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// Copyright 2017 The Chromium 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 "third_party/blink/renderer/core/script/module_record_resolver_impl.h"
#include "third_party/blink/renderer/bindings/core/v8/module_record.h"
#include "third_party/blink/renderer/core/loader/modulescript/module_script_creation_params.h"
#include "third_party/blink/renderer/core/script/modulator.h"
#include "third_party/blink/renderer/core/script/module_script.h"
namespace blink {
void ModuleRecordResolverImpl::RegisterModuleScript(
const ModuleScript* module_script) {
DCHECK(module_script);
v8::Local<v8::Module> module = module_script->V8Module();
if (module.IsEmpty())
return;
v8::Isolate* isolate = modulator_->GetScriptState()->GetIsolate();
BoxedV8Module* record = MakeGarbageCollected<BoxedV8Module>(isolate, module);
DVLOG(1) << "ModuleRecordResolverImpl::RegisterModuleScript(url="
<< module_script->BaseURL().GetString()
<< ", hash=" << BoxedV8ModuleHash::GetHash(record) << ")";
auto result = record_to_module_script_map_.Set(record, module_script);
DCHECK(result.is_new_entry);
}
void ModuleRecordResolverImpl::UnregisterModuleScript(
const ModuleScript* module_script) {
DCHECK(module_script);
v8::Local<v8::Module> module = module_script->V8Module();
if (module.IsEmpty())
return;
v8::Isolate* isolate = modulator_->GetScriptState()->GetIsolate();
BoxedV8Module* record = MakeGarbageCollected<BoxedV8Module>(isolate, module);
DVLOG(1) << "ModuleRecordResolverImpl::UnregisterModuleScript(url="
<< module_script->BaseURL().GetString()
<< ", hash=" << BoxedV8ModuleHash::GetHash(record) << ")";
record_to_module_script_map_.erase(record);
}
const ModuleScript* ModuleRecordResolverImpl::GetModuleScriptFromModuleRecord(
v8::Local<v8::Module> module) const {
v8::Isolate* isolate = modulator_->GetScriptState()->GetIsolate();
const auto it = record_to_module_script_map_.find(
MakeGarbageCollected<BoxedV8Module>(isolate, module));
CHECK_NE(it, record_to_module_script_map_.end())
<< "Failed to find ModuleScript corresponding to the "
"record.[[HostDefined]]";
CHECK(it->value);
return it->value;
}
// <specdef
// href="https://html.spec.whatwg.org/C/#hostresolveimportedmodule(referencingscriptormodule,-specifier)">
v8::Local<v8::Module> ModuleRecordResolverImpl::Resolve(
const ModuleRequest& module_request,
v8::Local<v8::Module> referrer,
ExceptionState& exception_state) {
v8::Isolate* isolate = modulator_->GetScriptState()->GetIsolate();
DVLOG(1) << "ModuleRecordResolverImpl::resolve(specifier=\""
<< module_request.specifier << ", referrer.hash="
<< BoxedV8ModuleHash::GetHash(
MakeGarbageCollected<BoxedV8Module>(isolate, referrer))
<< ")";
// <spec step="3">If referencingScriptOrModule is not null, then:</spec>
//
// Currently this function implements the spec before
// https://github.com/tc39/proposal-dynamic-import is applied, i.e. where
// |referencingScriptOrModule| was always a non-null module script.
// <spec step="3.2">Set settings object to referencing script's settings
// object.</spec>
//
// <spec step="4">Let moduleMap be settings object's module map.</spec>
//
// These are |modulator_| and |this|, respectively, because module script's
// settings object is always the current settings object in Blink.
// <spec step="3.1">Let referencing script be
// referencingScriptOrModule.[[HostDefined]].</spec>
const ModuleScript* referrer_module =
GetModuleScriptFromModuleRecord(referrer);
// <spec step="3.3">Set base URL to referencing script's base URL.</spec>
// <spec step="5">Let url be the result of resolving a module specifier given
// base URL and specifier.</spec>
KURL url = referrer_module->ResolveModuleSpecifier(module_request.specifier);
ModuleType child_module_type =
modulator_->ModuleTypeFromRequest(module_request);
// <spec step="6">Assert: url is never failure, because resolving a module
// specifier must have been previously successful with these same two
// arguments ...</spec>
DCHECK(url.IsValid());
CHECK_NE(child_module_type, ModuleType::kInvalid);
// <spec step="7">Let resolved module script be moduleMap[url]. (This entry
// must exist for us to have gotten to this point.)</spec>
ModuleScript* module_script =
modulator_->GetFetchedModuleScript(url, child_module_type);
// <spec step="8">Assert: resolved module script is a module script (i.e., is
// not null or "fetching").</spec>
//
// <spec step="9">Assert: resolved module script's record is not null.</spec>
DCHECK(module_script);
v8::Local<v8::Module> record = module_script->V8Module();
CHECK(!record.IsEmpty());
// <spec step="10">Return resolved module script's record.</spec>
return record;
}
void ModuleRecordResolverImpl::ContextDestroyed() {
// crbug.com/725816 : What we should really do is to make the map key
// weak reference to v8::Module.
record_to_module_script_map_.clear();
}
void ModuleRecordResolverImpl::Trace(Visitor* visitor) const {
ModuleRecordResolver::Trace(visitor);
ExecutionContextLifecycleObserver::Trace(visitor);
visitor->Trace(record_to_module_script_map_);
visitor->Trace(modulator_);
}
} // namespace blink
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