1 /*
2 * Copyright (c) 2020, 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
24 #include "precompiled.hpp"
25 #include "classfile/symbolTable.hpp"
26 #include "memory/resourceArea.hpp"
27 #include "runtime/interfaceSupport.inline.hpp"
28 #include "runtime/signature.hpp"
29 #include "threadHelper.inline.hpp"
30 #include "unittest.hpp"
31
TEST_VM(SignatureStream,check_refcount)32 TEST_VM(SignatureStream, check_refcount) {
33
34 JavaThread* THREAD = JavaThread::current();
35 // the thread should be in vm to use locks
36 ThreadInVMfromNative ThreadInVMfromNative(THREAD);
37 // SignatureStream::as_symbol will allocate on the resource area
38 ResourceMark rm(THREAD);
39
40 Symbol* foo = SymbolTable::new_symbol("Foo");
41 int r1 = foo->refcount();
42
43 {
44 // Trivial test: non-method signature of a non-permanent symbol
45 Symbol* methodSig = SymbolTable::new_symbol("LFoo;");
46 SignatureStream ss(methodSig, false);
47 Symbol* sym = ss.as_symbol();
48 ASSERT_EQ(sym, foo) << "found symbol should be Foo: " << sym->as_C_string();
49 // This should mean the SS looks up and increments refcount to Foo
50 ASSERT_EQ(foo->refcount(), r1 + 1) << "refcount should be incremented";
51
52 ASSERT_TRUE(!ss.is_done())
53 << "stream parsing should not be marked as done until"
54 <<" ss.next() called after the last symbol";
55
56 ss.next();
57 ASSERT_TRUE(ss.is_done()) << "stream parsing should be marked as done";
58 }
59
60 ASSERT_EQ(foo->refcount(), r1) << "refcount should have decremented";
61
62 {
63 // Ensure refcount is properly decremented when first symbol is non-permanent and second isn't
64
65 Symbol* integer = SymbolTable::new_symbol("java/lang/Integer");
66 ASSERT_TRUE(integer->is_permanent()) << "java/lang/Integer must be permanent";
67
68 Symbol* methodSig = SymbolTable::new_symbol("(LFoo;)Ljava/lang/Integer;");
69 SignatureStream ss(methodSig);
70 Symbol* sym = ss.as_symbol();
71 ASSERT_EQ(sym, foo) << "found symbol should be Foo: " << sym->as_C_string();
72 // This should mean the SS looks up and increments refcount to Foo
73 ASSERT_EQ(foo->refcount(), r1 + 1) << "refcount should be incremented";
74
75 ss.next();
76 sym = ss.as_symbol();
77 ASSERT_EQ(sym, integer) << "found symbol should be java/lang/Integer";
78
79 ASSERT_TRUE(!ss.is_done())
80 << "stream parsing should not be marked as done until"
81 <<" ss.next() called after the last symbol";
82
83 ss.next();
84 ASSERT_TRUE(ss.is_done()) << "stream parsing should be marked as done";
85 }
86
87 ASSERT_EQ(foo->refcount(), r1) << "refcount should have decremented";
88
89 }
90