modernc.org/gc@v1.0.1-0.20240304020402-f0dba7c97c2b/testdata/errchk/test/live.go (about) 1 // errorcheckwithauto -0 -l -live -wb=0 -d=ssa/insert_resched_checks/off 2 // +build !ppc64,!ppc64le 3 // ppc64 needs a better tighten pass to make f18 pass 4 // rescheduling checks need to be turned off because there are some live variables across the inserted check call 5 6 // Copyright 2014 The Go Authors. All rights reserved. 7 // Use of this source code is governed by a BSD-style 8 // license that can be found in the LICENSE file. 9 10 // liveness tests with inlining disabled. 11 // see also live2.go. 12 13 package main 14 15 func printnl() 16 17 //go:noescape 18 func printpointer(**int) 19 20 //go:noescape 21 func printintpointer(*int) 22 23 //go:noescape 24 func printstringpointer(*string) 25 26 //go:noescape 27 func printstring(string) 28 29 //go:noescape 30 func printbytepointer(*byte) 31 32 func printint(int) 33 34 func f1() { 35 var x *int 36 printpointer(&x) // ERROR "live at call to printpointer: x$" 37 printpointer(&x) // ERROR "live at call to printpointer: x$" 38 } 39 40 func f2(b bool) { 41 if b { 42 printint(0) // nothing live here 43 return 44 } 45 var x *int 46 printpointer(&x) // ERROR "live at call to printpointer: x$" 47 printpointer(&x) // ERROR "live at call to printpointer: x$" 48 } 49 50 func f3(b1, b2 bool) { 51 // Here x and y are ambiguously live. In previous go versions they 52 // were marked as live throughout the function to avoid being 53 // poisoned in GODEBUG=gcdead=1 mode; this is now no longer the 54 // case. 55 56 printint(0) 57 if b1 == false { 58 printint(0) 59 return 60 } 61 62 if b2 { 63 var x *int 64 printpointer(&x) // ERROR "live at call to printpointer: x$" 65 printpointer(&x) // ERROR "live at call to printpointer: x$" 66 } else { 67 var y *int 68 printpointer(&y) // ERROR "live at call to printpointer: y$" 69 printpointer(&y) // ERROR "live at call to printpointer: y$" 70 } 71 printint(0) // ERROR "f3: x \(type \*int\) is ambiguously live$" "f3: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$" 72 } 73 74 // The old algorithm treated x as live on all code that 75 // could flow to a return statement, so it included the 76 // function entry and code above the declaration of x 77 // but would not include an indirect use of x in an infinite loop. 78 // Check that these cases are handled correctly. 79 80 func f4(b1, b2 bool) { // x not live here 81 if b2 { 82 printint(0) // x not live here 83 return 84 } 85 var z **int 86 x := new(int) 87 *x = 42 88 z = &x 89 printint(**z) // ERROR "live at call to printint: x$" 90 if b2 { 91 printint(1) // x not live here 92 return 93 } 94 for { 95 printint(**z) // ERROR "live at call to printint: x$" 96 } 97 } 98 99 func f5(b1 bool) { 100 var z **int 101 if b1 { 102 x := new(int) 103 *x = 42 104 z = &x 105 } else { 106 y := new(int) 107 *y = 54 108 z = &y 109 } 110 printint(**z) // ERROR "f5: x \(type \*int\) is ambiguously live$" "f5: y \(type \*int\) is ambiguously live$" "live at call to printint: x y$" 111 } 112 113 // confusion about the _ result used to cause spurious "live at entry to f6: _". 114 115 func f6() (_, y string) { 116 y = "hello" 117 return 118 } 119 120 // confusion about addressed results used to cause "live at entry to f7: x". 121 122 func f7() (x string) { 123 _ = &x 124 x = "hello" 125 return 126 } 127 128 // ignoring block returns used to cause "live at entry to f8: x, y". 129 130 func f8() (x, y string) { 131 return g8() 132 } 133 134 func g8() (string, string) 135 136 // ignoring block assignments used to cause "live at entry to f9: x" 137 // issue 7205 138 139 var i9 interface{} 140 141 func f9() bool { 142 g8() 143 x := i9 144 y := interface{}(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+ x.data x.type$" "live at call to str: x.data x.type$" 145 i9 = y // make y escape so the line above has to call convT2E 146 return x != y 147 } 148 149 // liveness formerly confused by UNDEF followed by RET, 150 // leading to "live at entry to f10: ~r1" (unnamed result). 