better testing for small assembly (for coming changes)

lib/elf/text_section.rb

@@ -14,6 +14,12 @@ module Elf
       Elf::Constants::SHF_WRITE | Elf::Constants::SHF_ALLOC | Elf::Constants::SHF_EXECINSTR
     end
   
+    def length
+      @text.length
+    end
+    def to_s
+      "[" + @text.bytes.join(",") + "]"
+    end
     def alignment
       4
     end

lib/vm/block.rb

@@ -63,6 +63,9 @@ module Vm
       end
     end
     
+    def at where 
+      @current = where
+    end
     # set the next executed block after self.
     # why is this useful? if it's unconditional, why not merge them:
     #    So the second block can be used as a jump target. You standard loop needs a block to setup
@@ -74,7 +77,10 @@ module Vm
     # sugar to create instructions easily. Any method with one arg is sent to the machine and the result
     # (hopefully an instruction) added as code
     def method_missing(meth, *args, &block)
-      raise "hallo" if( meth.to_s[-1] == "=")
+      if( meth.to_s[-1] == "=")
+        val = @current.eval  meth.to_s[0 ... -1]
+        raise "hallo #{val}" 
+      end
       add_code CMachine.instance.send(meth , *args)
     end
 

test/arm/test_fibo.rb

@@ -13,8 +13,8 @@ class TestFibo < MiniTest::Test
     fibo  = @program.get_or_create_function(:fibo)
     @program.main.mov( int , 10 )
     @program.main.call( fibo )
-    putint = @program.get_or_create_function(:putint)
-    @program.main.call( putint )
+#    putint = @program.get_or_create_function(:putint)
+#    @program.main.call( putint )
     write 20 , "fibo"
   end
   

test/arm/test_small_program.rb

@@ -22,6 +22,7 @@ class TestSmallProg < MiniTest::Test
         bne  start  ,{}         #3
       end
     end
+    @should = [0,176,160,227,5,0,160,227,1,0,80,226,253,255,255,26,1,112,160,227,0,0,0,239]
     write( 6 , "loop" )
   end
 
@@ -35,17 +36,18 @@ class TestSmallProg < MiniTest::Test
       mov :r2 ,  hello.length
     	swi  0          #software interupt, ie kernel syscall
     end
+    @should = [0,176,160,227,4,112,160,227,1,0,160,227,12,16,143,226,16,32,160,227,0,0,0,239,1,112,160,227,0,0,0,239,72,101,108,108,111,32,82,97,105,115,97,10,0,0,0,0]
     write(7 + hello.length/4 + 1 , 'hello')
   end
 
   #helper to write the file
   def write len ,name
-    writer = Elf::ObjectWriter.new(Elf::Constants::TARGET_ARM)
-    io = @program.assemble(StringIO.new)
-    assembly = io.string
-    assert_equal len * 4 , assembly.length 
-    writer.set_text assembly
-    writer.save("#{name}_test.o")    
+    writer = Elf::ObjectWriter.new(@program , Elf::Constants::TARGET_ARM)
+    assembly = writer.text
+    assembly.text.bytes.each_with_index do |byte , index|
+      assert_equal  byte , @should[index] , "byte #{index}"
+    end
+#    writer.save("#{name}_test.o")
   end
 end
 # _start copied from dietc