1 /*
2 * Copyright (c) 1999, 2023, 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_CI_CIMETHOD_HPP
26 #define SHARE_CI_CIMETHOD_HPP
27
28 #include "ci/ciFlags.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciObject.hpp"
31 #include "ci/ciSignature.hpp"
32 #include "classfile/vmIntrinsics.hpp"
33 #include "compiler/methodLiveness.hpp"
34 #include "compiler/compilerOracle.hpp"
35 #include "oops/method.hpp"
36 #include "runtime/handles.hpp"
37 #include "utilities/bitMap.hpp"
38
39 class ciMethodBlocks;
40 class MethodLiveness;
41 class Arena;
42 class BCEscapeAnalyzer;
43 class InlineTree;
44 class xmlStream;
45
46 // Whether profiling found an oop to be always, never or sometimes
47 // null
48 enum ProfilePtrKind {
49 ProfileAlwaysNull,
50 ProfileNeverNull,
51 ProfileMaybeNull
52 };
53
54 // ciMethod
55 //
56 // This class represents a Method* in the HotSpot virtual
57 // machine.
58 class ciMethod : public ciMetadata {
59 friend class CompileBroker;
60 CI_PACKAGE_ACCESS
61 friend class ciEnv;
62 friend class ciExceptionHandlerStream;
63 friend class ciBytecodeStream;
64 friend class ciMethodHandle;
65 friend class ciReplay;
66 friend class InlineTree;
67
68 private:
69 // General method information.
70 ciFlags _flags;
71 ciSymbol* _name;
72 ciInstanceKlass* _holder;
73 ciSignature* _signature;
74 ciMethodData* _method_data;
75 ciMethodBlocks* _method_blocks;
76
77 // Code attributes.
78 int _code_size;
79 int _max_stack;
80 int _max_locals;
81 vmIntrinsicID _intrinsic_id;
82 int _handler_count;
83 int _interpreter_invocation_count;
84 int _interpreter_throwout_count;
85 int _inline_instructions_size;
86 int _size_of_parameters;
87
88 bool _uses_monitors;
89 bool _balanced_monitors;
90 bool _is_c1_compilable;
91 bool _is_c2_compilable;
92 bool _can_be_parsed;
93 bool _can_be_statically_bound;
94 bool _can_omit_stack_trace;
95 bool _has_reserved_stack_access;
96 bool _is_overpass;
97
98 // Lazy fields, filled in on demand
99 address _code;
100 ciExceptionHandler** _exception_handlers;
101
102 // Optional liveness analyzer.
103 MethodLiveness* _liveness;
104 #if defined(COMPILER2)
105 ciTypeFlow* _flow;
106 BCEscapeAnalyzer* _bcea;
107 #endif
108
109 ciMethod(const methodHandle& h_m, ciInstanceKlass* holder);
110 ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature, ciInstanceKlass* accessor);
111
112 oop loader() const { return _holder->loader(); }
113
114 const char* type_string() { return "ciMethod"; }
115
116 void print_impl(outputStream* st);
117
118 void load_code();
119
120 bool ensure_method_data(const methodHandle& h_m);
121
122 void code_at_put(int bci, Bytecodes::Code code) {
123 Bytecodes::check(code);
124 assert(0 <= bci && bci < code_size(), "valid bci");
125 address bcp = _code + bci;
126 *bcp = code;
127 }
128
129 // Check bytecode and profile data collected are compatible
130 void assert_virtual_call_type_ok(int bci);
131 void assert_call_type_ok(int bci);
132
133 // Check and update the profile counter in case of overflow
134 static int check_overflow(int c, Bytecodes::Code code);
135
136 public:
137 void check_is_loaded() const { assert(is_loaded(), "not loaded"); }
138
139 // Basic method information.
140 ciFlags flags() const { check_is_loaded(); return _flags; }
141 ciSymbol* name() const { return _name; }
142 ciInstanceKlass* holder() const { return _holder; }
143 ciMethodData* method_data();
144 ciMethodData* method_data_or_null();
145
146 // Signature information.
147 ciSignature* signature() const { return _signature; }
148 ciType* return_type() const { return _signature->return_type(); }
149 int arg_size_no_receiver() const { return _signature->size(); }
150 // Can only be used on loaded ciMethods
151 int arg_size() const {
152 check_is_loaded();
153 return _signature->size() + (_flags.is_static() ? 0 : 1);
154 }
155 // Report the number of elements on stack when invoking the current method.
156 // If the method is loaded, arg_size() gives precise information about the
157 // number of stack elements (using the method's signature and its flags).
