Fix "unsafe narrowing" warnings in absl, 9/n.

Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare

(This specific CL focuses on miscellaneous non-test source files.)

Bug: chromium:1292951
PiperOrigin-RevId: 473054605
Change-Id: Ifd7b24966613ca915511a3a607095508068200b8

absl/container/inlined_vector.h

@@ -626,9 +626,9 @@ class InlinedVector {
     ABSL_HARDENING_ASSERT(pos <= end());
 
     if (ABSL_PREDICT_TRUE(first != last)) {
-      return storage_.Insert(pos,
-                             IteratorValueAdapter<A, ForwardIterator>(first),
-                             std::distance(first, last));
+      return storage_.Insert(
+          pos, IteratorValueAdapter<A, ForwardIterator>(first),
+          static_cast<size_type>(std::distance(first, last)));
     } else {
       return const_cast<iterator>(pos);
     }
@@ -645,7 +645,7 @@ class InlinedVector {
     ABSL_HARDENING_ASSERT(pos >= begin());
     ABSL_HARDENING_ASSERT(pos <= end());
 
-    size_type index = std::distance(cbegin(), pos);
+    size_type index = static_cast<size_type>(std::distance(cbegin(), pos));
     for (size_type i = index; first != last; ++i, static_cast<void>(++first)) {
       insert(data() + i, *first);
     }

absl/debugging/failure_signal_handler.cc

@@ -135,7 +135,7 @@ static bool SetupAlternateStackOnce() {
 #if defined(__wasm__) || defined (__asjms__)
   const size_t page_mask = getpagesize() - 1;
 #else
-  const size_t page_mask = sysconf(_SC_PAGESIZE) - 1;
+  const size_t page_mask = static_cast<size_t>(sysconf(_SC_PAGESIZE)) - 1;
 #endif
   size_t stack_size =
       (std::max<size_t>(SIGSTKSZ, 65536) + page_mask) & ~page_mask;
@@ -356,7 +356,7 @@ static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) {
   if (fsh_options.alarm_on_failure_secs > 0) {
     alarm(0);  // Cancel any existing alarms.
     signal(SIGALRM, ImmediateAbortSignalHandler);
-    alarm(fsh_options.alarm_on_failure_secs);
+    alarm(static_cast<unsigned int>(fsh_options.alarm_on_failure_secs));
   }
 #endif
 

absl/debugging/symbolize_darwin.inc

@@ -83,13 +83,14 @@ bool Symbolize(const void* pc, char* out, int out_size) {
       memmove(out, tmp_buf, len + 1);
     }
   } else {
-    strncpy(out, symbol.c_str(), out_size);
+    strncpy(out, symbol.c_str(), static_cast<size_t>(out_size));
   }
 
   if (out[out_size - 1] != '\0') {
     // strncpy() does not '\0' terminate when it truncates.
     static constexpr char kEllipsis[] = "...";
-    int ellipsis_size = std::min<int>(sizeof(kEllipsis) - 1, out_size - 1);
+    size_t ellipsis_size =
+        std::min(sizeof(kEllipsis) - 1, static_cast<size_t>(out_size) - 1);
     memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
     out[out_size - 1] = '\0';
   }

absl/flags/parse.cc

@@ -159,14 +159,14 @@ class ArgsList {
   // Returns success status: true if parsing successful, false otherwise.
   bool ReadFromFlagfile(const std::string& flag_file_name);
 
-  int Size() const { return args_.size() - next_arg_; }
-  int FrontIndex() const { return next_arg_; }
+  size_t Size() const { return args_.size() - next_arg_; }
+  size_t FrontIndex() const { return next_arg_; }
   absl::string_view Front() const { return args_[next_arg_]; }
   void PopFront() { next_arg_++; }
 
  private:
   std::vector<std::string> args_;
-  int next_arg_;
+  size_t next_arg_;
 };
 
 bool ArgsList::ReadFromFlagfile(const std::string& flag_file_name) {
@@ -626,7 +626,7 @@ std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
 
   std::vector<char*> output_args;
   std::vector<char*> positional_args;
-  output_args.reserve(argc);
+  output_args.reserve(static_cast<size_t>(argc));
 
   // This is the list of undefined flags. The element of the list is the pair
   // consisting of boolean indicating if flag came from command line (vs from
@@ -795,8 +795,8 @@ std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
 
   // All the remaining arguments are positional.
   if (!input_args.empty()) {
-    for (int arg_index = input_args.back().FrontIndex(); arg_index < argc;
-         ++arg_index) {
+    for (size_t arg_index = input_args.back().FrontIndex();
+         arg_index < static_cast<size_t>(argc); ++arg_index) {
       output_args.push_back(argv[arg_index]);
     }
   }

absl/synchronization/mutex.cc

@@ -1801,8 +1801,8 @@ static inline bool EvalConditionAnnotated(const Condition *cond, Mutex *mu,
   // operation tsan considers that we've already released the mutex.
   bool res = false;
 #ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
-  const int flags = read_lock ? __tsan_mutex_read_lock : 0;
-  const int tryflags = flags | (trylock ? __tsan_mutex_try_lock : 0);
+  const uint32_t flags = read_lock ? __tsan_mutex_read_lock : 0;
+  const uint32_t tryflags = flags | (trylock ? __tsan_mutex_try_lock : 0);
 #endif
   if (locking) {
     // For lock we pretend that we have finished the operation,

absl/time/duration.cc

@@ -617,7 +617,7 @@ timespec ToTimespec(Duration d) {
         rep_lo -= kTicksPerSecond;
       }
     }
-    ts.tv_sec = rep_hi;
+    ts.tv_sec = static_cast<decltype(ts.tv_sec)>(rep_hi);
     if (ts.tv_sec == rep_hi) {  // no time_t narrowing
       ts.tv_nsec = rep_lo / kTicksPerNanosecond;
       return ts;
@@ -691,7 +691,7 @@ namespace {
 char* Format64(char* ep, int width, int64_t v) {
   do {
     --width;
-    *--ep = '0' + (v % 10);  // contiguous digits
+    *--ep = static_cast<char>('0' + (v % 10));  // contiguous digits
   } while (v /= 10);
   while (--width >= 0) *--ep = '0';  // zero pad
   return ep;

absl/time/time.cc

@@ -297,7 +297,7 @@ timespec ToTimespec(Time t) {
   timespec ts;
   absl::Duration d = time_internal::ToUnixDuration(t);
   if (!time_internal::IsInfiniteDuration(d)) {
-    ts.tv_sec = time_internal::GetRepHi(d);
+    ts.tv_sec = static_cast<decltype(ts.tv_sec)>(time_internal::GetRepHi(d));
     if (ts.tv_sec == time_internal::GetRepHi(d)) {  // no time_t narrowing
       ts.tv_nsec = time_internal::GetRepLo(d) / 4;  // floor
       return ts;