#ifndef LLVM_MC_MCSYMBOL_H
#define LLVM_MC_MCSYMBOL_H
-#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/PointerIntPair.h"
+#include "llvm/ADT/StringMap.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
class MCExpr;
+class MCSymbol;
+class MCFragment;
class MCSection;
class MCContext;
class raw_ostream;
+// TODO: Merge completely with MCSymbol.
+class MCSymbolData {
+ /// Fragment - The fragment this symbol's value is relative to, if any. Also
+ /// stores if this symbol is visible outside this translation unit (bit 0) or
+ /// if it is private extern (bit 1).
+ PointerIntPair<MCFragment *, 2> Fragment;
+
+ union {
+ /// Offset - The offset to apply to the fragment address to form this
+ /// symbol's value.
+ uint64_t Offset;
+
+ /// CommonSize - The size of the symbol, if it is 'common'.
+ uint64_t CommonSize;
+ };
+
+ /// SymbolSize - An expression describing how to calculate the size of
+ /// a symbol. If a symbol has no size this field will be NULL.
+ const MCExpr *SymbolSize = nullptr;
+
+ /// CommonAlign - The alignment of the symbol, if it is 'common', or -1.
+ //
+ // FIXME: Pack this in with other fields?
+ unsigned CommonAlign = -1U;
+
+ /// Flags - The Flags field is used by object file implementations to store
+ /// additional per symbol information which is not easily classified.
+ uint32_t Flags = 0;
+
+public:
+ MCSymbolData() { Offset = 0; }
+
+ MCFragment *getFragment() const { return Fragment.getPointer(); }
+ void setFragment(MCFragment *Value) { Fragment.setPointer(Value); }
+
+ uint64_t getOffset() const {
+ assert(!isCommon());
+ return Offset;
+ }
+ void setOffset(uint64_t Value) {
+ assert(!isCommon());
+ Offset = Value;
+ }
+
+ /// @}
+ /// \name Symbol Attributes
+ /// @{
+
+ bool isExternal() const { return Fragment.getInt() & 1; }
+ void setExternal(bool Value) {
+ Fragment.setInt((Fragment.getInt() & ~1) | unsigned(Value));
+ }
+
+ bool isPrivateExtern() const { return Fragment.getInt() & 2; }
+ void setPrivateExtern(bool Value) {
+ Fragment.setInt((Fragment.getInt() & ~2) | (unsigned(Value) << 1));
+ }
+
+ /// isCommon - Is this a 'common' symbol.
+ bool isCommon() const { return CommonAlign != -1U; }
+
+ /// setCommon - Mark this symbol as being 'common'.
+ ///
+ /// \param Size - The size of the symbol.
+ /// \param Align - The alignment of the symbol.
+ void setCommon(uint64_t Size, unsigned Align) {
+ assert(getOffset() == 0);
+ CommonSize = Size;
+ CommonAlign = Align;
+ }
+
+ /// getCommonSize - Return the size of a 'common' symbol.
+ uint64_t getCommonSize() const {
+ assert(isCommon() && "Not a 'common' symbol!");
+ return CommonSize;
+ }
+
+ void setSize(const MCExpr *SS) { SymbolSize = SS; }
+
+ const MCExpr *getSize() const { return SymbolSize; }
+
+ /// getCommonAlignment - Return the alignment of a 'common' symbol.
+ unsigned getCommonAlignment() const {
+ assert(isCommon() && "Not a 'common' symbol!");
+ return CommonAlign;
+ }
+
+ /// getFlags - Get the (implementation defined) symbol flags.
+ uint32_t getFlags() const { return Flags; }
+
+ /// setFlags - Set the (implementation defined) symbol flags.
+ void setFlags(uint32_t Value) { Flags = Value; }
+
+ /// modifyFlags - Modify the flags via a mask
+ void modifyFlags(uint32_t Value, uint32_t Mask) {
+ Flags = (Flags & ~Mask) | Value;
+ }
+
+ /// @}
+
+ void dump() const;
+};
+
/// MCSymbol - Instances of this class represent a symbol name in the MC file,
/// and MCSymbols are created and uniqued by the MCContext class. MCSymbols
/// should only be constructed with valid names for the object file.
