140 lines
4.6 KiB
C++
140 lines
4.6 KiB
C++
//===-- BPFAsmPrinter.cpp - BPF LLVM assembly writer ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to the BPF assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "BPF.h"
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#include "BPFInstrInfo.h"
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#include "BPFMCInstLower.h"
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#include "BPFTargetMachine.h"
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#include "InstPrinter/BPFInstPrinter.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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namespace {
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class BPFAsmPrinter : public AsmPrinter {
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public:
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explicit BPFAsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)) {}
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StringRef getPassName() const override { return "BPF Assembly Printer"; }
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void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O) override;
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void EmitInstruction(const MachineInstr *MI) override;
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};
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} // namespace
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void BPFAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
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raw_ostream &O) {
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const MachineOperand &MO = MI->getOperand(OpNum);
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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O << BPFInstPrinter::getRegisterName(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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break;
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case MachineOperand::MO_MachineBasicBlock:
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O << *MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_GlobalAddress:
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O << *getSymbol(MO.getGlobal());
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break;
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case MachineOperand::MO_BlockAddress: {
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MCSymbol *BA = GetBlockAddressSymbol(MO.getBlockAddress());
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O << BA->getName();
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break;
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}
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case MachineOperand::MO_ExternalSymbol:
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O << *GetExternalSymbolSymbol(MO.getSymbolName());
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break;
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_ConstantPoolIndex:
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default:
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llvm_unreachable("<unknown operand type>");
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}
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}
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bool BPFAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned /*AsmVariant*/,
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const char *ExtraCode, raw_ostream &O) {
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if (ExtraCode && ExtraCode[0])
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return true; // BPF does not have special modifiers
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printOperand(MI, OpNo, O);
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return false;
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}
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bool BPFAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
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unsigned OpNum, unsigned AsmVariant,
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const char *ExtraCode,
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raw_ostream &O) {
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assert(OpNum + 1 < MI->getNumOperands() && "Insufficient operands");
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const MachineOperand &BaseMO = MI->getOperand(OpNum);
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const MachineOperand &OffsetMO = MI->getOperand(OpNum + 1);
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assert(BaseMO.isReg() && "Unexpected base pointer for inline asm memory operand.");
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assert(OffsetMO.isImm() && "Unexpected offset for inline asm memory operand.");
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int Offset = OffsetMO.getImm();
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if (ExtraCode)
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return true; // Unknown modifier.
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if (Offset < 0)
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O << "(" << BPFInstPrinter::getRegisterName(BaseMO.getReg()) << " - " << -Offset << ")";
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else
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O << "(" << BPFInstPrinter::getRegisterName(BaseMO.getReg()) << " + " << Offset << ")";
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return false;
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}
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void BPFAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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BPFMCInstLower MCInstLowering(OutContext, *this);
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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EmitToStreamer(*OutStreamer, TmpInst);
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}
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// Force static initialization.
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extern "C" void LLVMInitializeBPFAsmPrinter() {
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RegisterAsmPrinter<BPFAsmPrinter> X(getTheBPFleTarget());
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RegisterAsmPrinter<BPFAsmPrinter> Y(getTheBPFbeTarget());
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RegisterAsmPrinter<BPFAsmPrinter> Z(getTheBPFTarget());
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}
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