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| 1 // Copyright 2009 the V8 project authors. All rights reserved. | |
| 2 // Redistribution and use in source and binary forms, with or without | |
| 3 // modification, are permitted provided that the following conditions are | |
| 4 // met: | |
| 5 // | |
| 6 // * Redistributions of source code must retain the above copyright | |
| 7 // notice, this list of conditions and the following disclaimer. | |
| 8 // * Redistributions in binary form must reproduce the above | |
| 9 // copyright notice, this list of conditions and the following | |
| 10 // disclaimer in the documentation and/or other materials provided | |
| 11 // with the distribution. | |
| 12 // * Neither the name of Google Inc. nor the names of its | |
| 13 // contributors may be used to endorse or promote products derived | |
| 14 // from this software without specific prior written permission. | |
| 15 // | |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | |
| 28 #ifndef V8_FRAME_ELEMENT_H_ | |
| 29 #define V8_FRAME_ELEMENT_H_ | |
| 30 | |
| 31 #include "register-allocator-inl.h" | |
| 32 | |
| 33 namespace v8 { namespace internal { | |
| 34 | |
| 35 // ------------------------------------------------------------------------- | |
| 36 // Virtual frame elements | |
| 37 // | |
| 38 // The internal elements of the virtual frames. There are several kinds of | |
| 39 // elements: | |
| 40 // * Invalid: elements that are uninitialized or not actually part | |
| 41 // of the virtual frame. They should not be read. | |
| 42 // * Memory: an element that resides in the actual frame. Its address is | |
| 43 // given by its position in the virtual frame. | |
| 44 // * Register: an element that resides in a register. | |
| 45 // * Constant: an element whose value is known at compile time. | |
| 46 | |
| 47 class FrameElement BASE_EMBEDDED { | |
| 48 public: | |
| 49 enum SyncFlag { | |
| 50 NOT_SYNCED, | |
| 51 SYNCED | |
| 52 }; | |
| 53 | |
| 54 // The default constructor creates an invalid frame element. | |
| 55 FrameElement() { | |
| 56 value_ = StaticTypeField::encode(StaticType::UNKNOWN_TYPE) | |
| 57 | TypeField::encode(INVALID) | |
| 58 | CopiedField::encode(false) | |
| 59 | SyncedField::encode(false) | |
| 60 | DataField::encode(0); | |
| 61 } | |
| 62 | |
| 63 // Factory function to construct an invalid frame element. | |
| 64 static FrameElement InvalidElement() { | |
| 65 FrameElement result; | |
| 66 return result; | |
| 67 } | |
| 68 | |
| 69 // Factory function to construct an in-memory frame element. | |
| 70 static FrameElement MemoryElement() { | |
| 71 FrameElement result(MEMORY, no_reg, SYNCED); | |
| 72 return result; | |
| 73 } | |
| 74 | |
| 75 // Factory function to construct an in-register frame element. | |
| 76 static FrameElement RegisterElement(Register reg, | |
| 77 SyncFlag is_synced, | |
| 78 StaticType static_type = StaticType()) { | |
| 79 return FrameElement(REGISTER, reg, is_synced, static_type); | |
| 80 } | |
| 81 | |
| 82 // Factory function to construct a frame element whose value is known at | |
| 83 // compile time. | |
| 84 static FrameElement ConstantElement(Handle<Object> value, | |
| 85 SyncFlag is_synced) { | |
| 86 FrameElement result(value, is_synced); | |
| 87 return result; | |
| 88 } | |
| 89 | |
| 90 // Static indirection table for handles to constants. If a frame | |
| 91 // element represents a constant, the data contains an index into | |
