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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2016, 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 #ifndef RUNTIME_VM_STACK_FRAME_DBC_H_ | 5 #ifndef RUNTIME_VM_STACK_FRAME_DBC_H_ |
6 #define RUNTIME_VM_STACK_FRAME_DBC_H_ | 6 #define RUNTIME_VM_STACK_FRAME_DBC_H_ |
7 | 7 |
8 namespace dart { | 8 namespace dart { |
9 | 9 |
10 /* DBC Frame Layout | 10 /* DBC Frame Layout |
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36 */ | 36 */ |
37 | 37 |
38 static const int kDartFrameFixedSize = 4; // Function, Code, PC, FP | 38 static const int kDartFrameFixedSize = 4; // Function, Code, PC, FP |
39 static const int kSavedPcSlotFromSp = 3; | 39 static const int kSavedPcSlotFromSp = 3; |
40 | 40 |
41 static const int kFirstObjectSlotFromFp = -4; // Used by GC to traverse stack. | 41 static const int kFirstObjectSlotFromFp = -4; // Used by GC to traverse stack. |
42 | 42 |
43 static const int kSavedCallerFpSlotFromFp = -1; | 43 static const int kSavedCallerFpSlotFromFp = -1; |
44 static const int kSavedCallerPpSlotFromFp = kSavedCallerFpSlotFromFp; | 44 static const int kSavedCallerPpSlotFromFp = kSavedCallerFpSlotFromFp; |
45 static const int kSavedCallerPcSlotFromFp = -2; | 45 static const int kSavedCallerPcSlotFromFp = -2; |
46 static const int kCallerSpSlotFromFp = -kDartFrameFixedSize-1; | 46 static const int kCallerSpSlotFromFp = -kDartFrameFixedSize - 1; |
47 static const int kPcMarkerSlotFromFp = -3; | 47 static const int kPcMarkerSlotFromFp = -3; |
48 static const int kFunctionSlotFromFp = -4; | 48 static const int kFunctionSlotFromFp = -4; |
49 | 49 |
50 // Note: These constants don't match actual DBC behavior. This is done because | 50 // Note: These constants don't match actual DBC behavior. This is done because |
51 // setting kFirstLocalSlotFromFp to 0 breaks assumptions spread across the code. | 51 // setting kFirstLocalSlotFromFp to 0 breaks assumptions spread across the code. |
52 // Instead for the purposes of local variable allocation we pretend that DBC | 52 // Instead for the purposes of local variable allocation we pretend that DBC |
53 // behaves as other architectures (stack growing downwards) and later fix | 53 // behaves as other architectures (stack growing downwards) and later fix |
54 // these indices during code generation in the backend. | 54 // these indices during code generation in the backend. |
55 static const int kParamEndSlotFromFp = 4; // One slot past last parameter. | 55 static const int kParamEndSlotFromFp = 4; // One slot past last parameter. |
56 static const int kFirstLocalSlotFromFp = -1; | 56 static const int kFirstLocalSlotFromFp = -1; |
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78 static const int kExitLinkSlotFromEntryFp = 0; | 78 static const int kExitLinkSlotFromEntryFp = 0; |
79 | 79 |
80 // Value for stack limit that is used to cause an interrupt. | 80 // Value for stack limit that is used to cause an interrupt. |
81 // Note that on DBC stack is growing upwards so interrupt limit is 0 unlike | 81 // Note that on DBC stack is growing upwards so interrupt limit is 0 unlike |
82 // on all other architectures. | 82 // on all other architectures. |
83 static const uword kInterruptStackLimit = 0; | 83 static const uword kInterruptStackLimit = 0; |
84 | 84 |
85 } // namespace dart | 85 } // namespace dart |
86 | 86 |
87 #endif // RUNTIME_VM_STACK_FRAME_DBC_H_ | 87 #endif // RUNTIME_VM_STACK_FRAME_DBC_H_ |
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