Class: SyntaxTree::YARV::Disassembler

Inherits:
Object
  • Object
show all
Defined in:
lib/syntax_tree/yarv/disassembler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Disassembler

Returns a new instance of Disassembler.



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 10

def initialize
  @output = StringIO.new
  @queue = []

  @current_prefix = ""
  @current_iseq = nil
end

Instance Attribute Details

#current_iseq ⇒ Object

Returns the value of attribute current_iseq.



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 8

def current_iseq
  @current_iseq
end

#current_prefix ⇒ Object (readonly)

Returns the value of attribute current_prefix.



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 7

def current_prefix
  @current_prefix
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 6

def output
  @output
end

#queue ⇒ Object (readonly)

Returns the value of attribute queue.



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 6

def queue
  @queue
end

Instance Method Details

#calldata(value) ⇒ Object

Helpers for various instructions



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 22

def calldata(value)
  flag_names = []
  flag_names << :ARGS_SPLAT if value.flag?(CallData::CALL_ARGS_SPLAT)
  if value.flag?(CallData::CALL_ARGS_BLOCKARG)
    flag_names << :ARGS_BLOCKARG
  end
  flag_names << :FCALL if value.flag?(CallData::CALL_FCALL)
  flag_names << :VCALL if value.flag?(CallData::CALL_VCALL)
  flag_names << :ARGS_SIMPLE if value.flag?(CallData::CALL_ARGS_SIMPLE)
  flag_names << :BLOCKISEQ if value.flag?(CallData::CALL_BLOCKISEQ)
  flag_names << :KWARG if value.flag?(CallData::CALL_KWARG)
  flag_names << :KW_SPLAT if value.flag?(CallData::CALL_KW_SPLAT)
  flag_names << :TAILCALL if value.flag?(CallData::CALL_TAILCALL)
  flag_names << :SUPER if value.flag?(CallData::CALL_SUPER)
  flag_names << :ZSUPER if value.flag?(CallData::CALL_ZSUPER)
  flag_names << :OPT_SEND if value.flag?(CallData::CALL_OPT_SEND)
  flag_names << :KW_SPLAT_MUT if value.flag?(CallData::CALL_KW_SPLAT_MUT)

  parts = []
  parts << "mid:#{value.method}" if value.method
  parts << "argc:#{value.argc}"
  parts << "kw:[#{value.kw_arg.join(", ")}]" if value.kw_arg
  parts << flag_names.join("|") if flag_names.any?

  "<calldata!#{parts.join(", ")}>"
end

#enqueue(iseq) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 49

def enqueue(iseq)
  queue << iseq
end

#event(name) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 53

def event(name)
  case name
  when :RUBY_EVENT_B_CALL
    "Bc"
  when :RUBY_EVENT_B_RETURN
    "Br"
  when :RUBY_EVENT_CALL
    "Ca"
  when :RUBY_EVENT_CLASS
    "Cl"
  when :RUBY_EVENT_END
    "En"
  when :RUBY_EVENT_LINE
    "Li"
  when :RUBY_EVENT_RETURN
    "Re"
  else
    raise "Unknown event: #{name}"
  end
end

#format! ⇒ Object

Main entrypoint



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 103

def format!
  while (@current_iseq = queue.shift)
    output << "\n" if output.pos > 0
    format_iseq(@current_iseq)
  end

  output.string
end

#inline_storage(cache) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 74

def inline_storage(cache)
  "<is:#{cache}>"
end

#instruction(name, operands = []) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 78

def instruction(name, operands = [])
  operands.empty? ? name : "%-38s %s" % [name, operands.join(", ")]
end

#label(value) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 82

def label(value)
  value.name["label_".length..]
end

#local(index, explicit: nil, implicit: nil) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 86

def local(index, explicit: nil, implicit: nil)
  current = current_iseq
  (explicit || implicit).times { current = current.parent_iseq }

  value = "#{current.local_table.name_at(index)}@#{index}"
  value << ", #{explicit}" if explicit
  value
end

#object(value) ⇒ Object 



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# File 'lib/syntax_tree/yarv/disassembler.rb', line 95

def object(value)
  value.inspect
end