Mercurial > hg > truffle
view src/share/vm/classfile/bytecodeAssembler.hpp @ 21863:f4822d122041 jdk8u45-b11
Merge
author | asaha |
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date | Sat, 07 Mar 2015 16:26:10 -0800 |
parents | 4735d2c84362 |
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/* * 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