1; RUN: opt -objc-arc -S < %s | FileCheck %s 2 3declare i8* @objc_retain(i8*) 4declare i8* @objc_retainAutoreleasedReturnValue(i8*) 5declare void @objc_release(i8*) 6declare i8* @objc_autorelease(i8*) 7declare i8* @objc_autoreleaseReturnValue(i8*) 8declare void @objc_autoreleasePoolPop(i8*) 9declare i8* @objc_autoreleasePoolPush() 10declare i8* @objc_retainBlock(i8*) 11 12declare i8* @objc_retainedObject(i8*) 13declare i8* @objc_unretainedObject(i8*) 14declare i8* @objc_unretainedPointer(i8*) 15 16declare void @use_pointer(i8*) 17declare void @callee() 18declare void @callee_fnptr(void ()*) 19declare void @invokee() 20declare i8* @returner() 21declare i8* @returner1() 22declare i8* @returner2() 23declare void @bar(i32 ()*) 24declare void @use_alloca(i8**) 25 26declare void @llvm.dbg.value(metadata, i64, metadata, metadata) 27 28declare i8* @objc_msgSend(i8*, i8*, ...) 29 30 31; In the presence of allocas, unconditionally remove retain/release pairs only 32; if they are known safe in both directions. This prevents matching up an inner 33; retain with the boundary guarding release in the following situation: 34; 35; %A = alloca 36; retain(%x) 37; retain(%x) <--- Inner Retain 38; store %x, %A 39; %y = load %A 40; ... DO STUFF ... 41; release(%y) 42; release(%x) <--- Guarding Release 43; 44; rdar://13750319 45 46; CHECK: define void @test1a(i8* %x) 47; CHECK: @objc_retain(i8* %x) 48; CHECK: @objc_retain(i8* %x) 49; CHECK: @objc_release(i8* %y) 50; CHECK: @objc_release(i8* %x) 51; CHECK: ret void 52; CHECK: } 53define void @test1a(i8* %x) { 54entry: 55 %A = alloca i8* 56 tail call i8* @objc_retain(i8* %x) 57 tail call i8* @objc_retain(i8* %x) 58 store i8* %x, i8** %A, align 8 59 %y = load i8*, i8** %A 60 call void @use_alloca(i8** %A) 61 call void @objc_release(i8* %y), !clang.imprecise_release !0 62 call void @use_pointer(i8* %x) 63 call void @objc_release(i8* %x), !clang.imprecise_release !0 64 ret void 65} 66 67; CHECK: define void @test1b(i8* %x) 68; CHECK: @objc_retain(i8* %x) 69; CHECK: @objc_retain(i8* %x) 70; CHECK: @objc_release(i8* %y) 71; CHECK: @objc_release(i8* %x) 72; CHECK: ret void 73; CHECK: } 74define void @test1b(i8* %x) { 75entry: 76 %A = alloca i8* 77 %gep = getelementptr i8*, i8** %A, i32 0 78 tail call i8* @objc_retain(i8* %x) 79 tail call i8* @objc_retain(i8* %x) 80 store i8* %x, i8** %gep, align 8 81 %y = load i8*, i8** %A 82 call void @use_alloca(i8** %A) 83 call void @objc_release(i8* %y), !clang.imprecise_release !0 84 call void @use_pointer(i8* %x) 85 call void @objc_release(i8* %x), !clang.imprecise_release !0 86 ret void 87} 88 89 90; CHECK: define void @test1c(i8* %x) 91; CHECK: @objc_retain(i8* %x) 92; CHECK: @objc_retain(i8* %x) 93; CHECK: @objc_release(i8* %y) 94; CHECK: @objc_release(i8* %x) 95; CHECK: ret void 96; CHECK: } 97define void @test1c(i8* %x) { 98entry: 99 %A = alloca i8*, i32 3 100 %gep = getelementptr i8*, i8** %A, i32 2 101 tail call i8* @objc_retain(i8* %x) 102 tail call i8* @objc_retain(i8* %x) 103 store i8* %x, i8** %gep, align 8 104 %y = load i8*, i8** %gep 105 call void @use_alloca(i8** %A) 106 call void @objc_release(i8* %y), !clang.imprecise_release !0 107 call void @use_pointer(i8* %x) 108 call void @objc_release(i8* %x), !clang.imprecise_release !0 109 ret void 110} 111 112 113; CHECK: define void @test1d(i8* %x) 114; CHECK: @objc_retain(i8* %x) 115; CHECK: @objc_retain(i8* %x) 116; CHECK: @objc_release(i8* %y) 117; CHECK: @objc_release(i8* %x) 118; CHECK: ret void 119; CHECK: } 120define void @test1d(i8* %x) { 121entry: 122 br i1 undef, label %use_allocaA, label %use_allocaB 123 124use_allocaA: 125 %allocaA = alloca i8* 126 br label %exit 127 128use_allocaB: 129 %allocaB = alloca i8* 130 br label %exit 131 132exit: 133 %A = phi i8** [ %allocaA, %use_allocaA ], [ %allocaB, %use_allocaB ] 134 %gep = getelementptr i8*, i8** %A, i32 0 135 tail call i8* @objc_retain(i8* %x) 136 tail call i8* @objc_retain(i8* %x) 137 store i8* %x, i8** %gep, align 8 138 %y = load i8*, i8** %gep 139 call void @use_alloca(i8** %A) 140 call void @objc_release(i8* %y), !clang.imprecise_release !0 141 call void @use_pointer(i8* %x) 142 call void @objc_release(i8* %x), !clang.imprecise_release !0 143 ret void 144} 145 146; CHECK: define void @test1e(i8* %x) 147; CHECK: @objc_retain(i8* %x) 148; CHECK: @objc_retain(i8* %x) 149; CHECK: @objc_release(i8* %y) 150; CHECK: @objc_release(i8* %x) 151; CHECK: ret void 152; CHECK: } 153define void @test1e(i8* %x) { 154entry: 155 br i1 undef, label %use_allocaA, label %use_allocaB 156 157use_allocaA: 158 %allocaA = alloca i8*, i32 4 159 br label %exit 160 161use_allocaB: 162 %allocaB = alloca i8*, i32 4 163 br label %exit 164 165exit: 166 %A = phi i8** [ %allocaA, %use_allocaA ], [ %allocaB, %use_allocaB ] 167 %gep = getelementptr i8*, i8** %A, i32 2 168 tail call i8* @objc_retain(i8* %x) 169 tail call i8* @objc_retain(i8* %x) 170 store i8* %x, i8** %gep, align 8 171 %y = load i8*, i8** %gep 172 call void @use_alloca(i8** %A) 173 call void @objc_release(i8* %y), !clang.imprecise_release !0 174 call void @use_pointer(i8* %x) 175 call void @objc_release(i8* %x), !clang.imprecise_release !0 176 ret void 177} 178 179; CHECK: define void @test1f(i8* %x) 180; CHECK: @objc_retain(i8* %x) 181; CHECK: @objc_retain(i8* %x) 182; CHECK: @objc_release(i8* %y) 183; CHECK: @objc_release(i8* %x) 184; CHECK: ret void 185; CHECK: } 186define void @test1f(i8* %x) { 187entry: 188 %allocaOne = alloca i8* 189 %allocaTwo = alloca i8* 190 %A = select i1 undef, i8** %allocaOne, i8** %allocaTwo 191 tail call i8* @objc_retain(i8* %x) 192 tail call i8* @objc_retain(i8* %x) 193 store i8* %x, i8** %A, align 8 194 %y = load i8*, i8** %A 195 call void @use_alloca(i8** %A) 196 call void @objc_release(i8* %y), !clang.imprecise_release !0 197 call void @use_pointer(i8* %x) 198 call void @objc_release(i8* %x), !clang.imprecise_release !0 199 ret void 200} 201 202; Make sure that if a store is in a different basic block we handle known safe 203; conservatively. 