diff -r 99e534728b76 -r 5df4a112967d src/compiler/BytecodeEmitter.cpp
--- a/src/compiler/BytecodeEmitter.cpp	Sun Nov 18 22:18:23 2012 -0800
+++ b/src/compiler/BytecodeEmitter.cpp	Mon Nov 19 01:13:44 2012 -0800
@@ -216,6 +216,7 @@
 void
 BytecodeEmitter::getlocal(VariableSymbol *var)
 {
+    assert(var->storage() == VariableSymbol::Local);
     ensure(OP_GETLOCAL_LENGTH);
     writeOp(OP_GETLOCAL);
     writeUint32(var->slot());
@@ -226,6 +227,7 @@
 void
 BytecodeEmitter::setlocal(VariableSymbol *var)
 {
+    assert(var->storage() == VariableSymbol::Local);
     ensure(OP_SETLOCAL_LENGTH);
     writeOp(OP_SETLOCAL);
     writeUint32(var->slot());
@@ -233,6 +235,28 @@
         markOop(1);
 }
 
+void
+BytecodeEmitter::getarg(VariableSymbol *var)
+{
+    assert(var->storage() == VariableSymbol::Arg);
+    ensure(OP_GETARG_LENGTH);
+    writeOp(OP_GETARG);
+    writeUint32(var->slot());
+    if (var->type()->isTraceable())
+        markOop(1);
+}
+
+void
+BytecodeEmitter::setarg(VariableSymbol *var)
+{
+    assert(var->storage() == VariableSymbol::Arg);
+    ensure(OP_SETARG_LENGTH);
+    writeOp(OP_SETARG);
+    writeUint32(var->slot());
+    if (var->type()->isTraceable())
+        markOop(1);
+}
+
 bool
 BytecodeEmitter::allocate(VariableSymbol *sym)
 {