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comparison src/share/vm/prims/methodHandles.hpp @ 710:e5b0439ef4ae

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6655638: dynamic languages need method handles Summary: initial implementation, with known omissions (x86/64, sparc, compiler optim., c-oops, C++ interp.) Reviewed-by: kvn, twisti, never
author jrose
date Wed, 08 Apr 2009 10:56:49 -0700
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children 987e948ebbc8
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709:1d037ecd7960 710:e5b0439ef4ae
1 /*
2 * Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class MacroAssembler;
26 class Label;
27 class MethodHandleEntry;
28
29 class MethodHandles: AllStatic {
30 // JVM support for MethodHandle, MethodType, and related types
31 // in java.dyn and java.dyn.hotspot.
32 // See also javaClasses for layouts java_dyn_Method{Handle,Type,Type::Form}.
33 public:
34 enum EntryKind {
35 _check_mtype, // how a caller calls a MH
36 _wrong_method_type, // what happens when there is a type mismatch
37 _invokestatic_mh, // how a MH emulates invokestatic
38 _invokespecial_mh, // ditto for the other invokes...
39 _invokevirtual_mh,
40 _invokeinterface_mh,
41 _bound_ref_mh, // reference argument is bound
42 _bound_int_mh, // int argument is bound (via an Integer or Float)
43 _bound_long_mh, // long argument is bound (via a Long or Double)
44 _bound_ref_direct_mh, // same as above, with direct linkage to methodOop
45 _bound_int_direct_mh,
46 _bound_long_direct_mh,
47
48 _adapter_mh_first, // adapter sequence goes here...
49 _adapter_retype_only = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY,
50 _adapter_check_cast = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_CHECK_CAST,
51 _adapter_prim_to_prim = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM,
52 _adapter_ref_to_prim = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM,
53 _adapter_prim_to_ref = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF,
54 _adapter_swap_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS,
55 _adapter_rot_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_ROT_ARGS,
56 _adapter_dup_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DUP_ARGS,
57 _adapter_drop_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DROP_ARGS,
58 _adapter_collect_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS,
59 _adapter_spread_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS,
60 _adapter_flyby = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_FLYBY,
61 _adapter_ricochet = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RICOCHET,
62 _adapter_mh_last = _adapter_mh_first + sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT - 1,
63
64 // Optimized adapter types
65
66 // argument list reordering
67 _adapter_opt_swap_1,
68 _adapter_opt_swap_2,
69 _adapter_opt_rot_1_up,
70 _adapter_opt_rot_1_down,
71 _adapter_opt_rot_2_up,
72 _adapter_opt_rot_2_down,
73 // primitive single to single:
74 _adapter_opt_i2i, // i2c, i2z, i2b, i2s
75 // primitive double to single:
76 _adapter_opt_l2i,
77 _adapter_opt_d2f,
78 // primitive single to double:
79 _adapter_opt_i2l,
80 _adapter_opt_f2d,
81 // conversion between floating point and integer type is handled by Java
82
83 // reference to primitive:
84 _adapter_opt_unboxi,
85 _adapter_opt_unboxl,
86
87 // spreading (array length cases 0, 1, >=2)
88 _adapter_opt_spread_0,
