Update from https://crrev.com/315085

sandbox/linux/seccomp-bpf/syscall_iterator_unittest.cc

-// Copyright (c) 2012 The Chromium 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 "sandbox/linux/seccomp-bpf/syscall_iterator.h"
-
-#include <stdint.h>
-
-#include "sandbox/linux/seccomp-bpf/linux_seccomp.h"
-#include "sandbox/linux/tests/unit_tests.h"
-
-namespace sandbox {
-
-namespace {
-
-const SyscallSet kSyscallSets[] = {
-    SyscallSet::All(),
-    SyscallSet::InvalidOnly(),
-};
-
-SANDBOX_TEST(SyscallIterator, Monotonous) {
-  for (const SyscallSet& set : kSyscallSets) {
-    uint32_t prev = 0;
-    bool have_prev = false;
-    for (uint32_t sysnum : set) {
-      if (have_prev) {
-        SANDBOX_ASSERT(sysnum > prev);
-      } else if (set == SyscallSet::All()) {
-        // The iterator should start at 0.
-        SANDBOX_ASSERT(sysnum == 0);
-      }
-
-      prev = sysnum;
-      have_prev = true;
-    }
-
-    // The iterator should always return 0xFFFFFFFFu as the last value.
-    SANDBOX_ASSERT(have_prev);
-    SANDBOX_ASSERT(prev == 0xFFFFFFFFu);
-  }
-}
-
-// AssertRange checks that SyscallIterator produces all system call
-// numbers in the inclusive range [min, max].
-void AssertRange(uint32_t min, uint32_t max) {
-  SANDBOX_ASSERT(min < max);
-  uint32_t prev = min - 1;
-  for (uint32_t sysnum : SyscallSet::All()) {
-    if (sysnum >= min && sysnum <= max) {
-      SANDBOX_ASSERT(prev == sysnum - 1);
-      prev = sysnum;
-    }
-  }
-  SANDBOX_ASSERT(prev == max);
-}
-
-SANDBOX_TEST(SyscallIterator, ValidSyscallRanges) {
-  AssertRange(MIN_SYSCALL, MAX_PUBLIC_SYSCALL);
-#if defined(__arm__)
-  AssertRange(MIN_PRIVATE_SYSCALL, MAX_PRIVATE_SYSCALL);
-  AssertRange(MIN_GHOST_SYSCALL, MAX_SYSCALL);
-#endif
-}
-
-SANDBOX_TEST(SyscallIterator, InvalidSyscalls) {
-  static const uint32_t kExpected[] = {
-#if defined(__mips__)
-    0,
-    MIN_SYSCALL - 1,
-#endif
-    MAX_PUBLIC_SYSCALL + 1,
-#if defined(__arm__)
-    MIN_PRIVATE_SYSCALL - 1,
-    MAX_PRIVATE_SYSCALL + 1,
-    MIN_GHOST_SYSCALL - 1,
-    MAX_SYSCALL + 1,
-#endif
-    0x7FFFFFFFu,
-    0x80000000u,
-    0xFFFFFFFFu,
-  };
-
-  for (const SyscallSet& set : kSyscallSets) {
-    size_t i = 0;
-    for (uint32_t sysnum : set) {
-      if (!SyscallSet::IsValid(sysnum)) {
-        SANDBOX_ASSERT(i < arraysize(kExpected));
-        SANDBOX_ASSERT(kExpected[i] == sysnum);
-        ++i;
-      }
-    }
-    SANDBOX_ASSERT(i == arraysize(kExpected));
-  }
-}
-
-SANDBOX_TEST(SyscallIterator, ValidOnlyIsOnlyValid) {
-  for (uint32_t sysnum : SyscallSet::ValidOnly()) {
-    SANDBOX_ASSERT(SyscallSet::IsValid(sysnum));
-  }
-}
-
-SANDBOX_TEST(SyscallIterator, InvalidOnlyIsOnlyInvalid) {
-  for (uint32_t sysnum : SyscallSet::InvalidOnly()) {
-    SANDBOX_ASSERT(!SyscallSet::IsValid(sysnum));
-  }
-}
-
-SANDBOX_TEST(SyscallIterator, AllIsValidOnlyPlusInvalidOnly) {
-  std::vector<uint32_t> merged;
-  const SyscallSet valid_only = SyscallSet::ValidOnly();
-  const SyscallSet invalid_only = SyscallSet::InvalidOnly();
-  std::merge(valid_only.begin(),
-             valid_only.end(),
-             invalid_only.begin(),
-             invalid_only.end(),
-             std::back_inserter(merged));
-
-  const SyscallSet all = SyscallSet::All();
-  SANDBOX_ASSERT(merged == std::vector<uint32_t>(all.begin(), all.end()));
-}
-
-}  // namespace
-
-}  // namespace sandbox