#ifndef LLVM_MC_MCSYMBOL_H
#define LLVM_MC_MCSYMBOL_H
-#include "llvm/ADT/PointerIntPair.h"
+#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/StringMap.h"
+#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
+class MCAsmInfo;
class MCExpr;
class MCSymbol;
class MCFragment;
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;
-
-
- /// 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() = default;
-
- MCFragment *getFragment() const { return Fragment.getPointer(); }
- void setFragment(MCFragment *Value) { Fragment.setPointer(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));
- }
-
- /// 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.
/// 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 {
+protected:
+ /// The kind of the symbol. If it is any value other than unset then this
+ /// class is actually one of the appropriate subclasses of MCSymbol.
+ enum SymbolKind {
+ SymbolKindUnset,
+ SymbolKindCOFF,
+ SymbolKindELF,
+ SymbolKindMachO,
+ };
+
// Special sentinal value for the absolute pseudo section.
//
// FIXME: Use a PointerInt wrapper for this?
/// held by the StringMap that lives in MCContext.
const StringMapEntry<bool> *Name;
- /// 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;
+ /// If a symbol has a Fragment, the section is implied, so we only need
+ /// one pointer.
+ /// FIXME: We might be able to simplify this by having the asm streamer create
+ /// dummy fragments.
+ /// If this is a section, then it gives 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.
+ ///
+ /// If this is a fragment, then it gives the fragment this symbol's value is
+ /// relative to, if any.
+ mutable PointerUnion<MCSection *, MCFragment *> SectionOrFragment;
/// 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;
+ mutable bool IsRegistered : 1;
- /// Index field, for use by the object file implementation.
- mutable uint64_t Index : 60;
+ /// This symbol is visible outside this translation unit.
+ mutable unsigned IsExternal : 1;
- /// 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;
+ /// This symbol is private extern.
+ mutable unsigned IsPrivateExtern : 1;
- /// The alignment of the symbol, if it is 'common', or -1.
- //
- // FIXME: Pack this in with other fields?
- unsigned CommonAlign = -1U;
+ /// LLVM RTTI discriminator. This is actually a SymbolKind enumerator, but is
+ /// unsigned to avoid sign extension and achieve better bitpacking with MSVC.
+ unsigned Kind : 2;
+
+ /// Index field, for use by the object file implementation.
+ mutable uint32_t Index = 0;
union {
/// The offset to apply to the fragment address to form this symbol's value.
uint64_t CommonSize;
};
- mutable MCSymbolData Data;
+ /// The alignment of the symbol, if it is 'common', or -1.
+ //
+ // FIXME: Pack this in with other fields?
+ unsigned CommonAlign = -1U;
-private: // MCContext creates and uniques these.
+ /// The Flags field is used by object file implementations to store
+ /// additional per symbol information which is not easily classified.
+ mutable uint32_t Flags = 0;
+
+protected: // MCContext creates and uniques these.
friend class MCExpr;
friend class MCContext;
- MCSymbol(const StringMapEntry<bool> *Name, bool isTemporary)
- : Name(Name), Section(nullptr), Value(nullptr), IsTemporary(isTemporary),
- IsRedefinable(false), IsUsed(false), HasData(false), Index(0) {
+ MCSymbol(SymbolKind Kind, const StringMapEntry<bool> *Name, bool isTemporary)
+ : Name(Name), Value(nullptr), IsTemporary(isTemporary),
+ IsRedefinable(false), IsUsed(false), IsRegistered(false),
+ IsExternal(false), IsPrivateExtern(false),
+ Kind(Kind) {
Offset = 0;
}
+private:
MCSymbol(const MCSymbol &) = delete;
void operator=(const MCSymbol &) = delete;
MCSection *getSectionPtr() const {
+ if (MCFragment *F = getFragment())
+ return F->getParent();
+ assert(!SectionOrFragment.is<MCFragment *>() && "Section or null expected");
+ MCSection *Section = SectionOrFragment.dyn_cast<MCSection *>();
if (Section || !Value)
return Section;
- return Section = Value->FindAssociatedSection();
+ return Section = Value->findAssociatedSection();
}
public:
/// getName - Get the symbol 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; }
+ bool isRegistered() const { return IsRegistered; }
+ void setIsRegistered(bool Value) const { IsRegistered = Value; }
/// \name Accessors
/// @{
void redefineIfPossible() {
if (IsRedefinable) {
Value = nullptr;
- Section = nullptr;
+ SectionOrFragment = nullptr;
IsRedefinable = false;
}
}
/// Mark the symbol as defined in the section \p S.
