Thu, 09 Dec 2010 15:04:26 -0500
7004582: Add GetThisObject() function to JVMTI 1.2
Summary: Add 'GetThisObject' function
Reviewed-by: never, coleenp
1 /*
2 * Copyright (c) 2008, 2010, 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 */
25 #ifndef SHARE_VM_PRIMS_METHODHANDLEWALK_HPP
26 #define SHARE_VM_PRIMS_METHODHANDLEWALK_HPP
28 #include "prims/methodHandles.hpp"
30 // Low-level parser for method handle chains.
31 class MethodHandleChain : StackObj {
32 public:
33 typedef MethodHandles::EntryKind EntryKind;
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()
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);
51 oop MethodHandle_type_oop() { return java_dyn_MethodHandle::type(method_handle_oop()); }
52 oop MethodHandle_vmtarget_oop() { return java_dyn_MethodHandle::vmtarget(method_handle_oop()); }
53 int MethodHandle_vmslots() { return java_dyn_MethodHandle::vmslots(method_handle_oop()); }
54 int DirectMethodHandle_vmindex() { return sun_dyn_DirectMethodHandle::vmindex(method_handle_oop()); }
55 oop BoundMethodHandle_argument_oop() { return sun_dyn_BoundMethodHandle::argument(method_handle_oop()); }
56 int BoundMethodHandle_vmargslot() { return sun_dyn_BoundMethodHandle::vmargslot(method_handle_oop()); }
57 int AdapterMethodHandle_conversion() { return sun_dyn_AdapterMethodHandle::conversion(method_handle_oop()); }
59 public:
60 MethodHandleChain(Handle root, TRAPS)
61 : _root(root)
62 { set_method_handle(root, THREAD); }
64 bool is_adapter() { return _conversion != -1; }
65 bool is_bound() { return _is_bound; }
66 bool is_last() { return _is_last; }
68 void next(TRAPS) {
69 assert(!is_last(), "");
70 set_method_handle(MethodHandle_vmtarget_oop(), THREAD);
71 }
73 Handle method_handle() { return _method_handle; }
74 oop method_handle_oop() { return _method_handle(); }
75 oop method_type_oop() { return MethodHandle_type_oop(); }
76 oop vmtarget_oop() { return MethodHandle_vmtarget_oop(); }
78 jint adapter_conversion() { assert(is_adapter(), ""); return _conversion; }
79 int adapter_conversion_op() { return MethodHandles::adapter_conversion_op(adapter_conversion()); }
80 BasicType adapter_conversion_src_type()
81 { return MethodHandles::adapter_conversion_src_type(adapter_conversion()); }
82 BasicType adapter_conversion_dest_type()
83 { return MethodHandles::adapter_conversion_dest_type(adapter_conversion()); }
84 int adapter_conversion_stack_move()
85 { return MethodHandles::adapter_conversion_stack_move(adapter_conversion()); }
86 int adapter_conversion_stack_pushes()
87 { return adapter_conversion_stack_move() / MethodHandles::stack_move_unit(); }
88 int adapter_conversion_vminfo()
89 { return MethodHandles::adapter_conversion_vminfo(adapter_conversion()); }
90 int adapter_arg_slot() { assert(is_adapter(), ""); return _arg_slot; }
91 oop adapter_arg_oop() { assert(is_adapter(), ""); return BoundMethodHandle_argument_oop(); }
93 BasicType bound_arg_type() { assert(is_bound(), ""); return _arg_type; }
94 int bound_arg_slot() { assert(is_bound(), ""); return _arg_slot; }
95 oop bound_arg_oop() { assert(is_bound(), ""); return BoundMethodHandle_argument_oop(); }
97 methodOop last_method_oop() { assert(is_last(), ""); return _last_method(); }
98 Bytecodes::Code last_invoke_code() { assert(is_last(), ""); return _last_invoke; }
100 void lose(const char* msg, TRAPS);
101 const char* lose_message() { return _lose_message; }
102 };
105 // Structure walker for method handles.
106 // Does abstract interpretation on top of low-level parsing.
