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 34namespace v8 { 35namespace internal { 36 37// ---------------------------------------------------------------------------- 38// Implementation Variable. 39 40const 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 57Variable::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 84bool 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 91int 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