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src: Use V8 function to get Module Namespace #16261

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src: Use V8 function to get Module Namespace
bmeck Oct 17, 2017
41cdcab
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bmeck Oct 17, 2017
3256d23
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bmeck Oct 19, 2017
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3 changes: 1 addition & 2 deletions lib/internal/loader/Loader.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@
const { getURLFromFilePath } = require('internal/url');

const {
getNamespaceOfModuleWrap,
createDynamicModule
} = require('internal/loader/ModuleWrap');
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@bnoordhuis bnoordhuis Oct 17, 2017

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You could fit this on one line now.

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@bmeck bmeck Oct 17, 2017

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done


Expand Down Expand Up @@ -99,7 +98,7 @@ class Loader {
async import(specifier, parentURL = this.base) {
const job = await this.getModuleJob(specifier, parentURL);
const module = await job.run();
return getNamespaceOfModuleWrap(module);
return module.namespace();
}
}
Object.setPrototypeOf(Loader.prototype, null);
Expand Down
8 changes: 0 additions & 8 deletions lib/internal/loader/ModuleWrap.js
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Expand Up @@ -6,13 +6,6 @@ const debug = require('util').debuglog('esm');
const ArrayJoin = Function.call.bind(Array.prototype.join);
const ArrayMap = Function.call.bind(Array.prototype.map);

const getNamespaceOfModuleWrap = (m) => {
const tmp = new ModuleWrap('import * as _ from "";_;', '');
tmp.link(async () => m);
tmp.instantiate();
return tmp.evaluate();
};

const createDynamicModule = (exports, url = '', evaluate) => {
debug(
`creating ESM facade for ${url} with exports: ${ArrayJoin(exports, ', ')}`
Expand Down Expand Up @@ -57,6 +50,5 @@ const createDynamicModule = (exports, url = '', evaluate) => {

module.exports = {
createDynamicModule,
getNamespaceOfModuleWrap,
ModuleWrap
};
9 changes: 9 additions & 0 deletions src/module_wrap.cc
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Expand Up @@ -207,6 +207,14 @@ void ModuleWrap::Evaluate(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(ret);
}

void ModuleWrap::Namespace(const FunctionCallbackInfo<Value>& args) {
auto iso = args.GetIsolate();
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@addaleax addaleax Oct 17, 2017

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style nit: isolate

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@bmeck bmeck Oct 17, 2017

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done

auto that = args.This();
ModuleWrap* obj = Unwrap<ModuleWrap>(that);
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@addaleax addaleax Oct 17, 2017

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Can you CHECK_NE(obj, nullptr);?

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@bmeck bmeck Oct 17, 2017

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done

auto result = obj->module_.Get(iso)->GetModuleNamespace();
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@bnoordhuis bnoordhuis Oct 17, 2017

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GetModuleNamespace() terminates with a fatal error when GetStatus() isn't one of kInstantiated, kEvaluating or kEvaluated.

I believe I understand how the previous code enforced that invariant (by calling .instantiate() and .evaluate(), right?) but what ensures that now?

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@bmeck bmeck Oct 17, 2017

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nothing except when it is called, can add a check and throw though.

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@bmeck bmeck Oct 17, 2017

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made it throw after checking status

args.GetReturnValue().Set(result);
}

MaybeLocal<Module> ModuleWrap::ResolveCallback(Local<Context> context,
Local<String> specifier,
Local<Module> referrer) {
Expand Down Expand Up @@ -516,6 +524,7 @@ void ModuleWrap::Initialize(Local<Object> target,
env->SetProtoMethod(tpl, "link", Link);
env->SetProtoMethod(tpl, "instantiate", Instantiate);
env->SetProtoMethod(tpl, "evaluate", Evaluate);
env->SetProtoMethod(tpl, "namespace", Namespace);
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@addaleax addaleax Oct 17, 2017

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getNamespace & GetNamespace? At least if this is idempotent I think that’d be a better name

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@bmeck bmeck Oct 17, 2017

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it can throw if it isn't instantiated.


target->Set(FIXED_ONE_BYTE_STRING(isolate, "ModuleWrap"), tpl->GetFunction());
env->SetMethod(target, "resolve", node::loader::ModuleWrap::Resolve);
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1 change: 1 addition & 0 deletions src/module_wrap.h
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Expand Up @@ -34,6 +34,7 @@ class ModuleWrap : public BaseObject {
static void Link(const v8::FunctionCallbackInfo<v8::Value>& args);
static void Instantiate(const v8::FunctionCallbackInfo<v8::Value>& args);
static void Evaluate(const v8::FunctionCallbackInfo<v8::Value>& args);
static void Namespace(const v8::FunctionCallbackInfo<v8::Value>& args);
static void GetUrl(v8::Local<v8::String> property,
const v8::PropertyCallbackInfo<v8::Value>& info);
static void Resolve(const v8::FunctionCallbackInfo<v8::Value>& args);
Expand Down
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