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llvm-mirror/lib/CodeGen/MachO.h
Bruno Cardoso Lopes 9408fc6842 Move structures and classes into header files, providing two new headers and 
one new .cpp file, in preparation for merging in the Direct Object Emission
changes we're working on. No functional changes.
Fixed coding style issues on the original patch. Patch by Aaron Gray

llvm-svn: 72754
2009-06-03 03:43:31 +00:00

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//=== MachO.h - Mach-O structures and constants -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines MachO .
//
//===----------------------------------------------------------------------===//
#ifndef MACHO_H
#define MACHO_H
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/MachineRelocation.h"
#include "llvm/Target/TargetAsmInfo.h"
#include <string>
#include <vector>
namespace llvm {
typedef std::vector<unsigned char> DataBuffer;
/// MachOSym - This struct contains information about each symbol that is
/// added to logical symbol table for the module. This is eventually
/// turned into a real symbol table in the file.
struct MachOSym {
const GlobalValue *GV; // The global value this corresponds to.
std::string GVName; // The mangled name of the global value.
uint32_t n_strx; // index into the string table
uint8_t n_type; // type flag
uint8_t n_sect; // section number or NO_SECT
int16_t n_desc; // see <mach-o/stab.h>
uint64_t n_value; // value for this symbol (or stab offset)
// Constants for the n_sect field
// see <mach-o/nlist.h>
enum { NO_SECT = 0 }; // symbol is not in any section
// Constants for the n_type field
// see <mach-o/nlist.h>
enum { N_UNDF = 0x0, // undefined, n_sect == NO_SECT
N_ABS = 0x2, // absolute, n_sect == NO_SECT
N_SECT = 0xe, // defined in section number n_sect
N_PBUD = 0xc, // prebound undefined (defined in a dylib)
N_INDR = 0xa // indirect
};
// The following bits are OR'd into the types above. For example, a type
// of 0x0f would be an external N_SECT symbol (0x0e | 0x01).
enum { N_EXT = 0x01, // external symbol bit
N_PEXT = 0x10 // private external symbol bit
};
// Constants for the n_desc field
// see <mach-o/loader.h>
enum { REFERENCE_FLAG_UNDEFINED_NON_LAZY = 0,
REFERENCE_FLAG_UNDEFINED_LAZY = 1,
REFERENCE_FLAG_DEFINED = 2,
REFERENCE_FLAG_PRIVATE_DEFINED = 3,
REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY = 4,
REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY = 5
};
enum { N_NO_DEAD_STRIP = 0x0020, // symbol is not to be dead stripped
N_WEAK_REF = 0x0040, // symbol is weak referenced
N_WEAK_DEF = 0x0080 // coalesced symbol is a weak definition
};
MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
const TargetAsmInfo *TAI);
struct SymCmp {
// FIXME: this does not appear to be sorting 'f' after 'F'
bool operator()(const MachOSym &LHS, const MachOSym &RHS) {
return LHS.GVName < RHS.GVName;
}
};
/// PartitionByLocal - Simple boolean predicate that returns true if Sym is
/// a local symbol rather than an external symbol.
static inline bool PartitionByLocal(const MachOSym &Sym) {
return (Sym.n_type & (MachOSym::N_EXT | MachOSym::N_PEXT)) == 0;
}
/// PartitionByDefined - Simple boolean predicate that returns true if Sym is
/// defined in this module.
static inline bool PartitionByDefined(const MachOSym &Sym) {
// FIXME: Do N_ABS or N_INDR count as defined?
return (Sym.n_type & MachOSym::N_SECT) == MachOSym::N_SECT;
}
}; // end struct MachOSym
/// MachOHeader - This struct contains the header information about a
/// specific architecture type/subtype pair that is emitted to the file.
struct MachOHeader {
uint32_t magic; // mach magic number identifier
uint32_t filetype; // type of file
uint32_t ncmds; // number of load commands
uint32_t sizeofcmds; // the size of all the load commands
uint32_t flags; // flags
uint32_t reserved; // 64-bit only
/// HeaderData - The actual data for the header which we are building
/// up for emission to the file.
