Class: Indis::MachO::SectionSubCommand

Inherits:
Command
  • Object
show all
Defined in:
lib/indis-macho/command.rb

Overview

LC_SEGMENT.sub

Constant Summary collapse

SECTION_TYPE_MASK = 
0x000000ff
SECTION_ATTRIBUTES_MASK = 
0xffffff00
SECTION_TYPE = 
{
  0x00 => :S_REGULAR,                             # regular section
  0x01 => :S_ZEROFILL,                            # zero-fill on demand section
  0x02 => :S_CSTRING_LITERALS,                    # section with only literal C strings
  0x03 => :S_4BYTE_LITERALS,                      # section with only 4 byte literals
  0x04 => :S_8BYTE_LITERALS,                      # section with only 8 byte literals
  0x05 => :S_LITERAL_POINTERS,                    # section with only pointers to literals
  0x06 => :S_NON_LAZY_SYMBOL_POINTERS,            # section with only non-lazy symbol pointers
  0x07 => :S_LAZY_SYMBOL_POINTERS,                # section with only lazy symbol pointers
  0x08 => :S_SYMBOL_STUBS,                        # section with only symbol stubs (s.a. byte size of stub in the reserved2)
  0x09 => :S_MOD_INIT_FUNC_POINTERS,              # section with only function pointers for initialization
  0x0a => :S_MOD_TERM_FUNC_POINTERS,              # section with only function pointers for termination
  0x0b => :S_COALESCED,                           # section contains symbols that are to be coalesced
  0x0c => :S_GB_ZEROFILL,                         # zero fill on demand section (>4Gb)
  0x0d => :S_INTERPOSING,                         # section with only pairs of function pointers for interposing
  0x0e => :S_16BYTE_LITERALS,                     # section with only 16 byte literals
  0x0f => :S_DTRACE_DOF,                          # section contains DTrace Object Format
  0x10 => :S_LAZY_DYLIB_SYMBOL_POINTERS,          # section with only lazy symbol pointers to lazy loaded dylibs
  0x11 => :S_THREAD_LOCAL_REGULAR,                # template of initial values for TLVs
  0x12 => :S_THREAD_LOCAL_ZEROFILL,               # template of initial values for TLVs (zero-filled on demand?)
  0x13 => :S_THREAD_LOCAL_VARIABLES,              # TLV descriptors
  0x14 => :S_THREAD_LOCAL_VARIABLE_POINTERS,      # pointers to TLV descriptors
  0x15 => :S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, # functions to call to initialize TLV values
}
SECTION_ATTRIBUTES = 
{
  0x80000000 => :S_ATTR_PURE_INSTRUCTIONS,   # section contains only true machine instructions
  0x40000000 => :S_ATTR_NO_TOC,              # section contains coalesced symbols that are not to be in a ranlib table of contents
  0x20000000 => :S_ATTR_STRIP_STATIC_SYMS,   # ok to strip static symbols in this section in files with the MH_DYLDLINK flag
  0x10000000 => :S_ATTR_NO_DEAD_STRIP,       # no dead stripping
  0x08000000 => :S_ATTR_LIVE_SUPPORT,        # blocks are live if they reference live blocks
  0x04000000 => :S_ATTR_SELF_MODIFYING_CODE, # Used with i386 code stubs written on by dyld
  # s.a. S_ATTR_DEBUG & friends in loader.h
}

Constants inherited from Command

Command::CMD, Command::CMD_CLASS, Command::LC_REQ_DYLD

Instance Attribute Summary collapse

Attributes inherited from Command

#cmd, #length

Instance Method Summary collapse

Methods inherited from Command

class_of_command

Constructor Details

#initialize(payload) ⇒ SectionSubCommand

Returns a new instance of SectionSubCommand.



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# File 'lib/indis-macho/command.rb', line 186

def initialize(payload)
  process(payload)
  @type = SECTION_TYPE[@flags & SECTION_TYPE_MASK]
  atr = @falgs & SECTION_ATTRIBUTES_MASK
  @attributes = SECTION_ATTRIBUTES.map { |k,v| (atr & k == k) ? v : nil }.compact
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



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# File 'lib/indis-macho/command.rb', line 146

def attributes
  @attributes
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/indis-macho/command.rb', line 145

def index
  @index
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/indis-macho/command.rb', line 146

def type
  @type
end