Class: Idl::DontCareReturnAst

Inherits:
AstNode
  • Object
show all
Includes:
Rvalue
Defined in:
lib/idl/ast.rb

Overview

represents a don’t care return value

for example:

return -;

Instance Method Summary collapse

Constructor Details

#initialize(input, interval) ⇒ DontCareReturnAst

Returns a new instance of DontCareReturnAst.



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# File 'lib/idl/ast.rb', line 3850

def initialize(input, interval)
  super(input, interval, EMPTY_ARRAY)
end

Instance Method Details

#set_expected_type(t) ⇒ Object 



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# File 'lib/idl/ast.rb', line 3878

def set_expected_type(t)
  @expected_type = t
end

#to_idl ⇒ Object 



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# File 'lib/idl/ast.rb', line 3882

def to_idl = "-"

#type(_symtab) ⇒ Type

Return the type of this node

Parameters:

Returns:

  • (Type) —

    The type of the node



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# File 'lib/idl/ast.rb', line 3860

def type(_symtab)
  Type.new(:dontcare)
end

#type_check(_symtab) ⇒ Object 



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# File 'lib/idl/ast.rb', line 3855

def type_check(_symtab)
  # nothing to do!
end

#value(_symtab) ⇒ Integer, Boolean

Return the compile-time-known value of the node

Parameters:

Returns:

  • (Integer) —

    if the compile-time-known value is an integer

  • (Boolean) —

    if the compile-time-known value is a boolean

Raises:



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# File 'lib/idl/ast.rb', line 3865

def value(_symtab)
  internal_error "Must call set_expected_type first" if @expected_type.nil?

  case @expected_type.kind
  when :bits
    0
  when :boolean
    false
  else
    internal_error "Unhandled expected type"
  end
end

#values(symtab) ⇒ Array<Integer>, ... Originally defined in module Rvalue

Return a complete list of possible compile-time-known values of the node, or raise a ValueError if the full list cannot be determined

For most AstNodes, this will just be a single-entry array

Parameters:

  • symtab (SymbolTable) —

    The context for the evaluation

Returns:

  • (Array<Integer>) —

    The complete list of compile-time-known values, when they are integral

  • (Array<Boolean>) —

    The complete list of compile-time-known values, when they are booleans

  • (AstNode::ValueError) —

    if the list of values is not knowable at compile time