#ifndef LLVM_MC_MCSYMBOL_H
#define LLVM_MC_MCSYMBOL_H
-#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/MC/MCAssembler.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;
// 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;
-
- /// 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;
+ const StringMapEntry<bool> *Name;
+
+ /// 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.
+ union {
+ /// 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;
+
+ /// The fragment this symbol's value is relative to, if any.
+ mutable MCFragment *Fragment;
+ };
/// 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;
-private: // MCContext creates and uniques these.
+ mutable bool IsRegistered : 1;
+
+ /// This symbol is visible outside this translation unit.
+ mutable unsigned IsExternal : 1;
+
+ /// This symbol is private extern.
+ mutable unsigned IsPrivateExtern : 1;
+
+ mutable unsigned HasFragment : 1;
+
+ unsigned IsELF : 1;
+
+ /// 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 Offset;
+
+ /// The size of the symbol, if it is 'common'.
+ uint64_t CommonSize;
+ };
+
+ /// The alignment of the symbol, if it is 'common', or -1.
+ //
+ // FIXME: Pack this in with other fields?
+ unsigned CommonAlign = -1U;
+
+ /// 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(StringRef name, bool isTemporary)
- : Name(name), Section(nullptr), Value(nullptr), IsTemporary(isTemporary),
- IsRedefinable(false), IsUsed(false) {}
+ MCSymbol(bool IsELF, const StringMapEntry<bool> *Name, bool isTemporary)
+ : Name(Name), Section(nullptr), Value(nullptr), IsTemporary(isTemporary),
+ IsRedefinable(false), IsUsed(false), IsRegistered(false),
+ IsExternal(false), IsPrivateExtern(false), HasFragment(false),
+ IsELF(IsELF) {
+ Offset = 0;
+ }
+private:
MCSymbol(const MCSymbol &) = delete;
void operator=(const MCSymbol &) = delete;
- const MCSection *getSectionPtr() const {
+ MCSection *getSectionPtr() const {
+ if (MCFragment *F = getFragment())
+ return F->getParent();
+ assert(!HasFragment);
if (Section || !Value)
return Section;
- return Section = Value->FindAssociatedSection();
+ return Section = Value->findAssociatedSection();
}
public:
/// getName - Get the symbol name.
- StringRef getName() const { return Name; }
+ StringRef getName() const { return Name ? Name->first() : ""; }
+
+ bool isRegistered() const { return IsRegistered; }
+ void setIsRegistered(bool Value) const { IsRegistered = Value; }
/// \name Accessors
/// @{
if (IsRedefinable) {
Value = nullptr;
Section = nullptr;
+ HasFragment = false;
IsRedefinable = false;
}
}
/// 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");
+ assert(!HasFragment);
Section = &S;
}
- /// setUndefined - Mark the symbol as undefined.
- void setUndefined() { Section = nullptr; }
+ /// Mark the symbol as undefined.
+ void setUndefined() {
+ HasFragment = false;
+ Section = nullptr;
+ }
+
+ bool isELF() const { return IsELF; }
/// @}
/// \name Variable Symbols
/// @}
+ /// Get the (implementation defined) index.
+ uint32_t getIndex() const {
+ return Index;
+ }
+
+ /// Set the (implementation defined) index.
+ void setIndex(uint32_t Value) const {
+ Index = Value;
+ }
+
+ uint64_t getOffset() const {
+ assert(!isCommon());
+ return Offset;
+ }
+ void setOffset(uint64_t Value) {
+ assert(!isCommon());
+ Offset = Value;
+ }
+
+ /// Return the size of a 'common' symbol.
+ uint64_t getCommonSize() const {
+ assert(isCommon() && "Not a 'common' symbol!");
+ return CommonSize;
+ }
+
+ /// 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;
+ }
+
+ /// Return the alignment of a 'common' symbol.
+ unsigned getCommonAlignment() const {
+ assert(isCommon() && "Not a 'common' symbol!");
+ return CommonAlign;
+ }
+
+ /// Is this a 'common' symbol.
+ bool isCommon() const { return CommonAlign != -1U; }
+
+ /// 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;
+ }
+
+ MCFragment *getFragment() const {
+ if (!HasFragment)
+ return nullptr;
+ return Fragment;
+ }
+ void setFragment(MCFragment *Value) const {
+ HasFragment = true;
+ Fragment = 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;
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