Delete old x86 validator.

src/trusted/validator/x86/halt_trim.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.
- */
-
-#include "native_client/src/trusted/validator/x86/halt_trim.h"
-
-#include <stdio.h>
-#include "native_client/src/trusted/validator/x86/ncinstbuffer.h"
-
-/* Safety buffer size of halts we must keep, so that we guarantee
- * that we don't trim the last legal instruction in the
- * code segment. Note: we add 1 to the maximum instruction length just
- * to be safe.
- */
-static const NaClMemorySize kMinHaltKeepLength = MAX_INST_LENGTH + 1;
-
-/* x86 HALT opcode */
-static const uint8_t kNaClHalt = 0xf4;
-
-NaClMemorySize NCHaltTrimSize(uint8_t *mbase, NaClMemorySize sz,
-                              uint8_t alignment) {
-  NaClMemorySize i;
-  NaClMemorySize num_halts;
-  for (i = sz - 1; i > 0; --i) {
-    if (kNaClHalt != mbase[i]) break;
-  }
-  num_halts = sz - (i + 1);
-  if (num_halts > kMinHaltKeepLength) {
-    /* May be able to trim off trailing halts. */
-    NaClMemorySize new_size;
-    NaClMemorySize block_overflow;
-    new_size = (sz - num_halts) + kMinHaltKeepLength;
-    /* Round to nearest block alignment. */
-    block_overflow = new_size % alignment;
-    if (block_overflow) {
-      new_size = new_size - block_overflow + alignment;
-    }
-    /* Never increase the segment size. */
-    if (new_size < sz) {
-      return new_size;
-    }
-  }
-  /* No trim performed. */
-  return sz;
-}