Class: Wardite::Store

Inherits:
Object
  • Object
show all
Defined in:
lib/wardite.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(inst) ⇒ Store

Returns a new instance of Store.



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# File 'lib/wardite.rb', line 962

def initialize(inst)
  type_section = inst.type_section
  func_section = inst.function_section
  code_section = inst.code_section

  import_section = inst.import_section
  @funcs = []

  if type_section && func_section && code_section
    import_section.imports.each do |desc|
      callsig = type_section.defined_types[desc.sig_index]
      retsig = type_section.defined_results[desc.sig_index]
      imported_module = inst.import_object[desc.module_name.to_sym]
      if !imported_module
        raise ::NameError, "module #{desc.module_name} not found"
      end
      imported_proc = imported_module[desc.name.to_sym]
      if !imported_proc
        raise ::NameError, "function #{desc.module_name}.#{desc.name} not found"
      end
      
      ext_function = ExternalFunction.new(callsig, retsig, imported_proc)
      self.funcs << ext_function
    end

    func_section.func_indices.each_with_index do |sigindex, findex|
      callsig = type_section.defined_types[sigindex]
      retsig = type_section.defined_results[sigindex]
      codes = code_section.func_codes[findex]
      wasm_function = WasmFunction.new(callsig, retsig, codes)
      idx = self.funcs.size
      wasm_function.findex = idx
      self.funcs << wasm_function
    end
  end

  @memories = []
  memory_section = inst.memory_section
  if memory_section
    memory_section.limits.each do |(min, max)|
      self.memories << Memory.new(min, max)
    end

    data_section = inst.data_section
    if data_section
      data_section.segments.each do |segment|
        if segment.mode != :active
          next
        end
        memory = self.memories[segment.mem_index]
        if !memory
          raise GenericError, "invalid memory index: #{segment.mem_index}"
        end

        data_start = segment.offset
        data_end = segment.offset + segment.data.size
        if data_end > memory.data.size
          raise GenericError, "data too large for memory"
        end

        memory.data[data_start...data_end] = segment.data
      end
    end
  end

  @globals = []
  global_section = inst.global_section
  if global_section
    global_section.globals.each do |g|
      @globals << Global.new do |g2|
        g2.type = g.type
        g2.mutable = g.mutable
        g2.shared = g.shared
        g2.value = g.value
      end
    end
  end

  @tables = []
  @elements = []
  table_section = inst.table_section
  if table_section
    table_section.table_types.each_with_index do |typ, idx|
      init, max = *table_section.table_limits[idx]
      if !init
        raise LoadError, "empty limits"
      end
      table = Table.new(typ, init, max)
      @tables << table
    end
  end

  elem_section = inst.elem_section
  if elem_section
    elem_section.table_indices.each_with_index do |tidx, idx|
      table = @tables[tidx]
      if !table
        raise LoadError, "invalid table index #{tidx}"
      end
      typ = table.type
      offset = elem_section.table_offsets[idx]
      if !offset
        raise LoadError, "invalid element index #{idx}"
      end
      indices = elem_section.element_indices[idx]
      if !indices
        raise LoadError, "invalid element index #{idx}"
      end
      elms = [typ, offset, indices] #: [Symbol, Integer, Array[Integer]]
      @elements << elms
    end
  end

  @elements.each_with_index do |(typ, offset, indices), idx|
    table = @tables[idx]
    if !table
      raise LoadError, "invalid table index #{idx}"          
    end
    indices.each_with_index do |eidx, tidx|
      case typ
      when :funcref
        table.set(offset + tidx, @funcs[eidx])
      when :externref
        raise NotImplementedError, "no support :externref"
      end
    end
  end
end

Instance Attribute Details

#elements ⇒ Object

: Array[[Symbol, Integer, Array]]



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# File 'lib/wardite.rb', line 958

def elements
  @elements
end

#funcs ⇒ Object

: Array



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# File 'lib/wardite.rb', line 948

def funcs
  @funcs
end

#globals ⇒ Object

: Array



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# File 'lib/wardite.rb', line 954

def globals
  @globals
end

#memories ⇒ Object

FIXME: attr_accessor :modules



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# File 'lib/wardite.rb', line 952

def memories
  @memories
end

#tables ⇒ Object

: Array



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# File 'lib/wardite.rb', line 956

def tables
  @tables
end

Instance Method Details

#[](idx) ⇒ Object 



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# File 'lib/wardite.rb', line 1092

def [](idx)
  @funcs[idx]
end