13ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Copyright 2012 the V8 project authors. All rights reserved. 2a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Redistribution and use in source and binary forms, with or without 3a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// modification, are permitted provided that the following conditions are 4a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// met: 5a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 6a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// * Redistributions of source code must retain the above copyright 7a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// notice, this list of conditions and the following disclaimer. 8a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// * Redistributions in binary form must reproduce the above 9a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// copyright notice, this list of conditions and the following 10a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// disclaimer in the documentation and/or other materials provided 11a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// with the distribution. 12a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// * Neither the name of Google Inc. nor the names of its 13a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// contributors may be used to endorse or promote products derived 14a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// from this software without specific prior written permission. 15a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 16a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 28a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifndef V8_CONTEXTS_H_ 29a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#define V8_CONTEXTS_H_ 30a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 3180d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen#include "heap.h" 3280d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen#include "objects.h" 3380d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen 34a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace v8 { 35a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace internal { 36a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 37a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 38a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockenum ContextLookupFlags { 39a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FOLLOW_CONTEXT_CHAIN = 1, 40a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FOLLOW_PROTOTYPE_CHAIN = 2, 41a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 42a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block DONT_FOLLOW_CHAINS = 0, 43a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN 44a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 45a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 46a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 4769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// ES5 10.2 defines lexical environments with mutable and immutable bindings. 4869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// Immutable bindings have two states, initialized and uninitialized, and 493ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// their state is changed by the InitializeImmutableBinding method. The 503ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// BindingFlags enum represents information if a binding has definitely been 513ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized. A mutable binding does not need to be checked and thus has 523ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// the BindingFlag MUTABLE_IS_INITIALIZED. 533ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// 543ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// There are two possibilities for immutable bindings 553ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * 'const' declared variables. They are initialized when evaluating the 563ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// corresponding declaration statement. They need to be checked for being 573ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized and thus get the flag IMMUTABLE_CHECK_INITIALIZED. 583ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * The function name of a named function literal. The binding is immediately 593ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized when entering the function and thus does not need to be 603ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// checked. it gets the BindingFlag IMMUTABLE_IS_INITIALIZED. 613ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Accessing an uninitialized binding produces the undefined value. 6269a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// 6369a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// The harmony proposal for block scoped bindings also introduces the 643ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// uninitialized state for mutable bindings. 653ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * A 'let' declared variable. They are initialized when evaluating the 663ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// corresponding declaration statement. They need to be checked for being 673ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized and thus get the flag MUTABLE_CHECK_INITIALIZED. 683ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * A 'var' declared variable. It is initialized immediately upon creation 693ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// and thus doesn't need to be checked. It gets the flag 703ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// MUTABLE_IS_INITIALIZED. 713ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * Catch bound variables, function parameters and variables introduced by 723ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// function declarations are initialized immediately and do not need to be 733ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// checked. Thus they get the flag MUTABLE_IS_INITIALIZED. 743ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Immutable bindings in harmony mode get the _HARMONY flag variants. Accessing 753ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// an uninitialized binding produces a reference error. 763ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// 773ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// In V8 uninitialized bindings are set to the hole value upon creation and set 783ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// to a different value upon initialization. 7969a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdochenum BindingFlags { 8069a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch MUTABLE_IS_INITIALIZED, 8169a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch MUTABLE_CHECK_INITIALIZED, 8269a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch IMMUTABLE_IS_INITIALIZED, 8369a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch IMMUTABLE_CHECK_INITIALIZED, 843ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch IMMUTABLE_IS_INITIALIZED_HARMONY, 853ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch IMMUTABLE_CHECK_INITIALIZED_HARMONY, 8669a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch MISSING_BINDING 8769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch}; 8869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch 8969a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch 90a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Heap-allocated activation contexts. 91a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 92a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Contexts are implemented as FixedArray objects; the Context 93a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// class is a convenience interface casted on a FixedArray object. 