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Diffstat (limited to 'V8Binding/v8/src/contexts.h')
| -rw-r--r-- | V8Binding/v8/src/contexts.h | 343 |
1 files changed, 0 insertions, 343 deletions
diff --git a/V8Binding/v8/src/contexts.h b/V8Binding/v8/src/contexts.h deleted file mode 100644 index bdfc40b..0000000 --- a/V8Binding/v8/src/contexts.h +++ /dev/null @@ -1,343 +0,0 @@ -// Copyright 2006-2008 the V8 project authors. All rights reserved. -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following -// disclaimer in the documentation and/or other materials provided -// with the distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived -// from this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -#ifndef V8_CONTEXTS_H_ -#define V8_CONTEXTS_H_ - -namespace v8 { -namespace internal { - - -enum ContextLookupFlags { - FOLLOW_CONTEXT_CHAIN = 1, - FOLLOW_PROTOTYPE_CHAIN = 2, - - DONT_FOLLOW_CHAINS = 0, - FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN -}; - - -// Heap-allocated activation contexts. -// -// Contexts are implemented as FixedArray objects; the Context -// class is a convenience interface casted on a FixedArray object. -// -// Note: Context must have no virtual functions and Context objects -// must always be allocated via Heap::AllocateContext() or -// Factory::NewContext. - -// Comment for special_function_table: -// Table for providing optimized/specialized functions. -// The array contains triplets [object, general_function, optimized_function]. -// Primarily added to support built-in optimized variants of -// Array.prototype.{push,pop}. - -#define GLOBAL_CONTEXT_FIELDS(V) \ - V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ - V(SECURITY_TOKEN_INDEX, Object, security_token) \ - V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ - V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ - V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ - V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ - V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ - V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ - V(JSON_OBJECT_INDEX, JSObject, json_object) \ - V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ - V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ - V(CREATE_DATE_FUN_INDEX, JSFunction, create_date_fun) \ - V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun) \ - V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun) \ - V(TO_DETAIL_STRING_FUN_INDEX, JSFunction, to_detail_string_fun) \ - V(TO_OBJECT_FUN_INDEX, JSFunction, to_object_fun) \ - V(TO_INTEGER_FUN_INDEX, JSFunction, to_integer_fun) \ - V(TO_UINT32_FUN_INDEX, JSFunction, to_uint32_fun) \ - V(TO_INT32_FUN_INDEX, JSFunction, to_int32_fun) \ - V(TO_BOOLEAN_FUN_INDEX, JSFunction, to_boolean_fun) \ - V(INSTANTIATE_FUN_INDEX, JSFunction, instantiate_fun) \ - V(CONFIGURE_INSTANCE_FUN_INDEX, JSFunction, configure_instance_fun) \ - V(FUNCTION_MAP_INDEX, Map, function_map) \ - V(FUNCTION_INSTANCE_MAP_INDEX, Map, function_instance_map) \ - V(JS_ARRAY_MAP_INDEX, Map, js_array_map)\ - V(SPECIAL_FUNCTION_TABLE_INDEX, FixedArray, special_function_table) \ - V(ARGUMENTS_BOILERPLATE_INDEX, JSObject, arguments_boilerplate) \ - V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \ - V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \ - V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \ - V(CONFIGURE_GLOBAL_INDEX, JSFunction, configure_global_fun) \ - V(FUNCTION_CACHE_INDEX, JSObject, function_cache) \ - V(RUNTIME_CONTEXT_INDEX, Context, runtime_context) \ - V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ - V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ - call_as_constructor_delegate) \ - V(EMPTY_SCRIPT_INDEX, Script, empty_script) \ - V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ - V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ - V(OUT_OF_MEMORY_INDEX, Object, out_of_memory) \ - V(MAP_CACHE_INDEX, Object, map_cache) \ - V(CONTEXT_DATA_INDEX, Object, data) - -// JSFunctions are pairs (context, function code), sometimes also called -// closures. A Context object is used to represent function contexts and -// dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). -// -// At runtime, the contexts build a stack in parallel to the execution -// stack, with the top-most context being the current