Module: Generator

Included in:
SpecialGiggle
Defined in:
lib/special-giggle/generator.rb

Defined Under Namespace

Classes: GeneratorError, Token

Constant Summary collapse

BinaryOps = 
{
  :Plus         => 50,
  :Minus        => 50,
  :Asterisk     => 60,
  :Slash        => 60,
  :Percent      => 60,
  :Bar          => 10,
  :Ampersand    => 30,
  :Caret        => 20,
  :LeftShift    => 40,
  :RightShift   => 40,
}
UnaryOps = 
{
  :Tilde        => 70,
  :Negative     => 80,
}
Vars = 
Array.new

Class Method Summary collapse

Class Method Details

.generate(token) ⇒ Object 



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# File 'lib/special-giggle/generator.rb', line 110

def self.generate(token)
  array = Array.new
  token.child.each do |statement|
    array << generate_statement(statement)
  end

  output = %{
.section .data
__print_fmt:
.string "%ld\\n"

.section .text
.globl main
main:
pushq %rbp
movq %rsp, %rbp
subq <VARIABLE>, %rsp

<CODE>
movq %rbp, %rsp
popq %rbp
movq $0, %rax
retq
}
  text = ""
  array.flatten.each { |ops| ops.to_code.each { |line| text += " " * 2 + line + "\n" } }

  Vars.length.times do |i|
    regex = "(?<![\\w])#{Vars[i]}(?![\\w])"
    text.gsub!(/#{regex}/, i > 0 ? "#{8*i}(%rsp)" : "(%rsp)")
  end
  output.gsub('<VARIABLE>', "$#{Vars.length * 8}").gsub('<CODE>', text)
end

.generate_expression(token) ⇒ Object 



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# File 'lib/special-giggle/generator.rb', line 73

def self.generate_expression(token)
  if token.type == :Number
    t = var_temp
    [t, [Token.new(:Move, token.child[0], t)]]
  elsif token.type == :Variable
    [token.child[0], []]
  elsif token.type == :Bracket
    var, array = generate_expression(token.child[0])
    t = var_temp
    [t, [array, Token.new(:Move, var, t)]]
  elsif UnaryOps.include?(token.type)
    var, array = generate_expression(token.child[0])
    t = var_temp
    [t, [array, Token.new(token.type, var, t)]]
  else
    var1, array1 = generate_expression(token.child[0])
    var2, array2 = generate_expression(token.child[1])
    t = var_temp
    [t, [array1, array2, Token.new(token.type, [var1, var2], t)]]
  end
end

.generate_statement(token) ⇒ Object 



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# File 'lib/special-giggle/generator.rb', line 95

def self.generate_statement(token)
  array = Array.new
  if token.type == :Print
    var, garray = generate_expression(token.child[0])
    array << garray unless garray.empty?
    array << Token.new(:Print, var)
  elsif token.type == :Move
    Vars << token.child[0].child[0] unless Vars.include?(token.child[0].child[0])
    var, garray = generate_expression(token.child[1])
    array << garray unless garray.empty?
    array << Token.new(:Move, var, token.child[0].child[0])
  end
  array
end

.var_temp ⇒ Object 



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# File 'lib/special-giggle/generator.rb', line 66

def self.var_temp
  #var = "#{8 * Vars.length}(%rsp)"
  var = "tmp_#{Vars.length}"
  Vars << var unless Vars.include?(var)
  var
end