contexts.h revision 958fae7ec3f466955f8e5b50fa5b8d38b9e91675
13ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Copyright 2012 the V8 project authors. All rights reserved. 2b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// Use of this source code is governed by a BSD-style license that can be 3b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// found in the LICENSE file. 4a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 5a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifndef V8_CONTEXTS_H_ 6a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#define V8_CONTEXTS_H_ 7a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 8b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch#include "src/heap/heap.h" 9b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch#include "src/objects.h" 1080d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen 11a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace v8 { 12a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blocknamespace internal { 13a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 14a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 15a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockenum ContextLookupFlags { 16a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FOLLOW_CONTEXT_CHAIN = 1, 17a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FOLLOW_PROTOTYPE_CHAIN = 2, 18a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 19a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block DONT_FOLLOW_CHAINS = 0, 20a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FOLLOW_CHAINS = FOLLOW_CONTEXT_CHAIN | FOLLOW_PROTOTYPE_CHAIN 21a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 22a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 23a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 2469a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// ES5 10.2 defines lexical environments with mutable and immutable bindings. 2569a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// Immutable bindings have two states, initialized and uninitialized, and 263ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// their state is changed by the InitializeImmutableBinding method. The 273ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// BindingFlags enum represents information if a binding has definitely been 283ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized. A mutable binding does not need to be checked and thus has 293ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// the BindingFlag MUTABLE_IS_INITIALIZED. 303ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// 313ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// There are two possibilities for immutable bindings 323ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * 'const' declared variables. They are initialized when evaluating the 333ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// corresponding declaration statement. They need to be checked for being 343ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized and thus get the flag IMMUTABLE_CHECK_INITIALIZED. 353ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * The function name of a named function literal. The binding is immediately 363ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized when entering the function and thus does not need to be 373ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// checked. it gets the BindingFlag IMMUTABLE_IS_INITIALIZED. 383ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Accessing an uninitialized binding produces the undefined value. 3969a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// 4069a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch// The harmony proposal for block scoped bindings also introduces the 413ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// uninitialized state for mutable bindings. 423ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * A 'let' declared variable. They are initialized when evaluating the 433ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// corresponding declaration statement. They need to be checked for being 443ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// initialized and thus get the flag MUTABLE_CHECK_INITIALIZED. 453ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * A 'var' declared variable. It is initialized immediately upon creation 463ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// and thus doesn't need to be checked. It gets the flag 473ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// MUTABLE_IS_INITIALIZED. 483ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// * Catch bound variables, function parameters and variables introduced by 493ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// function declarations are initialized immediately and do not need to be 503ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// checked. Thus they get the flag MUTABLE_IS_INITIALIZED. 513ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// Immutable bindings in harmony mode get the _HARMONY flag variants. Accessing 523ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// an uninitialized binding produces a reference error. 533ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// 543ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// In V8 uninitialized bindings are set to the hole value upon creation and set 553ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch// to a different value upon initialization. 5669a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdochenum BindingFlags { 5769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch MUTABLE_IS_INITIALIZED, 5869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch MUTABLE_CHECK_INITIALIZED, 5969a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch IMMUTABLE_IS_INITIALIZED, 6069a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch IMMUTABLE_CHECK_INITIALIZED, 613ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch IMMUTABLE_IS_INITIALIZED_HARMONY, 623ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch IMMUTABLE_CHECK_INITIALIZED_HARMONY, 6369a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch MISSING_BINDING 6469a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch}; 6569a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch 6669a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch 67a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Heap-allocated activation contexts. 68a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 69a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Contexts are implemented as FixedArray objects; the Context 70a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// class is a convenience interface casted on a FixedArray object. 71a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 72a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Note: Context must have no virtual functions and Context objects 73a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// must always be allocated via Heap::AllocateContext() or 74a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Factory::NewContext. 