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      1 //===- lib/MC/MCValue.cpp - MCValue implementation ------------------------===//
      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 #include "llvm/MC/MCValue.h"
     11 #include "llvm/MC/MCExpr.h"
     12 #include "llvm/Support/Debug.h"
     13 #include "llvm/Support/ErrorHandling.h"
     14 #include "llvm/Support/raw_ostream.h"
     15 
     16 using namespace llvm;
     17 
     18 void MCValue::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
     19   if (isAbsolute()) {
     20     OS << getConstant();
     21     return;
     22   }
     23 
     24   // FIXME: prints as a number, which isn't ideal. But the meaning will be
     25   // target-specific anyway.
     26   if (getRefKind())
     27     OS << ':' << getRefKind() <<  ':';
     28 
     29   getSymA()->print(OS);
     30 
     31   if (getSymB()) {
     32     OS << " - ";
     33     getSymB()->print(OS);
     34   }
     35 
     36   if (getConstant())
     37     OS << " + " << getConstant();
     38 }
     39 
     40 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
     41 void MCValue::dump() const {
     42   print(dbgs(), nullptr);
     43 }
     44 #endif
     45 
     46 MCSymbolRefExpr::VariantKind MCValue::getAccessVariant() const {
     47   const MCSymbolRefExpr *B = getSymB();
     48   if (B) {
     49     if (B->getKind() != MCSymbolRefExpr::VK_None)
     50       llvm_unreachable("unsupported");
     51   }
     52 
     53   const MCSymbolRefExpr *A = getSymA();
     54   if (!A)
     55     return MCSymbolRefExpr::VK_None;
     56 
     57   MCSymbolRefExpr::VariantKind Kind = A->getKind();
     58   if (Kind == MCSymbolRefExpr::VK_WEAKREF)
     59     return MCSymbolRefExpr::VK_None;
     60   return Kind;
     61 }
     62