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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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31 #include "v8.h" | 31 #include "v8.h" |
32 | 32 |
33 #include "allocation.h" | 33 #include "allocation.h" |
34 #include "macro-assembler.h" | 34 #include "macro-assembler.h" |
35 #include "zone-inl.h" | 35 #include "zone-inl.h" |
36 | 36 |
37 | 37 |
38 namespace v8 { | 38 namespace v8 { |
39 namespace internal { | 39 namespace internal { |
40 | 40 |
| 41 |
| 42 static inline double read_double_value(Address p) { |
| 43 #ifdef V8_HOST_CAN_READ_UNALIGNED |
| 44 return Memory::double_at(p); |
| 45 #else // V8_HOST_CAN_READ_UNALIGNED |
| 46 // Prevent gcc from using load-double (mips ldc1) on (possibly) |
| 47 // non-64-bit aligned address. |
| 48 union conversion { |
| 49 double d; |
| 50 uint32_t u[2]; |
| 51 } c; |
| 52 c.u[0] = *reinterpret_cast<uint32_t*>(p); |
| 53 c.u[1] = *reinterpret_cast<uint32_t*>(p + 4); |
| 54 return c.d; |
| 55 #endif // V8_HOST_CAN_READ_UNALIGNED |
| 56 } |
| 57 |
| 58 |
41 class FrameDescription; | 59 class FrameDescription; |
42 class TranslationIterator; | 60 class TranslationIterator; |
43 class DeoptimizingCodeListNode; | 61 class DeoptimizingCodeListNode; |
44 class DeoptimizedFrameInfo; | 62 class DeoptimizedFrameInfo; |
45 | 63 |
46 class HeapNumberMaterializationDescriptor BASE_EMBEDDED { | 64 class HeapNumberMaterializationDescriptor BASE_EMBEDDED { |
47 public: | 65 public: |
48 HeapNumberMaterializationDescriptor(Address slot_address, double val) | 66 HeapNumberMaterializationDescriptor(Address slot_address, double val) |
49 : slot_address_(slot_address), val_(val) { } | 67 : slot_address_(slot_address), val_(val) { } |
50 | 68 |
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485 JSFunction* GetFunction() const { return function_; } | 503 JSFunction* GetFunction() const { return function_; } |
486 | 504 |
487 unsigned GetOffsetFromSlotIndex(int slot_index); | 505 unsigned GetOffsetFromSlotIndex(int slot_index); |
488 | 506 |
489 intptr_t GetFrameSlot(unsigned offset) { | 507 intptr_t GetFrameSlot(unsigned offset) { |
490 return *GetFrameSlotPointer(offset); | 508 return *GetFrameSlotPointer(offset); |
491 } | 509 } |
492 | 510 |
493 double GetDoubleFrameSlot(unsigned offset) { | 511 double GetDoubleFrameSlot(unsigned offset) { |
494 intptr_t* ptr = GetFrameSlotPointer(offset); | 512 intptr_t* ptr = GetFrameSlotPointer(offset); |
495 #if V8_TARGET_ARCH_MIPS | 513 return read_double_value(reinterpret_cast<Address>(ptr)); |
496 // Prevent gcc from using load-double (mips ldc1) on (possibly) | |
497 // non-64-bit aligned double. Uses two lwc1 instructions. | |
498 union conversion { | |
499 double d; | |
500 uint32_t u[2]; | |
501 } c; | |
502 c.u[0] = *reinterpret_cast<uint32_t*>(ptr); | |
503 c.u[1] = *(reinterpret_cast<uint32_t*>(ptr) + 1); | |
504 return c.d; | |
505 #else | |
506 return *reinterpret_cast<double*>(ptr); | |
507 #endif | |
508 } | 514 } |
509 | 515 |
510 void SetFrameSlot(unsigned offset, intptr_t value) { | 516 void SetFrameSlot(unsigned offset, intptr_t value) { |
511 *GetFrameSlotPointer(offset) = value; | 517 *GetFrameSlotPointer(offset) = value; |
512 } | 518 } |
513 | 519 |
514 intptr_t GetRegister(unsigned n) const { | 520 intptr_t GetRegister(unsigned n) const { |
515 ASSERT(n < ARRAY_SIZE(registers_)); | 521 ASSERT(n < ARRAY_SIZE(registers_)); |
516 return registers_[n]; | 522 return registers_[n]; |
517 } | 523 } |
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793 case UINT32: { | 799 case UINT32: { |
794 uint32_t value = Memory::uint32_at(addr_); | 800 uint32_t value = Memory::uint32_at(addr_); |
795 if (value <= static_cast<uint32_t>(Smi::kMaxValue)) { | 801 if (value <= static_cast<uint32_t>(Smi::kMaxValue)) { |
796 return Handle<Object>(Smi::FromInt(static_cast<int>(value)), isolate); | 802 return Handle<Object>(Smi::FromInt(static_cast<int>(value)), isolate); |
797 } else { | 803 } else { |
798 return isolate->factory()->NewNumber(static_cast<double>(value)); | 804 return isolate->factory()->NewNumber(static_cast<double>(value)); |
799 } | 805 } |
800 } | 806 } |
801 | 807 |
802 case DOUBLE: { | 808 case DOUBLE: { |
803 double value = Memory::double_at(addr_); | 809 double value = read_double_value(addr_); |
804 return isolate->factory()->NewNumber(value); | 810 return isolate->factory()->NewNumber(value); |
805 } | 811 } |
806 | 812 |
807 case LITERAL: | 813 case LITERAL: |
808 return literal_; | 814 return literal_; |
809 | 815 |
810 default: | 816 default: |
811 UNREACHABLE(); | 817 UNREACHABLE(); |
812 return Handle<Object>::null(); | 818 return Handle<Object>::null(); |
813 } | 819 } |
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917 Object** expression_stack_; | 923 Object** expression_stack_; |
918 int source_position_; | 924 int source_position_; |
919 | 925 |
920 friend class Deoptimizer; | 926 friend class Deoptimizer; |
921 }; | 927 }; |
922 #endif | 928 #endif |
923 | 929 |
924 } } // namespace v8::internal | 930 } } // namespace v8::internal |
925 | 931 |
926 #endif // V8_DEOPTIMIZER_H_ | 932 #endif // V8_DEOPTIMIZER_H_ |
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