1 /*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_PRIMS_METHODHANDLEWALK_HPP
26 #define SHARE_VM_PRIMS_METHODHANDLEWALK_HPP
27
28 #include "prims/methodHandles.hpp"
29
30 // Low-level parser for method handle chains.
31 class MethodHandleChain : StackObj {
32 public:
33 typedef MethodHandles::EntryKind EntryKind;
34
35 private:
36 Handle _root; // original target
37 Handle _method_handle; // current target
38 bool _is_last; // final guy in chain
39 bool _is_bound; // has a bound argument
40 BasicType _arg_type; // if is_bound, the bound argument type
41 int _arg_slot; // if is_bound or is_adapter, affected argument slot
42 jint _conversion; // conversion field of AMH or -1
43 methodHandle _last_method; // if is_last, which method we target
44 Bytecodes::Code _last_invoke; // if is_last, type of invoke
45 const char* _lose_message; // saved argument to lose()
46
47 void set_method_handle(Handle target, TRAPS);
48 void set_last_method(oop target, TRAPS);
49 static BasicType compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS);
50
51 oop MethodHandle_type_oop() { return java_lang_invoke_MethodHandle::type(method_handle_oop()); }
52 oop MethodHandle_vmtarget_oop() { return java_lang_invoke_MethodHandle::vmtarget(method_handle_oop()); }
53 int MethodHandle_vmslots() { return java_lang_invoke_MethodHandle::vmslots(method_handle_oop()); }
54 int DirectMethodHandle_vmindex() { return java_lang_invoke_DirectMethodHandle::vmindex(method_handle_oop()); }
55 oop BoundMethodHandle_argument_oop() { return java_lang_invoke_BoundMethodHandle::argument(method_handle_oop()); }
56 int BoundMethodHandle_vmargslot() { return java_lang_invoke_BoundMethodHandle::vmargslot(method_handle_oop()); }
57 int AdapterMethodHandle_conversion() { return java_lang_invoke_AdapterMethodHandle::conversion(method_handle_oop()); }
58
59 #ifdef ASSERT
60 void print_impl(TRAPS);
61 #endif
62
63 public:
64 MethodHandleChain(Handle root, TRAPS)
65 : _root(root)
66 { set_method_handle(root, THREAD); }
67
68 bool is_adapter() { return _conversion != -1; }
69 bool is_bound() { return _is_bound; }
70 bool is_last() { return _is_last; }
71
72 void next(TRAPS) {
73 assert(!is_last(), "");
74 set_method_handle(MethodHandle_vmtarget_oop(), THREAD);
75 }
76
77 Handle root() { return _root; }
78 Handle method_handle() { return _method_handle; }
79 oop method_handle_oop() { return _method_handle(); }
80 oop method_type_oop() { return MethodHandle_type_oop(); }
81 oop vmtarget_oop() { return MethodHandle_vmtarget_oop(); }
82
83 jint adapter_conversion() { assert(is_adapter(), ""); return _conversion; }
84 int adapter_conversion_op() { return MethodHandles::adapter_conversion_op(adapter_conversion()); }
85 BasicType adapter_conversion_src_type()
86 { return MethodHandles::adapter_conversion_src_type(adapter_conversion()); }
87 BasicType adapter_conversion_dest_type()
88 { return MethodHandles::adapter_conversion_dest_type(adapter_conversion()); }
89 int adapter_conversion_stack_move()
90 { return MethodHandles::adapter_conversion_stack_move(adapter_conversion()); }
91 int adapter_conversion_stack_pushes()
92 { return adapter_conversion_stack_move() / MethodHandles::stack_move_unit(); }
93 int adapter_conversion_vminfo()
94 { return MethodHandles::adapter_conversion_vminfo(adapter_conversion()); }
95 int adapter_arg_slot() { assert(is_adapter(), ""); return _arg_slot; }
96 oop adapter_arg_oop() { assert(is_adapter(), ""); return BoundMethodHandle_argument_oop(); }
97
98 BasicType bound_arg_type() { assert(is_bound(), ""); return _arg_type; }
99 int bound_arg_slot() { assert(is_bound(), ""); return _arg_slot; }
100 oop bound_arg_oop() { assert(is_bound(), ""); return BoundMethodHandle_argument_oop(); }
101
102 methodHandle last_method() { assert(is_last(), ""); return _last_method; }
103 methodOop last_method_oop() { assert(is_last(), ""); return _last_method(); }
104 Bytecodes::Code last_invoke_code() { assert(is_last(), ""); return _last_invoke; }
105
106 void lose(const char* msg, TRAPS);
107 const char* lose_message() { return _lose_message; }
108
109 #ifdef ASSERT
110 // Print a symbolic description of a method handle chain, including
111 // the signature for each method. The signatures are printed in
112 // slot order to make it easier to understand.
