Class: Rlang::Parser::Parser

Inherits:
Object
  • Object
show all
Includes:
Log
Defined in:
lib/rlang/parser.rb

Constant Summary collapse

NIL =

WARNING!! THIS IS A VERY NASTY HACK PRETENDING THAT THIS int VALUE means NIL. It’s totally unsafe of course as an expression could end up evaluating to this value and not be nil at all. But I’m using it for now in the xxxx_with_result_type variants of some parsing methods (if, while,…) NOTE: those variants with result type are NOT the ones used by Rlang right now

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Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Log

included, logger, #logger, logger=

Constructor Details

#initialize(wgenerator, options = {}) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/rlang/parser.rb', line 50

def initialize(wgenerator, options={})
  @wgenerator = wgenerator
  # LIFO of parsed files (stacked by require)
  @requires = []
  config_init(options)
  logger.level = Kernel.const_get("Logger::#{@config[:log_level].upcase}")
  logger.formatter = proc do |severity, datetime, progname, msg|
    loc = caller_locations[3] # skip over the logger call itself
    "#{severity[0]}: #{File.basename(loc.path)}:#{loc.lineno}##{loc.label} > #{msg}\n"
  end
  # reset all persistent objects
  # TODO: change the design so those objects are 
  # stored with the parser instance and not in a
  # class variable
  Global.reset!
  Export.reset!
  DAta.reset!
end

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/rlang/parser.rb', line 48

def config
  @config
end

#source ⇒ Object

Returns the value of attribute source.



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# File 'lib/rlang/parser.rb', line 48

def source
  @source
end

#wgenerator ⇒ Object

Returns the value of attribute wgenerator.



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# File 'lib/rlang/parser.rb', line 48

def wgenerator
  @wgenerator
end

Class Method Details

._reset_toggles ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2307

def self._reset_toggles
  @@export, @@export_name = false, nil
  @@import, @@import_module_name, @@import_function_name = false, nil, nil
end

Instance Method Details

#_build_const_path(node) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2294

def _build_const_path(node)
  logger.debug "Building constant path..."
  const_path = []; n = node
  while n
    rlse node, "expecting a const node (got #{n})" unless n.type == :const
    logger.debug "adding #{n.children.last} to constant path"
    const_path.unshift(n.children.last)
    n = n.children.first
  end
  logger.debug "... #{const_path}"
  const_path
end

#config_init(options) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 69

def config_init(options)
  @config = {}
  @config[:LOADED_FEATURES] = []
  @config[:LOAD_PATH] = []
  @config[:__FILE__] = ''
  @config[:log_level] = 'FATAL'
  @config.merge!(options)
end

#dump ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2312

def dump
  @ast
end

#parse(source, wnode = nil) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 106

def parse(source, wnode=nil)
  if config[:comments]
    ast, comments = ::Parser::CurrentRuby.parse_with_comments(source)
    @associated_comments = ::Parser::Source::Comment.associate(ast, comments)
  else
    ast = ::Parser::CurrentRuby.parse(source)
    @associated_comments = {}
  end

  parse_node(ast, wnode || @wgenerator.root) if ast
end

#parse_args(node, wnode) ⇒ Object

method arguments



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# File 'lib/rlang/parser.rb', line 985

def parse_args(node, wnode)
  # collect method arguments
  node.children.each do |arg_node|
    rlse node, "only regular method argument is supported (got #{arg_node.type})" if arg_node.type != :arg
    # keep track of method arguments. Do not generate wasm code yet
    # as 'arg' directives may later affect argument types (see parse_send)
    wnode.create_marg(arg_node.children.last)
  end
end

#parse_array(node, wnode, keep_eval) ⇒ Object

Example

1, -2, 5

(array

(int 1)
(int -2)
(int 5)

)

When an array literal initializer is used in root or class scope, the array literal is allocated statically. If the initializer is used in a method scope we instantiate a dynamic string object and copy the initial static value in it



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# File 'lib/rlang/parser.rb', line 941

def parse_array(node, wnode, keep_eval)
  # check that all array elements are of type int 
  # this is the only initializer type we support for
  # now. Collect int values.
  array = node.children.collect do |wn|
    rlse node,  "Array initializer can only be of type int (got #{wn}" unless wn.type == :int
    wn.children.last
  end

  if wnode.in_method_scope?
    # allocate array dynamically
    wn_array = @wgenerator.array_dynamic_new(wnode, array)
  else
    # allocate array statically
    wn_array = @wgenerator.array_static_new(wnode, array)
  end
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval

  logger.debug "wn_array:#{wn_array} wtype:#{wn_array.wtype} keep_eval:#{keep_eval}"
  return wn_array
end

#parse_begin(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 247

def parse_begin(node, wnode, keep_eval)
  child_count = node.children.count
  logger.debug "child count: #{child_count}"
  wn = nil
  node.children.each_with_index do |n, idx|
    logger.debug "processing begin node ##{idx}..."
    # A begin block always evaluates to the value of
    # its **last** child except
    if (idx == child_count-1)
      local_keep_eval = keep_eval
    else
      local_keep_eval = false
    end
    logger.debug "node idx: #{idx}/#{child_count-1}, wnode type: #{wnode.type}, keep_eval: #{keep_eval}, local_keep_eval: #{local_keep_eval}"
    wn = parse_node(n, wnode, local_keep_eval)
    logger.debug "in begin: parsing node #{n} gives wnode #{wn&.head}"
  end
  return wn # return last wnode
end

#parse_break(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2255

def parse_break(node, wnode, keep_eval)
  @wgenerator.break(wnode)
end

#parse_casgn(node, wnode, keep_eval) ⇒ Object

Example

MYCONST = 2000

(casgn nil :MYCONST

(int 2000))



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# File 'lib/rlang/parser.rb', line 532

def parse_casgn(node, wnode, keep_eval)
  class_path_node, constant_name, exp_node = *node.children
  const_path = _build_const_path(class_path_node) << constant_name

  # rlse node, "dynamic constant assignment" unless wnode.in_class_scope?
  # unless class_path_node.nil?
  #  rlse node, "constant assignment with class path not supported (got #{class_name_node})"
  # end
  
  # find the scope class
  k = wnode.find_current_class_or_module()

  if wnode.in_method_scope?
    # if exp_node is nil then this is the form of 
    # :casgn that comes from op_asgn
    const = wnode.find_const(const_path)
    if exp_node        
      if const.nil?
        # first constant occurence
        # type cast the constant to the wtype of the expression
        const = wnode.create_const(const_path, nil, 0, WType::DEFAULT)
        k.consts << const
        wn_casgn = @wgenerator.casgn(wnode, const)
        wn_exp = parse_node(exp_node, wn_casgn)
        const.wtype = wn_exp.wtype
      else
        # if const already exists then type cast the 
        # expression to the wtype of the existing const
        wn_casgn = @wgenerator.casgn(wnode, const)
        wn_exp = parse_node(exp_node, wn_casgn)
        @wgenerator.cast(wn_exp, const.wtype, false)
        logger.warn "Already initialized constant #{const.name}"
      end
    else
      rlse node, "Constant #{const_path} not declared before" unless const
      wn_casgn = @wgenerator.casgn(wnode, const)
    end
    # to mimic Ruby push the constant value on stack if needed
    @wgenerator.const(wnode, const) if keep_eval
    return wn_casgn

  elsif wnode.in_class_scope? || wnode.in_root_scope?
    # If we are in class scope
    # then it is a class variable initialization
    # Parse the expression node to see if it's a ixx.const
    # in the end but get rid of it then because we are not
    # executing this code. Just statically initiliazing the 
    # const with the value
    wn_exp = parse_node(exp_node, wnode)
    rlse node, "Constant initializer can only be an int or a constant/class (got #{wn_exp}" \
      unless wn_exp.const?
    if (const = wnode.find_const(const_path))
      logger.warn "already initialized constant #{const.path}"
      const.value = wn_exp.wargs[:value]
    else
      const = wnode.create_const(const_path, wn_exp.wargs[:value], wn_exp.wtype)
      k.consts << const
    end
    wnode.remove_child(wn_exp)
    logger.debug "Constant #{const_path} initialized with value #{const.value} and wtype #{const.wtype}"
    return nil
  else
    rlse node, "Constant can only be defined in method or class scope"
  end
end

#parse_class(node, wnode) ⇒ Object

Example: class Stack

... body ...

end

(class

(const nil :Stack) nil (begin ....)))

class Stack < Array

... body ...

end

(class

(const nil :Stack) (const nil :Array) (begin ....)))