107 // You supply the tokens shuffled by the abstract interpretation.
108 class MethodHandleWalker : StackObj {
109 public:
110 // Stack values:
111 enum TokenType {
112 tt_void,
113 tt_parameter,
114 tt_temporary,
115 tt_constant,
116 tt_illegal
117 };
119 // Argument token:
120 class ArgToken {
121 private:
122 TokenType _tt;
123 BasicType _bt;
124 jvalue _value;
125 Handle _handle;
127 public:
128 ArgToken(TokenType tt = tt_illegal) : _tt(tt) {}
129 ArgToken(TokenType tt, BasicType bt, jvalue value) : _tt(tt), _bt(bt), _value(value) {}
131 ArgToken(TokenType tt, BasicType bt, int index) : _tt(tt), _bt(bt) {
132 _value.i = index;
133 }
135 ArgToken(TokenType tt, BasicType bt, Handle value) : _tt(tt), _bt(bt) {
136 _handle = value;
137 }
139 TokenType token_type() const { return _tt; }
140 BasicType basic_type() const { return _bt; }
141 int index() const { return _value.i; }
142 Handle object() const { return _handle; }
144 jint get_jint() const { return _value.i; }
145 jlong get_jlong() const { return _value.j; }
146 jfloat get_jfloat() const { return _value.f; }
147 jdouble get_jdouble() const { return _value.d; }
148 };
150 // Abstract interpretation state:
151 struct SlotState {
152 BasicType _type;
153 ArgToken _arg;
154 SlotState() : _type(), _arg() {}
155 };
156 static SlotState make_state(BasicType type, ArgToken arg) {
157 SlotState ss;
158 ss._type = type; ss._arg = arg;
159 return ss;
160 }
162 private:
163 MethodHandleChain _chain;
164 bool _for_invokedynamic;
165 int _local_index;
167 GrowableArray<SlotState> _outgoing; // current outgoing parameter slots
168 int _outgoing_argc; // # non-empty outgoing slots
170 // Replace a value of type old_type at slot (and maybe slot+1) with the new value.
171 // If old_type != T_VOID, remove the old argument at that point.
172 // If new_type != T_VOID, insert the new argument at that point.
173 // Insert or delete a second empty slot as needed.
174 void change_argument(BasicType old_type, int slot, BasicType new_type, const ArgToken& new_arg);
176 SlotState* slot_state(int slot) {
177 if (slot < 0 || slot >= _outgoing.length())
178 return NULL;
179 return _outgoing.adr_at(slot);
180 }
181 BasicType slot_type(int slot) {
182 SlotState* ss = slot_state(slot);
183 if (ss == NULL)
184 return T_ILLEGAL;
185 return ss->_type;
186 }
187 bool slot_has_argument(int slot) {
188 return slot_type(slot) < T_VOID;
189 }
191 #ifdef ASSERT
192 int argument_count_slow();
193 #endif
195 // Return a bytecode for converting src to dest, if one exists.
196 Bytecodes::Code conversion_code(BasicType src, BasicType dest);
198 void walk_incoming_state(TRAPS);
200 public:
201 MethodHandleWalker(Handle root, bool for_invokedynamic, TRAPS)
202 : _chain(root, THREAD),
203 _for_invokedynamic(for_invokedynamic),
204 _outgoing(THREAD, 10),
205 _outgoing_argc(0)
206 {
207 _local_index = for_invokedynamic ? 0 : 1;
208 }
210 MethodHandleChain& chain() { return _chain; }
212 bool for_invokedynamic() const { return _for_invokedynamic; }
214 int new_local_index(BasicType bt) {
215 //int index = _for_invokedynamic ? _local_index : _local_index - 1;
216 int index = _local_index;
217 _local_index += type2size[bt];
218 return index;
219 }
221 int max_locals() const { return _local_index; }
223 // plug-in abstract interpretation steps:
224 virtual ArgToken make_parameter( BasicType type, klassOop tk, int argnum, TRAPS ) = 0;
225 virtual ArgToken make_prim_constant( BasicType type, jvalue* con, TRAPS ) = 0;
226 virtual ArgToken make_oop_constant( oop con, TRAPS ) = 0;
227 virtual ArgToken make_conversion( BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS ) = 0;
228 virtual ArgToken make_fetch( BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS ) = 0;
229 virtual ArgToken make_invoke( methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS ) = 0;
231 // For make_invoke, the methodOop can be NULL if the intrinsic ID
232 // is something other than vmIntrinsics::_none.
