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llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchMCExpr.cpp
- This file was added.
| //===-- 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/MCValue.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) { | |||||
| return new (Ctx) LoongArchMCExpr(Expr, Kind); | |||||
| } | |||||
| 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_PCREL_HI: | |||||
| return "pc_hi20"; | |||||
| case VK_LoongArch_PCREL_LO: | |||||
| return "pc_lo12"; | |||||
| } | |||||
| } | |||||
| LoongArchMCExpr::VariantKind | |||||
| LoongArchMCExpr::getVariantKindForName(StringRef name) { | |||||
| return StringSwitch<LoongArchMCExpr::VariantKind>(name) | |||||
| .Case("pc_hi20", VK_LoongArch_PCREL_HI) | |||||
| .Case("pc_lo12", VK_LoongArch_PCREL_LO) | |||||
| .Case("plt", VK_LoongArch_CALL_PLT) | |||||
| .Default(VK_LoongArch_Invalid); | |||||
| } | |||||