146 lines
5.0 KiB
C++
146 lines
5.0 KiB
C++
//===-- AArch64MCExpr.cpp - AArch64 specific MC expression classes --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the implementation of the assembly expression modifiers
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// accepted by the AArch64 architecture (e.g. ":lo12:", ":gottprel_g1:", ...).
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//
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//===----------------------------------------------------------------------===//
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#include "AArch64MCExpr.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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#define DEBUG_TYPE "aarch64symbolrefexpr"
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const AArch64MCExpr *AArch64MCExpr::create(const MCExpr *Expr, VariantKind Kind,
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MCContext &Ctx) {
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return new (Ctx) AArch64MCExpr(Expr, Kind);
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}
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StringRef AArch64MCExpr::getVariantKindName() const {
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switch (static_cast<uint32_t>(getKind())) {
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case VK_CALL: return "";
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case VK_LO12: return ":lo12:";
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case VK_ABS_G3: return ":abs_g3:";
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case VK_ABS_G2: return ":abs_g2:";
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case VK_ABS_G2_S: return ":abs_g2_s:";
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case VK_ABS_G2_NC: return ":abs_g2_nc:";
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case VK_ABS_G1: return ":abs_g1:";
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case VK_ABS_G1_S: return ":abs_g1_s:";
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case VK_ABS_G1_NC: return ":abs_g1_nc:";
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case VK_ABS_G0: return ":abs_g0:";
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case VK_ABS_G0_S: return ":abs_g0_s:";
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case VK_ABS_G0_NC: return ":abs_g0_nc:";
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case VK_DTPREL_G2: return ":dtprel_g2:";
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case VK_DTPREL_G1: return ":dtprel_g1:";
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case VK_DTPREL_G1_NC: return ":dtprel_g1_nc:";
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case VK_DTPREL_G0: return ":dtprel_g0:";
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case VK_DTPREL_G0_NC: return ":dtprel_g0_nc:";
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case VK_DTPREL_HI12: return ":dtprel_hi12:";
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case VK_DTPREL_LO12: return ":dtprel_lo12:";
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case VK_DTPREL_LO12_NC: return ":dtprel_lo12_nc:";
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case VK_TPREL_G2: return ":tprel_g2:";
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case VK_TPREL_G1: return ":tprel_g1:";
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case VK_TPREL_G1_NC: return ":tprel_g1_nc:";
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case VK_TPREL_G0: return ":tprel_g0:";
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case VK_TPREL_G0_NC: return ":tprel_g0_nc:";
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case VK_TPREL_HI12: return ":tprel_hi12:";
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case VK_TPREL_LO12: return ":tprel_lo12:";
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case VK_TPREL_LO12_NC: return ":tprel_lo12_nc:";
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case VK_TLSDESC_LO12: return ":tlsdesc_lo12:";
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case VK_ABS_PAGE: return "";
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case VK_GOT_PAGE: return ":got:";
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case VK_GOT_LO12: return ":got_lo12:";
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case VK_GOTTPREL_PAGE: return ":gottprel:";
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case VK_GOTTPREL_LO12_NC: return ":gottprel_lo12:";
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case VK_GOTTPREL_G1: return ":gottprel_g1:";
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case VK_GOTTPREL_G0_NC: return ":gottprel_g0_nc:";
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case VK_TLSDESC: return "";
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case VK_TLSDESC_PAGE: return ":tlsdesc:";
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default:
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llvm_unreachable("Invalid ELF symbol kind");
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}
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}
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void AArch64MCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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if (getKind() != VK_NONE)
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OS << getVariantKindName();
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Expr->print(OS, MAI);
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}
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void AArch64MCExpr::visitUsedExpr(MCStreamer &Streamer) const {
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Streamer.visitUsedExpr(*getSubExpr());
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}
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MCFragment *AArch64MCExpr::findAssociatedFragment() const {
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llvm_unreachable("FIXME: what goes here?");
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}
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bool AArch64MCExpr::evaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout,
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const MCFixup *Fixup) const {
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if (!getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup))
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return false;
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Res =
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MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(), getKind());
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return true;
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}
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static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
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switch (Expr->getKind()) {
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case MCExpr::Target:
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llvm_unreachable("Can't handle nested target expression");
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break;
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case MCExpr::Constant:
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break;
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case MCExpr::Binary: {
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const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
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fixELFSymbolsInTLSFixupsImpl(BE->getLHS(), Asm);
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fixELFSymbolsInTLSFixupsImpl(BE->getRHS(), Asm);
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break;
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}
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case MCExpr::SymbolRef: {
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// We're known to be under a TLS fixup, so any symbol should be
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// modified. There should be only one.
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const MCSymbolRefExpr &SymRef = *cast<MCSymbolRefExpr>(Expr);
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cast<MCSymbolELF>(SymRef.getSymbol()).setType(ELF::STT_TLS);
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break;
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}
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case MCExpr::Unary:
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fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
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break;
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}
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}
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void AArch64MCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
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switch (getSymbolLoc(Kind)) {
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default:
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return;
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case VK_DTPREL:
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case VK_GOTTPREL:
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case VK_TPREL:
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case VK_TLSDESC:
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break;
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}
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fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
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}
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