304 lines
7.9 KiB
C++
304 lines
7.9 KiB
C++
//===-- MipsMCExpr.cpp - Mips specific MC expression classes --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "MipsMCExpr.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/MC/MCAsmInfo.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/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstdint>
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using namespace llvm;
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#define DEBUG_TYPE "mipsmcexpr"
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const MipsMCExpr *MipsMCExpr::create(MipsMCExpr::MipsExprKind Kind,
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const MCExpr *Expr, MCContext &Ctx) {
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return new (Ctx) MipsMCExpr(Kind, Expr);
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}
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const MipsMCExpr *MipsMCExpr::createGpOff(MipsMCExpr::MipsExprKind Kind,
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const MCExpr *Expr, MCContext &Ctx) {
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return create(Kind, create(MEK_NEG, create(MEK_GPREL, Expr, Ctx), Ctx), Ctx);
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}
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void MipsMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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int64_t AbsVal;
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switch (Kind) {
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case MEK_None:
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case MEK_Special:
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llvm_unreachable("MEK_None and MEK_Special are invalid");
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break;
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case MEK_DTPREL:
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// MEK_DTPREL is used for marking TLS DIEExpr only
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// and contains a regular sub-expression.
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getSubExpr()->print(OS, MAI, true);
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return;
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case MEK_CALL_HI16:
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OS << "%call_hi";
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break;
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case MEK_CALL_LO16:
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OS << "%call_lo";
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break;
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case MEK_DTPREL_HI:
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OS << "%dtprel_hi";
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break;
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case MEK_DTPREL_LO:
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OS << "%dtprel_lo";
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break;
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case MEK_GOT:
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OS << "%got";
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break;
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case MEK_GOTTPREL:
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OS << "%gottprel";
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break;
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case MEK_GOT_CALL:
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OS << "%call16";
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break;
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case MEK_GOT_DISP:
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OS << "%got_disp";
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break;
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case MEK_GOT_HI16:
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OS << "%got_hi";
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break;
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case MEK_GOT_LO16:
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OS << "%got_lo";
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break;
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case MEK_GOT_PAGE:
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OS << "%got_page";
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break;
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case MEK_GOT_OFST:
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OS << "%got_ofst";
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break;
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case MEK_GPREL:
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OS << "%gp_rel";
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break;
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case MEK_HI:
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OS << "%hi";
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break;
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case MEK_HIGHER:
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OS << "%higher";
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break;
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case MEK_HIGHEST:
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OS << "%highest";
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break;
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case MEK_LO:
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OS << "%lo";
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break;
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case MEK_NEG:
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OS << "%neg";
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break;
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case MEK_PCREL_HI16:
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OS << "%pcrel_hi";
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break;
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case MEK_PCREL_LO16:
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OS << "%pcrel_lo";
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break;
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case MEK_TLSGD:
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OS << "%tlsgd";
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break;
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case MEK_TLSLDM:
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OS << "%tlsldm";
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break;
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case MEK_TPREL_HI:
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OS << "%tprel_hi";
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break;
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case MEK_TPREL_LO:
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OS << "%tprel_lo";
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break;
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}
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OS << '(';
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if (Expr->evaluateAsAbsolute(AbsVal))
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OS << AbsVal;
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else
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Expr->print(OS, MAI, true);
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OS << ')';
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}
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bool
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MipsMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout,
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const MCFixup *Fixup) const {
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// Look for the %hi(%neg(%gp_rel(X))) and %lo(%neg(%gp_rel(X))) special cases.
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if (isGpOff()) {
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const MCExpr *SubExpr =
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cast<MipsMCExpr>(cast<MipsMCExpr>(getSubExpr())->getSubExpr())
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->getSubExpr();
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if (!SubExpr->evaluateAsRelocatable(Res, Layout, Fixup))
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return false;
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Res = MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(),
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MEK_Special);
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return true;
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}
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if (!getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup))
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return false;
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if (Res.getRefKind() != MCSymbolRefExpr::VK_None)
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return false;
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// evaluateAsAbsolute() and evaluateAsValue() require that we evaluate the
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// %hi/%lo/etc. here. Fixup is a null pointer when either of these is the
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// caller.
