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