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提交 d359f8ec 编写于 作者: T twisti
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6894206: JVM needs a way to traverse method handle structures 

Summary: We need a way to walk chained method handles in the JVM to call the right methods and to generate required bytecode adapters for the compilers.
Reviewed-by: kvn
上级 72621aa4
隐藏空白更改
内联 并排
Showing with 1241 addition and 58 deletion
src/cpu/x86/vm/methodHandles_x86.cpp
浏览文件 @ d359f8ec
......@@ -268,8 +268,9 @@ void MethodHandles::remove_arg_slots(MacroAssembler* _masm,
}
#ifndef PRODUCT
extern "C" void print_method_handle(oop mh);
void trace_method_handle_stub(const char* adaptername,
oopDesc* mh,
oop mh,
intptr_t* entry_sp,
intptr_t* saved_sp,
intptr_t* saved_bp) {
......@@ -280,6 +281,7 @@ void trace_method_handle_stub(const char* adaptername,
adaptername, (intptr_t)mh, (intptr_t)entry_sp, (intptr_t)(saved_sp - entry_sp), (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
if (last_sp != saved_sp)
printf("*** last_sp="INTPTR_FORMAT"\n", (intptr_t)last_sp);
if (Verbose) print_method_handle(mh);
}
#endif //PRODUCT
......
src/share/vm/classfile/javaClasses.cpp
浏览文件 @ d359f8ec
......@@ -2403,6 +2403,10 @@ oop java_dyn_MethodType::ptype(oop mt, int idx) {
return ptypes(mt)->obj_at(idx);
}
int java_dyn_MethodType::ptype_count(oop mt) {
return ptypes(mt)->length();
}
// Support for java_dyn_MethodTypeForm
......
src/share/vm/classfile/javaClasses.hpp
浏览文件 @ d359f8ec
......@@ -1027,6 +1027,7 @@ class java_dyn_MethodType: AllStatic {
static oop form(oop mt);
static oop ptype(oop mt, int index);
static int ptype_count(oop mt);
static symbolOop as_signature(oop mt, bool intern_if_not_found, TRAPS);
static void print_signature(oop mt, outputStream* st);
......
src/share/vm/classfile/vmSymbols.cpp
浏览文件 @ d359f8ec
/*
* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 1997-2009 Sun Microsystems, Inc. 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
......@@ -70,6 +70,7 @@ static const char* vm_symbol_bodies = VM_SYMBOLS_DO(VM_SYMBOL_BODY, VM_ALIAS_IGN
void vmSymbols::initialize(TRAPS) {
assert((int)SID_LIMIT <= (1<<log2_SID_LIMIT), "must fit in this bitfield");
assert((int)SID_LIMIT*5 > (1<<log2_SID_LIMIT), "make the bitfield smaller, please");
assert(vmIntrinsics::FLAG_LIMIT <= (1 << vmIntrinsics::log2_FLAG_LIMIT), "must fit in this bitfield");
if (!UseSharedSpaces) {
const char* string = &vm_symbol_bodies[0];
......@@ -271,6 +272,44 @@ vmSymbols::SID vmSymbols::find_sid(symbolOop symbol) {
return sid;
}
static vmIntrinsics::ID wrapper_intrinsic(BasicType type, bool unboxing) {
#define TYPE2(type, unboxing) ((int)(type)*2 + ((unboxing) ? 1 : 0))
switch (TYPE2(type, unboxing)) {
#define BASIC_TYPE_CASE(type, box, unbox) \
case TYPE2(type, false): return vmIntrinsics::box; \
case TYPE2(type, true): return vmIntrinsics::unbox
BASIC_TYPE_CASE(T_BOOLEAN, _Boolean_valueOf, _booleanValue);
BASIC_TYPE_CASE(T_BYTE, _Byte_valueOf, _byteValue);
BASIC_TYPE_CASE(T_CHAR, _Character_valueOf, _charValue);
BASIC_TYPE_CASE(T_SHORT, _Short_valueOf, _shortValue);
BASIC_TYPE_CASE(T_INT, _Integer_valueOf, _intValue);
BASIC_TYPE_CASE(T_LONG, _Long_valueOf, _longValue);
BASIC_TYPE_CASE(T_FLOAT, _Float_valueOf, _floatValue);
BASIC_TYPE_CASE(T_DOUBLE, _Double_valueOf, _doubleValue);
#undef BASIC_TYPE_CASE
}
#undef TYPE2
return vmIntrinsics::_none;
}
vmIntrinsics::ID vmIntrinsics::for_boxing(BasicType type) {
return wrapper_intrinsic(type, false);
}
vmIntrinsics::ID vmIntrinsics::for_unboxing(BasicType type) {
return wrapper_intrinsic(type, true);
}
methodOop vmIntrinsics::method_for(vmIntrinsics::ID id) {
if (id == _none) return NULL;
symbolOop cname = vmSymbols::symbol_at(class_for(id));
symbolOop mname = vmSymbols::symbol_at(name_for(id));
symbolOop msig = vmSymbols::symbol_at(signature_for(id));
if (cname == NULL || mname == NULL || msig == NULL) return NULL;
klassOop k = SystemDictionary::find_well_known_klass(cname);
if (k == NULL) return NULL;
return instanceKlass::cast(k)->find_method(mname, msig);
}
#define VM_INTRINSIC_INITIALIZE(id, klass, name, sig, flags) #id "\0"
static const char* vm_intrinsic_name_bodies =
......@@ -330,15 +369,15 @@ inline bool match_F_RNY(jshort flags) {
}
// These are for forming case labels:
#define ID3(x, y, z) (( jint)(z) + \
((jint)(y) << vmSymbols::log2_SID_LIMIT) + \
((jint)(x) << (2*vmSymbols::log2_SID_LIMIT)) )
#define ID3(x, y, z) (( jlong)(z) + \
((jlong)(y) << vmSymbols::log2_SID_LIMIT) + \
((jlong)(x) << (2*vmSymbols::log2_SID_LIMIT)) )
#define SID_ENUM(n) vmSymbols::VM_SYMBOL_ENUM_NAME(n)
vmIntrinsics::ID vmIntrinsics::find_id(vmSymbols::SID holder,
vmSymbols::SID name,
vmSymbols::SID sig,
jshort flags) {
vmIntrinsics::ID vmIntrinsics::find_id_impl(vmSymbols::SID holder,
vmSymbols::SID name,
vmSymbols::SID sig,
jshort flags) {
assert((int)vmSymbols::SID_LIMIT <= (1<<vmSymbols::log2_SID_LIMIT), "must fit");
// Let the C compiler build the decision tree.
