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 "llvm/BinaryFormat/Dwarf.h"
15#include "llvm/BinaryFormat/ELF.h"
16#include "llvm/MC/MCExpr.h"
17#include "llvm/MC/MCStreamer.h"
18#include "llvm/TargetParser/Triple.h"
19using namespace llvm;
20
21void RISCVMCAsmInfo::anchor() {}
22
23RISCVMCAsmInfo::RISCVMCAsmInfo(const Triple &TT) {
24 CodePointerSize = CalleeSaveStackSlotSize = TT.isArch64Bit() ? 8 : 4;
25 CommentString = "#";
26 AlignmentIsInBytes = false;
27 SupportsDebugInformation = true;
28 ExceptionsType = ExceptionHandling::DwarfCFI;
29 UseAtForSpecifier = false;
30 Data16bitsDirective = "\t.half\t";
31 Data32bitsDirective = "\t.word\t";
32}
33
34const MCExpr *RISCVMCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,
35 unsigned Encoding,
36 MCStreamer &Streamer) const {
37 if (!(Encoding & dwarf::DW_EH_PE_pcrel))
38 return MCAsmInfo::getExprForFDESymbol(Sym, Encoding, Streamer);
39
40 // The default symbol subtraction results in an ADD/SUB relocation pair.
41 // Processing this relocation pair is problematic when linker relaxation is
42 // enabled, so we follow binutils in using the R_RISCV_32_PCREL relocation
43 // for the FDE initial location.
44 MCContext &Ctx = Streamer.getContext();
45 const MCExpr *ME = MCSymbolRefExpr::create(Symbol: Sym, Ctx);
46 assert(Encoding & dwarf::DW_EH_PE_sdata4 && "Unexpected encoding");
47 return MCSpecifierExpr::create(Expr: ME, S: ELF::R_RISCV_32_PCREL, Ctx);
48}
49
50void RISCVMCAsmInfo::printSpecifierExpr(raw_ostream &OS,
51 const MCSpecifierExpr &Expr) const {
52 auto S = Expr.getSpecifier();
53 bool HasSpecifier = S != 0 && S != ELF::R_RISCV_CALL_PLT;
54 if (HasSpecifier)
55 OS << '%' << RISCV::getSpecifierName(Kind: S) << '(';
56 printExpr(OS, *Expr.getSubExpr());
57 if (HasSpecifier)
58 OS << ')';
59}
60