Mercurial > hg > truffle
annotate src/share/vm/oops/method.hpp @ 7184:5505fbbae3d3
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author | cjplummer |
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date | Thu, 29 Nov 2012 13:55:49 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP |
26 #define SHARE_VM_OOPS_METHODOOP_HPP | |
27 | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/compressedStream.hpp" | |
30 #include "compiler/oopMap.hpp" | |
31 #include "interpreter/invocationCounter.hpp" | |
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32 #include "oops/annotations.hpp" |
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33 #include "oops/constantPool.hpp" |
1972 | 34 #include "oops/instanceKlass.hpp" |
35 #include "oops/oop.hpp" | |
36 #include "oops/typeArrayOop.hpp" | |
37 #include "utilities/accessFlags.hpp" | |
38 #include "utilities/growableArray.hpp" | |
39 | |
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40 // A Method* represents a Java method. |
0 | 41 // |
42 // Memory layout (each line represents a word). Note that most applications load thousands of methods, | |
43 // so keeping the size of this structure small has a big impact on footprint. | |
44 // | |
45 // We put all oops and method_size first for better gc cache locality. | |
46 // | |
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47 // The actual bytecodes are inlined after the end of the Method struct. |
0 | 48 // |
49 // There are bits in the access_flags telling whether inlined tables are present. | |
50 // Note that accessing the line number and local variable tables is not performance critical at all. | |
51 // Accessing the checked exceptions table is used by reflection, so we put that last to make access | |
52 // to it fast. | |
53 // | |
54 // The line number table is compressed and inlined following the byte codes. It is found as the first | |
55 // byte following the byte codes. The checked exceptions table and the local variable table are inlined | |
56 // after the line number table, and indexed from the end of the method. We do not compress the checked | |
57 // exceptions table since the average length is less than 2, and do not bother to compress the local | |
58 // variable table either since it is mostly absent. | |
59 // | |
60 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) | |
61 // | |
62 // |------------------------------------------------------| | |
63 // | header | | |
64 // | klass | | |
65 // |------------------------------------------------------| | |
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66 // | ConstMethod* (oop) | |
0 | 67 // |------------------------------------------------------| |
68 // | methodData (oop) | | |
69 // | interp_invocation_count | | |
70 // |------------------------------------------------------| | |
71 // | access_flags | | |
72 // | vtable_index | | |
73 // |------------------------------------------------------| | |
74 // | result_index (C++ interpreter only) | | |
75 // |------------------------------------------------------| | |
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76 // | method_size | max_locals | |
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77 // | size_of_parameters | intrinsic_id| flags | |
0 | 78 // |------------------------------------------------------| |
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79 // | throwout_count | num_breakpoints | |
0 | 80 // |------------------------------------------------------| |
81 // | invocation_counter | | |
82 // | backedge_counter | | |
83 // |------------------------------------------------------| | |
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84 // | prev_time (tiered only, 64 bit wide) | |
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85 // | | |
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86 // |------------------------------------------------------| |
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87 // | rate (tiered) | |
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88 // |------------------------------------------------------| |
0 | 89 // | code (pointer) | |
90 // | i2i (pointer) | | |
91 // | adapter (pointer) | | |
92 // | from_compiled_entry (pointer) | | |
93 // | from_interpreted_entry (pointer) | | |
94 // |------------------------------------------------------| | |
95 // | native_function (present only if native) | | |
96 // | signature_handler (present only if native) | | |
97 // |------------------------------------------------------| | |
98 | |
99 | |
100 class CheckedExceptionElement; | |
101 class LocalVariableTableElement; | |
102 class AdapterHandlerEntry; | |
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103 class MethodData; |
6934 | 104 class ConstMethod; |
0 | 105 |
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106 class Method : public Metadata { |
0 | 107 friend class VMStructs; |
108 private: | |
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109 ConstMethod* _constMethod; // Method read-only data. |
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110 MethodData* _method_data; |
1783 | 111 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered) |
0 | 112 AccessFlags _access_flags; // Access flags |
113 int _vtable_index; // vtable index of this method (see VtableIndexFlag) | |
114 // note: can have vtables with >2**16 elements (because of inheritance) | |
115 #ifdef CC_INTERP | |
116 int _result_index; // C++ interpreter needs for converting results to/from stack | |
117 #endif | |
118 u2 _method_size; // size of this object | |
119 u2 _max_locals; // Number of local variables used by this method | |
120 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words | |
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121 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none) |
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122 u1 _jfr_towrite : 1, // Flags |
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123 _force_inline : 1, |
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124 _hidden : 1, |
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125 _dont_inline : 1, |
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126 : 4; |
0 | 127 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting |
128 u2 _number_of_breakpoints; // fullspeed debugging support | |
129 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations | |
130 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations | |
1783 | 131 |
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132 #ifdef TIERED |
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133 jlong _prev_time; // Previous time the rate was acquired |
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134 float _rate; // Events (invocation and backedge counter increments) per millisecond |
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135 #endif |
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136 |
0 | 137 #ifndef PRODUCT |
138 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) | |
139 #endif | |
140 // Entry point for calling both from and to the interpreter. | |
141 address _i2i_entry; // All-args-on-stack calling convention | |
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142 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked. |
0 | 143 AdapterHandlerEntry* _adapter; |
144 // Entry point for calling from compiled code, to compiled code if it exists | |
145 // or else the interpreter. | |
146 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() | |
147 // The entry point for calling both from and to compiled code is | |
148 // "_code->entry_point()". Because of tiered compilation and de-opt, this | |
149 // field can come and go. It can transition from NULL to not-null at any | |
150 // time (whenever a compile completes). It can transition from not-null to | |
151 // NULL only at safepoints (because of a de-opt). | |
152 nmethod* volatile _code; // Points to the corresponding piece of native code | |
153 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry | |
154 | |