89 _adapter_opt_spread_1,
90 _adapter_opt_spread_more,
91
92 _EK_LIMIT,
93 _EK_FIRST = 0
94 };
95
96 public:
97 static bool enabled() { return _enabled; }
98 static void set_enabled(bool z);
99
100 private:
101 enum { // import sun_dyn_AdapterMethodHandle::CONV_OP_*
102 CONV_OP_LIMIT = sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT,
103 CONV_OP_MASK = sun_dyn_AdapterMethodHandle::CONV_OP_MASK,
104 CONV_VMINFO_MASK = sun_dyn_AdapterMethodHandle::CONV_VMINFO_MASK,
105 CONV_VMINFO_SHIFT = sun_dyn_AdapterMethodHandle::CONV_VMINFO_SHIFT,
106 CONV_OP_SHIFT = sun_dyn_AdapterMethodHandle::CONV_OP_SHIFT,
107 CONV_DEST_TYPE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_DEST_TYPE_SHIFT,
108 CONV_SRC_TYPE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_SRC_TYPE_SHIFT,
109 CONV_STACK_MOVE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_SHIFT,
110 CONV_STACK_MOVE_MASK = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_MASK
111 };
112
113 static bool _enabled;
114 static MethodHandleEntry* _entries[_EK_LIMIT];
115 static const char* _entry_names[_EK_LIMIT+1];
116 static bool ek_valid(EntryKind ek) { return (uint)ek < (uint)_EK_LIMIT; }
117 static bool conv_op_valid(int op) { return (uint)op < (uint)CONV_OP_LIMIT; }
118
119 public:
120 static bool have_entry(EntryKind ek) { return ek_valid(ek) && _entries[ek] != NULL; }
121 static MethodHandleEntry* entry(EntryKind ek) { assert(ek_valid(ek), "initialized");
122 return _entries[ek]; }
123 static const char* entry_name(EntryKind ek) { assert(ek_valid(ek), "oob");
124 return _entry_names[ek]; }
125 static EntryKind adapter_entry_kind(int op) { assert(conv_op_valid(op), "oob");
126 return EntryKind(_adapter_mh_first + op); }
127
128 static void init_entry(EntryKind ek, MethodHandleEntry* me) {
129 assert(ek_valid(ek), "oob");
130 assert(_entries[ek] == NULL, "no double initialization");
131 _entries[ek] = me;
132 }
133
134 static jint adapter_conversion(int conv_op, BasicType src, BasicType dest,
135 int stack_move = 0, int vminfo = 0) {
136 assert(conv_op_valid(conv_op), "oob");
137 jint conv = ((conv_op << CONV_OP_SHIFT)
138 | (src << CONV_SRC_TYPE_SHIFT)
139 | (dest << CONV_DEST_TYPE_SHIFT)
140 | (stack_move << CONV_STACK_MOVE_SHIFT)
141 | (vminfo << CONV_VMINFO_SHIFT)
142 );
143 assert(adapter_conversion_op(conv) == conv_op, "decode conv_op");
144 assert(adapter_conversion_src_type(conv) == src, "decode src");
145 assert(adapter_conversion_dest_type(conv) == dest, "decode dest");
146 assert(adapter_conversion_stack_move(conv) == stack_move, "decode stack_move");
147 assert(adapter_conversion_vminfo(conv) == vminfo, "decode vminfo");
148 return conv;
149 }
150 static int adapter_conversion_op(jint conv) {
151 return ((conv >> CONV_OP_SHIFT) & 0xF);
152 }
153 static BasicType adapter_conversion_src_type(jint conv) {
154 return (BasicType)((conv >> CONV_SRC_TYPE_SHIFT) & 0xF);
155 }
156 static BasicType adapter_conversion_dest_type(jint conv) {
157 return (BasicType)((conv >> CONV_DEST_TYPE_SHIFT) & 0xF);
158 }
159 static int adapter_conversion_stack_move(jint conv) {
160 return (conv >> CONV_STACK_MOVE_SHIFT);
161 }
162 static int adapter_conversion_vminfo(jint conv) {
163 return (conv >> CONV_VMINFO_SHIFT) & CONV_VMINFO_MASK;
164 }
165
166 // Offset in words that the interpreter stack pointer moves when an argument is pushed.
167 // The stack_move value must always be a multiple of this.