......@@ -383,62 +422,50 @@ const char* vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID id, char* buf,
}
// These are for friendly printouts of intrinsics:
// These are to get information about intrinsics.
vmSymbols::SID vmIntrinsics::class_for(vmIntrinsics::ID id) {
#ifndef PRODUCT
#define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
case id: return SID_ENUM(klass);
#define ID4(x, y, z, f) ((ID3(x, y, z) << vmIntrinsics::log2_FLAG_LIMIT) | (jlong) (f))
switch (id) {
VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
}
#undef VM_INTRINSIC_CASE
#endif //PRODUCT
return vmSymbols::NO_SID;
static const jlong intrinsic_info_array[vmIntrinsics::ID_LIMIT+1] = {
#define VM_INTRINSIC_INFO(ignore_id, klass, name, sig, fcode) \
ID4(SID_ENUM(klass), SID_ENUM(name), SID_ENUM(sig), vmIntrinsics::fcode),
0, VM_INTRINSICS_DO(VM_INTRINSIC_INFO,
VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE)
0
#undef VM_INTRINSIC_INFO
};
inline jlong intrinsic_info(vmIntrinsics::ID id) {
return intrinsic_info_array[vmIntrinsics::ID_from((int)id)];
}
vmSymbols::SID vmIntrinsics::name_for(vmIntrinsics::ID id) {
#ifndef PRODUCT
#define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
case id: return SID_ENUM(name);
vmSymbols::SID vmIntrinsics::class_for(vmIntrinsics::ID id) {
jlong info = intrinsic_info(id);
int shift = 2*vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1021, "");
return vmSymbols::SID( (info >> shift) & mask );
}
switch (id) {
VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
}
#undef VM_INTRINSIC_CASE
#endif //PRODUCT
return vmSymbols::NO_SID;
vmSymbols::SID vmIntrinsics::name_for(vmIntrinsics::ID id) {
jlong info = intrinsic_info(id);
int shift = vmSymbols::log2_SID_LIMIT + log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1022, "");
return vmSymbols::SID( (info >> shift) & mask );
}
vmSymbols::SID vmIntrinsics::signature_for(vmIntrinsics::ID id) {
#ifndef PRODUCT
#define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
case id: return SID_ENUM(sig);
switch (id) {
VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
}
#undef VM_INTRINSIC_CASE
#endif //PRODUCT
return vmSymbols::NO_SID;
jlong info = intrinsic_info(id);
int shift = log2_FLAG_LIMIT, mask = right_n_bits(vmSymbols::log2_SID_LIMIT);
assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 1023, "");
return vmSymbols::SID( (info >> shift) & mask );
}
vmIntrinsics::Flags vmIntrinsics::flags_for(vmIntrinsics::ID id) {
#ifndef PRODUCT
#define VM_INTRINSIC_CASE(id, klass, name, sig, fcode) \
case id: return fcode;
switch (id) {
VM_INTRINSICS_DO(VM_INTRINSIC_CASE,
VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_SYMBOL_IGNORE, VM_ALIAS_IGNORE);
}
#undef VM_INTRINSIC_CASE
#endif //PRODUCT
return F_none;
jlong info = intrinsic_info(id);
int shift = 0, mask = right_n_bits(log2_FLAG_LIMIT);
assert(((ID4(1021,1022,1023,15) >> shift) & mask) == 15, "");
return Flags( (info >> shift) & mask );
}
......
src/share/vm/classfile/vmSymbols.hpp
浏览文件 @ d359f8ec
......@@ -346,9 +346,14 @@
\
/* common signatures names */ \
template(void_method_signature, "()V") \
template(void_boolean_signature, "()Z") \
template(void_byte_signature, "()B") \
template(void_char_signature, "()C") \
template(void_short_signature, "()S") \
template(void_int_signature, "()I") \
template(void_long_signature, "()J") \
template(void_boolean_signature, "()Z") \
template(void_float_signature, "()F") \
template(void_double_signature, "()D") \
template(int_void_signature, "(I)V") \
template(int_int_signature, "(I)I") \
template(int_bool_signature, "(I)Z") \
......@@ -853,6 +858,46 @@
\
do_intrinsic(_invoke, java_lang_reflect_Method, invoke_name, object_array_object_object_signature, F_R) \
/* (symbols invoke_name and invoke_signature defined above) */ \
do_intrinsic(_checkSpreadArgument, sun_dyn_MethodHandleImpl, checkSpreadArgument_name, checkSpreadArgument_signature, F_S) \
do_name( checkSpreadArgument_name, "checkSpreadArgument") \
do_name( checkSpreadArgument_signature, "(Ljava/lang/Object;I)V") \
\
/* unboxing methods: */ \
do_intrinsic(_booleanValue, java_lang_Boolean, booleanValue_name, void_boolean_signature, F_R) \
do_name( booleanValue_name, "booleanValue") \
do_intrinsic(_byteValue, java_lang_Byte, byteValue_name, void_byte_signature, F_R) \
do_name( byteValue_name, "byteValue") \
do_intrinsic(_charValue, java_lang_Character, charValue_name, void_char_signature, F_R) \
do_name( charValue_name, "charValue") \
do_intrinsic(_shortValue, java_lang_Short, shortValue_name, void_short_signature, F_R) \
do_name( shortValue_name, "shortValue") \
do_intrinsic(_intValue, java_lang_Integer, intValue_name, void_int_signature, F_R) \
do_name( intValue_name, "intValue") \
do_intrinsic(_longValue, java_lang_Long, longValue_name, void_long_signature, F_R) \
do_name( longValue_name, "longValue") \
do_intrinsic(_floatValue, java_lang_Float, floatValue_name, void_float_signature, F_R) \
do_name( floatValue_name, "floatValue") \
do_intrinsic(_doubleValue, java_lang_Double, doubleValue_name, void_double_signature, F_R) \
do_name( doubleValue_name, "doubleValue") \
\
/* boxing methods: */ \
do_name( valueOf_name, "valueOf") \
do_intrinsic(_Boolean_valueOf, java_lang_Boolean, valueOf_name, Boolean_valueOf_signature, F_S) \
do_name( Boolean_valueOf_signature, "(Z)Ljava/lang/Boolean;") \
do_intrinsic(_Byte_valueOf, java_lang_Byte, valueOf_name, Byte_valueOf_signature, F_S) \
do_name( Byte_valueOf_signature, "(B)Ljava/lang/Byte;") \
do_intrinsic(_Character_valueOf, java_lang_Character, valueOf_name, Character_valueOf_signature, F_S) \
do_name( Character_valueOf_signature, "(C)Ljava/lang/Character;") \
do_intrinsic(_Short_valueOf, java_lang_Short, valueOf_name, Short_valueOf_signature, F_S) \
do_name( Short_valueOf_signature, "(S)Ljava/lang/Short;") \
do_intrinsic(_Integer_valueOf, java_lang_Integer, valueOf_name, Integer_valueOf_signature, F_S) \
do_name( Integer_valueOf_signature, "(I)Ljava/lang/Integer;") \
do_intrinsic(_Long_valueOf, java_lang_Long, valueOf_name, Long_valueOf_signature, F_S) \
do_name( Long_valueOf_signature, "(J)Ljava/lang/Long;") \
do_intrinsic(_Float_valueOf, java_lang_Float, valueOf_name, Float_valueOf_signature, F_S) \
do_name( Float_valueOf_signature, "(F)Ljava/lang/Float;") \
do_intrinsic(_Double_valueOf, java_lang_Double, valueOf_name, Double_valueOf_signature, F_S) \
do_name( Double_valueOf_signature, "(D)Ljava/lang/Double;") \
\
/*end*/
......@@ -983,7 +1028,12 @@ class vmIntrinsics: AllStatic {
F_Y, // !static ?native synchronized
F_RN, // !static native !synchronized
F_SN, // static native !synchronized
F_RNY // !static native synchronized
F_RNY, // !static native synchronized
FLAG_LIMIT
};
enum {
log2_FLAG_LIMIT = 4 // checked by an assert at start-up
};
public:
......@@ -995,15 +1045,32 @@ public:
static const char* name_at(ID id);
private:
static ID find_id_impl(vmSymbols::SID holder,
vmSymbols::SID name,
vmSymbols::SID sig,
jshort flags);
public:
// Given a method's class, name, signature, and access flags, report its ID.
