1 | /* |
---|---|
2 | * Licensed to the Apache Software Foundation (ASF) under one |
3 | * or more contributor license agreements. See the NOTICE file |
4 | * distributed with this work for additional information |
5 | * regarding copyright ownership. The ASF licenses this file |
6 | * to you under the Apache License, Version 2.0 (the |
7 | * "License"); you may not use this file except in compliance |
8 | * with the License. You may obtain a copy of the License at |
9 | * |
10 | * http://www.apache.org/licenses/LICENSE-2.0 |
11 | * |
12 | * Unless required by applicable law or agreed to in writing, |
13 | * software distributed under the License is distributed on an |
14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
15 | * KIND, either express or implied. See the License for the |
16 | * specific language governing permissions and limitations |
17 | * under the License. |
18 | */ |
19 | |
20 | /*! |
21 | * \file system_library.cc |
22 | * \brief Create library module that directly get symbol from the system lib. |
23 | */ |
24 | #include <tvm/runtime/c_backend_api.h> |
25 | #include <tvm/runtime/memory.h> |
26 | #include <tvm/runtime/registry.h> |
27 | |
28 | #include <mutex> |
29 | |
30 | #include "library_module.h" |
31 | |
32 | namespace tvm { |
33 | namespace runtime { |
34 | |
35 | class SystemLibrary : public Library { |
36 | public: |
37 | SystemLibrary() = default; |
38 | |
39 | void* GetSymbol(const char* name) final { |
40 | std::lock_guard<std::mutex> lock(mutex_); |
41 | auto it = tbl_.find(name); |
42 | if (it != tbl_.end()) { |
43 | return it->second; |
44 | } else { |
45 | return nullptr; |
46 | } |
47 | } |
48 | |
49 | void RegisterSymbol(const std::string& name, void* ptr) { |
50 | std::lock_guard<std::mutex> lock(mutex_); |
51 | auto it = tbl_.find(name); |
52 | if (it != tbl_.end() && ptr != it->second) { |
53 | LOG(WARNING) << "SystemLib symbol "<< name << " get overriden to a different address "<< ptr |
54 | << "->"<< it->second; |
55 | } |
56 | tbl_[name] = ptr; |
57 | } |
58 | |
59 | static const ObjectPtr<SystemLibrary>& Global() { |
60 | static auto inst = make_object<SystemLibrary>(); |
61 | return inst; |
62 | } |
63 | |
64 | private: |
65 | // Internal mutex |
66 | std::mutex mutex_; |
67 | // Internal symbol table |
68 | std::unordered_map<std::string, void*> tbl_; |
69 | }; |
70 | |
71 | TVM_REGISTER_GLOBAL("runtime.SystemLib").set_body_typed([]() { |
72 | static auto mod = CreateModuleFromLibrary(SystemLibrary::Global()); |
73 | return mod; |
74 | }); |
75 | } // namespace runtime |
76 | } // namespace tvm |
77 | |
78 | int TVMBackendRegisterSystemLibSymbol(const char* name, void* ptr) { |
79 | tvm::runtime::SystemLibrary::Global()->RegisterSymbol(name, ptr); |
80 | return 0; |
81 | } |
82 |