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//===-- CSKYMCExpr.cpp - CSKY specific MC expression classes -*- C++ -*----===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "CSKYMCExpr.h"
#include "CSKYFixupKinds.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbolELF.h"
using namespace llvm;
#define DEBUG_TYPE "csky-mc-expr"
const CSKYMCExpr *CSKYMCExpr::create(const MCExpr *Expr, VariantKind Kind,
MCContext &Ctx) {
return new (Ctx) CSKYMCExpr(Kind, Expr);
}
StringRef CSKYMCExpr::getVariantKindName(VariantKind Kind) {
switch (Kind) {
default:
llvm_unreachable("Invalid ELF symbol kind");
case VK_CSKY_ADDR:
return "";
case VK_CSKY_PCREL:
return "";
case VK_CSKY_GOT:
return "@GOT";
case VK_CSKY_GOTPC:
return "@GOTPC";
case VK_CSKY_GOTOFF:
return "@GOTOFF";
case VK_CSKY_PLT:
return "@PLT";
case VK_CSKY_TPOFF:
return "@TPOFF";
case VK_CSKY_TLSGD:
return "@TLSGD";
}
}
void CSKYMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
void CSKYMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
Expr->print(OS, MAI);
OS << getVariantKindName(getKind());
}
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::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 CSKYMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
switch (getKind()) {
default:
return;
case VK_CSKY_TPOFF:
case VK_CSKY_TLSGD:
break;
}
fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
}
bool CSKYMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout,
const MCFixup *Fixup) const {
if (!getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup))
return false;
// Some custom fixup types are not valid with symbol difference expressions
if (Res.getSymA() && Res.getSymB()) {
switch (getKind()) {
default:
return true;
case VK_CSKY_ADDR:
case VK_CSKY_PCREL:
case VK_CSKY_GOT:
case VK_CSKY_GOTPC:
case VK_CSKY_GOTOFF:
case VK_CSKY_TPOFF:
case VK_CSKY_TLSGD:
return false;
}
}
return true;
}
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