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//===-- Assembler.h ---------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Defines classes to assemble functions composed of a single basic block of
/// MCInsts.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_EXEGESIS_ASSEMBLER_H
#define LLVM_TOOLS_LLVM_EXEGESIS_ASSEMBLER_H
#include <memory>
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
namespace exegesis {
class ExegesisTarget;
// Gather the set of reserved registers (depends on function's calling
// convention and target machine).
llvm::BitVector getFunctionReservedRegs(const llvm::TargetMachine &TM);
// Creates a temporary `void foo()` function containing the provided
// Instructions. Runs a set of llvm Passes to provide correct prologue and
// epilogue. Once the MachineFunction is ready, it is assembled for TM to
// AsmStream, the temporary function is eventually discarded.
void assembleToStream(const ExegesisTarget &ET,
std::unique_ptr<llvm::LLVMTargetMachine> TM,
llvm::ArrayRef<unsigned> RegsToDef,
llvm::ArrayRef<llvm::MCInst> Instructions,
llvm::raw_pwrite_stream &AsmStream);
// Creates an ObjectFile in the format understood by the host.
// Note: the resulting object keeps a copy of Buffer so it can be discarded once
// this function returns.
llvm::object::OwningBinary<llvm::object::ObjectFile>
getObjectFromBuffer(llvm::StringRef Buffer);
// Loads the content of Filename as on ObjectFile and returns it.
llvm::object::OwningBinary<llvm::object::ObjectFile>
getObjectFromFile(llvm::StringRef Filename);
// Consumes an ObjectFile containing a `void foo()` function and make it
// executable.
struct ExecutableFunction {
explicit ExecutableFunction(
std::unique_ptr<llvm::LLVMTargetMachine> TM,
llvm::object::OwningBinary<llvm::object::ObjectFile> &&ObjectFileHolder);
// Retrieves the function as an array of bytes.
llvm::StringRef getFunctionBytes() const { return FunctionBytes; }
// Executes the function.
void operator()() const { ((void (*)())(intptr_t)FunctionBytes.data())(); }
std::unique_ptr<llvm::LLVMContext> Context;
std::unique_ptr<llvm::ExecutionEngine> ExecEngine;
llvm::StringRef FunctionBytes;
};
} // namespace exegesis
#endif // LLVM_TOOLS_LLVM_EXEGESIS_ASSEMBLER_H
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