#ifndef LLVM_MC_MCSECTIONELF_H
#define LLVM_MC_MCSECTIONELF_H
+#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCSection.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ELF.h"
+#include "llvm/Support/raw_ostream.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 specfied.
- bool IsExplicit;
-
- MCSectionELF(const StringRef &Section, unsigned T, unsigned F,
- SectionKind K, bool isExplicit)
- : MCSection(K), SectionName(Section.str()), Type(T), Flags(F),
- IsExplicit(isExplicit) {}
+ /// 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, unsigned entrySize, const MCSymbol *group)
+ : MCSection(SV_ELF, K), SectionName(Section), Type(type), Flags(flags),
+ EntrySize(entrySize), Group(group) {}
+ ~MCSectionELF();
public:
-
- static MCSectionELF *Create(const 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(const char *Name,
- const TargetAsmInfo &TAI) 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
- /// 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.
- ///
- /// Valid section types.
- enum {
- // This value marks the section header as inactive.
- SHT_NULL = 0x00U,
-
- // Holds information defined by the program, with custom format and meaning.
- SHT_PROGBITS = 0x01U,
-
- // This section holds a symbol table.
- SHT_SYMTAB = 0x02U,
-
- // The section holds a string table.
- SHT_STRTAB = 0x03U,
-
- // The section holds relocation entries with explicit addends.
- SHT_RELA = 0x04U,
-
- // The section holds a symbol hash table.
- SHT_HASH = 0x05U,
-
- // Information for dynamic linking.
- SHT_DYNAMIC = 0x06U,
-
- // The section holds information that marks the file in some way.
- SHT_NOTE = 0x07U,
-
- // A section of this type occupies no space in the file.
- SHT_NOBITS = 0x08U,
-
- // The section holds relocation entries without explicit addends.
- SHT_REL = 0x09U,
-
- // This section type is reserved but has unspecified semantics.
- SHT_SHLIB = 0x0aU,
-
- // This section holds a symbol table.
- SHT_DYNSYM = 0x0bU,
-
- // This section contains an array of pointers to initialization functions.
- SHT_INIT_ARRAY = 0x0eU,
-
- // This section contains an array of pointers to termination functions.
- SHT_FINI_ARRAY = 0x0fU,
+ bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const;
- // This section contains an array of pointers to functions that are invoked
- // before all other initialization functions.
- SHT_PREINIT_ARRAY = 0x10U,
-
- // A section group is a set of sections that are related and that must be
- // treated specially by the linker.
- SHT_GROUP = 0x11U,
-
- // This section is associated with a section of type SHT_SYMTAB, when the
- // referenced symbol table contain the escape value SHN_XINDEX
- SHT_SYMTAB_SHNDX = 0x12U,
-
- LAST_KNOWN_SECTION_TYPE = SHT_SYMTAB_SHNDX
- };
-
- /// Valid section flags.
- enum {
- // The section contains data that should be writable.
- SHF_WRITE = 0x1U,
-
- // The section occupies memory during execution.
- SHF_ALLOC = 0x2U,
-
- // The section contains executable machine instructions.
- SHF_EXECINSTR = 0x4U,
-
- // The data in the section may be merged to eliminate duplication.
- SHF_MERGE = 0x10U,
-
- // Elements in the section consist of null-terminated character strings.
- SHF_STRINGS = 0x20U,
-
- // A field in this section holds a section header table index.
- SHF_INFO_LINK = 0x40U,
-
- // Adds special ordering requirements for link editors.
- SHF_LINK_ORDER = 0x80U,
-
- // This section requires special OS-specific processing to avoid incorrect
- // behavior.
- SHF_OS_NONCONFORMING = 0x100U,
-
- // This section is a member of a section group.
- SHF_GROUP = 0x200U,
-
- // This section holds Thread-Local Storage.
- SHF_TLS = 0x400U
- };
-
- StringRef getSectionName() const {
- return StringRef(SectionName);
+ StringRef getSectionName() const { return SectionName; }
+ virtual std::string getLabelBeginName() const {
+ return SectionName.str() + "_begin"; }
+ virtual std::string getLabelEndName() const {
+ return SectionName.str() + "_end";
}
-
unsigned getType() const { return Type; }
unsigned getFlags() const { return Flags; }
-
- virtual void PrintSwitchToSection(const TargetAsmInfo &TAI,
- raw_ostream &OS) const;
+ unsigned getEntrySize() const { return EntrySize; }
+ const MCSymbol *getGroup() const { return Group; }
+
+ void PrintSwitchToSection(const MCAsmInfo &MAI,
+ raw_ostream &OS,
+ const MCExpr *Subsection) 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() & ELF::SHF_ALLOC) == 0;
+ }
+
+ static bool classof(const MCSection *S) {
+ return S->getVariant() == SV_ELF;
+ }
+
+ // Return the entry size for sections with fixed-width data.
+ static unsigned DetermineEntrySize(SectionKind Kind);
+
};
} // end namespace llvm
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