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//===-- BPFAsmPrinter.cpp - BPF LLVM assembly writer ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to the BPF assembly language.
//
//===----------------------------------------------------------------------===//
#include "BPF.h"
#include "BPFInstrInfo.h"
#include "BPFMCInstLower.h"
#include "BPFTargetMachine.h"
#include "InstPrinter/BPFInstPrinter.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
namespace {
class BPFAsmPrinter : public AsmPrinter {
public:
explicit BPFAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)) {}
const char *getPassName() const override { return "BPF Assembly Printer"; }
void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
const char *Modifier = nullptr);
void EmitInstruction(const MachineInstr *MI) override;
};
}
void BPFAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
raw_ostream &O, const char *Modifier) {
const MachineOperand &MO = MI->getOperand(OpNum);
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << BPFInstPrinter::getRegisterName(MO.getReg());
break;
case MachineOperand::MO_Immediate:
O << MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
break;
case MachineOperand::MO_GlobalAddress:
O << *getSymbol(MO.getGlobal());
break;
default:
llvm_unreachable("<unknown operand type>");
}
}
void BPFAsmPrinter::EmitInstruction(const MachineInstr *MI) {
BPFMCInstLower MCInstLowering(OutContext, *this);
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
EmitToStreamer(OutStreamer, TmpInst);
}
// Force static initialization.
extern "C" void LLVMInitializeBPFAsmPrinter() {
RegisterAsmPrinter<BPFAsmPrinter> X(TheBPFTarget);
}
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