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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 import 'dart:async'; | |
| 6 import '../mock_compiler.dart'; | |
| 7 import 'sexpr_unstringifier.dart'; | |
| 8 import 'package:async_helper/async_helper.dart'; | |
| 9 import "package:expect/expect.dart"; | |
| 10 import 'package:compiler/src/cps_ir/cps_ir_nodes_sexpr.dart'; | |
| 11 import 'package:compiler/src/cps_ir/optimizers.dart'; | |
| 12 import 'package:compiler/src/constant_system_dart.dart'; | |
| 13 | |
| 14 // The tests in this file that ensure that sparse constant propagation on the | |
| 15 // CPS IR works as expected. | |
| 16 | |
| 17 // CP1 represents the following incoming dart code: | |
| 18 // | |
| 19 // int main() { | |
| 20 // int i = 1; | |
| 21 // int j; | |
| 22 // if (i == 1) { | |
| 23 // j = 2; | |
| 24 // } else { | |
| 25 // j = 3; | |
| 26 // } | |
| 27 // return j; | |
| 28 // } | |
| 29 | |
| 30 String CP1_IN = """ | |
| 31 (FunctionDefinition main () () return | |
| 32 (LetPrim (v0 (Constant (Int 1))) | |
| 33 (LetPrim (v1 (Constant (Int 1))) | |
| 34 (LetCont | |
| 35 ((k0 (v2) | |
| 36 (LetCont | |
| 37 ((k1 () | |
| 38 (LetPrim (v3 (Constant (Int 2))) | |
| 39 (InvokeContinuation return (v3)))) | |
| 40 (k2 () | |
| 41 (LetPrim (v4 (Constant (Int 3))) | |
| 42 (InvokeContinuation return (v4))))) | |
| 43 (Branch (IsTrue v2) k1 k2)))) | |
| 44 (InvokeMethod v0 == (v1) k0))))) | |
| 45 """; | |
| 46 String CP1_OUT = """ | |
| 47 (FunctionDefinition main () () return | |
| 48 (LetPrim (v0 (Constant (Int 1))) | |
| 49 (LetPrim (v1 (Constant (Int 1))) | |
| 50 (LetCont | |
| 51 ((k0 (v2) | |
| 52 (LetCont | |
| 53 ((k1 () | |
| 54 (LetPrim (v3 (Constant (Int 2))) | |
| 55 (InvokeContinuation return (v3)))) | |
| 56 (k2 () | |
| 57 (LetPrim (v4 (Constant (Int 3))) | |
| 58 (InvokeContinuation return (v4))))) | |
| 59 (InvokeContinuation k1 ())))) | |
| 60 (LetPrim (v5 (Constant (Bool true))) | |
| 61 (InvokeContinuation k0 (v5))))))) | |
| 62 """; | |
| 63 | |
| 64 // CP2 represents the following incoming dart code: | |
| 65 // | |
| 66 // int main() { | |
| 67 // int i = 1; | |
| 68 // while (true) { | |
| 69 // if (false || false) { | |
| 70 // return i; | |
| 71 // } | |
| 72 // if (true && i == 1) { | |
| 73 // return i; | |
| 74 // } | |
| 75 // } | |
| 76 // return 42; | |
| 77 // } | |
| 78 | |
| 79 String CP2_IN = """ | |
| 80 (FunctionDefinition main () () return | |
| 81 (LetPrim (v0 (Constant (Int 1))) | |
| 82 (LetCont | |
| 83 ((rec k0 () | |
| 84 (LetCont | |
| 85 ((k1 () | |
| 86 (LetPrim (v1 (Constant (Int 42))) | |
| 87 (InvokeContinuation return (v1)))) | |
| 88 (k2 () | |
| 89 (LetPrim (v2 (Constant (Bool false))) | |
| 90 (LetCont | |
| 91 ((k3 (v3) | |
| 92 (LetCont | |
| 93 ((k4 () | |
| 94 (InvokeContinuation return (v0))) | |
| 95 (k5 () | |
| 96 (LetPrim (v4 (Constant (Bool true))) | |
| 97 (LetCont | |
