34 #include "utilities/exceptions.hpp"
35 #include "utilities/macros.hpp"
36 #include "runtime/nonJavaThread.hpp"
37 #include "runtime/semaphore.hpp"
38
39 class BootstrapInfo;
40 class ReservedSpace;
41 class VirtualSpace;
42
43 template<class E> class Array;
44 template<class E> class GrowableArray;
45
46 // ArchivePtrMarker is used to mark the location of pointers embedded in a CDS archive. E.g., when an
47 // InstanceKlass k is dumped, we mark the location of the k->_name pointer by effectively calling
48 // mark_pointer(/*ptr_loc=*/&k->_name). It's required that (_prt_base <= ptr_loc < _ptr_end). _ptr_base is
49 // fixed, but _ptr_end can be expanded as more objects are dumped.
50 class ArchivePtrMarker : AllStatic {
51 static CHeapBitMap* _ptrmap;
52 static CHeapBitMap* _rw_ptrmap;
53 static CHeapBitMap* _ro_ptrmap;
54 static VirtualSpace* _vs;
55
56 // Once _ptrmap is compacted, we don't allow bit marking anymore. This is to
57 // avoid unintentional copy operations after the bitmap has been finalized and written.
58 static bool _compacted;
59
60 static address* ptr_base() { return (address*)_vs->low(); } // committed lower bound (inclusive)
61 static address* ptr_end() { return (address*)_vs->high(); } // committed upper bound (exclusive)
62
63 public:
64 static void initialize(CHeapBitMap* ptrmap, VirtualSpace* vs);
65 static void initialize_rw_ro_maps(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap);
66 static void mark_pointer(address* ptr_loc);
67 static void clear_pointer(address* ptr_loc);
68 static void compact(address relocatable_base, address relocatable_end);
69 static void compact(size_t max_non_null_offset);
70
71 template <typename T>
72 static void mark_pointer(T* ptr_loc) {
73 mark_pointer((address*)ptr_loc);
74 }
75
76 template <typename T>
77 static void set_and_mark_pointer(T* ptr_loc, T ptr_value) {
78 *ptr_loc = ptr_value;
79 mark_pointer(ptr_loc);
80 }
81
82 static CHeapBitMap* ptrmap() {
83 return _ptrmap;
84 }
85
86 static CHeapBitMap* rw_ptrmap() {
87 return _rw_ptrmap;
88 }
89
90 static CHeapBitMap* ro_ptrmap() {
91 return _ro_ptrmap;
92 }
93
94 static void reset_map_and_vs() {
95 _ptrmap = nullptr;
96 _rw_ptrmap = nullptr;
97 _ro_ptrmap = nullptr;
98 _vs = nullptr;
99 }
100 };
101
102 // SharedDataRelocator is used to shift pointers in the CDS archive.
103 //
104 // The CDS archive is basically a contiguous block of memory (divided into several regions)
105 // that contains multiple objects. The objects may contain direct pointers that point to other objects
106 // within the archive (e.g., InstanceKlass::_name points to a Symbol in the archive). During dumping, we
107 // built a bitmap that marks the locations of all these pointers (using ArchivePtrMarker, see comments above).
108 //
109 // The contents of the archive assumes that it’s mapped at the default SharedBaseAddress (e.g. 0x800000000).
110 // If the archive ends up being mapped at a different address (e.g. 0x810000000), SharedDataRelocator
111 // is used to shift each marked pointer by a delta (0x10000000 in this example), so that it points to
112 // the actually mapped location of the target object.
113 class SharedDataRelocator: public BitMapClosure {
114 // for all (address** p), where (is_marked(p) && _patch_base <= p && p < _patch_end) { *p += delta; }
115
116 // Patch all pointers within this region that are marked.
