2009-08-14 11:41:23 +08:00
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//===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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2017-06-06 19:49:48 +08:00
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#include "llvm/MC/MCSymbol.h"
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2017-02-09 06:23:19 +08:00
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#include "llvm/ADT/StringRef.h"
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2015-06-09 08:31:39 +08:00
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#include "llvm/MC/MCAsmInfo.h"
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2015-06-10 02:36:13 +08:00
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#include "llvm/MC/MCContext.h"
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2010-05-06 03:00:56 +08:00
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#include "llvm/MC/MCExpr.h"
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2017-02-09 06:23:19 +08:00
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#include "llvm/MC/MCFragment.h"
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#include "llvm/Support/Compiler.h"
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2010-01-05 09:28:10 +08:00
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#include "llvm/Support/Debug.h"
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2015-06-09 08:31:39 +08:00
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#include "llvm/Support/ErrorHandling.h"
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2009-08-14 11:41:23 +08:00
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#include "llvm/Support/raw_ostream.h"
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2017-02-09 06:23:19 +08:00
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#include <cassert>
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#include <cstddef>
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2009-08-14 11:41:23 +08:00
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using namespace llvm;
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2015-12-29 17:32:18 +08:00
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// Only the address of this fragment is ever actually used.
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static MCDummyFragment SentinelFragment(nullptr);
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2015-10-05 20:07:05 +08:00
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// Sentinel value for the absolute pseudo fragment.
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2015-12-29 17:32:18 +08:00
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MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment;
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2009-08-22 15:22:36 +08:00
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2015-06-10 03:56:05 +08:00
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void *MCSymbol::operator new(size_t s, const StringMapEntry<bool> *Name,
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MCContext &Ctx) {
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// We may need more space for a Name to account for alignment. So allocate
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// space for the storage type and not the name pointer.
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size_t Size = s + (Name ? sizeof(NameEntryStorageTy) : 0);
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2015-06-10 02:36:13 +08:00
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// For safety, ensure that the alignment of a pointer is enough for an
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// MCSymbol. This also ensures we don't need padding between the name and
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// symbol.
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2016-10-20 23:02:18 +08:00
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static_assert((unsigned)alignof(MCSymbol) <= alignof(NameEntryStorageTy),
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2015-06-10 04:58:03 +08:00
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"Bad alignment of MCSymbol");
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2016-10-20 23:02:18 +08:00
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void *Storage = Ctx.allocate(Size, alignof(NameEntryStorageTy));
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2015-06-10 03:56:05 +08:00
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NameEntryStorageTy *Start = static_cast<NameEntryStorageTy*>(Storage);
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NameEntryStorageTy *End = Start + (Name ? 1 : 0);
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2015-06-10 02:36:13 +08:00
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return End;
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}
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2010-05-06 03:00:56 +08:00
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void MCSymbol::setVariableValue(const MCExpr *Value) {
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2010-11-15 22:40:36 +08:00
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assert(!IsUsed && "Cannot set a variable that has already been used.");
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2010-05-06 03:00:56 +08:00
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assert(Value && "Invalid variable value!");
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2015-06-23 03:57:33 +08:00
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assert((SymbolContents == SymContentsUnset ||
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SymbolContents == SymContentsVariable) &&
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"Cannot give common/offset symbol a variable value");
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2010-05-06 03:00:56 +08:00
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this->Value = Value;
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2015-06-23 03:57:33 +08:00
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SymbolContents = SymContentsVariable;
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2015-07-01 04:54:21 +08:00
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setUndefined();
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2010-05-06 03:00:56 +08:00
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}
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2015-06-09 08:31:39 +08:00
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void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
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2010-01-18 03:23:46 +08:00
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// The name for this MCSymbol is required to be a valid target name. However,
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// some targets support quoting names with funny characters. If the name
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// contains a funny character, then print it quoted.
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2013-11-14 14:05:49 +08:00
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StringRef Name = getName();
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2015-06-09 08:31:39 +08:00
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if (!MAI || MAI->isValidUnquotedName(Name)) {
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OS << Name;
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2009-09-14 02:04:46 +08:00
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return;
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}
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2012-05-11 09:41:30 +08:00
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2015-06-09 08:31:39 +08:00
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if (MAI && !MAI->supportsNameQuoting())
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report_fatal_error("Symbol name with unsupported characters");
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2013-11-14 14:05:49 +08:00
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OS << '"';
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2015-06-09 08:31:39 +08:00
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for (char C : Name) {
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if (C == '\n')
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OS << "\\n";
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else if (C == '"')
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OS << "\\\"";
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else
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OS << C;
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}
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OS << '"';
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2009-08-14 11:41:23 +08:00
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}
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2017-01-28 10:02:38 +08:00
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void MCSymbol::dump() const {
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dbgs() << *this;
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}
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#endif
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