| 98 ((k6 (v5) | |
| 99 (LetCont | |
| 100 ((k7 () | |
| 101 (InvokeContinuation return (v0
))) | |
| 102 (k8 () | |
| 103 (InvokeContinuation rec k0 ())
)) | |
| 104 (Branch (IsTrue v5) k7 k8)))) | |
| 105 (LetCont | |
| 106 ((k9 () | |
| 107 (LetPrim (v6 (Constant (Int 1))) | |
| 108 (LetCont | |
| 109 ((k10 (v7) | |
| 110 (LetCont | |
| 111 ((k11 () | |
| 112 (LetPrim (v8 (Const
ant (Bool true))) | |
| 113 (InvokeContinuati
on k6 (v8)))) | |
| 114 (k12 () | |
| 115 (LetPrim (v9 (Const
ant (Bool false))) | |
| 116 (InvokeContinuati
on k6 (v9))))) | |
| 117 (Branch (IsTrue v7) k11
k12)))) | |
| 118 (InvokeMethod v0 == (v6) k10)))
) | |
| 119 (k13 () | |
| 120 (LetPrim (v10 (Constant (Bool false
))) | |
| 121 (InvokeContinuation k6 (v10))))) | |
| 122 (Branch (IsTrue v4) k9 k13)))))) | |
| 123 (Branch (IsTrue v3) k4 k5)))) | |
| 124 (LetCont | |
| 125 ((k14 () | |
| 126 (LetPrim (v11 (Constant (Bool true))) | |
| 127 (InvokeContinuation k3 (v11)))) | |
| 128 (k15 () | |
| 129 (LetPrim (v12 (Constant (Bool false))) | |
| 130 (LetCont | |
| 131 ((k16 () | |
| 132 (LetPrim (v13 (Constant (Bool true))) | |
| 133 (InvokeContinuation k3 (v13)))) | |
| 134 (k17 () | |
| 135 (LetPrim (v14 (Constant (Bool false))) | |
| 136 (InvokeContinuation k3 (v14))))) | |
| 137 (Branch (IsTrue v12) k16 k17))))) | |
| 138 (Branch (IsTrue v2) k14 k15)))))) | |
| 139 (LetPrim (v15 (Constant (Bool true))) | |
| 140 (Branch (IsTrue v15) k2 k1))))) | |
| 141 (InvokeContinuation k0 ())))) | |
| 142 """; | |
| 143 String CP2_OUT = """ | |
| 144 (FunctionDefinition main () () return | |
| 145 (LetPrim (v0 (Constant (Int 1))) | |
| 146 (LetCont | |
| 147 ((rec k0 () | |
| 148 (LetCont | |
| 149 ((k1 () | |
| 150 (LetPrim (v1 (Constant (Int 42))) | |
| 151 (InvokeContinuation return (v1)))) | |
| 152 (k2 () | |
| 153 (LetPrim (v2 (Constant (Bool false))) | |
| 154 (LetCont | |
| 155 ((k3 (v3) | |
| 156 (LetCont | |
| 157 ((k4 () | |
| 158 (InvokeContinuation return (v0))) | |
| 159 (k5 () | |
| 160 (LetPrim (v4 (Constant (Bool true))) | |
| 161 (LetCont | |
| 162 ((k6 (v5) | |
| 163 (LetCont | |
| 164 ((k7 () | |
| 165 (InvokeContinuation return (v0
))) | |
| 166 (k8 () | |
| 167 (InvokeContinuation rec k0 ())
)) | |
| 168 (InvokeContinuation k7 ())))) | |
| 169 (LetCont | |
| 170 ((k9 () | |
| 171 (LetPrim (v6 (Constant (Int 1))) | |
| 172 (LetCont | |
| 173 ((k10 (v7) | |
| 174 (LetCont | |
| 175 ((k11 () | |
| 176 (LetPrim (v8 (Const
ant (Bool true))) | |
| 177 (InvokeContinuati
on k6 (v8)))) | |
| 178 (k12 () | |
| 179 (LetPrim (v9 (Const
ant (Bool false))) | |
| 180 (InvokeContinuati
on k6 (v9))))) | |
| 181 (InvokeContinuation k11
())))) | |
| 182 (LetPrim (v10 (Constant (Bool t
rue))) | |
| 183 (InvokeContinuation k10 (v10)
))))) | |
| 184 (k13 () | |
| 185 (LetPrim (v11 (Constant (Bool false
))) | |
| 186 (InvokeContinuation k6 (v11))))) | |
| 187 (InvokeContinuation k9 ())))))) | |
