1 /*
2 * Copyright (c) 2012, 2017, 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
25 #ifndef SHARE_VM_PRIMS_WHITEBOX_HPP
26 #define SHARE_VM_PRIMS_WHITEBOX_HPP
27
28 #include "jni.h"
29
30 #include "utilities/exceptions.hpp"
31 #include "memory/allocation.hpp"
32 #include "oops/oopsHierarchy.hpp"
33 #include "oops/symbol.hpp"
34 #include "runtime/interfaceSupport.hpp"
35
36 // Unconditionally clear pedantic pending JNI checks
37 class ClearPendingJniExcCheck : public StackObj {
38 private:
39 JavaThread* _thread;
40 public:
41 ClearPendingJniExcCheck(JNIEnv* env) : _thread(JavaThread::thread_from_jni_environment(env)) {}
42 ~ClearPendingJniExcCheck() {
43 _thread->clear_pending_jni_exception_check();
44 }
45 };
46
47 // Entry macro to transition from JNI to VM state.
48
49 #define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header) \
50 ClearPendingJniExcCheck _clearCheck(env);
51
52 #define WB_END JNI_END
53 #define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
54
55 #define CHECK_JNI_EXCEPTION_(env, value) \
56 do { \
57 JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
58 if (HAS_PENDING_EXCEPTION) { \
59 return(value); \
60 } \
61 } while (0)
62
63 #define CHECK_JNI_EXCEPTION(env) \
64 do { \
65 JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
66 if (HAS_PENDING_EXCEPTION) { \
67 return; \
68 } \
69 } while (0)
70
71 class CodeBlob;
72 class CodeHeap;
73 class JavaThread;
74
75 class WhiteBox : public AllStatic {
76 private:
77 static bool _used;
78 public:
79 static volatile bool compilation_locked;
80 static bool used() { return _used; }
81 static void set_used() { _used = true; }
82 static int offset_for_field(const char* field_name, oop object,
83 Symbol* signature_symbol);
84 static const char* lookup_jstring(const char* field_name, oop object);
85 static bool lookup_bool(const char* field_name, oop object);
86 static int get_blob_type(const CodeBlob* code);
87 static CodeHeap* get_code_heap(int blob_type);
88 static CodeBlob* allocate_code_blob(int size, int blob_type);
89 static int array_bytes_to_length(size_t bytes);
90 static void register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread,
91 JNINativeMethod* method_array, int method_count);
92 static void register_extended(JNIEnv* env, jclass wbclass, JavaThread* thread);
93 static bool compile_method(Method* method, int comp_level, int bci, Thread* THREAD);
94 };
95
96
97
98 #endif // SHARE_VM_PRIMS_WHITEBOX_HPP