85 lines
2.4 KiB
Ruby
85 lines
2.4 KiB
Ruby
module Asm
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class AstAssembler
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def initialize(asm_arch)
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@asm_arch = asm_arch
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@symbols = {}
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@inst_label_context = {}
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@asm = Asm::Assembler.new
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end
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def assembler
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@asm
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end
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def load_ast(ast)
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label_breadcrumb = []
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ast.children.each do |cmd|
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if (cmd.is_a?(Asm::LabelNode))
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m = /^\/+/.match(cmd.name)
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count = m ? m[0].length : 0
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label_breadcrumb = label_breadcrumb[0,count]
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label_breadcrumb << cmd.name[count..-1]
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@asm.add_object object_for_label(label_breadcrumb.join('/'))
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elsif (cmd.is_a?(Asm::InstructionNode))
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inst = @asm_arch::Instruction.new(cmd, self)
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@asm.add_object inst
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@inst_label_context[inst] = label_breadcrumb
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elsif (cmd.is_a?(Asm::DirectiveNode))
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if (cmd.name == 'global')
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symbol_for_label(cmd.value)[:linkage] = Elf::Constants::STB_GLOBAL
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elsif (cmd.name == 'extern')
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object_for_label(cmd.value).extern!
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elsif (cmd.name == 'hexdata')
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bytes = cmd.value.strip.split(/\s+/).map do |hex|
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hex.to_i(16)
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end.pack('C*')
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@asm.add_object Asm::DataObject.new(bytes)
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elsif (cmd.name == "asciz")
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str = eval(cmd.value) + "\x00"
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@asm.add_object Asm::DataObject.new(str)
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elsif (defined?(Asm::Arm) and cmd.name == 'addrtable')
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@asm.add_object Asm::Arm::AddrTableObject.new
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else
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raise Asm::AssemblyError.new('unknown directive', cmd)
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end
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end
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end
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end
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# instruction is user for label context
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def symbol_for_label(name, instruction=nil)
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if (instruction)
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context = @inst_label_context[instruction]
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m = /^(\/*)(.+)/.match(name)
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breadcrumb = context[0,m[1].length]
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breadcrumb << m[2]
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qual_name = breadcrumb.join('/')
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else
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qual_name = name
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end
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if (not @symbols[qual_name])
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@symbols[name] = {:label => Asm::LabelObject.new, :linkage => Elf::Constants::STB_LOCAL, :name => qual_name}
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end
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@symbols[qual_name]
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end
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def object_for_label(name, instruction=nil)
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symbol_for_label(name, instruction)[:label]
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end
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def assemble(io)
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@asm.assemble io
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end
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def symbols
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@symbols.values
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end
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def relocations
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@asm.relocations
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end
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end
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end |