src/hotspot/share/runtime/arguments.cpp

@@ -1916,11 +1916,11 @@
      jio_fprintf(defaultStream::error_stream(),
                  "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture");
      return false;
    }
  #endif
- #if (defined(X86) || defined(PPC64)) && !defined(ZERO)
+ #if defined(X86) && !defined(ZERO)
    if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
      jio_fprintf(defaultStream::error_stream(),
                  "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive");
  
      return false;

@@ -3083,10 +3083,32 @@
  
  #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
    UNSUPPORTED_OPTION(ShowRegistersOnAssert);
  #endif // CAN_SHOW_REGISTERS_ON_ASSERT
  
+ #ifdef _LP64
+   if (UseCompactObjectHeaders && UseZGC && !ZGenerational) {
+     if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
+       warning("Single-generational ZGC does not work with compact object headers, disabling UseCompactObjectHeaders");
+     }
+     FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
+   }
+   if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
+     warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
+     FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
+   }
+   if (UseCompactObjectHeaders && LockingMode == LM_LEGACY) {
+     FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
+   }
+   if (UseCompactObjectHeaders && !UseAltGCForwarding) {
+     FLAG_SET_DEFAULT(UseAltGCForwarding, true);
+   }
+   if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
+     FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
+   }
+ #endif
+ 
    return JNI_OK;
  }
  
  // Helper class for controlling the lifetime of JavaVMInitArgs
  // objects.  The contents of the JavaVMInitArgs are guaranteed to be

@@ -3373,17 +3395,24 @@
    if (_default_shared_archive_path == nullptr) {
      char jvm_path[JVM_MAXPATHLEN];
      os::jvm_path(jvm_path, sizeof(jvm_path));
      char *end = strrchr(jvm_path, *os::file_separator());
      if (end != nullptr) *end = '\0';
-     size_t jvm_path_len = strlen(jvm_path);
-     size_t file_sep_len = strlen(os::file_separator());
-     const size_t len = jvm_path_len + file_sep_len + 20;
-     _default_shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
-     jio_snprintf(_default_shared_archive_path, len,
-                 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
-                 jvm_path, os::file_separator());
+     stringStream tmp;
+     tmp.print("%s%sclasses", jvm_path, os::file_separator());
+ #ifdef _LP64
+     if (!UseCompressedOops) {
+       tmp.print_raw("_nocoops");
+     }
+     if (UseCompactObjectHeaders) {
+       // Note that generation of xxx_coh.jsa variants require
+       // --enable-cds-archive-coh at build time
+       tmp.print_raw("_coh");
+     }
+ #endif
+     tmp.print_raw(".jsa");
+     _default_shared_archive_path = os::strdup(tmp.base());
    }
    return _default_shared_archive_path;
  }
  
  int Arguments::num_archives(const char* archive_path) {