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