117 address* _patch_base;
244 public:
245 ReadClosure(intptr_t** ptr_array, intptr_t base_address) :
246 _ptr_array(ptr_array), _base_address(base_address) {}
247
248 void do_ptr(void** p);
249 void do_u4(u4* p);
250 void do_int(int* p);
251 void do_bool(bool *p);
252 void do_tag(int tag);
253 bool reading() const { return true; }
254 char* region_top() { return nullptr; }
255 };
256
257 class ArchiveUtils {
258 public:
259 static const uintx MAX_SHARED_DELTA = 0x7FFFFFFF;
260 static void log_to_classlist(BootstrapInfo* bootstrap_specifier, TRAPS) NOT_CDS_RETURN;
261 static bool has_aot_initialized_mirror(InstanceKlass* src_ik);
262 template <typename T> static Array<T>* archive_array(GrowableArray<T>* tmp_array);
263
264 // The following functions translate between a u4 offset and an address in the
265 // the range of the mapped CDS archive (e.g., Metaspace::is_in_shared_metaspace()).
266 // Since the first 16 bytes in this range are dummy data (see ArchiveBuilder::reserve_buffer()),
267 // we know that offset 0 never represents a valid object. As a result, an offset of 0
268 // is used to encode a nullptr.
269 //
270 // Use the "archived_address_or_null" variants if a nullptr may be encoded.
271
272 // offset must represent an object of type T in the mapped shared space. Return
273 // a direct pointer to this object.
274 template <typename T> T static offset_to_archived_address(u4 offset) {
275 assert(offset != 0, "sanity");
276 T p = (T)(SharedBaseAddress + offset);
277 assert(Metaspace::is_in_shared_metaspace(p), "must be");
278 return p;
279 }
280
281 template <typename T> T static offset_to_archived_address_or_null(u4 offset) {
282 if (offset == 0) {
283 return nullptr;
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34 #include "utilities/exceptions.hpp"
35 #include "utilities/macros.hpp"
36 #include "runtime/nonJavaThread.hpp"
37 #include "runtime/semaphore.hpp"
38
39 class BootstrapInfo;
40 class ReservedSpace;
41 class VirtualSpace;
42
43 template<class E> class Array;
44 template<class E> class GrowableArray;
45
46 // ArchivePtrMarker is used to mark the location of pointers embedded in a CDS archive. E.g., when an
47 // InstanceKlass k is dumped, we mark the location of the k->_name pointer by effectively calling
48 // mark_pointer(/*ptr_loc=*/&k->_name). It's required that (_prt_base <= ptr_loc < _ptr_end). _ptr_base is
49 // fixed, but _ptr_end can be expanded as more objects are dumped.
50 class ArchivePtrMarker : AllStatic {
51 static CHeapBitMap* _ptrmap;
52 static CHeapBitMap* _rw_ptrmap;
53 static CHeapBitMap* _ro_ptrmap;
54 static CHeapBitMap* _cc_ptrmap;
55 static VirtualSpace* _vs;
56
57 // Once _ptrmap is compacted, we don't allow bit marking anymore. This is to
58 // avoid unintentional copy operations after the bitmap has been finalized and written.
59 static bool _compacted;
60
61 static address* ptr_base() { return (address*)_vs->low(); } // committed lower bound (inclusive)
62 static address* ptr_end() { return (address*)_vs->high(); } // committed upper bound (exclusive)
63
64 public:
65 static void initialize(CHeapBitMap* ptrmap, VirtualSpace* vs);
66 static void initialize_rw_ro_cc_maps(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap, CHeapBitMap* cc_ptrmap);
67 static void mark_pointer(address* ptr_loc);
68 static void clear_pointer(address* ptr_loc);
69 static void compact(address relocatable_base, address relocatable_end);
70 static void compact(size_t max_non_null_offset);
71
72 template <typename T>
73 static void mark_pointer(T* ptr_loc) {
74 mark_pointer((address*)ptr_loc);
75 }
76
77 template <typename T>
78 static void set_and_mark_pointer(T* ptr_loc, T ptr_value) {
79 *ptr_loc = ptr_value;
80 mark_pointer(ptr_loc);
81 }
82
83 static CHeapBitMap* ptrmap() {
84 return _ptrmap;
85 }
86
87 static CHeapBitMap* rw_ptrmap() {
88 return _rw_ptrmap;
89 }
90
91 static CHeapBitMap* ro_ptrmap() {
92 return _ro_ptrmap;
93 }
94
95 static CHeapBitMap* cc_ptrmap() {
96 return _cc_ptrmap;
97 }
98
99 static void reset_map_and_vs() {
100 _ptrmap = nullptr;
101 _rw_ptrmap = nullptr;
102 _ro_ptrmap = nullptr;
103 _cc_ptrmap = nullptr;
104 _vs = nullptr;
105 }
106 };
107
108 // SharedDataRelocator is used to shift pointers in the CDS archive.
