DoxigAlpha
std › macho › LoadCommandIterator › LoadCommand › cast

cast

Function parameters

Parameters

#
Cmd:type

Type definitions in this namespace

Types

#
uuid_command
The uuid load command contains a single 128-bit unique random number that
version_min_command
The version_min_command contains the min OS version on which this
source_version_command
The source_version_command is an optional load command containing
build_version_command
The build_version_command contains the min OS version on which this
entry_point_command
The entry_point_command is a replacement for thread_command.
symtab_command
The symtab_command contains the offsets and sizes of the link-edit 4.3BSD
dysymtab_command
This is the second set of the symbolic information which is used to support
linkedit_data_command
The linkedit_data_command contains the offsets and sizes of a blob
dyld_info_command
The dyld_info_command contains the file offsets and sizes of
dylinker_command
A program that uses a dynamic linker contains a dylinker_command to identify
dylib_command
A dynamically linked shared library (filetype == MH_DYLIB in the mach header)
dylib
Dynamically linked shared libraries are identified by two things.
rpath_command
The rpath_command contains a path which at runtime should be added to the current
segment_command
The segment load command indicates that a part of this file is to be
segment_command_64
The 64-bit segment load command indicates that a part of this file is to be
section
A segment is made up of zero or more sections.
relocation_info
Format of a relocation entry of a Mach-O file.
CodeDirectory
This CodeDirectory is tailored specifically at version 0x20400.
BlobIndex
Structure of an embedded-signature SuperBlob
SuperBlob
This structure is followed by GenericBlobs in no particular
data_in_code_entry
The LC_DATA_IN_CODE load commands uses a linkedit_data_command