204 205 206; CHECK: define void @test2a(i8* %x) 207; CHECK: @objc_retain(i8* %x) 208; CHECK: @objc_retain(i8* %x) 209; CHECK: @objc_release(i8* %y) 210; CHECK: @objc_release(i8* %x) 211; CHECK: ret void 212; CHECK: } 213define void @test2a(i8* %x) { 214entry: 215 %A = alloca i8* 216 store i8* %x, i8** %A, align 8 217 %y = load i8*, i8** %A 218 br label %bb1 219 220bb1: 221 br label %bb2 222 223bb2: 224 br label %bb3 225 226bb3: 227 tail call i8* @objc_retain(i8* %x) 228 tail call i8* @objc_retain(i8* %x) 229 call void @use_alloca(i8** %A) 230 call void @objc_release(i8* %y), !clang.imprecise_release !0 231 call void @use_pointer(i8* %x) 232 call void @objc_release(i8* %x), !clang.imprecise_release !0 233 ret void 234} 235 236; CHECK: define void @test2b(i8* %x) 237; CHECK: @objc_retain(i8* %x) 238; CHECK: @objc_retain(i8* %x) 239; CHECK: @objc_release(i8* %y) 240; CHECK: @objc_release(i8* %x) 241; CHECK: ret void 242; CHECK: } 243define void @test2b(i8* %x) { 244entry: 245 %A = alloca i8* 246 %gep1 = getelementptr i8*, i8** %A, i32 0 247 store i8* %x, i8** %gep1, align 8 248 %gep2 = getelementptr i8*, i8** %A, i32 0 249 %y = load i8*, i8** %gep2 250 br label %bb1 251 252bb1: 253 br label %bb2 254 255bb2: 256 br label %bb3 257 258bb3: 259 tail call i8* @objc_retain(i8* %x) 260 tail call i8* @objc_retain(i8* %x) 261 call void @use_alloca(i8** %A) 262 call void @objc_release(i8* %y), !clang.imprecise_release !0 263 call void @use_pointer(i8* %x) 264 call void @objc_release(i8* %x), !clang.imprecise_release !0 265 ret void 266} 267 268; CHECK: define void @test2c(i8* %x) 269; CHECK: @objc_retain(i8* %x) 270; CHECK: @objc_retain(i8* %x) 271; CHECK: @objc_release(i8* %y) 272; CHECK: @objc_release(i8* %x) 273; CHECK: ret void 274; CHECK: } 275define void @test2c(i8* %x) { 276entry: 277 %A = alloca i8*, i32 3 278 %gep1 = getelementptr i8*, i8** %A, i32 2 279 store i8* %x, i8** %gep1, align 8 280 %gep2 = getelementptr i8*, i8** %A, i32 2 281 %y = load i8*, i8** %gep2 282 tail call i8* @objc_retain(i8* %x) 283 br label %bb1 284 285bb1: 286 br label %bb2 287 288bb2: 289 br label %bb3 290 291bb3: 292 tail call i8* @objc_retain(i8* %x) 293 call void @use_alloca(i8** %A) 294 call void @objc_release(i8* %y), !clang.imprecise_release !0 295 call void @use_pointer(i8* %x) 296 call void @objc_release(i8* %x), !clang.imprecise_release !0 297 ret void 298} 299 300; CHECK: define void @test2d(i8* %x) 301; CHECK: @objc_retain(i8* %x) 302; CHECK: @objc_retain(i8* %x) 303; CHECK: @objc_release(i8* %y) 304; CHECK: @objc_release(i8* %x) 305; CHECK: ret void 306; CHECK: } 307define void @test2d(i8* %x) { 308entry: 309 tail call i8* @objc_retain(i8* %x) 310 br label %bb1 311 312bb1: 313 %Abb1 = alloca i8*, i32 3 314 %gepbb11 = getelementptr i8*, i8** %Abb1, i32 2 315 store i8* %x, i8** %gepbb11, align 8 316 %gepbb12 = getelementptr i8*, i8** %Abb1, i32 2 317 %ybb1 = load i8*, i8** %gepbb12 318 br label %bb3 319 320bb2: 321 %Abb2 = alloca i8*, i32 4 322 %gepbb21 = getelementptr i8*, i8** %Abb2, i32 2 323 store i8* %x, i8** %gepbb21, align 8 324 %gepbb22 = getelementptr i8*, i8** %Abb2, i32 2 325 %ybb2 = load i8*, i8** %gepbb22 326 br label %bb3 327 328bb3: 329 %A = phi i8** [ %Abb1, %bb1 ], [ %Abb2, %bb2 ] 330 %y = phi i8* [ %ybb1, %bb1 ], [ %ybb2, %bb2 ] 331 tail call i8* @objc_retain(i8* %x) 332 call void @use_alloca(i8** %A) 333 call void @objc_release(i8* %y), !clang.imprecise_release !0 334 call void @use_pointer(i8* %x) 335 call void @objc_release(i8* %x), !clang.imprecise_release !0 336 ret void 337} 338 339; Make sure in the presence of allocas, if we find a cfghazard we do not perform 340; code motion even if we are known safe. These two concepts are