75a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 76b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch#define NATIVE_CONTEXT_FIELDS(V) \ 77b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(GLOBAL_PROXY_INDEX, JSObject, global_proxy_object) \ 78b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SECURITY_TOKEN_INDEX, Object, security_token) \ 79b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(BOOLEAN_FUNCTION_INDEX, JSFunction, boolean_function) \ 80b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(NUMBER_FUNCTION_INDEX, JSFunction, number_function) \ 81b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(STRING_FUNCTION_INDEX, JSFunction, string_function) \ 82b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(STRING_FUNCTION_PROTOTYPE_MAP_INDEX, Map, string_function_prototype_map) \ 83b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SYMBOL_FUNCTION_INDEX, JSFunction, symbol_function) \ 84b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(OBJECT_FUNCTION_INDEX, JSFunction, object_function) \ 85b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INTERNAL_ARRAY_FUNCTION_INDEX, JSFunction, internal_array_function) \ 86b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(ARRAY_FUNCTION_INDEX, JSFunction, array_function) \ 87b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(JS_ARRAY_MAPS_INDEX, Object, js_array_maps) \ 88b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(DATE_FUNCTION_INDEX, JSFunction, date_function) \ 89b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(JSON_OBJECT_INDEX, JSObject, json_object) \ 90b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(REGEXP_FUNCTION_INDEX, JSFunction, regexp_function) \ 91b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype) \ 92b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype) \ 93b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(CREATE_DATE_FUN_INDEX, JSFunction, create_date_fun) \ 94b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun) \ 95b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun) \ 96b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_DETAIL_STRING_FUN_INDEX, JSFunction, to_detail_string_fun) \ 97b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_OBJECT_FUN_INDEX, JSFunction, to_object_fun) \ 98b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_INTEGER_FUN_INDEX, JSFunction, to_integer_fun) \ 99b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_UINT32_FUN_INDEX, JSFunction, to_uint32_fun) \ 100b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_INT32_FUN_INDEX, JSFunction, to_int32_fun) \ 101958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier V(TO_LENGTH_FUN_INDEX, JSFunction, to_length_fun) \ 102b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(GLOBAL_EVAL_FUN_INDEX, JSFunction, global_eval_fun) \ 103b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INSTANTIATE_FUN_INDEX, JSFunction, instantiate_fun) \ 104b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(CONFIGURE_INSTANCE_FUN_INDEX, JSFunction, configure_instance_fun) \ 105b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(ARRAY_BUFFER_FUN_INDEX, JSFunction, array_buffer_fun) \ 106b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT8_ARRAY_FUN_INDEX, JSFunction, uint8_array_fun) \ 107b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INT8_ARRAY_FUN_INDEX, JSFunction, int8_array_fun) \ 108b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT16_ARRAY_FUN_INDEX, JSFunction, uint16_array_fun) \ 109b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INT16_ARRAY_FUN_INDEX, JSFunction, int16_array_fun) \ 110b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT32_ARRAY_FUN_INDEX, JSFunction, uint32_array_fun) \ 111b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INT32_ARRAY_FUN_INDEX, JSFunction, int32_array_fun) \ 112b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun) \ 113b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun) \ 114b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT8_CLAMPED_ARRAY_FUN_INDEX, JSFunction, uint8_clamped_array_fun) \ 115b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INT8_ARRAY_EXTERNAL_MAP_INDEX, Map, int8_array_external_map) \ 116b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT8_ARRAY_EXTERNAL_MAP_INDEX, Map, uint8_array_external_map) \ 117b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INT16_ARRAY_EXTERNAL_MAP_INDEX, Map, int16_array_external_map) \ 118b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT16_ARRAY_EXTERNAL_MAP_INDEX, Map, uint16_array_external_map) \ 119b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(INT32_ARRAY_EXTERNAL_MAP_INDEX, Map, int32_array_external_map) \ 120b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT32_ARRAY_EXTERNAL_MAP_INDEX, Map, uint32_array_external_map) \ 121b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(FLOAT32_ARRAY_EXTERNAL_MAP_INDEX, Map, float32_array_external_map) \ 122b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(FLOAT64_ARRAY_EXTERNAL_MAP_INDEX, Map, float64_array_external_map) \ 123b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(UINT8_CLAMPED_ARRAY_EXTERNAL_MAP_INDEX, Map, \ 124b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch uint8_clamped_array_external_map) \ 125b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \ 126b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \ 127b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \ 128b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch sloppy_function_with_readonly_prototype_map) \ 129b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \ 130b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 131b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch sloppy_function_without_prototype_map) \ 132b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \ 133b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch strict_function_without_prototype_map) \ 134b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(BOUND_FUNCTION_MAP_INDEX, Map, bound_function_map) \ 135b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map) \ 136b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map) \ 137b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(ALIASED_ARGUMENTS_MAP_INDEX, Map, aliased_arguments_map) \ 138b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map) \ 139b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \ 140b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \ 141b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \ 142b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(CONFIGURE_GLOBAL_INDEX, JSFunction, configure_global_fun) \ 143b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(FUNCTION_CACHE_INDEX, JSObject, function_cache) \ 144b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(JSFUNCTION_RESULT_CACHES_INDEX, FixedArray, jsfunction_result_caches) \ 145b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache) \ 146b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(RUNTIME_CONTEXT_INDEX, Context, runtime_context) \ 