DataBuffer HeaderData;
// Constants for the filetype field
// see <mach-o/loader.h> for additional info on the various types
enum { MH_OBJECT = 1, // relocatable object file
MH_EXECUTE = 2, // demand paged executable file
MH_FVMLIB = 3, // fixed VM shared library file
MH_CORE = 4, // core file
MH_PRELOAD = 5, // preloaded executable file
MH_DYLIB = 6, // dynamically bound shared library
MH_DYLINKER = 7, // dynamic link editor
MH_BUNDLE = 8, // dynamically bound bundle file
MH_DYLIB_STUB = 9, // shared library stub for static linking only
MH_DSYM = 10 // companion file wiht only debug sections
};
// Constants for the flags field
enum { MH_NOUNDEFS = 1 << 0,
// the object file has no undefined references
MH_INCRLINK = 1 << 1,
// the object file is the output of an incremental link against
// a base file and cannot be link edited again
MH_DYLDLINK = 1 << 2,
// the object file is input for the dynamic linker and cannot be
// statically link edited again.
MH_BINDATLOAD = 1 << 3,
// the object file's undefined references are bound by the
// dynamic linker when loaded.
MH_PREBOUND = 1 << 4,
// the file has its dynamic undefined references prebound
MH_SPLIT_SEGS = 1 << 5,
// the file has its read-only and read-write segments split
// see <mach/shared_memory_server.h>
MH_LAZY_INIT = 1 << 6,
// the shared library init routine is to be run lazily via
// catching memory faults to its writable segments (obsolete)
MH_TWOLEVEL = 1 << 7,
// the image is using two-level namespace bindings
MH_FORCE_FLAT = 1 << 8,
// the executable is forcing all images to use flat namespace
// bindings.
MH_NOMULTIDEFS = 1 << 8,
// this umbrella guarantees no multiple definitions of symbols
// in its sub-images so the two-level namespace hints can
// always be used.
MH_NOFIXPREBINDING = 1 << 10,
// do not have dyld notify the prebidning agent about this
// executable.
MH_PREBINDABLE = 1 << 11,
// the binary is not prebound but can have its prebinding
// redone. only used when MH_PREBOUND is not set.
MH_ALLMODSBOUND = 1 << 12,
// indicates that this binary binds to all two-level namespace
// modules of its dependent libraries. Only used when
// MH_PREBINDABLE and MH_TWOLEVEL are both set.
MH_SUBSECTIONS_VIA_SYMBOLS = 1 << 13,
// safe to divide up the sections into sub-sections via symbols
// for dead code stripping.
MH_CANONICAL = 1 << 14,
// the binary has been canonicalized via the unprebind operation
MH_WEAK_DEFINES = 1 << 15,
// the final linked image contains external weak symbols
MH_BINDS_TO_WEAK = 1 << 16,
// the final linked image uses weak symbols
MH_ALLOW_STACK_EXECUTION = 1 << 17
// When this bit is set, all stacks in the task will be given
// stack execution privilege. Only used in MH_EXECUTE filetype
};
MachOHeader() : magic(0), filetype(0), ncmds(0), sizeofcmds(0), flags(0),
reserved(0) { }
/// cmdSize - This routine returns the size of the MachOSection as written
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
unsigned cmdSize(bool is64Bit) const {
if (is64Bit)
return 8 * sizeof(uint32_t);
else
return 7 * sizeof(uint32_t);
}
/// setMagic - This routine sets the appropriate value for the 'magic'
/// field based on pointer size and endianness.
void setMagic(bool isLittleEndian, bool is64Bit) {
if (isLittleEndian)
if (is64Bit) magic = 0xcffaedfe;
else magic = 0xcefaedfe;
else
if (is64Bit) magic = 0xfeedfacf;
else magic = 0xfeedface;
}
}; // end struct MachOHeader
/// MachOSegment - This struct contains the necessary information to
/// emit the load commands for each section in the file.
struct MachOSegment {
uint32_t cmd; // LC_SEGMENT or LC_SEGMENT_64
uint32_t cmdsize; // Total size of this struct and section commands
std::string segname; // segment name
uint64_t vmaddr; // address of this segment
uint64_t vmsize; // size of this segment, may be larger than filesize
uint64_t fileoff; // offset in file
uint64_t filesize; // amount to read from file
uint32_t maxprot; // maximum VM protection
uint32_t initprot; // initial VM protection
uint32_t nsects; // number of sections in this segment
uint32_t flags; // flags
// The following constants are getting pulled in by one of the
// system headers, which creates a neat clash with the enum.