94a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 95a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Note: Context must have no virtual functions and Context objects 96a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// must always be allocated via Heap::AllocateContext() or 97a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Factory::NewContext. 98a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 99a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#define GLOBAL_CONTEXT_FIELDS(V) \ 100a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ 101a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(SECURITY_TOKEN_INDEX, Object, security_token) \ 102a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ 103a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ 104a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ 105756813857a4c2a4d8ad2e805969d5768d3cf43a0Iain Merrick V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ 106a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ 1073ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ 108a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ 1093ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(SMI_JS_ARRAY_MAP_INDEX, Object, smi_js_array_map) \ 1103ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(DOUBLE_JS_ARRAY_MAP_INDEX, Object, double_js_array_map) \ 1113ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(OBJECT_JS_ARRAY_MAP_INDEX, Object, object_js_array_map) \ 112a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ 113a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(JSON_OBJECT_INDEX, JSObject, json_object) \ 114a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ 115a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ 116a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(CREATE_DATE_FUN_INDEX, JSFunction, create_date_fun) \ 117a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun) \ 118a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun) \ 119a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_DETAIL_STRING_FUN_INDEX, JSFunction, to_detail_string_fun) \ 120a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_OBJECT_FUN_INDEX, JSFunction, to_object_fun) \ 121a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_INTEGER_FUN_INDEX, JSFunction, to_integer_fun) \ 122a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_UINT32_FUN_INDEX, JSFunction, to_uint32_fun) \ 123a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(TO_INT32_FUN_INDEX, JSFunction, to_int32_fun) \ 124e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ 125a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(INSTANTIATE_FUN_INDEX, JSFunction, instantiate_fun) \ 126a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(CONFIGURE_INSTANCE_FUN_INDEX, JSFunction, configure_instance_fun) \ 127a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(FUNCTION_MAP_INDEX, Map, function_map) \ 12844f0eee88ff00398ff7f715fab053374d808c90dSteve Block V(STRICT_MODE_FUNCTION_MAP_INDEX, Map, strict_mode_function_map) \ 1296ded16be15dd865a9b21ea304d5273c8be299c87Steve Block V(FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, function_without_prototype_map) \ 13044f0eee88ff00398ff7f715fab053374d808c90dSteve Block V(STRICT_MODE_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 13144f0eee88ff00398ff7f715fab053374d808c90dSteve Block strict_mode_function_without_prototype_map) \ 132a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(FUNCTION_INSTANCE_MAP_INDEX, Map, function_instance_map) \ 13344f0eee88ff00398ff7f715fab053374d808c90dSteve Block V(STRICT_MODE_FUNCTION_INSTANCE_MAP_INDEX, Map, \ 13444f0eee88ff00398ff7f715fab053374d808c90dSteve Block strict_mode_function_instance_map) \ 1356ded16be15dd865a9b21ea304d5273c8be299c87Steve Block V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map)\ 136a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(ARGUMENTS_BOILERPLATE_INDEX, JSObject, arguments_boilerplate) \ 1373fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch V(ALIASED_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \ 1383fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch aliased_arguments_boilerplate) \ 13944f0eee88ff00398ff7f715fab053374d808c90dSteve Block V(STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \ 14044f0eee88ff00398ff7f715fab053374d808c90dSteve Block strict_mode_arguments_boilerplate) \ 141a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \ 142a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \ 143a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \ 144a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(CONFIGURE_GLOBAL_INDEX, JSFunction, configure_global_fun) \ 145a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(FUNCTION_CACHE_INDEX, JSObject, function_cache) \ 1466ded16be15dd865a9b21ea304d5273c8be299c87Steve Block V(JSFUNCTION_RESULT_CACHES_INDEX, FixedArray, jsfunction_result_caches) \ 14780d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen V(NORMALIZED_MAP_CACHE_INDEX, NormalizedMapCache, normalized_map_cache) \ 148a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(RUNTIME_CONTEXT_INDEX, Context, runtime_context) \ 149a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ 150a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ 151a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block call_as_constructor_delegate) \ 152a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ 1536ded16be15dd865a9b21ea304d5273c8be299c87Steve Block V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ 154a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ 155a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(OUT_OF_MEMORY_INDEX, Object, out_of_memory) \ 156a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block V(MAP_CACHE_INDEX, Object, map_cache) \ 157257744e915dfc84d6d07a6b2accf8402d9ffc708Ben Murdoch V(CONTEXT_DATA_INDEX, Object, data) \ 158257744e915dfc84d6d07a6b2accf8402d9ffc708Ben Murdoch V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ 1593ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, JSFunction, \ 1603ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch to_complete_property_descriptor) \ 1613fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \ 1623fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ 1633ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(DERIVED_SET_TRAP_INDEX, JSFunction, derived_set_trap) \ 1643ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(PROXY_ENUMERATE, JSFunction, proxy_enumerate) \ 1653ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch V(RANDOM_SEED_INDEX, ByteArray, random_seed) 166a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 167a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// JSFunctions are pairs (context, function code), sometimes also called 168a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// closures. A Context object is used to represent function contexts and 169a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). 170a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 171a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// At runtime, the contexts build a stack in parallel to the execution 172a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// stack, with the top-most context being the current context. All contexts 173a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// have the following slots: 174a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 175a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ closure ] This is the current function. It is the same for all 176a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// contexts inside a function. It provides access to the 177a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// incoming context (i.e., the outer context, which may 178a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// or may not become the current function's context), and 179a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// it provides access to the functions code and thus it's 180a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// scope information, which in turn contains the names of 181a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// statically allocated context slots. The names are needed 182a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// for dynamic lookups in the presence of 'with' or 'eval'. 