| 92 // this table of handles to the actual constants. | |
| 93 typedef ZoneList<Handle<Object> > ZoneObjectList; | |
| 94 | |
| 95 static ZoneObjectList* ConstantList() { | |
| 96 static ZoneObjectList list(10); | |
| 97 return &list; | |
| 98 } | |
| 99 | |
| 100 // Clear the constants indirection table. | |
| 101 static void ClearConstantList() { | |
| 102 ConstantList()->Clear(); | |
| 103 } | |
| 104 | |
| 105 bool is_synced() const { return SyncedField::decode(value_); } | |
| 106 | |
| 107 void set_sync() { | |
| 108 ASSERT(type() != MEMORY); | |
| 109 value_ = value_ | SyncedField::encode(true); | |
| 110 } | |
| 111 | |
| 112 void clear_sync() { | |
| 113 ASSERT(type() != MEMORY); | |
| 114 value_ = value_ & ~SyncedField::mask(); | |
| 115 } | |
| 116 | |
| 117 bool is_valid() const { return type() != INVALID; } | |
| 118 bool is_memory() const { return type() == MEMORY; } | |
| 119 bool is_register() const { return type() == REGISTER; } | |
| 120 bool is_constant() const { return type() == CONSTANT; } | |
| 121 bool is_copy() const { return type() == COPY; } | |
| 122 | |
| 123 bool is_copied() const { return CopiedField::decode(value_); } | |
| 124 void set_copied() { value_ = value_ | CopiedField::encode(true); } | |
| 125 void clear_copied() { value_ = value_ & ~CopiedField::mask(); } | |
| 126 | |
| 127 Register reg() const { | |
| 128 ASSERT(is_register()); | |
| 129 uint32_t reg = DataField::decode(value_); | |
| 130 Register result; | |
| 131 result.code_ = reg; | |
| 132 return result; | |
| 133 } | |
| 134 | |
| 135 Handle<Object> handle() const { | |
| 136 ASSERT(is_constant()); | |
| 137 return ConstantList()->at(DataField::decode(value_)); | |
| 138 } | |
| 139 | |
| 140 int index() const { | |
| 141 ASSERT(is_copy()); | |
| 142 return DataField::decode(value_); | |
| 143 } | |
| 144 | |
| 145 StaticType static_type() { | |
| 146 return StaticType(StaticTypeField::decode(value_)); | |
| 147 } | |
| 148 | |
| 149 void set_static_type(StaticType static_type) { | |
| 150 value_ = value_ & ~StaticTypeField::mask(); | |
| 151 value_ = value_ | StaticTypeField::encode(static_type.static_type_); | |
| 152 } | |
| 153 | |
| 154 bool Equals(FrameElement other) { | |
| 155 if (value_ == other.value_) return true; | |
| 156 | |
| 157 if (type() != other.type() || | |
| 158 is_copied() != other.is_copied() || | |
| 159 is_synced() != other.is_synced()) return false; | |
| 160 | |
| 161 if (is_register()) { | |
| 162 if (!reg().is(other.reg())) return false; | |
| 163 } else if (is_constant()) { | |
| 164 if (!handle().is_identical_to(other.handle())) return false; | |
| 165 } else if (is_copy()) { | |
| 166 if (index() != other.index()) return false; | |
| 167 } | |
| 168 | |
| 169 return true; | |
| 170 } | |
| 171 | |
| 172 // Given a pair of non-null frame element pointers, return one of them | |
| 173 // as an entry frame candidate or null if they are incompatible. | |
| 174 FrameElement* Combine(FrameElement* other) { | |
| 175 // If either is invalid, the result is. | |
| 176 if (!is_valid()) return this; | |
| 177 if (!other->is_valid()) return other; | |
| 178 | |
| 179 // If they do not have the exact same location we reallocate. | |
| 180 bool not_same_location = | |
| 181 (type() != other->type()) || | |
| 182 (is_register() && !reg().is(other->reg())) || | |
| 183 (is_constant() && !handle().is_identical_to(other->handle())) || | |
| 184 (is_copy() && index() != other->index()); | |
