Thu, 29 Jan 2015 10:25:59 -0800
8063137: Never-taken branches should be pruned when GWT LambdaForms are shared
Reviewed-by: jrose, kvn
1 /*
2 * Copyright (c) 1999, 2013, 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.
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23 */
25 #ifndef SHARE_VM_CI_CIMETHOD_HPP
26 #define SHARE_VM_CI_CIMETHOD_HPP
28 #include "ci/ciFlags.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciObject.hpp"
31 #include "ci/ciSignature.hpp"
32 #include "compiler/methodLiveness.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "utilities/bitMap.hpp"
36 class ciMethodBlocks;
37 class MethodLiveness;
38 class BitMap;
39 class Arena;
40 class BCEscapeAnalyzer;
43 // ciMethod
44 //
45 // This class represents a Method* in the HotSpot virtual
46 // machine.
47 class ciMethod : public ciMetadata {
48 friend class CompileBroker;
49 CI_PACKAGE_ACCESS
50 friend class ciEnv;
51 friend class ciExceptionHandlerStream;
52 friend class ciBytecodeStream;
53 friend class ciMethodHandle;
54 friend class ciReplay;
56 private:
57 // General method information.
58 ciFlags _flags;
59 ciSymbol* _name;
60 ciInstanceKlass* _holder;
61 ciSignature* _signature;
62 ciMethodData* _method_data;
63 ciMethodBlocks* _method_blocks;
65 // Code attributes.
66 int _code_size;
67 int _max_stack;
68 int _max_locals;
69 vmIntrinsics::ID _intrinsic_id;
70 int _handler_count;
71 int _interpreter_invocation_count;
72 int _interpreter_throwout_count;
73 int _instructions_size;
74 int _size_of_parameters;
76 bool _uses_monitors;
77 bool _balanced_monitors;
78 bool _is_c1_compilable;
79 bool _is_c2_compilable;
80 bool _can_be_statically_bound;
81 bool _has_injected_profile;
83 // Lazy fields, filled in on demand
84 address _code;
85 ciExceptionHandler** _exception_handlers;
87 // Optional liveness analyzer.
88 MethodLiveness* _liveness;
89 #if defined(COMPILER2) || defined(SHARK)
90 ciTypeFlow* _flow;
91 BCEscapeAnalyzer* _bcea;
92 #endif
94 ciMethod(methodHandle h_m, ciInstanceKlass* holder);
95 ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature, ciInstanceKlass* accessor);
97 Method* get_Method() const {
98 Method* m = (Method*)_metadata;
99 assert(m != NULL, "illegal use of unloaded method");
100 return m;
101 }
103 oop loader() const { return _holder->loader(); }
105 const char* type_string() { return "ciMethod"; }
107 void print_impl(outputStream* st);
109 void load_code();
111 void check_is_loaded() const { assert(is_loaded(), "not loaded"); }
113 bool ensure_method_data(methodHandle h_m);
115 void code_at_put(int bci, Bytecodes::Code code) {
116 Bytecodes::check(code);
117 assert(0 <= bci && bci < code_size(), "valid bci");
118 address bcp = _code + bci;
119 *bcp = code;
120 }
122 // Check bytecode and profile data collected are compatible
123 void assert_virtual_call_type_ok(int bci);
124 void assert_call_type_ok(int bci);
126 public:
127 // Basic method information.
128 ciFlags flags() const { check_is_loaded(); return _flags; }
129 ciSymbol* name() const { return _name; }
130 ciInstanceKlass* holder() const { return _holder; }
131 ciMethodData* method_data();
132 ciMethodData* method_data_or_null();
134 // Signature information.
135 ciSignature* signature() const { return _signature; }
136 ciType* return_type() const { return _signature->return_type(); }
137 int arg_size_no_receiver() const { return _signature->size(); }
138 // Can only be used on loaded ciMethods
139 int arg_size() const {
140 check_is_loaded();
141 return _signature->size() + (_flags.is_static() ? 0 : 1);
142 }
143 // Report the number of elements on stack when invoking this method.
144 // This is different than the regular arg_size because invokedynamic
145 // has an implicit receiver.
146 int invoke_arg_size(Bytecodes::Code code) const {
147 if (is_loaded()) {
148 return arg_size();
149 } else {
150 int arg_size = _signature->size();
151 // Add a receiver argument, maybe:
152 if (code != Bytecodes::_invokestatic &&
153 code != Bytecodes::_invokedynamic) {
154 arg_size++;
155 }
156 return arg_size;
157 }
158 }
161 // Method code and related information.
162 address code() { if (_code == NULL) load_code(); return _code; }
163 int code_size() const { check_is_loaded(); return _code_size; }
164 int max_stack() const { check_is_loaded(); return _max_stack; }
165 int max_locals() const { check_is_loaded(); return _max_locals; }
166 vmIntrinsics::ID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; }
167 bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; }
168 int exception_table_length() const { check_is_loaded(); return _handler_count; }
169 int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; }
170 int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; }
171 int size_of_parameters() const { check_is_loaded(); return _size_of_parameters; }
173 // Code size for inlining decisions.
174 int code_size_for_inlining();
176 bool caller_sensitive() { return get_Method()->caller_sensitive(); }
177 bool force_inline() { return get_Method()->force_inline(); }
178 bool dont_inline() { return get_Method()->dont_inline(); }
180 int comp_level();
181 int highest_osr_comp_level();
183 Bytecodes::Code java_code_at_bci(int bci) {
184 address bcp = code() + bci;
185 return Bytecodes::java_code_at(NULL, bcp);
186 }
187 Bytecodes::Code raw_code_at_bci(int bci) {
188 address bcp = code() + bci;
189 return Bytecodes::code_at(NULL, bcp);
190 }
191 BCEscapeAnalyzer *get_bcea();
192 ciMethodBlocks *get_method_blocks();
194 bool has_linenumber_table() const; // length unknown until decompression
195 u_char* compressed_linenumber_table() const; // not preserved by gc
197 int line_number_from_bci(int bci) const;
199 // Runtime information.
