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  1. //===----- COFFVCRuntimeSupport.h -- VC runtime support in ORC --*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. // Utilities for loading and initializaing vc runtime in Orc.
  10. //
  11. //===----------------------------------------------------------------------===//
  12.  
  13. #ifndef LLVM_EXECUTIONENGINE_ORC_COFFCRUNTIMESUPPORT_H
  14. #define LLVM_EXECUTIONENGINE_ORC_COFFCRUNTIMESUPPORT_H
  15.  
  16. #include "llvm/ADT/StringRef.h"
  17. #include "llvm/ExecutionEngine/Orc/Core.h"
  18. #include "llvm/ExecutionEngine/Orc/ExecutorProcessControl.h"
  19. #include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
  20. #include "llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h"
  21.  
  22. #include <future>
  23. #include <memory>
  24. #include <thread>
  25. #include <vector>
  26.  
  27. namespace llvm {
  28. namespace orc {
  29.  
  30. /// Bootstraps the vc runtime within jitdylibs.
  31. class COFFVCRuntimeBootstrapper {
  32. public:
  33.   /// Try to create a COFFVCRuntimeBootstrapper instance. An optional
  34.   /// RuntimePath can be given to specify the location of directory that
  35.   /// contains all vc runtime library files such as ucrt.lib and msvcrt.lib. If
  36.   /// not path was given, it will try to search the MSVC toolchain and Windows
  37.   /// SDK installation and use the found library files automatically.
  38.   ///
  39.   /// Note that depending on the build setting, a different library
  40.   /// file must be used. In general, if vc runtime was statically linked to the
  41.   /// object file that is to be jit-linked, LoadStaticVCRuntime and
  42.   /// InitializeStaticVCRuntime must be used with libcmt.lib, libucrt.lib,
  43.   /// libvcruntimelib. If vc runtime was dynamically linked LoadDynamicVCRuntime
  44.   /// must be used along with msvcrt.lib, ucrt.lib, vcruntime.lib.
  45.   ///
  46.   /// More information is on:
  47.   /// https://docs.microsoft.com/en-us/cpp/c-runtime-library/crt-library-features
  48.   static Expected<std::unique_ptr<COFFVCRuntimeBootstrapper>>
  49.   Create(ExecutionSession &ES, ObjectLinkingLayer &ObjLinkingLayer,
  50.          const char *RuntimePath = nullptr);
  51.  
  52.   /// Adds symbol definitions of static version of msvc runtime libraries.
  53.   Expected<std::vector<std::string>>
  54.   loadStaticVCRuntime(JITDylib &JD, bool DebugVersion = false);
  55.  
  56.   /// Runs the initializer of static version of msvc runtime libraries.
  57.   /// This must be called before calling any functions requiring c runtime (e.g.
  58.   /// printf) within the jit session. Note that proper initialization of vc
  59.   /// runtime requires ability of running static initializers. Cosider setting
  60.   /// up COFFPlatform.
  61.   Error initializeStaticVCRuntime(JITDylib &JD);
  62.  
  63.   /// Adds symbol definitions of dynamic versino of msvc runtie libraries.
  64.   Expected<std::vector<std::string>>
  65.   loadDynamicVCRuntime(JITDylib &JD, bool DebugVersion = false);
  66.  
  67. private:
  68.   COFFVCRuntimeBootstrapper(ExecutionSession &ES,
  69.                             ObjectLinkingLayer &ObjLinkingLayer,
  70.                             const char *RuntimePath);
  71.  
  72.   ExecutionSession &ES;
  73.   ObjectLinkingLayer &ObjLinkingLayer;
  74.   std::string RuntimePath;
  75.  
  76.   struct MSVCToolchainPath {
  77.     SmallString<256> VCToolchainLib;
  78.     SmallString<256> UCRTSdkLib;
  79.   };
  80.  
  81.   static Expected<MSVCToolchainPath> getMSVCToolchainPath();
  82.   Error loadVCRuntime(JITDylib &JD, std::vector<std::string> &ImportedLibraries,
  83.                       ArrayRef<StringRef> VCLibs, ArrayRef<StringRef> UCRTLibs);
  84. };
  85.  
  86. } // namespace orc
  87. } // namespace llvm
  88.  
  89. #endif
  90.