void serialize(OutputStream& stream,UserSection& userSection)
{
serializeConstant(stream,"expected user section (section ID 0)",(U8)SectionType::user);
ArrayOutputStream sectionStream;
serialize(sectionStream,userSection.name);
serializeBytes(sectionStream,userSection.data.data(),userSection.data.size());
std::vector<U8> sectionBytes = sectionStream.getBytes();
serialize(stream,sectionBytes);
}
void serializeSection(OutputStream& stream,SectionType type,SerializeSection serializeSectionBody)
{
serializeNativeValue(stream,type);
ArrayOutputStream sectionStream;
serializeSectionBody(sectionStream);
std::vector<U8> sectionBytes = sectionStream.getBytes();
Uptr sectionNumBytes = sectionBytes.size();
serializeVarUInt32(stream,sectionNumBytes);
serializeBytes(stream,sectionBytes.data(),sectionBytes.size());
}
bool resolve(const char* moduleName,const char* exportName,ObjectType type,Object*& outObject) override
{
// Try to resolve an intrinsic first.
if(IntrinsicResolver::singleton.resolve(moduleName,exportName,type,outObject)) { return true; }
// Then look for a named module.
auto namedResolverIt = moduleNameToResolverMap.find(moduleName);
if(namedResolverIt != moduleNameToResolverMap.end())
{
return namedResolverIt->second->resolve(moduleName,exportName,type,outObject);
}
// Finally, stub in missing function imports.
if(type.kind == ObjectKind::function)
{
// Generate a function body that just uses the unreachable op to fault if called.
ArrayOutputStream codeStream;
OperationEncoder encoder(codeStream);
encoder.unreachable();
encoder.end();
// Generate a module for the stub function.
Module stubModule;
DisassemblyNames stubModuleNames;
stubModule.code = codeStream.getBytes();
stubModule.types.push_back(type.function);
stubModule.functionDefs.push_back({{},0,{0,stubModule.code.size()}});
stubModule.exports.push_back({"importStub",ObjectKind::function,0});
stubModuleNames.functions.push_back(std::string(moduleName) + "." + exportName);
setDisassemblyNames(stubModule,stubModuleNames);
WebAssembly::validate(stubModule);
// Instantiate the module and return the stub function instance.
auto stubModuleInstance = instantiateModule(stubModule,{});
outObject = getInstanceExport(stubModuleInstance,"importStub");
Log::printf(Log::Category::error,"Generated stub for missing function import %s.%s : %s\n",moduleName,exportName,asString(type).c_str());
return true;
}
return false;
}