Class: Rlang::Parser::DAta

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

Constant Summary collapse

TMPL = 
'(data 0 (i32.const %{addr}) "%{value}") ;; %{comment}'
@@label_table = 
{}
@@current_address = 
0

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Log

included, logger, #logger, logger=

Constructor Details

#initialize(label, value, wtype = WType::DEFAULT) ⇒ DAta

NOTE: new and append only takes individual DAta values not an array of values TODO: fix DAta.new and DAta.append not accepting an array of values



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# File 'lib/rlang/parser/data.rb', line 23

def initialize(label, value, wtype=WType::DEFAULT)
  raise "Data label '#{label}' already initialized" \
    if self.class.exist? label
  logger.debug "@@current_address: #{@@current_address}"
  @label = label
  @wtype = wtype
  @address = @@current_address
  @@label_table[@label] = self
  @value = []
  self.append_value(value, wtype)
  logger.debug "New Data[#{@label}] initialized with #{@value} at address #{@address} / new current address: #{@@current_address}"
end

Instance Attribute Details

#address ⇒ Object (readonly)

Returns the value of attribute address.



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# File 'lib/rlang/parser/data.rb', line 18

def address
  @address
end

#label ⇒ Object (readonly)

Returns the value of attribute label.



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# File 'lib/rlang/parser/data.rb', line 18

def label
  @label
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/rlang/parser/data.rb', line 18

def value
  @value
end

#wtype ⇒ Object (readonly)

Returns the value of attribute wtype.



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# File 'lib/rlang/parser/data.rb', line 18

def wtype
  @wtype
end

Class Method Details

.[](label) ⇒ Object 



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# File 'lib/rlang/parser/data.rb', line 65

def self.[](label)
  raise "Unknown data label '#{label}'" unless self.exist? label
  @@label_table[label].address
end

.address=(address) ⇒ Object 



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# File 'lib/rlang/parser/data.rb', line 81

def self.address=(address)
  logger.fatal "ERROR!! Cannot decrease current DAta address (was #{@@current_address}, got #{address}) " \
    if address < @@current_address
  @@current_address = address
end

.align(n) ⇒ Object

Align current address to closest multiple of n by higher value



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# File 'lib/rlang/parser/data.rb', line 89

def self.align(n)
  if (m = @@current_address % n) != 0
    @@current_address = (@@current_address - m) + n
  end
  logger.debug "Aligning current address to #{@@current_address}"
  @@current_address
end

.append(label, value, wtype = WType::DEFAULT) ⇒ Object

Append a value to the DAta object identified by the label and return this DAta object object



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# File 'lib/rlang/parser/data.rb', line 72

def self.append(label, value, wtype=WType::DEFAULT)
  logger.debug "appending #{value} to DAta[#{label}]"
  if self.exist? label
    @@label_table[label].append_value(value, wtype)
  else
    self.new(label, value, wtype)
  end
end

.exist?(label) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rlang/parser/data.rb', line 61

def self.exist?(label)
  @@label_table.has_key? label
end

.reset! ⇒ Object 



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# File 'lib/rlang/parser/data.rb', line 36

def self.reset!
  @@label_table = {}
  @@current_address = 0
end

.transpile(depth) ⇒ Object

Transpile data to WAT code in order of increasing address



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# File 'lib/rlang/parser/data.rb', line 99

def self.transpile(depth)
  indent = ' ' * depth * 2
  output = []
  @@label_table.sort_by {|s,d| d.address}.each do |s,d|
    logger.debug "Generating data #{d.inspect}"
    address = d.address
    d.value.each do |elt|
      if elt.is_a? String
        output << TMPL % {addr: address, value: elt.to_wasm, comment: s}
        address += d.value.size
      elsif elt.is_a? Integer
        output << TMPL % {addr: address, value: elt.to_little_endian(d.wtype.size), comment: "(#{elt} #{s})"}
        address += d.wtype.size
      elsif elt.is_a? DAta
        output << TMPL % {addr: address, value: elt.address.to_little_endian(d.wtype.size), comment: "(#{elt} #{s})"}
        address += d.wtype.size
      else
        raise "Unknown Data type: #{value.class}"
      end
    end
  end
  indent + output.join("\n #{indent}")
end

Instance Method Details

#aligned? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rlang/parser/data.rb', line 57

def aligned?
  (@@current_address % @wtype.size) == 0
end

#append_value(value, wtype) ⇒ Object

Append a value to the DAta object and return this DAta object



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# File 'lib/rlang/parser/data.rb', line 43

def append_value(value, wtype)
  logger.warn "Data type #{@wtype} misaligned!!! (Data[:#{@label}] value #{value} at address #{@address}" \
    unless self.aligned?
  @value << value
  if value.is_a? String
    @@current_address += value.length
  else
    @@current_address += @wtype.size
  end
  # Always make sure current address is aligned
  self.class.align(WType::DEFAULT.size)
  self
end