1//===- lib/MC/MCSymbol.cpp - MCSymbol 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/MCSymbol.h" 11#include "llvm/MC/MCAsmInfo.h" 12#include "llvm/MC/MCContext.h" 13#include "llvm/MC/MCExpr.h" 14#include "llvm/Support/Debug.h" 15#include "llvm/Support/ErrorHandling.h" 16#include "llvm/Support/raw_ostream.h" 17using namespace llvm; 18 19// Only the address of this fragment is ever actually used. 20static MCDummyFragment SentinelFragment(nullptr); 21 22// Sentinel value for the absolute pseudo fragment. 23MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment; 24 25void *MCSymbol::operator new(size_t s, const StringMapEntry<bool> *Name, 26 MCContext &Ctx) { 27 // We may need more space for a Name to account for alignment. So allocate 28 // space for the storage type and not the name pointer. 29 size_t Size = s + (Name ? sizeof(NameEntryStorageTy) : 0); 30 31 // For safety, ensure that the alignment of a pointer is enough for an 32 // MCSymbol. This also ensures we don't need padding between the name and 33 // symbol. 34 static_assert((unsigned)AlignOf<MCSymbol>::Alignment <= 35 AlignOf<NameEntryStorageTy>::Alignment, 36 "Bad alignment of MCSymbol"); 37 void *Storage = Ctx.allocate(Size, alignOf<NameEntryStorageTy>()); 38 NameEntryStorageTy *Start = static_cast<NameEntryStorageTy*>(Storage); 39 NameEntryStorageTy *End = Start + (Name ? 1 : 0); 40 return End; 41} 42 43void MCSymbol::setVariableValue(const MCExpr *Value) { 44 assert(!IsUsed && "Cannot set a variable that has already been used."); 45 assert(Value && "Invalid variable value!"); 46 assert((SymbolContents == SymContentsUnset || 47 SymbolContents == SymContentsVariable) && 48 "Cannot give common/offset symbol a variable value"); 49 this->Value = Value; 50 SymbolContents = SymContentsVariable; 51 setUndefined(); 52} 53 54void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const { 55 // The name for this MCSymbol is required to be a valid target name. However, 56 // some targets support quoting names with funny characters. If the name 57 // contains a funny character, then print it quoted. 58 StringRef Name = getName(); 59 if (!MAI || MAI->isValidUnquotedName(Name)) { 60 OS << Name; 61 return; 62 } 63 64 if (MAI && !MAI->supportsNameQuoting()) 65 report_fatal_error("Symbol name with unsupported characters"); 66 67 OS << '"'; 68 for (char C : Name) { 69 if (C == '\n') 70 OS << "\\n"; 71 else if (C == '"') 72 OS << "\\\""; 73 else 74 OS << C; 75 } 76 OS << '"'; 77} 78 79#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 80void MCSymbol::dump() const { dbgs() << *this; } 81#endif 82