1 //===-- ARMMCExpr.cpp - ARM specific MC expression classes ----------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #define DEBUG_TYPE "armmcexpr" 11 #include "ARMMCExpr.h" 12 #include "llvm/MC/MCContext.h" 13 #include "llvm/MC/MCAssembler.h" 14 using namespace llvm; 15 16 const ARMMCExpr* 17 ARMMCExpr::Create(VariantKind Kind, const MCExpr *Expr, 18 MCContext &Ctx) { 19 return new (Ctx) ARMMCExpr(Kind, Expr); 20 } 21 22 void ARMMCExpr::PrintImpl(raw_ostream &OS) const { 23 switch (Kind) { 24 default: assert(0 && "Invalid kind!"); 25 case VK_ARM_HI16: OS << ":upper16:"; break; 26 case VK_ARM_LO16: OS << ":lower16:"; break; 27 } 28 29 const MCExpr *Expr = getSubExpr(); 30 if (Expr->getKind() != MCExpr::SymbolRef) 31 OS << '('; 32 Expr->print(OS); 33 if (Expr->getKind() != MCExpr::SymbolRef) 34 OS << ')'; 35 } 36 37 bool 38 ARMMCExpr::EvaluateAsRelocatableImpl(MCValue &Res, 39 const MCAsmLayout *Layout) const { 40 return false; 41 } 42 43 // FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps 44 // that method should be made public? 45 static void AddValueSymbols_(const MCExpr *Value, MCAssembler *Asm) { 46 switch (Value->getKind()) { 47 case MCExpr::Target: 48 assert(0 && "Can't handle nested target expr!"); 49 break; 50 51 case MCExpr::Constant: 52 break; 53 54 case MCExpr::Binary: { 55 const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value); 56 AddValueSymbols_(BE->getLHS(), Asm); 57 AddValueSymbols_(BE->getRHS(), Asm); 58 break; 59 } 60 61 case MCExpr::SymbolRef: 62 Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol()); 63 break; 64 65 case MCExpr::Unary: 66 AddValueSymbols_(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm); 67 break; 68 } 69 } 70 71 void ARMMCExpr::AddValueSymbols(MCAssembler *Asm) const { 72 AddValueSymbols_(getSubExpr(), Asm); 73 } 74