static ID find_id(vmSymbols::SID holder,
vmSymbols::SID name,
vmSymbols::SID sig,
jshort flags);
jshort flags) {
ID id = find_id_impl(holder, name, sig, flags);
#ifdef ASSERT
// ID _none does not hold the following asserts.
if (id == _none) return id;
#endif
assert( class_for(id) == holder, "correct id");
assert( name_for(id) == name, "correct id");
assert(signature_for(id) == sig, "correct id");
return id;
}
static void verify_method(ID actual_id, methodOop m) PRODUCT_RETURN;
// No need for these in the product:
// Find out the symbols behind an intrinsic:
static vmSymbols::SID class_for(ID id);
static vmSymbols::SID name_for(ID id);
static vmSymbols::SID signature_for(ID id);
......@@ -1013,4 +1080,8 @@ public:
// Access to intrinsic methods:
static methodOop method_for(ID id);
// Wrapper object methods:
static ID for_boxing(BasicType type);
static ID for_unboxing(BasicType type);
};
src/share/vm/includeDB_core
浏览文件 @ d359f8ec
......@@ -2814,6 +2814,10 @@ methodDataOop.hpp oop.hpp
methodDataOop.hpp orderAccess.hpp
methodDataOop.hpp universe.hpp
methodHandleWalk.hpp methodHandles.hpp
methodHandleWalk.cpp methodHandleWalk.hpp
methodHandles.hpp frame.inline.hpp
methodHandles.hpp globals.hpp
methodHandles.hpp interfaceSupport.hpp
......
src/share/vm/prims/methodHandleWalk.cpp 0 → 100644
浏览文件 @ d359f8ec
/*
* Copyright 2008-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
/*
* JSR 292 reference implementation: method handle structure analysis
*/
#include "incls/_precompiled.incl"
#include "incls/_methodHandleWalk.cpp.incl"
void MethodHandleChain::set_method_handle(Handle mh, TRAPS) {
if (!java_dyn_MethodHandle::is_instance(mh())) lose("bad method handle", CHECK);
// set current method handle and unpack partially
_method_handle = mh;
_is_last = false;
_is_bound = false;
_arg_slot = -1;
_arg_type = T_VOID;
_conversion = -1;
_last_invoke = Bytecodes::_nop; //arbitrary non-garbage
if (sun_dyn_DirectMethodHandle::is_instance(mh())) {
set_last_method(mh(), THREAD);
return;
}
if (sun_dyn_AdapterMethodHandle::is_instance(mh())) {
_conversion = AdapterMethodHandle_conversion();
assert(_conversion != -1, "bad conv value");
assert(sun_dyn_BoundMethodHandle::is_instance(mh()), "also BMH");
}
if (sun_dyn_BoundMethodHandle::is_instance(mh())) {
if (!is_adapter()) // keep AMH and BMH separate in this model
_is_bound = true;
_arg_slot = BoundMethodHandle_vmargslot();
oop target = MethodHandle_vmtarget_oop();
if (!is_bound() || java_dyn_MethodHandle::is_instance(target)) {
_arg_type = compute_bound_arg_type(target, NULL, _arg_slot, CHECK);
} else if (target != NULL && target->is_method()) {
_arg_type = compute_bound_arg_type(NULL, (methodOop)target, _arg_slot, CHECK);
set_last_method(mh(), CHECK);
} else {
_is_bound = false; // lose!
}
}
if (is_bound() && _arg_type == T_VOID) {
lose("bad vmargslot", CHECK);
}
if (!is_bound() && !is_adapter()) {
lose("unrecognized MH type", CHECK);
}
}
void MethodHandleChain::set_last_method(oop target, TRAPS) {
_is_last = true;
klassOop receiver_limit_oop = NULL;
int flags = 0;
methodOop m = MethodHandles::decode_method(target, receiver_limit_oop, flags);
_last_method = methodHandle(THREAD, m);
if ((flags & MethodHandles::_dmf_has_receiver) == 0)
_last_invoke = Bytecodes::_invokestatic;
else if ((flags & MethodHandles::_dmf_does_dispatch) == 0)
_last_invoke = Bytecodes::_invokespecial;
else if ((flags & MethodHandles::_dmf_from_interface) != 0)
_last_invoke = Bytecodes::_invokeinterface;
else
_last_invoke = Bytecodes::_invokevirtual;
}
BasicType MethodHandleChain::compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS) {
// There is no direct indication of whether the argument is primitive or not.
// It is implied by the _vmentry code, and by the MethodType of the target.
