--- /dev/null
+//===-- OrcArchitectureSupport.h - Architecture support code ---*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Architecture specific code for Orc, e.g. callback assembly.
+//
+// Architecture classes should be part of the JIT *target* process, not the host
+// process (except where you're doing hosted JITing and the two are one and the
+// same).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORC_ORCARCHITECTURESUPPORT_H
+#define LLVM_EXECUTIONENGINE_ORC_ORCARCHITECTURESUPPORT_H
+
+#include "IndirectionUtils.h"
+#include "llvm/Support/Memory.h"
+
+namespace llvm {
+namespace orc {
+
+class OrcX86_64 {
+public:
+ static const unsigned PageSize = 4096;
+ static const unsigned PointerSize = 8;
+ static const unsigned TrampolineSize = 8;
+ static const unsigned ResolverCodeSize = 0x78;
+
+ typedef TargetAddress (*JITReentryFn)(void *CallbackMgr,
+ void *TrampolineId);
+
+ /// @brief Write the resolver code into the given memory. The user is be
+ /// responsible for allocating the memory and setting permissions.
+ static void writeResolverCode(uint8_t *ResolveMem, JITReentryFn Reentry,
+ void *CallbackMgr);
+
+ /// @brief Write the requsted number of trampolines into the given memory,
+ /// which must be big enough to hold 1 pointer, plus NumTrampolines
+ /// trampolines.
+ static void writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
+ unsigned NumTrampolines);
+
+ /// @brief Provide information about stub blocks generated by the
+ /// makeIndirectStubsBlock function.
+ class IndirectStubsInfo {
+ friend class OrcX86_64;
+ public:
+ const static unsigned StubSize = 8;
+ const static unsigned PtrSize = 8;
+
+ IndirectStubsInfo() : NumStubs(0) {}
+ IndirectStubsInfo(IndirectStubsInfo &&Other)
+ : NumStubs(Other.NumStubs), StubsMem(std::move(Other.StubsMem)) {
+ Other.NumStubs = 0;
+ }
+ IndirectStubsInfo& operator=(IndirectStubsInfo &&Other) {
+ NumStubs = Other.NumStubs;
+ Other.NumStubs = 0;
+ StubsMem = std::move(Other.StubsMem);
+ return *this;
+ }
+
+ /// @brief Number of stubs in this block.
+ unsigned getNumStubs() const { return NumStubs; }
+
+ /// @brief Get a pointer to the stub at the given index, which must be in
+ /// the range 0 .. getNumStubs() - 1.
+ void* getStub(unsigned Idx) const {
+ return static_cast<uint64_t*>(StubsMem.base()) + Idx;
+ }
+
+ /// @brief Get a pointer to the implementation-pointer at the given index,
+ /// which must be in the range 0 .. getNumStubs() - 1.
+ void** getPtr(unsigned Idx) const {
+ char *PtrsBase =
+ static_cast<char*>(StubsMem.base()) + NumStubs * StubSize;
+ return reinterpret_cast<void**>(PtrsBase) + Idx;
+ }
+ private:
+ unsigned NumStubs;
+ sys::OwningMemoryBlock StubsMem;
+ };
+
+ /// @brief Emit at least MinStubs worth of indirect call stubs, rounded out to
+ /// the nearest page size.
+ ///
+ /// E.g. Asking for 4 stubs on x86-64, where stubs are 8-bytes, with 4k
+ /// pages will return a block of 512 stubs (4096 / 8 = 512). Asking for 513
+ /// will return a block of 1024 (2-pages worth).
+ static std::error_code emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
+ unsigned MinStubs,
+ void *InitialPtrVal);
+};
+
+} // End namespace orc.
+} // End namespace llvm.
+
+#endif // LLVM_EXECUTIONENGINE_ORC_ORCARCHITECTURESUPPORT_H