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if (Res.isAbsolute() && Fixup == nullptr) {
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int64_t AbsVal = Res.getConstant();
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switch (Kind) {
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case MEK_None:
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case MEK_Special:
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llvm_unreachable("MEK_None and MEK_Special are invalid");
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case MEK_DTPREL:
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// MEK_DTPREL is used for marking TLS DIEExpr only
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// and contains a regular sub-expression.
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return getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup);
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case MEK_DTPREL_HI:
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case MEK_DTPREL_LO:
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case MEK_GOT:
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case MEK_GOTTPREL:
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case MEK_GOT_CALL:
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case MEK_GOT_DISP:
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case MEK_GOT_HI16:
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case MEK_GOT_LO16:
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case MEK_GOT_OFST:
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case MEK_GOT_PAGE:
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case MEK_GPREL:
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case MEK_PCREL_HI16:
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case MEK_PCREL_LO16:
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case MEK_TLSGD:
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case MEK_TLSLDM:
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case MEK_TPREL_HI:
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case MEK_TPREL_LO:
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return false;
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case MEK_LO:
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case MEK_CALL_LO16:
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AbsVal = SignExtend64<16>(AbsVal);
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break;
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case MEK_CALL_HI16:
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case MEK_HI:
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AbsVal = SignExtend64<16>((AbsVal + 0x8000) >> 16);
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break;
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case MEK_HIGHER:
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AbsVal = SignExtend64<16>((AbsVal + 0x80008000LL) >> 32);
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break;
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case MEK_HIGHEST:
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AbsVal = SignExtend64<16>((AbsVal + 0x800080008000LL) >> 48);
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break;
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case MEK_NEG:
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AbsVal = -AbsVal;
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break;
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}
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Res = MCValue::get(AbsVal);
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return true;
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}
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// We want to defer it for relocatable expressions since the constant is
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// applied to the whole symbol value.
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//
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// The value of getKind() that is given to MCValue is only intended to aid
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// debugging when inspecting MCValue objects. It shouldn't be relied upon
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// for decision making.
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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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void MipsMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
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Streamer.visitUsedExpr(*getSubExpr());
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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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fixELFSymbolsInTLSFixupsImpl(cast<MipsMCExpr>(Expr)->getSubExpr(), Asm);
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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 MipsMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
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switch (getKind()) {
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case MEK_None:
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case MEK_Special:
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llvm_unreachable("MEK_None and MEK_Special are invalid");
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break;
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case MEK_CALL_HI16:
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case MEK_CALL_LO16:
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case MEK_GOT:
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case MEK_GOT_CALL:
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case MEK_GOT_DISP:
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case MEK_GOT_HI16:
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case MEK_GOT_LO16:
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case MEK_GOT_OFST:
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case MEK_GOT_PAGE:
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case MEK_GPREL:
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case MEK_HI:
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case MEK_HIGHER:
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case MEK_HIGHEST:
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case MEK_LO:
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case MEK_NEG:
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case MEK_PCREL_HI16:
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case MEK_PCREL_LO16:
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// If we do have nested target-specific expressions, they will be in
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// a consecutive chain.
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if (const MipsMCExpr *E = dyn_cast<const MipsMCExpr>(getSubExpr()))
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E->fixELFSymbolsInTLSFixups(Asm);
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break;
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case MEK_DTPREL:
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case MEK_DTPREL_HI:
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case MEK_DTPREL_LO:
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case MEK_TLSLDM:
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case MEK_TLSGD:
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case MEK_GOTTPREL:
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case MEK_TPREL_HI:
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case MEK_TPREL_LO:
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fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
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break;
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}
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}
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bool MipsMCExpr::isGpOff(MipsExprKind &Kind) const {
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if (getKind() == MEK_HI || getKind() == MEK_LO) {
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if (const MipsMCExpr *S1 = dyn_cast<const MipsMCExpr>(getSubExpr())) {
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if (const MipsMCExpr *S2 = dyn_cast<const MipsMCExpr>(S1->getSubExpr())) {
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if (S1->getKind() == MEK_NEG && S2->getKind() == MEK_GPREL) {
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Kind = getKind();
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return true;
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}
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}
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}
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}
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return false;
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}
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