From e706b5e42140d961ccda780c044152017c21912f Mon Sep 17 00:00:00 2001
From: inglorion <voodoo@inglorion.net>
Date: Sun, 10 Feb 2013 16:48:34 +0100
Subject: [PATCH] keep track of saved registers on MIPS

---
 lib/voodoo/generators/mips_gas_generator.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/voodoo/generators/mips_gas_generator.rb b/lib/voodoo/generators/mips_gas_generator.rb
index 10e2e44..cf1a690 100644
--- a/lib/voodoo/generators/mips_gas_generator.rb
+++ b/lib/voodoo/generators/mips_gas_generator.rb
@@ -353,6 +353,7 @@ module Voodoo
         @frame_size = @frame_size + (nlocals * @WORDSIZE + 7) / 8 * 8
       end
       grow_stack @frame_size
+      @saved_registers = []
     end
 
     def emit_align alignment
@@ -409,6 +410,7 @@ module Voodoo
       [@NREGISTER_LOCALS, @environment.locals].min.times do |n|
         emit "lw #{local_register n}, #{local_reference n}\n"
       end
+      @saved_registers = []
       # Load return address
       emit "lw $31, #{@RA_OFFSET}($fp)\n"
       # Restore stack pointer
@@ -428,6 +430,7 @@ module Voodoo
       # If we are returning to top level, restore stack pointer
       if @environment.parent == @top_level
         grow_stack -@frame_size
+        @saved_registers = []
       end
 
       # Restore old value of @environment
@@ -630,6 +633,7 @@ module Voodoo
         @environment.add_local symbol, register
         # Save current value of register
         emit "sw #{register}, #{ref}\n"
+        @saved_registers << register
         # Set new value
         eval_expr expr, register
       else
-- 
2.11.4.GIT