147b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate) \ 148b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction, \ 149b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch call_as_constructor_delegate) \ 150b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function) \ 151b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function) \ 152b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function) \ 153b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(MAP_CACHE_INDEX, Object, map_cache) \ 154b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(EMBEDDER_DATA_INDEX, FixedArray, embedder_data) \ 155b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(ALLOW_CODE_GEN_FROM_STRINGS_INDEX, Object, allow_code_gen_from_strings) \ 156b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \ 157b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch error_message_for_code_gen_from_strings) \ 158b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(IS_PROMISE_INDEX, JSFunction, is_promise) \ 159b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROMISE_CREATE_INDEX, JSFunction, promise_create) \ 160b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROMISE_RESOLVE_INDEX, JSFunction, promise_resolve) \ 161b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROMISE_REJECT_INDEX, JSFunction, promise_reject) \ 162b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROMISE_CHAIN_INDEX, JSFunction, promise_chain) \ 163b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROMISE_CATCH_INDEX, JSFunction, promise_catch) \ 164b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROMISE_THEN_INDEX, JSFunction, promise_then) \ 165b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, JSFunction, \ 166b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch to_complete_property_descriptor) \ 167b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \ 168b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \ 169b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(DERIVED_SET_TRAP_INDEX, JSFunction, derived_set_trap) \ 170b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(PROXY_ENUMERATE_INDEX, JSFunction, proxy_enumerate) \ 171b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(OBSERVERS_NOTIFY_CHANGE_INDEX, JSFunction, observers_notify_change) \ 172b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(OBSERVERS_ENQUEUE_SPLICE_INDEX, JSFunction, observers_enqueue_splice) \ 173b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(OBSERVERS_BEGIN_SPLICE_INDEX, JSFunction, observers_begin_perform_splice) \ 174b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(OBSERVERS_END_SPLICE_INDEX, JSFunction, observers_end_perform_splice) \ 175b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(NATIVE_OBJECT_OBSERVE_INDEX, JSFunction, native_object_observe) \ 176b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(NATIVE_OBJECT_GET_NOTIFIER_INDEX, JSFunction, native_object_get_notifier) \ 177b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(NATIVE_OBJECT_NOTIFIER_PERFORM_CHANGE, JSFunction, \ 178b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch native_object_notifier_perform_change) \ 179b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SLOPPY_GENERATOR_FUNCTION_MAP_INDEX, Map, sloppy_generator_function_map) \ 180b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(STRICT_GENERATOR_FUNCTION_MAP_INDEX, Map, strict_generator_function_map) \ 181b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \ 182b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(ITERATOR_RESULT_MAP_INDEX, Map, iterator_result_map) \ 183b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(MAP_ITERATOR_MAP_INDEX, Map, map_iterator_map) \ 184b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch V(SET_ITERATOR_MAP_INDEX, Map, set_iterator_map) \ 185958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier V(ARRAY_VALUES_ITERATOR_INDEX, JSFunction, array_values_iterator) \ 186958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier V(SCRIPT_CONTEXT_TABLE_INDEX, ScriptContextTable, script_context_table) 187958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 188958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 189958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// A table of all script contexts. Every loaded top-level script with top-level 190958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// lexical declarations contributes its ScriptContext into this table. 191958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// 192958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// The table is a fixed array, its first slot is the current used count and 193958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// the subsequent slots 1..used contain ScriptContexts. 194958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernierclass ScriptContextTable : public FixedArray { 195958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier public: 196958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier // Conversions. 197958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static ScriptContextTable* cast(Object* context) { 198958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier DCHECK(context->IsScriptContextTable()); 199958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier return reinterpret_cast<ScriptContextTable*>(context); 200958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier } 201958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 202958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier struct LookupResult { 203958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier int context_index; 204958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier int slot_index; 205958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier VariableMode mode; 206958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier InitializationFlag init_flag; 207958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier MaybeAssignedFlag maybe_assigned_flag; 208958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier }; 209958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 210958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier int used() const { return Smi::cast(get(kUsedSlot))->value(); } 211958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 212958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier void set_used(int used) { set(kUsedSlot, Smi::FromInt(used)); } 213958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 214958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static Handle<Context> GetContext(Handle<ScriptContextTable> table, int i) { 215958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier DCHECK(i < table->used()); 216958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier return Handle<Context>::cast(FixedArray::get(table, i + 1)); 217958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier } 218958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 219958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier // Lookup a variable `name` in a ScriptContextTable. 