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# File 'lib/rlang/parser.rb', line 281

def parse_class(node, wnode)
  class_const_node, super_class_const_node, body_node = *node.children
  rlse node, "expecting a constant for class name (got #{const_node})" \
    unless class_const_node.type == :const

  # create the class wnode
  class_path = _build_const_path(class_const_node)
  super_class_path = _build_const_path(super_class_const_node)
  wn_class = @wgenerator.klass(wnode, class_path, super_class_path)

  # If body node is nil then this must be interpreted as
  # a class declaration (no implementation yet)
  return wn_class unless body_node

  # Parse the body of the class
  parse_node(body_node, wn_class)

  # We finished parsing the class body so
  # 1) postprocess instance variables
  # 2) generate wnodes for the new/initialize function
  # 2) generate wnodes for attribute accessors
  @wgenerator.ivars_setup(wn_class)
  @wgenerator.def_initialize(wn_class) # generate **BEFORE** new
  @wgenerator.def_new(wn_class)
  @wgenerator.def_attr(wn_class)
  wn_class
end

#parse_const(node, wnode, keep_eval) ⇒ Object

Example TestA::C::MYCONST

(const (const (const nil :TESTA) :C) :MYCONST))



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# File 'lib/rlang/parser.rb', line 968

def parse_const(node, wnode, keep_eval)
  # Build constant path from embedded const sexp
  const_path = _build_const_path(node)
  full_const_name = const_path.join('::')

  # See if constant exists. It should at this point
  unless (const = wnode.find_const(const_path))
    rlse node, "unknown constant #{full_const_name}"
  end
  wn_const = @wgenerator.const(wnode, const)

  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval
  return wn_const
end

#parse_cvar(node, wnode, keep_eval) ⇒ Object

Example … @@stack_ptr

… s(:cvar, :@@stack_ptr)



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# File 'lib/rlang/parser.rb', line 842

def parse_cvar(node, wnode, keep_eval)
  rlse node, "Class variable can only be accessed in method scope" \
    unless wnode.in_method_scope?
  cv_name, = *node.children
  if (cvar = wnode.find_cvar(cv_name))
    wn_cvar = @wgenerator.cvar(wnode, cvar)
  else
    rlse node, "unknown class variable #{cv_name}"
  end
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval
  return wn_cvar
end

#parse_cvasgn(node, wnode, keep_eval) ⇒ Object

Example @@stack_ptr = 10 + nbytes

s(:cvasgn, :@@stack_ptr, s(:send, s(:int, 10), :+, s(:lvar, :nbytes)))



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# File 'lib/rlang/parser.rb', line 712

def parse_cvasgn(node, wnode, keep_eval)
  cv_name, exp_node = *node.children
  cvar = wnode.find_cvar(cv_name)

  if wnode.in_method_scope?      
    # if exp_node is nil then this is the form of 
    # :cvasgn that comes from op_asgn
    if exp_node
      if cvar.nil?
        # first cvar occurence
        # type cast the cvar to the wtype of the expression
        cvar = wnode.create_cvar(cv_name)
        wn_cvasgn = @wgenerator.cvasgn(wnode, cvar)
        wn_exp = parse_node(exp_node, wn_cvasgn)
        cvar.wtype = wn_exp.wtype
      else
        # if cvar already exists then type cast the 
        # expression to the wtype of the existing cvar
        wn_cvasgn = @wgenerator.cvasgn(wnode, cvar)
        wn_exp = parse_node(exp_node, wn_cvasgn)
        @wgenerator.cast(wn_exp, cvar.wtype, false)
      end
    else
      rlse node,  "Class variable #{cv_name} not declared before" unless cvar
      wn_cvasgn = @wgenerator.cvasgn(wnode, cvar)
    end
    # to mimic Ruby push the variable value on stack if needed
    @wgenerator.cvar(wnode, cvar) if keep_eval
    return wn_cvasgn

  elsif wnode.in_class_scope?
    # If we are in class scope
    # then it is a class variable initialization
    rlse node, "Class variable #{cv_name} already declared" if cvar
    rlse node, "Class variable op_asgn can only happen in method scope" unless exp_node
    # Parse the expression node to see if it's a ixx.const
    # in the end but get rid of it then because we are not
    # executing this code. Just statically initiliazing the 
    # cvar with the value
    wn_exp = parse_node(exp_node, wnode)
    rlse node,  "Class variable initializer can only be an int or a constant/class (got #{wn_exp}" \
      unless wn_exp.const?
    cvar = wnode.create_cvar(cv_name, wn_exp.wargs[:value], wn_exp.wtype)
    wnode.remove_child(wn_exp)
    logger.debug "Class variable #{cv_name} initialized with value #{cvar.value} and wtype #{cvar.wtype}"
    return
    
  else
    rlse node, "Class variable can only be defined in method or class scope"
  end
end

#parse_data_value(label, node) ⇒ Object

Data value node can be either of type int, str, send, array



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# File 'lib/rlang/parser.rb', line 2054

def parse_data_value(label, node)
  case node.type
  when :int, :str
    logger.debug "in :int/:str label #{label}, value #{node.children.last}"
    DAta.append(label, node.children.last)
  when :array
    node.children.each {|n| parse_data_value(label,n)}
  when :send
    recv_node,method_name,arg_node = *node.children
    logger.debug "in send: recv_node #{recv_node}, method_name #{method_name}"
    case method_name
    when :to_I64
      rlse node, "Data type casting can only apply to int (got #{recv_node}" \
        unless recv_node.type == :int
      value = recv_node.children.last
      DAta.append(label, value, Type::I64)
    when :[]
      rlse node, "Initializer can only be a Data address (got #{node})" \
        unless recv_node.children.last == :DAta
      rlse node, "Initializer expects a symbol (got #{arg_node})" \
        unless arg_node.type == :sym
      DAta.append(label, DAta[arg_node.children.last])
    else
      rlse node, "Unknow data initializer #{node}"
    end
  else
    rlse node, "Unknow data initializer #{node}"
  end
end

#parse_def(node, wnode, keep_eval) ⇒ Object

Instance method definition Example (def :push,

(args,
  s(:arg, :value)),... )

def push(value)

...

end



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# File 'lib/rlang/parser.rb', line 1067

def parse_def(node, wnode, keep_eval)
  logger.debug "node: #{node}\nwnode: #{wnode.head}"
  method_name, arg_nodes, body_node = *node.children
  logger.debug "Defining instance method: #{method_name}"

  # create corresponding func node
  wn_method = @wgenerator.def_method(wnode, method_name, :instance)
  if @@import
    wn_import = @wgenerator.import_method(wn_method, @@import_module_name, @@import_function_name)
  end

  # collect method arguments
  wn_args = parse_args(arg_nodes, wn_method)

  # Look for any result directive and parse it so 
  # that we know what the return type is in advance
  # If :nil for instance then it may change the way
  # we generate code in the body of the method
  if body_node && (result_node = body_node.children.find {|n| n.respond_to?(:type) && n.type == :send && n.children[1] == :result})
    logger.debug "result directive found: #{result_node}"
    parse_node(result_node, wn_method, keep_eval)
  end

  # method body -- A method evaluates to its last 
  # computed value unless a result :nil directive
  # is specified
  logger.debug "method_name: #{method_name}, wtype: #{wn_method.wtype}"
  parse_node(body_node, wn_method, !wn_method.wtype.blank?)

  # Now that we have parsed the whole method we can 
  # prepend locals, result and method args to the
  # method wnode (in that order)
  @wgenerator.locals(wn_method)
  @wgenerator.result(wn_method)
  @wgenerator.params(wn_method)
  @wgenerator.export_method(wn_method, @@export_name) if (@@export || self.config[:export_all])
  logger.debug "Full method wnode: #{wn_method}"

  # reset method toggles
  self.class._reset_toggles

  # if we are in a module then also define
  # the class method because we don't know
  # whether the module will be included or extended
  if wnode.in_module_scope?
    self.parse_defs(node, wnode, keep_eval)
  end
  return wn_method
end

#parse_defs(node, wnode, keep_eval) ⇒ Object

class method definition Example s(:defs,

s(:self), :push,
s(:args,
  s(:arg, :value)),... )

def self.push(value)

...

end



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# File 'lib/rlang/parser.rb', line 1005

def parse_defs(node, wnode, keep_eval)
  logger.debug "node: #{node}\nwnode: #{wnode.head}"
  if node.type == :def
    # we are being called from parse_def to define
    # a class method in addition to an instance method
    method_name, arg_nodes, body_node = *node.children
    recv_node = nil
  else
    recv_node, method_name, arg_nodes, body_node = *node.children
    rlse node, "only class method is supported. Wrong receiver at #{recv_node.loc.expression}" \
      if recv_node.type != :self
  end
  logger.debug "Defining class method: #{method_name}"
  logger.debug "recv_node: #{recv_node}\nmethod_name: #{method_name}"

  # create corresponding func node
  wn_method = @wgenerator.def_method(wnode, method_name, :class)
  if @@import
    wn_import = @wgenerator.import_method(wn_method, @@import_module_name, @@import_function_name)
  end

  # collect method arguments
  parse_args(arg_nodes, wn_method)
  # Look for any result directive and parse it so 
  # that we know what the return type is in advance
  # If :nil for instance then it may change the way
  # we generate code in the body of the method
  if body_node && (result_node = body_node.children.find {|n| n.respond_to?(:type) && n.type == :send && n.children[1] == :result})
    logger.debug "result directive found: #{result_node}"
    parse_node(result_node, wn_method, keep_eval)
  end

  # method body -- A method evaluates to its last 
  # computed value unless a result :nil directive
  # is specified
  logger.debug "method_name: #{method_name}, wtype: #{wn_method.wtype}"
  parse_node(body_node, wn_method, !wn_method.wtype.blank?)

