/usr/include/llvm-3.5/llvm/MC/MCSymbol.h is in llvm-3.5-dev 1:3.5~svn201651-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | //===- MCSymbol.h - Machine Code Symbols ------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the MCSymbol class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSYMBOL_H
#define LLVM_MC_MCSYMBOL_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
class MCExpr;
class MCSection;
class MCContext;
class raw_ostream;
/// MCSymbol - Instances of this class represent a symbol name in the MC file,
/// and MCSymbols are created and unique'd by the MCContext class. MCSymbols
/// should only be constructed with valid names for the object file.
///
/// If the symbol is defined/emitted into the current translation unit, the
/// Section member is set to indicate what section it lives in. Otherwise, if
/// it is a reference to an external entity, it has a null section.
class MCSymbol {
// Special sentinal value for the absolute pseudo section.
//
// FIXME: Use a PointerInt wrapper for this?
static const MCSection *AbsolutePseudoSection;
/// Name - The name of the symbol. The referred-to string data is actually
/// held by the StringMap that lives in MCContext.
StringRef Name;
/// Section - The section the symbol is defined in. This is null for
/// undefined symbols, and the special AbsolutePseudoSection value for
/// absolute symbols.
const MCSection *Section;
/// Value - If non-null, the value for a variable symbol.
const MCExpr *Value;
/// IsTemporary - True if this is an assembler temporary label, which
/// typically does not survive in the .o file's symbol table. Usually
/// "Lfoo" or ".foo".
unsigned IsTemporary : 1;
/// IsUsed - True if this symbol has been used.
mutable unsigned IsUsed : 1;
private: // MCContext creates and uniques these.
friend class MCExpr;
friend class MCContext;
MCSymbol(StringRef name, bool isTemporary)
: Name(name), Section(0), Value(0),
IsTemporary(isTemporary), IsUsed(false) {}
MCSymbol(const MCSymbol&) LLVM_DELETED_FUNCTION;
void operator=(const MCSymbol&) LLVM_DELETED_FUNCTION;
public:
/// getName - Get the symbol name.
StringRef getName() const { return Name; }
/// @name Accessors
/// @{
/// isTemporary - Check if this is an assembler temporary symbol.
bool isTemporary() const { return IsTemporary; }
/// isUsed - Check if this is used.
bool isUsed() const { return IsUsed; }
void setUsed(bool Value) const { IsUsed = Value; }
/// @}
/// @name Associated Sections
/// @{
/// isDefined - Check if this symbol is defined (i.e., it has an address).
///
/// Defined symbols are either absolute or in some section.
bool isDefined() const {
return Section != 0;
}
/// isInSection - Check if this symbol is defined in some section (i.e., it
/// is defined but not absolute).
bool isInSection() const {
return isDefined() && !isAbsolute();
}
/// isUndefined - Check if this symbol undefined (i.e., implicitly defined).
bool isUndefined() const {
return !isDefined();
}
/// isAbsolute - Check if this is an absolute symbol.
bool isAbsolute() const {
return Section == AbsolutePseudoSection;
}
/// getSection - Get the section associated with a defined, non-absolute
/// symbol.
const MCSection &getSection() const {
assert(isInSection() && "Invalid accessor!");
return *Section;
}
/// setSection - Mark the symbol as defined in the section \p S.
void setSection(const MCSection &S) { Section = &S; }
/// setUndefined - Mark the symbol as undefined.
void setUndefined() {
Section = 0;
}
/// setAbsolute - Mark the symbol as absolute.
void setAbsolute() { Section = AbsolutePseudoSection; }
/// @}
/// @name Variable Symbols
/// @{
/// isVariable - Check if this is a variable symbol.
bool isVariable() const {
return Value != 0;
}
/// getVariableValue() - Get the value for variable symbols.
const MCExpr *getVariableValue() const {
assert(isVariable() && "Invalid accessor!");
IsUsed = true;
return Value;
}
// AliasedSymbol() - If this is an alias (a = b), return the symbol
// we ultimately point to. For a non-alias, this just returns the symbol
// itself.
const MCSymbol &AliasedSymbol() const;
void setVariableValue(const MCExpr *Value);
/// @}
/// print - Print the value to the stream \p OS.
void print(raw_ostream &OS) const;
/// dump - Print the value to stderr.
void dump() const;
};
inline raw_ostream &operator<<(raw_ostream &OS, const MCSymbol &Sym) {
Sym.print(OS);
return OS;
}
} // end namespace llvm
#endif
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