Add to RuntimeDyld support different object formats
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135037 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h
new file mode 100644
index 0000000..bcdfb04
--- /dev/null
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h
@@ -0,0 +1,152 @@
+//===-- RuntimeDyldImpl.h - 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.
+//
+//===----------------------------------------------------------------------===//
+//
+// Interface for the implementations of runtime dynamic linker facilities.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_RUNTIME_DYLD_IMPL_H
+#define LLVM_RUNTIME_DYLD_IMPL_H
+
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "llvm/Object/MachOObject.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/Memory.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/system_error.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+using namespace llvm::object;
+
+namespace llvm {
+class RuntimeDyldImpl {
+protected:
+ unsigned CPUType;
+ unsigned CPUSubtype;
+
+ // The MemoryManager to load objects into.
+ RTDyldMemoryManager *MemMgr;
+
+ // FIXME: This all assumes we're dealing with external symbols for anything
+ // explicitly referenced. I.e., we can index by name and things
+ // will work out. In practice, this may not be the case, so we
+ // should find a way to effectively generalize.
+
+ // For each function, we have a MemoryBlock of it's instruction data.
+ StringMap<sys::MemoryBlock> Functions;
+
+ // Master symbol table. As modules are loaded and external symbols are
+ // resolved, their addresses are stored here.
+ StringMap<uint8_t*> SymbolTable;
+
+ bool HasError;
+ std::string ErrorStr;
+
+ // Set the error state and record an error string.
+ bool Error(const Twine &Msg) {
+ ErrorStr = Msg.str();
+ HasError = true;
+ return true;
+ }
+
+ void extractFunction(StringRef Name, uint8_t *StartAddress,
+ uint8_t *EndAddress);
+
+public:
+ RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}
+
+ virtual ~RuntimeDyldImpl();
+
+ virtual bool loadObject(MemoryBuffer *InputBuffer) = 0;
+
+ void *getSymbolAddress(StringRef Name) {
+ // FIXME: Just look up as a function for now. Overly simple of course.
+ // Work in progress.
+ return SymbolTable.lookup(Name);
+ }
+
+ void resolveRelocations();
+
+ virtual void reassignSymbolAddress(StringRef Name, uint8_t *Addr) = 0;
+
+ // Is the linker in an error state?
+ bool hasError() { return HasError; }
+
+ // Mark the error condition as handled and continue.
+ void clearError() { HasError = false; }
+
+ // Get the error message.
+ StringRef getErrorString() { return ErrorStr; }
+
+ virtual bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const = 0;
+};
+
+
+class RuntimeDyldMachO : public RuntimeDyldImpl {
+
+ // For each symbol, keep a list of relocations based on it. Anytime
+ // its address is reassigned (the JIT re-compiled the function, e.g.),
+ // the relocations get re-resolved.
+ struct RelocationEntry {
+ std::string Target; // Object this relocation is contained in.
+ uint64_t Offset; // Offset into the object for the relocation.
+ uint32_t Data; // Second word of the raw macho relocation entry.
+ int64_t Addend; // Addend encoded in the instruction itself, if any.
+ bool isResolved; // Has this relocation been resolved previously?
+
+ RelocationEntry(StringRef t, uint64_t offset, uint32_t data, int64_t addend)
+ : Target(t), Offset(offset), Data(data), Addend(addend),
+ isResolved(false) {}
+ };
+ typedef SmallVector<RelocationEntry, 4> RelocationList;
+ StringMap<RelocationList> Relocations;
+
+ // FIXME: Also keep a map of all the relocations contained in an object. Use
+ // this to dynamically answer whether all of the relocations in it have
+ // been resolved or not.
+
+ bool resolveRelocation(uint8_t *Address, uint8_t *Value, bool isPCRel,
+ unsigned Type, unsigned Size);
+ bool resolveX86_64Relocation(uintptr_t Address, uintptr_t Value, bool isPCRel,
+ unsigned Type, unsigned Size);
+ bool resolveARMRelocation(uintptr_t Address, uintptr_t Value, bool isPCRel,
+ unsigned Type, unsigned Size);
+
+ bool loadSegment32(const MachOObject *Obj,
+ const MachOObject::LoadCommandInfo *SegmentLCI,
+ const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
+ bool loadSegment64(const MachOObject *Obj,
+ const MachOObject::LoadCommandInfo *SegmentLCI,
+ const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
+
+public:
+ RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
+
+ bool loadObject(MemoryBuffer *InputBuffer);
+
+ void reassignSymbolAddress(StringRef Name, uint8_t *Addr);
+
+ static bool isKnownFormat(const MemoryBuffer *InputBuffer);
+
+ bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
+ return isKnownFormat(InputBuffer);
+ };
+};
+
+} // end namespace llvm
+
+
+#endif