| 188 (InvokeContinuation k5 ())))) | |
| 189 (LetCont | |
| 190 ((k14 () | |
| 191 (LetPrim (v12 (Constant (Bool true))) | |
| 192 (InvokeContinuation k3 (v12)))) | |
| 193 (k15 () | |
| 194 (LetPrim (v13 (Constant (Bool false))) | |
| 195 (LetCont | |
| 196 ((k16 () | |
| 197 (LetPrim (v14 (Constant (Bool true))) | |
| 198 (InvokeContinuation k3 (v14)))) | |
| 199 (k17 () | |
| 200 (LetPrim (v15 (Constant (Bool false))) | |
| 201 (InvokeContinuation k3 (v15))))) | |
| 202 (InvokeContinuation k17 ()))))) | |
| 203 (InvokeContinuation k15 ())))))) | |
| 204 (LetPrim (v16 (Constant (Bool true))) | |
| 205 (InvokeContinuation k2 ()))))) | |
| 206 (InvokeContinuation k0 ())))) | |
| 207 """; | |
| 208 | |
| 209 // CP3 represents the following incoming dart code: | |
| 210 // | |
| 211 // int main() { | |
| 212 // int i = 1; | |
| 213 // i = f(); | |
| 214 // if (i == 1) { | |
| 215 // return 42; | |
| 216 // } | |
| 217 // return i; | |
| 218 // } | |
| 219 | |
| 220 String CP3_IN = """ | |
| 221 (FunctionDefinition main () () return | |
| 222 (LetPrim (v0 (Constant (Int 1))) | |
| 223 (LetCont | |
| 224 ((k0 (v1) | |
| 225 (LetPrim (v2 (Constant (Int 1))) | |
| 226 (LetCont | |
| 227 ((k1 (v3) | |
| 228 (LetCont | |
| 229 ((k2 () | |
| 230 (LetPrim (v4 (Constant (Int 42))) | |
| 231 (InvokeContinuation return (v4)))) | |
| 232 (k3 () | |
| 233 (InvokeContinuation return (v1)))) | |
| 234 (Branch (IsTrue v3) k2 k3)))) | |
| 235 (InvokeMethod v1 == (v2) k1))))) | |
| 236 (InvokeStatic f () k0)))) | |
| 237 """; | |
| 238 String CP3_OUT = CP3_IN; | |
| 239 | |
| 240 // Addition. | |
| 241 | |
| 242 String CP4_IN = """ | |
| 243 (FunctionDefinition main () () return | |
| 244 (LetPrim (v0 (Constant (Int 1))) | |
| 245 (LetPrim (v1 (Constant (Int 2))) | |
| 246 (LetCont | |
| 247 ((k0 (v2) | |
| 248 (InvokeContinuation return (v2)))) | |
| 249 (InvokeMethod v0 + (v1) k0))))) | |
| 250 """; | |
| 251 String CP4_OUT = """ | |
| 252 (FunctionDefinition main () () return | |
| 253 (LetPrim (v0 (Constant (Int 1))) | |
| 254 (LetPrim (v1 (Constant (Int 2))) | |
| 255 (LetCont | |
| 256 ((k0 (v2) | |
| 257 (InvokeContinuation return (v2)))) | |
| 258 (LetPrim (v3 (Constant (Int 3))) | |
| 259 (InvokeContinuation k0 (v3))))))) | |
| 260 """; | |
| 261 | |
| 262 // Array access operator (no optimization). | |
| 263 | |
| 264 String CP5_IN = """ | |
| 265 (FunctionDefinition main () () return | |
| 266 (LetPrim (v0 (Constant (Int 1))) | |
| 267 (LetPrim (v1 (Constant (Int 2))) | |
| 268 (LetCont | |
| 269 ((k0 (v2) | |
| 270 (InvokeContinuation return (v2)))) | |
| 271 (InvokeMethod v0 [] (v1) k0))))) | |
| 272 """; | |
| 273 String CP5_OUT = CP5_IN; | |
| 274 | |
| 275 // Division by 0. | |
| 276 | |
| 277 String CP6_IN = """ | |
| 278 (FunctionDefinition main () () return | |
| 279 (LetPrim (v0 (Constant (Int 1))) | |
| 280 (LetPrim (v1 (Constant (Int 0))) | |
| 281 (LetCont | |
