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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
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