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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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| 43 VariableMap(); | 43 VariableMap(); |
| 44 | 44 |
| 45 // Dummy constructor. This constructor doesn't set up the map | 45 // Dummy constructor. This constructor doesn't set up the map |
| 46 // properly so don't use it unless you have a good reason. | 46 // properly so don't use it unless you have a good reason. |
| 47 explicit VariableMap(bool gotta_love_static_overloading); | 47 explicit VariableMap(bool gotta_love_static_overloading); |
| 48 | 48 |
| 49 virtual ~VariableMap(); | 49 virtual ~VariableMap(); |
| 50 | 50 |
| 51 Variable* Declare(Scope* scope, | 51 Variable* Declare(Scope* scope, |
| 52 Handle<String> name, | 52 Handle<String> name, |
| 53 Variable::Mode mode, | 53 VariableMode mode, |
| 54 bool is_valid_lhs, | 54 bool is_valid_lhs, |
| 55 Variable::Kind kind); | 55 Variable::Kind kind); |
| 56 | 56 |
| 57 Variable* Lookup(Handle<String> name); | 57 Variable* Lookup(Handle<String> name); |
| 58 }; | 58 }; |
| 59 | 59 |
| 60 | 60 |
| 61 // The dynamic scope part holds hash maps for the variables that will | 61 // The dynamic scope part holds hash maps for the variables that will |
| 62 // be looked up dynamically from within eval and with scopes. The objects | 62 // be looked up dynamically from within eval and with scopes. The objects |
| 63 // are allocated on-demand from Scope::NonLocal to avoid wasting memory | 63 // are allocated on-demand from Scope::NonLocal to avoid wasting memory |
| 64 // and setup time for scopes that don't need them. | 64 // and setup time for scopes that don't need them. |
| 65 class DynamicScopePart : public ZoneObject { | 65 class DynamicScopePart : public ZoneObject { |
| 66 public: | 66 public: |
| 67 VariableMap* GetMap(Variable::Mode mode) { | 67 VariableMap* GetMap(VariableMode mode) { |
| 68 int index = mode - Variable::DYNAMIC; | 68 int index = mode - DYNAMIC; |
| 69 ASSERT(index >= 0 && index < 3); | 69 ASSERT(index >= 0 && index < 3); |
| 70 return &maps_[index]; | 70 return &maps_[index]; |
| 71 } | 71 } |
| 72 | 72 |
| 73 private: | 73 private: |
| 74 VariableMap maps_[3]; | 74 VariableMap maps_[3]; |
| 75 }; | 75 }; |
| 76 | 76 |
| 77 | 77 |
| 78 // Global invariants after AST construction: Each reference (i.e. identifier) | 78 // Global invariants after AST construction: Each reference (i.e. identifier) |
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| 128 Variable* Lookup(Handle<String> name); | 128 Variable* Lookup(Handle<String> name); |
| 129 | 129 |
| 130 // Declare the function variable for a function literal. This variable | 130 // Declare the function variable for a function literal. This variable |
| 131 // is in an intermediate scope between this function scope and the the | 131 // is in an intermediate scope between this function scope and the the |
| 132 // outer scope. Only possible for function scopes; at most one variable. | 132 // outer scope. Only possible for function scopes; at most one variable. |
| 133 Variable* DeclareFunctionVar(Handle<String> name); | 133 Variable* DeclareFunctionVar(Handle<String> name); |
| 134 | 134 |
| 135 // Declare a parameter in this scope. When there are duplicated | 135 // Declare a parameter in this scope. When there are duplicated |
| 136 // parameters the rightmost one 'wins'. However, the implementation | 136 // parameters the rightmost one 'wins'. However, the implementation |
| 137 // expects all parameters to be declared and from left to right. | 137 // expects all parameters to be declared and from left to right. |
