src/hotspot/share/memory/virtualspace.cpp

*** 532,15 ***
      NOT_AIX(os::vm_allocation_granularity());
  
    const size_t attach_point_alignment = lcm(alignment, os_attach_point_alignment);
  
    char *aligned_heap_base_min_address = (char *)align_up((void *)HeapBaseMinAddress, alignment);
!   size_t noaccess_prefix = ((aligned_heap_base_min_address + size) > (char*)OopEncodingHeapMax) ?
      noaccess_prefix_size(alignment) : 0;
  
    // Attempt to alloc at user-given address.
!   if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
      try_reserve_heap(size + noaccess_prefix, alignment, page_size, aligned_heap_base_min_address);
      if (_base != aligned_heap_base_min_address) { // Enforce this exact address.
        release();
      }
    }
--- 532,15 ---
      NOT_AIX(os::vm_allocation_granularity());
  
    const size_t attach_point_alignment = lcm(alignment, os_attach_point_alignment);
  
    char *aligned_heap_base_min_address = (char *)align_up((void *)HeapBaseMinAddress, alignment);
!   size_t noaccess_prefix = (((aligned_heap_base_min_address + size) > (char*)OopEncodingHeapMax) LP64_ONLY(|| UseCompatibleCompressedOops)) ?
      noaccess_prefix_size(alignment) : 0;
  
    // Attempt to alloc at user-given address.
!   if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) LP64_ONLY(|| UseCompatibleCompressedOops)) {
      try_reserve_heap(size + noaccess_prefix, alignment, page_size, aligned_heap_base_min_address);
      if (_base != aligned_heap_base_min_address) { // Enforce this exact address.
        release();
      }
    }

*** 557,11 ***
      // address. try_reserve_heap() always returns this allocated memory, as only here
      // the criteria for a good heap are checked.
  
      // Attempt to allocate so that we can run without base and scale (32-Bit unscaled compressed oops).
      // Give it several tries from top of range to bottom.
!     if (aligned_heap_base_min_address + size <= (char *)UnscaledOopHeapMax) {
  
        // Calc address range within we try to attach (range of possible start addresses).
        char* const highest_start = align_down((char *)UnscaledOopHeapMax - size, attach_point_alignment);
        char* const lowest_start  = align_up(aligned_heap_base_min_address, attach_point_alignment);
        try_reserve_range(highest_start, lowest_start, attach_point_alignment,
--- 557,11 ---
      // address. try_reserve_heap() always returns this allocated memory, as only here
      // the criteria for a good heap are checked.
  
      // Attempt to allocate so that we can run without base and scale (32-Bit unscaled compressed oops).
      // Give it several tries from top of range to bottom.
!     if (aligned_heap_base_min_address + size <= (char *)UnscaledOopHeapMax LP64_ONLY(&& !UseCompatibleCompressedOops)) {
  
        // Calc address range within we try to attach (range of possible start addresses).
        char* const highest_start = align_down((char *)UnscaledOopHeapMax - size, attach_point_alignment);
        char* const lowest_start  = align_up(aligned_heap_base_min_address, attach_point_alignment);
        try_reserve_range(highest_start, lowest_start, attach_point_alignment,

*** 570,11 ***
  
      // zerobased: Attempt to allocate in the lower 32G.
      char *zerobased_max = (char *)OopEncodingHeapMax;
  
      // Give it several tries from top of range to bottom.
!     if (aligned_heap_base_min_address + size <= zerobased_max &&    // Zerobased theoretical possible.
          ((_base == nullptr) ||                        // No previous try succeeded.
           (_base + size > zerobased_max))) {        // Unscaled delivered an arbitrary address.
  
        // Calc address range within we try to attach (range of possible start addresses).
        char *const highest_start = align_down(zerobased_max - size, attach_point_alignment);
--- 570,12 ---
  
      // zerobased: Attempt to allocate in the lower 32G.
      char *zerobased_max = (char *)OopEncodingHeapMax;
  
      // Give it several tries from top of range to bottom.
!     if (LP64_ONLY(!UseCompatibleCompressedOops &&)
+         aligned_heap_base_min_address + size <= zerobased_max &&    // Zerobased theoretical possible.
          ((_base == nullptr) ||                        // No previous try succeeded.
           (_base + size > zerobased_max))) {        // Unscaled delivered an arbitrary address.
  
        // Calc address range within we try to attach (range of possible start addresses).
        char *const highest_start = align_down(zerobased_max - size, attach_point_alignment);

*** 641,11 ***
    guarantee(is_aligned(size, alignment), "set by caller");
  
    if (UseCompressedOops) {
  #ifdef _LP64
      initialize_compressed_heap(size, alignment, page_size);
!     if (_size > size) {
        // We allocated heap with noaccess prefix.
        // It can happen we get a zerobased/unscaled heap with noaccess prefix,
        // if we had to try at arbitrary address.
        establish_noaccess_prefix();
      }
--- 642,11 ---
    guarantee(is_aligned(size, alignment), "set by caller");
  
    if (UseCompressedOops) {
  #ifdef _LP64
      initialize_compressed_heap(size, alignment, page_size);
!     if (_size > size LP64_ONLY(|| UseCompatibleCompressedOops)) {
        // We allocated heap with noaccess prefix.
        // It can happen we get a zerobased/unscaled heap with noaccess prefix,
        // if we had to try at arbitrary address.
        establish_noaccess_prefix();
      }