Code Generator

code_generator.rb

require 'llvm/core'
require 'llvm/execution_engine'

class Gerador

  def initialize(syntax_tree)
    @tree = syntax_tree
  end

  def compile
    LLVM.init_x86
    @module = LLVM::Module.new("pasc")
    @builder = LLVM::Builder.new
    @function = @module.functions.add("main", [LLVM::Int], LLVM::Int)
    @basic_block = @function.basic_blocks.append
    @builder.position_at_end(@basic_block)
    @locals = Hash.new

    generate_code

    @builder.ret_void

    p
    @module.dump
    @module.verify
    # Execution objects.
    @engine = LLVM::JITCompiler.new(@module)
    @fpm = LLVM::FunctionPassManager.new(@engine, @module)
    # Add passes to the Function Pass Manager.
    @fpm << :instcombine
    @fpm << :reassociate
    @fpm << :gvn
    @fpm << :simplifycfg

    @function
  end

  def optimize(function)
    @fpm.run(function)
  end

  private

  def generate_code
    @tree.generate_code @function, @locals, @builder, @basic_block
  end

end