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      1 //===-- HexagonMCExpr.cpp - Hexagon specific MC expression classes
      2 //----------===//
      3 //
      4 //                     The LLVM Compiler Infrastructure
      5 //
      6 // This file is distributed under the University of Illinois Open Source
      7 // License. See LICENSE.TXT for details.
      8 //
      9 //===----------------------------------------------------------------------===//
     10 
     11 #include "HexagonMCExpr.h"
     12 #include "llvm/MC/MCContext.h"
     13 #include "llvm/MC/MCStreamer.h"
     14 #include "llvm/MC/MCSymbolELF.h"
     15 #include "llvm/MC/MCValue.h"
     16 #include "llvm/Object/ELF.h"
     17 #include "llvm/Support/raw_ostream.h"
     18 
     19 using namespace llvm;
     20 
     21 #define DEBUG_TYPE "hexagon-mcexpr"
     22 
     23 HexagonMCExpr *HexagonMCExpr::create(MCExpr const *Expr, MCContext &Ctx) {
     24   return new (Ctx) HexagonMCExpr(Expr);
     25 }
     26 
     27 bool HexagonMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
     28                                               MCAsmLayout const *Layout,
     29                                               MCFixup const *Fixup) const {
     30   return Expr->evaluateAsRelocatable(Res, Layout, Fixup);
     31 }
     32 
     33 void HexagonMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
     34   Streamer.visitUsedExpr(*Expr);
     35 }
     36 
     37 MCFragment *llvm::HexagonMCExpr::findAssociatedFragment() const {
     38   return Expr->findAssociatedFragment();
     39 }
     40 
     41 static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
     42   switch (Expr->getKind()) {
     43   case MCExpr::Target:
     44     llvm_unreachable("Cannot handle nested target MCExpr");
     45     break;
     46   case MCExpr::Constant:
     47     break;
     48 
     49   case MCExpr::Binary: {
     50     const MCBinaryExpr *be = cast<MCBinaryExpr>(Expr);
     51     fixELFSymbolsInTLSFixupsImpl(be->getLHS(), Asm);
     52     fixELFSymbolsInTLSFixupsImpl(be->getRHS(), Asm);
     53     break;
     54   }
     55   case MCExpr::SymbolRef: {
     56     const MCSymbolRefExpr &symRef = *cast<MCSymbolRefExpr>(Expr);
     57     switch (symRef.getKind()) {
     58     default:
     59       return;
     60     case MCSymbolRefExpr::VK_Hexagon_GD_GOT:
     61     case MCSymbolRefExpr::VK_Hexagon_LD_GOT:
     62     case MCSymbolRefExpr::VK_Hexagon_GD_PLT:
     63     case MCSymbolRefExpr::VK_Hexagon_LD_PLT:
     64     case MCSymbolRefExpr::VK_Hexagon_IE:
     65     case MCSymbolRefExpr::VK_Hexagon_IE_GOT:
     66     case MCSymbolRefExpr::VK_TPREL:
     67       break;
     68     }
     69     cast<MCSymbolELF>(symRef.getSymbol()).setType(ELF::STT_TLS);
     70     break;
     71   }
     72   case MCExpr::Unary:
     73     fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
     74     break;
     75   }
     76 }
     77 
     78 void HexagonMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
     79   auto expr = getExpr();
     80   fixELFSymbolsInTLSFixupsImpl(expr, Asm);
     81 }
     82 
     83 MCExpr const *HexagonMCExpr::getExpr() const { return Expr; }
     84 
     85 void HexagonMCExpr::setMustExtend(bool Val) {
     86   assert((!Val || !MustNotExtend) && "Extension contradiction");
     87   MustExtend = Val;
     88 }
     89 
     90 bool HexagonMCExpr::mustExtend() const { return MustExtend; }
     91 void HexagonMCExpr::setMustNotExtend(bool Val) {
     92   assert((!Val || !MustExtend) && "Extension contradiction");
     93   MustNotExtend = Val;
     94 }
     95 bool HexagonMCExpr::mustNotExtend() const { return MustNotExtend; }
     96 
     97 bool HexagonMCExpr::s27_2_reloc() const { return S27_2_reloc; }
     98 void HexagonMCExpr::setS27_2_reloc(bool Val) {
     99   S27_2_reloc = Val;
    100 }
    101 
    102 bool HexagonMCExpr::classof(MCExpr const *E) {
    103   return E->getKind() == MCExpr::Target;
    104 }
    105 
    106 HexagonMCExpr::HexagonMCExpr(MCExpr const *Expr)
    107     : Expr(Expr), MustNotExtend(false), MustExtend(false), S27_2_reloc(false),
    108       SignMismatch(false) {}
    109 
    110 void HexagonMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
    111   Expr->print(OS, MAI);
    112 }
    113 
    114 void HexagonMCExpr::setSignMismatch(bool Val) {
    115   SignMismatch = Val;
    116 }
    117 
    118 bool HexagonMCExpr::signMismatch() const {
    119   return SignMismatch;
    120 }
    121