183a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 184a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ previous ] A pointer to the previous context. It is NULL for 185a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// function contexts, and non-NULL for 'with' contexts. 186a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Used to implement the 'with' statement. 187a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 188a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ extension ] A pointer to an extension JSObject, or NULL. Used to 189a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// implement 'with' statements and dynamic declarations 190a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// (through 'eval'). The object in a 'with' statement is 191a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// stored in the extension slot of a 'with' context. 192a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Dynamically declared variables/functions are also added 193a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// to lazily allocated extension object. Context::Lookup 194a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// searches the extension object for properties. 195a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 196a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ global ] A pointer to the global object. Provided for quick 197a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// access to the global object from inside the code (since 198a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// we always have a context pointer). 199a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 200a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// In addition, function contexts may have statically allocated context slots 201a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// to store local variables/functions that are accessed from inner functions 202a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// (via static context addresses) or through 'eval' (dynamic context lookups). 203a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Finally, the global context contains additional slots for fast access to 204a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// global properties. 205a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 206a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass Context: public FixedArray { 207a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 208a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Conversions. 209a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static Context* cast(Object* context) { 210a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(context->IsContext()); 211a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return reinterpret_cast<Context*>(context); 212a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 213a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 214a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The default context slot layout; indices are FixedArray slot indices. 215a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block enum { 216a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // These slots are in all contexts. 217a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CLOSURE_INDEX, 218a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block PREVIOUS_INDEX, 2193fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // The extension slot is used for either the global object (in global 2203fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // contexts), eval extension object (function contexts), subject of with 2213ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // (with contexts), or the variable name (catch contexts), the serialized 2223ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // scope info (block contexts). 223a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block EXTENSION_INDEX, 224a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GLOBAL_INDEX, 225a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block MIN_CONTEXT_SLOTS, 226a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 2273fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // This slot holds the thrown value in catch contexts. 2283fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, 2293fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch 230a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // These slots are only in global contexts. 231a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GLOBAL_PROXY_INDEX = MIN_CONTEXT_SLOTS, 232a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block SECURITY_TOKEN_INDEX, 233a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ARGUMENTS_BOILERPLATE_INDEX, 2343fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch ALIASED_ARGUMENTS_BOILERPLATE_INDEX, 23544f0eee88ff00398ff7f715fab053374d808c90dSteve Block STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX, 2366ded16be15dd865a9b21ea304d5273c8be299c87Steve Block REGEXP_RESULT_MAP_INDEX, 237a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FUNCTION_MAP_INDEX, 23844f0eee88ff00398ff7f715fab053374d808c90dSteve Block STRICT_MODE_FUNCTION_MAP_INDEX, 2396ded16be15dd865a9b21ea304d5273c8be299c87Steve Block FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, 24044f0eee88ff00398ff7f715fab053374d808c90dSteve Block STRICT_MODE_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, 241a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FUNCTION_INSTANCE_MAP_INDEX, 24244f0eee88ff00398ff7f715fab053374d808c90dSteve Block STRICT_MODE_FUNCTION_INSTANCE_MAP_INDEX, 243a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block INITIAL_OBJECT_PROTOTYPE_INDEX, 244a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block BOOLEAN_FUNCTION_INDEX, 245a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block NUMBER_FUNCTION_INDEX, 246a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block STRING_FUNCTION_INDEX, 247756813857a4c2a4d8ad2e805969d5768d3cf43a0Iain Merrick STRING_FUNCTION_PROTOTYPE_MAP_INDEX, 248a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block OBJECT_FUNCTION_INDEX, 2493ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch INTERNAL_ARRAY_FUNCTION_INDEX, 250a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ARRAY_FUNCTION_INDEX, 2513ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch SMI_JS_ARRAY_MAP_INDEX, 2523ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch DOUBLE_JS_ARRAY_MAP_INDEX, 2533ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch OBJECT_JS_ARRAY_MAP_INDEX, 254a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block DATE_FUNCTION_INDEX, 255a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSON_OBJECT_INDEX, 256a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block REGEXP_FUNCTION_INDEX, 257a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CREATE_DATE_FUN_INDEX, 258a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_NUMBER_FUN_INDEX, 259a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_STRING_FUN_INDEX, 260a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_DETAIL_STRING_FUN_INDEX, 261a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_OBJECT_FUN_INDEX, 262a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_INTEGER_FUN_INDEX, 263a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_UINT32_FUN_INDEX, 264a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_INT32_FUN_INDEX, 265a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_BOOLEAN_FUN_INDEX, 266e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke GLOBAL_EVAL_FUN_INDEX, 