220958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier // If it returns true, the variable is found and `result` contains 221958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier // valid information about its location. 222958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier // If it returns false, `result` is untouched. 223958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier MUST_USE_RESULT 224958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static bool Lookup(Handle<ScriptContextTable> table, Handle<String> name, 225958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier LookupResult* result); 226958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 227958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier MUST_USE_RESULT 228958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static Handle<ScriptContextTable> Extend(Handle<ScriptContextTable> table, 229958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier Handle<Context> script_context); 230958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 231958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static int GetContextOffset(int context_index) { 232958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier return kFirstContextOffset + context_index * kPointerSize; 233958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier } 234958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 235958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier private: 236958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static const int kUsedSlot = 0; 237958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier static const int kFirstContextOffset = 238958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier FixedArray::kHeaderSize + (kUsedSlot + 1) * kPointerSize; 239958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier 240958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier DISALLOW_IMPLICIT_CONSTRUCTORS(ScriptContextTable); 241958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier}; 242a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 243a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// JSFunctions are pairs (context, function code), sometimes also called 244a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// closures. A Context object is used to represent function contexts and 245a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). 246a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 247a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// At runtime, the contexts build a stack in parallel to the execution 248a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// stack, with the top-most context being the current context. All contexts 249a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// have the following slots: 250a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 251a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ closure ] This is the current function. It is the same for all 252a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// contexts inside a function. It provides access to the 253a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// incoming context (i.e., the outer context, which may 254a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// or may not become the current function's context), and 255a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// it provides access to the functions code and thus it's 256a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// scope information, which in turn contains the names of 257a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// statically allocated context slots. The names are needed 258a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// for dynamic lookups in the presence of 'with' or 'eval'. 259a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 260a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ previous ] A pointer to the previous context. It is NULL for 261a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// function contexts, and non-NULL for 'with' contexts. 262a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Used to implement the 'with' statement. 263a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 264a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// [ extension ] A pointer to an extension JSObject, or NULL. Used to 265a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// implement 'with' statements and dynamic declarations 266a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// (through 'eval'). The object in a 'with' statement is 267a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// stored in the extension slot of a 'with' context. 268a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// Dynamically declared variables/functions are also added 269a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// to lazily allocated extension object. Context::Lookup 270a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// searches the extension object for properties. 271b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// For global and block contexts, contains the respective 272b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// ScopeInfo. 273b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// For module contexts, points back to the respective JSModule. 274a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 275b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// [ global_object ] A pointer to the global object. Provided for quick 276a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// access to the global object from inside the code (since 277a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// we always have a context pointer). 278a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// 279a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// In addition, function contexts may have statically allocated context slots 280a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// to store local variables/functions that are accessed from inner functions 281a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block// (via static context addresses) or through 'eval' (dynamic context lookups). 282b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// The native context contains additional slots for fast access to native 283b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// properties. 284b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// 285b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// Finally, with Harmony scoping, the JSFunction representing a top level 286958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// script will have the ScriptContext rather than a FunctionContext. 287958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// Script contexts from all top-level scripts are gathered in 288958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier// ScriptContextTable. 