  # Now that we have parsed the whole method we can 
  # prepend locals, result and method args to the
  # method wnode (in that order)
  @wgenerator.locals(wn_method)
  @wgenerator.result(wn_method)
  @wgenerator.params(wn_method)
  @wgenerator.export_method(wn_method, @@export_name) if (@@export || self.config[:export_all])
  logger.debug "Full method wnode: #{wn_method}"

  # reset method toggles
  self.class._reset_toggles

  return wn_method
end

#parse_false(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 894

def parse_false(node, wnode, keep_eval)
  wn_false = @wgenerator.int(wnode, WType::DEFAULT, 0)
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval

  logger.debug "wn_false:#{wn_false} wtype:#{wn_false.wtype} keep_eval:#{keep_eval}"
  return wn_false
end

#parse_file(file) ⇒ Object

Note : this method can be called recursively through require statements



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# File 'lib/rlang/parser.rb', line 80

def parse_file(file)
  rlse node, "parse_file only acccepts absolute path (got #{file})" \
    unless Pathname.new(file).absolute? || file.nil?
  # Already parsed. Ignore.
  if self.config[:LOADED_FEATURES].include? file
    logger.debug "File already loaded."
    return
  end

  # Set file currently parsed
  # Maintain a list of embedded require's
  @requires << (@config[:__FILE__] = file) if file

  # Parse file
  source = file ? File.open(file) : STDIN
  self.parse(File.read(source) )
  # Ff parsing went to completion then add this
  # file to the list of successfully loaded files
  (@config[:LOADED_FEATURES] ||= []) << file if file
  # and go back to previously parsed file
  if file
    @requires.pop
    @config[:__FILE__] = @requires.last
  end
end

#parse_gvar(node, wnode, keep_eval) ⇒ Object

Example … $MYGLOBAL

… s(:gvar, :$MYGLOBAL)



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# File 'lib/rlang/parser.rb', line 810

def parse_gvar(node, wnode, keep_eval)
  gv_name, = *node.children
  gvar = Global.find(gv_name)
  rlse node, "Unknown Global variable #{gv_name}" unless gvar
  wn_gvar = @wgenerator.gvar(wnode, gvar)
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval
  return wn_gvar
end

#parse_gvasgn(node, wnode, keep_eval) ⇒ Object

Example

$MYGLOBAL = 2000

(gvasgn :MYGLOBAL

(int 2000))

Example with type cast $MYGLOBAL = 2000.to_I64

(gvasgn :MYGLOBAL

(send (int 2000) :to_I64))



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# File 'lib/rlang/parser.rb', line 609

def parse_gvasgn(node, wnode, keep_eval)
  gv_name, exp_node = *node.children
  gvar = Global.find(gv_name)

  if wnode.in_method_scope?
    # if exp_node is nil then this is the form of 
    # :gvasgn that comes from op_asgn
    if exp_node
      if gvar.nil?
        # first gvar occurence
        # type cast the gvar to the wtype of the expression
        gvar = Global.new(gv_name)
        # Do not export global for now
        #gvar.export! if self.config[:export_all]
        wn_gvasgn = @wgenerator.gvasgn(wnode, gvar)
        wn_exp = parse_node(exp_node, wn_gvasgn)
        gvar.wtype = wn_exp.wtype
      else
        # if gvar already exists then type cast the 
        # expression to the wtype of the existing gvar
        wn_gvasgn = @wgenerator.gvasgn(wnode, gvar)
        wn_exp = parse_node(exp_node, wn_gvasgn)
        @wgenerator.cast(wn_exp, gvar.wtype, false)
      end
    else
      rlse node, "Global variable #{gv_name} not declared before" unless gvar
      wn_gvasgn = @wgenerator.gvasgn(wnode, gvar)
    end
    # to mimic Ruby push the variable value on stack if needed
    @wgenerator.gvar(wnode, gvar) if keep_eval
    return wn_gvasgn
  elsif true #wnode.in_class_scope?
    # If we are at root or in class scope
    # then it is a global variable initialization
    rlse node, "Global op_asgn can only happen in method scope" unless exp_node
    # In the class or root scope 
    # it can only be a Global var **declaration**
    # In this case the expression has to reduce
    # to a const wnode that can be used as value
    # in the declaration (so it could for instance
    # Global[:label] = 10 or Global[:label] = 10.to_I64)
    # Then remove the generated wnode because it is not for
    # execution. It is just to get the init value
    wn_exp = parse_node(exp_node, wnode)
    rlse node, "Global initializer can only be a int or a constant/class (got #{wn_exp})" \
      unless wn_exp.const?
    wnode.remove_child(wn_exp)
    if gvar
      gvar.value = wn_exp.wargs[:value]
    else
      gvar = Global.new(gv_name, wn_exp.wtype, wn_exp.wargs[:value])
    end
    # Do not export global for now
    #gvar.export! if self.config[:export_all]
    return nil
  else
    rlse node, "Global can only be defined in method or class scope"
  end
end

#parse_if_with_result_type(node, wnode, keep_eval) ⇒ Object

Process the if then else conditional statement (the Ruby else clause is optional) with a result type Example if (result type) expression

...

else

...

end

(if 

(sexp)

(then

...

) (else

...

)



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# File 'lib/rlang/parser.rb', line 2172

def parse_if_with_result_type(node, wnode, keep_eval)
  cond_node, then_node, else_node = *node.children
  # process the if clause
  wn_if = @wgenerator.if(wnode)
  parse_node(cond_node, wn_if, true) # always keep eval on stack
  # process the then clause
  wn_then = @wgenerator.then(wn_if)
  parse_node(then_node, wn_then, keep_eval)

  # infer the result type of the if from the
  # the type of the then clause
  wn_then.wtype = wn_then.children.last.wtype
  wn_if.wtype = wn_then.wtype
  # Now that we know the result type 
  # prepend it to the if children
  logger.debug("prepending result to wnode #{wn_if}")
  @wgenerator.result(wn_if) unless wn_if.wtype.blank?

  # process the else clause if it exists
  wn_else = @wgenerator.else(wn_if)
  if else_node
    parse_node(else_node, wn_else, keep_eval)
    wn_else.wtype = wn_else.children.last.wtype
    if wn_then.wtype != wn_else.wtype
      rlse node, "then and else clauses must return same wtype (got #{wn_then.wtype} and #{wn_else.wtype}"
    end
  else
    # if the else clause doesn't exist in Ruby we still
    # have to generate it in WAT because the else branch
    # **MUST** be there and return the same result type
    # as the then branch
    # In this case in Ruby the missing else clause would
    # cause the if statement to evaluate to nil if the
    # condition is false. Problem is "nil" doesn't exist in
    # Webassembly. For now let's return a "remarkable" value
    # (see NIL constant)
    # WARNING!! This is not satisfactory of course because
    # the then branch could one day return this exact same
    # value too
    #
    # A safer alternative (but not compliant with plain Ruby)
    # would be to assume that if-then-else in Rlang never
    # evaluates to a value (see method parse_if_without_result_type)
    @wgenerator.int(wn_else, wn_then.wtype, NIL)
    wn_else.wtype = wn_then.wtype
  end
  
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval
  return wn_if
end

#parse_if_without_result_type(node, wnode, keep_eval) ⇒ Object

Process the if then else conditional statement (the else clause can be absent) with a result type Example if|unless (result type) expression

...

else

...

end

(if 

(sexp)

(then

...

) (else

...

)



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# File 'lib/rlang/parser.rb', line 2116

def parse_if_without_result_type(node, wnode, keep_eval)
  cond_node, then_node, else_node = *node.children
  # process the if clause
  # always keep eval on stack for the if statement
  wn_if = @wgenerator.if(wnode)
  parse_node(cond_node, wn_if, true)

  # process the then clause
  # DO NOT keep the last evaluated value
  # if then clause is nil it's probably
  # because it's actually an unless statement
  wn_then = @wgenerator.then(wn_if)
  if then_node
    parse_node(then_node, wn_then, false)
  else
    @wgenerator.nop(wn_then)
  end

  # The result type is always nil in this variant
  # of the parse_if_... method
  wn_if.wtype = WType.new(:nil); wn_then.wtype = WType.new(:nil)

  # process the else clause if it exists
  # DO NOT keep the last evaluated value
  if else_node
    wn_else = @wgenerator.else(wn_if)
    parse_node(else_node, wn_else, false)
    wn_else.wtype = WType.new(:nil)
  end
  
  # Drop last evaluated result if asked to
  # No need to drop the last evaluated value
  # here as the then and else branches do not
  # return any
  # @wgenerator.drop(wnode) unless keep_eval
  return wn_if
end

#parse_int(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 874

def parse_int(node, wnode, keep_eval)
  value, = *node.children
  logger.debug "int: #{value} for parent wnode #{wnode.head} keep_eval:#{keep_eval}"
  wn_int = @wgenerator.int(wnode, WType::DEFAULT, value)
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval

  logger.debug "wn_int:#{wn_int} wtype:#{wn_int.wtype} keep_eval:#{keep_eval}"
  return wn_int
end

#parse_ivar(node, wnode, keep_eval) ⇒ Object

Example … @stack_ptr

… s(:ivar, :@stack_ptr)



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# File 'lib/rlang/parser.rb', line 824

def parse_ivar(node, wnode, keep_eval)
  rlse node, "Instance variable can only be accessed in instance method scope" \
    unless wnode.in_instance_method_scope?
  iv_name, = *node.children
  if (ivar = wnode.find_ivar(iv_name))
    wn_ivar = @wgenerator.ivar(wnode, ivar)
  else
    rlse node, "unknown instance variable #{ivar_name}"
  end
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval
  wn_ivar
end

#parse_ivasgn(node, wnode, keep_eval) ⇒ Object

Example

s(:ivasgn, :@stack_ptr, s(:send, s(:int, 10), :+, s(:lvar, :nbytes)))



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# File 'lib/rlang/parser.rb', line 674

def parse_ivasgn(node, wnode, keep_eval)
  iv_name, exp_node = *node.children

  rlse node,  "Instance variable #{iv_name} can only used in instance method scope" \
    unless wnode.in_instance_method_scope? 

  if (ivar = wnode.find_ivar(iv_name))
    # if ivar already exists then type cast the 
    # expression to the wtype of the existing ivar
    wn_ivasgn = @wgenerator.ivasgn(wnode, ivar)
    wn_exp = parse_node(exp_node, wn_ivasgn)
    logger.debug "Casting exp. wtype #{wn_exp.wtype} to existing ivar #{ivar.name} wtype #{ivar.wtype}"
    @wgenerator.cast(wn_exp, ivar.wtype, false)
  else
    # first ivar occurence, create it 
    ivar = wnode.create_ivar(iv_name)
    # parse the expression to determine its wtype
    wn_phony = @wgenerator.phony(wnode)
    wn_exp = parse_node(exp_node, wn_phony)
    # the ivar wtype is defined by the
    # wtype of the expression
    ivar.wtype = wn_exp.wtype
    wn_ivasgn = @wgenerator.ivasgn(wnode, ivar)
    wn_phony.reparent_children_to(wn_ivasgn)
    logger.debug "Setting new ivar #{ivar.name} wtype to #{wn_exp.wtype.name}"      
  end