After MacOS X 10.1 when a new load command is added that is required to be

Values

#
LC_REQ_DYLD
After MacOS X 10.1 when a new load command is added that is required to be
MH_MAGIC
the mach magic number
MH_CIGAM
NXSwapInt(MH_MAGIC)
MH_MAGIC_64
the 64-bit mach magic number
MH_CIGAM_64
NXSwapInt(MH_MAGIC_64)
MH_OBJECT
relocatable object file
MH_EXECUTE
demand paged executable file
MH_FVMLIB
fixed VM shared library file
MH_CORE
core file
MH_PRELOAD
preloaded executable file
MH_DYLIB
dynamically bound shared library
MH_DYLINKER
dynamic link editor
MH_BUNDLE
dynamically bound bundle file
MH_DYLIB_STUB
shared library stub for static linking only, no section contents
MH_DSYM
companion file with only debug sections
MH_KEXT_BUNDLE
x86_64 kexts
MH_NOUNDEFS
the object file has no undefined references
MH_INCRLINK
the object file is the output of an incremental link against a base file and can't be link edited again
MH_DYLDLINK
the object file is input for the dynamic linker and can't be statically link edited again
MH_BINDATLOAD
the object file's undefined references are bound by the dynamic linker when loaded.
MH_PREBOUND
the file has its dynamic undefined references prebound.
MH_SPLIT_SEGS
the file has its read-only and read-write segments split
MH_LAZY_INIT
the shared library init routine is to be run lazily via catching memory faults to its writeable segments (obsolete)
MH_TWOLEVEL
the image is using two-level name space bindings
MH_FORCE_FLAT
the executable is forcing all images to use flat name space bindings
MH_NOMULTIDEFS
this umbrella guarantees no multiple definitions of symbols in its sub-images so the two-level namespace hints can always be used.
MH_NOFIXPREBINDING
do not have dyld notify the prebinding agent about this executable
MH_PREBINDABLE
the binary is not prebound but can have its prebinding redone.
MH_ALLMODSBOUND
indicates that this binary binds to all two-level namespace modules of its dependent libraries.
MH_SUBSECTIONS_VIA_SYMBOLS
safe to divide up the sections into sub-sections via symbols for dead code stripping
MH_CANONICAL
the binary has been canonicalized via the unprebind operation
MH_WEAK_DEFINES
the final linked image contains external weak symbols
MH_BINDS_TO_WEAK
the final linked image uses weak symbols
MH_ALLOW_STACK_EXECUTION
When this bit is set, all stacks in the task will be given stack execution privilege.
MH_ROOT_SAFE
When this bit is set, the binary declares it is safe for use in processes with uid zero
MH_SETUID_SAFE
When this bit is set, the binary declares it is safe for use in processes when issetugid() is true
MH_NO_REEXPORTED_DYLIBS
When this bit is set on a dylib, the static linker does not need to examine dependent dylibs to see if any are re-exported
MH_PIE
When this bit is set, the OS will load the main executable at a random address.
MH_DEAD_STRIPPABLE_DYLIB
Only for use on dylibs.
MH_HAS_TLV_DESCRIPTORS
Contains a section of type S_THREAD_LOCAL_VARIABLES
MH_NO_HEAP_EXECUTION
When this bit is set, the OS will run the main executable with a non-executable heap even on platforms (e.g.
MH_APP_EXTENSION_SAFE
The code was linked for use in an application extension.
MH_NLIST_OUTOFSYNC_WITH_DYLDINFO
The external symbols listed in the nlist symbol table do not include all the symbols listed in the dyld info.
MH_SIM_SUPPORT
Allow LC_MIN_VERSION_MACOS and LC_BUILD_VERSION load commands with the platforms macOS, iOSMac, iOSSimulator, tvOSSimulator and watchOSSimulator.
MH_DYLIB_IN_CACHE
Only for use on dylibs.
FAT_MAGIC
the fat magic number
FAT_CIGAM
NXSwapLong(FAT_MAGIC)
FAT_MAGIC_64
the 64-bit fat magic number
FAT_CIGAM_64
NXSwapLong(FAT_MAGIC_64)
SG_HIGHVM
Segment flags
SG_FVMLIB
This segment is the VM that is allocated by a fixed VM library, for overlap checking in
SG_NORELOC
This segment has nothing that was relocated in it and nothing relocated to it, that is
SG_PROTECTED_VERSION_1
This segment is protected.
SG_READ_ONLY
This segment is made read-only after fixups
SECTION_TYPE
The flags field of a section structure is separated into two parts a section
SECTION_ATTRIBUTES
24 section attributes
S_REGULAR
regular section
S_ZEROFILL
zero fill on demand section
S_CSTRING_LITERALS
section with only literal C string
S_4BYTE_LITERALS
section with only 4 byte literals
S_8BYTE_LITERALS
section with only 8 byte literals
S_LITERAL_POINTERS
section with only pointers to
N_STAB
if any of these bits set, a symbolic debugging entry
N_PEXT
private external symbol bit
N_TYPE
mask for the type bits
N_EXT
external symbol bit, set for external symbols
N_UNDF
symbol is undefined
N_ABS
symbol is absolute
N_SECT
symbol is defined in the section number given in n_sect
N_PBUD
symbol is undefined and the image is using a prebound
N_INDR
symbol is defined to be the same as another symbol; the n_value
N_GSYM
global symbol: name,,NO_SECT,type,0
N_FNAME
procedure name (f77 kludge): name,,NO_SECT,0,0
N_FUN
procedure: name,,n_sect,linenumber,address
N_STSYM
static symbol: name,,n_sect,type,address
N_LCSYM
.lcomm symbol: name,,n_sect,type,address
N_BNSYM
begin nsect sym: 0,,n_sect,0,address
N_AST
AST file path: name,,NO_SECT,0,0
N_OPT
emitted with gcc2_compiled and in gcc source
N_RSYM
register sym: name,,NO_SECT,type,register
