Line data    Source code

       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/ADT/StringRef.h"
      12             : #include "llvm/Config/llvm-config.h"
      13             : #include "llvm/MC/MCAsmInfo.h"
      14             : #include "llvm/MC/MCContext.h"
      15             : #include "llvm/MC/MCExpr.h"
      16             : #include "llvm/MC/MCFragment.h"
      17             : #include "llvm/Support/Compiler.h"
      18             : #include "llvm/Support/Debug.h"
      19             : #include "llvm/Support/ErrorHandling.h"
      20             : #include "llvm/Support/raw_ostream.h"
      21             : #include <cassert>
      22             : #include <cstddef>
      23             : 
      24             : using namespace llvm;
      25             : 
      26             : // Only the address of this fragment is ever actually used.
      27             : static MCDummyFragment SentinelFragment(nullptr);
      28             : 
      29             : // Sentinel value for the absolute pseudo fragment.
      30             : MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment;
      31             : 
      32    11212811 : void *MCSymbol::operator new(size_t s, const StringMapEntry<bool> *Name,
      33             :                              MCContext &Ctx) {
      34             :   // We may need more space for a Name to account for alignment.  So allocate
      35             :   // space for the storage type and not the name pointer.
      36    16312563 :   size_t Size = s + (Name ? sizeof(NameEntryStorageTy) : 0);
      37             : 
      38             :   // For safety, ensure that the alignment of a pointer is enough for an
      39             :   // MCSymbol.  This also ensures we don't need padding between the name and
      40             :   // symbol.
      41             :   static_assert((unsigned)alignof(MCSymbol) <= alignof(NameEntryStorageTy),
      42             :                 "Bad alignment of MCSymbol");
      43             :   void *Storage = Ctx.allocate(Size, alignof(NameEntryStorageTy));
      44             :   NameEntryStorageTy *Start = static_cast<NameEntryStorageTy*>(Storage);
      45    11212812 :   NameEntryStorageTy *End = Start + (Name ? 1 : 0);
      46    11212812 :   return End;
      47             : }
      48             : 
      49       11253 : void MCSymbol::setVariableValue(const MCExpr *Value) {
      50             :   assert(!IsUsed && "Cannot set a variable that has already been used.");
      51             :   assert(Value && "Invalid variable value!");
      52             :   assert((SymbolContents == SymContentsUnset ||
      53             :           SymbolContents == SymContentsVariable) &&
      54             :          "Cannot give common/offset symbol a variable value");
      55       11253 :   this->Value = Value;
      56       11253 :   SymbolContents = SymContentsVariable;
      57             :   setUndefined();
      58       11253 : }
      59             : 
      60     1568149 : void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
      61             :   // The name for this MCSymbol is required to be a valid target name.  However,
      62             :   // some targets support quoting names with funny characters.  If the name
      63             :   // contains a funny character, then print it quoted.
      64             :   StringRef Name = getName();
      65     1568149 :   if (!MAI || MAI->isValidUnquotedName(Name)) {
      66     1565260 :     OS << Name;
      67             :     return;
      68             :   }
      69             : 
      70        2889 :   if (MAI && !MAI->supportsNameQuoting())
      71           0 :     report_fatal_error("Symbol name with unsupported characters");
      72             : 
      73             :   OS << '"';
      74       63040 :   for (char C : Name) {
      75       60151 :     if (C == '\n')
      76           4 :       OS << "\\n";
      77       60147 :     else if (C == '"')
      78           4 :       OS << "\\\"";
      79             :     else
      80             :       OS << C;
      81             :   }
      82             :   OS << '"';
      83             : }
      84             : 
      85             : #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
      86             : LLVM_DUMP_METHOD void MCSymbol::dump() const {
      87             :   dbgs() << *this;
      88             : }
      89             : #endif