168 static int stack_move_unit() {
169 return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords();
170 }
171
172 enum { CONV_VMINFO_SIGN_FLAG = 0x80 };
173 static int adapter_subword_vminfo(BasicType dest) {
174 if (dest == T_BOOLEAN) return (BitsPerInt - 1);
175 if (dest == T_CHAR) return (BitsPerInt - 16);
176 if (dest == T_BYTE) return (BitsPerInt - 8) | CONV_VMINFO_SIGN_FLAG;
177 if (dest == T_SHORT) return (BitsPerInt - 16) | CONV_VMINFO_SIGN_FLAG;
178 return 0; // case T_INT
179 }
180 // Here is the transformation the i2i adapter must perform:
181 static int truncate_subword_from_vminfo(jint value, int vminfo) {
182 jint tem = value << vminfo;
183 if ((vminfo & CONV_VMINFO_SIGN_FLAG) != 0) {
184 return (jint)tem >> vminfo;
185 } else {
186 return (juint)tem >> vminfo;
187 }
188 }
189
190 static inline address from_compiled_entry(EntryKind ek);
191 static inline address from_interpreted_entry(EntryKind ek);
192
193 // helpers for decode_method.
194 static methodOop decode_methodOop(methodOop m, int& decode_flags_result);
195 static methodOop decode_vmtarget(oop vmtarget, int vmindex, oop mtype, klassOop& receiver_limit_result, int& decode_flags_result);
196 static methodOop decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result);
197 static methodOop decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
198 static methodOop decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
199 static methodOop decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
200 static methodOop decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
201
202 // Find out how many stack slots an mh pushes or pops.
203 // The result is *not* reported as a multiple of stack_move_unit();
204 // It is a signed net number of pushes (a difference in vmslots).
205 // To compare with a stack_move value, first multiply by stack_move_unit().
206 static int decode_MethodHandle_stack_pushes(oop mh);
207
208 public:
209 // working with member names
210 static void resolve_MemberName(Handle mname, TRAPS); // compute vmtarget/vmindex from name/type
211 static void expand_MemberName(Handle mname, int suppress, TRAPS); // expand defc/name/type if missing
212 static void init_MemberName(oop mname_oop, oop target); // compute vmtarget/vmindex from target
213 static void init_MemberName(oop mname_oop, methodOop m, bool do_dispatch);
214 static void init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset);
215 static int find_MemberNames(klassOop k, symbolOop name, symbolOop sig,
216 int mflags, klassOop caller,
217 int skip, objArrayOop results);
218 // bit values for suppress argument to expand_MemberName:
219 enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 };
220
221 // called from InterpreterGenerator and StubGenerator
222 static address generate_method_handle_interpreter_entry(MacroAssembler* _masm);
223 static void generate_method_handle_stub(MacroAssembler* _masm, EntryKind ek);
224
225 // argument list parsing
226 static int argument_slot(oop method_type, int arg);
227 static int argument_slot_count(oop method_type) { return argument_slot(method_type, -1); }
228 static int argument_slot_to_argnum(oop method_type, int argslot);
229
230 // Runtime support
231 enum { // bit-encoded flags from decode_method or decode_vmref
232 _dmf_has_receiver = 0x01, // target method has leading reference argument
233 _dmf_does_dispatch = 0x02, // method handle performs virtual or interface dispatch
234 _dmf_from_interface = 0x04, // peforms interface dispatch
235 _DMF_DIRECT_MASK = (_dmf_from_interface*2 - _dmf_has_receiver),
236 _dmf_binds_method = 0x08,
237 _dmf_binds_argument = 0x10,
238 _DMF_BOUND_MASK = (_dmf_binds_argument*2 - _dmf_binds_method),
239 _dmf_adapter_lsb = 0x20,
240 _DMF_ADAPTER_MASK = (_dmf_adapter_lsb << CONV_OP_LIMIT) - _dmf_adapter_lsb
241 };
242 static methodOop decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result);
243 enum {
244 // format of query to getConstant:
