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