| 138 void DeclareParameter(Handle<String> name, Variable::Mode mode); | 138 void DeclareParameter(Handle<String> name, VariableMode mode); |
| 139 | 139 |
| 140 // Declare a local variable in this scope. If the variable has been | 140 // Declare a local variable in this scope. If the variable has been |
| 141 // declared before, the previously declared variable is returned. | 141 // declared before, the previously declared variable is returned. |
| 142 Variable* DeclareLocal(Handle<String> name, Variable::Mode mode); | 142 Variable* DeclareLocal(Handle<String> name, VariableMode mode); |
| 143 | 143 |
| 144 // Declare an implicit global variable in this scope which must be a | 144 // Declare an implicit global variable in this scope which must be a |
| 145 // global scope. The variable was introduced (possibly from an inner | 145 // global scope. The variable was introduced (possibly from an inner |
| 146 // scope) by a reference to an unresolved variable with no intervening | 146 // scope) by a reference to an unresolved variable with no intervening |
| 147 // with statements or eval calls. | 147 // with statements or eval calls. |
| 148 Variable* DeclareGlobal(Handle<String> name); | 148 Variable* DeclareGlobal(Handle<String> name); |
| 149 | 149 |
| 150 // Create a new unresolved variable. | 150 // Create a new unresolved variable. |
| 151 VariableProxy* NewUnresolved(Handle<String> name, | 151 VariableProxy* NewUnresolved(Handle<String> name, |
| 152 bool inside_with, | 152 bool inside_with, |
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| 399 // Computed via AllocateVariables; function scopes only. | 399 // Computed via AllocateVariables; function scopes only. |
| 400 int num_stack_slots_; | 400 int num_stack_slots_; |
| 401 int num_heap_slots_; | 401 int num_heap_slots_; |
| 402 | 402 |
| 403 // Serialized scopes support. | 403 // Serialized scopes support. |
| 404 Handle<SerializedScopeInfo> scope_info_; | 404 Handle<SerializedScopeInfo> scope_info_; |
| 405 bool already_resolved() { return already_resolved_; } | 405 bool already_resolved() { return already_resolved_; } |
| 406 | 406 |
| 407 // Create a non-local variable with a given name. | 407 // Create a non-local variable with a given name. |
| 408 // These variables are looked up dynamically at runtime. | 408 // These variables are looked up dynamically at runtime. |
| 409 Variable* NonLocal(Handle<String> name, Variable::Mode mode); | 409 Variable* NonLocal(Handle<String> name, VariableMode mode); |
| 410 | 410 |
| 411 // Variable resolution. | 411 // Variable resolution. |
| 412 Variable* LookupRecursive(Handle<String> name, | 412 Variable* LookupRecursive(Handle<String> name, |
| 413 bool from_inner_function, | 413 bool from_inner_function, |
| 414 Variable** invalidated_local); | 414 Variable** invalidated_local); |
| 415 void ResolveVariable(Scope* global_scope, | 415 void ResolveVariable(Scope* global_scope, |
| 416 Handle<Context> context, | 416 Handle<Context> context, |
| 417 VariableProxy* proxy); | 417 VariableProxy* proxy); |
| 418 void ResolveVariablesRecursively(Scope* global_scope, | 418 void ResolveVariablesRecursively(Scope* global_scope, |
| 419 Handle<Context> context); | 419 Handle<Context> context); |
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| 452 } | 452 } |
| 453 | 453 |
| 454 void SetDefaults(Type type, | 454 void SetDefaults(Type type, |
| 455 Scope* outer_scope, | 455 Scope* outer_scope, |
| 456 Handle<SerializedScopeInfo> scope_info); | 456 Handle<SerializedScopeInfo> scope_info); |
| 457 }; | 457 }; |
| 458 | 458 |
| 459 } } // namespace v8::internal | 459 } } // namespace v8::internal |
| 460 | 460 |
| 461 #endif // V8_SCOPES_H_ | 461 #endif // V8_SCOPES_H_ |
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