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//===-- LoongArchMCExpr.cpp - LoongArch specific MC expression classes ----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the implementation of the assembly expression modifiers
// accepted by the LoongArch architecture.
//
//===----------------------------------------------------------------------===//
#include "LoongArchMCExpr.h"
#include "LoongArchAsmBackend.h"
#include "LoongArchFixupKinds.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
#define DEBUG_TYPE "loongarch-mcexpr"
const LoongArchMCExpr *LoongArchMCExpr::create(const MCExpr *Expr,
VariantKind Kind, MCContext &Ctx,
bool Hint) {
return new (Ctx) LoongArchMCExpr(Expr, Kind, Hint);
}
void LoongArchMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
VariantKind Kind = getKind();
bool HasVariant =
((Kind != VK_LoongArch_None) && (Kind != VK_LoongArch_CALL));
if (HasVariant)
OS << '%' << getVariantKindName(getKind()) << '(';
Expr->print(OS, MAI);
if (HasVariant)
OS << ')';
}
bool LoongArchMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout,
const MCFixup *Fixup) const {
// Explicitly drop the layout and assembler to prevent any symbolic folding in
// the expression handling. This is required to preserve symbolic difference
// expressions to emit the paired relocations.
if (!getSubExpr()->evaluateAsRelocatable(Res, nullptr, nullptr))
return false;
Res =
MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(), getKind());
// Custom fixup types are not valid with symbol difference expressions.
return Res.getSymB() ? getKind() == VK_LoongArch_None : true;
}
void LoongArchMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
StringRef LoongArchMCExpr::getVariantKindName(VariantKind Kind) {
switch (Kind) {
default:
llvm_unreachable("Invalid ELF symbol kind");
case VK_LoongArch_CALL_PLT:
return "plt";
case VK_LoongArch_B16:
return "b16";
case VK_LoongArch_B21:
return "b21";
case VK_LoongArch_B26:
return "b21";
case VK_LoongArch_ABS_HI20:
return "abs_hi20";
case VK_LoongArch_ABS_LO12:
return "abs_lo12";
case VK_LoongArch_ABS64_LO20:
return "abs64_lo20";
case VK_LoongArch_ABS64_HI12:
return "abs64_hi12";
case VK_LoongArch_PCALA_HI20:
return "pc_hi20";
case VK_LoongArch_PCALA_LO12:
return "pc_lo12";
case VK_LoongArch_PCALA64_LO20:
return "pc64_lo20";
case VK_LoongArch_PCALA64_HI12:
return "pc64_hi12";
case VK_LoongArch_GOT_PC_HI20:
return "got_pc_hi20";
case VK_LoongArch_GOT_PC_LO12:
return "got_pc_lo12";
case VK_LoongArch_GOT64_PC_LO20:
return "got64_pc_lo20";
case VK_LoongArch_GOT64_PC_HI12:
return "got64_pc_hi12";
case VK_LoongArch_GOT_HI20:
return "got_hi20";
case VK_LoongArch_GOT_LO12:
return "got_lo12";
case VK_LoongArch_GOT64_LO20:
return "got64_lo20";
case VK_LoongArch_GOT64_HI12:
return "got64_hi12";
case VK_LoongArch_TLS_LE_HI20:
return "le_hi20";
case VK_LoongArch_TLS_LE_LO12:
return "le_lo12";
case VK_LoongArch_TLS_LE64_LO20:
return "le64_lo20";
case VK_LoongArch_TLS_LE64_HI12:
return "le64_hi12";
case VK_LoongArch_TLS_IE_PC_HI20:
return "ie_pc_hi20";
case VK_LoongArch_TLS_IE_PC_LO12:
return "ie_pc_lo12";
case VK_LoongArch_TLS_IE64_PC_LO20:
return "ie64_pc_lo20";
case VK_LoongArch_TLS_IE64_PC_HI12:
return "ie64_pc_hi12";
case VK_LoongArch_TLS_IE_HI20:
return "ie_hi20";
case VK_LoongArch_TLS_IE_LO12:
