Thu, 07 Apr 2011 09:53:20 -0700
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
1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "interpreter/bytecodeInterpreter.hpp"
27 #include "interpreter/interpreter.hpp"
28 #include "interpreter/interpreterGenerator.hpp"
29 #include "interpreter/interpreterRuntime.hpp"
31 #ifdef CC_INTERP
32 # define __ _masm->
34 void CppInterpreter::initialize() {
35 if (_code != NULL) return;
36 AbstractInterpreter::initialize();
38 // generate interpreter
39 { ResourceMark rm;
40 TraceTime timer("Interpreter generation", TraceStartupTime);
41 int code_size = InterpreterCodeSize;
42 NOT_PRODUCT(code_size *= 4;) // debug uses extra interpreter code space
43 _code = new StubQueue(new InterpreterCodeletInterface, code_size, NULL,
44 "Interpreter");
45 InterpreterGenerator g(_code);
46 if (PrintInterpreter) print();
47 }
50 // Allow c++ interpreter to do one initialization now that switches are set, etc.
51 BytecodeInterpreter start_msg(BytecodeInterpreter::initialize);
52 if (JvmtiExport::can_post_interpreter_events())
53 BytecodeInterpreter::runWithChecks(&start_msg);
54 else
55 BytecodeInterpreter::run(&start_msg);
56 }
59 address CppInterpreter::_tosca_to_stack [AbstractInterpreter::number_of_result_handlers];
60 address CppInterpreter::_stack_to_stack [AbstractInterpreter::number_of_result_handlers];
61 address CppInterpreter::_stack_to_native_abi [AbstractInterpreter::number_of_result_handlers];
63 CppInterpreterGenerator::CppInterpreterGenerator(StubQueue* _code): AbstractInterpreterGenerator(_code) {
64 }
66 static const BasicType types[Interpreter::number_of_result_handlers] = {
67 T_BOOLEAN,
68 T_CHAR ,
69 T_BYTE ,
70 T_SHORT ,
71 T_INT ,
72 T_LONG ,
73 T_VOID ,
74 T_FLOAT ,
75 T_DOUBLE ,
76 T_OBJECT
77 };
79 void CppInterpreterGenerator::generate_all() {
80 AbstractInterpreterGenerator::generate_all();
82 { CodeletMark cm(_masm, "result handlers for native calls");
83 // The various result converter stublets.
84 int is_generated[Interpreter::number_of_result_handlers];
85 memset(is_generated, 0, sizeof(is_generated));
86 int _tosca_to_stack_is_generated[Interpreter::number_of_result_handlers];
87 int _stack_to_stack_is_generated[Interpreter::number_of_result_handlers];
88 int _stack_to_native_abi_is_generated[Interpreter::number_of_result_handlers];
90 memset(_tosca_to_stack_is_generated, 0, sizeof(_tosca_to_stack_is_generated));
91 memset(_stack_to_stack_is_generated, 0, sizeof(_stack_to_stack_is_generated));
92 memset(_stack_to_native_abi_is_generated, 0, sizeof(_stack_to_native_abi_is_generated));
93 for (int i = 0; i < Interpreter::number_of_result_handlers; i++) {
94 BasicType type = types[i];
95 if (!is_generated[Interpreter::BasicType_as_index(type)]++) {
96 Interpreter::_native_abi_to_tosca[Interpreter::BasicType_as_index(type)] = generate_result_handler_for(type);
97 }
98 if (!_tosca_to_stack_is_generated[Interpreter::BasicType_as_index(type)]++) {
99 Interpreter::_tosca_to_stack[Interpreter::BasicType_as_index(type)] = generate_tosca_to_stack_converter(type);
100 }
101 if (!_stack_to_stack_is_generated[Interpreter::BasicType_as_index(type)]++) {
102 Interpreter::_stack_to_stack[Interpreter::BasicType_as_index(type)] = generate_stack_to_stack_converter(type);
103 }
104 if (!_stack_to_native_abi_is_generated[Interpreter::BasicType_as_index(type)]++) {
105 Interpreter::_stack_to_native_abi[Interpreter::BasicType_as_index(type)] = generate_stack_to_native_abi_converter(type);
106 }
107 }
108 }
111 #define method_entry(kind) Interpreter::_entry_table[Interpreter::kind] = generate_method_entry(Interpreter::kind)
113 { CodeletMark cm(_masm, "(kind = frame_manager)");
114 // all non-native method kinds
115 method_entry(zerolocals);
116 method_entry(zerolocals_synchronized);
117 method_entry(empty);
118 method_entry(accessor);
119 method_entry(abstract);
120 method_entry(method_handle);
121 method_entry(java_lang_math_sin );
122 method_entry(java_lang_math_cos );
123 method_entry(java_lang_math_tan );
124 method_entry(java_lang_math_abs );
125 method_entry(java_lang_math_sqrt );
126 method_entry(java_lang_math_log );
127 method_entry(java_lang_math_log10 );
128 method_entry(java_lang_ref_reference_get);
129 Interpreter::_native_entry_begin = Interpreter::code()->code_end();
130 method_entry(native);
131 method_entry(native_synchronized);
132 Interpreter::_native_entry_end = Interpreter::code()->code_end();
133 }
136 #undef method_entry
138 }
140 #endif // CC_INTERP