190778a8ba
The names "SymbolContents" and "SymContents*" members are confusing. Rename to kind and Kind::XXX similar to lld/ELF/Symbols.h Rename SymContentsVariable to Kind::Equated as the former term is "equated symbol", not "variable".
91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
//===- lib/MC/MCSymbol.cpp - MCSymbol implementation ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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#include <cstddef>
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using namespace llvm;
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// There are numerous MCSymbol objects, so keeping sizeof(MCSymbol) small is
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// crucial for minimizing peak memory usage.
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static_assert(sizeof(MCSymbol) <= 24, "Keep the base symbol small");
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// Only the address of this fragment is ever actually used.
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static MCFragment SentinelFragment;
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// Sentinel value for the absolute pseudo fragment.
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MCFragment *MCSymbol::AbsolutePseudoFragment = &SentinelFragment;
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void *MCSymbol::operator new(size_t s, const MCSymbolTableEntry *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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// 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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static_assert((unsigned)alignof(MCSymbol) <= alignof(NameEntryStorageTy),
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"Bad alignment of MCSymbol");
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void *Storage = Ctx.allocate(Size, alignof(NameEntryStorageTy));
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NameEntryStorageTy *Start = static_cast<NameEntryStorageTy*>(Storage);
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NameEntryStorageTy *End = Start + (Name ? 1 : 0);
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return End;
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}
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void MCSymbol::setVariableValue(const MCExpr *Value) {
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assert(Value && "Invalid equated expression");
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assert((kind == Kind::Regular || kind == Kind::Equated) &&
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"Cannot equate a common symbol");
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this->Value = Value;
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kind = Kind::Equated;
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setUndefined();
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}
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void MCSymbol::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
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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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StringRef Name = getName();
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if (!MAI || MAI->isValidUnquotedName(Name)) {
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OS << Name;
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return;
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}
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if (MAI && !MAI->supportsNameQuoting())
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report_fatal_error("Symbol name with unsupported characters");
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OS << '"';
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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 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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}
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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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