151 152 func f10() string { 153 panic(1) 154 } 155 156 // liveness formerly confused by select, thinking runtime.selectgo 157 // can return to next instruction; it always jumps elsewhere. 158 // note that you have to use at least two cases in the select 159 // to get a true select; smaller selects compile to optimized helper functions. 160 161 var c chan *int 162 var b bool 163 164 // this used to have a spurious "live at entry to f11a: ~r0" 165 func f11a() *int { 166 select { // ERROR "live at call to newselect: .autotmp_[0-9]+$" "live at call to selectgo: .autotmp_[0-9]+$" 167 case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$" 168 return nil 169 case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$" 170 return nil 171 } 172 } 173 174 func f11b() *int { 175 p := new(int) 176 if b { 177 // At this point p is dead: the code here cannot 178 // get to the bottom of the function. 179 // This used to have a spurious "live at call to printint: p". 180 printint(1) // nothing live here! 181 select { // ERROR "live at call to newselect: .autotmp_[0-9]+$" "live at call to selectgo: .autotmp_[0-9]+$" 182 case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$" 183 return nil 184 case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+$" 185 return nil 186 } 187 } 188 println(*p) 189 return nil 190 } 191 192 var sink *int 193 194 func f11c() *int { 195 p := new(int) 196 sink = p // prevent stack allocation, otherwise p is rematerializeable 197 if b { 198 // Unlike previous, the cases in this select fall through, 199 // so we can get to the println, so p is not dead. 200 printint(1) // ERROR "live at call to printint: p$" 201 select { // ERROR "live at call to newselect: .autotmp_[0-9]+ p$" "live at call to selectgo: .autotmp_[0-9]+ p$" 202 case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+ p$" 203 case <-c: // ERROR "live at call to selectrecv: .autotmp_[0-9]+ p$" 204 } 205 } 206 println(*p) 207 return nil 208 } 209 210 // similarly, select{} does not fall through. 211 // this used to have a spurious "live at entry to f12: ~r0". 212 213 func f12() *int { 214 if b { 215 select {} 216 } else { 217 return nil 218 } 219 } 220 221 // incorrectly placed VARDEF annotations can cause missing liveness annotations. 222 // this used to be missing the fact that s is live during the call to g13 (because it is 223 // needed for the call to h13). 224 225 func f13() { 226 s := g14() 227 s = h13(s, g13(s)) // ERROR "live at call to g13: s.ptr$" 228 } 229 230 func g13(string) string 231 func h13(string, string) string 232 233 // more incorrectly placed VARDEF. 234 235 func f14() { 236 x := g14() 237 printstringpointer(&x) // ERROR "live at call to printstringpointer: x$" 238 } 239 240 func g14() string 241 242 // Checking that various temporaries do not persist or cause 243 // ambiguously live values that must be zeroed. 244 // The exact temporary names are inconsequential but we are 245 // trying to check that there is only one at any given site, 246 // and also that none show up in "ambiguously live" messages. 247 248 var m map[string]int 249 var mi map[interface{}]int 250 251 // str and iface are used to ensure that a temp is required for runtime calls below. 252 func str() string 253 func iface() interface{} 254 255 func f16() { 256 if b { 257 delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$" 258 } 259 delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$" 260 delete(mi, iface()) // ERROR "live at call to mapdelete: .autotmp_[0-9]+$" 261 } 262 263 var m2s map[string]*byte 264 var m2 map[[2]string]*byte 265 var x2 [2]string 266 var bp *byte 267 268 func f17a(p *byte) { // ERROR "live at entry to f17a: p$" 269 if b { 270 m2[x2] = p // ERROR "live at call to mapassign: p$" 271 } 272 m2[x2] = p // ERROR "live at call to mapassign: p$" 273 m2[x2] = p // ERROR "live at call to mapassign: p$" 274 } 275 276 func f17b(p *byte) { // ERROR "live at entry to f17b: p$" 277 // key temporary 278 if b { 279 m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$" 280 } 281 m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$" 282 m2s[str()] = p // ERROR "live at call to mapassign_faststr: p$" "live at call to str: p$" 283 } 284 285 func f17c() { 286 // key and value temporaries 287 if b { 288 m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$" 289 } 290 m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$" 291 m2s[str()] = f17d() // ERROR "live at call to f17d: .autotmp_[0-9]+$" "live at call to mapassign_faststr: .autotmp_[0-9]+$" 292 } 293 294 func f17d() *byte 295 296 func g18() [2]string 297 298 func f18() { 299 // key temporary for mapaccess. 