  # The wasm code for the ivar setter wnode doesn't leave
  # any value on stack (store instruction). So if the last
  # evaluated value must be kept then load the ivar again
  @wgenerator.ivar(wnode, ivar) if keep_eval
  wn_ivasgn
end

#parse_logical_op(node, wnode, keep_eval) ⇒ Object

Ruby || operator Example n==1 || n==2

(or

(send (lvar :n) :== (int 1))
(send (lvar :n) :== (int 2))

) Ruby && operator Example n==1 && m==3

(and

(send (lvar :n) :== (int 1))
(send (lvar :m) :== (int 3))

)



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# File 'lib/rlang/parser.rb', line 2279

def parse_logical_op(node, wnode, keep_eval)
  logger.debug "logical operator section : #{node.type}"
  cond1_node, cond2_node = *node.children
  # Prepare the operator wnode
  wn_op = @wgenerator.native_operator(wnode, node.type)
  # Parse operand nodes and attach them to the
  # operator wnode
  wn_cond1 = parse_node(cond1_node, wn_op)
  wn_cond2 = parse_node(cond2_node, wn_op)
  @wgenerator.operands(wn_op, wn_cond1, [wn_cond2])
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval
  return wn_op
end

#parse_lvar(node, wnode, keep_eval) ⇒ Object

Example … nbytes

… s(:lvar, :nbytes)



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# File 'lib/rlang/parser.rb', line 860

def parse_lvar(node, wnode, keep_eval)
  logger.debug("node: #{node}, wnode: #{wnode.head}, keep_eval: #{keep_eval}")

  lv_name, = *node.children
  if (lvar = wnode.find_lvar(lv_name) || wnode.find_marg(lv_name))
    wn_lvar = @wgenerator.lvar(wnode, lvar)
  else
    rlse node, "unknown local variable #{lv_name}"
  end
  # Drop last evaluated result if asked to 
  @wgenerator.drop(wnode) unless keep_eval
  return wn_lvar
end

#parse_lvasgn(node, wnode, keep_eval) ⇒ Object

Regular Example var1 = @@stack_ptr + nbytes

s(:lvasgn, :var1, s(:send, s(:cvar, :@@stack_ptr), :+, s(:lvar, :nbytes)))

Example coming from an op_asgn node arg1 += 2

s(s(lvasgn, :arg1), :+, s(int 2)))



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# File 'lib/rlang/parser.rb', line 773

def parse_lvasgn(node, wnode, keep_eval)
  lv_name, exp_node = *node.children
  lvar = wnode.find_lvar(lv_name) || wnode.find_marg(lv_name)

  logger.debug "Assign to #{lv_name}, exp_node: #{exp_node}, keep_eval: #{keep_eval}"
  logger.debug "lvar found: #{lvar}"

  # if exp_node is nil then this is the form of 
  # :lvasgn that comes from op_asgn
  if exp_node
    if lvar.nil?
      # first lvar occurence
      # type cast the lvar to the wtype of the expression
      lvar = wnode.create_lvar(lv_name)
      wn_lvasgn = @wgenerator.lvasgn(wnode, lvar)
      wn_exp = parse_node(exp_node, wn_lvasgn)
      lvar.wtype = wn_exp.wtype
    else
      # if cvar already exists then type cast the 
      # expression to the wtype of the existing cvar
      wn_lvasgn = @wgenerator.lvasgn(wnode, lvar)
      wn_exp = parse_node(exp_node, wn_lvasgn)
      @wgenerator.cast(wn_exp, lvar.wtype, false)
    end
  else
    rlse node, "Local variable #{cv_name} not declared before" unless lvar
    wn_lvasgn = @wgenerator.lvasgn(wnode, lvar)
  end
  # to mimic Ruby push the variable value on stack if needed
  @wgenerator.lvar(wnode, lvar) if keep_eval
  return wn_lvasgn
end

#parse_module(node, wnode) ⇒ Object

Example: module Kernel

... body ...

end

(module

(const nil :Kernel) nil (begin ....)))



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# File 'lib/rlang/parser.rb', line 317

def parse_module(node, wnode)
  const_node = node.children.first
  body_node = node.children.last
  rlse node, "expecting a constant for module name (got #{const_node})" \
    unless const_node.type == :const
  
  module_path = _build_const_path(const_node)

  # create the module wnode
  wn_module = @wgenerator.module(wnode, module_path)
  # Parse the body of the module
  parse_node(body_node, wn_module) if body_node
  wn_module
end

#parse_next(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2259

def parse_next(node, wnode, keep_eval)
  @wgenerator.next(wnode)
end

#parse_node(node, wnode, keep_eval = true) ⇒ Object

Parse Ruby AST node and generate WAT code as a child of wnode

  • node: the Ruby AST node to parse

  • wnode: the parent wnode for the generated WAT code

  • keep_eval: whether to keep the value of the evaluated WAT expression on stock or not



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# File 'lib/rlang/parser.rb', line 124

def parse_node(node, wnode, keep_eval=true)
  rlse node, "wnode type is incorrect (got #{wnode})" unless wnode.is_a?(WNode) || wnode.nil?
  logger.debug "\n---------------------->>\n" + 
    "Parsing node: #{node}, wnode: #{wnode.head}, keep_eval: #{keep_eval}"
  # Nothing to parse
  return if node.nil?

  # check if there is a comment
  if config[:comments] && (comments = @associated_comments[node])
    @wgenerator.comments(wnode, comments)
  end

  case node.type
  when :self
    wn = parse_self(node, wnode)

  when :class
    wn = parse_class(node, wnode)

  when :module
    wn = parse_module(node, wnode)

  when :defs
    wn = parse_defs(node, wnode, keep_eval)

  when :def
    wn = parse_def(node, wnode, keep_eval)

  when :begin
    wn = parse_begin(node, wnode, keep_eval)

  when :casgn
    wn = parse_casgn(node, wnode, keep_eval)

  when :ivasgn
    wn = parse_ivasgn(node, wnode, keep_eval)

  when :cvasgn
    wn = parse_cvasgn(node, wnode, keep_eval)

  when :gvasgn
    wn = parse_gvasgn(node, wnode, keep_eval)

  when :lvasgn
    wn = parse_lvasgn(node, wnode, keep_eval)

  when :op_asgn
    wn = parse_op_asgn(node, wnode, keep_eval)

  when :lvar
    wn = parse_lvar(node, wnode, keep_eval)

  when :ivar
    wn = parse_ivar(node, wnode, keep_eval)

  when :cvar
    wn = parse_cvar(node, wnode, keep_eval)

  when :gvar
    wn = parse_gvar(node, wnode, keep_eval)

  when :int
    wn = parse_int(node, wnode, keep_eval)
  
  when :float
    rlse node, "float instructions not supported"
    #parse_float(node, wnode, keep_eval)

  when :nil
    rlse node, "nil not supported"

  when :const
    wn = parse_const(node, wnode, keep_eval)

  when :send
    wn = parse_send(node, wnode, keep_eval)

  when :return
    wn = parse_return(node, wnode, keep_eval)
  
  when :if
    #parse_if_with_result_type(node, wnode, keep_eval)
    wn = parse_if_without_result_type(node, wnode, keep_eval)
  
  when :while
    #parse_while_with_result_type(node, wnode, keep_eval)
    wn = parse_while_without_result_type(node, wnode, keep_eval)
  
  when :until
    #parse_while_with_result_type(node, wnode, keep_eval)
    wn = parse_while_without_result_type(node, wnode, keep_eval)
  
  when :break
    wn = parse_break(node, wnode, keep_eval)

  when :next
    wn = parse_next(node, wnode, keep_eval)

  when :or, :and
    wn = parse_logical_op(node, wnode, keep_eval)

  when :true
    wn = parse_true(node, wnode, keep_eval)

  when :false
    wn = parse_false(node, wnode, keep_eval)

  when :str
    wn = parse_string(node, wnode, keep_eval)

  when :array
    wn = parse_array(node, wnode, keep_eval)

  else
    rlse node, "Unknown node type: #{node.type} => #{node}"
  end
  rlse node, "wnode type is incorrect (got #{wn}) at node #{node}" unless wn.is_a?(WNode) || wn.nil?
  logger.debug "\n----------------------<<\n" + 
    "End parsing node: #{node}, parent wnode: #{wnode&.head}, keep_eval: #{keep_eval}\n generated wnode #{wn&.head}" +
    "\n----------------------<<\n"
  wn
end

#parse_op_asgn(node, wnode, keep_eval) ⇒ Object

TODO: the code for op_asgn is quite murky but I thought we would use quite often so I implemented it. We could do without it though..

