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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. | 1 // Copyright (c) 1994-2006 Sun Microsystems Inc. |
2 // All Rights Reserved. | 2 // All Rights Reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // - Redistributions of source code must retain the above copyright notice, | 8 // - Redistributions of source code must retain the above copyright notice, |
9 // this list of conditions and the following disclaimer. | 9 // this list of conditions and the following disclaimer. |
10 // | 10 // |
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43 | 43 |
44 | 44 |
45 // ----------------------------------------------------------------------------- | 45 // ----------------------------------------------------------------------------- |
46 // Labels represent pc locations; they are typically jump or call targets. | 46 // Labels represent pc locations; they are typically jump or call targets. |
47 // After declaration, a label can be freely used to denote known or (yet) | 47 // After declaration, a label can be freely used to denote known or (yet) |
48 // unknown pc location. Assembler::bind() is used to bind a label to the | 48 // unknown pc location. Assembler::bind() is used to bind a label to the |
49 // current pc. A label can be bound only once. | 49 // current pc. A label can be bound only once. |
50 | 50 |
51 class Label : public ZoneObject { // LabelShadows are dynamically allocated. | 51 class Label : public ZoneObject { // LabelShadows are dynamically allocated. |
52 public: | 52 public: |
53 INLINE(Label()) { Unuse(); } | 53 INLINE(Label()) |
54 { Unuse(); } | |
Mads Ager (chromium)
2008/11/25 21:09:41
This looks like an accidental edit?
Erik Corry
2008/11/26 12:18:36
Indeed it does. Fixed.
| |
54 INLINE(~Label()) { ASSERT(!is_linked()); } | 55 INLINE(~Label()) { ASSERT(!is_linked()); } |
55 | 56 |
56 INLINE(void Unuse()) { pos_ = 0; } | 57 INLINE(void Unuse()) { pos_ = 0; } |
57 | 58 |
58 INLINE(bool is_bound() const) { return pos_ < 0; } | 59 INLINE(bool is_bound() const) { return pos_ < 0; } |
59 INLINE(bool is_unused() const) { return pos_ == 0; } | 60 INLINE(bool is_unused() const) { return pos_ == 0; } |
60 INLINE(bool is_linked() const) { return pos_ > 0; } | 61 INLINE(bool is_linked() const) { return pos_ > 0; } |
61 | 62 |
62 // Returns the position of bound or linked labels. Cannot be used | 63 // Returns the position of bound or linked labels. Cannot be used |
63 // for unused labels. | 64 // for unused labels. |
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75 void bind_to(int pos) { | 76 void bind_to(int pos) { |
76 pos_ = -pos - 1; | 77 pos_ = -pos - 1; |
77 ASSERT(is_bound()); | 78 ASSERT(is_bound()); |
78 } | 79 } |
79 void link_to(int pos) { | 80 void link_to(int pos) { |
80 pos_ = pos + 1; | 81 pos_ = pos + 1; |
81 ASSERT(is_linked()); | 82 ASSERT(is_linked()); |
82 } | 83 } |
83 | 84 |
84 friend class Assembler; | 85 friend class Assembler; |
86 friend class RegexpAssembler; | |
85 friend class Displacement; | 87 friend class Displacement; |
86 friend class LabelShadow; | 88 friend class LabelShadow; |
89 friend class IrregexpAssembler; | |
87 }; | 90 }; |
88 | 91 |
89 | 92 |
90 // A LabelShadow represents a label that is temporarily shadowed by another | 93 // A LabelShadow represents a label that is temporarily shadowed by another |
91 // label (represented by the original label during shadowing). They are used | 94 // label (represented by the original label during shadowing). They are used |
92 // to catch jumps to labels in certain contexts, e.g. try blocks. After | 95 // to catch jumps to labels in certain contexts, e.g. try blocks. After |
93 // shadowing ends, the formerly shadowed label is again represented by the | 96 // shadowing ends, the formerly shadowed label is again represented by the |
94 // original label and the LabelShadow can be used as a label in its own | 97 // original label and the LabelShadow can be used as a label in its own |
95 // right, representing the formerly shadowing label. | 98 // right, representing the formerly shadowing label. |
96 class LabelShadow : public Label { | 99 class LabelShadow : public Label { |
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468 static inline bool is_uint4(int x) { return is_uintn(x, 4); } | 471 static inline bool is_uint4(int x) { return is_uintn(x, 4); } |
469 static inline bool is_uint5(int x) { return is_uintn(x, 5); } | 472 static inline bool is_uint5(int x) { return is_uintn(x, 5); } |
470 static inline bool is_uint8(int x) { return is_uintn(x, 8); } | 473 static inline bool is_uint8(int x) { return is_uintn(x, 8); } |
471 static inline bool is_uint12(int x) { return is_uintn(x, 12); } | 474 static inline bool is_uint12(int x) { return is_uintn(x, 12); } |
472 static inline bool is_uint16(int x) { return is_uintn(x, 16); } | 475 static inline bool is_uint16(int x) { return is_uintn(x, 16); } |
473 static inline bool is_uint24(int x) { return is_uintn(x, 24); } | 476 static inline bool is_uint24(int x) { return is_uintn(x, 24); } |
474 | 477 |
475 } } // namespace v8::internal | 478 } } // namespace v8::internal |
476 | 479 |
477 #endif // V8_ASSEMBLER_H_ | 480 #endif // V8_ASSEMBLER_H_ |
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