200 int vtable_index();
201 #ifdef SHARK
202 int itable_index();
203 #endif // SHARK
204 address native_entry();
205 address interpreter_entry();
207 // Analysis and profiling.
208 //
209 // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks.
210 bool has_monitor_bytecodes() const { return _uses_monitors; }
211 bool has_balanced_monitors();
213 // Returns a bitmap indicating which locals are required to be
214 // maintained as live for deopt. raw_liveness_at_bci is always the
215 // direct output of the liveness computation while liveness_at_bci
216 // may mark all locals as live to improve support for debugging Java
217 // code by maintaining the state of as many locals as possible.
218 MethodLivenessResult raw_liveness_at_bci(int bci);
219 MethodLivenessResult liveness_at_bci(int bci);
221 // Get the interpreters viewpoint on oop liveness. MethodLiveness is
222 // conservative in the sense that it may consider locals to be live which
223 // cannot be live, like in the case where a local could contain an oop or
224 // a primitive along different paths. In that case the local must be
225 // dead when those paths merge. Since the interpreter's viewpoint is
226 // used when gc'ing an interpreter frame we need to use its viewpoint
227 // during OSR when loading the locals.
229 BitMap live_local_oops_at_bci(int bci);
231 #ifdef COMPILER1
232 const BitMap bci_block_start();
233 #endif
235 ciTypeFlow* get_flow_analysis();
236 ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point
237 ciCallProfile call_profile_at_bci(int bci);
238 int interpreter_call_site_count(int bci);
240 // Does type profiling provide a useful type at this point?
241 ciKlass* argument_profiled_type(int bci, int i);
242 ciKlass* parameter_profiled_type(int i);
243 ciKlass* return_profiled_type(int bci);
245 ciField* get_field_at_bci( int bci, bool &will_link);
246 ciMethod* get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature);
247 // Given a certain calling environment, find the monomorphic target
248 // for the call. Return NULL if the call is not monomorphic in
249 // its calling environment.
250 ciMethod* find_monomorphic_target(ciInstanceKlass* caller,
251 ciInstanceKlass* callee_holder,
252 ciInstanceKlass* actual_receiver);
254 // Given a known receiver klass, find the target for the call.
255 // Return NULL if the call has no target or is abstract.
256 ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver);
258 // Find the proper vtable index to invoke this method.
259 int resolve_vtable_index(ciKlass* caller, ciKlass* receiver);
261 // Compilation directives
262 bool should_exclude();
263 bool should_inline();
264 bool should_not_inline();
265 bool should_print_assembly();
266 bool break_at_execute();
267 bool has_option(const char *option);
268 template<typename T>
269 bool has_option_value(const char* option, T& value);
270 bool can_be_compiled();
271 bool can_be_osr_compiled(int entry_bci);
272 void set_not_compilable(const char* reason = NULL);
273 bool has_compiled_code();
274 void log_nmethod_identity(xmlStream* log);
275 bool is_not_reached(int bci);
276 bool was_executed_more_than(int times);
277 bool has_unloaded_classes_in_signature();
278 bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const;
279 bool check_call(int refinfo_index, bool is_static) const;
280 bool ensure_method_data(); // make sure it exists in the VM also
281 MethodCounters* ensure_method_counters();
282 int instructions_size();
283 int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC
285 bool has_injected_profile() const { return _has_injected_profile; }
286 void set_injected_profile(bool x) { _has_injected_profile = x; }
288 // Stack walking support
289 bool is_ignored_by_security_stack_walk() const;
291 // JSR 292 support
292 bool is_method_handle_intrinsic() const;
293 bool is_compiled_lambda_form() const;
294 bool has_member_arg() const;
296 // What kind of ciObject is this?
297 bool is_method() const { return true; }
299 // Java access flags
300 bool is_public () const { return flags().is_public(); }
301 bool is_private () const { return flags().is_private(); }
302 bool is_protected () const { return flags().is_protected(); }
303 bool is_static () const { return flags().is_static(); }
304 bool is_final () const { return flags().is_final(); }
305 bool is_synchronized() const { return flags().is_synchronized(); }
306 bool is_native () const { return flags().is_native(); }
307 bool is_interface () const { return flags().is_interface(); }
308 bool is_abstract () const { return flags().is_abstract(); }
309 bool is_strict () const { return flags().is_strict(); }
311 // Other flags
312 bool is_empty_method() const;
313 bool is_vanilla_constructor() const;
314 bool is_final_method() const { return is_final() || holder()->is_final(); }
315 bool has_loops () const;
316 bool has_jsrs () const;
317 bool is_accessor () const;
318 bool is_initializer () const;
319 bool can_be_statically_bound() const { return _can_be_statically_bound; }
320 bool is_boxing_method() const;
321 bool is_unboxing_method() const;
323 // Replay data methods
324 void dump_name_as_ascii(outputStream* st);
325 void dump_replay_data(outputStream* st);
327 // Print the bytecodes of this method.
328 void print_codes_on(outputStream* st);
329 void print_codes() {
330 print_codes_on(tty);
331 }
332 void print_codes_on(int from, int to, outputStream* st);
334 // Print the name of this method in various incarnations.
335 void print_name(outputStream* st = tty);
336 void print_short_name(outputStream* st = tty);
337 };
339 #endif // SHARE_VM_CI_CIMETHOD_HPP