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Document ELFShim.

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This commit is contained in:
Markus Reiter 2020-08-25 00:11:59 +02:00
parent dbfc6dc7a5
commit 4304fa048e
1 changed files with 23 additions and 0 deletions
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23
Library/Homebrew/os/linux/elf.rb
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@ -1,24 +1,42 @@
# frozen_string_literal: true # frozen_string_literal: true
# {Pathname} extension for dealing with ELF files.
#
# @see https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header # @see https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header
#
# @api private
module ELFShim module ELFShim
MAGIC_NUMBER_OFFSET = 0 MAGIC_NUMBER_OFFSET = 0
private_constant :MAGIC_NUMBER_OFFSET
MAGIC_NUMBER_ASCII = "\x7fELF" MAGIC_NUMBER_ASCII = "\x7fELF"
private_constant :MAGIC_NUMBER_ASCII
OS_ABI_OFFSET = 0x07 OS_ABI_OFFSET = 0x07
private_constant :OS_ABI_OFFSET
OS_ABI_SYSTEM_V = 0 OS_ABI_SYSTEM_V = 0
private_constant :OS_ABI_SYSTEM_V
OS_ABI_LINUX = 3 OS_ABI_LINUX = 3
private_constant :OS_ABI_LINUX
TYPE_OFFSET = 0x10 TYPE_OFFSET = 0x10
private_constant :TYPE_OFFSET
TYPE_EXECUTABLE = 2 TYPE_EXECUTABLE = 2
private_constant :TYPE_EXECUTABLE
TYPE_SHARED = 3 TYPE_SHARED = 3
private_constant :TYPE_SHARED
ARCHITECTURE_OFFSET = 0x12 ARCHITECTURE_OFFSET = 0x12
private_constant :ARCHITECTURE_OFFSET
ARCHITECTURE_I386 = 0x3 ARCHITECTURE_I386 = 0x3
private_constant :ARCHITECTURE_I386
ARCHITECTURE_POWERPC = 0x14 ARCHITECTURE_POWERPC = 0x14
private_constant :ARCHITECTURE_POWERPC
ARCHITECTURE_ARM = 0x28 ARCHITECTURE_ARM = 0x28
private_constant :ARCHITECTURE_ARM
ARCHITECTURE_X86_64 = 0x62 ARCHITECTURE_X86_64 = 0x62
private_constant :ARCHITECTURE_X86_64
ARCHITECTURE_AARCH64 = 0xB7 ARCHITECTURE_AARCH64 = 0xB7
private_constant :ARCHITECTURE_AARCH64
def read_uint8(offset) def read_uint8(offset)
read(1, offset).unpack1("C") read(1, offset).unpack1("C")
@ -86,6 +104,9 @@ module ELFShim
@dynamic_elf = patchelf_patcher.elf.segment_by_type(:DYNAMIC).present? @dynamic_elf = patchelf_patcher.elf.segment_by_type(:DYNAMIC).present?
end end
# Helper class for reading metadata from an ELF file.
#
# @api private
class Metadata class Metadata
attr_reader :path, :dylib_id, :dylibs attr_reader :path, :dylib_id, :dylibs
@ -125,6 +146,7 @@ module ELFShim
[patcher.soname, patcher.needed] [patcher.soname, patcher.needed]
end end
end end
private_constant :Metadata
def rpath_using_patchelf_rb def rpath_using_patchelf_rb
patchelf_patcher.runpath || patchelf_patcher.rpath patchelf_patcher.runpath || patchelf_patcher.rpath
@ -138,6 +160,7 @@ module ELFShim
def metadata def metadata
@metadata ||= Metadata.new(self) @metadata ||= Metadata.new(self)
end end
private :metadata
def dylib_id def dylib_id
metadata.dylib_id metadata.dylib_id