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f77ca9f85f
Given that alignments are always powers of 2, just encode it this way. This matches how we encode alignment on IR GlobalValue's for example. This compresses the CommonAlign member down to 5 bits which allows it to pack better with the surrounding fields. Reviewed by Duncan Exon Smith. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241189 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
//===- 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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#include "llvm/MC/MCSymbol.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/MC/MCExpr.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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using namespace llvm;
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// Sentinel value for the absolute pseudo section.
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MCSection *MCSymbol::AbsolutePseudoSection = reinterpret_cast<MCSection *>(1);
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const unsigned MCSymbol::NumCommonAlignmentBits;
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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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// 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>::Alignment <=
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AlignOf<NameEntryStorageTy>::Alignment,
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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(!IsUsed && "Cannot set a variable that has already been used.");
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assert(Value && "Invalid variable value!");
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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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this->Value = Value;
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SymbolContents = SymContentsVariable;
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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
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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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void MCSymbol::dump() const { dbgs() << *this; }
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#endif
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