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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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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; |
57 | 57 |
58 | |
59 DART_FORCE_INLINE static intptr_t LocalVarIndex(intptr_t fp_offset, | 58 DART_FORCE_INLINE static intptr_t LocalVarIndex(intptr_t fp_offset, |
60 intptr_t var_index) { | 59 intptr_t var_index) { |
61 ASSERT(var_index != 0); | 60 ASSERT(var_index != 0); |
62 if (var_index > 0) { | 61 if (var_index > 0) { |
63 return fp_offset - var_index; | 62 return fp_offset - var_index; |
64 } else { | 63 } else { |
65 return fp_offset - (var_index + 1); | 64 return fp_offset - (var_index + 1); |
66 } | 65 } |
67 } | 66 } |
68 | 67 |
69 | |
70 DART_FORCE_INLINE static uword ParamAddress(uword fp, intptr_t reverse_index) { | 68 DART_FORCE_INLINE static uword ParamAddress(uword fp, intptr_t reverse_index) { |
71 return fp - (kDartFrameFixedSize + reverse_index) * kWordSize; | 69 return fp - (kDartFrameFixedSize + reverse_index) * kWordSize; |
72 } | 70 } |
73 | 71 |
74 DART_FORCE_INLINE static bool IsCalleeFrameOf(uword fp, uword other_fp) { | 72 DART_FORCE_INLINE static bool IsCalleeFrameOf(uword fp, uword other_fp) { |
75 return other_fp > fp; | 73 return other_fp > fp; |
76 } | 74 } |
77 | 75 |
78 static const int kExitLinkSlotFromEntryFp = 0; | 76 static const int kExitLinkSlotFromEntryFp = 0; |
79 | 77 |
80 // Value for stack limit that is used to cause an interrupt. | 78 // 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 | 79 // Note that on DBC stack is growing upwards so interrupt limit is 0 unlike |
82 // on all other architectures. | 80 // on all other architectures. |
83 static const uword kInterruptStackLimit = 0; | 81 static const uword kInterruptStackLimit = 0; |
84 | 82 |
85 } // namespace dart | 83 } // namespace dart |
86 | 84 |
87 #endif // RUNTIME_VM_STACK_FRAME_DBC_H_ | 85 #endif // RUNTIME_VM_STACK_FRAME_DBC_H_ |
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