| 282 ((k0 (v2) | |
| 283 (InvokeContinuation return (v2)))) | |
| 284 (InvokeMethod v0 / (v1) k0))))) | |
| 285 """; | |
| 286 String CP6_OUT = """ | |
| 287 (FunctionDefinition main () () return | |
| 288 (LetPrim (v0 (Constant (Int 1))) | |
| 289 (LetPrim (v1 (Constant (Int 0))) | |
| 290 (LetCont | |
| 291 ((k0 (v2) | |
| 292 (InvokeContinuation return (v2)))) | |
| 293 (LetPrim (v3 (Constant (Double Infinity))) | |
| 294 (InvokeContinuation k0 (v3))))))) | |
| 295 """; | |
| 296 | |
| 297 // Concatenate strings. | |
| 298 | |
| 299 String CP7_IN = """ | |
| 300 (FunctionDefinition main () () return | |
| 301 (LetPrim (v0 (Constant (String "b"))) | |
| 302 (LetPrim (v1 (Constant (String "d"))) | |
| 303 (LetPrim (v2 (Constant (String "a"))) | |
| 304 (LetPrim (v3 (Constant (String "c"))) | |
| 305 (LetPrim (v4 (Constant (String ""))) | |
| 306 (LetCont | |
| 307 ((k0 (v5) | |
| 308 (LetCont | |
| 309 ((k1 (v6) | |
| 310 (InvokeContinuation return (v6)))) | |
| 311 (InvokeMethod v5 length () k1)))) | |
| 312 (ConcatenateStrings (v2 v0 v3 v1 v4) k0)))))))) | |
| 313 """; | |
| 314 String CP7_OUT = """ | |
| 315 (FunctionDefinition main () () return | |
| 316 (LetPrim (v0 (Constant (String "b"))) | |
| 317 (LetPrim (v1 (Constant (String "d"))) | |
| 318 (LetPrim (v2 (Constant (String "a"))) | |
| 319 (LetPrim (v3 (Constant (String "c"))) | |
| 320 (LetPrim (v4 (Constant (String ""))) | |
| 321 (LetCont | |
| 322 ((k0 (v5) | |
| 323 (LetCont | |
| 324 ((k1 (v6) | |
| 325 (InvokeContinuation return (v6)))) | |
| 326 (InvokeMethod v5 length () k1)))) | |
| 327 (LetPrim (v7 (Constant (String "abcd"))) | |
| 328 (InvokeContinuation k0 (v7)))))))))) | |
| 329 """; | |
| 330 | |
| 331 // TODO(jgruber): We can't test is-check optimization because the unstringifier | |
| 332 // does not recreate accurate types for the TypeOperator node. | |
| 333 | |
| 334 // Simple branch removal. | |
| 335 | |
| 336 String CP8_IN = """ | |
| 337 (FunctionDefinition main () () return | |
| 338 (LetPrim (v0 (Constant (Int 1))) | |
| 339 (LetPrim (v1 (Constant (Int 1))) | |
| 340 (LetCont | |
| 341 ((k0 (v2) | |
| 342 (LetCont | |
| 343 ((k1 () | |
| 344 (LetPrim (v3 (Constant (Int 42))) | |
| 345 (InvokeContinuation return (v3)))) | |
| 346 (k2 () | |
| 347 (InvokeContinuation return (v0)))) | |
| 348 (Branch (IsTrue v2) k1 k2)))) | |
| 349 (InvokeMethod v0 == (v1) k0))))) | |
| 350 """; | |
| 351 String CP8_OUT = """ | |
| 352 (FunctionDefinition main () () return | |
| 353 (LetPrim (v0 (Constant (Int 1))) | |
| 354 (LetPrim (v1 (Constant (Int 1))) | |
| 355 (LetCont | |
| 356 ((k0 (v2) | |
| 357 (LetCont | |
| 358 ((k1 () | |
| 359 (LetPrim (v3 (Constant (Int 42))) | |
| 360 (InvokeContinuation return (v3)))) | |
| 361 (k2 () | |
| 362 (InvokeContinuation return (v0)))) | |
| 363 (InvokeContinuation k1 ())))) | |
| 364 (LetPrim (v4 (Constant (Bool true))) | |
| 365 (InvokeContinuation k0 (v4))))))) | |
