copies of the old code to start the new layer

lib/ast/if_expression.rb

@@ -0,0 +1,41 @@
+module Ast
+  class IfExpression < Expression
+#    attr_reader  :cond, :if_true, :if_false
+    def compile context
+      f = context.function
+      # to execute the logic as the if states it, the blocks are the other way around
+      # so we can the jump over the else if true ,and the else joins unconditionally after the true_block
+      merge_block = f.new_block "if_merge"
+      true_block = f.new_block "if_true"
+      false_block = f.new_block "if_false"
+
+      puts "compiling if condition #{cond}"
+      cond_val = cond.compile(context)
+      unless cond_val.is_a? Vm::BranchCondition
+        cond_val = cond_val.is_true? f
+      end
+      f.b true_block , condition_code: cond_val.operator
+      f.insertion_point.branch = true_block
+
+      f.insert_at false_block
+      if_false.each do |part|
+        puts "compiling in if false #{part}"
+        last = part.compile(context  )
+      end
+      f.b merge_block
+      f.insertion_point.branch = false_block
+
+      f.insert_at true_block
+      last = nil
+      if_true.each do |part|
+        puts "compiling in if true #{part}"
+        last = part.compile(context )
+      end
+
+      puts "compiled if: end"
+      f.insert_at merge_block
+
+      return last
+    end
+  end
+end