289a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 290a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Blockclass Context: public FixedArray { 291a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block public: 292a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Conversions. 293a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static Context* cast(Object* context) { 294b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DCHECK(context->IsContext()); 295a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return reinterpret_cast<Context*>(context); 296a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 297a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 298a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The default context slot layout; indices are FixedArray slot indices. 299a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block enum { 300a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // These slots are in all contexts. 301a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CLOSURE_INDEX, 302a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block PREVIOUS_INDEX, 3033fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // The extension slot is used for either the global object (in global 3043fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // contexts), eval extension object (function contexts), subject of with 3053ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // (with contexts), or the variable name (catch contexts), the serialized 306b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // scope info (block contexts), or the module instance (module contexts). 307a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block EXTENSION_INDEX, 308b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch GLOBAL_OBJECT_INDEX, 309a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block MIN_CONTEXT_SLOTS, 310a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 3113fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // This slot holds the thrown value in catch contexts. 3123fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS, 3133fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch 314b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // These slots are only in native contexts. 315a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GLOBAL_PROXY_INDEX = MIN_CONTEXT_SLOTS, 316a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block SECURITY_TOKEN_INDEX, 317b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SLOPPY_ARGUMENTS_MAP_INDEX, 318b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ALIASED_ARGUMENTS_MAP_INDEX, 319b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch STRICT_ARGUMENTS_MAP_INDEX, 3206ded16be15dd865a9b21ea304d5273c8be299c87Steve Block REGEXP_RESULT_MAP_INDEX, 321b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SLOPPY_FUNCTION_MAP_INDEX, 322b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, 323b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch STRICT_FUNCTION_MAP_INDEX, 324b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, 325b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, 326b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch BOUND_FUNCTION_MAP_INDEX, 327a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block INITIAL_OBJECT_PROTOTYPE_INDEX, 328b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INITIAL_ARRAY_PROTOTYPE_INDEX, 329a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block BOOLEAN_FUNCTION_INDEX, 330a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block NUMBER_FUNCTION_INDEX, 331a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block STRING_FUNCTION_INDEX, 332756813857a4c2a4d8ad2e805969d5768d3cf43a0Iain Merrick STRING_FUNCTION_PROTOTYPE_MAP_INDEX, 333b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SYMBOL_FUNCTION_INDEX, 334a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block OBJECT_FUNCTION_INDEX, 3353ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch INTERNAL_ARRAY_FUNCTION_INDEX, 336a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block ARRAY_FUNCTION_INDEX, 337b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch JS_ARRAY_MAPS_INDEX, 338a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block DATE_FUNCTION_INDEX, 339a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSON_OBJECT_INDEX, 340a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block REGEXP_FUNCTION_INDEX, 341a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CREATE_DATE_FUN_INDEX, 342a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_NUMBER_FUN_INDEX, 343a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_STRING_FUN_INDEX, 344a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_DETAIL_STRING_FUN_INDEX, 345a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_OBJECT_FUN_INDEX, 346a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_INTEGER_FUN_INDEX, 347a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_UINT32_FUN_INDEX, 348a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_INT32_FUN_INDEX, 349a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block TO_BOOLEAN_FUN_INDEX, 350e46be819fca9468a0cd4e74859ce0f778eb8ca60Leon Clarke GLOBAL_EVAL_FUN_INDEX, 351a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block INSTANTIATE_FUN_INDEX, 352a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONFIGURE_INSTANCE_FUN_INDEX, 353b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ARRAY_BUFFER_FUN_INDEX, 354b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT8_ARRAY_FUN_INDEX, 355b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INT8_ARRAY_FUN_INDEX, 356b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT16_ARRAY_FUN_INDEX, 357b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INT16_ARRAY_FUN_INDEX, 358b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT32_ARRAY_FUN_INDEX, 359b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INT32_ARRAY_FUN_INDEX, 360b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch FLOAT32_ARRAY_FUN_INDEX, 361b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch FLOAT64_ARRAY_FUN_INDEX, 362b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT8_CLAMPED_ARRAY_FUN_INDEX, 363b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INT8_ARRAY_EXTERNAL_MAP_INDEX, 364b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT8_ARRAY_EXTERNAL_MAP_INDEX, 365b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INT16_ARRAY_EXTERNAL_MAP_INDEX, 366b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT16_ARRAY_EXTERNAL_MAP_INDEX, 367b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch INT32_ARRAY_EXTERNAL_MAP_INDEX, 368b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT32_ARRAY_EXTERNAL_MAP_INDEX, 369b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch FLOAT32_ARRAY_EXTERNAL_MAP_INDEX, 370b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch FLOAT64_ARRAY_EXTERNAL_MAP_INDEX, 371b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch UINT8_CLAMPED_ARRAY_EXTERNAL_MAP_INDEX, 372b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DATA_VIEW_FUN_INDEX, 373a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block