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https://github.com/c64scene-ar/llvm-6502.git
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8b4b91acd8
This is a reapplication of r239440 which was reverted in r239441. There are no changes to this patch from then, but this had instead exposed a bug in .thumb_set which was fixed in r240318. Having fixed that bug, it is now safe to re-apply this code. Original commit message below: It wasn't possible to have a variable Symbol with offset or 'isCommon' so this just enables better packing of the MCSymbol class. Reviewed by Rafael Espindola. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240320 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
2.7 KiB
C++
79 lines
2.7 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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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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SectionOrFragment = nullptr;
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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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