234 // and in case anyone cares to related the previous actions to the chain:
235 virtual void set_method_handle(oop mh) { }
237 void lose(const char* msg, TRAPS) { chain().lose(msg, THREAD); }
238 const char* lose_message() { return chain().lose_message(); }
240 ArgToken walk(TRAPS);
241 };
244 // An abstract interpreter for method handle chains.
245 // Produces an account of the semantics of a chain, in terms of a static IR.
246 // The IR happens to be JVM bytecodes.
247 class MethodHandleCompiler : public MethodHandleWalker {
248 private:
249 methodHandle _callee;
250 KlassHandle _rklass; // Return type for casting.
251 BasicType _rtype;
252 KlassHandle _target_klass;
253 Thread* _thread;
255 // Fake constant pool entry.
256 class ConstantValue {
257 private:
258 int _tag; // Constant pool tag type.
259 JavaValue _value;
260 Handle _handle;
262 public:
263 // Constructor for oop types.
264 ConstantValue(int tag, Handle con) : _tag(tag), _handle(con) {
265 assert(tag == JVM_CONSTANT_Utf8 ||
266 tag == JVM_CONSTANT_Class ||
267 tag == JVM_CONSTANT_String ||
268 tag == JVM_CONSTANT_Object, "must be oop type");
269 }
271 // Constructor for oop reference types.
272 ConstantValue(int tag, int index) : _tag(tag) {
273 assert(JVM_CONSTANT_Fieldref <= tag && tag <= JVM_CONSTANT_NameAndType, "must be ref type");
274 _value.set_jint(index);
275 }
276 ConstantValue(int tag, int first_index, int second_index) : _tag(tag) {
277 assert(JVM_CONSTANT_Fieldref <= tag && tag <= JVM_CONSTANT_NameAndType, "must be ref type");
278 _value.set_jint(first_index << 16 | second_index);
279 }
281 // Constructor for primitive types.
282 ConstantValue(BasicType bt, jvalue con) {
283 _value.set_type(bt);
284 switch (bt) {
285 case T_INT: _tag = JVM_CONSTANT_Integer; _value.set_jint( con.i); break;
286 case T_LONG: _tag = JVM_CONSTANT_Long; _value.set_jlong( con.j); break;
287 case T_FLOAT: _tag = JVM_CONSTANT_Float; _value.set_jfloat( con.f); break;
288 case T_DOUBLE: _tag = JVM_CONSTANT_Double; _value.set_jdouble(con.d); break;
289 default: ShouldNotReachHere();
290 }
291 }
293 int tag() const { return _tag; }
294 symbolOop symbol_oop() const { return (symbolOop) _handle(); }
295 klassOop klass_oop() const { return (klassOop) _handle(); }
296 oop object_oop() const { return _handle(); }
297 int index() const { return _value.get_jint(); }
298 int first_index() const { return _value.get_jint() >> 16; }
299 int second_index() const { return _value.get_jint() & 0x0000FFFF; }
301 bool is_primitive() const { return is_java_primitive(_value.get_type()); }
302 jint get_jint() const { return _value.get_jint(); }
303 jlong get_jlong() const { return _value.get_jlong(); }
304 jfloat get_jfloat() const { return _value.get_jfloat(); }
305 jdouble get_jdouble() const { return _value.get_jdouble(); }
306 };
308 // Fake constant pool.