109 //
110 // The CDS archive is basically a contiguous block of memory (divided into several regions)
111 // that contains multiple objects. The objects may contain direct pointers that point to other objects
112 // within the archive (e.g., InstanceKlass::_name points to a Symbol in the archive). During dumping, we
113 // built a bitmap that marks the locations of all these pointers (using ArchivePtrMarker, see comments above).
114 //
115 // The contents of the archive assumes that it’s mapped at the default SharedBaseAddress (e.g. 0x800000000).
116 // If the archive ends up being mapped at a different address (e.g. 0x810000000), SharedDataRelocator
117 // is used to shift each marked pointer by a delta (0x10000000 in this example), so that it points to
118 // the actually mapped location of the target object.
119 class SharedDataRelocator: public BitMapClosure {
120 // for all (address** p), where (is_marked(p) && _patch_base <= p && p < _patch_end) { *p += delta; }
121
122 // Patch all pointers within this region that are marked.
123 address* _patch_base;
250 public:
251 ReadClosure(intptr_t** ptr_array, intptr_t base_address) :
252 _ptr_array(ptr_array), _base_address(base_address) {}
253
254 void do_ptr(void** p);
255 void do_u4(u4* p);
256 void do_int(int* p);
257 void do_bool(bool *p);
258 void do_tag(int tag);
259 bool reading() const { return true; }
260 char* region_top() { return nullptr; }
261 };
262
263 class ArchiveUtils {
264 public:
265 static const uintx MAX_SHARED_DELTA = 0x7FFFFFFF;
266 static void log_to_classlist(BootstrapInfo* bootstrap_specifier, TRAPS) NOT_CDS_RETURN;
267 static bool has_aot_initialized_mirror(InstanceKlass* src_ik);
268 template <typename T> static Array<T>* archive_array(GrowableArray<T>* tmp_array);
269
270 static const char* builtin_loader_name_or_null(oop loader); // "boot", "platform", "app", or nullptr
271 static const char* builtin_loader_name(oop loader); // "boot", "platform", or "app". Asserts if not a built-in-loader.
272
273 static bool builtin_loader_from_type(const char* loader_type, oop* value_ret);
274 static oop builtin_loader_from_type(int loader_type);
275
276 // The following functions translate between a u4 offset and an address in the
277 // the range of the mapped CDS archive (e.g., Metaspace::is_in_shared_metaspace()).
278 // Since the first 16 bytes in this range are dummy data (see ArchiveBuilder::reserve_buffer()),
279 // we know that offset 0 never represents a valid object. As a result, an offset of 0
280 // is used to encode a nullptr.
281 //
282 // Use the "archived_address_or_null" variants if a nullptr may be encoded.
283
284 // offset must represent an object of type T in the mapped shared space. Return
285 // a direct pointer to this object.
286 template <typename T> T static offset_to_archived_address(u4 offset) {
287 assert(offset != 0, "sanity");
288 T p = (T)(SharedBaseAddress + offset);
289 assert(Metaspace::is_in_shared_metaspace(p), "must be");
290 return p;
291 }
292
293 template <typename T> T static offset_to_archived_address_or_null(u4 offset) {
294 if (offset == 0) {
295 return nullptr;
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