void setSection(MCSection &S) {
assert(!isVariable() && "Cannot set section of variable");
- Section = &S;
+ assert(!SectionOrFragment.is<MCFragment *>() && "Section or null expected");
+ SectionOrFragment = &S;
+ }
+
+ /// Mark the symbol as undefined.
+ void setUndefined() {
+ SectionOrFragment = nullptr;
}
- /// setUndefined - Mark the symbol as undefined.
- void setUndefined() { Section = nullptr; }
+ bool isELF() const { return Kind == SymbolKindELF; }
+
+ bool isCOFF() const { return Kind == SymbolKindCOFF; }
+
+ bool isMachO() const { return Kind == SymbolKindMachO; }
/// @}
/// \name Variable Symbols
/// @}
/// Get the (implementation defined) index.
- uint64_t getIndex() const {
- assert(HasData && "Uninitialized symbol data");
+ uint32_t getIndex() const {
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");
+ void setIndex(uint32_t Value) const {
Index = Value;
}
- void setSize(const MCExpr *SS) { SymbolSize = SS; }
-
- const MCExpr *getSize() const { return SymbolSize; }
-
uint64_t getOffset() const {
assert(!isCommon());
return Offset;
return CommonAlign;
}
+ /// Declare this symbol as being 'common'.
+ ///
+ /// \param Size - The size of the symbol.
+ /// \param Align - The alignment of the symbol.
+ /// \return True if symbol was already declared as a different type
+ bool declareCommon(uint64_t Size, unsigned Align) {
+ assert(isCommon() || getOffset() == 0);
+ if(isCommon()) {
+ if(CommonSize != Size || CommonAlign != Align)
+ return true;
+ } else
+ setCommon(Size, Align);
+ return false;
+ }
+
/// Is this a 'common' symbol.
bool isCommon() const { return CommonAlign != -1U; }
+ MCFragment *getFragment() const {
+ return SectionOrFragment.dyn_cast<MCFragment *>();
+ }
+ void setFragment(MCFragment *Value) const {
+ SectionOrFragment = Value;
+ }
+
+ bool isExternal() const { return IsExternal; }
+ void setExternal(bool Value) const { IsExternal = Value; }
+
+ bool isPrivateExtern() const { return IsPrivateExtern; }
+ void setPrivateExtern(bool Value) { IsPrivateExtern = Value; }
+
/// print - Print the value to the stream \p OS.
- void print(raw_ostream &OS) const;
+ void print(raw_ostream &OS, const MCAsmInfo *MAI) const;
/// dump - Print the value to stderr.
void dump() const;
+
+protected:
+ /// Get the (implementation defined) symbol flags.
+ uint32_t getFlags() const { return Flags; }
+
+ /// Set the (implementation defined) symbol flags.
+ void setFlags(uint32_t Value) const { Flags = Value; }
+
+ /// Modify the flags via a mask
+ void modifyFlags(uint32_t Value, uint32_t Mask) const {
+ Flags = (Flags & ~Mask) | Value;
+ }
};
inline raw_ostream &operator<<(raw_ostream &OS, const MCSymbol &Sym) {
- Sym.print(OS);
+ Sym.print(OS, nullptr);
return OS;
}
} // end namespace llvm
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