// Special sentinal value for the absolute pseudo section.
//
// FIXME: Use a PointerInt wrapper for this?
- static const MCSection *AbsolutePseudoSection;
+ static 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;
+ const StringMapEntry<bool> *Name;
- /// Section - The section the symbol is defined in. This is null for
- /// undefined symbols, and the special AbsolutePseudoSection value for
- /// absolute symbols. If this is a variable symbol, this caches the
- /// variable value's section.
- mutable const MCSection *Section;
+ /// The section the symbol is defined in. This is null for undefined symbols,
+ /// and the special AbsolutePseudoSection value for absolute symbols. If this
+ /// is a variable symbol, this caches the variable value's section.
+ mutable MCSection *Section;
/// Value - If non-null, the value for a variable symbol.
const MCExpr *Value;
/// IsUsed - True if this symbol has been used.
mutable unsigned IsUsed : 1;
+ mutable bool HasData : 1;
+
+ /// Index field, for use by the object file implementation.
+ mutable uint64_t Index : 60;
+
+ mutable MCSymbolData Data;
+
private: // MCContext creates and uniques these.
friend class MCExpr;
friend class MCContext;
- MCSymbol(StringRef name, bool isTemporary)
- : Name(name), Section(nullptr), Value(nullptr), IsTemporary(isTemporary),
- IsRedefinable(false), IsUsed(false) {}
+ MCSymbol(const StringMapEntry<bool> *Name, bool isTemporary)
+ : Name(Name), Section(nullptr), Value(nullptr), IsTemporary(isTemporary),
+ IsRedefinable(false), IsUsed(false), HasData(false), Index(0) {}
MCSymbol(const MCSymbol &) = delete;
void operator=(const MCSymbol &) = delete;
- const MCSection *getSectionPtr() const {
+ MCSection *getSectionPtr() const {
if (Section || !Value)
return Section;
return Section = Value->FindAssociatedSection();
public:
/// getName - Get the symbol name.
- StringRef getName() const { return Name; }
+ StringRef getName() const { return Name ? Name->first() : ""; }
+
+ bool hasData() const { return HasData; }
+
+ /// Get associated symbol data.
+ MCSymbolData &getData() const {
+ assert(HasData && "Missing symbol data!");
+ return Data;
+ }
+
+ /// Initialize symbol data.
+ ///
+ /// Nothing really to do here, but this is enables an assertion that \a
+ /// MCAssembler::getOrCreateSymbolData() has actually been called before
+ /// anyone calls \a getData().
+ void initializeData() const { HasData = true; }
/// \name Accessors
/// @{
/// isAbsolute - Check if this is an absolute symbol.
bool isAbsolute() const { return getSectionPtr() == AbsolutePseudoSection; }
- /// getSection - Get the section associated with a defined, non-absolute
- /// symbol.
- const MCSection &getSection() const {
+ /// Get the section associated with a defined, non-absolute symbol.
+ MCSection &getSection() const {
assert(isInSection() && "Invalid accessor!");
return *getSectionPtr();
}
- /// setSection - Mark the symbol as defined in the section \p S.
- void setSection(const MCSection &S) {
+ /// Mark the symbol as defined in the section \p S.
+ void setSection(MCSection &S) {
assert(!isVariable() && "Cannot set section of variable");
Section = &S;
}
/// @}
+ /// Get the (implementation defined) index.
+ uint64_t getIndex() const {
+ assert(HasData && "Uninitialized symbol data");
+ return Index;
+ }
+
+ /// Set the (implementation defined) index.
+ void setIndex(uint64_t Value) const {
+ assert(HasData && "Uninitialized symbol data");
+ assert(!(Value >> 60) && "Not enough bits for value");
+ Index = Value;
+ }
+
/// print - Print the value to the stream \p OS.
void print(raw_ostream &OS) const;
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