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// Copyright 2017 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.
#include "src/objects/template-objects.h"
#include "src/base/functional.h"
#include "src/execution/isolate.h"
#include "src/heap/factory.h"
#include "src/objects/objects-inl.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/template-objects-inl.h"
namespace v8 {
namespace internal {
// static
Handle<JSArray> TemplateObjectDescription::GetTemplateObject(
Isolate* isolate, Handle<NativeContext> native_context,
Handle<TemplateObjectDescription> description,
Handle<SharedFunctionInfo> shared_info, int slot_id) {
// Check the template weakmap to see if the template object already exists.
Handle<EphemeronHashTable> template_weakmap =
native_context->template_weakmap().IsUndefined(isolate)
? EphemeronHashTable::New(isolate, 0)
: handle(EphemeronHashTable::cast(native_context->template_weakmap()),
isolate);
uint32_t hash = shared_info->Hash();
Object maybe_cached_template = template_weakmap->Lookup(shared_info, hash);
while (!maybe_cached_template.IsTheHole()) {
CachedTemplateObject cached_template =
CachedTemplateObject::cast(maybe_cached_template);
if (cached_template.slot_id() == slot_id)
return handle(cached_template.template_object(), isolate);
maybe_cached_template = cached_template.next();
}
// Create the raw object from the {raw_strings}.
Handle<FixedArray> raw_strings(description->raw_strings(), isolate);
Handle<JSArray> raw_object = isolate->factory()->NewJSArrayWithElements(
raw_strings, PACKED_ELEMENTS, raw_strings->length(),
AllocationType::kOld);
// Create the template object from the {cooked_strings}.
Handle<FixedArray> cooked_strings(description->cooked_strings(), isolate);
Handle<JSArray> template_object = isolate->factory()->NewJSArrayWithElements(
cooked_strings, PACKED_ELEMENTS, cooked_strings->length(),
AllocationType::kOld);
// Freeze the {raw_object}.
JSObject::SetIntegrityLevel(raw_object, FROZEN, kThrowOnError).ToChecked();
// Install a "raw" data property for {raw_object} on {template_object}.
PropertyDescriptor raw_desc;
raw_desc.set_value(raw_object);
raw_desc.set_configurable(false);
raw_desc.set_enumerable(false);
raw_desc.set_writable(false);
JSArray::DefineOwnProperty(isolate, template_object,
isolate->factory()->raw_string(), &raw_desc,
Just(kThrowOnError))
.ToChecked();
// Freeze the {template_object} as well.
JSObject::SetIntegrityLevel(template_object, FROZEN, kThrowOnError)
.ToChecked();
// Insert the template object into the template weakmap.
Handle<HeapObject> previous_cached_templates = handle(
HeapObject::cast(template_weakmap->Lookup(shared_info, hash)), isolate);
Handle<CachedTemplateObject> cached_template = CachedTemplateObject::New(
isolate, slot_id, template_object, previous_cached_templates);
template_weakmap = EphemeronHashTable::Put(
isolate, template_weakmap, shared_info, cached_template, hash);
native_context->set_template_weakmap(*template_weakmap);
return template_object;
}
Handle<CachedTemplateObject> CachedTemplateObject::New(
Isolate* isolate, int slot_id, Handle<JSArray> template_object,
Handle<HeapObject> next) {
DCHECK(next->IsCachedTemplateObject() || next->IsTheHole());
Factory* factory = isolate->factory();
Handle<CachedTemplateObject> result = Handle<CachedTemplateObject>::cast(
factory->NewStruct(TUPLE3_TYPE, AllocationType::kOld));
result->set_slot_id(slot_id);
result->set_template_object(*template_object);
result->set_next(*next);
return result;
}
} // namespace internal
} // namespace v8