#if !defined(VM_PROT_NONE)
#define VM_PROT_NONE 0x00
#endif
#if !defined(VM_PROT_READ)
#define VM_PROT_READ 0x01
#endif
#if !defined(VM_PROT_WRITE)
#define VM_PROT_WRITE 0x02
#endif
#if !defined(VM_PROT_EXECUTE)
#define VM_PROT_EXECUTE 0x04
#endif
#if !defined(VM_PROT_ALL)
#define VM_PROT_ALL 0x07
#endif
// Constants for the vm protection fields
// see <mach-o/vm_prot.h>
enum { SEG_VM_PROT_NONE = VM_PROT_NONE,
SEG_VM_PROT_READ = VM_PROT_READ, // read permission
SEG_VM_PROT_WRITE = VM_PROT_WRITE, // write permission
SEG_VM_PROT_EXECUTE = VM_PROT_EXECUTE,
SEG_VM_PROT_ALL = VM_PROT_ALL
};
// Constants for the cmd field
// see <mach-o/loader.h>
enum { LC_SEGMENT = 0x01, // segment of this file to be mapped
LC_SEGMENT_64 = 0x19 // 64-bit segment of this file to be mapped
};
/// cmdSize - This routine returns the size of the MachOSection as written
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
unsigned cmdSize(bool is64Bit) const {
if (is64Bit)
return 6 * sizeof(uint32_t) + 4 * sizeof(uint64_t) + 16;
else
return 10 * sizeof(uint32_t) + 16; // addresses only 32 bits
}
MachOSegment(const std::string &seg, bool is64Bit)
: cmd(is64Bit ? LC_SEGMENT_64 : LC_SEGMENT), cmdsize(0), segname(seg),
vmaddr(0), vmsize(0), fileoff(0), filesize(0), maxprot(VM_PROT_ALL),
initprot(VM_PROT_ALL), nsects(0), flags(0) { }
};
/// MachOSection - This struct contains information about each section in a
/// particular segment that is emitted to the file. This is eventually
/// turned into the SectionCommand in the load command for a particlar
/// segment.
struct MachOSection {
std::string sectname; // name of this section,
std::string segname; // segment this section goes in
uint64_t addr; // memory address of this section
uint64_t size; // size in bytes of this section
uint32_t offset; // file offset of this section
uint32_t align; // section alignment (power of 2)
uint32_t reloff; // file offset of relocation entries
uint32_t nreloc; // number of relocation entries
uint32_t flags; // flags (section type and attributes)
uint32_t reserved1; // reserved (for offset or index)
uint32_t reserved2; // reserved (for count or sizeof)
uint32_t reserved3; // reserved (64 bit only)
/// A unique number for this section, which will be used to match symbols
/// to the correct section.
uint32_t Index;
/// SectionData - The actual data for this section which we are building
/// up for emission to the file.
DataBuffer SectionData;
/// RelocBuffer - A buffer to hold the mach-o relocations before we write
/// them out at the appropriate location in the file.
DataBuffer RelocBuffer;
/// Relocations - The relocations that we have encountered so far in this
/// section that we will need to convert to MachORelocation entries when
/// the file is written.
