/*! * Copyright (c) 2017 by Contributors * \file system_lib_module.cc * \brief SystemLib module. */ #include <tvm/runtime/registry.h> #include <tvm/runtime/c_backend_api.h> #include <mutex> #include "module_util.h" namespace tvm { namespace runtime { class SystemLibModuleNode : public ModuleNode { public: SystemLibModuleNode() = default; const char* type_key() const final { return "system_lib"; } PackedFunc GetFunction( const std::string& name, const std::shared_ptr<ModuleNode>& sptr_to_self) final { std::lock_guard<std::mutex> lock(mutex_); if (module_blob_ != nullptr) { // If we previously recorded submodules, load them now. ImportModuleBlob(reinterpret_cast<const char*>(module_blob_), &imports_); module_blob_ = nullptr; } auto it = tbl_.find(name); if (it != tbl_.end()) { return WrapPackedFunc( reinterpret_cast<BackendPackedCFunc>(it->second), sptr_to_self); } else { return PackedFunc(); } } void RegisterSymbol(const std::string& name, void* ptr) { std::lock_guard<std::mutex> lock(mutex_); if (name == symbol::tvm_module_ctx) { void** ctx_addr = reinterpret_cast<void**>(ptr); *ctx_addr = this; } else if (name == symbol::tvm_dev_mblob) { // Record pointer to content of submodules to be loaded. // We defer loading submodules to the first call to GetFunction(). // The reason is that RegisterSymbol() gets called when initializing the // syslib (i.e. library loading time), and the registeries aren't ready // yet. Therefore, we might not have the functionality to load submodules // now. CHECK(module_blob_ == nullptr) << "Resetting mobule blob?"; module_blob_ = ptr; } else { auto it = tbl_.find(name); if (it != tbl_.end() && ptr != it->second) { LOG(WARNING) << "SystemLib symbol " << name << " get overriden to a different address " << ptr << "->" << it->second; } tbl_[name] = ptr; } } static const std::shared_ptr<SystemLibModuleNode>& Global() { static std::shared_ptr<SystemLibModuleNode> inst = std::make_shared<SystemLibModuleNode>(); return inst; } private: // Internal mutex std::mutex mutex_; // Internal symbol table std::unordered_map<std::string, void*> tbl_; // Module blob to be imported void* module_blob_{nullptr}; }; TVM_REGISTER_GLOBAL("module._GetSystemLib") .set_body([](TVMArgs args, TVMRetValue* rv) { *rv = runtime::Module(SystemLibModuleNode::Global()); }); } // namespace runtime } // namespace tvm int TVMBackendRegisterSystemLibSymbol(const char* name, void* ptr) { tvm::runtime::SystemLibModuleNode::Global()->RegisterSymbol(name, ptr); return 0; }