ExecutionEngine: Preliminary support for dynamically loadable coff objects
Provide basic support for dynamically loadable coff objects. Only handles a subset of x64 currently.
Patch by Andy Ayers!
Differential Revision: http://reviews.llvm.org/D7793
llvm-svn: 231574
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
new file mode 100644
index 0000000..4791f87
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp
@@ -0,0 +1,85 @@
+//===-- RuntimeDyldCOFF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of COFF support for the MC-JIT runtime dynamic linker.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RuntimeDyldCOFF.h"
+#include "Targets/RuntimeDyldCOFFX86_64.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Object/ObjectFile.h"
+
+using namespace llvm;
+using namespace llvm::object;
+
+#define DEBUG_TYPE "dyld"
+
+namespace {
+
+class LoadedCOFFObjectInfo : public RuntimeDyld::LoadedObjectInfo {
+public:
+ LoadedCOFFObjectInfo(RuntimeDyldImpl &RTDyld, unsigned BeginIdx,
+ unsigned EndIdx)
+ : RuntimeDyld::LoadedObjectInfo(RTDyld, BeginIdx, EndIdx) {}
+
+ OwningBinary<ObjectFile>
+ getObjectForDebug(const ObjectFile &Obj) const override {
+ return OwningBinary<ObjectFile>();
+ }
+};
+}
+
+namespace llvm {
+
+std::unique_ptr<RuntimeDyldCOFF>
+llvm::RuntimeDyldCOFF::create(Triple::ArchType Arch, RTDyldMemoryManager *MM) {
+ switch (Arch) {
+ default:
+ llvm_unreachable("Unsupported target for RuntimeDyldCOFF.");
+ break;
+ case Triple::x86_64:
+ return make_unique<RuntimeDyldCOFFX86_64>(MM);
+ }
+}
+
+std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+RuntimeDyldCOFF::loadObject(const object::ObjectFile &O) {
+ unsigned SectionStartIdx, SectionEndIdx;
+ std::tie(SectionStartIdx, SectionEndIdx) = loadObjectImpl(O);
+ return llvm::make_unique<LoadedCOFFObjectInfo>(*this, SectionStartIdx,
+ SectionEndIdx);
+}
+
+uint64_t RuntimeDyldCOFF::getSymbolOffset(const SymbolRef &Sym) {
+ uint64_t Address;
+ if (std::error_code EC = Sym.getAddress(Address))
+ return UnknownAddressOrSize;
+
+ if (Address == UnknownAddressOrSize)
+ return UnknownAddressOrSize;
+
+ const ObjectFile *Obj = Sym.getObject();
+ section_iterator SecI(Obj->section_end());
+ if (std::error_code EC = Sym.getSection(SecI))
+ return UnknownAddressOrSize;
+
+ if (SecI == Obj->section_end())
+ return UnknownAddressOrSize;
+
+ uint64_t SectionAddress = SecI->getAddress();
+ return Address - SectionAddress;
+}
+
+bool RuntimeDyldCOFF::isCompatibleFile(const object::ObjectFile &Obj) const {
+ return Obj.isCOFF();
+}
+
+} // namespace llvm