std::vector<MachineRelocation> Relocations;
// Constants for the section types (low 8 bits of flags field)
// see <mach-o/loader.h>
enum { S_REGULAR = 0,
// regular section
S_ZEROFILL = 1,
// zero fill on demand section
S_CSTRING_LITERALS = 2,
// section with only literal C strings
S_4BYTE_LITERALS = 3,
// section with only 4 byte literals
S_8BYTE_LITERALS = 4,
// section with only 8 byte literals
S_LITERAL_POINTERS = 5,
// section with only pointers to literals
S_NON_LAZY_SYMBOL_POINTERS = 6,
// section with only non-lazy symbol pointers
S_LAZY_SYMBOL_POINTERS = 7,
// section with only lazy symbol pointers
S_SYMBOL_STUBS = 8,
// section with only symbol stubs
// byte size of stub in the reserved2 field
S_MOD_INIT_FUNC_POINTERS = 9,
// section with only function pointers for initialization
S_MOD_TERM_FUNC_POINTERS = 10,
// section with only function pointers for termination
S_COALESCED = 11,
// section contains symbols that are coalesced
S_GB_ZEROFILL = 12,
// zero fill on demand section (that can be larger than 4GB)
S_INTERPOSING = 13,
// section with only pairs of function pointers for interposing
S_16BYTE_LITERALS = 14
// section with only 16 byte literals
};
// Constants for the section flags (high 24 bits of flags field)
// see <mach-o/loader.h>
enum { S_ATTR_PURE_INSTRUCTIONS = 1 << 31,
// section contains only true machine instructions
S_ATTR_NO_TOC = 1 << 30,
// section contains coalesced symbols that are not to be in a
// ranlib table of contents
S_ATTR_STRIP_STATIC_SYMS = 1 << 29,
// ok to strip static symbols in this section in files with the
// MY_DYLDLINK flag
S_ATTR_NO_DEAD_STRIP = 1 << 28,
// no dead stripping
S_ATTR_LIVE_SUPPORT = 1 << 27,
// blocks are live if they reference live blocks
S_ATTR_SELF_MODIFYING_CODE = 1 << 26,
// used with i386 code stubs written on by dyld
S_ATTR_DEBUG = 1 << 25,
// a debug section
S_ATTR_SOME_INSTRUCTIONS = 1 << 10,
// section contains some machine instructions
S_ATTR_EXT_RELOC = 1 << 9,
// section has external relocation entries
S_ATTR_LOC_RELOC = 1 << 8
// section has local relocation entries
};
/// cmdSize - This routine returns the size of the MachOSection as written
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
unsigned cmdSize(bool is64Bit) const {
if (is64Bit)
return 7 * sizeof(uint32_t) + 2 * sizeof(uint64_t) + 32;
else
return 9 * sizeof(uint32_t) + 32; // addresses only 32 bits
}
MachOSection(const std::string &seg, const std::string &sect)
: sectname(sect), segname(seg), addr(0), size(0), offset(0), align(2),
reloff(0), nreloc(0), flags(0), reserved1(0), reserved2(0),
reserved3(0) { }
}; // end struct MachOSection
/// MachOSymTab - This struct contains information about the offsets and
/// size of symbol table information.
/// segment.
struct MachODySymTab {
uint32_t cmd; // LC_DYSYMTAB
uint32_t cmdsize; // sizeof( MachODySymTab )
uint32_t ilocalsym; // index to local symbols
uint32_t nlocalsym; // number of local symbols
uint32_t iextdefsym; // index to externally defined symbols
uint32_t nextdefsym; // number of externally defined symbols
uint32_t iundefsym; // index to undefined symbols
uint32_t nundefsym; // number of undefined symbols
uint32_t tocoff; // file offset to table of contents
uint32_t ntoc; // number of entries in table of contents
uint32_t modtaboff; // file offset to module table
uint32_t nmodtab; // number of module table entries
uint32_t extrefsymoff; // offset to referenced symbol table
uint32_t nextrefsyms; // number of referenced symbol table entries
uint32_t indirectsymoff; // file offset to the indirect symbol table
uint32_t nindirectsyms; // number of indirect symbol table entries
uint32_t extreloff; // offset to external relocation entries
uint32_t nextrel; // number of external relocation entries
uint32_t locreloff; // offset to local relocation entries
uint32_t nlocrel; // number of local relocation entries
// Constants for the cmd field
// see <mach-o/loader.h>
enum { LC_DYSYMTAB = 0x0B // dynamic link-edit symbol table info
};
MachODySymTab() : cmd(LC_DYSYMTAB), cmdsize(20 * sizeof(uint32_t)),
ilocalsym(0), nlocalsym(0), iextdefsym(0), nextdefsym(0),
iundefsym(0), nundefsym(0), tocoff(0), ntoc(0), modtaboff(0),
nmodtab(0), extrefsymoff(0), nextrefsyms(0), indirectsymoff(0),
nindirectsyms(0), extreloff(0), nextrel(0), locreloff(0), nlocrel(0) { }
};
} // end namespace llvm
#endif
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