// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_CONTEXTS_INL_H_
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#define V8_CONTEXTS_INL_H_
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#include "src/contexts.h"
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#include "src/heap/heap.h"
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#include "src/objects-inl.h"
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#include "src/objects/dictionary.h"
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#include "src/objects/map-inl.h"
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#include "src/objects/regexp-match-info.h"
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#include "src/objects/scope-info.h"
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#include "src/objects/shared-function-info-inl.h"
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#include "src/objects/template-objects.h"
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namespace v8 {
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namespace internal {
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// static
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ScriptContextTable* ScriptContextTable::cast(Object* context) {
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DCHECK(context->IsScriptContextTable());
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return reinterpret_cast<ScriptContextTable*>(context);
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}
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int ScriptContextTable::used() const { return Smi::ToInt(get(kUsedSlotIndex)); }
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void ScriptContextTable::set_used(int used) {
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set(kUsedSlotIndex, Smi::FromInt(used));
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}
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// static
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Handle<Context> ScriptContextTable::GetContext(Isolate* isolate,
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Handle<ScriptContextTable> table,
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int i) {
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DCHECK(i < table->used());
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return Handle<Context>::cast(
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FixedArray::get(*table, i + kFirstContextSlotIndex, isolate));
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}
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// static
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Context* Context::cast(Object* context) {
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DCHECK(context->IsContext());
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return reinterpret_cast<Context*>(context);
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}
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NativeContext* NativeContext::cast(Object* context) {
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DCHECK(context->IsNativeContext());
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return reinterpret_cast<NativeContext*>(context);
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}
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void Context::set_scope_info(ScopeInfo* scope_info) {
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set(SCOPE_INFO_INDEX, scope_info);
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}
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Context* Context::previous() {
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Object* result = get(PREVIOUS_INDEX);
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DCHECK(IsBootstrappingOrValidParentContext(result, this));
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return reinterpret_cast<Context*>(result);
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}
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void Context::set_previous(Context* context) { set(PREVIOUS_INDEX, context); }
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Object* Context::next_context_link() { return get(Context::NEXT_CONTEXT_LINK); }
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bool Context::has_extension() { return !extension()->IsTheHole(); }
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HeapObject* Context::extension() {
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return HeapObject::cast(get(EXTENSION_INDEX));
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}
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void Context::set_extension(HeapObject* object) {
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set(EXTENSION_INDEX, object);
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}
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NativeContext* Context::native_context() const {
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Object* result = get(NATIVE_CONTEXT_INDEX);
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DCHECK(IsBootstrappingOrNativeContext(this->GetIsolate(), result));
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return reinterpret_cast<NativeContext*>(result);
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}
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void Context::set_native_context(NativeContext* context) {
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set(NATIVE_CONTEXT_INDEX, context);
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}
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bool Context::IsFunctionContext() const {
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return map()->instance_type() == FUNCTION_CONTEXT_TYPE;
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}
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bool Context::IsCatchContext() const {
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return map()->instance_type() == CATCH_CONTEXT_TYPE;
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}
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bool Context::IsWithContext() const {
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return map()->instance_type() == WITH_CONTEXT_TYPE;
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}
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bool Context::IsDebugEvaluateContext() const {
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return map()->instance_type() == DEBUG_EVALUATE_CONTEXT_TYPE;
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}
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bool Context::IsBlockContext() const {
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return map()->instance_type() == BLOCK_CONTEXT_TYPE;
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}
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bool Context::IsModuleContext() const {
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return map()->instance_type() == MODULE_CONTEXT_TYPE;
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}
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bool Context::IsEvalContext() const {
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return map()->instance_type() == EVAL_CONTEXT_TYPE;
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}
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bool Context::IsScriptContext() const {
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return map()->instance_type() == SCRIPT_CONTEXT_TYPE;
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}
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bool Context::HasSameSecurityTokenAs(Context* that) const {
