* src/SDCCsymt.h,

[fw/sdcc] / src / hc08 / ralloc.c

diff --git a/src/hc08/ralloc.c b/src/hc08/ralloc.c
index be4a1c977ebce08c6d594969155ca09f01e06c4b..ee599f19353b95df7c0a021a1dfa297b7062ab6e 100644 (file)
--- a/src/hc08/ralloc.c
+++ b/src/hc08/ralloc.c
@@ -1169,6 +1169,32 @@ xchgPositions:
   return change;
 }
 
+/*------------------------------------------------------------------*/
+/* verifyRegsAssigned - make sure an iTemp is properly initialized; */
+/* it should either have registers or have beed spilled. Otherwise, */
+/* there was an uninitialized variable, so just spill this to get   */
+/* the operand in a valid state.                                    */
+/*------------------------------------------------------------------*/
+static void
+verifyRegsAssigned (operand *op, iCode * ic)
+{
+  symbol * sym;
+  
+  if (!op) return;
+  if (!IS_ITEMP (op)) return;
+  
+  sym = OP_SYMBOL (op);
+  if (sym->isspilt) return;
+  if (!sym->nRegs) return;
+  if (sym->regs[0]) return;
+  
+  werrorfl (ic->filename, ic->lineno, W_LOCAL_NOINIT, 
+           sym->prereqv ? sym->prereqv->name : sym->name);
+  spillThis (sym);
+}
+
+
+
 /*-----------------------------------------------------------------*/
 /* serialRegAssign - serially allocate registers to the variables  */
 /*-----------------------------------------------------------------*/
@@ -1329,6 +1355,40 @@ serialRegAssign (eBBlock ** ebbs, int count)
            }
        }
     }
+
+    /* Check for and fix any problems with uninitialized operands */
+    for (i = 0; i < count; i++)
+      {
+       iCode *ic;
+
+       if (ebbs[i]->noPath &&
+           (ebbs[i]->entryLabel != entryLabel &&
+            ebbs[i]->entryLabel != returnLabel))
+           continue;
+
+       for (ic = ebbs[i]->sch; ic; ic = ic->next)
+         {
+           if (SKIP_IC2 (ic))
+             continue;
+
+           if (ic->op == IFX)
+             {
+               verifyRegsAssigned (IC_COND (ic), ic);
+               continue;
+             }
+
+           if (ic->op == JUMPTABLE)
+             {
+               verifyRegsAssigned (IC_JTCOND (ic), ic);
+               continue;
+             }
+
+           verifyRegsAssigned (IC_RESULT (ic), ic);
+           verifyRegsAssigned (IC_LEFT (ic), ic);
+           verifyRegsAssigned (IC_RIGHT (ic), ic);
+          }
+      }    
+
 }
 
 /*-----------------------------------------------------------------*/