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Issue 2392613002: Reapply "Lazy deopt without code patching." (Closed)
Patch Set: . Created 4 years, 2 months ago
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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file 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 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_ARM64) 6 #if defined(TARGET_ARCH_ARM64)
7 7
8 #include "vm/assembler.h" 8 #include "vm/assembler.h"
9 #include "vm/code_generator.h" 9 #include "vm/code_generator.h"
10 #include "vm/compiler.h" 10 #include "vm/compiler.h"
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550 __ Pop(R1); // Restore stacktrace. 550 __ Pop(R1); // Restore stacktrace.
551 __ Pop(R0); // Restore exception. 551 __ Pop(R0); // Restore exception.
552 } 552 }
553 __ LeaveStubFrame(); 553 __ LeaveStubFrame();
554 // Remove materialization arguments. 554 // Remove materialization arguments.
555 __ add(SP, SP, Operand(R2)); 555 __ add(SP, SP, Operand(R2));
556 __ ret(); 556 __ ret();
557 } 557 }
558 558
559 559
560 // LR: return address + call-instruction-size
561 // R0: result, must be preserved 560 // R0: result, must be preserved
562 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) { 561 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) {
563 // Correct return address to point just after the call that is being
564 // deoptimized.
565 __ AddImmediate(LR, LR, -CallPattern::kDeoptCallLengthInBytes);
566 // Push zap value instead of CODE_REG for lazy deopt. 562 // Push zap value instead of CODE_REG for lazy deopt.
567 __ LoadImmediate(TMP, 0xf1f1f1f1); 563 __ LoadImmediate(TMP, 0xf1f1f1f1);
568 __ Push(TMP); 564 __ Push(TMP);
565 // Return address for "call" to deopt stub.
566 __ LoadImmediate(LR, 0xe1e1e1e1);
567 __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_return_stub_offset()));
569 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn); 568 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
570 } 569 }
571 570
572 571
573 // LR: return address + call-instruction-size
574 // R0: exception, must be preserved 572 // R0: exception, must be preserved
575 // R1: stacktrace, must be preserved 573 // R1: stacktrace, must be preserved
576 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) { 574 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) {
577 // Correct return address to point just after the call that is being
578 // deoptimized.
579 __ AddImmediate(LR, LR, -CallPattern::kDeoptCallLengthInBytes);
580 // Push zap value instead of CODE_REG for lazy deopt. 575 // Push zap value instead of CODE_REG for lazy deopt.
581 __ LoadImmediate(TMP, 0xf1f1f1f1); 576 __ LoadImmediate(TMP, 0xf1f1f1f1);
582 __ Push(TMP); 577 __ Push(TMP);
578 // Return address for "call" to deopt stub.
579 __ LoadImmediate(LR, 0xe1e1e1e1);
580 __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_throw_stub_offset()));
583 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow); 581 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
584 } 582 }
585 583
586 584
587 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) { 585 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
588 GenerateDeoptimizationSequence(assembler, kEagerDeopt); 586 GenerateDeoptimizationSequence(assembler, kEagerDeopt);
589 } 587 }
590 588
591 589
592 static void GenerateDispatcherCode(Assembler* assembler, 590 static void GenerateDispatcherCode(Assembler* assembler,
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2314 } 2312 }
2315 2313
2316 2314
2317 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) { 2315 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
2318 __ brk(0); 2316 __ brk(0);
2319 } 2317 }
2320 2318
2321 } // namespace dart 2319 } // namespace dart
2322 2320
2323 #endif // defined TARGET_ARCH_ARM64 2321 #endif // defined TARGET_ARCH_ARM64
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