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133 lines
4.4 KiB
133 lines
4.4 KiB
//===-- Assembler.h ---------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Defines classes to assemble functions composed of a single basic block of
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/// MCInsts.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_ASSEMBLER_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_ASSEMBLER_H
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#include <memory>
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#include "BenchmarkCode.h"
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#include "Error.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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namespace exegesis {
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class ExegesisTarget;
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// Gather the set of reserved registers (depends on function's calling
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// convention and target machine).
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BitVector getFunctionReservedRegs(const TargetMachine &TM);
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// Helper to fill in a basic block.
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class BasicBlockFiller {
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public:
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BasicBlockFiller(MachineFunction &MF, MachineBasicBlock *MBB,
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const MCInstrInfo *MCII);
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void addInstruction(const MCInst &Inst, const DebugLoc &DL = DebugLoc());
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void addInstructions(ArrayRef<MCInst> Insts, const DebugLoc &DL = DebugLoc());
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void addReturn(const DebugLoc &DL = DebugLoc());
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MachineFunction &MF;
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MachineBasicBlock *const MBB;
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const MCInstrInfo *const MCII;
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};
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// Helper to fill in a function.
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class FunctionFiller {
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public:
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FunctionFiller(MachineFunction &MF, std::vector<unsigned> RegistersSetUp);
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// Adds a basic block to the function.
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BasicBlockFiller addBasicBlock();
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// Returns the function entry point.
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BasicBlockFiller getEntry() { return Entry; }
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MachineFunction &MF;
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const MCInstrInfo *const MCII;
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// Returns the set of registers in the snippet setup code.
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ArrayRef<unsigned> getRegistersSetUp() const;
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private:
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BasicBlockFiller Entry;
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// The set of registers that are set up in the basic block.
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std::vector<unsigned> RegistersSetUp;
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};
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// A callback that fills a function.
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using FillFunction = std::function<void(FunctionFiller &)>;
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// Creates a temporary `void foo(char*)` function containing the provided
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// Instructions. Runs a set of llvm Passes to provide correct prologue and
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// epilogue. Once the MachineFunction is ready, it is assembled for TM to
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// AsmStream, the temporary function is eventually discarded.
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Error assembleToStream(const ExegesisTarget &ET,
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std::unique_ptr<LLVMTargetMachine> TM,
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ArrayRef<unsigned> LiveIns,
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ArrayRef<RegisterValue> RegisterInitialValues,
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const FillFunction &Fill, raw_pwrite_stream &AsmStream);
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// Creates an ObjectFile in the format understood by the host.
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// Note: the resulting object keeps a copy of Buffer so it can be discarded once
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// this function returns.
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object::OwningBinary<object::ObjectFile> getObjectFromBuffer(StringRef Buffer);
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// Loads the content of Filename as on ObjectFile and returns it.
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object::OwningBinary<object::ObjectFile> getObjectFromFile(StringRef Filename);
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// Consumes an ObjectFile containing a `void foo(char*)` function and make it
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// executable.
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struct ExecutableFunction {
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explicit ExecutableFunction(
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std::unique_ptr<LLVMTargetMachine> TM,
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object::OwningBinary<object::ObjectFile> &&ObjectFileHolder);
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// Retrieves the function as an array of bytes.
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StringRef getFunctionBytes() const { return FunctionBytes; }
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// Executes the function.
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void operator()(char *Memory) const {
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((void (*)(char *))(intptr_t)FunctionBytes.data())(Memory);
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}
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std::unique_ptr<LLVMContext> Context;
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std::unique_ptr<ExecutionEngine> ExecEngine;
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StringRef FunctionBytes;
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};
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// Creates a void(int8*) MachineFunction.
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MachineFunction &createVoidVoidPtrMachineFunction(StringRef FunctionID,
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Module *Module,
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MachineModuleInfo *MMI);
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_ASSEMBLER_H
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