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https://github.com/c64scene-ar/llvm-6502.git
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8906ff1b9d
(external was really undefined and there wasn't an explicit representation for absolute symbols). - This still needs some cleanup to how the absolute "pseudo" section is dealt with, but I haven't figured out the nicest approach yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79733 91177308-0d34-0410-b5e6-96231b3b80d8
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
//===- MCSymbol.h - Machine Code Symbols ------------------------*- C++ -*-===//
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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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//
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// This file contains the declaration of the MCSymbol class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSYMBOL_H
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#define LLVM_MC_MCSYMBOL_H
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#include <string>
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class MCSection;
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class MCContext;
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class raw_ostream;
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/// MCSymbol - Instances of this class represent a symbol name in the MC file,
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/// and MCSymbols are created and unique'd by the MCContext class.
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///
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/// If the symbol is defined/emitted into the current translation unit, the
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/// Section member is set to indicate what section it lives in. Otherwise, if
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/// it is a reference to an external entity, it has a null section.
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///
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class MCSymbol {
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// Special sentinal value for the absolute pseudo section.
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//
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// FIXME: Use a PointerInt wrapper for this?
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static const MCSection *AbsolutePseudoSection;
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/// Name - The name of the symbol.
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std::string Name;
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/// Section - The section the symbol is defined in. This is null for
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/// undefined symbols, and the special AbsolutePseudoSection value for
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/// absolute symbols.
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const MCSection *Section;
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/// IsTemporary - True if this is an assembler temporary label, which
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/// typically does not survive in the .o file's symbol table. Usually
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/// "Lfoo" or ".foo".
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unsigned IsTemporary : 1;
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private: // MCContext creates and uniques these.
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friend class MCContext;
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MCSymbol(const StringRef &_Name, bool _IsTemporary)
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: Name(_Name), Section(0),
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IsTemporary(_IsTemporary) {}
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MCSymbol(const MCSymbol&); // DO NOT IMPLEMENT
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void operator=(const MCSymbol&); // DO NOT IMPLEMENT
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public:
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/// getName - Get the symbol name.
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const std::string &getName() const { return Name; }
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/// @name Symbol Location Functions
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/// @{
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/// isUndefined - Check if this symbol undefined (i.e., implicitly defined).
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bool isUndefined() const {
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return Section == 0;
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}
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/// isAbsolute - Check if this this is an absolute symbol.
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bool isAbsolute() const {
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return Section == AbsolutePseudoSection;
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}
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/// getSection - Get the section associated with a defined, non-absolute
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/// symbol.
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const MCSection &getSection() const {
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assert(!isUndefined() && !isAbsolute() && "Invalid accessor!");
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return *Section;
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}
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/// setSection - Mark the symbol as defined in the section \arg S.
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void setSection(const MCSection &S) { Section = &S; }
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/// setUndefined - Mark the symbol as undefined.
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void setUndefined() {
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Section = 0;
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}
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/// setAbsolute - Mark the symbol as absolute.
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void setAbsolute() { Section = AbsolutePseudoSection; }
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/// @}
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/// print - Print the value to the stream \arg OS.
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void print(raw_ostream &OS) const;
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/// dump - Print the value to stderr.
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void dump() const;
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};
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} // end namespace llvm
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#endif
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