Start unit testing for functions in nc_inst_state.c

src/trusted/validator_x86/nc_inst_iter.c

 /*
  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * Defines an instruction (decoder) iterator that processes code segments.
  */
 
@@ skipping 56 matching lines @@
 
 NaClInstIter* NaClInstIterCreate(NaClSegment* segment) {
   return NaClInstIterCreateWithLookback(segment, 0);
 }
 
 void NaClInstIterDestroy(NaClInstIter* iter) {
   free(iter->buffer);
   free(iter);
 }
 
+NaClInstState* NaClInstIterGetUndecodedState(NaClInstIter* iter) {
+  return &iter->buffer[iter->buffer_index];
+}
+
 NaClInstState* NaClInstIterGetState(NaClInstIter* iter) {
-  NaClInstState* state = &iter->buffer[iter->buffer_index];
+  NaClInstState* state = NaClInstIterGetUndecodedState(iter);
   if (NULL == state->inst) {
     NaClDecodeInst(iter, state);
   }
   return state;
 }
 
 Bool NaClInstIterHasLookbackState(NaClInstIter* iter, size_t distance) {
   return distance < iter->buffer_size && distance <= iter->inst_count;
 }
 
@@ skipping 32 matching lines @@
               iter->index, iter->buffer_index));
   iter->buffer[iter->buffer_index].inst = NULL;
 }
 
 uint8_t* NaClInstIterGetInstMemory(NaClInstIter* iter) {
   if (iter->index >= iter->segment->size) {
     NaClInstIterFatal("NaClInstIterGetInstMemory with no next element.");
   }
   return iter->segment->mbase + iter->index;
 }