// FIXME: Make it explicit MethodHandleImpl refactors out from MethodHandle
BasicType arg_type = T_VOID;
if (target != NULL) {
oop mtype = java_dyn_MethodHandle::type(target);
int arg_num = MethodHandles::argument_slot_to_argnum(mtype, arg_slot);
if (arg_num >= 0) {
oop ptype = java_dyn_MethodType::ptype(mtype, arg_num);
arg_type = java_lang_Class::as_BasicType(ptype);
}
} else if (m != NULL) {
// figure out the argument type from the slot
// FIXME: make this explicit in the MH
int cur_slot = m->size_of_parameters();
if (arg_slot >= cur_slot)
return T_VOID;
if (!m->is_static()) {
cur_slot -= type2size[T_OBJECT];
if (cur_slot == arg_slot)
return T_OBJECT;
}
for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
BasicType bt = ss.type();
cur_slot -= type2size[bt];
if (cur_slot <= arg_slot) {
if (cur_slot == arg_slot)
arg_type = bt;
break;
}
}
}
if (arg_type == T_ARRAY)
arg_type = T_OBJECT;
return arg_type;
}
void MethodHandleChain::lose(const char* msg, TRAPS) {
_lose_message = msg;
if (!THREAD->is_Java_thread() || ((JavaThread*)THREAD)->thread_state() != _thread_in_vm) {
// throw a preallocated exception
THROW_OOP(Universe::virtual_machine_error_instance());
}
THROW_MSG(vmSymbols::java_lang_InternalError(), msg);
}
Bytecodes::Code MethodHandleWalker::conversion_code(BasicType src, BasicType dest) {
if (is_subword_type(src)) {
src = T_INT; // all subword src types act like int
}
if (src == dest) {
return Bytecodes::_nop;
}
#define SRC_DEST(s,d) (((int)(s) << 4) + (int)(d))
switch (SRC_DEST(src, dest)) {
case SRC_DEST(T_INT, T_LONG): return Bytecodes::_i2l;
case SRC_DEST(T_INT, T_FLOAT): return Bytecodes::_i2f;
case SRC_DEST(T_INT, T_DOUBLE): return Bytecodes::_i2d;
case SRC_DEST(T_INT, T_BYTE): return Bytecodes::_i2b;
case SRC_DEST(T_INT, T_CHAR): return Bytecodes::_i2c;
case SRC_DEST(T_INT, T_SHORT): return Bytecodes::_i2s;
case SRC_DEST(T_LONG, T_INT): return Bytecodes::_l2i;
case SRC_DEST(T_LONG, T_FLOAT): return Bytecodes::_l2f;
case SRC_DEST(T_LONG, T_DOUBLE): return Bytecodes::_l2d;
case SRC_DEST(T_FLOAT, T_INT): return Bytecodes::_f2i;
case SRC_DEST(T_FLOAT, T_LONG): return Bytecodes::_f2l;
case SRC_DEST(T_FLOAT, T_DOUBLE): return Bytecodes::_f2d;
case SRC_DEST(T_DOUBLE, T_INT): return Bytecodes::_d2i;
case SRC_DEST(T_DOUBLE, T_LONG): return Bytecodes::_d2l;
case SRC_DEST(T_DOUBLE, T_FLOAT): return Bytecodes::_d2f;
}
#undef SRC_DEST
// cannot do it in one step, or at all
return Bytecodes::_illegal;
}
MethodHandleWalker::ArgToken
MethodHandleWalker::walk(TRAPS) {
walk_incoming_state(CHECK_NULL);
for (;;) {
set_method_handle(chain().method_handle_oop());
assert(_outgoing_argc == argument_count_slow(), "empty slots under control");
if (chain().is_adapter()) {
int conv_op = chain().adapter_conversion_op();
int arg_slot = chain().adapter_arg_slot();
SlotState* arg_state = slot_state(arg_slot);
if (arg_state == NULL
&& conv_op > sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW) {
lose("bad argument index", CHECK_NULL);
}
// perform the adapter action
switch (chain().adapter_conversion_op()) {
case sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY:
case sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW:
// No changes to arguments; pass the bits through.
// The only difference between the two ops is that the "only" version
// is fully compatible with the verifier, while the "raw" version
// performs a few extra bitwise conversions (like long <-> double).
break;
case sun_dyn_AdapterMethodHandle::OP_CHECK_CAST: {
// checkcast the Nth outgoing argument in place
klassOop dest_klass = NULL;
BasicType dest = java_lang_Class::as_BasicType(chain().adapter_arg_oop(), &dest_klass);
assert(dest == T_OBJECT, "");
assert(dest == arg_state->_type, "");
arg_state->_arg = make_conversion(T_OBJECT, dest_klass, Bytecodes::_checkcast, arg_state->_arg, CHECK_NULL);
debug_only(dest_klass = (klassOop)badOop);
break;
}
case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM: {
// i2l, etc., on the Nth outgoing argument in place
BasicType src = chain().adapter_conversion_src_type(),
dest = chain().adapter_conversion_dest_type();
Bytecodes::Code bc = conversion_code(src, dest);
ArgToken arg = arg_state->_arg;
if (bc == Bytecodes::_nop) {
break;
} else if (bc != Bytecodes::_illegal) {
arg = make_conversion(dest, NULL, bc, arg, CHECK_NULL);
} else if (is_subword_type(dest)) {
bc = conversion_code(src, T_INT);
if (bc != Bytecodes::_illegal) {
arg = make_conversion(dest, NULL, bc, arg, CHECK_NULL);
bc = conversion_code(T_INT, dest);
arg = make_conversion(dest, NULL, bc, arg, CHECK_NULL);
}
}
if (bc == Bytecodes::_illegal) {
lose("bad primitive conversion", CHECK_NULL);
}
change_argument(src, arg_slot, dest, arg);
break;
}
case sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM: {
// checkcast to wrapper type & call intValue, etc.
BasicType dest = chain().adapter_conversion_dest_type();
ArgToken arg = arg_state->_arg;
arg = make_conversion(T_OBJECT, SystemDictionary::box_klass(dest),
Bytecodes::_checkcast, arg, CHECK_NULL);
vmIntrinsics::ID unboxer = vmIntrinsics::for_unboxing(dest);
if (unboxer == vmIntrinsics::_none) {
lose("no unboxing method", CHECK_NULL);
}
ArgToken arglist[2];
arglist[0] = arg; // outgoing 'this'
arglist[1] = NULL; // sentinel
arg = make_invoke(NULL, unboxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_NULL);
change_argument(T_OBJECT, arg_slot, dest, arg);
break;
}
case sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF: {
// call wrapper type.valueOf
BasicType src = chain().adapter_conversion_src_type();
ArgToken arg = arg_state->_arg;
vmIntrinsics::ID boxer = vmIntrinsics::for_boxing(src);
if (boxer == vmIntrinsics::_none) {
lose("no boxing method", CHECK_NULL);
}
ArgToken arglist[2];
arglist[0] = arg; // outgoing value
arglist[1] = NULL; // sentinel
arg = make_invoke(NULL, boxer, Bytecodes::_invokevirtual, false, 1, &arglist[0], CHECK_NULL);
change_argument(src, arg_slot, T_OBJECT, arg);
break;
}
case sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS: {
int dest_arg_slot = chain().adapter_conversion_vminfo();
if (!slot_has_argument(dest_arg_slot)) {
lose("bad swap index", CHECK_NULL);
}
// a simple swap between two arguments
SlotState* dest_arg_state = slot_state(dest_arg_slot);
SlotState temp = (*dest_arg_state);
(*dest_arg_state) = (*arg_state);
(*arg_state) = temp;
break;
}
case sun_dyn_AdapterMethodHandle::OP_ROT_ARGS: {
int dest_arg_slot = chain().adapter_conversion_vminfo();
if (!slot_has_argument(dest_arg_slot) || arg_slot == dest_arg_slot) {
lose("bad rotate index", CHECK_NULL);
}
SlotState* dest_arg_state = slot_state(dest_arg_slot);
// Rotate the source argument (plus following N slots) into the
// position occupied by the dest argument (plus following N slots).