MESSAGE_LISTENERS_INDEX, 374a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block MAKE_MESSAGE_FUN_INDEX, 375a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block GET_STACK_TRACE_LINE_INDEX, 376a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONFIGURE_GLOBAL_INDEX, 377a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block FUNCTION_CACHE_INDEX, 3786ded16be15dd865a9b21ea304d5273c8be299c87Steve Block JSFUNCTION_RESULT_CACHES_INDEX, 37980d68eab642096c1a48b6474d6ec33064b0ad1f5Kristian Monsen NORMALIZED_MAP_CACHE_INDEX, 380a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block RUNTIME_CONTEXT_INDEX, 381a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CALL_AS_FUNCTION_DELEGATE_INDEX, 382a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, 383a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block SCRIPT_FUNCTION_INDEX, 3846ded16be15dd865a9b21ea304d5273c8be299c87Steve Block OPAQUE_REFERENCE_FUNCTION_INDEX, 385a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block CONTEXT_EXTENSION_FUNCTION_INDEX, 386a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block OUT_OF_MEMORY_INDEX, 387b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch EMBEDDER_DATA_INDEX, 388257744e915dfc84d6d07a6b2accf8402d9ffc708Ben Murdoch ALLOW_CODE_GEN_FROM_STRINGS_INDEX, 389b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, 390b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch RUN_MICROTASKS_INDEX, 391b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ENQUEUE_MICROTASK_INDEX, 392b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch IS_PROMISE_INDEX, 393b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROMISE_CREATE_INDEX, 394b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROMISE_RESOLVE_INDEX, 395b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROMISE_REJECT_INDEX, 396b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROMISE_CHAIN_INDEX, 397b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROMISE_CATCH_INDEX, 398b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROMISE_THEN_INDEX, 3993ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, 4003fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch DERIVED_HAS_TRAP_INDEX, 401257744e915dfc84d6d07a6b2accf8402d9ffc708Ben Murdoch DERIVED_GET_TRAP_INDEX, 4023fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch DERIVED_SET_TRAP_INDEX, 403b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch PROXY_ENUMERATE_INDEX, 404b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch OBSERVERS_NOTIFY_CHANGE_INDEX, 405b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch OBSERVERS_ENQUEUE_SPLICE_INDEX, 406b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch OBSERVERS_BEGIN_SPLICE_INDEX, 407b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch OBSERVERS_END_SPLICE_INDEX, 408b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch NATIVE_OBJECT_OBSERVE_INDEX, 409b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch NATIVE_OBJECT_GET_NOTIFIER_INDEX, 410b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch NATIVE_OBJECT_NOTIFIER_PERFORM_CHANGE, 411b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SLOPPY_GENERATOR_FUNCTION_MAP_INDEX, 412b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch STRICT_GENERATOR_FUNCTION_MAP_INDEX, 413b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, 414b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ITERATOR_RESULT_MAP_INDEX, 415b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch MAP_ITERATOR_MAP_INDEX, 416b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch SET_ITERATOR_MAP_INDEX, 417b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ARRAY_VALUES_ITERATOR_INDEX, 418958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier SCRIPT_CONTEXT_TABLE_INDEX, 419958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier MAP_CACHE_INDEX, 420958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier TO_LENGTH_FUN_INDEX, 421f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 422f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // Properties from here are treated as weak references by the full GC. 423f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // Scavenge treats them as strong references. 424b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch OPTIMIZED_FUNCTIONS_LIST, // Weak. 425b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch OPTIMIZED_CODE_LIST, // Weak. 426b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DEOPTIMIZED_CODE_LIST, // Weak. 427b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch NEXT_CONTEXT_LINK, // Weak. 428f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 429f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // Total number of slots. 430b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch NATIVE_CONTEXT_SLOTS, 431b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST 432a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block }; 433a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 434a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Direct slot access. 435a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSFunction* closure() { return JSFunction::cast(get(CLOSURE_INDEX)); } 436a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_closure(JSFunction* closure) { set(CLOSURE_INDEX, closure); } 437a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 438a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Context* previous() { 439a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Object* result = unchecked_previous(); 440b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DCHECK(IsBootstrappingOrValidParentContext(result, this)); 441a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return reinterpret_cast<Context*>(result); 442a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 443a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_previous(Context* context) { set(PREVIOUS_INDEX, context); } 444a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 4453fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool has_extension() { return extension() != NULL; } 4463fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Object* extension() { return get(EXTENSION_INDEX); } 4473fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch void set_extension(Object* object) { set(EXTENSION_INDEX, object); } 4483fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch 449b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch JSModule* module() { return JSModule::cast(get(EXTENSION_INDEX)); } 450b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch void set_module(JSModule* module) { set(EXTENSION_INDEX, module); } 451b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 4523fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // Get the context where var declarations will be hoisted to, which 4533fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // may be the context itself. 