267a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block INSTANTIATE_FUN_INDEX, 268a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONFIGURE_INSTANCE_FUN_INDEX, 269a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block MESSAGE_LISTENERS_INDEX, 270a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block MAKE_MESSAGE_FUN_INDEX, 271a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GET_STACK_TRACE_LINE_INDEX, 272a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONFIGURE_GLOBAL_INDEX, 273a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FUNCTION_CACHE_INDEX, 2746ded16be15dd865a9b21ea304d5273c8be299c87Steve Block JSFUNCTION_RESULT_CACHES_INDEX, 27580d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen NORMALIZED_MAP_CACHE_INDEX, 276a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RUNTIME_CONTEXT_INDEX, 277a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CALL_AS_FUNCTION_DELEGATE_INDEX, 278a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, 279a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block SCRIPT_FUNCTION_INDEX, 2806ded16be15dd865a9b21ea304d5273c8be299c87Steve Block OPAQUE_REFERENCE_FUNCTION_INDEX, 281a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONTEXT_EXTENSION_FUNCTION_INDEX, 282a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block OUT_OF_MEMORY_INDEX, 283a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONTEXT_DATA_INDEX, 284257744e915dfc84d6d07a6b2accf8402d9ffc708Ben Murdoch ALLOW_CODE_GEN_FROM_STRINGS_INDEX, 2853ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, 2863fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch DERIVED_HAS_TRAP_INDEX, 287257744e915dfc84d6d07a6b2accf8402d9ffc708Ben Murdoch DERIVED_GET_TRAP_INDEX, 2883fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch DERIVED_SET_TRAP_INDEX, 2893ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch PROXY_ENUMERATE, 2903ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch RANDOM_SEED_INDEX, 291f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 292f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // Properties from here are treated as weak references by the full GC. 293f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // Scavenge treats them as strong references. 294b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch OPTIMIZED_FUNCTIONS_LIST, // Weak. 2953fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch MAP_CACHE_INDEX, // Weak. 296b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch NEXT_CONTEXT_LINK, // Weak. 297f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 298f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // Total number of slots. 299f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch GLOBAL_CONTEXT_SLOTS, 300f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 301b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST 302a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block }; 303a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 304a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Direct slot access. 305a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSFunction* closure() { return JSFunction::cast(get(CLOSURE_INDEX)); } 306a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); } 307a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 308a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Context* previous() { 309a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Object* result = unchecked_previous(); 310a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(IsBootstrappingOrContext(result)); 311a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return reinterpret_cast<Context*>(result); 312a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 313a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_previous(Context* context) { set(PREVIOUS_INDEX, context); } 314a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 3153fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool has_extension() { return extension() != NULL; } 3163fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Object* extension() { return get(EXTENSION_INDEX); } 3173fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch void set_extension(Object* object) { set(EXTENSION_INDEX, object); } 3183fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch 3193fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // Get the context where var declarations will be hoisted to, which 3203fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // may be the context itself. 3213fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Context* declaration_context(); 322a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 323a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GlobalObject* global() { 324a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Object* result = get(GLOBAL_INDEX); 32544f0eee88ff00398ff7f715fab053374d808c90dSteve Block ASSERT(IsBootstrappingOrGlobalObject(result)); 326a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return reinterpret_cast<GlobalObject*>(result); 327a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 328a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_global(GlobalObject* global) { set(GLOBAL_INDEX, global); } 329a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 330a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Returns a JSGlobalProxy object or null. 331a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSObject* global_proxy(); 332a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_global_proxy(JSObject* global); 333a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 334a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The builtins object. 335a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSBuiltinsObject* builtins(); 336a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 337a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Compute the global context by traversing the context chain. 338a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Context* global_context(); 339a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 3403fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // Predicates for context types. IsGlobalContext is defined on Object 3413fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // because we frequently have to know if arbitrary objects are global 3423fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // contexts. 3433fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool IsFunctionContext() { 3443fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Map* map = this->map(); 3453fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch return map == map->GetHeap()->function_context_map(); 3463fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch } 3473fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool IsCatchContext() { 3483fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Map* map = this->map(); 3493fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch return map == map->GetHeap()->catch_context_map(); 3503fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch } 3513fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool IsWithContext() { 3523fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Map* map = this->map(); 3533fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch return map == map->GetHeap()->with_context_map(); 3543fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch } 35569a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch bool IsBlockContext() { 35669a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch Map* map = this->map(); 35769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch return map == map->GetHeap()->block_context_map(); 35869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch } 3593ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch bool IsModuleContext() { 3603ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch Map* map = this->map(); 3613ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch return map == map->GetHeap()->module_context_map(); 3623ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch } 363a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 364a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Tells whether the global context is marked with out of memory. 