Sat, 01 Sep 2012 13:25:18 -0400
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
1 /*
2 * Copyright (c) 1999, 2012, 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_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;
55 private:
56 // General method information.
57 ciFlags _flags;
58 ciSymbol* _name;
59 ciInstanceKlass* _holder;
60 ciSignature* _signature;
61 ciMethodData* _method_data;
62 ciMethodBlocks* _method_blocks;
64 // Code attributes.
65 int _code_size;
66 int _max_stack;
67 int _max_locals;
68 vmIntrinsics::ID _intrinsic_id;
69 int _handler_count;
70 int _interpreter_invocation_count;
71 int _interpreter_throwout_count;
73 bool _uses_monitors;
74 bool _balanced_monitors;
75 bool _is_c1_compilable;
76 bool _is_c2_compilable;
77 bool _can_be_statically_bound;
79 // Lazy fields, filled in on demand
80 address _code;
81 ciExceptionHandler** _exception_handlers;
83 // Optional liveness analyzer.
84 MethodLiveness* _liveness;
85 #if defined(COMPILER2) || defined(SHARK)
86 ciTypeFlow* _flow;
87 BCEscapeAnalyzer* _bcea;
88 #endif
90 ciMethod(methodHandle h_m);
91 ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature, ciInstanceKlass* accessor);
93 Method* get_Method() const {
94 Method* m = (Method*)_metadata;
95 assert(m != NULL, "illegal use of unloaded method");
96 return m;
97 }
99 oop loader() const { return _holder->loader(); }
101 const char* type_string() { return "ciMethod"; }
103 void print_impl(outputStream* st);
105 void load_code();
107 void check_is_loaded() const { assert(is_loaded(), "not loaded"); }
109 bool ensure_method_data(methodHandle h_m);
111 void code_at_put(int bci, Bytecodes::Code code) {
112 Bytecodes::check(code);
113 assert(0 <= bci && bci < code_size(), "valid bci");
114 address bcp = _code + bci;
115 *bcp = code;
116 }
118 public:
119 // Basic method information.
120 ciFlags flags() const { check_is_loaded(); return _flags; }
121 ciSymbol* name() const { return _name; }
122 ciInstanceKlass* holder() const { return _holder; }
123 ciMethodData* method_data();
124 ciMethodData* method_data_or_null();
126 // Signature information.
127 ciSignature* signature() const { return _signature; }
128 ciType* return_type() const { return _signature->return_type(); }
129 int arg_size_no_receiver() const { return _signature->size(); }
130 // Can only be used on loaded ciMethods
131 int arg_size() const {
132 check_is_loaded();
133 return _signature->size() + (_flags.is_static() ? 0 : 1);
134 }
135 // Report the number of elements on stack when invoking this method.
136 // This is different than the regular arg_size because invokedynamic
137 // has an implicit receiver.
138 int invoke_arg_size(Bytecodes::Code code) const {
139 if (is_loaded()) {
140 return arg_size();
141 } else {
142 int arg_size = _signature->size();
143 // Add a receiver argument, maybe:
144 if (code != Bytecodes::_invokestatic &&
145 code != Bytecodes::_invokedynamic) {
146 arg_size++;
147 }
148 return arg_size;
149 }
150 }
153 // Method code and related information.
154 address code() { if (_code == NULL) load_code(); return _code; }
155 int code_size() const { check_is_loaded(); return _code_size; }
156 int max_stack() const { check_is_loaded(); return _max_stack; }
157 int max_locals() const { check_is_loaded(); return _max_locals; }
158 vmIntrinsics::ID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; }
159 bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; }
160 int exception_table_length() const { check_is_loaded(); return _handler_count; }
161 int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; }
162 int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; }
164 // Code size for inlining decisions.
165 int code_size_for_inlining();
167 bool force_inline() { return get_Method()->force_inline(); }
168 bool dont_inline() { return get_Method()->dont_inline(); }
170 int comp_level();
171 int highest_osr_comp_level();
173 Bytecodes::Code java_code_at_bci(int bci) {
174 address bcp = code() + bci;
175 return Bytecodes::java_code_at(NULL, bcp);
176 }
177 BCEscapeAnalyzer *get_bcea();
178 ciMethodBlocks *get_method_blocks();
180 bool has_linenumber_table() const; // length unknown until decompression
181 u_char* compressed_linenumber_table() const; // not preserved by gc
183 int line_number_from_bci(int bci) const;
185 // Runtime information.
186 int vtable_index();
187 #ifdef SHARK
188 int itable_index();
189 #endif // SHARK
190 address native_entry();
191 address interpreter_entry();
193 // Analysis and profiling.