113 void print();
114 static void print(oopDesc* mh);
115 #endif
116 };
117
118
119 // Structure walker for method handles.
120 // Does abstract interpretation on top of low-level parsing.
121 // You supply the tokens shuffled by the abstract interpretation.
122 class MethodHandleWalker : StackObj {
123 public:
124 // Stack values:
125 enum TokenType {
126 tt_void,
127 tt_parameter,
128 tt_temporary,
129 tt_constant,
130 tt_symbolic,
131 tt_illegal
132 };
133
134 // Argument token:
135 class ArgToken {
136 private:
137 TokenType _tt;
138 BasicType _bt;
139 jvalue _value;
140 Handle _handle;
141
142 public:
143 ArgToken(TokenType tt = tt_illegal) : _tt(tt), _bt(tt == tt_void ? T_VOID : T_ILLEGAL) {
144 assert(tt == tt_illegal || tt == tt_void, "invalid token type");
145 }
146
147 ArgToken(TokenType tt, BasicType bt, int index) : _tt(tt), _bt(bt) {
148 assert(_tt == tt_parameter || _tt == tt_temporary, "must have index");
149 _value.i = index;
150 }
151
152 ArgToken(BasicType bt, jvalue value) : _tt(tt_constant), _bt(bt), _value(value) { assert(_bt != T_OBJECT, "wrong constructor"); }
153 ArgToken(Handle handle) : _tt(tt_constant), _bt(T_OBJECT), _handle(handle) {}
154
155
156 ArgToken(const char* str, BasicType type) : _tt(tt_symbolic), _bt(type) {
157 _value.j = (intptr_t)str;
158 }
159
160 TokenType token_type() const { return _tt; }
161 BasicType basic_type() const { return _bt; }
162 bool has_index() const { return _tt == tt_parameter || _tt == tt_temporary; }
163 int index() const { assert(has_index(), "must have index");; return _value.i; }
164 Handle object() const { assert(_bt == T_OBJECT, "wrong accessor"); assert(_tt == tt_constant, "value type"); return _handle; }
165 const char* str() const { assert(_tt == tt_symbolic, "string type"); return (const char*)(intptr_t)_value.j; }
166
167 jint get_jint() const { assert(_bt == T_INT || is_subword_type(_bt), "wrong accessor"); assert(_tt == tt_constant, "value types"); return _value.i; }
168 jlong get_jlong() const { assert(_bt == T_LONG, "wrong accessor"); assert(_tt == tt_constant, "value types"); return _value.j; }
169 jfloat get_jfloat() const { assert(_bt == T_FLOAT, "wrong accessor"); assert(_tt == tt_constant, "value types"); return _value.f; }
170 jdouble get_jdouble() const { assert(_bt == T_DOUBLE, "wrong accessor"); assert(_tt == tt_constant, "value types"); return _value.d; }
171 };
172
173 private:
174 MethodHandleChain _chain;
175 bool _for_invokedynamic;
176 int _local_index;
177
178 // This array is kept in an unusual order, indexed by low-level "slot number".
179 // TOS is always _outgoing.at(0), so simple pushes and pops shift the whole _outgoing array.
180 // If there is a receiver in the current argument list, it is at _outgoing.at(_outgoing.length()-1).
181 // If a value at _outgoing.at(n) is T_LONG or T_DOUBLE, the value at _outgoing.at(n+1) is T_VOID.
182 GrowableArray<ArgToken> _outgoing; // current outgoing parameter slots
183 int _outgoing_argc; // # non-empty outgoing slots
184
185 vmIntrinsics::ID _return_conv; // Return conversion required by raw retypes.
