diff --git a/src/cpu/x86/vm/methodHandles_x86.cpp b/src/cpu/x86/vm/methodHandles_x86.cpp index 58024f2a8e1bf0df9edc545ac7efa63ec0302151..182587fdbbf53270060f64be0512302756d45313 100644 --- a/src/cpu/x86/vm/methodHandles_x86.cpp +++ b/src/cpu/x86/vm/methodHandles_x86.cpp @@ -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 diff --git a/src/share/vm/classfile/javaClasses.cpp b/src/share/vm/classfile/javaClasses.cpp index 1ca9c41c933534d2d5528933e39c34b43ed453d6..dd3851689eb6e679f2d2dd6556d120d5c7477a88 100644 --- a/src/share/vm/classfile/javaClasses.cpp +++ b/src/share/vm/classfile/javaClasses.cpp @@ -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 diff --git a/src/share/vm/classfile/javaClasses.hpp b/src/share/vm/classfile/javaClasses.hpp index b486670fc04880fef3e0193e85e268a662b9ea78..57bc30bab068f338df735fbd35a02f9461b42163 100644 --- a/src/share/vm/classfile/javaClasses.hpp +++ b/src/share/vm/classfile/javaClasses.hpp @@ -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); diff --git a/src/share/vm/classfile/vmSymbols.cpp b/src/share/vm/classfile/vmSymbols.cpp index cc96bee955bb14790933502cc07ef4318dbfc2d9..39393d4bf2b2a3036853a5e47604a8c747564fcb 100644 --- a/src/share/vm/classfile/vmSymbols.cpp +++ b/src/share/vm/classfile/vmSymbols.cpp @@ -1,5 +1,5 @@ /* - * 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< (1<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<> 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 ); } diff --git a/src/share/vm/classfile/vmSymbols.hpp b/src/share/vm/classfile/vmSymbols.hpp index aed7b874fdfa78ffaa47363ecf5e22a1226ab837..cde8220e2652ae7745a3386b21978c7e97857c94 100644 --- a/src/share/vm/classfile/vmSymbols.hpp +++ b/src/share/vm/classfile/vmSymbols.hpp @@ -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); }; diff --git a/src/share/vm/includeDB_core b/src/share/vm/includeDB_core index 6b0cf03f1b827a89fc6e8ceae63d79e1ae6a3d9d..dd4bb46381ceb0adcbf14b1336a438388bae1eff 100644 --- a/src/share/vm/includeDB_core +++ b/src/share/vm/includeDB_core @@ -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 diff --git a/src/share/vm/prims/methodHandleWalk.cpp b/src/share/vm/prims/methodHandleWalk.cpp new file mode 100644 index 0000000000000000000000000000000000000000..57d26a534cb83d634a45f7b0be5af98a12308de8 --- /dev/null +++ b/src/share/vm/prims/methodHandleWalk.cpp @@ -0,0 +1,805 @@ +/* + * 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 diff --git a/src/share/vm/prims/methodHandleWalk.hpp b/src/share/vm/prims/methodHandleWalk.hpp new file mode 100644 index 0000000000000000000000000000000000000000..772c13450bf405635fd84ecfd2a28363832be8a2 --- /dev/null +++ b/src/share/vm/prims/methodHandleWalk.hpp @@ -0,0 +1,269 @@ +/* + * 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 _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 _constant_oops; + GrowableArray _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); +};