int rotate_count = type2size[dest_arg_state->_type];
// (no other rotate counts are currently supported)
if (arg_slot < dest_arg_slot) {
for (int i = 0; i < rotate_count; i++) {
SlotState temp = _outgoing.at(arg_slot);
_outgoing.remove_at(arg_slot);
_outgoing.insert_before(dest_arg_slot + rotate_count - 1, temp);
}
} else { // arg_slot > dest_arg_slot
for (int i = 0; i < rotate_count; i++) {
SlotState temp = _outgoing.at(arg_slot + rotate_count - 1);
_outgoing.remove_at(arg_slot + rotate_count - 1);
_outgoing.insert_before(dest_arg_slot, temp);
}
}
break;
}
case sun_dyn_AdapterMethodHandle::OP_DUP_ARGS: {
int dup_slots = chain().adapter_conversion_stack_pushes();
if (dup_slots <= 0) {
lose("bad dup count", CHECK_NULL);
}
for (int i = 0; i < dup_slots; i++) {
SlotState* dup = slot_state(arg_slot + 2*i);
if (dup == NULL) break; // safety net
if (dup->_type != T_VOID) _outgoing_argc += 1;
_outgoing.insert_before(i, (*dup));
}
break;
}
case sun_dyn_AdapterMethodHandle::OP_DROP_ARGS: {
int drop_slots = -chain().adapter_conversion_stack_pushes();
if (drop_slots <= 0) {
lose("bad drop count", CHECK_NULL);
}
for (int i = 0; i < drop_slots; i++) {
SlotState* drop = slot_state(arg_slot);
if (drop == NULL) break; // safety net
if (drop->_type != T_VOID) _outgoing_argc -= 1;
_outgoing.remove_at(arg_slot);
}
break;
}
case sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS: { //NYI, may GC
lose("unimplemented", CHECK_NULL);
break;
}
case sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS: {
klassOop array_klass_oop = NULL;
BasicType array_type = java_lang_Class::as_BasicType(chain().adapter_arg_oop(),
&array_klass_oop);
assert(array_type == T_OBJECT, "");
assert(Klass::cast(array_klass_oop)->oop_is_array(), "");
arrayKlassHandle array_klass(THREAD, array_klass_oop);
debug_only(array_klass_oop = (klassOop)badOop);
klassOop element_klass_oop = NULL;
BasicType element_type = java_lang_Class::as_BasicType(array_klass->component_mirror(),
&element_klass_oop);
KlassHandle element_klass(THREAD, element_klass_oop);
debug_only(element_klass_oop = (klassOop)badOop);
// Fetch the argument, which we will cast to the required array type.
assert(arg_state->_type == T_OBJECT, "");
ArgToken array_arg = arg_state->_arg;
array_arg = make_conversion(T_OBJECT, array_klass(), Bytecodes::_checkcast, array_arg, CHECK_NULL);
change_argument(T_OBJECT, arg_slot, T_VOID, NULL);
// Check the required length.
int spread_slots = 1 + chain().adapter_conversion_stack_pushes();
int spread_length = spread_slots;
if (type2size[element_type] == 2) {
if (spread_slots % 2 != 0) spread_slots = -1; // force error
spread_length = spread_slots / 2;
}
if (spread_slots < 0) {
lose("bad spread length", CHECK_NULL);
}
jvalue length_jvalue; length_jvalue.i = spread_length;
ArgToken length_arg = make_prim_constant(T_INT, &length_jvalue, CHECK_NULL);
// Call a built-in method known to the JVM to validate the length.
ArgToken arglist[3];
arglist[0] = array_arg; // value to check
arglist[1] = length_arg; // length to check
arglist[2] = NULL; // sentinel
make_invoke(NULL, vmIntrinsics::_checkSpreadArgument,
Bytecodes::_invokestatic, false, 3, &arglist[0], CHECK_NULL);
// Spread out the array elements.
Bytecodes::Code aload_op = Bytecodes::_aaload;
if (element_type != T_OBJECT) {
lose("primitive array NYI", CHECK_NULL);
}
int ap = arg_slot;
for (int i = 0; i < spread_length; i++) {
jvalue offset_jvalue; offset_jvalue.i = i;
ArgToken offset_arg = make_prim_constant(T_INT, &offset_jvalue, CHECK_NULL);
ArgToken element_arg = make_fetch(element_type, element_klass(), aload_op, array_arg, offset_arg, CHECK_NULL);
change_argument(T_VOID, ap, element_type, element_arg);
ap += type2size[element_type];
}
break;
}
case sun_dyn_AdapterMethodHandle::OP_FLYBY: //NYI, runs Java code
case sun_dyn_AdapterMethodHandle::OP_RICOCHET: //NYI, runs Java code
lose("unimplemented", CHECK_NULL);
break;
default:
lose("bad adapter conversion", CHECK_NULL);
break;
}
}
if (chain().is_bound()) {
// push a new argument
BasicType arg_type = chain().bound_arg_type();
jint arg_slot = chain().bound_arg_slot();
oop arg_oop = chain().bound_arg_oop();
ArgToken arg = NULL;
if (arg_type == T_OBJECT) {
arg = make_oop_constant(arg_oop, CHECK_NULL);
} else {
jvalue arg_value;
BasicType bt = java_lang_boxing_object::get_value(arg_oop, &arg_value);
if (bt == arg_type) {
arg = make_prim_constant(arg_type, &arg_value, CHECK_NULL);
} else {
lose("bad bound value", CHECK_NULL);
}
}
debug_only(arg_oop = badOop);
change_argument(T_VOID, arg_slot, arg_type, arg);
}
// this test must come after the body of the loop
if (!chain().is_last()) {
chain().next(CHECK_NULL);
} else {
break;
}
}
// finish the sequence with a tail-call to the ultimate target
// parameters are passed in logical order (recv 1st), not slot order
ArgToken* arglist = NEW_RESOURCE_ARRAY(ArgToken, _outgoing.length() + 1);
int ap = 0;
for (int i = _outgoing.length() - 1; i >= 0; i--) {
SlotState* arg_state = slot_state(i);
if (arg_state->_type == T_VOID) continue;
arglist[ap++] = _outgoing.at(i)._arg;
}
assert(ap == _outgoing_argc, "");