36544f0eee88ff00398ff7f715fab053374d808c90dSteve Block inline bool has_out_of_memory(); 366a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 367a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Mark the global context with out of memory. 36844f0eee88ff00398ff7f715fab053374d808c90dSteve Block inline void mark_out_of_memory(); 369a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 370b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch // A global context hold a list of all functions which have been optimized. 371b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch void AddOptimizedFunction(JSFunction* function); 372b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch void RemoveOptimizedFunction(JSFunction* function); 373b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch Object* OptimizedFunctionsListHead(); 374b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch void ClearOptimizedFunctions(); 375b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch 3763ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch static int GetContextMapIndexFromElementsKind( 3773ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch ElementsKind elements_kind) { 3783ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch if (elements_kind == FAST_DOUBLE_ELEMENTS) { 3793ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch return Context::DOUBLE_JS_ARRAY_MAP_INDEX; 3803ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch } else if (elements_kind == FAST_ELEMENTS) { 3813ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch return Context::OBJECT_JS_ARRAY_MAP_INDEX; 3823ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch } else { 3833ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch ASSERT(elements_kind == FAST_SMI_ONLY_ELEMENTS); 3843ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch return Context::SMI_JS_ARRAY_MAP_INDEX; 3853ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch } 3863ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch } 3873ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 388a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#define GLOBAL_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 389a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_##name(type* value) { \ 390a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(IsGlobalContext()); \ 391a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block set(index, value); \ 392a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } \ 393a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block type* name() { \ 394a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ASSERT(IsGlobalContext()); \ 395a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return type::cast(get(index)); \ 396a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 397a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GLOBAL_CONTEXT_FIELDS(GLOBAL_CONTEXT_FIELD_ACCESSORS) 398a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#undef GLOBAL_CONTEXT_FIELD_ACCESSORS 399a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 400a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Lookup the the slot called name, starting with the current context. 4013ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // There are three possibilities: 402a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 4033ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // 1) result->IsContext(): 4043ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // The binding was found in a context. *index is always the 4053ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // non-negative slot index. *attributes is NONE for var and let 4063ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // declarations, READ_ONLY for const declarations (never ABSENT). 407a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 4083ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // 2) result->IsJSObject(): 4093ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // The binding was found as a named property in a context extension 4103ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // object (i.e., was introduced via eval), as a property on the subject 4113ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // of with, or as a property of the global object. *index is -1 and 4123ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // *attributes is not ABSENT. 413a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 4143ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // 3) result.is_null(): 4153ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // There was no binding found, *index is always -1 and *attributes is 4163ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // always ABSENT. 41769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch Handle<Object> Lookup(Handle<String> name, 41869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch ContextLookupFlags flags, 4193ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch int* index, 42069a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch PropertyAttributes* attributes, 42169a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch BindingFlags* binding_flags); 422a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 423a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Code generation support. 424a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static int SlotOffset(int index) { 425a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return kHeaderSize + index * kPointerSize - kHeapObjectTag; 426a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 427a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 428f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch static const int kSize = kHeaderSize + GLOBAL_CONTEXT_SLOTS * kPointerSize; 429f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 430f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // GC support. 431f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch typedef FixedBodyDescriptor< 432f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kHeaderSize, kSize, kSize> ScavengeBodyDescriptor; 433f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 434f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch typedef FixedBodyDescriptor< 435f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kHeaderSize, 436f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, 437f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kSize> MarkCompactBodyDescriptor; 438f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 439a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 440a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Unchecked access to the slots. 441a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Object* unchecked_previous() { return get(PREVIOUS_INDEX); } 442a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 443a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef DEBUG 444a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Bootstrapping-aware type checks. 445a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static bool IsBootstrappingOrContext(Object* object); 446a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static bool IsBootstrappingOrGlobalObject(Object* object); 447a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 448a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 449a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 450a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} } // namespace v8::internal 451a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 452a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif // V8_CONTEXTS_H_ 453