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//===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm_ks;
// Only the address of this fragment is ever actually used.
static MCDummyFragment SentinelFragment(nullptr);
// Sentinel value for the absolute pseudo fragment.
MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment;
void *MCSymbol::operator new(size_t s, const StringMapEntry<bool> *Name,
MCContext &Ctx) {
// We may need more space for a Name to account for alignment. So allocate
// space for the storage type and not the name pointer.
size_t Size = s + (Name ? sizeof(NameEntryStorageTy) : 0);
// For safety, ensure that the alignment of a pointer is enough for an
// MCSymbol. This also ensures we don't need padding between the name and
// symbol.
static_assert((unsigned)AlignOf<MCSymbol>::Alignment <=
AlignOf<NameEntryStorageTy>::Alignment,
"Bad alignment of MCSymbol");
void *Storage = Ctx.allocate(Size, alignOf<NameEntryStorageTy>());
NameEntryStorageTy *Start = static_cast<NameEntryStorageTy*>(Storage);
NameEntryStorageTy *End = Start + (Name ? 1 : 0);
return End;
}
void MCSymbol::setVariableValue(const MCExpr *Value, bool &valid) {
valid = true;
//assert(!IsUsed && "Cannot set a variable that has already been used.");
//assert(Value && "Invalid variable value!");
//assert((SymbolContents == SymContentsUnset ||
// SymbolContents == SymContentsVariable) &&
// "Cannot give common/offset symbol a variable value");
if (IsUsed || !Value || (SymbolContents != SymContentsUnset &&
SymbolContents != SymContentsVariable)) {
valid = false;
return;
}
this->Value = Value;
SymbolContents = SymContentsVariable;
setUndefined();
}
void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
// The name for this MCSymbol is required to be a valid target name. However,
// some targets support quoting names with funny characters. If the name
// contains a funny character, then print it quoted.
StringRef Name = getName();
if (!MAI || MAI->isValidUnquotedName(Name)) {
OS << Name;
return;
}
if (MAI && !MAI->supportsNameQuoting())
report_fatal_error("Symbol name with unsupported characters");
OS << '"';
for (char C : Name) {
if (C == '\n')
OS << "\\n";
else if (C == '"')
OS << "\\\"";
else
OS << C;
}
OS << '"';
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void MCSymbol::dump() const { }
#endif