70 lines
2.0 KiB
Ruby
70 lines
2.0 KiB
Ruby
require_relative "stream_writer"
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require_relative 'object_file'
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require_relative 'symbol_table_section'
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require_relative 'text_section'
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require_relative 'string_table_section'
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module Elf
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class ObjectWriter
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def initialize( machine , objects )
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@machine = machine
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@objects = objects
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target = Elf::Constants::TARGET_ARM
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@object = Elf::ObjectFile.new(target)
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sym_strtab = Elf::StringTableSection.new(".strtab")
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@object.add_section sym_strtab
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@symbol_table = Elf::SymbolTableSection.new(".symtab", sym_strtab)
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@object.add_section @symbol_table
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@text = Elf::TextSection.new(".text")
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@object.add_section @text
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assembler = Risc::Assembler.new(@machine , @objects)
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set_text assembler.write_as_string
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# for debug add labels for labels
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Parfait.object_space.each_type do |type|
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type.methods.each do |f|
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f.instructions.each_label do |label|
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add_symbol "#{type.name}::#{f.name}:#{label.name}" , Positioned.position(label)
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end
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end
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end
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@objects.each do |id,slot|
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next if slot.is_a?(Parfait::BinaryCode)
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if( slot.respond_to? :sof_reference_name )
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label = "#{slot.sof_reference_name}"
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else
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label = "#{slot.class.name}::#{Positioned.position(slot).to_s(16)}"
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end
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label += "=#{slot}" if slot.is_a?(Symbol) or slot.is_a?(String)
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add_symbol label , Positioned.position(slot)
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if slot.is_a?(Parfait::TypedMethod)
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add_symbol slot.name.to_s , Positioned.position(slot.binary)
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end
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end
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end
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attr_reader :text
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def set_text(text)
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@text.text = text
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add_symbol "_start", 0
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end
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def add_symbol(name, offset, linkage = Elf::Constants::STB_GLOBAL)
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return add_symbol( name + "_" , offset ) if @symbol_table.has_name(name)
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@symbol_table.add_func_symbol name, offset, @text, linkage
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end
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def save(filename)
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to = File.open(filename, 'wb')
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@object.write to
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to.close
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end
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end
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end
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