300 // temporary introduced by orderexpr. 301 var z *byte 302 if b { 303 z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 304 } 305 z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 306 z = m2[g18()] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 307 printbytepointer(z) 308 } 309 310 var ch chan *byte 311 312 // byteptr is used to ensure that a temp is required for runtime calls below. 313 func byteptr() *byte 314 315 func f19() { 316 // dest temporary for channel receive. 317 var z *byte 318 319 if b { 320 z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$" 321 } 322 z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$" 323 z = <-ch // ERROR "live at call to chanrecv1: .autotmp_[0-9]+$" 324 printbytepointer(z) 325 } 326 327 func f20() { 328 // src temporary for channel send 329 if b { 330 ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$" 331 } 332 ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$" 333 ch <- byteptr() // ERROR "live at call to chansend1: .autotmp_[0-9]+$" 334 } 335 336 func f21() { 337 // key temporary for mapaccess using array literal key. 338 var z *byte 339 if b { 340 z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 341 } 342 z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 343 z = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 344 printbytepointer(z) 345 } 346 347 func f23() { 348 // key temporary for two-result map access using array literal key. 349 var z *byte 350 var ok bool 351 if b { 352 z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$" 353 } 354 z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$" 355 z, ok = m2[[2]string{"x", "y"}] // ERROR "live at call to mapaccess2: .autotmp_[0-9]+$" 356 printbytepointer(z) 357 print(ok) 358 } 359 360 func f24() { 361 // key temporary for map access using array literal key. 362 // value temporary too. 363 if b { 364 m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$" 365 } 366 m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$" 367 m2[[2]string{"x", "y"}] = nil // ERROR "live at call to mapassign: .autotmp_[0-9]+$" 368 } 369 370 // defer should not cause spurious ambiguously live variables 371 372 func f25(b bool) { 373 defer g25() 374 if b { 375 return 376 } 377 var x string 378 x = g14() 379 printstring(x) 380 } 381 382 func g25() 383 384 // non-escaping ... slices passed to function call should die on return, 385 // so that the temporaries do not stack and do not cause ambiguously 386 // live variables. 387 388 func f26(b bool) { 389 if b { 390 print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$" 391 } 392 print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$" 393 print26((*int)(nil), (*int)(nil), (*int)(nil)) // ERROR "live at call to print26: .autotmp_[0-9]+$" 394 printnl() 395 } 396 397 //go:noescape 398 func print26(...interface{}) 399 400 // non-escaping closures passed to function call should die on return 401 402 func f27(b bool) { 403 x := 0 404 if b { 405 call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$" 406 } 407 call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$" 408 call27(func() { x++ }) // ERROR "live at call to call27: .autotmp_[0-9]+$" 409 printnl() 410 } 411 412 // but defer does escape to later execution in the function 413 414 func f27defer(b bool) { 415 x := 0 416 if b { 417 defer call27(func() { x++ }) // ERROR "live at call to deferproc: .autotmp_[0-9]+$" "live at call to deferreturn: .autotmp_[0-9]+$" 418 } 419 defer call27(func() { x++ }) // ERROR "f27defer: .autotmp_[0-9]+ \(type struct { F uintptr; x \*int }\) is ambiguously live$" "live at call to deferproc: .autotmp_[0-9]+ .autotmp_[0-9]+$" "live at call to