158 // However, if the method is not loaded, the number of stack elements must
159 // be determined differently, as the method's flags are not yet available.
160 // The invoke_arg_size() method assumes in that case that all bytecodes except
161 // invokestatic and invokedynamic have a receiver that is also pushed onto the
162 // stack by the caller of the current method.
163 int invoke_arg_size(Bytecodes::Code code) const {
164 if (is_loaded()) {
165 return arg_size();
166 } else {
167 int arg_size = _signature->size();
168 if (code != Bytecodes::_invokestatic &&
169 code != Bytecodes::_invokedynamic) {
170 arg_size++;
171 }
172 return arg_size;
173 }
174 }
175
176 Method* get_Method() const {
177 Method* m = (Method*)_metadata;
178 assert(m != nullptr, "illegal use of unloaded method");
179 return m;
180 }
181
182 // Method code and related information.
183 address code() { if (_code == nullptr) load_code(); return _code; }
184 int code_size() const { check_is_loaded(); return _code_size; }
185 int max_stack() const { check_is_loaded(); return _max_stack; }
186 int max_locals() const { check_is_loaded(); return _max_locals; }
187 vmIntrinsicID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; }
188 bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; }
189 int exception_table_length() const { check_is_loaded(); return _handler_count; }
190 int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; }
191 int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; }
192 int size_of_parameters() const { check_is_loaded(); return _size_of_parameters; }
193
194 // Code size for inlining decisions.
195 int code_size_for_inlining();
196
197 bool caller_sensitive() const { return get_Method()->caller_sensitive(); }
198 bool force_inline() const { return get_Method()->force_inline(); }
199 bool dont_inline() const { return get_Method()->dont_inline(); }
200 bool intrinsic_candidate() const { return get_Method()->intrinsic_candidate(); }
201 bool is_static_initializer() const { return get_Method()->is_static_initializer(); }
202 bool changes_current_thread() const { return get_Method()->changes_current_thread(); }
203
204 bool check_intrinsic_candidate() const {
205 if (intrinsic_id() == vmIntrinsics::_blackhole) {
206 // This is the intrinsic without an associated method, so no intrinsic_candidate
207 // flag is set. The intrinsic is still correct.
208 return true;
209 }
210 return (CheckIntrinsics ? intrinsic_candidate() : true);
211 }
212
213 int highest_osr_comp_level();
214
215 Bytecodes::Code java_code_at_bci(int bci) {
216 address bcp = code() + bci;
217 return Bytecodes::java_code_at(nullptr, bcp);
218 }
219 Bytecodes::Code raw_code_at_bci(int bci) {
220 address bcp = code() + bci;
221 return Bytecodes::code_at(nullptr, bcp);
222 }
223 BCEscapeAnalyzer *get_bcea();
224 ciMethodBlocks *get_method_blocks();
225
226 bool has_linenumber_table() const; // length unknown until decompression
227
228 int line_number_from_bci(int bci) const;
229
230 // Runtime information.
231 int vtable_index();
232
233 // Analysis and profiling.
234 //
235 // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks.
236 bool has_monitor_bytecodes() const { return _uses_monitors; }
237 bool has_balanced_monitors();
238
239 // Returns a bitmap indicating which locals are required to be
240 // maintained as live for deopt. raw_liveness_at_bci is always the
241 // direct output of the liveness computation while liveness_at_bci
242 // may mark all locals as live to improve support for debugging Java
243 // code by maintaining the state of as many locals as possible.
244 MethodLivenessResult raw_liveness_at_bci(int bci);
245 MethodLivenessResult liveness_at_bci(int bci);
246
247 // Get the interpreters viewpoint on oop liveness. MethodLiveness is
248 // conservative in the sense that it may consider locals to be live which
249 // cannot be live, like in the case where a local could contain an oop or
250 // a primitive along different paths. In that case the local must be
251 // dead when those paths merge. Since the interpreter's viewpoint is
252 // used when gc'ing an interpreter frame we need to use its viewpoint
253 // during OSR when loading the locals.
254
255 ResourceBitMap live_local_oops_at_bci(int bci);
256
257 bool needs_clinit_barrier() const;
258
259 #ifdef COMPILER1
260 const BitMap& bci_block_start();
261 #endif
262
263 ciTypeFlow* get_flow_analysis();
264 ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point
265 ciCallProfile call_profile_at_bci(int bci);
266
267 // Does type profiling provide any useful information at this point?
