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) { 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 } 53 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 72 void 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 83 COMPILER_CLASSES_DO(EMPTY1, EMPTY0, FIELD2, FIELD2, FIELD2, FIELD2, FIELD2, FIELD3, FIELD3, FIELD3, FIELD3, FIELD3, FIELD2, FIELD2) 84 85 86 87 88