Example (local var)

arg1 *= 20

(op-asgn

(lvasgn :arg1)
:* 
(int 20)) )

Example (class var) @@stack_ptr -= nbytes

s(:op_asgn,

s(:cvasgn, :@@stack_ptr), :-, s(:lvar, :nbytes))

Example (global var) $MYGLOBAL -= nbytes

s(:op_asgn,

s(:gvasgn, :$MYGLOBAL), :-, s(:lvar, :nbytes))

Example (instance var)

s(:op_asgn,

s(:ivasgn, :@stack_ptr), :-, s(:lvar, :nbytes))

Example (setter/getter) p.size -= nunits

(op-asgn

(send
  (lvar :p) :size) :-
(lvar :nunits))

**** DEPRECATED FORM OF GLOBALS ***** Example (Global) Global += 1

(op-asgn

(send
  (const nil :Global) :[] (sym :$DEBUG))
  :+
  (int 1)))



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# File 'lib/rlang/parser.rb', line 380

def parse_op_asgn(node, wnode, keep_eval)
  op_asgn_type = node.children.first.type
  logger.debug "op_asgn on #{op_asgn_type} / wnode: #{wnode.head}, keep_eval: #{keep_eval}"

  case op_asgn_type
  # Global variable case
  when :gvasgn
    var_asgn_node, op, exp_node = *node.children
    var_name = var_asgn_node.children.last

    # parse the variable setting part
    # Note: this will also create the variable setting
    # wnode as a child of wnode
    wn_var_set = parse_node(var_asgn_node, wnode, keep_eval)
    gvar = Global.find(var_name)
    # \nline #{node.location.line}: #{node.location.expression.range.source}
    rlse node, "Unknown global variable #{var_name}" unless gvar

    # Create the operator node (infer operator type from variable)
    wn_op = @wgenerator.send_method(wn_var_set, gvar.wtype.class_path, op, :instance)
    # Create the var getter node as a child of operator node
    wn_var_get = @wgenerator.gvar(wn_op, gvar)

  # Class variable case
  when :cvasgn
    var_asgn_node, op, exp_node = *node.children
    var_name = var_asgn_node.children.last

    # parse the variable setting part
    # Note: this will also create the variable setting
    # wnode as a child of wnode
    wn_var_set = parse_node(var_asgn_node, wnode, keep_eval)
    cvar = wnode.find_cvar(var_name)
    rlse node, "Unknown class variable #{var_name}" unless cvar

    # Create the operator node (infer operator type from variable)
    wn_op = @wgenerator.send_method(wn_var_set, cvar.wtype.class_path, op, :instance)
    # Create the var getter node as a child of operator node
    wn_var_get = @wgenerator.cvar(wn_op, cvar)
  
  # Local variable case
  when :lvasgn
    var_asgn_node, op, exp_node = *node.children
    var_name = var_asgn_node.children.last

    # parse the variable setter node
    # Note: this will also create the variable setting
    # wnode as a child of wnode
    wn_var_set = parse_node(var_asgn_node, wnode, keep_eval)
    lvar = wnode.find_lvar(var_name) || wnode.find_marg(var_name)
    rlse node, "Unknown local variable #{var_name}" unless lvar

    # Create the operator node (infer operator type from variable)
    wn_op = @wgenerator.send_method(wn_var_set, lvar.wtype.class_path, op, :instance)
    # Create the var getter node as a child of operator node
    wn_var_get = @wgenerator.lvar(wn_op, lvar)

  # Instance variable case
  # Example (instance var)
  # @stack_ptr -= nbytes
  # ---
  # s(:op_asgn,
  #    s(:ivasgn, :@stack_ptr), :-, s(:lvar, :nbytes))
  when :ivasgn
    rlse node, "Instance variable can only be accessed in instance method scope" \
      unless wnode.in_instance_method_scope?
    var_asgn_node, operator, exp_node = *node.children
    var_name = var_asgn_node.children.last

    # To op_asgn to work, ivar must already be declared
    ivar = wnode.find_ivar(var_name)
    rlse node, "Unknown instance variable #{var_name}" unless ivar

    # Create the top level variable setter node
    wn_var_set = @wgenerator.ivasgn(wnode, ivar)

    # Second argument of the setter is the operator wnode
    # Create it with wtype of receiver by default. We may
    # change that wtype with the operands call later on
    wn_op = @wgenerator.send_method(wn_var_set, ivar.wtype.class_path, operator, :instance)

    # now create the getter node as a child of the
    # operator
    wn_var_get = @wgenerator.ivar(wn_op, ivar)

    # The wasm code for the ivar setter wnode doesn't leave
    # any value on stack (store instruction). So if the last
    # evaluated value must be kept then load the ivar again
    @wgenerator.ivar(wnode, ivar) if keep_eval

  # setter/getter case
  # Example (setter/getter)
  # p.size -= nunits
  # ---
  # (op-asgn
  #   (send
  #     (lvar :p) :size) :-
  #   (lvar :nunits))
  when :send
    send_node, op, exp_node = *node.children
    recv_node, method_name = *send_node.children

    # Parse the receiver node ((lvar :p) in the example)
    # above to get its wtype
    # Force keep_eval to true whatever upper level 
    # keep_eval says
    wn_recv = parse_node(recv_node, wnode, true)

    # Create the top level setter call
    wn_var_set = @wgenerator.send_method(wnode, wn_recv.wtype.class_path, :"#{method_name}=", :instance)

    # First argument of the setter must be the recv_node
    wn_recv.reparent_to(wn_var_set)

    # Second argument of the setter is the operator wnode
    # Create it with wtype of receiver by default. We may
    # change that wtype with the operands call later on
    wn_op = @wgenerator.send_method(wn_var_set, wn_recv.wtype.class_path, op, :instance)

    # Parsing the send node will create the getter wnode
    # this is the first argument of the operator wnode,
    # the second is wn_exp below
    # Force keep_eval to true whatever upper level 
    # keep_eval says
    wn_var_get = parse_node(send_node, wn_op, true)

    # If the setter returns something and last evaluated value
    # must be ignored then drop it
    unless (keep_eval || wn_var_set.wtype.blank?)
      @wgenerator.drop(wnode)
      #@wgenerator.send_method(wnode, wn_recv.wtype.class_path, "#{method_name}", :instance)
    end
  else
    rlse node, "op_asgn not supported for #{node.children.first}"
  end

  # Finally, parse the expression node and make it
  # the second child of the operator node
  # Last evaluated value must be kept of course
  wn_exp = parse_node(exp_node, wn_op, true)
  
  # And process operands (cast and such...)
  @wgenerator.operands(wn_op, wn_var_get, [wn_exp])

  return wn_var_set
end

#parse_require(wnode, file) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 1117

def parse_require(wnode, file)
  logger.debug "File required: #{file}"
  extensions = ['', '.wat', '.rb']
  full_path_file = nil
  if Pathname.new(file).absolute?
    logger.debug "Absolute path detected"
    extensions.each do |ext|
      full_path_file = file+ext
      if File.file?(full_path_file)
        logger.debug "Found required file: #{full_path_file}"
        break
      end
    end
  else
    case file
    when /^\./
      # If file starts with . then look for file in pwd
      load_path = [Dir.pwd]
=begin
    when /^rlang/
      # If it starts with rlang then look for it in the 
      # installed rlang gem in addition to load path
      load_path = self.config[:LOAD_PATH] + $LOAD_PATH
=end
    else
      load_path = self.config[:LOAD_PATH]
      load_path = [Dir.pwd] if self.config[:LOAD_PATH].empty?
    end
    logger.debug "load_path: #{load_path} for file #{file}"

    # Now try each possible extension foreach possible
    # directory in the load path
    load_path.each do |dir|
      logger.debug "Searching in dir: #{dir}"
      break unless extensions.each do |ext|
        fpf = File.expand_path(File.join(dir, file+ext))
        if File.file?(fpf)
          logger.debug "Found required file: #{fpf}"
          full_path_file = fpf; break
        end
      end
    end
  end
  rlse node, LoadError, "no such file to load: #{file}" unless full_path_file

  # Now load the file 
  if File.extname(full_path_file) == '.wat'
    wat_code = File.read(full_path_file)
    @wgenerator.inline(wnode, wat_code)
  else
    parse_file(full_path_file)
  end
end

#parse_require_relative(wnode, file) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 1171

def parse_require_relative(wnode, file)
  logger.debug "Require file: #{file}...\n   ...relative to #{self.config[:__FILE__]}"
  full_path_file = File.expand_path(file, File.dirname(self.config[:__FILE__]))
  parse_require(wnode, full_path_file)
end

#parse_return(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2084

def parse_return(node, wnode, keep_eval)
  ret_count = node.children.count
  rlse node, "only one or no value can be returned (got #{ret_count})" if ret_count > 1
  exp_node = node.children.first
  wn_ret = @wgenerator.return(wnode)
  if exp_node
    wn_exp = parse_node(exp_node, wn_ret)
    wn_ret.wtype = wn_exp.wtype
  else
    wn_ret.wtype = WType.new(:none)
  end
  wn_ret
end

#parse_self(node, wnode) ⇒ Object

Parse self. We should ge there only when sis an object instance (not a class instance)



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# File 'lib/rlang/parser.rb', line 2034

def parse_self(node, wnode)
  if  wnode.in_instance_method_scope?
    wn = @wgenerator._self_(wnode)
    logger.debug "self in instance method scope"
  elsif wnode.in_class_method_scope?
    # Nothing to do just return nil
    # TODO: not sure this is the right thing to do. Double check
    logger.debug "self in class method scope. Nothing to do."
  elsif wnode.in_class_scope?
    # Nothing to do just return nil
    # TODO: not sure this is the right thing to do. Double check
    logger.debug "self in class definition scope. Nothing to do."
  else
    rlse node, "Don't know what self means in this context: #{wnode.head}"
  end 
  wn
end

#parse_send(node, wnode, keep_eval) ⇒ Object

Parse the many differents forms of send (both compile time directives and application calls)



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# File 'lib/rlang/parser.rb', line 1179

def parse_send(node, wnode, keep_eval)
  recv_node = node.children[0]
  method_name = node.children[1]
  logger.debug "recv_node #{recv_node}, method_name : #{method_name}"
  logger.debug "scope: #{wnode.scope}"

  if recv_node.nil?
    return parse_send_nil_receiver(node, wnode, keep_eval)
  end
  