245 GC_JVM_PUSH_LIMIT = 0,
246 GC_JVM_STACK_MOVE_LIMIT = 1,
247
248 // format of result from getTarget / encode_target:
249 ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
250 ETF_DIRECT_HANDLE = 1, // ultimate method handle (will be a DMH, may be self)
251 ETF_METHOD_NAME = 2, // ultimate method as MemberName
252 ETF_REFLECT_METHOD = 3 // ultimate method as java.lang.reflect object (sans refClass)
253 };
254 static int get_named_constant(int which, Handle name_box, TRAPS);
255 static oop encode_target(Handle mh, int format, TRAPS); // report vmtarget (to Java code)
256 static bool class_cast_needed(klassOop src, klassOop dst);
257
258 private:
259 // These checkers operate on a pair of whole MethodTypes:
260 static const char* check_method_type_change(oop src_mtype, int src_beg, int src_end,
261 int insert_argnum, oop insert_type,
262 int change_argnum, oop change_type,
263 int delete_argnum,
264 oop dst_mtype, int dst_beg, int dst_end);
265 static const char* check_method_type_insertion(oop src_mtype,
266 int insert_argnum, oop insert_type,
267 oop dst_mtype) {
268 oop no_ref = NULL;
269 return check_method_type_change(src_mtype, 0, -1,
270 insert_argnum, insert_type,
271 -1, no_ref, -1, dst_mtype, 0, -1);
272 }
273 static const char* check_method_type_conversion(oop src_mtype,
274 int change_argnum, oop change_type,
275 oop dst_mtype) {
276 oop no_ref = NULL;
277 return check_method_type_change(src_mtype, 0, -1, -1, no_ref,
278 change_argnum, change_type,
279 -1, dst_mtype, 0, -1);
280 }
281 static const char* check_method_type_passthrough(oop src_mtype, oop dst_mtype) {
282 oop no_ref = NULL;
283 return check_method_type_change(src_mtype, 0, -1,
284 -1, no_ref, -1, no_ref, -1,
285 dst_mtype, 0, -1);
286 }
287
288 // These checkers operate on pairs of argument or return types:
289 static const char* check_argument_type_change(BasicType src_type, klassOop src_klass,
290 BasicType dst_type, klassOop dst_klass,
291 int argnum);
292
293 static const char* check_argument_type_change(oop src_type, oop dst_type,
294 int argnum) {
295 klassOop src_klass = NULL, dst_klass = NULL;
296 BasicType src_bt = java_lang_Class::as_BasicType(src_type, &src_klass);
297 BasicType dst_bt = java_lang_Class::as_BasicType(dst_type, &dst_klass);
298 return check_argument_type_change(src_bt, src_klass,
299 dst_bt, dst_klass, argnum);
300 }
301
302 static const char* check_return_type_change(oop src_type, oop dst_type) {
303 return check_argument_type_change(src_type, dst_type, -1);
304 }
305
306 static const char* check_return_type_change(BasicType src_type, klassOop src_klass,
307 BasicType dst_type, klassOop dst_klass) {
308 return check_argument_type_change(src_type, src_klass, dst_type, dst_klass, -1);
309 }
310
311 static const char* check_method_receiver(methodOop m, klassOop passed_recv_type);
312
313 // These verifiers can block, and will throw an error if the checking fails:
314 static void verify_vmslots(Handle mh, TRAPS);
315 static void verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS);
316
317 static void verify_method_type(methodHandle m, Handle mtype,
318 bool has_bound_oop,
319 KlassHandle bound_oop_type,
320 TRAPS);
321
322 static void verify_method_signature(methodHandle m, Handle mtype,
323 int first_ptype_pos,
324 KlassHandle insert_ptype, TRAPS);
325
326 static void verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS);
327 static void verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
328 bool direct_to_method, TRAPS);
329 static void verify_BoundMethodHandle_with_receiver(Handle mh, methodHandle m, TRAPS);
330 static void verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS);
331
332 public:
333
334 // Fill in the fields of a DirectMethodHandle mh. (MH.type must be pre-filled.)
335 static void init_DirectMethodHandle(Handle mh, methodHandle method, bool do_dispatch, TRAPS);
336
337 // Fill in the fields of a BoundMethodHandle mh. (MH.type, BMH.argument must be pre-filled.)