268 bool argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind);
269 bool parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind);
270 bool return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind);
271
272 ciField* get_field_at_bci( int bci, bool &will_link);
273 ciMethod* get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature);
274 ciMethod* get_method_at_bci(int bci) {
275 bool ignored_will_link;
276 ciSignature* ignored_declared_signature;
277 return get_method_at_bci(bci, ignored_will_link, &ignored_declared_signature);
278 }
279
280 ciKlass* get_declared_method_holder_at_bci(int bci);
281
282 ciSignature* get_declared_signature_at_bci(int bci) {
283 bool ignored_will_link;
284 ciSignature* declared_signature;
285 get_method_at_bci(bci, ignored_will_link, &declared_signature);
286 assert(declared_signature != nullptr, "cannot be null");
287 return declared_signature;
288 }
289
290 // Given a certain calling environment, find the monomorphic target
291 // for the call. Return null if the call is not monomorphic in
292 // its calling environment.
293 ciMethod* find_monomorphic_target(ciInstanceKlass* caller,
294 ciInstanceKlass* callee_holder,
295 ciInstanceKlass* actual_receiver,
296 bool check_access = true);
297
298 // Given a known receiver klass, find the target for the call.
299 // Return null if the call has no target or is abstract.
300 ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access = true, bool allow_abstract = false);
301
302 // Find the proper vtable index to invoke this method.
303 int resolve_vtable_index(ciKlass* caller, ciKlass* receiver);
304
305 bool has_option(enum CompileCommand option);
306 bool has_option_value(enum CompileCommand option, double& value);
307 bool can_be_compiled();
308 bool can_be_parsed() const { return _can_be_parsed; }
309 bool has_compiled_code();
310 void log_nmethod_identity(xmlStream* log);
311 bool is_not_reached(int bci);
312 bool was_executed_more_than(int times);
313 bool has_unloaded_classes_in_signature();
314 bool is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const;
315 bool check_call(int refinfo_index, bool is_static) const;
316 bool ensure_method_data(); // make sure it exists in the VM also
317 MethodCounters* ensure_method_counters();
318
319 int inline_instructions_size();
320 int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC
321
322 // Stack walking support
323 bool is_ignored_by_security_stack_walk() const;
324
325 // JSR 292 support
326 bool is_method_handle_intrinsic() const;
327 bool is_compiled_lambda_form() const;
328 bool has_member_arg() const;
329
330 // What kind of ciObject is this?
331 bool is_method() const { return true; }
332
333 // Java access flags
334 bool is_public () const { return flags().is_public(); }
335 bool is_private () const { return flags().is_private(); }
336 bool is_protected () const { return flags().is_protected(); }
337 bool is_static () const { return flags().is_static(); }
338 bool is_final () const { return flags().is_final(); }
339 bool is_synchronized() const { return flags().is_synchronized(); }
340 bool is_native () const { return flags().is_native(); }
341 bool is_interface () const { return flags().is_interface(); }
342 bool is_abstract () const { return flags().is_abstract(); }
343
344 // Other flags
345 bool is_final_method() const { return is_final() || holder()->is_final(); }
346 bool is_default_method() const { return !is_abstract() && !is_private() &&
347 holder()->is_interface(); }
348 bool is_overpass () const { check_is_loaded(); return _is_overpass; }
349 bool has_loops () const;
350 bool has_jsrs () const;
351 bool is_getter () const;
352 bool is_setter () const;
353 bool is_accessor () const;
354 bool is_initializer () const;
355 bool is_empty () const;
356 bool can_be_statically_bound() const { return _can_be_statically_bound; }
357 bool has_reserved_stack_access() const { return _has_reserved_stack_access; }
358 bool is_boxing_method() const;
359 bool is_unboxing_method() const;
360 bool is_vector_method() const;
361 bool is_object_initializer() const;
362
363 bool can_be_statically_bound(ciInstanceKlass* context) const;
364
365 bool can_omit_stack_trace() const;
366
367 // Replay data methods
368 static void dump_name_as_ascii(outputStream* st, Method* method);
369 void dump_name_as_ascii(outputStream* st);
370 void dump_replay_data(outputStream* st);
371
372 // Print the bytecodes of this method.
373 void print_codes_on(outputStream* st);
374 void print_codes() {
375 print_codes_on(tty);
376 }
377 void print_codes_on(int from, int to, outputStream* st);
378
379 // Print the name of this method in various incarnations.
380 void print_name(outputStream* st = tty);
381 void print_short_name(outputStream* st = tty);
382
383 static bool is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method);
384 };
385
386 #endif // SHARE_CI_CIMETHOD_HPP