  # Special case : DAta initializers
  #
  # Example (setting DAta address)
  # DAta.address = 0
  # ---------
  # (send
  #   (const nil :DAta) :address=
  #   (int 0))
  #
  # Example (setting DAta alignment)
  # DAta.align(8)
  # ---------
  # (send
  #   (const nil :DAta) :align
  #   (int 8))
  #
  # Example (value is an i32)
  # DAta[:an_I32] = 3200
  # ---------
  # (send
  #  (const nil :DAta) :[]=
  #  (sym :an_I32)
  #  (int 32000))
  # )
  #
  # Example (value is an i64)
  # DAta[:an_I64] = 3200.to_I64
  # ---------
  # (send
  #  (const nil :DAta) :[]=
  #  (sym :an_I64)
  #  (send
  #    (int 32000) :to_Ixx))
  # )
  # 
  # Example (value is a String)
  # DAta[:a_string] = "My\tLitte\tRlang\x00"
  # ---------
  # (send
  #   (const nil :Data) :[]=
  #   (sym :a_string)
  #   (str "My\tLitte\tRlang\u0000"))
  #
  # Example (value is a data address)
  # DAta[:an_address] = DAta[:a_string]
  # ---------
  # (send
  #   (const nil :DAta) :[]=
  #  (sym :an_address)
  #  (send
  #    (const nil :DAta) :[]
  #    (sym :a_string)))
  #
  # Example (value is an array)
  # Data[:an_array] = [ Data[:an_I64], 5, 257, "A string\n"]
  # ---------
  # (send
  #   (const nil :Data) :[]=
  #   (sym :an_array)
  #   (array
  #     (send
  #       (const nil :Data) :[]
  #       (sym :an_I64))
  #     (int 5)
  #    (int 257)
  #    (str "A string\n")))
  #

  if recv_node.type == :const  && recv_node.children.last == :DAta
    case method_name
    when :address=
      value_node = node.children[2]
      rlse node, "DAta address must be an integer" unless value_node.type == :int
      DAta.address = value_node.children.last
    when :align
      value_node = node.children[2]
      rlse node, "DAta alignment argument must be an integer" unless value_node.type == :int
      DAta.align(value_node.children.last)
    when :[]=
      if (data_label_node = node.children[2]).type == :sym
        label = data_label_node.children.last
      else
        rlse node, "Data label must be a symbol (got #{data_label_node}"
      end
      arg_node = node.children[3]
      parse_data_value(label, arg_node)
    else
      rlse node, "Unsupported DAta method #{method_name}"
    end
    return
  end

  # General type cast directive
  # this must be processed at compile time. It's not dynamic
  # An expression can be cast to any Rlang class including
  # native types like :I64,:I32,...
  #
  # Example
  # (expression).cast_to(class_name, argument)    
  # -----
  # s(:send,
  #    s(expression),
  #    :cast_to, s(sym, :Class_name))
  # the signed argument true|false is optional and 
  # it defaults to false
  # Class_name is a symbol like :A or :"A:B" or :"A:B:C"
  if method_name == :cast_to
    class_name_node = node.children.last
    rlse node, "cast_to expects a symbol argument (got #{class_name_node}" unless class_name_node.type == :sym
    tgt_wtype = WType.new(class_name_node.children.first)
    logger.debug "in cast_to: target type #{tgt_wtype}"

    # Parse the expression and cast it
    wn_to_cast = parse_node(recv_node, wnode)
    logger.debug("wn_to_cast: #{wn_to_cast}")
    wn_cast = @wgenerator.cast(wn_to_cast, tgt_wtype)
    logger.debug("wn_cast: #{wn_cast}")
    # Drop last evaluated result if asked to
    @wgenerator.drop(wnode) unless keep_eval
    return wn_cast
  end


  # Explicit type cast directives for native types.
  # Used at compile time
  #
  # Example
  # (recv).to_xxxx where xxxx can be [U]I[32|64]
  # -----
  # s(:send,
  #    s(expression),
  #    :to_I64)
  #
  if [:to_UI64, :to_I64, :to_UI32, :to_I32].include? method_name
    if (cnt = node.children.count) > 2
      rlse node, "cast directive should have no argument (got #{cnt - 2})"
    end
    tgt_rlang_type = method_name.to_s.scan(/to_(.+)$/).first.first
    tgt_wtype = WType.new(tgt_rlang_type)
    signed = tgt_wtype.signed?
    logger.debug "in cast section: child count #{cnt}, tgt_wtype #{tgt_wtype}, signed: #{signed}"

    # Parse the expression and cast it
    wn_to_cast = parse_node(recv_node, wnode)
    logger.debug("wn_to_cast: #{wn_to_cast}")
    wn_cast = @wgenerator.cast(wn_to_cast, tgt_wtype, signed)
    logger.debug("wn_cast: #{wn_cast}")
    # Drop last evaluated result if asked to
    @wgenerator.drop(wnode) unless keep_eval
    return wn_cast
  end

  # addr method applied to statically allocated variables
  # only constant and class variables returns their address 
  # in memory
  #
  # Example
  # @@argv_bu_size.addr
  # ---
  # (send (cvar :@@argv_buf_size) :addr)
  #
  if method_name == :addr
    if recv_node.type == :const
      # Build constant path from embedded const sexp
      const_path = _build_const_path(recv_node)
      full_const_name = const_path.join('::')

      # See if constant exists. It should at this point
      unless (const = wnode.find_const(const_path))
        rlse node, "unknown constant #{full_const_name}"
      end
      wn_const_addr = @wgenerator.const_addr(wnode, const)

      # Drop last evaluated result if asked to
      @wgenerator.drop(wnode) unless keep_eval
      return wn_const_addr

    elsif recv_node.type == :cvar
      rlse node, "Class variable can only be accessed in method scope" \
        unless wnode.in_method_scope?
      cv_name = recv_node.children.first
      if (cvar = wnode.find_cvar(cv_name))
        wn_cvar_addr = @wgenerator.cvar_addr(wnode, cvar)
      else
        rlse node, "unknown class variable #{cv_name}"
      end
      # Drop last evaluated result if asked to
      @wgenerator.drop(wnode) unless keep_eval
      return wn_cvar_addr

    else
      # Do nothing. This will be treated as a regular method call
    end
  end

  # A that stage it's a method call of some sort
  # (call on class or instance)
  return parse_send_method_lookup(node, wnode, keep_eval)

end

#parse_send_arg(node, wnode, keep_eval) ⇒ Object

Directive to define method argument type this must be processed at compile time if method name is :arg then it is a type definition for a method argument arg value: :I64

s(:send, nil, :arg,

(hash
   (pair
     s(:sym, :value)
     s(:sym, :I64))

))



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# File 'lib/rlang/parser.rb', line 1625

def parse_send_arg(node, wnode, keep_eval)
  rlse node, "arg declaration can only be used in methods" \
    unless wnode.in_method_scope?
  hash_node = node.children.last
  marg_types = parse_type_args(hash_node, :argument)
  marg_types.each do |name, wtype|
    marg = wnode.find_marg(name)
    rlse node, "couldn't find method argument #{name}" unless marg
    marg.wtype = WType.new(wtype)
  end
  return
end

#parse_send_attr(node, wnode, keep_eval) ⇒ Object

Directive to define class attributes. This defines a list of getters and setters and access them in memory with an offset from the base address given as an argument.

xxxxx below can be reader, writer, accessor

Example attr_xxxxx :ptr, :size

s(:send, nil, :attr,

s(:sym, :ptr),
s(:sym, :size))



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# File 'lib/rlang/parser.rb', line 1706

def parse_send_attr(node, wnode, keep_eval)
  rlse node, "attr directives can only happen in class scope" \
    unless wnode.in_class_scope?
  
  # check accessor directive is valid
  attr_access = node.children[1].to_s
  rlse node, "Unknown kind of attribute accessor: #{attr_access}" \
    unless ['attr_reader', 'attr_writer', 'attr_accessor'].include? attr_access
  # scan through all attributes
  attr_nodes = node.children[2..-1]
  attr_nodes.each do |an|
    logger.debug "processing attr node #{an}"
    rlse node, "attribute name must be a symbol (got #{an})" unless an.type == :sym
    attr_name = an.children.last
    if (attr = wnode.find_attr(attr_name))
      rlse node, "attribute #{attr_name} already declared" if attr
    else
      attr = wnode.create_attr(attr_name)
      attr.export!
    end
    attr.send(attr_access)
  end
  nil
end

#parse_send_attr_type(node, wnode, keep_eval) ⇒ Object

Directive to specify wasm type of class attributes in case it’s not the default type

Example attr_type ptr: :Header, size: :I32

s(:send, nil, :attr_type,

(hash
  (pair
    s(:sym, :ptr)
    s(:sym, :Header))
  (pair
    s(:sym, :size)
    s(:sym, :I32))   ))



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# File 'lib/rlang/parser.rb', line 1746

def parse_send_attr_type(node, wnode, keep_eval)
  rlse node, "attr directives can only happen in class scope" \
    unless wnode.in_class_scope?
  hash_node = node.children.last
  attr_types = parse_type_args(hash_node, :attribute)
  attr_types.each do |name, wtype|
    logger.debug "Setting attr #{name} type to #{wtype}"
    if (attr = wnode.find_attr(name))
      # TODO find a way to update both wtype at once
      attr.wtype = WType.new(wtype)
    else
      rlse node, "Unknown class attribute #{name} in #{wnode.head}"
    end          
  end
  return
end

#parse_send_class_method_call(node, wnode, keep_eval) ⇒ Object

Regular class Method call to self class or another class Example self.m_one_arg(arg1, 200)

