_notnull) |
| 146 | ; CHECK-NEXT: br i1 %a_is_notnull, label %t, label %f |
| 147 | ; CHECK: t: |
| 148 | ; CHECK-NEXT: call void @use1nonnull(i8* %a) |
| 149 | ; CHECK-NEXT: ret void |
| 150 | ; CHECK: f: |
| 151 | ; CHECK-NEXT: ret void |
| 152 | ; |
| 153 | br i1 %a_is_notnull, label %t, label %f |
| 154 | t: |
| 155 | call void @use1nonnull(i8* %a) |
| 156 | ret void |
| 157 | f: |
| 158 | ret void |
| 159 | } |
| 160 | |
| 161 | ; The callsite must execute in order for the attribute to transfer to the parent. |
| 162 | ; The volatile load might trap, so there's no guarantee that we'll ever get to the call. |
| 163 | |
| 164 | define i8 @parent6(i8* %a, i8* %b) { |
| 165 | ; CHECK-LABEL: @parent6(i8* %a, i8* %b) |
| 166 | ; CHECK-NEXT: [[C:%.*]] = load volatile i8, i8* %b |
| 167 | ; CHECK-NEXT: call void @use1nonnull(i8* %a) |
| 168 | ; CHECK-NEXT: ret i8 [[C]] |
| 169 | ; |
| 170 | %c = load volatile i8, i8* %b |
| 171 | call void @use1nonnull(i8* %a) |
| 172 | ret i8 %c |
| 173 | } |
| 174 | |
| 175 | ; The nonnull callsite is guaranteed to execute, so the argument must be nonnull throughout the parent. |
| 176 | |
| 177 | define i8 @parent7(i8* %a) { |
| 178 | ; CHECK-LABEL: @parent7(i8* nonnull %a) |
| 179 | ; CHECK-NEXT: [[RET:%.*]] = call i8 @use1safecall(i8* %a) |
| 180 | ; CHECK-NEXT: call void @use1nonnull(i8* %a) |
| 181 | ; CHECK-NEXT: ret i8 [[RET]] |
| 182 | ; |
| 183 | %ret = call i8 @use1safecall(i8* %a) |
| 184 | call void @use1nonnull(i8* %a) |
| 185 | ret i8 %ret |
| 186 | } |
| 187 | |
| 188 | ; Make sure that an invoke works similarly to a call. |
| 189 | |
| 190 | declare i32 @esfp(...) |
| 191 | |
| 192 | define i1 @parent8(i8* %a, i8* %bogus1, i8* %b) personality i8* bitcast (i32 (...)* @esfp to i8*){ |
| 193 | ; CHECK-LABEL: @parent8(i8* nonnull %a, i8* nocapture readnone %bogus1, i8* nonnull %b) |
| 194 | ; CHECK-NEXT: entry: |
| 195 | ; CHECK-NEXT: invoke void @use2nonnull(i8* %a, i8* %b) |
| 196 | ; CHECK-NEXT: to label %cont unwind label %exc |
| 197 | ; CHECK: cont: |
| 198 | ; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq i8* %b, null |
| 199 | ; CHECK-NEXT: ret i1 [[NULL_CHECK]] |
| 200 | ; CHECK: exc: |
| 201 | ; CHECK-NEXT: [[LP:%.*]] = landingpad { i8*, i32 } |
| 202 | ; CHECK-NEXT: filter [0 x i8*] zeroinitializer |
| 203 | ; CHECK-NEXT: unreachable |
| 204 | ; |
| 205 | entry: |
| 206 | invoke void @use2nonnull(i8* %a, i8* %b) |
| 207 | to label %cont unwind label %exc |
| 208 | |
| 209 | cont: |
| 210 | %null_check = icmp eq i8* %b, null |
| 211 | ret i1 %null_check |
| 212 | |
| 213 | exc: |
| 214 | %lp = landingpad { i8*, i32 } |
| 215 | filter [0 x i8*] zeroinitializer |
| 216 | unreachable |
| 217 | } |
Philip Reames | a88caea | 2015-08-31 19:44:38 +0000 | [diff] [blame] | 218 | |
Nuno Lopes | 404f106 | 2017-09-09 18:23:11 +0000 | [diff] [blame] | 219 | ; CHECK: define nonnull i32* @gep1( |
| 220 | define i32* @gep1(i32* %p) { |
| 221 | %q = getelementptr inbounds i32, i32* %p, i32 1 |
| 222 | ret i32* %q |
| 223 | } |
| 224 | |
| 225 | ; CHECK: define i32 addrspace(3)* @gep2( |
| 226 | define i32 addrspace(3)* @gep2(i32 addrspace(3)* %p) { |
| 227 | %q = getelementptr inbounds i32, i32 addrspace(3)* %p, i32 1 |
| 228 | ret i32 addrspace(3)* %q |
| 229 | } |