separate and 341; should be treated as such. 342; 343; rdar://13949644 344 345; CHECK: define void @test3a() { 346; CHECK: entry: 347; CHECK: @objc_retainAutoreleasedReturnValue 348; CHECK: @objc_retain 349; CHECK: @objc_retain 350; CHECK: @objc_retain 351; CHECK: @objc_retain 352; CHECK: arraydestroy.body: 353; CHECK: @objc_release 354; CHECK-NOT: @objc_release 355; CHECK: arraydestroy.done: 356; CHECK-NOT: @objc_release 357; CHECK: arraydestroy.body1: 358; CHECK: @objc_release 359; CHECK-NOT: @objc_release 360; CHECK: arraydestroy.done1: 361; CHECK: @objc_release 362; CHECK: ret void 363; CHECK: } 364define void @test3a() { 365entry: 366 %keys = alloca [2 x i8*], align 16 367 %objs = alloca [2 x i8*], align 16 368 369 %call1 = call i8* @returner() 370 %tmp0 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %call1) 371 372 %objs.begin = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 0 373 tail call i8* @objc_retain(i8* %call1) 374 store i8* %call1, i8** %objs.begin, align 8 375 %objs.elt = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 1 376 tail call i8* @objc_retain(i8* %call1) 377 store i8* %call1, i8** %objs.elt 378 379 %call2 = call i8* @returner1() 380 %call3 = call i8* @returner2() 381 %keys.begin = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 0 382 tail call i8* @objc_retain(i8* %call2) 383 store i8* %call2, i8** %keys.begin, align 8 384 %keys.elt = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 1 385 tail call i8* @objc_retain(i8* %call3) 386 store i8* %call3, i8** %keys.elt 387 388 %gep = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 2 389 br label %arraydestroy.body 390 391arraydestroy.body: 392 %arraydestroy.elementPast = phi i8** [ %gep, %entry ], [ %arraydestroy.element, %arraydestroy.body ] 393 %arraydestroy.element = getelementptr inbounds i8*, i8** %arraydestroy.elementPast, i64 -1 394 %destroy_tmp = load i8*, i8** %arraydestroy.element, align 8 395 call void @objc_release(i8* %destroy_tmp), !clang.imprecise_release !0 396 %objs_ptr = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 0 397 %arraydestroy.cmp = icmp eq i8** %arraydestroy.element, %objs_ptr 398 br i1 %arraydestroy.cmp, label %arraydestroy.done, label %arraydestroy.body 399 400arraydestroy.done: 401 %gep1 = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 2 402 br label %arraydestroy.body1 403 404arraydestroy.body1: 405 %arraydestroy.elementPast1 = phi i8** [ %gep1, %arraydestroy.done ], [ %arraydestroy.element1, %arraydestroy.body1 ] 406 %arraydestroy.element1 = getelementptr inbounds i8*, i8** %arraydestroy.elementPast1, i64 -1 407 %destroy_tmp1 = load i8*, i8** %arraydestroy.element1, align 8 408 call void @objc_release(i8* %destroy_tmp1), !clang.imprecise_release !0 409 %keys_ptr = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 0 410 %arraydestroy.cmp1 = icmp eq i8** %arraydestroy.element1, %keys_ptr 411 br i1 %arraydestroy.cmp1, label %arraydestroy.done1, label %arraydestroy.body1 412 413arraydestroy.done1: 414 call void @objc_release(i8* %call1), !clang.imprecise_release !0 415 ret void 416} 417 418; Make sure that even though we stop said code motion we still allow for 419; pointers to be removed if we are known safe in both directions. 