(send

(self) :m_one_arg
(lvar :arg1)
(int 200)

) OR Test.m_one_arg(arg1, 200) (send

(const nil :Test) :m_one_arg
(lvar :arg1)
(int 200)

)

OR New object instantiation This is class object instantiation. Statically allocated though. So it can only happen in the class scope for a class variable or a constant Example self.new

(send

(self) :new) )

OR Header.new

(send

(const nil :Header) :new) )



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# File 'lib/rlang/parser.rb', line 1898

def parse_send_class_method_call(node, wnode, keep_eval)
  logger.debug "Parsing class method call..."
  recv_node = node.children[0]
  method_name = node.children[1]
  if recv_node.nil? || recv_node.type == :self
    # differ class_name identification to
    class_path = []
  elsif recv_node.type == :const
    class_path = _build_const_path(recv_node)
  else
    rlse node, "Can only call method class on self or class objects (got #{recv_node} in node #{node})"
  end
  logger.debug "...#{class_path}::#{method_name}"
  if method_name == :new && (wnode.in_class_scope? || wnode.in_root_scope?)
    # This is class object instantiation. Statically 
    # allocated though. So it can only happen in the
    # class scope for a class variable or a constant
    # Returns a wnode with a i32.const containing the address
    wn_addr = @wgenerator.static_new(wnode, class_path)
    return wn_addr
  else
    wn_call = @wgenerator.send_method(wnode, class_path, method_name, :class)
    arg_nodes = node.children[2..-1]
    arg_nodes.each { |node| parse_node(node, wn_call) }
    # Drop last evaluated result if asked to or if
    # the method called doesn't return any value
    @wgenerator.drop(wnode) unless (keep_eval || wn_call.wtype.blank?)
    return wn_call
  end
  rlse node, "FATAL ERROR!! Unreachable point at end of parse_send_class_method_call (node: #{node})"
end

#parse_send_export(node, wnode, keep_eval) ⇒ Object

Directive to declare the current method in the WASM exports Example

export

(send nil :export) OR export :function_name

(send nil :export

(sym :function_name))

With out an explicit function name, the export name will be automatically built from the class/method names



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# File 'lib/rlang/parser.rb', line 1547

def parse_send_export(node, wnode, keep_eval)
  logger.debug "Export directive found for..."
  rlse node, "export must be used in class scope" unless wnode.in_class_or_module_scope?
  @@export = true
  if (function_node = node.children[2])
    rlse node, "export function name must be a symbol (got #{function_node})" \
      unless function_node.type == :sym  
    @@export_name = function_node.children.last
  end
  logger.debug "... #{@@export_name}"
  return
end

#parse_send_extend(node, wnode, keep_eval) ⇒ Object

Directive to extend a module current file Example extend Kernel

(send nil :extend

(const nil :Kernel))



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# File 'lib/rlang/parser.rb', line 1522

def parse_send_extend(node, wnode, keep_eval)
  const_node = node.children.last
  module_path = _build_const_path(const_node)
  rlse node, "expecting a constant for extend (got #{const_node})" \
    unless const_node.type == :const
  rlse node, "extend must be used in class scope" \
    unless wnode.in_class_scope?
  @wgenerator.extend(wnode, module_path)
end

#parse_send_import(node, wnode, keep_eval) ⇒ Object

Directive to declare the current method in the WASM imports Example

import :module_name, :function_name

(send nil :import

(sym :mod)
(sym :func))



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# File 'lib/rlang/parser.rb', line 1570

def parse_send_import(node, wnode, keep_eval)
  logger.debug "Import directive found for..."
  rlse node, "export must be used in class scope" unless wnode.in_class_or_module_scope?
  rlse node, "import expects 2 arguments (got #{node.children.count - 2})" \
    unless node.children.count == 4
  
  module_node, function_node = node.children[2..-1]
  rlse node, "import module name must be a symbol (got #{module_node})" \
    unless module_node.type == :sym    
  rlse node, "import function name must be a symbol (got #{function_node})" \
    unless function_node.type == :sym
  @@import = true
  @@import_module_name   = module_node.children.last
  @@import_function_name = function_node.children.last
  logger.debug "... #{@@import_module_name}, #{@@import_function_name}"
  return
end

#parse_send_include(node, wnode, keep_eval) ⇒ Object

Directive to include a module current file Example include Kernel

(send nil :include

(const nil :Kernel))



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# File 'lib/rlang/parser.rb', line 1488

def parse_send_include(node, wnode, keep_eval)
  const_node = node.children.last
  module_path = _build_const_path(const_node)
  rlse node, "expecting a constant for include (got #{const_node})" \
    unless const_node.type == :const
  rlse node, "include must be used in class scope" \
    unless wnode.in_class_scope?
  @wgenerator.include(wnode, module_path)
end

#parse_send_inline(node, wnode, keep_eval) ⇒ Object

Directive to inline WAT / Ruby code the wat entry is used when the Rlang code is comiled to WAT code. The Ruby entry is used when the rlang code is simulated in plain Ruby CAUTION the inline code is supposed to always leave a value on the stack Example inline wat: ‘(call_indirect (type $insn_t) 

         (local.get $state) 
         (local.get $cf) 
         (local.get $opcodes) 
         (local.get $opcode) ;; instruction function pointer
       )',
ruby: 'call_indirect(state, cf, opcodes, opcode)'

(send, nil, :inline,

(hash
  (pair
    (sym :wat)
    (dstr
      (str "(call_indirect (type $insn_t) \n")
      (str "...")
        ...))
  (pair)
    (sym :wtype)
    (sym :I64)
  (pair
    (sym :ruby)
    (str "call_indirect(state, cf, opcodes, opcode)"))



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# File 'lib/rlang/parser.rb', line 1794

def parse_send_inline(node, wnode, keep_eval)
  rlse node, "inline can only happen in a method body or at root" \
    unless wnode.in_method_scope? || wnode.in_root_scope?
  hash_node = node.children.last
  rlse node, "inline expects a hash argument (got #{hash_node.type}" \
    unless hash_node.type == :hash

  # Find the :wat entry in hash
  logger.debug "Hash node: #{hash_node} "
  wat_node = hash_node.children.\
    find {|pair| sym_node, = *pair.children; sym_node.children.last == :wat}
  rlse node, "inline has no wat: hash entry" unless wat_node
  logger.debug "inline wat entry: #{wat_node}"

  # Find the :wtype entry in hash if any
  wtype_node = hash_node.children.\
    find {|pair| sym_node, = *pair.children; sym_node.children.last == :wtype}
  if wtype_node
    wtype = WType.new(wtype_node.children.last.children.last)
    logger.debug "inline wtype entry: #{wtype_node}"
  else
    wtype = WType::DEFAULT
  end
  logger.debug "wtype: #{wtype} "

  # Now extract the WAT code itself
  rlse node, "inline has no wat: hash entry" unless wat_node
  wcode_node = wat_node.children.last
  if wcode_node.type == :dstr
    # iterate over str children
    wat_code = wcode_node.children.collect {|n| n.children.last}.join('')
  elsif wcode_node.type == :str
    wat_code = wcode_node.children.last
  else
    rlse node, "inline WAT code must be a string (got #{wcode_node})"
  end
  wn_inline = @wgenerator.inline(wnode, wat_code, wtype)
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless (keep_eval || wtype.blank?)
  return wn_inline
end

#parse_send_instance_method_call(node, wnode, keep_eval) ⇒ Object

Instance Method lookup and native operator

In the example below mem_size would be recognized as a local var because it was not assigned a value before. It’s recognized as a tentative method call Example

some_var = mem_size + 10

(send

(send nil :mem_size) :+
(int 10))

Example for method call on class instance @@cvar.x = 100

(send

(cvar :@@cvar) :x= (int 100)

)

If receiver not self or const then it could be an arithmetic or relational operator or an operato overloaded in the related class

Example for binary op 1 + 2

(send

(int 1) :+
(int 2)

)

Example unary op !(n==1)

(send

 (begin
   (send (lvar :n) :== (int 1))
) :!)



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# File 'lib/rlang/parser.rb', line 1970

def parse_send_instance_method_call(node, wnode, keep_eval)
  logger.debug "Parsing instance method call..."
  recv_node = node.children[0]
  method_name = node.children[1]
  # Parse receiver node and temporarily attach it
  # to parent wnode. It will later become the first
  # argument of the method call by reparenting it
  logger.debug "Parsing instance method call #{method_name}, keep_eval: #{keep_eval}..."
  logger.debug "... on receiver #{recv_node}..."