return "ie_lo12";
case VK_LoongArch_TLS_IE64_LO20:
return "ie64_lo20";
case VK_LoongArch_TLS_IE64_HI12:
return "ie64_hi12";
case VK_LoongArch_TLS_LD_PC_HI20:
return "ld_pc_hi20";
case VK_LoongArch_TLS_LD_HI20:
return "ld_hi20";
case VK_LoongArch_TLS_GD_PC_HI20:
return "gd_pc_hi20";
case VK_LoongArch_TLS_GD_HI20:
return "gd_hi20";
}
}
LoongArchMCExpr::VariantKind
LoongArchMCExpr::getVariantKindForName(StringRef name) {
return StringSwitch<LoongArchMCExpr::VariantKind>(name)
.Case("plt", VK_LoongArch_CALL_PLT)
.Case("b16", VK_LoongArch_B16)
.Case("b21", VK_LoongArch_B21)
.Case("b26", VK_LoongArch_B26)
.Case("abs_hi20", VK_LoongArch_ABS_HI20)
.Case("abs_lo12", VK_LoongArch_ABS_LO12)
.Case("abs64_lo20", VK_LoongArch_ABS64_LO20)
.Case("abs64_hi12", VK_LoongArch_ABS64_HI12)
.Case("pc_hi20", VK_LoongArch_PCALA_HI20)
.Case("pc_lo12", VK_LoongArch_PCALA_LO12)
.Case("pc64_lo20", VK_LoongArch_PCALA64_LO20)
.Case("pc64_hi12", VK_LoongArch_PCALA64_HI12)
.Case("got_pc_hi20", VK_LoongArch_GOT_PC_HI20)
.Case("got_pc_lo12", VK_LoongArch_GOT_PC_LO12)
.Case("got64_pc_lo20", VK_LoongArch_GOT64_PC_LO20)
.Case("got64_pc_hi12", VK_LoongArch_GOT64_PC_HI12)
.Case("got_hi20", VK_LoongArch_GOT_HI20)
.Case("got_lo12", VK_LoongArch_GOT_LO12)
.Case("got64_lo20", VK_LoongArch_GOT64_LO20)
.Case("got64_hi12", VK_LoongArch_GOT64_HI12)
.Case("le_hi20", VK_LoongArch_TLS_LE_HI20)
.Case("le_lo12", VK_LoongArch_TLS_LE_LO12)
.Case("le64_lo20", VK_LoongArch_TLS_LE64_LO20)
.Case("le64_hi12", VK_LoongArch_TLS_LE64_HI12)
.Case("ie_pc_hi20", VK_LoongArch_TLS_IE_PC_HI20)
.Case("ie_pc_lo12", VK_LoongArch_TLS_IE_PC_LO12)
.Case("ie64_pc_lo20", VK_LoongArch_TLS_IE64_PC_LO20)
.Case("ie64_pc_hi12", VK_LoongArch_TLS_IE64_PC_HI12)
.Case("ie_hi20", VK_LoongArch_TLS_IE_HI20)
.Case("ie_lo12", VK_LoongArch_TLS_IE_LO12)
.Case("ie64_lo20", VK_LoongArch_TLS_IE64_LO20)
.Case("ie64_hi12", VK_LoongArch_TLS_IE64_HI12)
.Case("ld_pc_hi20", VK_LoongArch_TLS_LD_PC_HI20)
.Case("ld_hi20", VK_LoongArch_TLS_LD_HI20)
.Case("gd_pc_hi20", VK_LoongArch_TLS_GD_PC_HI20)
.Case("gd_hi20", VK_LoongArch_TLS_GD_HI20)
.Default(VK_LoongArch_Invalid);
}
static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
switch (Expr->getKind()) {
case MCExpr::Target:
llvm_unreachable("Can't handle nested target expression");
break;
case MCExpr::Constant:
break;
case MCExpr::Unary:
fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
break;
case MCExpr::Binary: {
const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
fixELFSymbolsInTLSFixupsImpl(BE->getLHS(), Asm);
fixELFSymbolsInTLSFixupsImpl(BE->getRHS(), Asm);
break;
}
case MCExpr::SymbolRef: {
// We're known to be under a TLS fixup, so any symbol should be
// modified. There should be only one.
const MCSymbolRefExpr &SymRef = *cast<MCSymbolRefExpr>(Expr);
cast<MCSymbolELF>(SymRef.getSymbol()).setType(ELF::STT_TLS);
break;
}
}
}
void LoongArchMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
switch (getKind()) {
default:
return;
case VK_LoongArch_TLS_LE_HI20:
case VK_LoongArch_TLS_IE_PC_HI20:
case VK_LoongArch_TLS_IE_HI20:
case VK_LoongArch_TLS_LD_PC_HI20:
case VK_LoongArch_TLS_LD_HI20:
case VK_LoongArch_TLS_GD_PC_HI20:
case VK_LoongArch_TLS_GD_HI20:
break;
}
fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
}
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