194 //
195 // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks.
196 bool uses_monitors() const { return _uses_monitors; } // this one should go away, it has a misleading name
197 bool has_monitor_bytecodes() const { return _uses_monitors; }
198 bool has_balanced_monitors();
200 // Returns a bitmap indicating which locals are required to be
201 // maintained as live for deopt. raw_liveness_at_bci is always the
202 // direct output of the liveness computation while liveness_at_bci
203 // may mark all locals as live to improve support for debugging Java
204 // code by maintaining the state of as many locals as possible.
205 MethodLivenessResult raw_liveness_at_bci(int bci);
206 MethodLivenessResult liveness_at_bci(int bci);
208 // Get the interpreters viewpoint on oop liveness. MethodLiveness is
209 // conservative in the sense that it may consider locals to be live which
210 // cannot be live, like in the case where a local could contain an oop or
211 // a primitive along different paths. In that case the local must be
212 // dead when those paths merge. Since the interpreter's viewpoint is
213 // used when gc'ing an interpreter frame we need to use its viewpoint
214 // during OSR when loading the locals.
216 BitMap live_local_oops_at_bci(int bci);
218 #ifdef COMPILER1
219 const BitMap bci_block_start();
220 #endif
222 ciTypeFlow* get_flow_analysis();
223 ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point
224 ciCallProfile call_profile_at_bci(int bci);
225 int interpreter_call_site_count(int bci);
227 // Given a certain calling environment, find the monomorphic target
228 // for the call. Return NULL if the call is not monomorphic in
229 // its calling environment.
230 ciMethod* find_monomorphic_target(ciInstanceKlass* caller,
231 ciInstanceKlass* callee_holder,
232 ciInstanceKlass* actual_receiver);
234 // Given a known receiver klass, find the target for the call.
235 // Return NULL if the call has no target or is abstract.
236 ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver);
238 // Find the proper vtable index to invoke this method.
239 int resolve_vtable_index(ciKlass* caller, ciKlass* receiver);
241 // Compilation directives
242 bool will_link(ciKlass* accessing_klass,
243 ciKlass* declared_method_holder,
244 Bytecodes::Code bc);
245 bool should_exclude();
246 bool should_inline();
247 bool should_not_inline();
248 bool should_print_assembly();
249 bool break_at_execute();
250 bool has_option(const char *option);
251 bool can_be_compiled();
252 bool can_be_osr_compiled(int entry_bci);
253 void set_not_compilable();
254 bool has_compiled_code();
255 int instructions_size(int comp_level = CompLevel_any);
256 void log_nmethod_identity(xmlStream* log);
257 bool is_not_reached(int bci);
258 bool was_executed_more_than(int times);
259 bool has_unloaded_classes_in_signature();
260 bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const;
261 bool check_call(int refinfo_index, bool is_static) const;
262 bool ensure_method_data(); // make sure it exists in the VM also
263 int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC
265 // JSR 292 support
266 bool is_method_handle_intrinsic() const;
267 bool is_compiled_lambda_form() const;
268 bool has_member_arg() const;
270 // What kind of ciObject is this?
271 bool is_method() const { return true; }
273 // Java access flags
274 bool is_public () const { return flags().is_public(); }
275 bool is_private () const { return flags().is_private(); }
276 bool is_protected () const { return flags().is_protected(); }
277 bool is_static () const { return flags().is_static(); }
278 bool is_final () const { return flags().is_final(); }
279 bool is_synchronized() const { return flags().is_synchronized(); }
280 bool is_native () const { return flags().is_native(); }
281 bool is_interface () const { return flags().is_interface(); }
282 bool is_abstract () const { return flags().is_abstract(); }
283 bool is_strict () const { return flags().is_strict(); }
285 // Other flags
286 bool is_empty_method() const;
287 bool is_vanilla_constructor() const;
288 bool is_final_method() const { return is_final() || holder()->is_final(); }
289 bool has_loops () const;
290 bool has_jsrs () const;
291 bool is_accessor () const;
292 bool is_initializer () const;
293 bool can_be_statically_bound() const { return _can_be_statically_bound; }
295 // Print the bytecodes of this method.
296 void print_codes_on(outputStream* st);
297 void print_codes() {
298 print_codes_on(tty);
299 }
300 void print_codes_on(int from, int to, outputStream* st);
302 // Print the name of this method in various incarnations.
303 void print_name(outputStream* st = tty);
304 void print_short_name(outputStream* st = tty);
305 };
307 #endif // SHARE_VM_CI_CIMETHOD_HPP