1 //===-- RISCVMCAsmInfo.cpp - RISCV Asm properties -------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains the declarations of the RISCVMCAsmInfo properties. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "RISCVMCAsmInfo.h" 14 #include "MCTargetDesc/RISCVMCExpr.h" 15 #include "llvm/ADT/Triple.h" 16 #include "llvm/BinaryFormat/Dwarf.h" 17 #include "llvm/MC/MCStreamer.h" 18 using namespace llvm; 19 20 void RISCVMCAsmInfo::anchor() {} 21 22 RISCVMCAsmInfo::RISCVMCAsmInfo(const Triple &TT) { 23 CodePointerSize = CalleeSaveStackSlotSize = TT.isArch64Bit() ? 8 : 4; 24 CommentString = "#"; 25 AlignmentIsInBytes = false; 26 SupportsDebugInformation = true; 27 ExceptionsType = ExceptionHandling::DwarfCFI; 28 Data16bitsDirective = "\t.half\t"; 29 Data32bitsDirective = "\t.word\t"; 30 } 31 32 const MCExpr *RISCVMCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym, 33 unsigned Encoding, 34 MCStreamer &Streamer) const { 35 if (!(Encoding & dwarf::DW_EH_PE_pcrel)) 36 return MCAsmInfo::getExprForFDESymbol(Sym, Encoding, Streamer); 37 38 // The default symbol subtraction results in an ADD/SUB relocation pair. 39 // Processing this relocation pair is problematic when linker relaxation is 40 // enabled, so we follow binutils in using the R_RISCV_32_PCREL relocation 41 // for the FDE initial location. 42 MCContext &Ctx = Streamer.getContext(); 43 const MCExpr *ME = 44 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, Ctx); 45 assert(Encoding & dwarf::DW_EH_PE_sdata4 && "Unexpected encoding"); 46 return RISCVMCExpr::create(ME, RISCVMCExpr::VK_RISCV_32_PCREL, Ctx); 47 } 48