| 366 """; | |
| 367 | |
| 368 // While loop. | |
| 369 | |
| 370 String CP9_IN = """ | |
| 371 (FunctionDefinition main () () return | |
| 372 (LetPrim (v0 (Constant (Int 1))) | |
| 373 (LetCont | |
| 374 ((rec k0 (v1) | |
| 375 (LetCont | |
| 376 ((k1 () | |
| 377 (InvokeContinuation return (v1))) | |
| 378 (k2 () | |
| 379 (LetPrim (v2 (Constant (Int 1))) | |
| 380 (LetCont | |
| 381 ((k3 (v3) | |
| 382 (LetCont | |
| 383 ((k4 (v4) | |
| 384 (LetCont | |
| 385 ((k5 () | |
| 386 (LetPrim (v5 (Constant (Int 42))) | |
| 387 (InvokeContinuation return (v5)))) | |
| 388 (k6 () | |
| 389 (LetPrim (v6 (Constant (Int 1))) | |
| 390 (LetCont | |
| 391 ((k7 (v7) | |
| 392 (InvokeContinuation rec k0 (v7
)))) | |
| 393 (InvokeMethod v1 + (v6) k7))))) | |
| 394 (Branch (IsTrue v4) k5 k6)))) | |
| 395 (LetCont | |
| 396 ((k8 () | |
| 397 (LetPrim (v8 (Constant (Bool false))) | |
| 398 (InvokeContinuation k4 (v8)))) | |
| 399 (k9 () | |
| 400 (LetPrim (v9 (Constant (Bool true))) | |
| 401 (InvokeContinuation k4 (v9))))) | |
| 402 (Branch (IsTrue v3) k8 k9))))) | |
| 403 (InvokeMethod v1 == (v2) k3))))) | |
| 404 (LetPrim (v10 (Constant (Bool true))) | |
| 405 (Branch (IsTrue v10) k2 k1))))) | |
| 406 (InvokeContinuation k0 (v0))))) | |
| 407 """; | |
| 408 String CP9_OUT = """ | |
| 409 (FunctionDefinition main () () return | |
| 410 (LetPrim (v0 (Constant (Int 1))) | |
| 411 (LetCont | |
| 412 ((rec k0 (v1) | |
| 413 (LetCont | |
| 414 ((k1 () | |
| 415 (InvokeContinuation return (v1))) | |
| 416 (k2 () | |
| 417 (LetPrim (v2 (Constant (Int 1))) | |
| 418 (LetCont | |
| 419 ((k3 (v3) | |
| 420 (LetCont | |
| 421 ((k4 (v4) | |
| 422 (LetCont | |
| 423 ((k5 () | |
| 424 (LetPrim (v5 (Constant (Int 42))) | |
| 425 (InvokeContinuation return (v5)))) | |
| 426 (k6 () | |
| 427 (LetPrim (v6 (Constant (Int 1))) | |
| 428 (LetCont | |
| 429 ((k7 (v7) | |
| 430 (InvokeContinuation rec k0 (v7)
))) | |
| 431 (InvokeMethod v1 + (v6) k7))))) | |
| 432 (Branch (IsTrue v4) k5 k6)))) | |
| 433 (LetCont | |
| 434 ((k8 () | |
| 435 (LetPrim (v8 (Constant (Bool false))) | |
| 436 (InvokeContinuation k4 (v8)))) | |
| 437 (k9 () | |
| 438 (LetPrim (v9 (Constant (Bool true))) | |
| 439 (InvokeContinuation k4 (v9))))) | |
| 440 (Branch (IsTrue v3) k8 k9))))) | |
| 441 (InvokeMethod v1 == (v2) k3))))) | |
| 442 (LetPrim (v10 (Constant (Bool true))) | |
| 443 (InvokeContinuation k2 ()))))) | |
| 444 (InvokeContinuation k0 (v0))))) | |
| 445 """; | |
| 446 | |
| 447 // While loop, from: | |
| 448 // | |
| 449 // int main() { | |
| 450 // for (int i = 0; i < 2; i++) { | |
| 451 // print(42 + i); | |
| 452 // } | |
| 453 // } | |
| 454 | |
| 455 String CP10_IN = """ | |
| 456 (FunctionDefinition main () () return | |
| 457 (LetPrim (v0 (Constant (Int 0))) | |
| 458 (LetCont | |
| 459 ((rec k0 (v1) | |
| 460 (LetCont | |
| 461 ((k1 () | |
| 462 (LetPrim (v2 (Constant (Null))) | |
