Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiClassFileReconstituter.hpp @ 3249:e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
| author | johnc |
|---|---|
| date | Thu, 07 Apr 2011 09:53:20 -0700 |
| parents | 3582bf76420e |
| children | 1d1603768966 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP |
| 26 #define SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP | |
| 27 | |
| 28 #include "jvmtifiles/jvmtiEnv.hpp" | |
| 29 | |
| 0 | 30 |
| 31 class JvmtiConstantPoolReconstituter : public StackObj { | |
| 32 private: | |
| 33 int _cpool_size; | |
| 34 SymbolHashMap* _symmap; | |
| 35 SymbolHashMap* _classmap; | |
| 36 constantPoolHandle _cpool; | |
| 37 instanceKlassHandle _ikh; | |
| 38 jvmtiError _err; | |
| 39 | |
| 40 protected: | |
| 41 instanceKlassHandle ikh() { return _ikh; }; | |
| 42 constantPoolHandle cpool() { return _cpool; }; | |
| 43 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1972
diff
changeset
|
44 u2 symbol_to_cpool_index(Symbol* sym) { |
| 0 | 45 return _symmap->symbol_to_value(sym); |
| 46 } | |
| 47 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1972
diff
changeset
|
48 u2 class_symbol_to_cpool_index(Symbol* sym) { |
| 0 | 49 return _classmap->symbol_to_value(sym); |
| 50 } | |
| 51 | |
| 52 public: | |
| 53 // Calls to this constructor must be proceeded by a ResourceMark | |
| 54 // and a HandleMark | |
| 55 JvmtiConstantPoolReconstituter(instanceKlassHandle ikh){ | |
| 56 set_error(JVMTI_ERROR_NONE); | |
| 57 _ikh = ikh; | |
| 58 _cpool = constantPoolHandle(Thread::current(), ikh->constants()); | |
| 59 _symmap = new SymbolHashMap(); | |
| 60 _classmap = new SymbolHashMap(); | |
| 61 _cpool_size = _cpool->hash_entries_to(_symmap, _classmap); | |
| 62 if (_cpool_size == 0) { | |
| 63 set_error(JVMTI_ERROR_OUT_OF_MEMORY); | |
| 64 } else if (_cpool_size < 0) { | |
| 65 set_error(JVMTI_ERROR_INTERNAL); | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 ~JvmtiConstantPoolReconstituter() { | |
| 70 if (_symmap != NULL) { | |
| 71 os::free(_symmap); | |
| 72 _symmap = NULL; | |
| 73 } | |
| 74 if (_classmap != NULL) { | |
| 75 os::free(_classmap); | |
| 76 _classmap = NULL; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 | |
| 81 void set_error(jvmtiError err) { _err = err; } | |
| 82 jvmtiError get_error() { return _err; } | |
| 83 | |
| 84 int cpool_size() { return _cpool_size; } | |
| 85 | |
| 86 void copy_cpool_bytes(unsigned char *cpool_bytes) { | |
| 87 if (cpool_bytes == NULL) { | |
| 88 assert(cpool_bytes != NULL, "cpool_bytes pointer must not be NULL"); | |
| 89 return; | |
| 90 } | |
| 91 cpool()->copy_cpool_bytes(cpool_size(), _symmap, cpool_bytes); | |
| 92 } | |
| 93 }; | |
| 94 | |
| 95 | |
| 96 class JvmtiClassFileReconstituter : public JvmtiConstantPoolReconstituter { | |
| 97 private: | |
| 98 size_t _buffer_size; | |
| 99 u1* _buffer; | |
| 100 u1* _buffer_ptr; | |
| 101 Thread* _thread; | |
| 102 | |
| 103 enum { | |
| 104 // initial size should be power of two | |
| 105 initial_buffer_size = 1024 | |
| 106 }; | |
| 107 | |
| 108 inline Thread* thread() { return _thread; } | |
| 109 | |
| 110 void write_class_file_format(); | |
| 111 void write_field_infos(); | |
| 112 void write_method_infos(); | |
| 113 void write_method_info(methodHandle method); | |
| 114 void write_code_attribute(methodHandle method); | |
| 115 void write_exceptions_attribute(constMethodHandle const_method); | |
| 116 void write_synthetic_attribute(); | |
| 117 void write_class_attributes(); | |
| 118 void write_source_file_attribute(); | |
| 119 void write_source_debug_extension_attribute(); | |
| 120 u2 line_number_table_entries(methodHandle method); | |
| 121 void write_line_number_table_attribute(methodHandle method, u2 num_entries); | |
| 122 void write_stackmap_table_attribute(methodHandle method, int stackmap_table_len); | |
| 123 u2 inner_classes_attribute_length(); | |
| 124 void write_inner_classes_attribute(int length); | |
| 125 void write_signature_attribute(u2 generic_signaure_index); | |
| 126 void write_attribute_name_index(const char* name); | |
| 127 void write_annotations_attribute(const char* attr_name, typeArrayHandle annos); | |
| 128 | |
| 129 address writeable_address(size_t size); | |
| 130 void write_u1(u1 x); | |
| 131 void write_u2(u2 x); | |
| 132 void write_u4(u4 x); | |
| 133 void write_u8(u8 x); | |
| 134 | |
| 135 public: | |
| 136 // Calls to this constructor must be proceeded by a ResourceMark | |
| 137 // and a HandleMark | |
| 138 JvmtiClassFileReconstituter(instanceKlassHandle ikh) : | |
| 139 JvmtiConstantPoolReconstituter(ikh) { | |
| 140 _buffer_size = initial_buffer_size; | |
| 141 _buffer = _buffer_ptr = NEW_RESOURCE_ARRAY(u1, _buffer_size); | |
| 142 _thread = Thread::current(); | |
| 143 write_class_file_format(); | |
| 144 }; | |
| 145 | |
| 146 size_t class_file_size() { return _buffer_ptr - _buffer; } | |
| 147 | |
| 148 u1* class_file_bytes() { return _buffer; } | |
| 149 | |
| 150 static void copy_bytecodes(methodHandle method, unsigned char* bytecodes); | |
| 151 }; | |
| 1972 | 152 |
| 153 #endif // SHARE_VM_PRIMS_JVMTICLASSFILERECONSTITUTER_HPP |