4543fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Context* declaration_context(); 455a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 456b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch GlobalObject* global_object() { 457b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Object* result = get(GLOBAL_OBJECT_INDEX); 458b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DCHECK(IsBootstrappingOrGlobalObject(this->GetIsolate(), result)); 459a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return reinterpret_cast<GlobalObject*>(result); 460a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 461b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch void set_global_object(GlobalObject* object) { 462b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch set(GLOBAL_OBJECT_INDEX, object); 463b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 464a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 465a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Returns a JSGlobalProxy object or null. 466a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSObject* global_proxy(); 467a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_global_proxy(JSObject* global); 468a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 469a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // The builtins object. 470a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block JSBuiltinsObject* builtins(); 471a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 472958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier // Get the script context by traversing the context chain. 473958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier Context* script_context(); 474a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 475b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // Compute the native context by traversing the context chain. 476b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Context* native_context(); 477b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 478b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // Predicates for context types. IsNativeContext is also defined on Object 479b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // because we frequently have to know if arbitrary objects are natives 4803fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch // contexts. 481b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch bool IsNativeContext() { 482b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Map* map = this->map(); 483b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch return map == map->GetHeap()->native_context_map(); 484b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 4853fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool IsFunctionContext() { 4863fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Map* map = this->map(); 4873fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch return map == map->GetHeap()->function_context_map(); 4883fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch } 4893fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool IsCatchContext() { 4903fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Map* map = this->map(); 4913fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch return map == map->GetHeap()->catch_context_map(); 4923fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch } 4933fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch bool IsWithContext() { 4943fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch Map* map = this->map(); 4953fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch return map == map->GetHeap()->with_context_map(); 4963fb3ca8c7ca439d408449a395897395c0faae8d1Ben Murdoch } 49769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch bool IsBlockContext() { 49869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch Map* map = this->map(); 49969a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch return map == map->GetHeap()->block_context_map(); 50069a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch } 5013ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch bool IsModuleContext() { 5023ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch Map* map = this->map(); 5033ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch return map == map->GetHeap()->module_context_map(); 5043ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch } 505958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier bool IsScriptContext() { 506b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Map* map = this->map(); 507958fae7ec3f466955f8e5b50fa5b8d38b9e91675Emily Bernier return map == map->GetHeap()->script_context_map(); 508b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 509a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 510b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch bool HasSameSecurityTokenAs(Context* that) { 511b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch return this->global_object()->native_context()->security_token() == 512b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch that->global_object()->native_context()->security_token(); 513b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 514a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 515b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // A native context holds a list of all functions with optimized code. 516b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch void AddOptimizedFunction(JSFunction* function); 517b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch void RemoveOptimizedFunction(JSFunction* function); 518b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch void SetOptimizedFunctionsListHead(Object* head); 519b0fe1620dcb4135ac3ab2d66ff93072373911299Ben Murdoch Object* OptimizedFunctionsListHead(); 5203ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch 521b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // The native context also stores a list of all optimized code and a 522b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // list of all deoptimized code, which are needed by the deoptimizer. 523b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch void AddOptimizedCode(Code* code); 524b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch void SetOptimizedCodeListHead(Object* head); 525b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Object* OptimizedCodeListHead(); 526b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch void SetDeoptimizedCodeListHead(Object* head); 527b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Object* DeoptimizedCodeListHead(); 528b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 529b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch Handle<Object> ErrorMessageForCodeGenerationFromStrings(); 530b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 531b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch#define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \ 532a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block void set_##name(type* value) { \ 533b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DCHECK(IsNativeContext()); \ 534a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block