1//===-- RISCVMCAsmInfo.cpp - RISC-V 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/BinaryFormat/Dwarf.h"
16#include "llvm/MC/MCStreamer.h"
17#include "llvm/TargetParser/Triple.h"
18using namespace llvm;
19
20void RISCVMCAsmInfo::anchor() {}
21
22RISCVMCAsmInfo::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
32const 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