/*

 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include "precompiled.hpp"

#include "jvmci/jvmciJavaClasses.hpp"

#include "runtime/jniHandles.hpp"

#include "classfile/symbolTable.hpp"

#include "memory/resourceArea.hpp"

// This function is similar to javaClasses.cpp, it computes the field offset of a (static or instance) field.

// It looks up the name and signature symbols without creating new ones, all the symbols of these classes need to be already loaded.

void compute_offset(int &dest_offset, Klass* klass, const char* name, const char* signature, bool static_field) {

  InstanceKlass* ik = InstanceKlass::cast(klass);

  Symbol* name_symbol = SymbolTable::probe(name, (int)strlen(name));

  Symbol* signature_symbol = SymbolTable::probe(signature, (int)strlen(signature));

  if (name_symbol == NULL || signature_symbol == NULL) {

#ifndef PRODUCT

    ik->print_on(tty);

#endif

    fatal(err_msg("symbol with name %s and signature %s was not found in symbol table (klass=%s)", name, signature, klass->name()->as_C_string()));

  }

  fieldDescriptor fd;

  if (!ik->find_field(name_symbol, signature_symbol, &fd)) {

    ResourceMark rm;

    fatal(err_msg("Invalid layout of %s at %s", name_symbol->as_C_string(), ik->external_name()));

  }

  guarantee(fd.is_static() == static_field, "static/instance mismatch");

  dest_offset = fd.offset();

  assert(dest_offset != 0, "must be valid offset");

}

// This piece of macro magic creates the contents of the jvmci_compute_offsets method that initializes the field indices of all the access classes.

#define START_CLASS(name) { Klass* k = SystemDictionary::name##_klass(); assert(k != NULL, "Could not find class " #name "");

#define END_CLASS }

#define FIELD(klass, name, signature, static_field) compute_offset(klass::_##name##_offset, k, #name, signature, static_field);

#define CHAR_FIELD(klass, name) FIELD(klass, name, "C", false)

#define INT_FIELD(klass, name) FIELD(klass, name, "I", false)

#define BOOLEAN_FIELD(klass, name) FIELD(klass, name, "Z", false)

#define LONG_FIELD(klass, name) FIELD(klass, name, "J", false)

#define FLOAT_FIELD(klass, name) FIELD(klass, name, "F", false)

#define OOP_FIELD(klass, name, signature) FIELD(klass, name, signature, false)

#define STATIC_OOP_FIELD(klass, name, signature) FIELD(klass, name, signature, true)

#define STATIC_INT_FIELD(klass, name) FIELD(klass, name, "I", true)

#define STATIC_BOOLEAN_FIELD(klass, name) FIELD(klass, name, "Z", true)

void JVMCIJavaClasses::compute_offsets() {

  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)

  guarantee(InstalledCode::_address_offset == sizeof(oopDesc), "codeBlob must be first field!");

}

#define EMPTY0

#define EMPTY1(x)

#define EMPTY2(x,y)

#define FIELD2(klass, name) int klass::_##name##_offset = 0;

#define FIELD3(klass, name, sig) FIELD2(klass, name)

COMPILER_CLASSES_DO(EMPTY1, EMPTY0, FIELD2, FIELD2, FIELD2, FIELD2, FIELD2, FIELD3, FIELD3, FIELD3, FIELD3, FIELD3, FIELD2, FIELD2)