186
187 // Replace a value of type old_type at slot (and maybe slot+1) with the new value.
188 // If old_type != T_VOID, remove the old argument at that point.
189 // If new_type != T_VOID, insert the new argument at that point.
190 // Insert or delete a second empty slot as needed.
191 void change_argument(BasicType old_type, int slot, const ArgToken& new_arg);
192 void change_argument(BasicType old_type, int slot, BasicType type, const ArgToken& new_arg) {
193 assert(type == new_arg.basic_type(), "must agree");
194 change_argument(old_type, slot, new_arg);
195 }
196
197 // Raw retype conversions for OP_RAW_RETYPE.
198 void retype_raw_conversion(BasicType src, BasicType dst, bool for_return, int slot, TRAPS);
199 void retype_raw_argument_type(BasicType src, BasicType dst, int slot, TRAPS) { retype_raw_conversion(src, dst, false, slot, CHECK); }
200 void retype_raw_return_type( BasicType src, BasicType dst, TRAPS) { retype_raw_conversion(src, dst, true, -1, CHECK); }
201
202 BasicType arg_type(int slot) {
203 return _outgoing.at(slot).basic_type();
204 }
205 bool has_argument(int slot) {
206 return arg_type(slot) < T_VOID;
207 }
208
209 #ifdef ASSERT
210 int argument_count_slow();
211 #endif
212
213 // Return a bytecode for converting src to dest, if one exists.
214 Bytecodes::Code conversion_code(BasicType src, BasicType dest);
215
216 void walk_incoming_state(TRAPS);
217
218 void verify_args_and_signature(TRAPS) NOT_DEBUG_RETURN;
219
220 public:
221 MethodHandleWalker(Handle root, bool for_invokedynamic, TRAPS)
222 : _chain(root, THREAD),
223 _for_invokedynamic(for_invokedynamic),
224 _outgoing(THREAD, 10),
225 _outgoing_argc(0),
226 _return_conv(vmIntrinsics::_none)
227 {
228 _local_index = for_invokedynamic ? 0 : 1;
229 }
230
231 MethodHandleChain& chain() { return _chain; }
232
233 bool for_invokedynamic() const { return _for_invokedynamic; }
234
235 vmIntrinsics::ID return_conv() const { return _return_conv; }
236 void set_return_conv(vmIntrinsics::ID c) { _return_conv = c; }
237 static vmIntrinsics::ID zero_return_conv() { return vmIntrinsics::_min; }
238
239 int new_local_index(BasicType bt) {
240 //int index = _for_invokedynamic ? _local_index : _local_index - 1;
241 int index = _local_index;
242 _local_index += type2size[bt];
243 return index;
244 }
245
246 int max_locals() const { return _local_index; }
247
248 // plug-in abstract interpretation steps:
249 virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) = 0;
250 virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) = 0;
251 virtual ArgToken make_oop_constant(oop con, TRAPS) = 0;
252 virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS) = 0;
253 virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS) = 0;
254 virtual ArgToken make_invoke(methodHandle m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS) = 0;
255
256 // For make_invoke, the methodHandle can be NULL if the intrinsic ID
257 // is something other than vmIntrinsics::_none.
258
259 // and in case anyone cares to related the previous actions to the chain:
260 virtual void set_method_handle(oop mh) { }
261
262 void lose(const char* msg, TRAPS) { chain().lose(msg, THREAD); }
263 const char* lose_message() { return chain().lose_message(); }
264
265 ArgToken walk(TRAPS);
266 };
267
268
269 // An abstract interpreter for method handle chains.
270 // Produces an account of the semantics of a chain, in terms of a static IR.
271 // The IR happens to be JVM bytecodes.
272 class MethodHandleCompiler : public MethodHandleWalker {
273 private:
274 int _invoke_count; // count the original call site has been executed
275 KlassHandle _rklass; // Return type for casting.
276 BasicType _rtype;
277 KlassHandle _target_klass;
278 Thread* _thread;
279
280 int _selectAlternative_bci; // These are used for capturing profiles from GWTs
281 int _taken_count;
282 int _not_taken_count;
283
284 // Values used by the compiler.
285 static jvalue zero_jvalue;
286 static jvalue one_jvalue;
287
288 // Fake constant pool entry.
