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//===-- ARM64MCExpr.cpp - ARM64 specific MC expression classes --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the implementation of the assembly expression modifiers
// accepted by the AArch64 architecture (e.g. ":lo12:", ":gottprel_g1:", ...).
//
//===----------------------------------------------------------------------===//
#include "ARM64MCExpr.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Object/ELF.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
#define DEBUG_TYPE "aarch64symbolrefexpr"
const ARM64MCExpr *ARM64MCExpr::Create(const MCExpr *Expr, VariantKind Kind,
MCContext &Ctx) {
return new (Ctx) ARM64MCExpr(Expr, Kind);
}
StringRef ARM64MCExpr::getVariantKindName() const {
switch (static_cast<uint32_t>(getKind())) {
case VK_CALL: return "";
case VK_LO12: return ":lo12:";
case VK_ABS_G3: return ":abs_g3:";
case VK_ABS_G2: return ":abs_g2:";
case VK_ABS_G2_S: return ":abs_g2_s:";
case VK_ABS_G2_NC: return ":abs_g2_nc:";
case VK_ABS_G1: return ":abs_g1:";
case VK_ABS_G1_S: return ":abs_g1_s:";
case VK_ABS_G1_NC: return ":abs_g1_nc:";
case VK_ABS_G0: return ":abs_g0:";
case VK_ABS_G0_S: return ":abs_g0_s:";
case VK_ABS_G0_NC: return ":abs_g0_nc:";
case VK_DTPREL_G2: return ":dtprel_g2:";
case VK_DTPREL_G1: return ":dtprel_g1:";
case VK_DTPREL_G1_NC: return ":dtprel_g1_nc:";
case VK_DTPREL_G0: return ":dtprel_g0:";
case VK_DTPREL_G0_NC: return ":dtprel_g0_nc:";
case VK_DTPREL_HI12: return ":dtprel_hi12:";
case VK_DTPREL_LO12: return ":dtprel_lo12:";
case VK_DTPREL_LO12_NC: return ":dtprel_lo12_nc:";
case VK_TPREL_G2: return ":tprel_g2:";
case VK_TPREL_G1: return ":tprel_g1:";
case VK_TPREL_G1_NC: return ":tprel_g1_nc:";
case VK_TPREL_G0: return ":tprel_g0:";
case VK_TPREL_G0_NC: return ":tprel_g0_nc:";
case VK_TPREL_HI12: return ":tprel_hi12:";
case VK_TPREL_LO12: return ":tprel_lo12:";
case VK_TPREL_LO12_NC: return ":tprel_lo12_nc:";
case VK_TLSDESC_LO12: return ":tlsdesc_lo12:";
case VK_ABS_PAGE: return "";
case VK_GOT_PAGE: return ":got:";
case VK_GOT_LO12: return ":got_lo12:";
case VK_GOTTPREL_PAGE: return ":gottprel:";
case VK_GOTTPREL_LO12_NC: return ":gottprel_lo12:";
case VK_GOTTPREL_G1: return ":gottprel_g1:";
case VK_GOTTPREL_G0_NC: return ":gottprel_g0_nc:";
case VK_TLSDESC: return "";
case VK_TLSDESC_PAGE: return ":tlsdesc:";
default:
llvm_unreachable("Invalid ELF symbol kind");
}
}
void ARM64MCExpr::PrintImpl(raw_ostream &OS) const {
if (getKind() != VK_NONE)
OS << getVariantKindName();
OS << *Expr;
}
// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
// that method should be made public?
// FIXME: really do above: now that two backends are using it.
static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
switch (Value->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>(Value);
AddValueSymbolsImpl(BE->getLHS(), Asm);
AddValueSymbolsImpl(BE->getRHS(), Asm);
break;
}
case MCExpr::SymbolRef:
Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
break;
case MCExpr::Unary:
AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
break;
}
}
void ARM64MCExpr::AddValueSymbols(MCAssembler *Asm) const {
AddValueSymbolsImpl(getSubExpr(), Asm);
}
const MCSection *ARM64MCExpr::FindAssociatedSection() const {
llvm_unreachable("FIXME: what goes here?");
}
bool ARM64MCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout) const {
if (!getSubExpr()->EvaluateAsRelocatable(Res, Layout))
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 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);
MCSymbolData &SD = Asm.getOrCreateSymbolData(SymRef.getSymbol());
MCELF::SetType(SD, ELF::STT_TLS);
break;
}
case MCExpr::Unary:
fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
break;
}
}
void ARM64MCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
switch (getSymbolLoc(Kind)) {
default:
return;
case VK_DTPREL:
case VK_GOTTPREL:
case VK_TPREL:
case VK_TLSDESC:
break;
}
fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
}
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