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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" |
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21 #define __ assembler-> | 21 #define __ assembler-> |
22 | 22 |
23 namespace dart { | 23 namespace dart { |
24 | 24 |
25 DEFINE_FLAG(bool, inline_alloc, true, "Inline allocation of objects."); | 25 DEFINE_FLAG(bool, inline_alloc, true, "Inline allocation of objects."); |
26 DEFINE_FLAG(bool, use_slow_path, false, | 26 DEFINE_FLAG(bool, use_slow_path, false, |
27 "Set to true for debugging & verifying the slow paths."); | 27 "Set to true for debugging & verifying the slow paths."); |
28 DECLARE_FLAG(bool, trace_optimized_ic_calls); | 28 DECLARE_FLAG(bool, trace_optimized_ic_calls); |
29 DECLARE_FLAG(int, optimization_counter_threshold); | 29 DECLARE_FLAG(int, optimization_counter_threshold); |
30 DECLARE_FLAG(bool, support_debugger); | 30 DECLARE_FLAG(bool, support_debugger); |
| 31 DECLARE_FLAG(bool, lazy_dispatchers); |
31 | 32 |
32 // Input parameters: | 33 // Input parameters: |
33 // LR : return address. | 34 // LR : return address. |
34 // SP : address of last argument in argument array. | 35 // SP : address of last argument in argument array. |
35 // SP + 4*R4 - 4 : address of first argument in argument array. | 36 // SP + 4*R4 - 4 : address of first argument in argument array. |
36 // SP + 4*R4 : address of return value. | 37 // SP + 4*R4 : address of return value. |
37 // R5 : address of the runtime function to call. | 38 // R5 : address of the runtime function to call. |
38 // R4 : number of arguments to the call. | 39 // R4 : number of arguments to the call. |
39 void StubCode::GenerateCallToRuntimeStub(Assembler* assembler) { | 40 void StubCode::GenerateCallToRuntimeStub(Assembler* assembler) { |
40 const intptr_t thread_offset = NativeArguments::thread_offset(); | 41 const intptr_t thread_offset = NativeArguments::thread_offset(); |
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547 __ AddImmediate(LR, -CallPattern::LengthInBytes()); | 548 __ AddImmediate(LR, -CallPattern::LengthInBytes()); |
548 GenerateDeoptimizationSequence(assembler, true); // Preserve R0. | 549 GenerateDeoptimizationSequence(assembler, true); // Preserve R0. |
549 } | 550 } |
550 | 551 |
551 | 552 |
552 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) { | 553 void StubCode::GenerateDeoptimizeStub(Assembler* assembler) { |
553 GenerateDeoptimizationSequence(assembler, false); // Don't preserve R0. | 554 GenerateDeoptimizationSequence(assembler, false); // Don't preserve R0. |
554 } | 555 } |
555 | 556 |
556 | 557 |
| 558 static void GenerateDispatcherCode(Assembler* assembler, |
| 559 Label* call_target_function) { |
| 560 __ Comment("NoSuchMethodDispatch"); |
| 561 // When lazily generated invocation dispatchers are disabled, the |
| 562 // miss-handler may return null. |
| 563 __ CompareObject(R0, Object::null_object()); |
| 564 __ b(call_target_function, NE); |
| 565 __ EnterStubFrame(); |
| 566 // Load the receiver. |
| 567 __ ldr(R2, FieldAddress(R4, ArgumentsDescriptor::count_offset())); |
| 568 __ add(IP, FP, Operand(R2, LSL, 1)); // R2 is Smi. |
| 569 __ ldr(R6, Address(IP, kParamEndSlotFromFp * kWordSize)); |
| 570 __ PushObject(Object::null_object()); |
| 571 __ Push(R6); |
| 572 __ Push(R5); |
| 573 __ Push(R4); |
| 574 // R2: Smi-tagged arguments array length. |
| 575 PushArgumentsArray(assembler); |
| 576 const intptr_t kNumArgs = 4; |
| 577 __ CallRuntime(kInvokeNoSuchMethodDispatcherRuntimeEntry, kNumArgs); |
| 578 __ Drop(4); |
| 579 __ Pop(R0); // Return value. |
| 580 __ LeaveStubFrame(); |
| 581 __ Ret(); |
| 582 } |
| 583 |
| 584 |
557 void StubCode::GenerateMegamorphicMissStub(Assembler* assembler) { | 585 void StubCode::GenerateMegamorphicMissStub(Assembler* assembler) { |
558 __ EnterStubFrame(); | 586 __ EnterStubFrame(); |
559 | 587 |
560 // Load the receiver. | 588 // Load the receiver. |
561 __ ldr(R2, FieldAddress(R4, ArgumentsDescriptor::count_offset())); | 589 __ ldr(R2, FieldAddress(R4, ArgumentsDescriptor::count_offset())); |
562 __ add(IP, FP, Operand(R2, LSL, 1)); // R2 is Smi. | 590 __ add(IP, FP, Operand(R2, LSL, 1)); // R2 is Smi. |
563 __ ldr(R6, Address(IP, kParamEndSlotFromFp * kWordSize)); | 591 __ ldr(R6, Address(IP, kParamEndSlotFromFp * kWordSize)); |
564 | 592 |
565 // Preserve IC data and arguments descriptor. | 593 // Preserve IC data and arguments descriptor. |
566 __ PushList((1 << R4) | (1 << R5)); | 594 __ PushList((1 << R4) | (1 << R5)); |
567 | 595 |
568 // Push space for the return value. | 596 // Push space for the return value. |
