1 //===-- RuntimeDyldCOFF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-==//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Implementation of COFF support for the MC-JIT runtime dynamic linker.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "RuntimeDyldCOFF.h"
15 #include "Targets/RuntimeDyldCOFFX86_64.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Object/ObjectFile.h"
19 
20 using namespace llvm;
21 using namespace llvm::object;
22 
23 #define DEBUG_TYPE "dyld"
24 
25 namespace {
26 
27 class LoadedCOFFObjectInfo
28     : public RuntimeDyld::LoadedObjectInfoHelper<LoadedCOFFObjectInfo> {
29 public:
30   LoadedCOFFObjectInfo(RuntimeDyldImpl &RTDyld, unsigned BeginIdx,
31                        unsigned EndIdx)
32       : LoadedObjectInfoHelper(RTDyld, BeginIdx, EndIdx) {}
33 
34   OwningBinary<ObjectFile>
35   getObjectForDebug(const ObjectFile &Obj) const override {
36     return OwningBinary<ObjectFile>();
37   }
38 };
39 }
40 
41 namespace llvm {
42 
43 std::unique_ptr<RuntimeDyldCOFF>
44 llvm::RuntimeDyldCOFF::create(Triple::ArchType Arch,
45                               RuntimeDyld::MemoryManager &MemMgr,
46                               RuntimeDyld::SymbolResolver &Resolver) {
47   switch (Arch) {
48   default:
49     llvm_unreachable("Unsupported target for RuntimeDyldCOFF.");
50     break;
51   case Triple::x86_64:
52     return make_unique<RuntimeDyldCOFFX86_64>(MemMgr, Resolver);
53   }
54 }
55 
56 std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
57 RuntimeDyldCOFF::loadObject(const object::ObjectFile &O) {
58   unsigned SectionStartIdx, SectionEndIdx;
59   std::tie(SectionStartIdx, SectionEndIdx) = loadObjectImpl(O);
60   return llvm::make_unique<LoadedCOFFObjectInfo>(*this, SectionStartIdx,
61                                                  SectionEndIdx);
62 }
63 
64 uint64_t RuntimeDyldCOFF::getSymbolOffset(const SymbolRef &Sym) {
65   // The value in a relocatable COFF object is the offset.
66   return Sym.getValue();
67 }
68 
69 bool RuntimeDyldCOFF::isCompatibleFile(const object::ObjectFile &Obj) const {
70   return Obj.isCOFF();
71 }
72 
73 } // namespace llvm
74