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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_MIPS) 6 #if defined(TARGET_ARCH_MIPS)
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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540 __ Pop(V1); // Restore stacktrace. 540 __ Pop(V1); // Restore stacktrace.
541 __ Pop(V0); // Restore exception. 541 __ Pop(V0); // Restore exception.
542 } 542 }
543 __ LeaveStubFrame(); 543 __ LeaveStubFrame();
544 // Remove materialization arguments. 544 // Remove materialization arguments.
545 __ SmiUntag(T1); 545 __ SmiUntag(T1);
546 __ addu(SP, SP, T1); 546 __ addu(SP, SP, T1);
547 __ Ret(); 547 __ Ret();
548 } 548 }
549 549
550 // RA: return address + call-instruction-size
551 // V0: result, must be preserved 550 // V0: result, must be preserved
552 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) { 551 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) {
553 // Correct return address to point just after the call that is being
554 // deoptimized.
555 __ AddImmediate(RA, -CallPattern::kDeoptCallLengthInBytes);
556 // Push zap value instead of CODE_REG for lazy deopt. 552 // Push zap value instead of CODE_REG for lazy deopt.
557 __ LoadImmediate(TMP, 0xf1f1f1f1); 553 __ LoadImmediate(TMP, 0xf1f1f1f1);
558 __ Push(TMP); 554 __ Push(TMP);
555 // Return address for "call" to deopt stub.
556 __ LoadImmediate(RA, 0xe1e1e1e1);
557 __ lw(CODE_REG, Address(THR, Thread::lazy_deopt_from_return_stub_offset()));
559 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn); 558 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
560 } 559 }
561 560
562 561
563 // RA: return address + call-instruction-size
564 // V0: exception, must be preserved 562 // V0: exception, must be preserved
565 // V1: stacktrace, must be preserved 563 // V1: stacktrace, must be preserved
566 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) { 564 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) {
567 // Correct return address to point just after the call that is being
568 // deoptimized.
569 __ AddImmediate(RA, -CallPattern::kDeoptCallLengthInBytes);
570 // Push zap value instead of CODE_REG for lazy deopt. 565 // Push zap value instead of CODE_REG for lazy deopt.
571 __ LoadImmediate(TMP, 0xf1f1f1f1); 566 __ LoadImmediate(TMP, 0xf1f1f1f1);
572 __ Push(TMP); 567 __ Push(TMP);
568 // Return address for "call" to deopt stub.
569 __ LoadImmediate(RA, 0xe1e1e1e1);
570 __ lw(CODE_REG, Address(THR, Thread::lazy_deopt_from_throw_stub_offset()));
573 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow); 571 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
574 } 572 }
575 573
576 574
577 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) { 575 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
578 GenerateDeoptimizationSequence(assembler, kEagerDeopt); 576 GenerateDeoptimizationSequence(assembler, kEagerDeopt);
579 } 577 }
580 578
581 579
582 static void GenerateDispatcherCode(Assembler* assembler, 580 static void GenerateDispatcherCode(Assembler* assembler,
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2391 } 2389 }
2392 2390
2393 2391
2394 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) { 2392 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
2395 __ break_(0); 2393 __ break_(0);
2396 } 2394 }
2397 2395
2398 } // namespace dart 2396 } // namespace dart
2399 2397
2400 #endif // defined TARGET_ARCH_MIPS 2398 #endif // defined TARGET_ARCH_MIPS
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