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Issue 2523053002: Implement rewind: drop one or more frames from the debugger. (Closed)
Patch Set: code review Created 4 years, 1 month 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_ARM) 6 #if defined(TARGET_ARCH_ARM)
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/cpu.h" 10 #include "vm/cpu.h"
(...skipping 519 matching lines...) Expand 10 before | Expand all | Expand 10 after
530 __ Pop(R2); 530 __ Pop(R2);
531 if (kind == kLazyDeoptFromReturn) { 531 if (kind == kLazyDeoptFromReturn) {
532 __ Pop(R0); // Restore result. 532 __ Pop(R0); // Restore result.
533 } else if (kind == kLazyDeoptFromThrow) { 533 } else if (kind == kLazyDeoptFromThrow) {
534 __ Pop(R1); // Restore stacktrace. 534 __ Pop(R1); // Restore stacktrace.
535 __ Pop(R0); // Restore exception. 535 __ Pop(R0); // Restore exception.
536 } 536 }
537 __ LeaveStubFrame(); 537 __ LeaveStubFrame();
538 // Remove materialization arguments. 538 // Remove materialization arguments.
539 __ add(SP, SP, Operand(R2, ASR, kSmiTagSize)); 539 __ add(SP, SP, Operand(R2, ASR, kSmiTagSize));
540 __ Ret(); 540 // The caller is responsible for emitting the return instruction.
541 } 541 }
542 542
543 543
544 // R0: result, must be preserved 544 // R0: result, must be preserved
545 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) { 545 void StubCode::GenerateDeoptimizeLazyFromReturnStub(Assembler* assembler) {
546 // Push zap value instead of CODE_REG for lazy deopt. 546 // Push zap value instead of CODE_REG for lazy deopt.
547 __ LoadImmediate(IP, 0xf1f1f1f1); 547 __ LoadImmediate(IP, kZapCodeReg);
548 __ Push(IP); 548 __ Push(IP);
549 // Return address for "call" to deopt stub. 549 // Return address for "call" to deopt stub.
550 __ LoadImmediate(LR, 0xe1e1e1e1); 550 __ LoadImmediate(LR, kZapReturnAddress);
551 __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_return_stub_offset())); 551 __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_return_stub_offset()));
552 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn); 552 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromReturn);
553 __ Ret();
553 } 554 }
554 555
555 556
556 // R0: exception, must be preserved 557 // R0: exception, must be preserved
557 // R1: stacktrace, must be preserved 558 // R1: stacktrace, must be preserved
558 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) { 559 void StubCode::GenerateDeoptimizeLazyFromThrowStub(Assembler* assembler) {
559 // Push zap value instead of CODE_REG for lazy deopt. 560 // Push zap value instead of CODE_REG for lazy deopt.
560 __ LoadImmediate(IP, 0xf1f1f1f1); 561 __ LoadImmediate(IP, kZapCodeReg);
561 __ Push(IP); 562 __ Push(IP);
562 // Return address for "call" to deopt stub. 563 // Return address for "call" to deopt stub.
563 __ LoadImmediate(LR, 0xe1e1e1e1); 564 __ LoadImmediate(LR, kZapReturnAddress);
564 __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_throw_stub_offset())); 565 __ ldr(CODE_REG, Address(THR, Thread::lazy_deopt_from_throw_stub_offset()));
565 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow); 566 GenerateDeoptimizationSequence(assembler, kLazyDeoptFromThrow);
567 __ Ret();
566 } 568 }
567 569
568 570
569 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) { 571 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) {
570 GenerateDeoptimizationSequence(assembler, kEagerDeopt); 572 GenerateDeoptimizationSequence(assembler, kEagerDeopt);
573 __ Ret();
571 } 574 }
572 575
573 576
574 static void GenerateDispatcherCode(Assembler* assembler, 577 static void GenerateDispatcherCode(Assembler* assembler,
575 Label* call_target_function) { 578 Label* call_target_function) {
576 __ Comment("NoSuchMethodDispatch"); 579 __ Comment("NoSuchMethodDispatch");
577 // When lazily generated invocation dispatchers are disabled, the 580 // When lazily generated invocation dispatchers are disabled, the
578 // miss-handler may return null. 581 // miss-handler may return null.
579 __ CompareObject(R0, Object::null_object()); 582 __ CompareObject(R0, Object::null_object());
580 __ b(call_target_function, NE); 583 __ b(call_target_function, NE);
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1892 __ StoreToOffset(kWord, R2, THR, Thread::active_exception_offset()); 1895 __ StoreToOffset(kWord, R2, THR, Thread::active_exception_offset());
1893 1896
1894 // Stacktrace object. 1897 // Stacktrace object.
1895 __ LoadFromOffset(kWord, R1, THR, Thread::active_stacktrace_offset()); 1898 __ LoadFromOffset(kWord, R1, THR, Thread::active_stacktrace_offset());
1896 __ StoreToOffset(kWord, R2, THR, Thread::active_stacktrace_offset()); 1899 __ StoreToOffset(kWord, R2, THR, Thread::active_stacktrace_offset());
1897 1900
1898 __ bx(LR); // Jump to the exception handler code. 1901 __ bx(LR); // Jump to the exception handler code.
1899 } 1902 }
1900 1903
1901 1904
1905 // Deoptimize a frame on the call stack before rewinding.
1906 // The arguments are stored in the Thread object.
1907 // No result.
1908 void StubCode::GenerateDeoptForRewindStub(Assembler* assembler) {
1909 // Push zap value instead of CODE_REG.
1910 __ LoadImmediate(IP, kZapCodeReg);
1911 __ Push(IP);
1912
1913 // Load the deopt pc into LR.
1914 __ LoadFromOffset(kWord, LR, THR, Thread::resume_pc_offset());
1915 GenerateDeoptimizationSequence(assembler, kEagerDeopt);
1916
1917 // After we have deoptimized, jump to the correct frame.
1918 __ EnterStubFrame();
1919 __ CallRuntime(kRewindPostDeoptRuntimeEntry, 0);
1920 __ LeaveStubFrame();
1921 __ bkpt(0);
1922 }
1923
1924
1902 // Calls to the runtime to optimize the given function. 1925 // Calls to the runtime to optimize the given function.
1903 // R8: function to be reoptimized. 1926 // R8: function to be reoptimized.
1904 // R4: argument descriptor (preserved). 1927 // R4: argument descriptor (preserved).
1905 void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) { 1928 void StubCode::GenerateOptimizeFunctionStub(Assembler* assembler) {
1906 __ EnterStubFrame(); 1929 __ EnterStubFrame();
1907 __ Push(R4); 1930 __ Push(R4);
1908 __ LoadImmediate(IP, 0); 1931 __ LoadImmediate(IP, 0);
1909 __ Push(IP); // Setup space on stack for return value. 1932 __ Push(IP); // Setup space on stack for return value.
1910 __ Push(R8); 1933 __ Push(R8);
1911 __ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1); 1934 __ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry, 1);
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2258 } 2281 }
2259 2282
2260 2283
2261 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) { 2284 void StubCode::GenerateFrameAwaitingMaterializationStub(Assembler* assembler) {
2262 __ bkpt(0); 2285 __ bkpt(0);
2263 } 2286 }
2264 2287
2265 } // namespace dart 2288 } // namespace dart
2266 2289
2267 #endif // defined TARGET_ARCH_ARM 2290 #endif // defined TARGET_ARCH_ARM
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