arglist[ap] = NULL; // add a sentinel, for the sake of asserts
return make_invoke(chain().last_method_oop(),
vmIntrinsics::_none,
chain().last_invoke_code(), true,
ap, arglist, THREAD);
}
void MethodHandleWalker::walk_incoming_state(TRAPS) {
Handle mtype(THREAD, chain().method_type_oop());
int nptypes = java_dyn_MethodType::ptype_count(mtype());
_outgoing_argc = nptypes;
int argp = nptypes - 1;
if (argp >= 0) {
_outgoing.at_grow(argp, make_state(T_VOID, NULL)); // presize
}
for (int i = 0; i < nptypes; i++) {
klassOop arg_type_klass = NULL;
BasicType arg_type = java_lang_Class::as_BasicType(
java_dyn_MethodType::ptype(mtype(), i), &arg_type_klass);
ArgToken arg = make_parameter(arg_type, arg_type_klass, i, CHECK);
debug_only(arg_type_klass = (klassOop)NULL);
_outgoing.at_put(argp, make_state(arg_type, arg));
if (type2size[arg_type] == 2) {
// add the extra slot, so we can model the JVM stack
_outgoing.insert_before(argp+1, make_state(T_VOID, NULL));
}
--argp;
}
// call make_parameter at the end of the list for the return type
klassOop ret_type_klass = NULL;
BasicType ret_type = java_lang_Class::as_BasicType(
java_dyn_MethodType::rtype(mtype()), &ret_type_klass);
ArgToken ret = make_parameter(ret_type, ret_type_klass, -1, CHECK);
// ignore ret; client can catch it if needed
}
// this is messy because some kinds of arguments are paired with
// companion slots containing an empty value
void MethodHandleWalker::change_argument(BasicType old_type, int slot, BasicType new_type,
MethodHandleWalker::ArgToken new_arg) {
int old_size = type2size[old_type];
int new_size = type2size[new_type];
if (old_size == new_size) {
// simple case first
_outgoing.at_put(slot, make_state(new_type, new_arg));
} else if (old_size > new_size) {
for (int i = old_size-1; i >= new_size; i++) {
assert((i != 0) == (_outgoing.at(slot + i)._type == T_VOID), "");
_outgoing.remove_at(slot + i);
}
if (new_size > 0)
_outgoing.at_put(slot, make_state(new_type, new_arg));
else
_outgoing_argc -= 1; // deleted a real argument
} else {
for (int i = old_size; i < new_size; i++) {
_outgoing.insert_before(slot+i, make_state(T_VOID, NULL));
}
_outgoing.at_put(slot, make_state(new_type, new_arg));
if (old_size == 0)
_outgoing_argc += 1; // inserted a real argument
}
}
#ifdef ASSERT
int MethodHandleWalker::argument_count_slow() {
int args_seen = 0;
for (int i = _outgoing.length() - 1; i >= 0; i--) {
if (_outgoing.at(i)._type != T_VOID) {
++args_seen;
}
}
return args_seen;
}
#endif
void MethodHandleCompiler::compile(TRAPS) {
assert(_thread == THREAD, "must be same thread");
_constant_oops.append(Handle()); // element zero is always the null constant
_constant_prims.append(NULL);
{
symbolOop sig
= java_dyn_MethodType::as_signature(chain().method_type_oop(), true, CHECK);
_signature_index = find_oop_constant(sig);
assert(signature() == sig, "");
}
walk(CHECK);
}
MethodHandleWalker::ArgToken
MethodHandleCompiler::make_conversion(BasicType type, klassOop tk, Bytecodes::Code op,
MethodHandleWalker::ArgToken src, TRAPS) {
Unimplemented();
return NULL;
}
MethodHandleWalker::ArgToken
MethodHandleCompiler::make_invoke(methodOop m, vmIntrinsics::ID iid,
Bytecodes::Code op, bool tailcall,
int argc, MethodHandleWalker::ArgToken* argv,
TRAPS) {
// If tailcall, we have walked all the way to a direct method handle.
// Otherwise, make a recursive call to some helper routine.
#ifdef ASSERT
switch (op) {
case Bytecodes::_invokevirtual:
case Bytecodes::_invokespecial:
case Bytecodes::_invokestatic:
case Bytecodes::_invokeinterface:
break;
default:
ShouldNotReachHere();
}
#endif //ASSERT
_bytes.put((char) op);
Unimplemented();
return NULL;
}
MethodHandleWalker::ArgToken
MethodHandleCompiler::make_fetch(BasicType type, klassOop tk, Bytecodes::Code op,
MethodHandleWalker::ArgToken base,
MethodHandleWalker::ArgToken offset,
TRAPS) {
Unimplemented();
return NULL;
}
int MethodHandleCompiler::find_oop_constant(oop con) {
if (con == NULL) return 0;
for (int i = 1, imax = _constant_oops.length(); i < imax; i++) {
if (_constant_oops.at(i) == con)
return i;
}
_constant_prims.append(NULL);
return _constant_oops.append(con);
}
int MethodHandleCompiler::find_prim_constant(BasicType bt, jvalue* con) {
jvalue con_copy;
assert(bt < T_OBJECT, "");
if (type2aelembytes(bt) < jintSize) {
// widen to int
con_copy = (*con);
con = &con_copy;
switch (bt) {
case T_BOOLEAN: con->i = (con->z ? 1 : 0); break;
case T_BYTE: con->i = con->b; break;
case T_CHAR: con->i = con->c; break;
case T_SHORT: con->i = con->s; break;
default: ShouldNotReachHere();
}
bt = T_INT;
}
for (int i = 1, imax = _constant_prims.length(); i < imax; i++) {
PrimCon* pcon = _constant_prims.at(i);
if (pcon != NULL && pcon->_type == bt) {
bool match = false;
switch (type2size[bt]) {
case 1: if (pcon->_value.i == con->i) match = true; break;
case 2: if (pcon->_value.j == con->j) match = true; break;
}
if (match)
return i;
}
}
PrimCon* pcon = new PrimCon();
pcon->_type = bt;
pcon->_value = (*con);
_constant_oops.append(Handle());
return _constant_prims.append(pcon);
}
#ifndef PRODUCT
// MH printer for debugging.
