jvmciJavaClasses.cpp revision 9149:a8a8604f890f 
12116Sjkh/*
22116Sjkh * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
32116Sjkh * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
42116Sjkh *
52116Sjkh * This code is free software; you can redistribute it and/or modify it
62116Sjkh * under the terms of the GNU General Public License version 2 only, as
72116Sjkh * published by the Free Software Foundation.
82116Sjkh *
92116Sjkh * This code is distributed in the hope that it will be useful, but WITHOUT
102116Sjkh * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
112116Sjkh * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
122116Sjkh * version 2 for more details (a copy is included in the LICENSE file that
132116Sjkh * accompanied this code).
142116Sjkh *
152116Sjkh * You should have received a copy of the GNU General Public License version
162116Sjkh * 2 along with this work; if not, write to the Free Software Foundation,
172116Sjkh * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
182116Sjkh *
192116Sjkh * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
202116Sjkh * or visit www.oracle.com if you need additional information or have any
212116Sjkh * questions.
222116Sjkh */
232116Sjkh
242116Sjkh#include "precompiled.hpp"
252116Sjkh#include "jvmci/jvmciJavaClasses.hpp"
262116Sjkh#include "runtime/jniHandles.hpp"
272116Sjkh#include "classfile/symbolTable.hpp"
282116Sjkh#include "memory/resourceArea.hpp"
292116Sjkh
302116Sjkh// This function is similar to javaClasses.cpp, it computes the field offset of a (static or instance) field.
312116Sjkh// It looks up the name and signature symbols without creating new ones, all the symbols of these classes need to be already loaded.
322116Sjkh
332116Sjkhvoid compute_offset(int &dest_offset, Klass* klass, const char* name, const char* signature, bool static_field) {
342116Sjkh  InstanceKlass* ik = InstanceKlass::cast(klass);
352116Sjkh  Symbol* name_symbol = SymbolTable::probe(name, (int)strlen(name));
362116Sjkh  Symbol* signature_symbol = SymbolTable::probe(signature, (int)strlen(signature));
372116Sjkh  if (name_symbol == NULL || signature_symbol == NULL) {
382116Sjkh#ifndef PRODUCT
392116Sjkh    ik->print_on(tty);
402116Sjkh#endif
412116Sjkh    fatal("symbol with name %s and signature %s was not found in symbol table (klass=%s)", name, signature, klass->name()->as_C_string());
422116Sjkh  }
432116Sjkh
442116Sjkh  fieldDescriptor fd;
452116Sjkh  if (!ik->find_field(name_symbol, signature_symbol, &fd)) {
462116Sjkh    ResourceMark rm;
472116Sjkh    fatal("Invalid layout of %s at %s", name_symbol->as_C_string(), ik->external_name());
482116Sjkh  }
492116Sjkh  guarantee(fd.is_static() == static_field, "static/instance mismatch");
502116Sjkh  dest_offset = fd.offset();
512116Sjkh  assert(dest_offset != 0, "must be valid offset");
522116Sjkh}
532116Sjkh
54// This piece of macro magic creates the contents of the jvmci_compute_offsets method that initializes the field indices of all the access classes.
55
56#define START_CLASS(name) { Klass* k = SystemDictionary::name##_klass(); assert(k != NULL, "Could not find class " #name "");
57
58#define END_CLASS }
59
60#define FIELD(klass, name, signature, static_field) compute_offset(klass::_##name##_offset, k, #name, signature, static_field);
61#define CHAR_FIELD(klass, name) FIELD(klass, name, "C", false)
62#define INT_FIELD(klass, name) FIELD(klass, name, "I", false)
63#define BOOLEAN_FIELD(klass, name) FIELD(klass, name, "Z", false)
64#define LONG_FIELD(klass, name) FIELD(klass, name, "J", false)
65#define FLOAT_FIELD(klass, name) FIELD(klass, name, "F", false)
66#define OOP_FIELD(klass, name, signature) FIELD(klass, name, signature, false)
67#define STATIC_OOP_FIELD(klass, name, signature) FIELD(klass, name, signature, true)
68#define STATIC_INT_FIELD(klass, name) FIELD(klass, name, "I", true)
69#define STATIC_BOOLEAN_FIELD(klass, name) FIELD(klass, name, "Z", true)
70
71
72void JVMCIJavaClasses::compute_offsets() {
73  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)
74  guarantee(InstalledCode::_address_offset == sizeof(oopDesc), "codeBlob must be first field!");
75}
76
77#define EMPTY0
78#define EMPTY1(x)
79#define EMPTY2(x,y)
80#define FIELD2(klass, name) int klass::_##name##_offset = 0;
81#define FIELD3(klass, name, sig) FIELD2(klass, name)
82
83COMPILER_CLASSES_DO(EMPTY1, EMPTY0, FIELD2, FIELD2, FIELD2, FIELD2, FIELD2, FIELD3, FIELD3, FIELD3, FIELD3, FIELD3, FIELD2, FIELD2)
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