llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.h

   1 //===-- RuntimeDyldCOFF.h - Run-time dynamic linker for MC-JIT ---*- 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 // COFF support for MC-JIT runtime dynamic linker.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_RUNTIME_DYLD_COFF_H
  14 #define LLVM_RUNTIME_DYLD_COFF_H
  15
  16 #include "RuntimeDyldImpl.h"
  17 #include "llvm/Support/MathExtras.h"
  18
  19 namespace llvm {
  20
  21 // Common base class for COFF dynamic linker support.
  22 // Concrete subclasses for each target can be found in ./Targets.
  23 class RuntimeDyldCOFF : public RuntimeDyldImpl {
  24
  25 public:
  26   std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
  27   loadObject(const object::ObjectFile &Obj) override;
  28   bool isCompatibleFile(const object::ObjectFile &Obj) const override;
  29
  30   static std::unique_ptr<RuntimeDyldCOFF>
  31   create(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MemMgr,
  32          JITSymbolResolver &Resolver);
  33
  34 protected:
  35   RuntimeDyldCOFF(RuntimeDyld::MemoryManager &MemMgr,
  36                   JITSymbolResolver &Resolver, unsigned PointerSize,
  37                   uint32_t PointerReloc)
  38       : RuntimeDyldImpl(MemMgr, Resolver), PointerSize(PointerSize),
  39         PointerReloc(PointerReloc) {
  40     assert((PointerSize == 4 || PointerSize == 8) && "Unexpected pointer size");
  41   }
  42
  43   uint64_t getSymbolOffset(const SymbolRef &Sym);
  44   uint64_t getDLLImportOffset(unsigned SectionID, StubMap &Stubs,
  45                               StringRef Name, bool SetSectionIDMinus1 = false);
  46
  47   static constexpr StringRef getImportSymbolPrefix() { return "__imp_"; }
  48
  49   bool relocationNeedsDLLImportStub(const RelocationRef &R) const override;
  50
  51   unsigned sizeAfterAddingDLLImportStub(unsigned Size) const override {
  52     return alignTo(Size, PointerSize) + PointerSize;
  53   }
  54
  55 private:
  56   unsigned PointerSize;
  57   uint32_t PointerReloc;
  58 };
  59
  60 } // end namespace llvm
  61
  62 #endif // LLVM_RUNTIME_DYLD_COFF_H