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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_COMPILER_FRAME_H_ | 5 #ifndef V8_COMPILER_FRAME_H_ |
6 #define V8_COMPILER_FRAME_H_ | 6 #define V8_COMPILER_FRAME_H_ |
7 | 7 |
8 #include "src/bit-vector.h" | 8 #include "src/bit-vector.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
11 namespace internal { | 11 namespace internal { |
12 namespace compiler { | 12 namespace compiler { |
13 | 13 |
14 // Collects the spill slot requirements and the allocated general and double | 14 // Collects the spill slot requirements and the allocated general and double |
15 // registers for a compiled function. Frames are usually populated by the | 15 // registers for a compiled function. Frames are usually populated by the |
16 // register allocator and are used by Linkage to generate code for the prologue | 16 // register allocator and are used by Linkage to generate code for the prologue |
17 // and epilogue to compiled code. | 17 // and epilogue to compiled code. |
18 class Frame : public ZoneObject { | 18 class Frame : public ZoneObject { |
19 public: | 19 public: |
20 Frame() | 20 Frame() |
21 : register_save_area_size_(0), | 21 : register_save_area_size_(0), |
22 spill_slot_count_(0), | 22 spill_slot_count_(0), |
23 double_spill_slot_count_(0), | |
24 osr_stack_slot_count_(0), | 23 osr_stack_slot_count_(0), |
25 allocated_registers_(NULL), | 24 allocated_registers_(NULL), |
26 allocated_double_registers_(NULL) {} | 25 allocated_double_registers_(NULL) {} |
27 | 26 |
28 inline int GetSpillSlotCount() { return spill_slot_count_; } | 27 inline int GetSpillSlotCount() { return spill_slot_count_; } |
29 inline int GetDoubleSpillSlotCount() { return double_spill_slot_count_; } | |
30 | 28 |
31 void SetAllocatedRegisters(BitVector* regs) { | 29 void SetAllocatedRegisters(BitVector* regs) { |
32 DCHECK(allocated_registers_ == NULL); | 30 DCHECK(allocated_registers_ == NULL); |
33 allocated_registers_ = regs; | 31 allocated_registers_ = regs; |
34 } | 32 } |
35 | 33 |
36 void SetAllocatedDoubleRegisters(BitVector* regs) { | 34 void SetAllocatedDoubleRegisters(BitVector* regs) { |
37 DCHECK(allocated_double_registers_ == NULL); | 35 DCHECK(allocated_double_registers_ == NULL); |
38 allocated_double_registers_ = regs; | 36 allocated_double_registers_ = regs; |
39 } | 37 } |
(...skipping 10 matching lines...) Expand all Loading... |
50 int GetRegisterSaveAreaSize() { return register_save_area_size_; } | 48 int GetRegisterSaveAreaSize() { return register_save_area_size_; } |
51 | 49 |
52 // OSR stack slots, including locals and expression stack slots. | 50 // OSR stack slots, including locals and expression stack slots. |
53 void SetOsrStackSlotCount(int slots) { | 51 void SetOsrStackSlotCount(int slots) { |
54 DCHECK(slots >= 0); | 52 DCHECK(slots >= 0); |
55 osr_stack_slot_count_ = slots; | 53 osr_stack_slot_count_ = slots; |
56 } | 54 } |
57 | 55 |
58 int GetOsrStackSlotCount() { return osr_stack_slot_count_; } | 56 int GetOsrStackSlotCount() { return osr_stack_slot_count_; } |
59 | 57 |
60 int AllocateSpillSlot(bool is_double) { | 58 int AllocateSpillSlot(int width) { |
61 // If 32-bit, skip one if the new slot is a double. | 59 DCHECK(width == 4 || width == 8); |
62 if (is_double) { | 60 // Skip one slot if necessary. |
63 if (kDoubleSize > kPointerSize) { | 61 if (width > kPointerSize) { |
64 DCHECK(kDoubleSize == kPointerSize * 2); | 62 DCHECK(width == kPointerSize * 2); |
65 spill_slot_count_++; | 63 spill_slot_count_++; |
66 spill_slot_count_ |= 1; | 64 spill_slot_count_ |= 1; |
67 } | |
68 double_spill_slot_count_++; | |
69 } | 65 } |
70 return spill_slot_count_++; | 66 return spill_slot_count_++; |
71 } | 67 } |
72 | 68 |
73 void ReserveSpillSlots(size_t slot_count) { | 69 void ReserveSpillSlots(size_t slot_count) { |
74 DCHECK_EQ(0, spill_slot_count_); // can only reserve before allocation. | 70 DCHECK_EQ(0, spill_slot_count_); // can only reserve before allocation. |
75 spill_slot_count_ = static_cast<int>(slot_count); | 71 spill_slot_count_ = static_cast<int>(slot_count); |
76 } | 72 } |
77 | 73 |
78 private: | 74 private: |
79 int register_save_area_size_; | 75 int register_save_area_size_; |
80 int spill_slot_count_; | 76 int spill_slot_count_; |
81 int double_spill_slot_count_; | |
82 int osr_stack_slot_count_; | 77 int osr_stack_slot_count_; |
83 BitVector* allocated_registers_; | 78 BitVector* allocated_registers_; |
84 BitVector* allocated_double_registers_; | 79 BitVector* allocated_double_registers_; |
85 | 80 |
86 DISALLOW_COPY_AND_ASSIGN(Frame); | 81 DISALLOW_COPY_AND_ASSIGN(Frame); |
87 }; | 82 }; |
88 | 83 |
89 | 84 |
90 // Represents an offset from either the stack pointer or frame pointer. | 85 // Represents an offset from either the stack pointer or frame pointer. |
91 class FrameOffset { | 86 class FrameOffset { |
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110 int offset_; // Encodes SP or FP in the low order bit. | 105 int offset_; // Encodes SP or FP in the low order bit. |
111 | 106 |
112 static const int kFromSp = 1; | 107 static const int kFromSp = 1; |
113 static const int kFromFp = 0; | 108 static const int kFromFp = 0; |
114 }; | 109 }; |
115 } | 110 } |
116 } | 111 } |
117 } // namespace v8::internal::compiler | 112 } // namespace v8::internal::compiler |
118 | 113 |
119 #endif // V8_COMPILER_FRAME_H_ | 114 #endif // V8_COMPILER_FRAME_H_ |
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