Thanks for the reply.
But I'm curious about how you got this error message 'test.js:3: Invalid
asm.js: Unexpected token' via d8.
When I run these two snippets, I don't get any error message.
130|HWSEA-A:/data/local/tmp/v8/bin $ ./d8
V8 version 9.7.0 (candidate)
d8> function A() {"use asm"; function R() {} return R}
undefined
d8> function B() {"use asm"; function R() {}; return R}
undefined
d8>
在2023年11月21日星期二 UTC+8 18:41:06<Clemens Backes> 写道：
> The difference is that the first snippet is valid asm.js
> <http://asmjs.org/spec/latest/> while the second snippet is not.
>
> d8 prints a message if you try to instantiate the second function (via
> `A()`):
> test.js:3: Invalid asm.js: Unexpected token
>
> asm.js code is internally converted to Wasm and then run through the Wasm
> pipeline. There is a TODO in the code
> <https://source.chromium.org/chromium/chromium/src/+/main:v8/src/snapshot/code-serializer.cc;l=69;drc=46087cf6fe634dcd189cc01bcafef39cc0dad4df>
>
> to enable serialization of asm.js modules, but this has not been worked on
> in the last years. If this is something you need, feel free to open a bug
> <https://crbug.com/v8/new> and describe your use case.
>
> -Clemens
>
> On Tue, Nov 21, 2023 at 3:55 AM haochen shi <kevinsh...@gmail.com> wrote:
>
>> I try to create a codeCache via V8.
>>
>> ```
>> ScriptCompiler::CachedData* CreateCachedData(Local<String> sourceContent,
>> Local<String> sourceName) {
>> ScriptOrigin* scriptOriginPtr = nullptr;
>> scriptOriginPtr = new ScriptOrigin(
>> String::NewFromTwoByte(isolate_, sourceName,
>> NewStringType::kNormal).ToLocalChecked(),
>> Integer::New(isolate_, 0), Integer::New(isolate_, 0));
>> ScriptCompiler::Source* source = nullptr;
>> source = new ScriptCompiler::Source(sourceContent, *scriptOriginPtr);
>>
>> Local<Script> script;
>> ScriptCompiler::Compile(context_, source,
>> ScriptCompiler::CompileOptions::kEagerCompile).ToLocal(&script);
>>
>> ScriptCompiler::CachedData* data =
>> ScriptCompiler::CreateCodeCache(script->GetUnboundScript());
>>
>> return data;
>> }
>> ```
>>
>> When I use these code, the value of data is nullptr.
>>
>> ```
>> function A() {
>> "use asm"
>> function R() {}
>> return R
>> }
>> ```
>>
>> When I use these code, the value of data isn't nullptr.
>>
>> ```
>> function A() {
>> "use asm"
>> function R() {};
>> return R
>> }
>> ```
>>
>> What's the difference between these two JS codes? In V8? And In JS?
>>
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>>
>
>
> --
>
> Clemens Backes
>
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>
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