Qfyilyi

I use Google V8 as shared library in simple application under Windows. Right now, the application just compile JavaScript without execution. Vld shows the memory leaks into v8.dll. These leaks have call stack like these:

c:program files (x86)microsoft visual studio 14.0vcincludexmemory0 (977): v8.dll!std::_Wrap_alloc<std::allocator<std::_Container_proxy> >::allocate()

c:program files (x86)microsoft visual studio 14.0vcincludevector (580): v8.dll!std::_Vector_alloc<std::_Vec_base_types<unsigned char,std::allocator<unsigned char> > >::_Alloc_proxy() + 0xF bytes

c:program files (x86)microsoft visual studio 14.0vcincludevector (545): v8.dll!std::_Vector_alloc<std::_Vec_base_types<unsigned char,std::allocator<unsigned char> > >::_Vector_alloc<std::_Vec_base_types<unsigned char,std::allocator<unsigned char> > >() + 0xA bytes

c:program files (x86)microsoft visual studio 14.0vcincludevector (706): v8.dll!std::vector<unsigned char,std::allocator<unsigned char> >::vector<unsigned char,std::allocator<unsigned char> >() + 0xA bytes

c:workv84.1.0.3v8srctype-feedback-vector.h (21): v8.dll!v8::internal::FeedbackVectorSpec::FeedbackVectorSpec() + 0x31 bytes

c:workv84.1.0.3v8srcast.h (175): v8.dll!v8::internal::AstProperties::AstProperties() + 0x33 bytes

c:workv84.1.0.3v8srcast.h (2607): v8.dll!v8::internal::FunctionLiteral::FunctionLiteral() + 0x22 bytes

c:workv84.1.0.3v8srcast.h (3515): v8.dll!v8::internal::AstNodeFactory::NewFunctionLiteral() + 0xDC bytes

c:workv84.1.0.3v8srcparser.cc (3814): v8.dll!v8::internal::Parser::ParseFunctionLiteral() + 0xBD bytes

c:workv84.1.0.3v8srcparser.cc (1060): v8.dll!v8::internal::Parser::ParseLazy() + 0x71 bytes

c:workv84.1.0.3v8srcparser.cc (1000): v8.dll!v8::internal::Parser::ParseLazy() + 0x15 bytes

c:workv84.1.0.3v8srcparser.cc (5125): v8.dll!v8::internal::Parser::Parse() + 0xA bytes

c:workv84.1.0.3v8srcparser.h (673): v8.dll!v8::internal::Parser::Parse() + 0xA bytes

c:workv84.1.0.3v8srccompiler.cc (687): v8.dll!v8::internal::GetUnoptimizedCodeCommon() + 0xF bytes

c:workv84.1.0.3v8srccompiler.cc (966): v8.dll!v8::internal::Compiler::GetLazyCode() + 0x15 bytes

c:workv84.1.0.3v8srcruntimeruntime-compiler.cc (36): v8.dll!v8::internal::__RT_impl_Runtime_CompileLazy() + 0xF bytes

c:workv84.1.0.3v8srcruntimeruntime-compiler.cc (20): v8.dll!v8::internal::Runtime_CompileLazy() + 0x72 bytes



...



c:program files (x86)microsoft visual studio 14.0vcincludexmemory0 (977): v8.dll!std::_Wrap_alloc<std::allocator<std::_Container_proxy> >::allocate()

c:program files (x86)microsoft visual studio 14.0vcincludevector (580): v8.dll!std::_Vector_alloc<std::_Vec_base_types<unsigned char,std::allocator<unsigned char> > >::_Alloc_proxy() + 0xF bytes

c:program files (x86)microsoft visual studio 14.0vcincludevector (545): v8.dll!std::_Vector_alloc<std::_Vec_base_types<unsigned char,std::allocator<unsigned char> > >::_Vector_alloc<std::_Vec_base_types<unsigned char,std::allocator<unsigned char> > >() + 0xA bytes

c:program files (x86)microsoft visual studio 14.0vcincludevector (706): v8.dll!std::vector<unsigned char,std::allocator<unsigned char> >::vector<unsigned char,std::allocator<unsigned char> >() + 0xA bytes

c:workv84.1.0.3v8srctype-feedback-vector.h (21): v8.dll!v8::internal::FeedbackVectorSpec::FeedbackVectorSpec() + 0x31 bytes

c:workv84.1.0.3v8srcast.h (175): v8.dll!v8::internal::AstProperties::AstProperties() + 0x33 bytes

c:workv84.1.0.3v8srcast.h (2607): v8.dll!v8::internal::FunctionLiteral::FunctionLiteral() + 0x22 bytes

c:workv84.1.0.3v8srcast.h (3515): v8.dll!v8::internal::AstNodeFactory::NewFunctionLiteral() + 0xDC bytes