context. All contexts -// have the following slots: -// -// [ closure ] This is the current function. It is the same for all -// contexts inside a function. It provides access to the -// incoming context (i.e., the outer context, which may -// or may not become the current function's context), and -// it provides access to the functions code and thus it's -// scope information, which in turn contains the names of -// statically allocated context slots. The names are needed -// for dynamic lookups in the presence of 'with' or 'eval'. -// -// [ fcontext ] A pointer to the innermost enclosing function context. -// It is the same for all contexts *allocated* inside a -// function, and the function context's fcontext points -// to itself. It is only needed for fast access of the -// function context (used for declarations, and static -// context slot access). -// -// [ previous ] A pointer to the previous context. It is NULL for -// function contexts, and non-NULL for 'with' contexts. -// Used to implement the 'with' statement. -// -// [ extension ] A pointer to an extension JSObject, or NULL. Used to -// implement 'with' statements and dynamic declarations -// (through 'eval'). The object in a 'with' statement is -// stored in the extension slot of a 'with' context. -// Dynamically declared variables/functions are also added -// to lazily allocated extension object. Context::Lookup -// searches the extension object for properties. -// -// [ global ] A pointer to the global object. Provided for quick -// access to the global object from inside the code (since -// we always have a context pointer). -// -// In addition, function contexts may have statically allocated context slots -// to store local variables/functions that are accessed from inner functions -// (via static context addresses) or through 'eval' (dynamic context lookups). -// Finally, the global context contains additional slots for fast access to -// global properties. -// -// We may be able to simplify the implementation: -// -// - We may be able to get rid of 'fcontext': We can always use the fact that -// previous == NULL for function contexts and so we can search for them. They -// are only needed when doing dynamic declarations, and the context chains -// tend to be very very short (depth of nesting of 'with' statements). At -// the moment we also use it in generated code for context slot accesses - -// and there we don't want a loop because of code bloat - but we may not -// need it there after all (see comment in codegen_*.cc). -// -// - If we cannot get rid of fcontext, consider making 'previous' never NULL -// except for the global context. This could simplify Context::Lookup. - -class Context: public FixedArray { - public: - // Conversions. - static Context* cast(Object* context) { - ASSERT(context->IsContext()); - return reinterpret_cast<Context*>(context); - } - - // The default context slot layout; indices are FixedArray slot indices. - enum { - // These slots are in all contexts. - CLOSURE_INDEX, - FCONTEXT_INDEX, - PREVIOUS_INDEX, - EXTENSION_INDEX, - GLOBAL_INDEX, - MIN_CONTEXT_SLOTS, - - // These slots are only in global contexts. - GLOBAL_PROXY_INDEX = MIN_CONTEXT_SLOTS, - SECURITY_TOKEN_INDEX, - ARGUMENTS_BOILERPLATE_INDEX, - JS_ARRAY_MAP_INDEX, - FUNCTION_MAP_INDEX, - FUNCTION_INSTANCE_MAP_INDEX, - INITIAL_OBJECT_PROTOTYPE_INDEX, - BOOLEAN_FUNCTION_INDEX, - NUMBER_FUNCTION_INDEX, - STRING_FUNCTION_INDEX, - OBJECT_FUNCTION_INDEX, - ARRAY_FUNCTION_INDEX, - DATE_FUNCTION_INDEX, - JSON_OBJECT_INDEX, - REGEXP_FUNCTION_INDEX, - CREATE_DATE_FUN_INDEX, - TO_NUMBER_FUN_INDEX, - TO_STRING_FUN_INDEX, - TO_DETAIL_STRING_FUN_INDEX, - TO_OBJECT_FUN_INDEX, - TO_INTEGER_FUN_INDEX, - TO_UINT32_FUN_INDEX, - TO_INT32_FUN_INDEX, - TO_BOOLEAN_FUN_INDEX, - INSTANTIATE_FUN_INDEX, - CONFIGURE_INSTANCE_FUN_INDEX, - SPECIAL_FUNCTION_TABLE_INDEX, - MESSAGE_LISTENERS_INDEX, - MAKE_MESSAGE_FUN_INDEX, - GET_STACK_TRACE_LINE_INDEX, - CONFIGURE_GLOBAL_INDEX, - FUNCTION_CACHE_INDEX, - RUNTIME_CONTEXT_INDEX, - CALL_AS_FUNCTION_DELEGATE_INDEX, - CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, - EMPTY_SCRIPT_INDEX, - SCRIPT_FUNCTION_INDEX, - CONTEXT_EXTENSION_FUNCTION_INDEX, - OUT_OF_MEMORY_INDEX, - MAP_CACHE_INDEX, - CONTEXT_DATA_INDEX, - GLOBAL_CONTEXT_SLOTS - }; - - // Direct slot