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//===-- VEMCExpr.cpp - VE 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 VE architecture (e.g. "%hi", "%lo", ...).
//
//===----------------------------------------------------------------------===//
#include "VEMCExpr.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Casting.h"
using namespace llvm;
#define DEBUG_TYPE "vemcexpr"
const VEMCExpr *VEMCExpr::create(VariantKind Kind, const MCExpr *Expr,
MCContext &Ctx) {
return new (Ctx) VEMCExpr(Kind, Expr);
}
void VEMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
bool closeParen = printVariantKind(OS, Kind);
const MCExpr *Expr = getSubExpr();
Expr->print(OS, MAI);
if (closeParen)
OS << ')';
printVariantKindSuffix(OS, Kind);
}
bool VEMCExpr::printVariantKind(raw_ostream &OS, VariantKind Kind) {
switch (Kind) {
case VK_VE_None:
case VK_VE_REFLONG:
return false;
case VK_VE_HI32:
case VK_VE_LO32:
case VK_VE_PC_HI32:
case VK_VE_PC_LO32:
case VK_VE_GOT_HI32:
case VK_VE_GOT_LO32:
case VK_VE_GOTOFF_HI32:
case VK_VE_GOTOFF_LO32:
case VK_VE_PLT_HI32:
case VK_VE_PLT_LO32:
case VK_VE_TLS_GD_HI32:
case VK_VE_TLS_GD_LO32:
case VK_VE_TPOFF_HI32:
case VK_VE_TPOFF_LO32:
// Use suffix for these variant kinds
return false;
}
return true;
}
void VEMCExpr::printVariantKindSuffix(raw_ostream &OS, VariantKind Kind) {
switch (Kind) {
case VK_VE_None:
case VK_VE_REFLONG:
break;
case VK_VE_HI32:
OS << "@hi";
break;
case VK_VE_LO32:
OS << "@lo";
break;
case VK_VE_PC_HI32:
OS << "@pc_hi";
break;
case VK_VE_PC_LO32:
OS << "@pc_lo";
break;
case VK_VE_GOT_HI32:
OS << "@got_hi";
break;
case VK_VE_GOT_LO32:
OS << "@got_lo";
break;
case VK_VE_GOTOFF_HI32:
OS << "@gotoff_hi";
break;
case VK_VE_GOTOFF_LO32:
OS << "@gotoff_lo";
break;
case VK_VE_PLT_HI32:
OS << "@plt_hi";
break;
case VK_VE_PLT_LO32:
OS << "@plt_lo";
break;
case VK_VE_TLS_GD_HI32:
OS << "@tls_gd_hi";
break;
case VK_VE_TLS_GD_LO32:
OS << "@tls_gd_lo";
break;
case VK_VE_TPOFF_HI32:
OS << "@tpoff_hi";
break;
case VK_VE_TPOFF_LO32:
OS << "@tpoff_lo";
break;
}
}
VEMCExpr::VariantKind VEMCExpr::parseVariantKind(StringRef name) {
return StringSwitch<VEMCExpr::VariantKind>(name)
.Case("hi", VK_VE_HI32)
.Case("lo", VK_VE_LO32)
.Case("pc_hi", VK_VE_PC_HI32)
.Case("pc_lo", VK_VE_PC_LO32)
.Case("got_hi", VK_VE_GOT_HI32)
.Case("got_lo", VK_VE_GOT_LO32)
.Case("gotoff_hi", VK_VE_GOTOFF_HI32)
.Case("gotoff_lo", VK_VE_GOTOFF_LO32)
.Case("plt_hi", VK_VE_PLT_HI32)
.Case("plt_lo", VK_VE_PLT_LO32)
.Case("tls_gd_hi", VK_VE_TLS_GD_HI32)
.Case("tls_gd_lo", VK_VE_TLS_GD_LO32)
.Case("tpoff_hi", VK_VE_TPOFF_HI32)
.Case("tpoff_lo", VK_VE_TPOFF_LO32)
.Default(VK_VE_None);
}
VE::Fixups VEMCExpr::getFixupKind(VEMCExpr::VariantKind Kind) {
switch (Kind) {
default:
llvm_unreachable("Unhandled VEMCExpr::VariantKind");
case VK_VE_REFLONG:
return VE::fixup_ve_reflong;
case VK_VE_HI32:
return VE::fixup_ve_hi32;
case VK_VE_LO32:
return VE::fixup_ve_lo32;
case VK_VE_PC_HI32:
return VE::fixup_ve_pc_hi32;
case VK_VE_PC_LO32:
return VE::fixup_ve_pc_lo32;
case VK_VE_GOT_HI32:
return VE::fixup_ve_got_hi32;
case VK_VE_GOT_LO32:
return VE::fixup_ve_got_lo32;
case VK_VE_GOTOFF_HI32:
return VE::fixup_ve_gotoff_hi32;
case VK_VE_GOTOFF_LO32:
return VE::fixup_ve_gotoff_lo32;
case VK_VE_PLT_HI32:
return VE::fixup_ve_plt_hi32;
case VK_VE_PLT_LO32:
return VE::fixup_ve_plt_lo32;
case VK_VE_TLS_GD_HI32:
return VE::fixup_ve_tls_gd_hi32;
case VK_VE_TLS_GD_LO32:
return VE::fixup_ve_tls_gd_lo32;
case VK_VE_TPOFF_HI32:
return VE::fixup_ve_tpoff_hi32;
case VK_VE_TPOFF_LO32:
return VE::fixup_ve_tpoff_lo32;
}
}
bool VEMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout,
const MCFixup *Fixup) const {
if (!getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup))
return false;
Res =
MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(), getKind());
return true;
}
static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
switch (Expr->getKind()) {
case MCExpr::Target:
llvm_unreachable("Can't handle nested target expr!");
break;
case MCExpr::Constant:
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;
}
case MCExpr::Unary:
fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
break;
}
}
void VEMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
void VEMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
switch (getKind()) {
default:
return;
case VK_VE_TLS_GD_HI32:
case VK_VE_TLS_GD_LO32:
case VK_VE_TPOFF_HI32:
case VK_VE_TPOFF_LO32:
break;
}
fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
}
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