| 463 (InvokeContinuation return (v2)))) | |
| 464 (k2 () | |
| 465 (LetPrim (v3 (Constant (Int 42))) | |
| 466 (LetCont | |
| 467 ((k3 (v4) | |
| 468 (LetCont | |
| 469 ((k4 (v5) | |
| 470 (LetPrim (v6 (Constant (Int 1))) | |
| 471 (LetCont | |
| 472 ((k5 (v7) | |
| 473 (InvokeContinuation rec k0 (v7)))) | |
| 474 (InvokeMethod v1 + (v6) k5))))) | |
| 475 (InvokeStatic print (v4) k4)))) | |
| 476 (InvokeMethod v3 + (v1) k3))))) | |
| 477 (LetPrim (v8 (Constant (Int 2))) | |
| 478 (LetCont | |
| 479 ((k6 (v9) | |
| 480 (Branch (IsTrue v9) k2 k1))) | |
| 481 (InvokeMethod v1 < (v8) k6)))))) | |
| 482 (InvokeContinuation k0 (v0))))) | |
| 483 """; | |
| 484 String CP10_OUT = CP10_IN; | |
| 485 | |
| 486 /// Normalizes whitespace by replacing all whitespace sequences by a single | |
| 487 /// space and trimming leading and trailing whitespace. | |
| 488 String normalizeSExpr(String input) { | |
| 489 return input.replaceAll(new RegExp(r'[ \n\t]+'), ' ').trim(); | |
| 490 } | |
| 491 | |
| 492 /// Parses the given input IR, runs an optimization pass over it, and compares | |
| 493 /// the stringification of the result against the expected output. | |
| 494 Future testConstantPropagator(String input, String expectedOutput) { | |
| 495 final compiler = new MockCompiler.internal( | |
| 496 emitJavaScript: false, | |
| 497 enableMinification: false); | |
| 498 return compiler.init().then((_) { | |
| 499 final unstringifier = new SExpressionUnstringifier(); | |
| 500 final stringifier = new SExpressionStringifier(); | |
| 501 final optimizer = new TypePropagator( | |
| 502 compiler.types, | |
| 503 DART_CONSTANT_SYSTEM, | |
| 504 new UnitTypeSystem(), | |
| 505 compiler.internalError); | |
| 506 | |
| 507 final f = unstringifier.unstringify(input); | |
| 508 optimizer.rewrite(f); | |
| 509 | |
| 510 String expected = normalizeSExpr(expectedOutput); | |
| 511 String actual = normalizeSExpr(stringifier.visit(f)); | |
| 512 | |
| 513 Expect.equals(expected, actual); | |
| 514 }); | |
| 515 } | |
| 516 | |
| 517 void main() { | |
| 518 asyncTest(() => testConstantPropagator(CP1_IN, CP1_OUT)); | |
| 519 asyncTest(() => testConstantPropagator(CP2_IN, CP2_OUT)); | |
| 520 asyncTest(() => testConstantPropagator(CP3_IN, CP3_OUT)); | |
| 521 asyncTest(() => testConstantPropagator(CP4_IN, CP4_OUT)); | |
| 522 asyncTest(() => testConstantPropagator(CP5_IN, CP5_OUT)); | |
| 523 asyncTest(() => testConstantPropagator(CP6_IN, CP6_OUT)); | |
| 524 asyncTest(() => testConstantPropagator(CP7_IN, CP7_OUT)); | |
| 525 asyncTest(() => testConstantPropagator(CP8_IN, CP8_OUT)); | |
| 526 asyncTest(() => testConstantPropagator(CP9_IN, CP9_OUT)); | |
| 527 asyncTest(() => testConstantPropagator(CP10_IN, CP10_OUT)); | |
| 528 } | |
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Chromium Code Reviews
Issue 2213673002:
Delete dart_backend from compiler. (Closed)
Base URL: git@github.com:dart-lang/sdk.git@master