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//===-- PPCMCExpr.cpp - PPC specific MC expression classes ----------------===//
//
// 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 "PPCMCExpr.h"
#include "PPCFixupKinds.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectStreamer.h"
using namespace llvm;
#define DEBUG_TYPE "ppcmcexpr"
const PPCMCExpr *PPCMCExpr::create(VariantKind Kind, const MCExpr *Expr,
MCContext &Ctx) {
return new (Ctx) PPCMCExpr(Kind, Expr);
}
void PPCMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
getSubExpr()->print(OS, MAI);
switch (Kind) {
default:
llvm_unreachable("Invalid kind!");
case VK_PPC_LO:
OS << "@l";
break;
case VK_PPC_HI:
OS << "@h";
break;
case VK_PPC_HA:
OS << "@ha";
break;
case VK_PPC_HIGH:
OS << "@high";
break;
case VK_PPC_HIGHA:
OS << "@higha";
break;
case VK_PPC_HIGHER:
OS << "@higher";
break;
case VK_PPC_HIGHERA:
OS << "@highera";
break;
case VK_PPC_HIGHEST:
OS << "@highest";
break;
case VK_PPC_HIGHESTA:
OS << "@highesta";
break;
}
}
bool
PPCMCExpr::evaluateAsConstant(int64_t &Res) const {
MCValue Value;
if (!getSubExpr()->evaluateAsRelocatable(Value, nullptr, nullptr))
return false;
if (!Value.isAbsolute())
return false;
Res = evaluateAsInt64(Value.getConstant());
return true;
}
int64_t
PPCMCExpr::evaluateAsInt64(int64_t Value) const {
switch (Kind) {
case VK_PPC_LO:
return Value & 0xffff;
case VK_PPC_HI:
return (Value >> 16) & 0xffff;
case VK_PPC_HA:
return ((Value + 0x8000) >> 16) & 0xffff;
case VK_PPC_HIGH:
return (Value >> 16) & 0xffff;
case VK_PPC_HIGHA:
return ((Value + 0x8000) >> 16) & 0xffff;
case VK_PPC_HIGHER:
return (Value >> 32) & 0xffff;
case VK_PPC_HIGHERA:
return ((Value + 0x8000) >> 32) & 0xffff;
case VK_PPC_HIGHEST:
return (Value >> 48) & 0xffff;
case VK_PPC_HIGHESTA:
return ((Value + 0x8000) >> 48) & 0xffff;
case VK_PPC_None:
break;
}
llvm_unreachable("Invalid kind!");
}
bool
PPCMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout,
const MCFixup *Fixup) const {
MCValue Value;
if (!getSubExpr()->evaluateAsRelocatable(Value, Layout, Fixup))
return false;
if (Value.isAbsolute()) {
int64_t Result = evaluateAsInt64(Value.getConstant());
bool IsHalf16 = Fixup && Fixup->getTargetKind() == PPC::fixup_ppc_half16;
bool IsHalf16DS =
Fixup && Fixup->getTargetKind() == PPC::fixup_ppc_half16ds;
bool IsHalf16DQ =
Fixup && Fixup->getTargetKind() == PPC::fixup_ppc_half16dq;
bool IsHalf = IsHalf16 || IsHalf16DS || IsHalf16DQ;
if (!IsHalf && Result >= 0x8000)
return false;
if ((IsHalf16DS && (Result & 0x3)) || (IsHalf16DQ && (Result & 0xf)))
return false;
Res = MCValue::get(Result);
} else {
if (!Layout)
return false;
MCContext &Context = Layout->getAssembler().getContext();
const MCSymbolRefExpr *Sym = Value.getSymA();
MCSymbolRefExpr::VariantKind Modifier = Sym->getKind();
if (Modifier != MCSymbolRefExpr::VK_None)
return false;
switch (Kind) {
default:
llvm_unreachable("Invalid kind!");
case VK_PPC_LO:
Modifier = MCSymbolRefExpr::VK_PPC_LO;
break;
case VK_PPC_HI:
Modifier = MCSymbolRefExpr::VK_PPC_HI;
break;
case VK_PPC_HA:
Modifier = MCSymbolRefExpr::VK_PPC_HA;
break;
case VK_PPC_HIGH:
Modifier = MCSymbolRefExpr::VK_PPC_HIGH;
break;
case VK_PPC_HIGHA:
Modifier = MCSymbolRefExpr::VK_PPC_HIGHA;
break;
case VK_PPC_HIGHERA:
Modifier = MCSymbolRefExpr::VK_PPC_HIGHERA;
break;
case VK_PPC_HIGHER:
Modifier = MCSymbolRefExpr::VK_PPC_HIGHER;
break;
case VK_PPC_HIGHEST:
Modifier = MCSymbolRefExpr::VK_PPC_HIGHEST;
break;
case VK_PPC_HIGHESTA:
Modifier = MCSymbolRefExpr::VK_PPC_HIGHESTA;
break;
}
Sym = MCSymbolRefExpr::create(&Sym->getSymbol(), Modifier, Context);
Res = MCValue::get(Sym, Value.getSymB(), Value.getConstant());
}
return true;
}
void PPCMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
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