class MethodHandlePrinter : public MethodHandleWalker {
private:
outputStream* _out;
bool _verbose;
int _temp_num;
stringStream _strbuf;
const char* strbuf() {
const char* s = _strbuf.as_string();
_strbuf.reset();
return s;
}
ArgToken token(const char* str) {
return (ArgToken) str;
}
void start_params() {
_out->print("(");
}
void end_params() {
if (_verbose) _out->print("\n");
_out->print(") => {");
}
void put_type_name(BasicType type, klassOop tk, outputStream* s) {
const char* kname = NULL;
if (tk != NULL)
kname = Klass::cast(tk)->external_name();
s->print("%s", (kname != NULL) ? kname : type2name(type));
}
ArgToken maybe_make_temp(const char* statement_op, BasicType type, const char* temp_name) {
const char* value = strbuf();
if (!_verbose) return token(value);
// make an explicit binding for each separate value
_strbuf.print("%s%d", temp_name, ++_temp_num);
const char* temp = strbuf();
_out->print("\n %s %s %s = %s;", statement_op, type2name(type), temp, value);
return token(temp);
}
public:
MethodHandlePrinter(Handle root, bool verbose, outputStream* out, TRAPS)
: MethodHandleWalker(root, THREAD),
_out(out),
_verbose(verbose),
_temp_num(0)
{
start_params();
}
virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
if (argnum < 0) {
end_params();
return NULL;
}
if (argnum == 0) {
_out->print(_verbose ? "\n " : "");
} else {
_out->print(_verbose ? ",\n " : ", ");
}
if (argnum >= _temp_num)
_temp_num = argnum;
// generate an argument name
_strbuf.print("a%d", argnum);
const char* arg = strbuf();
put_type_name(type, tk, _out);
_out->print(" %s", arg);
return token(arg);
}
virtual ArgToken make_oop_constant(oop con, TRAPS) {
if (con == NULL)
_strbuf.print("null");
else
con->print_value_on(&_strbuf);
if (_strbuf.size() == 0) { // yuck
_strbuf.print("(a ");
put_type_name(T_OBJECT, con->klass(), &_strbuf);
_strbuf.print(")");
}
return maybe_make_temp("constant", T_OBJECT, "k");
}
virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
java_lang_boxing_object::print(type, con, &_strbuf);
return maybe_make_temp("constant", type, "k");
}
virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS) {
_strbuf.print("%s(%s", Bytecodes::name(op), (const char*)src);
if (tk != NULL) {
_strbuf.print(", ");
put_type_name(type, tk, &_strbuf);
}
_strbuf.print(")");
return maybe_make_temp("convert", type, "v");
}
virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS) {
_strbuf.print("%s(%s, %s", Bytecodes::name(op), (const char*)base, (const char*)offset);
if (tk != NULL) {
_strbuf.print(", ");
put_type_name(type, tk, &_strbuf);
}
_strbuf.print(")");
return maybe_make_temp("fetch", type, "x");
}
virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid,
Bytecodes::Code op, bool tailcall,
int argc, ArgToken* argv, TRAPS) {
symbolOop name, sig;
if (m != NULL) {
name = m->name();
sig = m->signature();
} else {
name = vmSymbols::symbol_at(vmIntrinsics::name_for(iid));
sig = vmSymbols::symbol_at(vmIntrinsics::signature_for(iid));
}
_strbuf.print("%s %s%s(", Bytecodes::name(op), name->as_C_string(), sig->as_C_string());
for (int i = 0; i < argc; i++) {
_strbuf.print("%s%s", (i > 0 ? ", " : ""), (const char*)argv[i]);
}
_strbuf.print(")");
if (!tailcall) {
BasicType rt = char2type(sig->byte_at(sig->utf8_length()-1));
if (rt == T_ILLEGAL) rt = T_OBJECT; // ';' at the end of '(...)L...;'
return maybe_make_temp("invoke", rt, "x");
} else {
const char* ret = strbuf();
_out->print(_verbose ? "\n return " : " ");
_out->print("%s", ret);
_out->print(_verbose ? "\n}\n" : " }");
}
return ArgToken();
}
virtual void set_method_handle(oop mh) {
if (WizardMode && Verbose) {
tty->print("\n--- next target: ");
mh->print();
}
}
static void print(Handle root, bool verbose, outputStream* out, TRAPS) {
ResourceMark rm;
MethodHandlePrinter printer(root, verbose, out, CHECK);
printer.walk(CHECK);
out->print("\n");
}
static void print(Handle root, bool verbose = Verbose, outputStream* out = tty) {
EXCEPTION_MARK;
ResourceMark rm;
MethodHandlePrinter printer(root, verbose, out, THREAD);
if (!HAS_PENDING_EXCEPTION)
printer.walk(THREAD);
if (HAS_PENDING_EXCEPTION) {
oop ex = PENDING_EXCEPTION;
CLEAR_PENDING_EXCEPTION;
out->print("\n*** ");
if (ex != Universe::virtual_machine_error_instance())
ex->print_on(out);
else
out->print("lose: %s", printer.lose_message());
out->print("\n}\n");
}
out->print("\n");
}
};
extern "C"
void print_method_handle(oop mh) {
if (java_dyn_MethodHandle::is_instance(mh)) {
MethodHandlePrinter::print(mh);
} else {
tty->print("*** not a method handle: ");
mh->print();
}
}
#endif // PRODUCT
src/share/vm/prims/methodHandleWalk.hpp 0 → 100644
浏览文件 @ d359f8ec
/*
* Copyright 2008-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
// Low-level parser for method handle chains.
class MethodHandleChain : StackObj {
public:
typedef MethodHandles::EntryKind EntryKind;
private:
Handle _root; // original target
Handle _method_handle; // current target
bool _is_last; // final guy in chain
bool _is_bound; // has a bound argument
BasicType _arg_type; // if is_bound, the bound argument type
int _arg_slot; // if is_bound or is_adapter, affected argument slot
jint _conversion; // conversion field of AMH or -1
methodHandle _last_method; // if is_last, which method we target
Bytecodes::Code _last_invoke; // if is_last, type of invoke
const char* _lose_message; // saved argument to lose()
void set_method_handle(Handle target, TRAPS);
void set_last_method(oop target, TRAPS);
static BasicType compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS);
oop MethodHandle_type_oop() { return java_dyn_MethodHandle::type(method_handle_oop()); }
oop MethodHandle_vmtarget_oop() { return java_dyn_MethodHandle::vmtarget(method_handle_oop()); }
int MethodHandle_vmslots() { return java_dyn_MethodHandle::vmslots(method_handle_oop()); }
int DirectMethodHandle_vmindex() { return sun_dyn_DirectMethodHandle::vmindex(method_handle_oop()); }
oop BoundMethodHandle_argument_oop() { return sun_dyn_BoundMethodHandle::argument(method_handle_oop()); }
int BoundMethodHandle_vmargslot() { return sun_dyn_BoundMethodHandle::vmargslot(method_handle_oop()); }
int AdapterMethodHandle_conversion() { return sun_dyn_AdapterMethodHandle::conversion(method_handle_oop()); }
public:
MethodHandleChain(Handle root, TRAPS)
: _root(root)
{ set_method_handle(root, THREAD); }
bool is_adapter() { return _conversion != -1; }
bool is_bound() { return _is_bound; }
bool is_last() { return _is_last; }
void next(TRAPS) {
assert(!is_last(), "");
set_method_handle(MethodHandle_vmtarget_oop(), THREAD);
}
Handle method_handle() { return _method_handle; }
oop method_handle_oop() { return _method_handle(); }
oop method_type_oop() { return MethodHandle_type_oop(); }
jint adapter_conversion() { assert(is_adapter(), ""); return _conversion; }
int adapter_conversion_op() { return MethodHandles::adapter_conversion_op(adapter_conversion()); }
BasicType adapter_conversion_src_type()
{ return MethodHandles::adapter_conversion_src_type(adapter_conversion()); }
BasicType adapter_conversion_dest_type()
{ return MethodHandles::adapter_conversion_dest_type(adapter_conversion()); }
int adapter_conversion_stack_move()
{ return MethodHandles::adapter_conversion_stack_move(adapter_conversion()); }
int adapter_conversion_stack_pushes()
{ return adapter_conversion_stack_move() / MethodHandles::stack_move_unit(); }
int adapter_conversion_vminfo()
{ return MethodHandles::adapter_conversion_vminfo(adapter_conversion()); }
int adapter_arg_slot() { assert(is_adapter(), ""); return _arg_slot; }
oop adapter_arg_oop() { assert(is_adapter(), ""); return BoundMethodHandle_argument_oop(); }
BasicType bound_arg_type() { assert(is_bound(), ""); return _arg_type; }
int bound_arg_slot() { assert(is_bound(), ""); return _arg_slot; }
oop bound_arg_oop() { assert(is_bound(), ""); return BoundMethodHandle_argument_oop(); }
methodOop last_method_oop() { assert(is_last(), ""); return _last_method(); }
Bytecodes::Code last_invoke_code() { assert(is_last(), ""); return _last_invoke; }
void lose(const char* msg, TRAPS);
const char* lose_message() { return _lose_message; }
};
// Structure walker for method handles.