  # parse the receiver node just to determine its wtype
  # if receiver node is nil it means the receiver is self
  wn_phony = @wgenerator.phony(wnode)
  wn_recv = recv_node.nil? ? parse_self(recv_node, wn_phony) : parse_node(recv_node, wn_phony)
  logger.debug "Parsed receiver : #{wn_recv} / wtype: #{wn_recv.wtype}"

  # Generate method call code
  wn_op = @wgenerator.send_method(wnode, wn_recv.wtype.class_path, method_name, :instance)

  # reparent the receiver wnode(s) to operator wnode
  wn_phony.reparent_children_to(wn_op)
  wnode.remove_child(wn_phony)

  # Grab all argument nodes, parse them and add them as child 
  # to the method call node
  arg_nodes = node.children[2..-1]
  wn_args = arg_nodes.collect do |n| 
    logger.debug "...with arg #{n}"
    parse_node(n, wn_op, true)
  end

  # now process operands (e.g. cast them if needed)
  @wgenerator.operands(wn_op, wn_recv, wn_args)
  logger.debug "After operands, call wnode: #{wn_op} wtype: #{wn_op.wtype}, wn_op children types: #{wn_op.children.map(&:wtype)}"

  # Drop last evaluated result if asked to or if
  # the method called doesn't return any value
  @wgenerator.drop(wnode) unless (keep_eval || wn_op.wtype.blank?)

  return wn_op
end

#parse_send_local(node, wnode, keep_eval) ⇒ Object

Directive to define local variable type this must be processed at compile time if method name is :local then it is a type definition for a local variable local :value, :I64

s(:send, nil, :local,

(hash
   (pair
     s(:sym, :value)
     s(:sym, :I64))

))



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# File 'lib/rlang/parser.rb', line 1600

def parse_send_local(node, wnode, keep_eval)
  rlse node, "local declaration can only be used in methods" \
    unless wnode.in_method_scope?
  hash_node = node.children.last
  local_types = parse_type_args(hash_node, :local)
  local_types.each do |name, wtype|
    lvar = wnode.find_or_create_lvar(name)
    rlse node, "couldn't find or create local variable #{name}" unless lvar
    lvar.wtype = WType.new(wtype)
  end
  return
end

#parse_send_method_lookup(node, wnode, keep_eval) ⇒ Object

Determine whether it’s an instance or class method call TODO : see how to remove identical code between class and instance method calls below



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# File 'lib/rlang/parser.rb', line 1839

def parse_send_method_lookup(node, wnode, keep_eval)
  recv_node = node.children[0]
  #method_name = node.children[1]
  #if wnode.in_class_scope? || wnode.in_class_method_scope? || wnode.in_root_scope?
    if recv_node.nil? || recv_node.type == :self
      if wnode.in_instance_method_scope?
        return parse_send_instance_method_call(node, wnode, keep_eval)
      else
        return parse_send_class_method_call(node, wnode, keep_eval)
      end
    elsif recv_node.type == :const
      const_path = _build_const_path(recv_node)
      # if this is a Constant, not a class
      # then it's actually an instance method call
      rlse node, "Unknown constant #{const_path}" unless (c = wnode.find_const(const_path))
      if (c.class? || c.module?)
        return parse_send_class_method_call(node, wnode, keep_eval)
      else
        return parse_send_instance_method_call(node, wnode, keep_eval)
      end            
    else
      return parse_send_instance_method_call(node, wnode, keep_eval)
    end
end

#parse_send_nil_receiver(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 1390

def parse_send_nil_receiver(node, wnode, keep_eval)
  recv_node = node.children[0]
  method_name = node.children[1]
  rlse node, "receiver should be nil here (got #{recv_node})" \
    unless recv_node.nil?

  if recv_node.nil? && method_name == :require
    return parse_send_require(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :require_relative
    return parse_send_require_relative(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :include
    return parse_send_include(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :prepend
    return parse_send_prepend(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :extend
    return parse_send_extend(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :export
    return parse_send_export(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :import
    return parse_send_import(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :local
    return parse_send_local(node, wnode, keep_eval)
  end

  if  recv_node.nil? && method_name == :arg
    return parse_send_arg(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :result 
    return parse_send_result(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name.to_s =~ /^attr_(reader|writer|accessor)/
    return parse_send_attr(node, wnode, keep_eval)
  end

  if recv_node.nil? && method_name == :attr_type
    return parse_send_attr_type(node, wnode, keep_eval)
  end

  if recv_node.nil? &&  method_name == :inline
    return parse_send_inline(node, wnode, keep_eval)
  end

  # All other cases : it is a regular method call
  return parse_send_method_lookup(node, wnode, keep_eval)
end

#parse_send_prepend(node, wnode, keep_eval) ⇒ Object

Directive to prepend a module current file Example prepend MyModule

(send nil :prepend

(const nil :MyModule))



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# File 'lib/rlang/parser.rb', line 1505

def parse_send_prepend(node, wnode, keep_eval)
  const_node = node.children.last
  module_path = _build_const_path(const_node)
  rlse node, "expecting a constant for prepend (got #{const_node})" \
    unless const_node.type == :const
  rlse node, "prepend must be used in class scope" \
    unless wnode.in_class_scope?
  @wgenerator.prepend(wnode, module_path)
end

#parse_send_require(node, wnode, keep_eval) ⇒ Object

Directive to require a file Example (send nil :require

(str "test5"))



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# File 'lib/rlang/parser.rb', line 1456

def parse_send_require(node, wnode, keep_eval)
  rlse node, "require must be used at root level" \
    unless wnode.in_root_scope?
  file_node = node.children.last
  rlse node, "require only accepts a string argument (got #{file_node})" \
    unless file_node.type == :str
  parse_require(wnode, file_node.children.last)
  return
end

#parse_send_require_relative(node, wnode, keep_eval) ⇒ Object

Directive to require_a file relative to current file Example (send nil :require_relative

(str "test5"))



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# File 'lib/rlang/parser.rb', line 1471

def parse_send_require_relative(node, wnode, keep_eval)
  rlse node, "require_relative must be used at root level" \
    unless wnode.in_root_scope?
  file_node = node.children.last
  rlse node, "require only accepts a string argument (got #{file_node})" \
    unless file_node.type == :str
  parse_require_relative(wnode, file_node.children.last)
  return
end

#parse_send_result(node, wnode, keep_eval) ⇒ Object

result directive in method scope

Directive to define method return type in the method itself this must be processed at compile time Supported types : :I32, :I64, :none (:nil means no value is returned)

Example result :I64

s(:send, nil, :result,

s(:sym, :I64))

result directive in class scope

Directive to define method return type at the class level. This allows to declare a method type before the method is parsed this must be processed at compile time Supported types : :I32, :I64, :none (:none means no value is returned)

Example result :MyClass, :split, :I64 result :“ClassA::MyClass”, :split, :Header

s(:send, nil, :result,

s(:sym, :class_path),
s(:sym, :method_name),
s(:sym, :I64))

if name starts with # it’s a n instance method, otherwise a class method Note: class path can be either A or A::B



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# File 'lib/rlang/parser.rb', line 1673

def parse_send_result(node, wnode, keep_eval)
  if wnode.in_method_scope?
    result_type, = *node.children[2]
    rlse node, "result directive expects a symbol argument (got #{result_type})" \
      unless result_type.is_a? Symbol
    wnode.method_wnode.wtype = WType.new(result_type)
    logger.debug "result_type #{result_type} updated for method #{wnode.method_wnode.method}"
  elsif wnode.in_class_scope?
    class_path_name,  = *node.children[2]
    method_name, = *node.children[3]
    result_type, = *node.children[4]
    rlse node, "result directive expects a symbol argument (got #{result_type}) in node #{node}" \
      unless result_type.is_a? Symbol
    @wgenerator.declare_method(wnode, WType.new(class_path_name), method_name.to_sym, result_type)
  else
    rlse node, "result declaration not supported #{wn.scope} scope"
  end
  return
end

#parse_string(node, wnode, keep_eval) ⇒ Object

When a string literal initializer is used in root or class scope, the string literal is allocated statically. If the initializer is used in a method scope we instantiate a dynamic string object and copy the initial static value in it



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# File 'lib/rlang/parser.rb', line 909

def parse_string(node, wnode, keep_eval)
  string = node.children.last
  if wnode.in_method_scope?
    # allocate string dynamically
    wn_string = @wgenerator.string_dynamic_new(wnode, string)
  else
    # allocate string statically
    wn_string = @wgenerator.string_static_new(wnode, string)
  end
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval

  logger.debug "wn_string:#{wn_string} wtype:#{wn_string.wtype} keep_eval:#{keep_eval}"
  return wn_string
end

#parse_true(node, wnode, keep_eval) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 885

def parse_true(node, wnode, keep_eval)
  wn_true = @wgenerator.int(wnode, WType::DEFAULT, 1)
  # Drop last evaluated result if asked to
  @wgenerator.drop(wnode) unless keep_eval

  logger.debug "wn_true:#{wn_true} wtype:#{wn_true.wtype} keep_eval:#{keep_eval}"
  return wn_true
end

#parse_type_args(hash_node, entity) ⇒ Object 



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# File 'lib/rlang/parser.rb', line 2012

def parse_type_args(hash_node, entity)
  types = {}
  # Is this a hash Node ?
  unless hash_node.respond_to?(:type) && hash_node.type == :hash
    rlse hash_node, "#{entity} expects a hash argument (got #{hash_node}" \
  end
  logger.debug "#{entity} hash node: #{hash_node}"
  hash_node.children.each do |pair_node|
    name_node, type_node = pair_node.children
    rlse name_node, "The name of an #{entity} must be a symbol (got #{name_node})" \
      unless name_node.type == :sym
    rlse type_node, "The type of an #{entity} must be a symbol (got #{type_node})" \
      unless type_node.type == :sym
    name = name_node.children.last
    type = type_node.children.last
    types[name] = type
  end
  types
end

#parse_while_without_result_type(node, wnode, keep_eval) ⇒ Object

Example (while (cond)

(body)

end

(block $lbl_xx

(loop $lbl_yy
  (br_if $lbl_xx (ixx.eqz (cond)))
  (body)
  (br $lbl_yy)
)

)



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# File 'lib/rlang/parser.rb', line 2236

def parse_while_without_result_type(node, wnode, keep_eval)
  cond_node, body_node = *node.children
  wn_while,wn_while_cond,wn_body = @wgenerator.while(wnode)

  # Parse the while condition... 
  # Plus negate the condition if it's a while statement
  # Keep it as is for a until statement
  wn_cond_exp = parse_node(cond_node, wn_while_cond)
  if node.type == :while
    @wgenerator.while_cond(wn_while_cond, wn_cond_exp)
  end

  # Parse the body of the while block and 
  # do not keep the last evaluated expression
  parse_node(body_node, wn_body, false)
  @wgenerator.while_end(wn_body)
  return wn_while
end