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