| //===-- 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 MCFixup *Fixup) const { |
| return getSubExpr()->EvaluateAsRelocatable(Res, Layout, Fixup); |
| } |
| |
| void MipsMCExpr::visitUsedExpr(MCStreamer &Streamer) const { |
| Streamer.visitUsedExpr(*getSubExpr()); |
| } |