set(index, value); \ 535a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } \ 536b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch bool is_##name(type* value) { \ 537b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DCHECK(IsNativeContext()); \ 538b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch return type::cast(get(index)) == value; \ 539b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } \ 540a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block type* name() { \ 541b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch DCHECK(IsNativeContext()); \ 542a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return type::cast(get(index)); \ 543a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 544b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS) 545b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch#undef NATIVE_CONTEXT_FIELD_ACCESSORS 546a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 547b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch // Lookup the slot called name, starting with the current context. 5483ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // There are three possibilities: 549a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 5503ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // 1) result->IsContext(): 5513ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // The binding was found in a context. *index is always the 5523ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // non-negative slot index. *attributes is NONE for var and let 5533ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // declarations, READ_ONLY for const declarations (never ABSENT). 554a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 5553ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // 2) result->IsJSObject(): 5563ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // The binding was found as a named property in a context extension 5573ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // object (i.e., was introduced via eval), as a property on the subject 5583ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // of with, or as a property of the global object. *index is -1 and 5593ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // *attributes is not ABSENT. 560a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // 5613ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // 3) result.is_null(): 5623ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // There was no binding found, *index is always -1 and *attributes is 5633ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch // always ABSENT. 56469a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch Handle<Object> Lookup(Handle<String> name, 56569a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch ContextLookupFlags flags, 5663ef787dbeca8a5fb1086949cda830dccee07bfbdBen Murdoch int* index, 56769a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch PropertyAttributes* attributes, 56869a99ed0b2b2ef69d393c371b03db3a98aaf880eBen Murdoch BindingFlags* binding_flags); 569a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 570a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Code generation support. 571a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block static int SlotOffset(int index) { 572a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block return kHeaderSize + index * kPointerSize - kHeapObjectTag; 573a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block } 574a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 575b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch static int FunctionMapIndex(StrictMode strict_mode, FunctionKind kind) { 576b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch if (IsGeneratorFunction(kind)) { 577b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch return strict_mode == SLOPPY ? SLOPPY_GENERATOR_FUNCTION_MAP_INDEX 578b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch : STRICT_GENERATOR_FUNCTION_MAP_INDEX; 579b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 580b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 581b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch if (IsArrowFunction(kind) || IsConciseMethod(kind)) { 582b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch return strict_mode == SLOPPY 583b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch ? SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX 584b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch : STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX; 585b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 586b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 587b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch return strict_mode == SLOPPY ? SLOPPY_FUNCTION_MAP_INDEX 588b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch : STRICT_FUNCTION_MAP_INDEX; 589b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch } 590b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 591b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize; 592f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 593f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch // GC support. 594f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch typedef FixedBodyDescriptor< 595f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kHeaderSize, kSize, kSize> ScavengeBodyDescriptor; 596f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 597f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch typedef FixedBodyDescriptor< 598f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kHeaderSize, 599f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kHeaderSize + FIRST_WEAK_SLOT * kPointerSize, 600f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch kSize> MarkCompactBodyDescriptor; 601f87a203d89e1bbb6708282e0b64dbd13d59b723dBen Murdoch 602a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block private: 603a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Unchecked access to the slots. 604a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block Object* unchecked_previous() { return get(PREVIOUS_INDEX); } 605a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 606a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#ifdef DEBUG 607a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block // Bootstrapping-aware type checks. 608b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid); 609b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object); 610a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif 611b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch 612b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); 613b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); 614a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block}; 615a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 616a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block} } // namespace v8::internal 617a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block 618a7e24c173cf37484693b9abb38e494fa7bd7baebSteve Block#endif // V8_CONTEXTS_H_ 619