1 // Copyright 2011 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 #include "v8.h" 29 30 #include "ast.h" 31 #include "scopes.h" 32 #include "variables.h" 33 34 namespace v8 { 35 namespace internal { 36 37 // ---------------------------------------------------------------------------- 38 // Implementation Variable. 39 40 const char* Variable::Mode2String(VariableMode mode) { 41 switch (mode) { 42 case VAR: return "VAR"; 43 case CONST: return "CONST"; 44 case LET: return "LET"; 45 case CONST_HARMONY: return "CONST_HARMONY"; 46 case MODULE: return "MODULE"; 47 case DYNAMIC: return "DYNAMIC"; 48 case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL"; 49 case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL"; 50 case INTERNAL: return "INTERNAL"; 51 case TEMPORARY: return "TEMPORARY"; 52 } 53 UNREACHABLE(); 54 return NULL; 55 } 56 57 58 Variable::Variable(Scope* scope, 59 Handle<String> name, 60 VariableMode mode, 61 bool is_valid_LHS, 62 Kind kind, 63 InitializationFlag initialization_flag, 64 Interface* interface) 65 : scope_(scope), 66 name_(name), 67 mode_(mode), 68 kind_(kind), 69 location_(UNALLOCATED), 70 index_(-1), 71 initializer_position_(RelocInfo::kNoPosition), 72 local_if_not_shadowed_(NULL), 73 is_valid_LHS_(is_valid_LHS), 74 force_context_allocation_(false), 75 is_used_(false), 76 initialization_flag_(initialization_flag), 77 interface_(interface) { 78 // Names must be canonicalized for fast equality checks. 79 ASSERT(name->IsInternalizedString()); 80 // Var declared variables never need initialization. 81 ASSERT(!(mode == VAR && initialization_flag == kNeedsInitialization)); 82 } 83 84 85 bool Variable::IsGlobalObjectProperty() const { 86 // Temporaries are never global, they must always be allocated in the 87 // activation frame. 88 return (IsDynamicVariableMode(mode_) || 89 (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_))) 90 && scope_ != NULL && scope_->is_global_scope(); 91 } 92 93 94 int Variable::CompareIndex(Variable* const* v, Variable* const* w) { 95 int x = (*v)->index(); 96 int y = (*w)->index(); 97 // Consider sorting them according to type as well? 98 return x - y; 99 } 100 101 } } // namespace v8::internal 102