// Does abstract interpretation on top of low-level parsing.
// You supply the tokens shuffled by the abstract interpretation.
class MethodHandleWalker : StackObj {
public:
struct _ArgToken { }; // dummy struct
typedef _ArgToken* ArgToken;
// Abstract interpretation state:
struct SlotState {
BasicType _type;
ArgToken _arg;
SlotState() : _type(), _arg() {}
};
static SlotState make_state(BasicType type, ArgToken arg) {
SlotState ss;
ss._type = type; ss._arg = arg;
return ss;
}
private:
MethodHandleChain _chain;
GrowableArray<SlotState> _outgoing; // current outgoing parameter slots
int _outgoing_argc; // # non-empty outgoing slots
// Replace a value of type old_type at slot (and maybe slot+1) with the new value.
// If old_type != T_VOID, remove the old argument at that point.
// If new_type != T_VOID, insert the new argument at that point.
// Insert or delete a second empty slot as needed.
void change_argument(BasicType old_type, int slot, BasicType new_type, ArgToken new_arg);
SlotState* slot_state(int slot) {
if (slot < 0 || slot >= _outgoing.length())
return NULL;
return _outgoing.adr_at(slot);
}
BasicType slot_type(int slot) {
SlotState* ss = slot_state(slot);
if (ss == NULL)
return T_ILLEGAL;
return ss->_type;
}
bool slot_has_argument(int slot) {
return slot_type(slot) < T_VOID;
}
#ifdef ASSERT
int argument_count_slow();
#endif
// Return a bytecode for converting src to dest, if one exists.
Bytecodes::Code conversion_code(BasicType src, BasicType dest);
void walk_incoming_state(TRAPS);
public:
MethodHandleWalker(Handle root, TRAPS)
: _chain(root, THREAD),
_outgoing(THREAD, 10),
_outgoing_argc(0)
{ }
MethodHandleChain& chain() { return _chain; }
// plug-in abstract interpretation steps:
virtual ArgToken make_parameter( BasicType type, klassOop tk, int argnum, TRAPS ) = 0;
virtual ArgToken make_prim_constant( BasicType type, jvalue* con, TRAPS ) = 0;
virtual ArgToken make_oop_constant( oop con, TRAPS ) = 0;
virtual ArgToken make_conversion( BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS ) = 0;
virtual ArgToken make_fetch( BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS ) = 0;
virtual ArgToken make_invoke( methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS ) = 0;
// For make_invoke, the methodOop can be NULL if the intrinsic ID
// is something other than vmIntrinsics::_none.
// and in case anyone cares to related the previous actions to the chain:
virtual void set_method_handle(oop mh) { }
void lose(const char* msg, TRAPS) { chain().lose(msg, THREAD); }
const char* lose_message() { return chain().lose_message(); }
ArgToken walk(TRAPS);
};
// An abstract interpreter for method handle chains.
// Produces an account of the semantics of a chain, in terms of a static IR.
// The IR happens to be JVM bytecodes.
class MethodHandleCompiler : public MethodHandleWalker {
private:
Thread* _thread;
struct PrimCon {
BasicType _type;
jvalue _value;
};
// Accumulated compiler state:
stringStream _bytes;
GrowableArray<Handle> _constant_oops;
GrowableArray<PrimCon*> _constant_prims;
int _max_stack;
int _num_params;
int _max_locals;
int _name_index;
int _signature_index;
// Stack values:
enum TokenType {
tt_void,
tt_parameter,
tt_temporary,
tt_constant
};
ArgToken make_stack_value(TokenType tt, BasicType type, int id) {
return ArgToken( ((intptr_t)id << 8) | ((intptr_t)type << 4) | (intptr_t)tt );
}
public:
virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
return make_stack_value(tt_parameter, type, argnum);
}
virtual ArgToken make_oop_constant(oop con, TRAPS) {
return make_stack_value(tt_constant, T_OBJECT, find_oop_constant(con));
}
virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
return make_stack_value(tt_constant, type, find_prim_constant(type, con));
}
virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS);
virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS);
virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS);
int find_oop_constant(oop con);
int find_prim_constant(BasicType type, jvalue* con);
public:
MethodHandleCompiler(Handle root, TRAPS)
: MethodHandleWalker(root, THREAD),
_thread(THREAD),
_bytes(50),
_constant_oops(THREAD, 10),
_constant_prims(THREAD, 10),
_max_stack(0), _max_locals(0),
_name_index(0), _signature_index(0)
{ }
const char* bytes() { return _bytes.as_string(); }
int constant_length() { return _constant_oops.length(); }
int max_stack() { return _max_stack; }
int max_locals() { return _max_locals; }
int name_index() { return _name_index; }
int signature_index() { return _signature_index; }
symbolHandle name() { return symbolHandle(_thread, (symbolOop)constant_oop_at(_name_index)()); }
symbolHandle signature() { return symbolHandle(_thread, (symbolOop)constant_oop_at(_signature_index)()); }
bool constant_is_oop_at(int i) {
return (_constant_prims.at(i) == NULL);
}
Handle constant_oop_at(int i) {
assert(constant_is_oop_at(i), "");
return _constant_oops.at(i);
}
PrimCon* constant_prim_at(int i) {
assert(!constant_is_oop_at(i), "");
return _constant_prims.at(i);
}
// Compile the given MH chain into bytecode.
void compile(TRAPS);
};
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