N_SLINE
src line: 0,,n_sect,linenumber,address
N_ENSYM
end nsect sym: 0,,n_sect,0,address
N_SSYM
structure elt: name,,NO_SECT,type,struct_offset
N_SO
source file name: name,,n_sect,0,address
N_OSO
object file name: name,,0,0,st_mtime
N_LSYM
local sym: name,,NO_SECT,type,offset
N_BINCL
include file beginning: name,,NO_SECT,0,sum
N_SOL
#included file name: name,,n_sect,0,address
N_PARAMS
compiler parameters: name,,NO_SECT,0,0
N_VERSION
compiler version: name,,NO_SECT,0,0
N_OLEVEL
compiler -O level: name,,NO_SECT,0,0
N_PSYM
parameter: name,,NO_SECT,type,offset
N_EINCL
include file end: name,,NO_SECT,0,0
N_ENTRY
alternate entry: name,,n_sect,linenumber,address
N_LBRAC
left bracket: 0,,NO_SECT,nesting level,address
N_EXCL
deleted include file: name,,NO_SECT,0,sum
N_RBRAC
right bracket: 0,,NO_SECT,nesting level,address
N_BCOMM
begin common: name,,NO_SECT,0,0
N_ECOMM
end common: name,,n_sect,0,0
N_ECOML
end common (local name): 0,,n_sect,0,address
N_LENG
second stab entry with length information
S_NON_LAZY_SYMBOL_POINTERS
section with only non-lazy symbol pointers
S_LAZY_SYMBOL_POINTERS
section with only lazy symbol pointers
S_SYMBOL_STUBS
section with only symbol stubs, byte size of stub in the reserved2 field
S_MOD_INIT_FUNC_POINTERS
section with only function pointers for initialization
S_MOD_TERM_FUNC_POINTERS
section with only function pointers for termination
S_COALESCED
section contains symbols that are to be coalesced
S_GB_ZEROFILL
zero fill on demand section (that can be larger than 4 gigabytes)
S_INTERPOSING
section with only pairs of function pointers for interposing
S_16BYTE_LITERALS
section with only 16 byte literals
S_DTRACE_DOF
section contains DTrace Object Format
S_LAZY_DYLIB_SYMBOL_POINTERS
section with only lazy symbol pointers to lazy loaded dylibs
S_ATTR_DEBUG
a debug section
S_ATTR_PURE_INSTRUCTIONS
section contains only true machine instructions
S_ATTR_NO_TOC
section contains coalesced symbols that are not to be in a ranlib
S_ATTR_STRIP_STATIC_SYMS
ok to strip static symbols in this section in files with the
S_ATTR_NO_DEAD_STRIP
no dead stripping
S_ATTR_LIVE_SUPPORT
blocks are live if they reference live blocks
S_ATTR_SELF_MODIFYING_CODE
used with x86 code stubs written on by dyld
S_ATTR_SOME_INSTRUCTIONS
section contains some machine instructions
S_ATTR_EXT_RELOC
section has external relocation entries
S_ATTR_LOC_RELOC
section has local relocation entries
S_THREAD_LOCAL_REGULAR
template of initial values for TLVs
S_THREAD_LOCAL_ZEROFILL
template of initial values for TLVs
S_THREAD_LOCAL_VARIABLES
TLV descriptors
S_THREAD_LOCAL_VARIABLE_POINTERS
pointers to TLV descriptors
S_THREAD_LOCAL_INIT_FUNCTION_POINTERS
functions to call to initialize TLV values
S_INIT_FUNC_OFFSETS
32-bit offsets to initializers
CPU_TYPE_X86_64
CPU type targeting 64-bit Intel-based Macs
CPU_TYPE_ARM64
CPU type targeting 64-bit ARM-based Macs
CPU_SUBTYPE_X86_64_ALL
All Intel-based Macs
CPU_SUBTYPE_ARM_ALL
All ARM-based Macs
REFERENCE_FLAG_UNDEFINED_NON_LAZY
This symbol is a reference to an external non-lazy (data) symbol.
REFERENCE_FLAG_UNDEFINED_LAZY
This symbol is a reference to an external lazy symbol—that is, to a function call.
REFERENCE_FLAG_DEFINED
This symbol is defined in this module.
REFERENCE_FLAG_PRIVATE_DEFINED
This symbol is defined in this module and is visible only to modules within this shared library.
REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY
This symbol is defined in another module in this file, is a non-lazy (data) symbol, and is visible
REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY
This symbol is defined in another module in this file, is a lazy (function) symbol, and is visible
REFERENCED_DYNAMICALLY
Must be set for any defined symbol that is referenced by dynamic-loader APIs (such as dlsym and
N_NO_DEAD_STRIP
The N_NO_DEAD_STRIP bit of the n_desc field only ever appears in a
N_DESC_DISCARDED
Used by the dynamic linker at runtime.
N_WEAK_REF
Indicates that this symbol is a weak reference.
N_WEAK_DEF
Indicates that this symbol is a weak definition.
N_SYMBOL_RESOLVER
The N_SYMBOL_RESOLVER bit of the n_desc field indicates that the
CSMAGIC_REQUIREMENT
Single Requirement blob
CSMAGIC_REQUIREMENTS
Requirements vector (internal requirements)
CSMAGIC_CODEDIRECTORY
CodeDirectory blob
CSMAGIC_EMBEDDED_SIGNATURE
embedded form of signature data
CSMAGIC_EMBEDDED_ENTITLEMENTS
Embedded entitlements
CSMAGIC_EMBEDDED_DER_ENTITLEMENTS
Embedded DER encoded entitlements
CSMAGIC_DETACHED_SIGNATURE
Multi-arch collection of embedded signatures
CSMAGIC_BLOBWRAPPER
CMS Signature, among other things
CSSLOT_CODEDIRECTORY
Slot index for CodeDirectory
CSSLOT_ALTERNATE_CODEDIRECTORIES
first alternate CodeDirectory, if any
CSSLOT_ALTERNATE_CODEDIRECTORY_MAX
Max number of alternate CD slots
CSSLOT_SIGNATURESLOT
CMS Signature
CSTYPE_INDEX_REQUIREMENTS
Compat with amfi
CSTYPE_INDEX_ENTITLEMENTS
Compat with amfi
CS_CDHASH_LEN
Always - larger hashes are truncated
CS_HASH_MAX_SIZE
Max size of the hash we'll support
UNWIND_HAS_LSDA
= 0x40000000

Source

Implementation

#
pub fn cast(lc: LoadCommand, comptime Cmd: type) ?Cmd {
    if (lc.data.len < @sizeOf(Cmd)) return null;
    return @as(*align(1) const Cmd, @ptrCast(lc.data.ptr)).*;
}