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Issue 2380403003: Lazy deopt without code patching. (Closed)
Patch Set: remove tracing register assignment Created 4 years, 2 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 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. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #include "vm/globals.h" 5 #include "vm/globals.h"
6 #if defined(TARGET_ARCH_X64) 6 #if defined(TARGET_ARCH_X64)
7 7
8 #include "vm/assembler.h" 8 #include "vm/assembler.h"
9 #include "vm/compiler.h" 9 #include "vm/compiler.h"
10 #include "vm/dart_entry.h" 10 #include "vm/dart_entry.h"
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490 } 490 }
491 __ LeaveStubFrame(); 491 __ LeaveStubFrame();
492 492
493 __ popq(RCX); // Pop return address. 493 __ popq(RCX); // Pop return address.
494 __ addq(RSP, RBX); // Remove materialization arguments. 494 __ addq(RSP, RBX); // Remove materialization arguments.
495 __ pushq(RCX); // Push return address. 495 __ pushq(RCX); // Push return address.
496 __ ret(); 496 __ ret();
497 } 497 }
498 498
499 499
500 // TOS: return address + call-instruction-size (5 bytes).
501 // RAX: result, must be preserved 500 // RAX: result, must be preserved
502 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) { 501 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) {
503 // Correct return address to point just after the call that is being
504 // deoptimized.
505 __ popq(RBX);
506 __ subq(RBX, Immediate(ShortCallPattern::pattern_length_in_bytes()));
507 // Push zap value instead of CODE_REG for lazy deopt. 502 // Push zap value instead of CODE_REG for lazy deopt.
508 __ pushq(Immediate(0xf1f1f1f1)); 503 __ pushq(Immediate(0xf1f1f1f1));
509 __ pushq(RBX); 504 // Return address for "call" to deopt stub.
505 __ pushq(Immediate(0xe1e1e1e1));
506 __ movq(CODE_REG, Address(THR, Thread::lazy_deopt_from_return_stub_offset()));
510 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn); 507 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
511 } 508 }
512 509
513 510
514 // TOS: return address + call-instruction-size (5 bytes).
515 // RAX: exception, must be preserved 511 // RAX: exception, must be preserved
516 // RDX: stacktrace, must be preserved 512 // RDX: stacktrace, must be preserved
517 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) { 513 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) {
518 // Correct return address to point just after the call that is being
519 // deoptimized.
520 __ popq(RBX);
521 __ subq(RBX, Immediate(ShortCallPattern::pattern_length_in_bytes()));
522 // Push zap value instead of CODE_REG for lazy deopt. 514 // Push zap value instead of CODE_REG for lazy deopt.
523 __ pushq(Immediate(0xf1f1f1f1)); 515 __ pushq(Immediate(0xf1f1f1f1));
524 __ pushq(RBX); 516 // Return address for "call" to deopt stub.
517 __ pushq(Immediate(0xe1e1e1e1));
518 __ movq(CODE_REG, Address(THR, Thread::lazy_deopt_from_throw_stub_offset()));
525 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow); 519 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
526 } 520 }
527 521
528 522
529 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) { 523 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
530 GenerateDeoptimizationSequence(assembler, kEagerDeopt); 524 GenerateDeoptimizationSequence(assembler, kEagerDeopt);
531 } 525 }
532 526
533 527
534 static void GenerateDispatcherCode(Assembler* assembler, 528 static void GenerateDispatcherCode(Assembler* assembler,
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2283 } 2277 }
2284 2278
2285 2279
2286 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) { 2280 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
2287 __ int3(); 2281 __ int3();
2288 } 2282 }
2289 2283
2290 } // namespace dart 2284 } // namespace dart
2291 2285
2292 #endif // defined TARGET_ARCH_X64 2286 #endif // defined TARGET_ARCH_X64
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