Mercurial > hg > truffle
diff src/share/vm/classfile/bytecodeAssembler.hpp @ 6934:4735d2c84362
7200776: Implement default methods in interfaces
Summary: Add generic type analysis and default method selection algorithms
Reviewed-by: coleenp, acorn
author | kamg |
---|---|
date | Thu, 11 Oct 2012 12:25:42 -0400 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/classfile/bytecodeAssembler.hpp Thu Oct 11 12:25:42 2012 -0400 @@ -0,0 +1,214 @@ +/* + * Copyright (c) 2012, 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 InstanceKlass::cast(_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