Refactor the process of choosing validators.

src/trusted/service_runtime/sel_ldr.c

 /*
  * Copyright (c) 2012 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.
  */
 
 #include <string.h>
 
 /*
  * NaCl Simple/secure ELF loader (NaCl SEL).
@@ skipping 57 matching lines @@
   struct NaClDescEffectorLdr  *effp;
 
   /* Get the set of features that the CPU we're running on supports. */
   /* These may be adjusted later in sel_main.c for fixed-feature CPU mode. */
   NaClGetCurrentCPUFeatures(&nap->cpu_features);
   nap->fixed_feature_cpu_mode = 0;
 
   /* The validation cache will be injected later, if it exists. */
   nap->validation_cache = NULL;
 
-  nap->enable_dfa_validator = 0;
+  nap->validator = NULL;
 
   nap->addr_bits = NACL_MAX_ADDR_BITS;
 
   nap->stack_size = NACL_DEFAULT_STACK_MAX;
 
   nap->aux_info = NULL;
 
   nap->mem_start = 0;
 
 #if (NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86 \
@@ skipping 1659 matching lines @@
   nacl_global_xlate_base = mem_start;
 
   NaClSandboxMemoryStartForValgrind(mem_start);
 
   _ovly_debug_event();
 }
 
 void NaClGdbHook(struct NaClApp const *nap) {
   StopForDebuggerInit(nap->mem_start);
 }