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[CHANGED] updated comments, removed some unnecessary code

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Sami Samhuri 2009-06-26 15:37:48 -07:00
parent a7a30b329a
commit 1877d7e4d7
1 changed files with 27 additions and 17 deletions
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36
asm/machofile.rb
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@ -18,11 +18,6 @@ module Assembler
@data = [] # Blobs of data that appear at the end of the file. @data = [] # Blobs of data that appear at the end of the file.
# (text, data, symtab, ...) # (text, data, symtab, ...)
@current_segment = nil # An alias for the last defined segment. @current_segment = nil # An alias for the last defined segment.
# Leave room for __PAGEZERO, a single 0x1000 (4kb) page at 0x0. The
# __TEXT segment starts at 0x1000 and contains mach headers and load
# commands.
@text_offset = 0x1000
end end
@ -231,12 +226,15 @@ module Assembler
# TODO sanity checks, e.g. assert(@header[:ncmds] == @load_command.size) # TODO sanity checks, e.g. assert(@header[:ncmds] == @load_command.size)
# ... perhaps an option to recalculate such data as well. # ... perhaps an option to recalculate such data as well.
# Now that we have all the pieces of the file defined we can calculate
# the file offsets of segments and sections.
recalculate_offsets recalculate_offsets
# |------------------| # |------------------|
# | Mach Header | # | Mach Header | Part 1
# |------------------| # |------------------|
# | Segment 1 | # | Segment 1 | Part 2
# | Section 1 | --- # | Section 1 | ---
# | Section 2 | --|-- # | Section 2 | --|--
# | ... | | | # | ... | | |
@ -247,16 +245,23 @@ module Assembler
# | ... | | | # | ... | | |
# | [Symtab cmd] | | | # | [Symtab cmd] | | |
# |------------------| | | # |------------------| | |
# | Section data 1 | <-- | # | Section data 1 | <-- | Part 3
# | Section data 2 | <---- # | Section data 2 | <----
# | ... | # | ... |
# | [Symtab data] | # | [Symtab data] |
# |------------------| # |------------------|
###################################
# Mach-O file Part 1: Mach Header #
###################################
# dump the mach header
obj = @header.serialize obj = @header.serialize
#####################################
# Mach-O file Part 2: Load Commands #
#####################################
# dump each load command (which include the section headers under them) # dump each load command (which include the section headers under them)
obj += @load_commands.map do |cmd| obj += @load_commands.map do |cmd|
sects = @sections[cmd[:segname]] rescue [] sects = @sections[cmd[:segname]] rescue []
@ -265,19 +270,24 @@ module Assembler
end end
end.join end.join
# and finally dump the blobs at the end
###################################
# Mach-O file Part 3: Binary data #
###################################
obj += @data.join obj += @data.join
return obj return obj
end end
# Update the file offsets in SegmentCommand, SymtabCommand, and Section structs. # Update the file offsets in segments and sections.
def recalculate_offsets def recalculate_offsets
# Maintain the offset into the the file. This is used to update # Maintain the offset into the the file on disk. This is used
# the various structures. # to update the various structures.
offset = @header.bytesize offset = @header.bytesize
# First pass over load commands. Most sizes are filled in here. # First pass over load commands. Most sizes are filled in here.