420; 421; rdar://13949644 422 423; CHECK: define void @test3b() { 424; CHECK: entry: 425; CHECK: @objc_retainAutoreleasedReturnValue 426; CHECK: @objc_retain 427; CHECK: @objc_retain 428; CHECK: @objc_retain 429; CHECK: @objc_retain 430; CHECK: arraydestroy.body: 431; CHECK: @objc_release 432; CHECK-NOT: @objc_release 433; CHECK: arraydestroy.done: 434; CHECK-NOT: @objc_release 435; CHECK: arraydestroy.body1: 436; CHECK: @objc_release 437; CHECK-NOT: @objc_release 438; CHECK: arraydestroy.done1: 439; CHECK: @objc_release 440; CHECK: ret void 441; CHECK: } 442define void @test3b() { 443entry: 444 %keys = alloca [2 x i8*], align 16 445 %objs = alloca [2 x i8*], align 16 446 447 %call1 = call i8* @returner() 448 %tmp0 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %call1) 449 %tmp1 = tail call i8* @objc_retain(i8* %call1) 450 451 %objs.begin = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 0 452 tail call i8* @objc_retain(i8* %call1) 453 store i8* %call1, i8** %objs.begin, align 8 454 %objs.elt = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 1 455 tail call i8* @objc_retain(i8* %call1) 456 store i8* %call1, i8** %objs.elt 457 458 %call2 = call i8* @returner1() 459 %call3 = call i8* @returner2() 460 %keys.begin = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 0 461 tail call i8* @objc_retain(i8* %call2) 462 store i8* %call2, i8** %keys.begin, align 8 463 %keys.elt = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 1 464 tail call i8* @objc_retain(i8* %call3) 465 store i8* %call3, i8** %keys.elt 466 467 %gep = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 2 468 br label %arraydestroy.body 469 470arraydestroy.body: 471 %arraydestroy.elementPast = phi i8** [ %gep, %entry ], [ %arraydestroy.element, %arraydestroy.body ] 472 %arraydestroy.element = getelementptr inbounds i8*, i8** %arraydestroy.elementPast, i64 -1 473 %destroy_tmp = load i8*, i8** %arraydestroy.element, align 8 474 call void @objc_release(i8* %destroy_tmp), !clang.imprecise_release !0 475 %objs_ptr = getelementptr inbounds [2 x i8*], [2 x i8*]* %objs, i64 0, i64 0 476 %arraydestroy.cmp = icmp eq i8** %arraydestroy.element, %objs_ptr 477 br i1 %arraydestroy.cmp, label %arraydestroy.done, label %arraydestroy.body 478 479arraydestroy.done: 480 %gep1 = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 2 481 br label %arraydestroy.body1 482 483arraydestroy.body1: 484 %arraydestroy.elementPast1 = phi i8** [ %gep1, %arraydestroy.done ], [ %arraydestroy.element1, %arraydestroy.body1 ] 485 %arraydestroy.element1 = getelementptr inbounds i8*, i8** %arraydestroy.elementPast1, i64 -1 486 %destroy_tmp1 = load i8*, i8** %arraydestroy.element1, align 8 487 call void @objc_release(i8* %destroy_tmp1), !clang.imprecise_release !0 488 %keys_ptr = getelementptr inbounds [2 x i8*], [2 x i8*]* %keys, i64 0, i64 0 489 %arraydestroy.cmp1 = icmp eq i8** %arraydestroy.element1, %keys_ptr 490 br i1 %arraydestroy.cmp1, label %arraydestroy.done1, label %arraydestroy.body1 491 492arraydestroy.done1: 493 call void @objc_release(i8* %call1), !clang.imprecise_release !0 494 call void @objc_release(i8* %call1), !clang.imprecise_release !0 495 ret void 496} 497 498!0 = !{} 499 500declare i32 @__gxx_personality_v0(...) 501