1 /*
2 * Copyright (c) 2011, 2015, 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 "jvmci/jvmciJavaClasses.hpp"
26 #include "runtime/jniHandles.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "memory/resourceArea.hpp"
29
30 // This function is similar to javaClasses.cpp, it computes the field offset of a (static or instance) field.
31 // It looks up the name and signature symbols without creating new ones, all the symbols of these classes need to be already loaded.
32
33 void compute_offset(int &dest_offset, Klass* klass, const char* name, const char* signature, bool static_field, TRAPS) {
34 InstanceKlass* ik = InstanceKlass::cast(klass);
35 Symbol* name_symbol = SymbolTable::probe(name, (int)strlen(name));
36 Symbol* signature_symbol = SymbolTable::probe(signature, (int)strlen(signature));
37 if (name_symbol == NULL || signature_symbol == NULL) {
38 #ifndef PRODUCT
39 ik->print_on(tty);
40 #endif
41 fatal("symbol with name %s and signature %s was not found in symbol table (klass=%s)", name, signature, klass->name()->as_C_string());
42 }
43
44 fieldDescriptor fd;
45 if (!ik->find_field(name_symbol, signature_symbol, &fd)) {
46 ResourceMark rm;
47 fatal("Invalid layout of %s at %s", name_symbol->as_C_string(), ik->external_name());
48 }
49 guarantee(fd.is_static() == static_field, "static/instance mismatch");
50 dest_offset = fd.offset();
51 assert(dest_offset != 0, "must be valid offset");
52 if (static_field) {
53 // Must ensure classes for static fields are initialized as the
54 // accessor itself does not include a class initialization check.
55 ik->initialize(CHECK);
56 }
57 }
58
59 // This piece of macro magic creates the contents of the jvmci_compute_offsets method that initializes the field indices of all the access classes.
60
61 #define START_CLASS(name) { Klass* k = SystemDictionary::name##_klass(); assert(k != NULL, "Could not find class " #name "");
62
63 #define END_CLASS }
64
65 #define FIELD(klass, name, signature, static_field) compute_offset(klass::_##name##_offset, k, #name, signature, static_field, CHECK);
66 #define CHAR_FIELD(klass, name) FIELD(klass, name, "C", false)
67 #define INT_FIELD(klass, name) FIELD(klass, name, "I", false)
68 #define BOOLEAN_FIELD(klass, name) FIELD(klass, name, "Z", false)
69 #define LONG_FIELD(klass, name) FIELD(klass, name, "J", false)
70 #define FLOAT_FIELD(klass, name) FIELD(klass, name, "F", false)
71 #define OOP_FIELD(klass, name, signature) FIELD(klass, name, signature, false)
72 #define STATIC_OOP_FIELD(klass, name, signature) FIELD(klass, name, signature, true)
73 #define STATIC_INT_FIELD(klass, name) FIELD(klass, name, "I", true)
74 #define STATIC_BOOLEAN_FIELD(klass, name) FIELD(klass, name, "Z", true)
75
76
77 void JVMCIJavaClasses::compute_offsets(TRAPS) {
78 COMPILER_CLASSES_DO(START_CLASS, END_CLASS, CHAR_FIELD, INT_FIELD, BOOLEAN_FIELD, LONG_FIELD, FLOAT_FIELD, OOP_FIELD, OOP_FIELD, OOP_FIELD, STATIC_OOP_FIELD, STATIC_OOP_FIELD, STATIC_INT_FIELD, STATIC_BOOLEAN_FIELD)
79 }
80
81 #define EMPTY0
82 #define EMPTY1(x)
83 #define EMPTY2(x,y)
84 #define FIELD2(klass, name) int klass::_##name##_offset = 0;
85 #define FIELD3(klass, name, sig) FIELD2(klass, name)
86
87 COMPILER_CLASSES_DO(EMPTY1, EMPTY0, FIELD2, FIELD2, FIELD2, FIELD2, FIELD2, FIELD3, FIELD3, FIELD3, FIELD3, FIELD3, FIELD2, FIELD2)
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