Added basic test of STDIN, and hacky first version of IO#getc

features/compiler.feature

@@ -37,6 +37,7 @@ Feature: Compiler
     | inputs/06print.rb       | outputs/06print.txt       | Basic print/puts support                           |
     | inputs/interpolate.rb   | outputs/interpolate.txt   | Simple string interpolation                        |
     | inputs/div.rb           | outputs/div.txt           | Repeated divs to check register alloc.             |
-    | inputs/stdout.rb        | outputs/stdout.txt        | Test basic STDIN/STDOUT                            |
+    | inputs/stdout.rb        | outputs/stdout.txt        | Test basic STDOUT                                  |
+    | inputs/stdin.rb         | outputs/stdin.txt         | Test basic STDIN                                   |
 
 

features/inputs/stdin.rb

@@ -0,0 +1 @@
+puts STDIN.getc

features/outputs/stdin.txt

@@ -0,0 +1 @@
+116

features/step_definitions/compiler_steps.rb

@@ -37,7 +37,7 @@
       Tempfile.open('ruby-compiler') do |exe|
         STDERR.puts "Asm file is in #{tmp.path}.s"
         `gcc -gstabs -o #{exe.path}-binary #{tmp.path}.s ./runtime.o`
-        @output = `#{exe.path}-binary`
+        @output = `echo test | #{exe.path}-binary`
       end
     end
   end

lib/core/io.rb

@@ -1,11 +1,31 @@
 
 class IO < Object
+  def initialize
+#    %s(puts "IO.new")
+  end
+
   def getc
+    c = 0
+    tmp = 0
+
+    # FIXME: This code is specific to a 32 bit little endian
+    # arch, and is also horribly inefficient because we don't
+    # have an easy way of getting the address of a stack allocated
+    # variable.
+    %s(do
+         (assign tmp (malloc 4))
+         (assign (index tmp 0) 0)
+         (read 0 tmp 1)
+         (assign c (__get_fixnum (index tmp 0)))
+         (free tmp)
+         )
+    c
   end
 
   def file?
   end
 
   def path
   end
+
 end