Class: RubyVM::RJIT::CPointer::Pointer

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_vm/rjit/c_pointer.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(addr, type) ⇒ Pointer

Returns a new instance of Pointer.

Parameters:

  • addr (Integer)
  • type (Class) —

    RubyVM::RJIT::CType::*



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 280

def initialize(addr, type)
  @addr = addr
  @type = type
end

Instance Attribute Details

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 276

def type
  @type
end

Class Method Details

.define(block) ⇒ Object 



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 321

def self.define(block)
  Class.new(self) do
    define_method(:initialize) do |addr|
      super(addr, block.call)
    end

    # Type-level []=: Used by struct fields
    # @param addr [Integer]
    # @param value [Integer, RubyVM::RJIT::CPointer::Struct] an address itself, or an object that return an address with to_i
    define_singleton_method(:[]=) do |addr, value|
      value = value.to_i
      Fiddle::Pointer.new(addr)[0, Fiddle::SIZEOF_VOIDP] = [value].pack(Fiddle::PackInfo::PACK_MAP[Fiddle::TYPE_VOIDP])
    end
  end
end

Instance Method Details

#* ⇒ Object

Dereference



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 292

def *
  return nil if dest_addr == 0
  @type.new(dest_addr)
end

#+(index) ⇒ Object

Move addr to addess this pointer like an array

Raises:

  • (ArgumentError) 


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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 286

def +(index)
  raise ArgumentError unless index.is_a?(Integer)
  Pointer.new(@addr + index * Fiddle::SIZEOF_VOIDP, @type)
end

#[](index) ⇒ Object

Array access



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 298

def [](index)
  (self + index).*
end

#[]=(index, value) ⇒ Object

Array set

Parameters:



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 305

def []=(index, value)
  Fiddle::Pointer.new(@addr + index * Fiddle::SIZEOF_VOIDP)[0, Fiddle::SIZEOF_VOIDP] =
    [value.to_i].pack(Fiddle::PackInfo::PACK_MAP[Fiddle::TYPE_VOIDP])
end

#to_i ⇒ Object

Get a raw address



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# File 'lib/ruby_vm/rjit/c_pointer.rb', line 311

def to_i
  @addr
end