//===-- BPFInstPrinter.cpp - Convert BPF MCInst to asm syntax -------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This class prints an BPF MCInst to a .s file. // //===----------------------------------------------------------------------===// #include "BPF.h" #include "BPFInstPrinter.h" #include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCInst.h" #include "llvm/MC/MCSymbol.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/FormattedStream.h" using namespace llvm; #define DEBUG_TYPE "asm-printer" // Include the auto-generated portion of the assembly writer. #include "BPFGenAsmWriter.inc" void BPFInstPrinter::printInst(const MCInst *MI, raw_ostream &O, StringRef Annot, const MCSubtargetInfo &STI) { printInstruction(MI, O); printAnnotation(O, Annot); } static void printExpr(const MCExpr *Expr, raw_ostream &O) { #ifndef NDEBUG const MCSymbolRefExpr *SRE; if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS()); else SRE = dyn_cast<MCSymbolRefExpr>(Expr); assert(SRE && "Unexpected MCExpr type."); MCSymbolRefExpr::VariantKind Kind = SRE->getKind(); assert(Kind == MCSymbolRefExpr::VK_None); #endif O << *Expr; } void BPFInstPrinter::printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O, const char *Modifier) { assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported"); const MCOperand &Op = MI->getOperand(OpNo); if (Op.isReg()) { O << getRegisterName(Op.getReg()); } else if (Op.isImm()) { O << (int32_t)Op.getImm(); } else { assert(Op.isExpr() && "Expected an expression"); printExpr(Op.getExpr(), O); } } void BPFInstPrinter::printMemOperand(const MCInst *MI, int OpNo, raw_ostream &O, const char *Modifier) { const MCOperand &RegOp = MI->getOperand(OpNo); const MCOperand &OffsetOp = MI->getOperand(OpNo + 1); // offset if (OffsetOp.isImm()) O << formatDec(OffsetOp.getImm()); else assert(0 && "Expected an immediate"); // register assert(RegOp.isReg() && "Register operand not a register"); O << '(' << getRegisterName(RegOp.getReg()) << ')'; } void BPFInstPrinter::printImm64Operand(const MCInst *MI, unsigned OpNo, raw_ostream &O) { const MCOperand &Op = MI->getOperand(OpNo); if (Op.isImm()) O << (uint64_t)Op.getImm(); else O << Op; }