289 class ConstantValue : public ResourceObj {
290 private:
291 int _tag; // Constant pool tag type.
292 JavaValue _value;
293 Handle _handle;
294 Symbol* _sym;
295 methodHandle _method; // pre-linkage
296
297 public:
298 // Constructor for oop types.
299 ConstantValue(int tag, Handle con) : _tag(tag), _handle(con) {
300 assert(tag == JVM_CONSTANT_Class ||
301 tag == JVM_CONSTANT_String ||
302 tag == JVM_CONSTANT_Object, "must be oop type");
303 }
304
305 ConstantValue(int tag, Symbol* con) : _tag(tag), _sym(con) {
306 assert(tag == JVM_CONSTANT_Utf8, "must be symbol type");
307 }
308
309 // Constructor for oop reference types.
310 ConstantValue(int tag, int index) : _tag(tag) {
311 assert(JVM_CONSTANT_Fieldref <= tag && tag <= JVM_CONSTANT_NameAndType, "must be ref type");
312 _value.set_jint(index);
313 }
314 ConstantValue(int tag, int first_index, int second_index) : _tag(tag) {
315 assert(JVM_CONSTANT_Fieldref <= tag && tag <= JVM_CONSTANT_NameAndType, "must be ref type");
316 _value.set_jint(first_index << 16 | second_index);
317 }
318
319 // Constructor for primitive types.
320 ConstantValue(BasicType bt, jvalue con) {
321 _value.set_type(bt);
322 switch (bt) {
323 case T_INT: _tag = JVM_CONSTANT_Integer; _value.set_jint( con.i); break;
324 case T_LONG: _tag = JVM_CONSTANT_Long; _value.set_jlong( con.j); break;
325 case T_FLOAT: _tag = JVM_CONSTANT_Float; _value.set_jfloat( con.f); break;
326 case T_DOUBLE: _tag = JVM_CONSTANT_Double; _value.set_jdouble(con.d); break;
327 default: ShouldNotReachHere();
328 }
329 }
330
331 int tag() const { return _tag; }
332 Symbol* symbol() const { return _sym; }
333 klassOop klass_oop() const { return (klassOop) _handle(); }
334 oop object_oop() const { return _handle(); }
335 int index() const { return _value.get_jint(); }
336 int first_index() const { return _value.get_jint() >> 16; }
337 int second_index() const { return _value.get_jint() & 0x0000FFFF; }
338
339 bool is_primitive() const { return is_java_primitive(_value.get_type()); }
340 jint get_jint() const { return _value.get_jint(); }
341 jlong get_jlong() const { return _value.get_jlong(); }
342 jfloat get_jfloat() const { return _value.get_jfloat(); }
343 jdouble get_jdouble() const { return _value.get_jdouble(); }
344
345 void set_linkage(methodHandle method) {
346 assert(_method.is_null(), "");
347 _method = method;
348 }
349 bool has_linkage() const { return _method.not_null(); }
350 methodHandle linkage() const { return _method; }
351 };
352
353 // Fake constant pool.
354 GrowableArray<ConstantValue*> _constants;
355
356 // Non-BCP classes that appear in associated MethodTypes (require special handling).
357 GrowableArray<KlassHandle> _non_bcp_klasses;
358
359 // Accumulated compiler state:
360 GrowableArray<unsigned char> _bytecode;
361
362 int _cur_stack;
363 int _max_stack;
364 int _num_params;
365 int _name_index;
366 int _signature_index;
367
368 void stack_push(BasicType bt) {
369 _cur_stack += type2size[bt];
370 if (_cur_stack > _max_stack) _max_stack = _cur_stack;
371 }
372 void stack_pop(BasicType bt) {
373 _cur_stack -= type2size[bt];
374 assert(_cur_stack >= 0, "sanity");
375 }
376
377 unsigned char* bytecode() const { return _bytecode.adr_at(0); }
378 int bytecode_length() const { return _bytecode.length(); }
379 int cur_bci() const { return _bytecode.length(); }
380
381 // Fake constant pool.