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return this->native_context()->security_token() ==
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that->native_context()->security_token();
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}
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#define NATIVE_CONTEXT_FIELD_ACCESSORS(index, type, name) \
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void Context::set_##name(type* value) { \
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DCHECK(IsNativeContext()); \
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set(index, value); \
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} \
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bool Context::is_##name(type* value) const { \
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DCHECK(IsNativeContext()); \
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return type::cast(get(index)) == value; \
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} \
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type* Context::name() const { \
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DCHECK(IsNativeContext()); \
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return type::cast(get(index)); \
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}
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NATIVE_CONTEXT_FIELDS(NATIVE_CONTEXT_FIELD_ACCESSORS)
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#undef NATIVE_CONTEXT_FIELD_ACCESSORS
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#define CHECK_FOLLOWS2(v1, v2) STATIC_ASSERT((v1 + 1) == (v2))
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#define CHECK_FOLLOWS4(v1, v2, v3, v4) \
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CHECK_FOLLOWS2(v1, v2); \
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CHECK_FOLLOWS2(v2, v3); \
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CHECK_FOLLOWS2(v3, v4)
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int Context::FunctionMapIndex(LanguageMode language_mode, FunctionKind kind,
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bool has_prototype_slot, bool has_shared_name,
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bool needs_home_object) {
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if (IsClassConstructor(kind)) {
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// Like the strict function map, but with no 'name' accessor. 'name'
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// needs to be the last property and it is added during instantiation,
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// in case a static property with the same name exists"
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return CLASS_FUNCTION_MAP_INDEX;
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}
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int base = 0;
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if (IsGeneratorFunction(kind)) {
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CHECK_FOLLOWS4(GENERATOR_FUNCTION_MAP_INDEX,
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GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
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GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
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GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
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CHECK_FOLLOWS4(
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ASYNC_GENERATOR_FUNCTION_MAP_INDEX,
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ASYNC_GENERATOR_FUNCTION_WITH_NAME_MAP_INDEX,
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ASYNC_GENERATOR_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
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ASYNC_GENERATOR_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
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base = IsAsyncFunction(kind) ? ASYNC_GENERATOR_FUNCTION_MAP_INDEX
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: GENERATOR_FUNCTION_MAP_INDEX;
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} else if (IsAsyncFunction(kind)) {
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CHECK_FOLLOWS4(ASYNC_FUNCTION_MAP_INDEX, ASYNC_FUNCTION_WITH_NAME_MAP_INDEX,
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ASYNC_FUNCTION_WITH_HOME_OBJECT_MAP_INDEX,
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ASYNC_FUNCTION_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
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base = ASYNC_FUNCTION_MAP_INDEX;
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} else if (IsArrowFunction(kind) || IsConciseMethod(kind) ||
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IsAccessorFunction(kind)) {
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DCHECK_IMPLIES(IsArrowFunction(kind), !needs_home_object);
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CHECK_FOLLOWS4(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
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METHOD_WITH_NAME_MAP_INDEX,
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METHOD_WITH_HOME_OBJECT_MAP_INDEX,
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METHOD_WITH_NAME_AND_HOME_OBJECT_MAP_INDEX);
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base = STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX;
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} else {
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DCHECK(!needs_home_object);
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CHECK_FOLLOWS2(SLOPPY_FUNCTION_MAP_INDEX,
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SLOPPY_FUNCTION_WITH_NAME_MAP_INDEX);
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CHECK_FOLLOWS2(STRICT_FUNCTION_MAP_INDEX,
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STRICT_FUNCTION_WITH_NAME_MAP_INDEX);
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base = is_strict(language_mode) ? STRICT_FUNCTION_MAP_INDEX
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: SLOPPY_FUNCTION_MAP_INDEX;
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}
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int offset = static_cast<int>(!has_shared_name) |
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(static_cast<int>(needs_home_object) << 1);
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DCHECK_EQ(0, offset & ~3);
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return base + offset;
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}
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#undef CHECK_FOLLOWS2
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#undef CHECK_FOLLOWS4
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Map* Context::GetInitialJSArrayMap(ElementsKind kind) const {
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DCHECK(IsNativeContext());
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if (!IsFastElementsKind(kind)) return nullptr;
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DisallowHeapAllocation no_gc;
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Object* const initial_js_array_map = get(Context::ArrayMapIndex(kind));
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DCHECK(!initial_js_array_map->IsUndefined());
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return Map::cast(initial_js_array_map);
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}
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} // namespace internal
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} // namespace v8
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#endif // V8_CONTEXTS_INL_H_
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