deferreturn: .autotmp_[0-9]+ .autotmp_[0-9]+$" 420 printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ .autotmp_[0-9]+$" 421 } // ERROR "live at call to deferreturn: .autotmp_[0-9]+ .autotmp_[0-9]+$" 422 423 // and newproc (go) escapes to the heap 424 425 func f27go(b bool) { 426 x := 0 427 if b { 428 go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" "live at call to newproc: &x$" 429 } 430 go call27(func() { x++ }) // ERROR "live at call to newobject: &x$" 431 printnl() 432 } 433 434 //go:noescape 435 func call27(func()) 436 437 // concatstring slice should die on return 438 439 var s1, s2, s3, s4, s5, s6, s7, s8, s9, s10 string 440 441 func f28(b bool) { 442 if b { 443 printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$" 444 } 445 printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$" 446 printstring(s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10) // ERROR "live at call to concatstrings: .autotmp_[0-9]+$" "live at call to printstring: .autotmp_[0-9]+$" 447 } 448 449 // map iterator should die on end of range loop 450 451 func f29(b bool) { 452 if b { 453 for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" 454 printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$" 455 } 456 } 457 for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" 458 printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$" 459 } 460 for k := range m { // ERROR "live at call to mapiterinit: .autotmp_[0-9]+$" "live at call to mapiternext: .autotmp_[0-9]+$" 461 printstring(k) // ERROR "live at call to printstring: .autotmp_[0-9]+$" 462 } 463 } 464 465 // copy of array of pointers should die at end of range loop 466 var pstructarr [10]pstruct 467 468 // Struct size choosen to make pointer to element in pstructarr 469 // not computable by strength reduction. 470 type pstruct struct { 471 intp *int 472 _ [8]byte 473 } 474 475 func f30(b bool) { 476 // two live temps during printintpointer(p): 477 // in the copy of p.intp and 478 // the internal iterator pointer if a pointer to pstruct in pstructarr 479 // can not be easily computed by strength reduction. 480 if b { 481 for _, p := range pstructarr { 482 printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$" 483 } 484 } 485 for _, p := range pstructarr { 486 printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$" 487 } 488 for _, p := range pstructarr { 489 printintpointer(p.intp) // ERROR "live at call to printintpointer: .autotmp_[0-9]+ .autotmp_[0-9]+$" 490 } 491 } 492 493 // conversion to interface should not leave temporary behind 494 495 func f31(b1, b2, b3 bool) { 496 if b1 { 497 g31(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "live at call to g31: .autotmp_[0-9]+$" 498 } 499 if b2 { 500 h31(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+ .autotmp_[0-9]+$" "live at call to h31: .autotmp_[0-9]+$" "live at call to newobject: .autotmp_[0-9]+$" 501 } 502 if b3 { 503 panic(str()) // ERROR "live at call to convT2Estring: .autotmp_[0-9]+$" "live at call to gopanic: .autotmp_[0-9]+$" 504 } 505 print(b3) 506 } 507 508 func g31(interface{}) 509 func h31(...interface{}) 510 511 // non-escaping partial functions passed to function call should die on return 512 513 type T32 int 514 515 func (t *T32) Inc() { // ERROR "live at entry to \(\*T32\).Inc: t$" 516 *t++ 517 } 518 519 var t32 T32 520 521 func f32(b bool) { 522 if b { 523 call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$" 524 } 525 call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$" 526 call32(t32.Inc) // ERROR "live at call to call32: .autotmp_[0-9]+$" 527 } 528 529 //go:noescape 530 func call32(func()) 531 532 // temporaries introduced during if conditions and && || expressions 533 // should die once the condition has been acted upon. 534 535 var m33 map[interface{}]int 536 537 func f33() { 538 if m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 539 printnl() 540 return 541 } else { 542 printnl() 543 } 544 printnl() 545 } 546 547 func f34() { 548 if m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 549 printnl() 550 return 551 } 552 printnl() 553 } 554 555 func f35() { 556 