access. - JSFunction* closure() { return JSFunction::cast(get(CLOSURE_INDEX)); } - void set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); } - - Context* fcontext() { return Context::cast(get(FCONTEXT_INDEX)); } - void set_fcontext(Context* context) { set(FCONTEXT_INDEX, context); } - - Context* previous() { - Object* result = unchecked_previous(); - ASSERT(IsBootstrappingOrContext(result)); - return reinterpret_cast<Context*>(result); - } - void set_previous(Context* context) { set(PREVIOUS_INDEX, context); } - - bool has_extension() { return unchecked_extension() != NULL; } - JSObject* extension() { return JSObject::cast(unchecked_extension()); } - void set_extension(JSObject* object) { set(EXTENSION_INDEX, object); } - - GlobalObject* global() { - Object* result = get(GLOBAL_INDEX); - ASSERT(IsBootstrappingOrGlobalObject(result)); - return reinterpret_cast<GlobalObject*>(result); - } - void set_global(GlobalObject* global) { set(GLOBAL_INDEX, global); } - - // Returns a JSGlobalProxy object or null. - JSObject* global_proxy(); - void set_global_proxy(JSObject* global); - - // The builtins object. - JSBuiltinsObject* builtins(); - - // Compute the global context by traversing the context chain. - Context* global_context(); - - // Tells if this is a function context (as opposed to a 'with' context). - bool is_function_context() { return unchecked_previous() == NULL; } - - // Tells whether the global context is marked with out of memory. - bool has_out_of_memory() { - return global_context()->out_of_memory() == Heap::true_value(); - } - - // Mark the global context with out of memory. - void mark_out_of_memory() { - global_context()->set_out_of_memory(Heap::true_value()); - } - - // The exception holder is the object used as a with object in - // the implementation of a catch block. - bool is_exception_holder(Object* object) { - return IsCatchContext() && extension() == object; - } - -#define GLOBAL_CONTEXT_FIELD_ACCESSORS(index, type, name) \ - void set_##name(type* value) { \ - ASSERT(IsGlobalContext()); \ - set(index, value); \ - } \ - type* name() { \ - ASSERT(IsGlobalContext()); \ - return type::cast(get(index)); \ - } - GLOBAL_CONTEXT_FIELDS(GLOBAL_CONTEXT_FIELD_ACCESSORS) -#undef GLOBAL_CONTEXT_FIELD_ACCESSORS - - // Lookup the the slot called name, starting with the current context. - // There are 4 possible outcomes: - // - // 1) index_ >= 0 && result->IsContext(): - // most common case, the result is a Context, and index is the - // context slot index, and the slot exists. - // attributes == READ_ONLY for the function name variable, NONE otherwise. - // - // 2) index_ >= 0 && result->IsJSObject(): - // the result is the JSObject arguments object, the index is the parameter - // index, i.e., key into the arguments object, and the property exists. - // attributes != ABSENT. - // - // 3) index_ < 0 && result->IsJSObject(): - // the result is the JSObject extension context or the global object, - // and the name is the property name, and the property exists. - // attributes != ABSENT. - // - // 4) index_ < 0 && result.is_null(): - // there was no context found with the corresponding property. - // attributes == ABSENT. - Handle<Object> Lookup(Handle<String> name, ContextLookupFlags flags, - int* index_, PropertyAttributes* attributes); - - // Determine if a local variable with the given name exists in a - // context. Do not consider context extension objects. This is - // used for compiling code using eval. If the context surrounding - // the eval call does not have a local variable with this name and - // does not contain a with statement the property is global unless - // it is shadowed by a property in an extension object introduced by - // eval. - bool GlobalIfNotShadowedByEval(Handle<String> name); - - // Code generation support. - static int SlotOffset(int index) { - return kHeaderSize + index * kPointerSize - kHeapObjectTag; - } - - private: - // Unchecked access to the slots. - Object* unchecked_previous() { return get(PREVIOUS_INDEX); } - Object* unchecked_extension() { return get(EXTENSION_INDEX); } - -#ifdef DEBUG - // Bootstrapping-aware type checks. - static bool IsBootstrappingOrContext(Object* object); - static bool IsBootstrappingOrGlobalObject(Object* object); -#endif -}; - -} } // namespace v8::internal - -#endif // V8_CONTEXTS_H_ |