382 int cpool_oop_put(int tag, Handle con) {
383 if (con.is_null()) return 0;
384 ConstantValue* cv = new ConstantValue(tag, con);
385 return _constants.append(cv);
386 }
387
388 int cpool_symbol_put(int tag, Symbol* con) {
389 if (con == NULL) return 0;
390 ConstantValue* cv = new ConstantValue(tag, con);
391 con->increment_refcount();
392 return _constants.append(cv);
393 }
394
395 int cpool_oop_reference_put(int tag, int first_index, int second_index, methodHandle method) {
396 if (first_index == 0 && second_index == 0) return 0;
397 assert(first_index != 0 && second_index != 0, "no zero indexes");
398 ConstantValue* cv = new ConstantValue(tag, first_index, second_index);
399 if (method.not_null()) cv->set_linkage(method);
400 return _constants.append(cv);
401 }
402
403 int cpool_primitive_put(BasicType type, jvalue* con);
404
405 bool check_non_bcp_klasses(Handle method_type, TRAPS);
406 bool check_non_bcp_klass(klassOop klass, TRAPS);
407 void record_non_bcp_klasses();
408
409 int cpool_int_put(jint value) {
410 jvalue con; con.i = value;
411 return cpool_primitive_put(T_INT, &con);
412 }
413 int cpool_long_put(jlong value) {
414 jvalue con; con.j = value;
415 return cpool_primitive_put(T_LONG, &con);
416 }
417 int cpool_float_put(jfloat value) {
418 jvalue con; con.f = value;
419 return cpool_primitive_put(T_FLOAT, &con);
420 }
421 int cpool_double_put(jdouble value) {
422 jvalue con; con.d = value;
423 return cpool_primitive_put(T_DOUBLE, &con);
424 }
425
426 int cpool_object_put(Handle obj) {
427 return cpool_oop_put(JVM_CONSTANT_Object, obj);
428 }
429 int cpool_symbol_put(Symbol* sym) {
430 return cpool_symbol_put(JVM_CONSTANT_Utf8, sym);
431 }
432 int cpool_klass_put(klassOop klass) {
433 return cpool_oop_put(JVM_CONSTANT_Class, klass);
434 }
435 int cpool_methodref_put(Bytecodes::Code op, int class_index, int name_and_type_index, methodHandle method) {
436 int tag = (op == Bytecodes::_invokeinterface ? JVM_CONSTANT_InterfaceMethodref : JVM_CONSTANT_Methodref);
437 return cpool_oop_reference_put(tag, class_index, name_and_type_index, method);
438 }
439 int cpool_name_and_type_put(int name_index, int signature_index) {
440 return cpool_oop_reference_put(JVM_CONSTANT_NameAndType, name_index, signature_index, methodHandle());
441 }
442
443 void emit_bc(Bytecodes::Code op, int index = 0, int args_size = -1);
444 void update_branch_dest(int src, int dst);
445 void emit_load(ArgToken arg);
446 void emit_load(BasicType bt, int index);
447 void emit_store(BasicType bt, int index);
448 void emit_load_constant(ArgToken arg);
449
450 virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
451 return ArgToken(tt_parameter, type, argnum);
452 }
453 virtual ArgToken make_oop_constant(oop con, TRAPS) {
454 Handle h(THREAD, con);
455 return ArgToken(h);
456 }
457 virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
458 return ArgToken(type, *con);
459 }
460
461 virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS);
462 virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS);
463 virtual ArgToken make_invoke(methodHandle m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS);
464
465 // Check for profiling information on a GWT and return true if it's found
466 bool fetch_counts(ArgToken a1, ArgToken a2);
467
468 // Get a real constant pool.
469 constantPoolHandle get_constant_pool(TRAPS) const;
470
471 // Get a real methodOop.
472 methodHandle get_method_oop(TRAPS);
473
474 public:
475 MethodHandleCompiler(Handle root, Symbol* name, Symbol* signature, int invoke_count, bool for_invokedynamic, TRAPS);
476
477 // Compile the given MH chain into bytecode.
478 methodHandle compile(TRAPS);
479
480 // Tests if the given class is a MH adapter holder.
481 static bool klass_is_method_handle_adapter_holder(klassOop klass) {
482 return (klass == SystemDictionary::MethodHandle_klass());
483 }
484 };
485
486 #endif // SHARE_VM_PRIMS_METHODHANDLEWALK_HPP