338 static void init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
339 static void init_BoundMethodHandle_with_receiver(Handle mh,
340 methodHandle original_m,
341 KlassHandle receiver_limit,
342 int decode_flags,
343 TRAPS);
344
345 // Fill in the fields of an AdapterMethodHandle mh. (MH.type must be pre-filled.)
346 static void init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
347
348 #ifdef ASSERT
349 static bool spot_check_entry_names();
350 #endif
351
352 private:
353 static methodHandle dispatch_decoded_method(methodHandle m,
354 KlassHandle receiver_limit,
355 int decode_flags,
356 KlassHandle receiver_klass,
357 TRAPS);
358
359 static bool same_basic_type_for_arguments(BasicType src, BasicType dst,
360 bool for_return = false);
361 static bool same_basic_type_for_returns(BasicType src, BasicType dst) {
362 return same_basic_type_for_arguments(src, dst, true);
363 }
364
365 enum { // arg_mask values
366 _INSERT_NO_MASK = -1,
367 _INSERT_REF_MASK = 0,
368 _INSERT_INT_MASK = 1,
369 _INSERT_LONG_MASK = 3
370 };
371 static void insert_arg_slots(MacroAssembler* _masm,
372 RegisterOrConstant arg_slots,
373 int arg_mask,
374 Register rax_argslot,
375 Register rbx_temp, Register rdx_temp);
376
377 static void remove_arg_slots(MacroAssembler* _masm,
378 RegisterOrConstant arg_slots,
379 Register rax_argslot,
380 Register rbx_temp, Register rdx_temp);
381 };
382
383
384 // Access methods for the "entry" field of a java.dyn.MethodHandle.
385 // The field is primarily a jump target for compiled calls.
386 // However, we squirrel away some nice pointers for other uses,
387 // just before the jump target.
388 // Aspects of a method handle entry:
389 // - from_compiled_entry - stub used when compiled code calls the MH
390 // - from_interpreted_entry - stub used when the interpreter calls the MH
391 // - type_checking_entry - stub for runtime casting between MHForm siblings (NYI)
392 class MethodHandleEntry {
393 public:
394 class Data {
395 friend class MethodHandleEntry;
396 size_t _total_size; // size including Data and code stub
397 MethodHandleEntry* _type_checking_entry;
398 address _from_interpreted_entry;
399 MethodHandleEntry* method_entry() { return (MethodHandleEntry*)(this + 1); }
400 };
401
402 Data* data() { return (Data*)this - 1; }
403
404 address start_address() { return (address) data(); }
405 address end_address() { return start_address() + data()->_total_size; }
406
407 address from_compiled_entry() { return (address) this; }
408
409 address from_interpreted_entry() { return data()->_from_interpreted_entry; }
410 void set_from_interpreted_entry(address e) { data()->_from_interpreted_entry = e; }
411
412 MethodHandleEntry* type_checking_entry() { return data()->_type_checking_entry; }
413 void set_type_checking_entry(MethodHandleEntry* e) { data()->_type_checking_entry = e; }
414
415 void set_end_address(address end_addr) {
416 size_t total_size = end_addr - start_address();
417 assert(total_size > 0 && total_size < 0x1000, "reasonable end address");
418 data()->_total_size = total_size;
419 }
420
421 // Compiler support:
422 static int from_interpreted_entry_offset_in_bytes() {
423 return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
424 }
425 static int type_checking_entry_offset_in_bytes() {
426 return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
427 }
428
429 static address start_compiled_entry(MacroAssembler* _masm,
430 address interpreted_entry = NULL);
431 static MethodHandleEntry* finish_compiled_entry(MacroAssembler* masm, address start_addr);
432 };
433
434 address MethodHandles::from_compiled_entry(EntryKind ek) { return entry(ek)->from_compiled_entry(); }
435 address MethodHandles::from_interpreted_entry(EntryKind ek) { return entry(ek)->from_interpreted_entry(); }