c:workv84.1.0.3v8srcparser.cc (957): v8.dll!v8::internal::Parser::DoParseProgram() + 0x10B bytes

c:workv84.1.0.3v8srcparser.cc (861): v8.dll!v8::internal::Parser::ParseProgram() + 0x27 bytes

c:workv84.1.0.3v8srcparser.cc (5131): v8.dll!v8::internal::Parser::Parse() + 0xA bytes

c:workv84.1.0.3v8srcparser.h (673): v8.dll!v8::internal::Parser::Parse() + 0xA bytes

c:workv84.1.0.3v8srccompiler.cc (1148): v8.dll!v8::internal::CompileToplevel() + 0x12 bytes

c:workv84.1.0.3v8srccompiler.cc (1338): v8.dll!v8::internal::Compiler::CompileScript() + 0x15 bytes

c:workv84.1.0.3v8srcbootstrapper.cc (1448): v8.dll!v8::internal::Genesis::CompileScriptCached() + 0x9E bytes

c:workv84.1.0.3v8srcbootstrapper.cc (1418): v8.dll!v8::internal::Genesis::CompileNative() + 0x64 bytes

c:workv84.1.0.3v8srcbootstrapper.cc (1404): v8.dll!v8::internal::Genesis::CompileExperimentalBuiltin()

c:workv84.1.0.3v8srcbootstrapper.cc (2198): v8.dll!v8::internal::Genesis::InstallExperimentalNatives() + 0x19B bytes

c:workv84.1.0.3v8srcbootstrapper.cc (2766): v8.dll!v8::internal::Genesis::Genesis() + 0xD bytes

c:workv84.1.0.3v8srcbootstrapper.cc (351): v8.dll!v8::internal::Bootstrapper::CreateEnvironment() + 0x32 bytes

c:workv84.1.0.3v8srcapi.cc (5229): v8.dll!v8::CreateEnvironment() + 0x34 bytes

c:workv84.1.0.3v8srcapi.cc (5260): v8.dll!v8::Context::New()

May be someone met the same issue before and can help me to find root of these memory leaks into v8 dll to fix it.

Version 3.31.26 of the V8 doesn't have memory leaks like these.

My application is very simple, first of all init v8:

v8::V8::InitializeICU();

auto platform = platform_ptr(v8::platform::CreateDefaultPlatform());

v8::V8::InitializePlatform(platform.get());

v8::V8::Initialize();

create isolate:

isolate_ = v8::Isolate::New();

v8::HandleScope handle_scope(isolate_);

global_template_ = std::make_unique<js_compilation::global_template_wrapper>(isolate_);

compiling js code:

void js_compilation::compile(const std::string &js_script)

{

    v8::Locker locker(isolate_);

    v8::Isolate::Scope scope(isolate_);



    //Create a stack allocated handle scope

    v8::HandleScope handle_scope(isolate_);

    v8::TryCatch try_catch(isolate_);



    //Create the global template

    v8::Local<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New(isolate_);



    //Create a context

    v8::Local<v8::Context> context = v8::Context::New(isolate_, NULL, global_template);



    //Set the context scope

    v8::Context::Scope context_scope(context);

    v8::Local<v8::Object> global = context->Global();

    v8::Local<v8::String> source = v8::String::NewFromUtf8(isolate_, js_script.c_str());



    //Compile

    auto script = v8::Script::Compile(source);

    if (script.IsEmpty())

    {

        throw std::runtime_error(get_error_string("Compile error: ", isolate_, try_catch));

    }

    script->Run();



    compiled_script_.Reset(isolate_, script->GetUnboundScript());

}

After compiling:

compiled_script_.Reset();

isolate_->Dispose();



v8::V8::Dispose();

v8::V8::ShutdownPlatform();

Compiling script is:

const std::string jsScript = "function test_function() {n" 

    "   var match = 0;n" 

    "   if (arguments[0] == arguments[1]) {n" 

    "       match = 1;n" 

    "   }n" 

    "   return match;n" 

    "}nn"



    "function JSrepeat(name, repeat) {n" 

    "   var printthis = "";n" 

    "   for (var i = 0; i < repeat; i++) {n" 

    "       printthis += name;n" 

    "   }n" 

    "   return printthis;n" 

    "}nn" 



    "function ReturnThis(anything) {n"

    "   return anything;n" 

    "}nn"



    "function $13625432() {n"

    "   return "Jimmy";n"

    "}n";

V8 developer here. Version 4.1.0.3 is ancient and was never considered particularly stable (.3 is right after a branch point, not the end of a stable branch, so it's almost like any random daily snapshot). If you can reproduce these issues with version 7.0.276.40 (or later) I'd be interested to take a closer look, but versions 4.x are just not worth anyone's time at this point, sorry.