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