remove the old add_new_int and calls

last orrurences in syscalls replaced, 2 variants
- exit does not actually need the int
- all else, preallocate the int beforehand and in syscall assume the reg name (integer_tmp)

test missing

lib/mom/instruction/resolve_method.rb

@@ -58,7 +58,10 @@ module Mom
         branch  while_start_label
 
         add_code exit_label
-        Risc::Builtin::Object.emit_syscall( builder , :exit )
+        # temporary, need to raise really.
+        factory! << Parfait.object_space.get_factory_for(:Integer)
+        integer_tmp! << factory[:reserve]
+        Risc::Builtin::Object.emit_syscall( builder , :exit ) #uses integer_tmp
 
         add_code ok_label
         cache_entry[:cached_method] << callable_method

lib/risc/builder.rb

@@ -38,7 +38,7 @@ module Risc
         if last_char == "!" or last_char == "?"
           if @names.has_key?(name)
             return @names[name] if last_char == "?"
-            raise "Name exists before creating it #{name}#{last_char}"
+            raise "Name exists (#{@names.keys})before creating it #{name}#{last_char}"
           end
         else
           raise "Must create (with ! or ?) before using #{name}#{last_char}"
@@ -50,7 +50,7 @@ module Risc
       reg
     end
 
-    # Infer the type from a symbol. In the simplest case the sybbol is the class name.
+    # Infer the type from a symbol. In the simplest case the symbol is the class name.
     # But in building, sometimes variations are needed, so next_message or caller work
     # too (and both return "Message")
     # A general "_reg"/"_obj"/"_const" or "_tmp" at the end of the name will be removed
@@ -114,8 +114,8 @@ module Risc
       compiler.reset_regs
     end
 
-    # Build code using dsl (see __init__ or MessageSetup for examples)
-    # names (that ruby would resolve to a variable/method) are converted
+    # Build code using dsl (see __init__ or MessageSetup for examples).
+    # Names (that ruby would resolve to a variable/method) are converted
     # to registers. << means assignment and [] is supported both on
     # L and R values (but only one at a time). R values may also be constants.
     #
@@ -123,7 +123,7 @@ module Risc
     # Transfer instructions with extremely readable code.
     # example:
     #  space << Parfait.object_space # load constant
-    #  message[:receiver] << space  #make current message (r0) receiver the space
+    #  message[:receiver] << space  #make current message's (r0) receiver the space
     #
     # build result is added to compiler directly
     #
@@ -137,22 +137,37 @@ module Risc
       return ins
     end
 
+    # for some methods that return an integer it is beneficial to pre allocate the
+    # integer and store it in the return value. That is what this function does.
+    #
+    # Those (builtin) methods, mostly syscall wrappers then go on to do this and that
+    # clobbering registers and so the allocate and even move would be difficult.
+    # We sidestep all that by pre-allocating.
+    def prepare_int_return
+      integer_tmp = allocate_int
+      build do
+        message[:return_value] << integer_tmp
+      end
+    end
+
     # allocate int fetches a new int, for sure. It is a builder method, rather than
     # an inbuilt one, to avoid call overhead for 99.9%
     # The factories allocate in 1k, so only when that runs out do we really need a call.
     # Note:
     #   Unfortunately (or so me thinks), this creates code bloat, as the calling is
-    #   included in 100%, but only needed in 0.1. Risc-levelBlocks or Macros may be needed.
-    #   as the calling in (the same) 30-40 instructions for every basic int op.
+    #   included in 100%, but only needed in 0.1. Risc-level Blocks or Macros may be needed.
+    #   as the calling in (the same) 40-50 instructions for every basic int op.
     #
     # The method
     # - grabs a Integer instance from the Integer factory
     # - checks for nil and calls (get_more) for more if needed
-    # - returns the RiscValue (Regster) where the object is found
+    # - returns the RiscValue (Register) where the object is found
     #
     # The implicit condition is that the method is called at the entry of a method.
     # It uses a fair few registers and resets all at the end. The returned object
-    # will always be in r1, because the method resets, and all others will be clobbered
+    # will always be in r1, because the method resets, and all others will be clobbered.
+    #
+    # Return RegisterValue(:r1) that will be named integer_tmp
     def allocate_int
       compiler.reset_regs
       integer = self.integer!
@@ -194,17 +209,6 @@ module Risc
       Mom::SimpleCall.new(calling).to_risc(compiler)
     end
 
-    def add_new_int( source , from, to )
-      to.set_builder( self )    # esecially div10 comes in without having used builder
-      from.set_builder( self )  # not named regs, different regs ==> silent errors
-      build do
-        factory! << Parfait.object_space.get_factory_for(:Integer)
-        to << factory[:next_object]
-        integer_2! << to[:next_integer]
-        factory[:next_object] << integer_2
-        to[Parfait::Integer.integer_index] << from
-      end
-    end
   end
 
 end

lib/risc/builtin/object.rb

@@ -41,7 +41,9 @@ module Risc
         # Even if it's just this one, sys_exit (later raise)
         def _method_missing( context )
           compiler = compiler_for(:Object,:method_missing ,{})
-          emit_syscall( compiler.builder(compiler.source) , :exit )
+          builder = compiler.builder(compiler.source)
+          builder.prepare_int_return # makes integer_tmp variable as return
+          emit_syscall( builder , :exit )
           return compiler
         end
 
@@ -83,6 +85,16 @@ module Risc
           return compiler
         end
 
+        # the exit function
+        # mainly calls exit_sequence
+        def exit( context )
+          compiler = compiler_for(:Object,:exit ,{})
+          builder = compiler.builder(compiler.source)
+          builder.prepare_int_return # makes integer_tmp variable as return
+          exit_sequence(builder)
+          return compiler
+        end
+
         # a sort of inline version of exit method.
         # Used by exit and __init__ (so it doesn't have to call it)
         # Assumes int return value and extracts the fixnum for process exit code
@@ -95,15 +107,6 @@ module Risc
           end
         end
 
-        # the exit function
-        # mainly calls exit_sequence
-        def exit( context )
-          compiler = compiler_for(:Object,:exit ,{})
-          builder = compiler.builder(compiler.source)
-          exit_sequence(builder)
-          return compiler
-        end
-
         # emit the syscall with given name
         # there is a Syscall instruction, but the message has to be saved and restored
         def emit_syscall( builder , name )
@@ -128,12 +131,10 @@ module Risc
         # the int gets retured, ie is the return_value of the message
         def restore_message(builder)
           r8 = RegisterValue.new( :r8 , :Message)
-          int = builder.compiler.use_reg(:Integer)
           builder.build do
             integer_reg! << message
             message << r8
-            add_new_int( "_restore_message", integer_reg , int )
-            message[:return_value] << int
+            integer_tmp[Parfait::Integer.integer_index] << integer_reg
           end
         end
 

lib/risc/builtin/word.rb

@@ -13,6 +13,7 @@ module Risc
         def putstring( context)
           compiler = compiler_for(:Word , :putstring ,{})
           builder = compiler.builder(compiler.source)
+          builder.prepare_int_return # makes integer_tmp variable as return
           builder.build do
             word! << message[:receiver]
             integer! << word[Parfait::Word.get_length_index]