309 GrowableArray<ConstantValue*> _constants;
311 // Accumulated compiler state:
312 GrowableArray<unsigned char> _bytecode;
314 int _cur_stack;
315 int _max_stack;
316 int _num_params;
317 int _name_index;
318 int _signature_index;
320 void stack_push(BasicType bt) {
321 _cur_stack += type2size[bt];
322 if (_cur_stack > _max_stack) _max_stack = _cur_stack;
323 }
324 void stack_pop(BasicType bt) {
325 _cur_stack -= type2size[bt];
326 assert(_cur_stack >= 0, "sanity");
327 }
329 unsigned char* bytecode() const { return _bytecode.adr_at(0); }
330 int bytecode_length() const { return _bytecode.length(); }
332 // Fake constant pool.
333 int cpool_oop_put(int tag, Handle con) {
334 if (con.is_null()) return 0;
335 ConstantValue* cv = new ConstantValue(tag, con);
336 return _constants.append(cv);
337 }
339 int cpool_oop_reference_put(int tag, int first_index, int second_index) {
340 if (first_index == 0 && second_index == 0) return 0;
341 assert(first_index != 0 && second_index != 0, "no zero indexes");
342 ConstantValue* cv = new ConstantValue(tag, first_index, second_index);
343 return _constants.append(cv);
344 }
346 int cpool_primitive_put(BasicType type, jvalue* con);
348 int cpool_int_put(jint value) {
349 jvalue con; con.i = value;
350 return cpool_primitive_put(T_INT, &con);
351 }
352 int cpool_long_put(jlong value) {
353 jvalue con; con.j = value;
354 return cpool_primitive_put(T_LONG, &con);
355 }
356 int cpool_float_put(jfloat value) {
357 jvalue con; con.f = value;
358 return cpool_primitive_put(T_FLOAT, &con);
359 }
360 int cpool_double_put(jdouble value) {
361 jvalue con; con.d = value;
362 return cpool_primitive_put(T_DOUBLE, &con);
363 }
365 int cpool_object_put(Handle obj) {
366 return cpool_oop_put(JVM_CONSTANT_Object, obj);
367 }
368 int cpool_symbol_put(symbolOop sym) {
369 return cpool_oop_put(JVM_CONSTANT_Utf8, sym);
370 }
371 int cpool_klass_put(klassOop klass) {
372 return cpool_oop_put(JVM_CONSTANT_Class, klass);
373 }
374 int cpool_methodref_put(int class_index, int name_and_type_index) {
375 return cpool_oop_reference_put(JVM_CONSTANT_Methodref, class_index, name_and_type_index);
376 }
377 int cpool_name_and_type_put(int name_index, int signature_index) {
378 return cpool_oop_reference_put(JVM_CONSTANT_NameAndType, name_index, signature_index);
379 }
381 void emit_bc(Bytecodes::Code op, int index = 0);
382 void emit_load(BasicType bt, int index);
383 void emit_store(BasicType bt, int index);
384 void emit_load_constant(ArgToken arg);
386 virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
387 return ArgToken(tt_parameter, type, argnum);
388 }
389 virtual ArgToken make_oop_constant(oop con, TRAPS) {
390 Handle h(THREAD, con);
391 return ArgToken(tt_constant, T_OBJECT, h);
392 }
393 virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
394 return ArgToken(tt_constant, type, *con);
395 }
397 virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS);
398 virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS);
399 virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS);
401 // Get a real constant pool.
402 constantPoolHandle get_constant_pool(TRAPS) const;
404 // Get a real methodOop.
405 methodHandle get_method_oop(TRAPS) const;
407 public:
408 MethodHandleCompiler(Handle root, methodHandle call_method, bool for_invokedynamic, TRAPS);
410 // Compile the given MH chain into bytecode.
411 methodHandle compile(TRAPS);
413 // Tests if the given class is a MH adapter holder.
414 static bool klass_is_method_handle_adapter_holder(klassOop klass) {
415 return (klass == SystemDictionary::MethodHandle_klass() ||
416 klass == SystemDictionary::InvokeDynamic_klass());
417 }
418 };
420 #endif // SHARE_VM_PRIMS_METHODHANDLEWALK_HPP