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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) {
uint32_t hash = shared_info->Hash();
// Check the template weakmap to see if the template object already exists.
Handle<EphemeronHashTable> template_weakmap;
if (native_context->template_weakmap().IsUndefined(isolate)) {
template_weakmap = EphemeronHashTable::New(isolate, 1);
} else {
DisallowGarbageCollection no_gc;
ReadOnlyRoots roots(isolate);
template_weakmap = handle(
EphemeronHashTable::cast(native_context->template_weakmap()), isolate);
Object maybe_cached_template = template_weakmap->Lookup(shared_info, hash);
while (!maybe_cached_template.IsTheHole(roots)) {
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<FixedArray> cooked_strings(description->cooked_strings(), isolate);
Handle<JSArray> template_object =
isolate->factory()->NewJSArrayForTemplateLiteralArray(cooked_strings,
raw_strings);
// 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());
Handle<CachedTemplateObject> result_handle =
Handle<CachedTemplateObject>::cast(isolate->factory()->NewStruct(
CACHED_TEMPLATE_OBJECT_TYPE, AllocationType::kOld));
{
DisallowGarbageCollection no_gc;
auto result = *result_handle;
result.set_slot_id(slot_id);
result.set_template_object(*template_object);
result.set_next(*next);
}
return result_handle;
}
} // namespace internal
} // namespace v8
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