#include "llvm/MC/MCSection.h"
namespace llvm {
-
+
+class MCSymbol;
+
/// MCSectionELF - This represents a section on linux, lots of unix variants
/// and some bare metal systems.
class MCSectionELF : public MCSection {
- std::string SectionName;
-
+ /// SectionName - This is the name of the section. The referenced memory is
+ /// owned by TargetLoweringObjectFileELF's ELFUniqueMap.
+ StringRef SectionName;
+
/// Type - This is the sh_type field of a section, drawn from the enums below.
unsigned Type;
-
+
/// Flags - This is the sh_flags field of a section, drawn from the enums.
/// below.
unsigned Flags;
- /// IsExplicit - Indicates that this section comes from globals with an
- /// explicit section specified.
- bool IsExplicit;
-
-protected:
+ /// EntrySize - The size of each entry in this section. This size only
+ /// makes sense for sections that contain fixed-sized entries. If a
+ /// section does not contain fixed-sized entries 'EntrySize' will be 0.
+ unsigned EntrySize;
+
+ const MCSymbol *Group;
+
+private:
+ friend class MCContext;
MCSectionELF(StringRef Section, unsigned type, unsigned flags,
- SectionKind K, bool isExplicit)
- : MCSection(K), SectionName(Section.str()), Type(type), Flags(flags),
- IsExplicit(isExplicit) {}
+ SectionKind K, unsigned entrySize, const MCSymbol *group)
+ : MCSection(SV_ELF, K), SectionName(Section), Type(type), Flags(flags),
+ EntrySize(entrySize), Group(group) {}
+ ~MCSectionELF();
public:
-
- static MCSectionELF *Create(StringRef Section, unsigned Type,
- unsigned Flags, SectionKind K, bool isExplicit,
- MCContext &Ctx);
/// ShouldOmitSectionDirective - Decides whether a '.section' directive
/// should be printed before the section name
bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
- /// ShouldPrintSectionType - Only prints the section type if supported
- bool ShouldPrintSectionType(unsigned Ty) const;
-
/// HasCommonSymbols - True if this section holds common symbols, this is
- /// indicated on the ELF object file by a symbol with SHN_COMMON section
+ /// indicated on the ELF object file by a symbol with SHN_COMMON section
/// header index.
bool HasCommonSymbols() const;
-
+
/// These are the section type and flags fields. An ELF section can have
/// only one Type, but can have more than one of the flags specified.
///
// The section holds a symbol hash table.
SHT_HASH = 0x05U,
-
+
// Information for dynamic linking.
SHT_DYNAMIC = 0x06U,
// The section holds relocation entries without explicit addends.
SHT_REL = 0x09U,
- // This section type is reserved but has unspecified semantics.
+ // This section type is reserved but has unspecified semantics.
SHT_SHLIB = 0x0AU,
// This section holds a symbol table.
// referenced symbol table contain the escape value SHN_XINDEX
SHT_SYMTAB_SHNDX = 0x12U,
- LAST_KNOWN_SECTION_TYPE = SHT_SYMTAB_SHNDX
- };
+ // Start of target-specific flags.
+
+ // Exception Index table
+ SHT_ARM_EXIDX = 0x70000001U,
+ // BPABI DLL dynamic linking pre-emption map
+ SHT_ARM_PREEMPTMAP = 0x70000002U,
+ // Object file compatibility attributes
+ SHT_ARM_ATTRIBUTES = 0x70000003U,
+ SHT_ARM_DEBUGOVERLAY = 0x70000004U,
+ SHT_ARM_OVERLAYSECTION = 0x70000005U,
+
+ LAST_KNOWN_SECTION_TYPE = SHT_ARM_OVERLAYSECTION
+ };
/// Valid section flags.
enum {
// This section holds Thread-Local Storage.
SHF_TLS = 0x400U,
-
- /// FIRST_TARGET_DEP_FLAG - This is the first flag that subclasses are
- /// allowed to specify.
- FIRST_TARGET_DEP_FLAG = 0x800U,
-
- /// TARGET_INDEP_SHF - This is the bitmask for all the target independent
- /// section flags. Targets can define their own target flags above these.
- /// If they do that, they should implement their own MCSectionELF subclasses
- /// and implement the virtual method hooks below to handle printing needs.
- TARGET_INDEP_SHF = FIRST_TARGET_DEP_FLAG-1U
+
+
+ // Start of target-specific flags.
+
+ /// XCORE_SHF_CP_SECTION - All sections with the "c" flag are grouped
+ /// together by the linker to form the constant pool and the cp register is
+ /// set to the start of the constant pool by the boot code.
+ XCORE_SHF_CP_SECTION = 0x800U,
+
+ /// XCORE_SHF_DP_SECTION - All sections with the "d" flag are grouped
+ /// together by the linker to form the data section and the dp register is
+ /// set to the start of the section by the boot code.
+ XCORE_SHF_DP_SECTION = 0x1000U
};
- StringRef getSectionName() const {
- return StringRef(SectionName);
- }
-
+ StringRef getSectionName() const { return SectionName; }
unsigned getType() const { return Type; }
unsigned getFlags() const { return Flags; }
-
- virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
- raw_ostream &OS) const;
-
-
- /// PrintTargetSpecificSectionFlags - Targets that define their own
- /// MCSectionELF subclasses with target specific section flags should
- /// implement this method if they end up adding letters to the attributes
- /// list.
- virtual void PrintTargetSpecificSectionFlags(const MCAsmInfo &MAI,
- raw_ostream &OS) const {
+ unsigned getEntrySize() const { return EntrySize; }
+ const MCSymbol *getGroup() const { return Group; }
+
+ void PrintSwitchToSection(const MCAsmInfo &MAI,
+ raw_ostream &OS) const;
+ virtual bool UseCodeAlign() const;
+ virtual bool isVirtualSection() const;
+
+ /// isBaseAddressKnownZero - We know that non-allocatable sections (like
+ /// debug info) have a base of zero.
+ virtual bool isBaseAddressKnownZero() const {
+ return (getFlags() & SHF_ALLOC) == 0;
+ }
+
+ static bool classof(const MCSection *S) {
+ return S->getVariant() == SV_ELF;
}
-
-
+ static bool classof(const MCSectionELF *) { return true; }
+
+ // Return the entry size for sections with fixed-width data.
+ static unsigned DetermineEntrySize(SectionKind Kind);
+
};
} // end namespace llvm
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