| 185 if (not_same_location) return NULL; | |
| 186 | |
| 187 // If either is unsynced, the result is. The result static type is | |
| 188 // the merge of the static types. It's safe to set it on one of the | |
| 189 // frame elements, and harmless too (because we are only going to | |
| 190 // merge the reaching frames and will ensure that the types are | |
| 191 // coherent, and changing the static type does not emit code). | |
| 192 FrameElement* result = is_synced() ? other : this; | |
| 193 result->set_static_type(static_type().merge(other->static_type())); | |
| 194 return result; | |
| 195 } | |
| 196 | |
| 197 private: | |
| 198 enum Type { | |
| 199 INVALID, | |
| 200 MEMORY, | |
| 201 REGISTER, | |
| 202 CONSTANT, | |
| 203 COPY | |
| 204 }; | |
| 205 | |
| 206 // Used to construct memory and register elements. | |
| 207 FrameElement(Type type, Register reg, SyncFlag is_synced) { | |
| 208 value_ = StaticTypeField::encode(StaticType::UNKNOWN_TYPE) | |
| 209 | TypeField::encode(type) | |
| 210 | CopiedField::encode(false) | |
| 211 | SyncedField::encode(is_synced != NOT_SYNCED) | |
| 212 | DataField::encode(reg.code_ > 0 ? reg.code_ : 0); | |
| 213 } | |
| 214 | |
| 215 FrameElement(Type type, Register reg, SyncFlag is_synced, StaticType stype) { | |
| 216 value_ = StaticTypeField::encode(stype.static_type_) | |
| 217 | TypeField::encode(type) | |
| 218 | CopiedField::encode(false) | |
| 219 | SyncedField::encode(is_synced != NOT_SYNCED) | |
| 220 | DataField::encode(reg.code_ > 0 ? reg.code_ : 0); | |
| 221 } | |
| 222 | |
| 223 // Used to construct constant elements. | |
| 224 FrameElement(Handle<Object> value, SyncFlag is_synced) { | |
| 225 value_ = StaticTypeField::encode(StaticType::TypeOf(*value).static_type_) | |
| 226 | TypeField::encode(CONSTANT) | |
| 227 | CopiedField::encode(false) | |
| 228 | SyncedField::encode(is_synced != NOT_SYNCED) | |
| 229 | DataField::encode(ConstantList()->length()); | |
| 230 ConstantList()->Add(value); | |
| 231 } | |
| 232 | |
| 233 Type type() const { return TypeField::decode(value_); } | |
| 234 void set_type(Type type) { | |
| 235 value_ = value_ & ~TypeField::mask(); | |
| 236 value_ = value_ | TypeField::encode(type); | |
| 237 } | |
| 238 | |
| 239 void set_index(int new_index) { | |
| 240 ASSERT(is_copy()); | |
| 241 value_ = value_ & ~DataField::mask(); | |
| 242 value_ = value_ | DataField::encode(new_index); | |
| 243 } | |
| 244 | |
| 245 void set_reg(Register new_reg) { | |
| 246 ASSERT(is_register()); | |
| 247 value_ = value_ & ~DataField::mask(); | |
| 248 value_ = value_ | DataField::encode(new_reg.code_); | |
| 249 } | |
| 250 | |
| 251 // Encode static type, type, copied, synced and data in one 32 bit integer. | |
| 252 uint32_t value_; | |
| 253 | |
| 254 class StaticTypeField: public BitField<StaticType::StaticTypeEnum, 0, 3> {}; | |
| 255 class TypeField: public BitField<Type, 3, 3> {}; | |
| 256 class CopiedField: public BitField<uint32_t, 6, 1> {}; | |
| 257 class SyncedField: public BitField<uint32_t, 7, 1> {}; | |
| 258 class DataField: public BitField<uint32_t, 8, 32 - 9> {}; | |
| 259 | |
| 260 friend class VirtualFrame; | |
| 261 }; | |
| 262 | |
| 263 } } // namespace v8::internal | |
| 264 | |
| 265 #endif // V8_FRAME_ELEMENT_H_ | |
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Chromium Code Reviews
Issue 115350:
Revert revision 1949. (Closed)
Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/