569 // Push the receiver. | 597 // Push the receiver. |
570 // Push IC data object. | 598 // Push IC data object. |
571 // Push arguments descriptor array. | 599 // Push arguments descriptor array. |
572 __ LoadImmediate(IP, reinterpret_cast<intptr_t>(Object::null())); | 600 __ LoadImmediate(IP, reinterpret_cast<intptr_t>(Object::null())); |
573 __ PushList((1 << R4) | (1 << R5) | (1 << R6) | (1 << IP)); | 601 __ PushList((1 << R4) | (1 << R5) | (1 << R6) | (1 << IP)); |
574 __ CallRuntime(kMegamorphicCacheMissHandlerRuntimeEntry, 3); | 602 __ CallRuntime(kMegamorphicCacheMissHandlerRuntimeEntry, 3); |
575 // Remove arguments. | 603 // Remove arguments. |
576 __ Drop(3); | 604 __ Drop(3); |
577 __ Pop(R0); // Get result into R0 (target function). | 605 __ Pop(R0); // Get result into R0 (target function). |
578 | 606 |
579 // Restore IC data and arguments descriptor. | 607 // Restore IC data and arguments descriptor. |
580 __ PopList((1 << R4) | (1 << R5)); | 608 __ PopList((1 << R4) | (1 << R5)); |
581 | 609 |
582 __ LeaveStubFrame(); | 610 __ LeaveStubFrame(); |
583 | 611 |
| 612 if (!FLAG_lazy_dispatchers) { |
| 613 Label call_target_function; |
| 614 GenerateDispatcherCode(assembler, &call_target_function); |
| 615 __ Bind(&call_target_function); |
| 616 } |
| 617 |
584 // Tail-call to target function. | 618 // Tail-call to target function. |
585 __ ldr(R2, FieldAddress(R0, Function::instructions_offset())); | 619 __ ldr(R2, FieldAddress(R0, Function::instructions_offset())); |
586 __ AddImmediate(R2, Instructions::HeaderSize() - kHeapObjectTag); | 620 __ AddImmediate(R2, Instructions::HeaderSize() - kHeapObjectTag); |
587 __ bx(R2); | 621 __ bx(R2); |
588 } | 622 } |
589 | 623 |
590 | 624 |
591 // Called for inline allocation of arrays. | 625 // Called for inline allocation of arrays. |
592 // Input parameters: | 626 // Input parameters: |
593 // LR: return address. | 627 // LR: return address. |
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1439 // Pass IC data object. | 1473 // Pass IC data object. |
1440 __ Push(R5); | 1474 __ Push(R5); |
1441 __ CallRuntime(handle_ic_miss, num_args + 1); | 1475 __ CallRuntime(handle_ic_miss, num_args + 1); |
1442 // Remove the call arguments pushed earlier, including the IC data object. | 1476 // Remove the call arguments pushed earlier, including the IC data object. |
1443 __ Drop(num_args + 1); | 1477 __ Drop(num_args + 1); |
1444 // Pop returned function object into R0. | 1478 // Pop returned function object into R0. |
1445 // Restore arguments descriptor array and IC data array. | 1479 // Restore arguments descriptor array and IC data array. |
1446 __ PopList((1 << R0) | (1 << R4) | (1 << R5)); | 1480 __ PopList((1 << R0) | (1 << R4) | (1 << R5)); |
1447 __ LeaveStubFrame(); | 1481 __ LeaveStubFrame(); |
1448 Label call_target_function; | 1482 Label call_target_function; |
1449 __ b(&call_target_function); | 1483 if (!FLAG_lazy_dispatchers) { |
| 1484 GenerateDispatcherCode(assembler, &call_target_function); |
| 1485 } else { |
| 1486 __ b(&call_target_function); |
| 1487 } |
1450 | 1488 |
1451 __ Bind(&found); | 1489 __ Bind(&found); |
1452 // R6: pointer to an IC data check group. | 1490 // R6: pointer to an IC data check group. |
1453 const intptr_t target_offset = ICData::TargetIndexFor(num_args) * kWordSize; | 1491 const intptr_t target_offset = ICData::TargetIndexFor(num_args) * kWordSize; |
1454 const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize; | 1492 const intptr_t count_offset = ICData::CountIndexFor(num_args) * kWordSize; |
1455 __ LoadFromOffset(kWord, R0, R6, target_offset); | 1493 __ LoadFromOffset(kWord, R0, R6, target_offset); |
1456 | 1494 |
1457 if (FLAG_optimization_counter_threshold >= 0) { | 1495 if (FLAG_optimization_counter_threshold >= 0) { |
1458 __ Comment("Update caller's counter"); | 1496 __ Comment("Update caller's counter"); |
1459 __ LoadFromOffset(kWord, R1, R6, count_offset); | 1497 __ LoadFromOffset(kWord, R1, R6, count_offset); |
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2084 // Result: | 2122 // Result: |
2085 // R1: entry point. | 2123 // R1: entry point. |
2086 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) { | 2124 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) { |
2087 EmitMegamorphicLookup(assembler, R0, R1, R1); | 2125 EmitMegamorphicLookup(assembler, R0, R1, R1); |
2088 __ Ret(); | 2126 __ Ret(); |
2089 } | 2127 } |
2090 | 2128 |
2091 } // namespace dart | 2129 } // namespace dart |
2092 | 2130 |
2093 #endif // defined TARGET_ARCH_ARM | 2131 #endif // defined TARGET_ARCH_ARM |
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