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//===-- 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/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectStreamer.h"
using namespace llvm;
#define DEBUG_TYPE "mipsmcexpr"
bool MipsMCExpr::isSupportedBinaryExpr(MCSymbolRefExpr::VariantKind VK,
const MCBinaryExpr *BE) {
switch (VK) {
case MCSymbolRefExpr::VK_Mips_ABS_LO:
case MCSymbolRefExpr::VK_Mips_ABS_HI:
case MCSymbolRefExpr::VK_Mips_HIGHER:
case MCSymbolRefExpr::VK_Mips_HIGHEST:
break;
default:
return false;
}
// We support expressions of the form "(sym1 binop1 sym2) binop2 const",
// where "binop2 const" is optional.
if (isa<MCBinaryExpr>(BE->getLHS())) {
if (!isa<MCConstantExpr>(BE->getRHS()))
return false;
BE = cast<MCBinaryExpr>(BE->getLHS());
}
return (isa<MCSymbolRefExpr>(BE->getLHS())
&& isa<MCSymbolRefExpr>(BE->getRHS()));
}
const MipsMCExpr*
MipsMCExpr::Create(MCSymbolRefExpr::VariantKind VK, const MCExpr *Expr,
MCContext &Ctx) {
VariantKind Kind;
switch (VK) {
case MCSymbolRefExpr::VK_Mips_ABS_LO:
Kind = VK_Mips_LO;
break;
case MCSymbolRefExpr::VK_Mips_ABS_HI:
Kind = VK_Mips_HI;
break;
case MCSymbolRefExpr::VK_Mips_HIGHER:
Kind = VK_Mips_HIGHER;
break;
case MCSymbolRefExpr::VK_Mips_HIGHEST:
Kind = VK_Mips_HIGHEST;
break;
default:
llvm_unreachable("Invalid kind!");
}
return new (Ctx) MipsMCExpr(Kind, Expr);
}
void MipsMCExpr::PrintImpl(raw_ostream &OS) const {
switch (Kind) {
default: llvm_unreachable("Invalid kind!");
case VK_Mips_LO: OS << "%lo"; break;
case VK_Mips_HI: OS << "%hi"; break;
case VK_Mips_HIGHER: OS << "%higher"; break;
case VK_Mips_HIGHEST: OS << "%highest"; break;
}
OS << '(';
Expr->print(OS);
OS << ')';
}
bool
MipsMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout) const {
return getSubExpr()->EvaluateAsRelocatable(Res, Layout);
}
void MipsMCExpr::visitUsedExpr(MCObjectStreamer &Streamer) const {
Streamer.visitUsedExpr(*getSubExpr());
}
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