if m33[byteptr()] == 0 && m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 557 printnl() 558 return 559 } 560 printnl() 561 } 562 563 func f36() { 564 if m33[byteptr()] == 0 || m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 565 printnl() 566 return 567 } 568 printnl() 569 } 570 571 func f37() { 572 if (m33[byteptr()] == 0 || m33[byteptr()] == 0) && m33[byteptr()] == 0 { // ERROR "live at call to mapaccess1: .autotmp_[0-9]+$" 573 printnl() 574 return 575 } 576 printnl() 577 } 578 579 // select temps should disappear in the case bodies 580 581 var c38 chan string 582 583 func fc38() chan string 584 func fi38(int) *string 585 func fb38() *bool 586 587 func f38(b bool) { 588 // we don't care what temps are printed on the lines with output. 589 // we care that the println lines have no live variables 590 // and therefore no output. 591 if b { 592 select { // ERROR "live at call to newselect:( .autotmp_[0-9]+)+$" "live at call to selectgo:( .autotmp_[0-9]+)+$" 593 case <-fc38(): // ERROR "live at call to selectrecv:( .autotmp_[0-9]+)+$" 594 printnl() 595 case fc38() <- *fi38(1): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "live at call to selectsend:( .autotmp_[0-9]+)+$" 596 printnl() 597 case *fi38(2) = <-fc38(): // ERROR "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "live at call to selectrecv:( .autotmp_[0-9]+)+$" 598 printnl() 599 case *fi38(3), *fb38() = <-fc38(): // ERROR "live at call to fb38:( .autotmp_[0-9]+)+$" "live at call to fc38:( .autotmp_[0-9]+)+$" "live at call to fi38:( .autotmp_[0-9]+)+$" "live at call to selectrecv:( .autotmp_[0-9]+)+$" 600 printnl() 601 } 602 printnl() 603 } 604 printnl() 605 } 606 607 // issue 8097: mishandling of x = x during return. 608 609 func f39() (x []int) { 610 x = []int{1} 611 printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$" 612 return x 613 } 614 615 func f39a() (x []int) { 616 x = []int{1} 617 printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+$" 618 return 619 } 620 621 func f39b() (x [10]*int) { 622 x = [10]*int{} 623 x[0] = new(int) // ERROR "live at call to newobject: x$" 624 printnl() // ERROR "live at call to printnl: x$" 625 return x 626 } 627 628 func f39c() (x [10]*int) { 629 x = [10]*int{} 630 x[0] = new(int) // ERROR "live at call to newobject: x$" 631 printnl() // ERROR "live at call to printnl: x$" 632 return 633 } 634 635 // issue 8142: lost 'addrtaken' bit on inlined variables. 636 // no inlining in this test, so just checking that non-inlined works. 637 638 type T40 struct { 639 m map[int]int 640 } 641 642 //go:noescape 643 func useT40(*T40) 644 645 func newT40() *T40 { 646 ret := T40{} 647 ret.m = make(map[int]int, 42) // ERROR "live at call to makemap: &ret$" 648 return &ret 649 } 650 651 func bad40() { 652 t := newT40() 653 _ = t 654 printnl() 655 } 656 657 func good40() { 658 ret := T40{} 659 ret.m = make(map[int]int) // ERROR "live at call to fastrand: .autotmp_[0-9]+ ret$" 660 t := &ret 661 printnl() // ERROR "live at call to printnl: .autotmp_[0-9]+ ret$" 662 useT40(t) // ERROR "live at call to useT40: .autotmp_[0-9]+ ret$" 663 } 664 665 func ddd1(x, y *int) { // ERROR "live at entry to ddd1: x y$" 666 ddd2(x, y) // ERROR "live at call to ddd2: .autotmp_[0-9]+$" 667 printnl() 668 // Note: no .?autotmp live at printnl. See issue 16996. 669 } 670 func ddd2(a ...*int) { // ERROR "live at entry to ddd2: a$" 671 sink = a[0] 672 } 673 674 // issue 16016: autogenerated wrapper should have arguments live 675 type T struct{} 676 677 func (*T) Foo(ptr *int) {} 678 679 type R struct{ *T } // ERRORAUTO "live at entry to \(\*R\)\.Foo: \.this ptr" "live at entry to R\.Foo: \.this ptr" 680 681 // issue 18860: output arguments must be live all the time if there is a defer. 682 // In particular, at printint r must be live. 683 func f41(p, q *int) (r *int) { // ERROR "live at entry to f41: p q$" 684 r = p 685 defer func() { // ERROR "live at call to deferproc: q r$" "live at call to deferreturn: r$" 686 recover() 687 }() 688 printint(0) // ERROR "live at call to printint: q r$" 689 r = q 690 return // ERROR "live at call to deferreturn: r$" 691 }