| /* |
| * Copyright (c) 2012, 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_CLASSFILE_BYTECODEASSEMBLER_HPP |
| #define SHARE_VM_CLASSFILE_BYTECODEASSEMBLER_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "oops/method.hpp" |
| #include "oops/symbol.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "utilities/growableArray.hpp" |
| #include "utilities/resourceHash.hpp" |
| |
| |
| /** |
| * Bytecode Assembler |
| * |
| * These classes are used to synthesize code for creating new methods from |
| * within the VM. This is only a partial implementation of an assembler; |
| * only the bytecodes that are needed by clients are implemented at this time. |
| * This is used during default method analysis to create overpass methods |
| * and add them to a call during parsing. Other uses (such as creating |
| * bridges) may come later. Any missing bytecodes can be implemented on an |
| * as-need basis. |
| */ |
| |
| class BytecodeBuffer : public GrowableArray<u1> { |
| public: |
| BytecodeBuffer() : GrowableArray<u1>(20) {} |
| }; |
| |
| // Entries in a yet-to-be-created constant pool. Limited types for now. |
| class BytecodeCPEntry VALUE_OBJ_CLASS_SPEC { |
| public: |
| enum tag { |
| ERROR_TAG, |
| UTF8, |
| KLASS, |
| STRING, |
| NAME_AND_TYPE, |
| METHODREF |
| }; |
| |
| u1 _tag; |
| union { |
| Symbol* utf8; |
| u2 klass; |
| u2 string; |
| struct { |
| u2 name_index; |
| u2 type_index; |
| } name_and_type; |
| struct { |
| u2 class_index; |
| u2 name_and_type_index; |
| } methodref; |
| uintptr_t hash; |
| } _u; |
| |
| BytecodeCPEntry() : _tag(ERROR_TAG) { _u.hash = 0; } |
| BytecodeCPEntry(u1 tag) : _tag(tag) { _u.hash = 0; } |
| |
| static BytecodeCPEntry utf8(Symbol* symbol) { |
| BytecodeCPEntry bcpe(UTF8); |
| bcpe._u.utf8 = symbol; |
| return bcpe; |
| } |
| |
| static BytecodeCPEntry klass(u2 index) { |
| BytecodeCPEntry bcpe(KLASS); |
| bcpe._u.klass = index; |
| return bcpe; |
| } |
| |
| static BytecodeCPEntry string(u2 index) { |
| BytecodeCPEntry bcpe(STRING); |
| bcpe._u.string = index; |
| return bcpe; |
| } |
| |
| static BytecodeCPEntry name_and_type(u2 name, u2 type) { |
| BytecodeCPEntry bcpe(NAME_AND_TYPE); |
| bcpe._u.name_and_type.name_index = name; |
| bcpe._u.name_and_type.type_index = type; |
| return bcpe; |
| } |
| |
| static BytecodeCPEntry methodref(u2 class_index, u2 nat) { |
| BytecodeCPEntry bcpe(METHODREF); |
| bcpe._u.methodref.class_index = class_index; |
| bcpe._u.methodref.name_and_type_index = nat; |
| return bcpe; |
| } |
| |
| static bool equals(BytecodeCPEntry const& e0, BytecodeCPEntry const& e1) { |
| return e0._tag == e1._tag && e0._u.hash == e1._u.hash; |
| } |
| |
| static unsigned hash(BytecodeCPEntry const& e0) { |
| return (unsigned)(e0._tag ^ e0._u.hash); |
| } |
| }; |
| |
| class BytecodeConstantPool : ResourceObj { |
| private: |
| typedef ResourceHashtable<BytecodeCPEntry, u2, |
| &BytecodeCPEntry::hash, &BytecodeCPEntry::equals> IndexHash; |
| |
| ConstantPool* _orig; |
| GrowableArray<BytecodeCPEntry> _entries; |
| IndexHash _indices; |
| |
| u2 find_or_add(BytecodeCPEntry const& bcpe); |
| |
| public: |
| |
| BytecodeConstantPool(ConstantPool* orig) : _orig(orig) {} |
| |
| BytecodeCPEntry const& at(u2 index) const { return _entries.at(index); } |
| |
| InstanceKlass* pool_holder() const { |
| return _orig->pool_holder(); |
| } |
| |
| u2 utf8(Symbol* sym) { |
| return find_or_add(BytecodeCPEntry::utf8(sym)); |
| } |
| |
| u2 klass(Symbol* class_name) { |
| return find_or_add(BytecodeCPEntry::klass(utf8(class_name))); |
| } |
| |
| u2 string(Symbol* str) { |
| return find_or_add(BytecodeCPEntry::string(utf8(str))); |
| } |
| |
| u2 name_and_type(Symbol* name, Symbol* sig) { |
| return find_or_add(BytecodeCPEntry::name_and_type(utf8(name), utf8(sig))); |
| } |
| |
| u2 methodref(Symbol* class_name, Symbol* name, Symbol* sig) { |
| return find_or_add(BytecodeCPEntry::methodref( |
| klass(class_name), name_and_type(name, sig))); |
| } |
| |
| ConstantPool* create_constant_pool(TRAPS) const; |
| }; |
| |
| // Partial bytecode assembler - only what we need for creating |
| // overpass methods for default methods is implemented |
| class BytecodeAssembler : StackObj { |
| private: |
| BytecodeBuffer* _code; |
| BytecodeConstantPool* _cp; |
| |
| void append(u1 imm_u1); |
| void append(u2 imm_u2); |
| void append(u4 imm_u4); |
| |
| void xload(u4 index, u1 quick, u1 twobyte); |
| |
| public: |
| BytecodeAssembler(BytecodeBuffer* buffer, BytecodeConstantPool* cp) |
| : _code(buffer), _cp(cp) {} |
| |
| void aload(u4 index); |
| void areturn(); |
| void athrow(); |
| void checkcast(Symbol* sym); |
| void dload(u4 index); |
| void dreturn(); |
| void dup(); |
| void fload(u4 index); |
| void freturn(); |
| void iload(u4 index); |
| void invokespecial(Method* method); |
| void invokespecial(Symbol* cls, Symbol* name, Symbol* sig); |
| void invokevirtual(Method* method); |
| void invokevirtual(Symbol* cls, Symbol* name, Symbol* sig); |
| void ireturn(); |
| void ldc(u1 index); |
| void ldc_w(u2 index); |
| void lload(u4 index); |
| void lreturn(); |
| void _new(Symbol* sym); |
| void _return(); |
| |
| void load_string(Symbol* sym); |
| void load(BasicType bt, u4 index); |
| void _return(BasicType bt); |
| }; |
| |
| #endif // SHARE_VM_CLASSFILE_BYTECODEASSEMBLER_HPP |