src/os/linux/vm/os_linux.cpp

rev 7793 : 8073315: Enable gcc -Wtype-limits and fix upcoming issues.
Summary: Relevant fixes in blockOffsetTable.cpp, os_linux.cpp, parCardTableModRefBS.cpp.

*** 3747,3763 ****
  
        // Does this overlap the block we wanted? Give back the overlapped
        // parts and try again.
  
        size_t top_overlap = requested_addr + (bytes + gap) - base[i];
!       if (top_overlap >= 0 && top_overlap < bytes) {
          unmap_memory(base[i], top_overlap);
          base[i] += top_overlap;
          size[i] = bytes - top_overlap;
        } else {
          size_t bottom_overlap = base[i] + bytes - requested_addr;
!         if (bottom_overlap >= 0 && bottom_overlap < bytes) {
            unmap_memory(requested_addr, bottom_overlap);
            size[i] = bytes - bottom_overlap;
          } else {
            size[i] = bytes;
          }
--- 3747,3765 ----
  
        // Does this overlap the block we wanted? Give back the overlapped
        // parts and try again.
  
        size_t top_overlap = requested_addr + (bytes + gap) - base[i];
!       if (requested_addr + (bytes + gap) >= base[i] && // Check underflow.
!           top_overlap < bytes) {
          unmap_memory(base[i], top_overlap);
          base[i] += top_overlap;
          size[i] = bytes - top_overlap;
        } else {
          size_t bottom_overlap = base[i] + bytes - requested_addr;
!         if (base[i] + bytes >= requested_addr && // Check underflow.
!             bottom_overlap < bytes) {
            unmap_memory(requested_addr, bottom_overlap);
            size[i] = bytes - bottom_overlap;
          } else {
            size[i] = bytes;
          }
*** 6021,6031 ****
    if (strlen(core_pattern) == 0) {
      return 0;
    }
  
    char *pid_pos = strstr(core_pattern, "%p");
!   size_t written;
  
    if (core_pattern[0] == '/') {
      written = jio_snprintf(buffer, bufferSize, core_pattern);
    } else {
      char cwd[PATH_MAX];
--- 6023,6033 ----
    if (strlen(core_pattern) == 0) {
      return 0;
    }
  
    char *pid_pos = strstr(core_pattern, "%p");
!   int written;
  
    if (core_pattern[0] == '/') {
      written = jio_snprintf(buffer, bufferSize, core_pattern);
    } else {
      char cwd[PATH_MAX];
*** 6043,6054 ****
      } else {
        written = jio_snprintf(buffer, bufferSize, "%s/%s", p, core_pattern);
      }
    }
  
!   if ((written >= 0) && (written < bufferSize)
!             && (pid_pos == NULL) && (core_pattern[0] != '|')) {
      int core_uses_pid_file = ::open("/proc/sys/kernel/core_uses_pid", O_RDONLY);
  
      if (core_uses_pid_file != -1) {
        char core_uses_pid = 0;
        ssize_t ret = ::read(core_uses_pid_file, &core_uses_pid, 1);
--- 6045,6056 ----
      } else {
        written = jio_snprintf(buffer, bufferSize, "%s/%s", p, core_pattern);
      }
    }
  
!   if ((written >= 0) && ((size_t)written < bufferSize) &&
!       (pid_pos == NULL) && (core_pattern[0] != '|')) {
      int core_uses_pid_file = ::open("/proc/sys/kernel/core_uses_pid", O_RDONLY);
  
      if (core_uses_pid_file != -1) {
        char core_uses_pid = 0;
        ssize_t ret = ::read(core_uses_pid_file, &core_uses_pid, 1);