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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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28 #include "v8.h" | 28 #include "v8.h" |
29 | 29 |
30 #include "ast.h" | 30 #include "ast.h" |
31 #include "scopes.h" | 31 #include "scopes.h" |
32 #include "variables.h" | 32 #include "variables.h" |
33 | 33 |
34 namespace v8 { | 34 namespace v8 { |
35 namespace internal { | 35 namespace internal { |
36 | 36 |
37 // ---------------------------------------------------------------------------- | 37 // ---------------------------------------------------------------------------- |
38 // Implementation UseCount. | |
39 | |
40 UseCount::UseCount() | |
41 : nreads_(0), | |
42 nwrites_(0) { | |
43 } | |
44 | |
45 | |
46 void UseCount::RecordRead(int weight) { | |
47 ASSERT(weight > 0); | |
48 nreads_ += weight; | |
49 // We must have a positive nreads_ here. Handle | |
50 // any kind of overflow by setting nreads_ to | |
51 // some large-ish value. | |
52 if (nreads_ <= 0) nreads_ = 1000000; | |
53 ASSERT(is_read() & is_used()); | |
54 } | |
55 | |
56 | |
57 void UseCount::RecordWrite(int weight) { | |
58 ASSERT(weight > 0); | |
59 nwrites_ += weight; | |
60 // We must have a positive nwrites_ here. Handle | |
61 // any kind of overflow by setting nwrites_ to | |
62 // some large-ish value. | |
63 if (nwrites_ <= 0) nwrites_ = 1000000; | |
64 ASSERT(is_written() && is_used()); | |
65 } | |
66 | |
67 | |
68 void UseCount::RecordAccess(int weight) { | |
69 RecordRead(weight); | |
70 RecordWrite(weight); | |
71 } | |
72 | |
73 | |
74 void UseCount::RecordUses(UseCount* uses) { | |
75 if (uses->nreads() > 0) RecordRead(uses->nreads()); | |
76 if (uses->nwrites() > 0) RecordWrite(uses->nwrites()); | |
77 } | |
78 | |
79 | |
80 #ifdef DEBUG | |
81 void UseCount::Print() { | |
82 // PrintF("r = %d, w = %d", nreads_, nwrites_); | |
83 PrintF("%du = %dr + %dw", nuses(), nreads(), nwrites()); | |
84 } | |
85 #endif | |
86 | |
87 | |
88 // ---------------------------------------------------------------------------- | |
89 // Implementation StaticType. | 38 // Implementation StaticType. |
90 | 39 |
91 | 40 |
92 const char* StaticType::Type2String(StaticType* type) { | 41 const char* StaticType::Type2String(StaticType* type) { |
93 switch (type->kind_) { | 42 switch (type->kind_) { |
94 case UNKNOWN: | 43 case UNKNOWN: |
95 return "UNKNOWN"; | 44 return "UNKNOWN"; |
96 case LIKELY_SMI: | 45 case LIKELY_SMI: |
97 return "LIKELY_SMI"; | 46 return "LIKELY_SMI"; |
98 default: | 47 default: |
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141 Mode mode, | 90 Mode mode, |
142 bool is_valid_LHS, | 91 bool is_valid_LHS, |
143 Kind kind) | 92 Kind kind) |
144 : scope_(scope), | 93 : scope_(scope), |
145 name_(name), | 94 name_(name), |
146 mode_(mode), | 95 mode_(mode), |
147 is_valid_LHS_(is_valid_LHS), | 96 is_valid_LHS_(is_valid_LHS), |
148 kind_(kind), | 97 kind_(kind), |
149 local_if_not_shadowed_(NULL), | 98 local_if_not_shadowed_(NULL), |
150 is_accessed_from_inner_scope_(false), | 99 is_accessed_from_inner_scope_(false), |
| 100 is_used_(false), |
151 rewrite_(NULL) { | 101 rewrite_(NULL) { |
152 // names must be canonicalized for fast equality checks | 102 // names must be canonicalized for fast equality checks |
153 ASSERT(name->IsSymbol()); | 103 ASSERT(name->IsSymbol()); |
154 } | 104 } |
155 | 105 |
156 | 106 |
157 bool Variable::is_global() const { | 107 bool Variable::is_global() const { |
158 // Temporaries are never global, they must always be allocated in the | 108 // Temporaries are never global, they must always be allocated in the |
159 // activation frame. | 109 // activation frame. |
160 return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope(); | 110 return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope(); |
161 } | 111 } |
162 | 112 |
163 } } // namespace v8::internal | 113 } } // namespace v8::internal |
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