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155 // Constructor |
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156 Method(ConstMethod* xconst, AccessFlags access_flags, int size); |
0 | 157 public: |
6934 | 158 |
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159 static Method* allocate(ClassLoaderData* loader_data, |
6934 | 160 int byte_code_size, |
161 AccessFlags access_flags, | |
162 int compressed_line_number_size, | |
163 int localvariable_table_length, | |
164 int exception_table_length, | |
165 int checked_exceptions_length, | |
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166 u2 generic_signature_index, |
6934 | 167 ConstMethod::MethodType method_type, |
168 TRAPS); | |
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169 |
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170 // CDS and vtbl checking can create an empty Method to get vtbl pointer. |
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171 Method(){} |
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172 |
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173 // The Method vtable is restored by this call when the Method is in the |
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174 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for |
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175 // all the gory details. SA, dtrace and pstack helpers distinguish metadata |
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176 // by their vtable. |
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177 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); } |
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178 bool is_method() const volatile { return true; } |
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179 |
0 | 180 // accessors for instance variables |
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181 |
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182 ConstMethod* constMethod() const { return _constMethod; } |
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183 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; } |
0 | 184 |
185 | |
186 static address make_adapters(methodHandle mh, TRAPS); | |
187 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } | |
188 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } | |
189 | |
190 // access flag | |
191 AccessFlags access_flags() const { return _access_flags; } | |
192 void set_access_flags(AccessFlags flags) { _access_flags = flags; } | |
193 | |
194 // name | |
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195 Symbol* name() const { return constants()->symbol_at(name_index()); } |
0 | 196 int name_index() const { return constMethod()->name_index(); } |
197 void set_name_index(int index) { constMethod()->set_name_index(index); } | |
198 | |
199 // signature | |
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200 Symbol* signature() const { return constants()->symbol_at(signature_index()); } |
0 | 201 int signature_index() const { return constMethod()->signature_index(); } |
202 void set_signature_index(int index) { constMethod()->set_signature_index(index); } | |
203 | |
204 // generics support | |
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205 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); } |
0 | 206 int generic_signature_index() const { return constMethod()->generic_signature_index(); } |
207 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } | |
208 | |
209 // annotations support | |
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210 AnnotationArray* annotations() const { |
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211 InstanceKlass* ik = method_holder(); |
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212 if (ik->annotations() == NULL) { |
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213 return NULL; |
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214 } |
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215 return ik->annotations()->get_method_annotations_of(method_idnum()); |
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216 } |
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217 AnnotationArray* parameter_annotations() const { |
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218 InstanceKlass* ik = method_holder(); |
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219 if (ik->annotations() == NULL) { |
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220 return NULL; |
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221 } |
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222 return ik->annotations()->get_method_parameter_annotations_of(method_idnum()); |
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223 } |
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224 AnnotationArray* annotation_default() const { |
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225 InstanceKlass* ik = method_holder(); |
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226 if (ik->annotations() == NULL) { |
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227 return NULL; |
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228 } |
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229 return ik->annotations()->get_method_default_annotations_of(method_idnum()); |
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230 } |
0 | 231 |
232 #ifdef CC_INTERP | |
233 void set_result_index(BasicType type); | |
234 int result_index() { return _result_index; } | |
235 #endif | |
236 | |
237 // Helper routine: get klass name + "." + method name + signature as | |
238 // C string, for the purpose of providing more useful NoSuchMethodErrors | |
239 // and fatal error handling. The string is allocated in resource | |
240 // area if a buffer is not provided by the caller. | |
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241 char* name_and_sig_as_C_string() const; |
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242 char* name_and_sig_as_C_string(char* buf, int size) const; |
0 | 243 |
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244 // Static routine in the situations we don't have a Method* |
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245 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature); |
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246 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size); |
0 | 247 |
2142 | 248 Bytecodes::Code java_code_at(int bci) const { |
249 return Bytecodes::java_code_at(this, bcp_from(bci)); | |
250 } | |
251 Bytecodes::Code code_at(int bci) const { | |
252 return Bytecodes::code_at(this, bcp_from(bci)); | |
253 } | |
254 | |
0 | 255 // JVMTI breakpoints |
2142 | 256 Bytecodes::Code orig_bytecode_at(int bci) const; |
0 | 257 void set_orig_bytecode_at(int bci, Bytecodes::Code code); |
258 void set_breakpoint(int bci); | |
259 void clear_breakpoint(int bci); | |
260 void clear_all_breakpoints(); | |
261 // Tracking number of breakpoints, for fullspeed debugging. | |
262 // Only mutated by VM thread. | |
263 u2 number_of_breakpoints() const { return _number_of_breakpoints; } | |
264 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } | |
265 void decr_number_of_breakpoints() { --_number_of_breakpoints; } | |
266 // Initialization only | |
267 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } | |
268 | |
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269 // index into InstanceKlass methods() array |
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270 // note: also used by jfr |
0 | 271 u2 method_idnum() const { return constMethod()->method_idnum(); } |
272 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } | |
273 | |
274 // code size | |
275 int code_size() const { return constMethod()->code_size(); } | |
276 | |
277 // method size | |
278 int method_size() const { return _method_size; } | |
279 void set_method_size(int size) { | |
280 assert(0 <= size && size < (1 << 16), "invalid method size"); | |
281 _method_size = size; | |
282 } | |
283 | |
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284 // constant pool for Klass* holding this method |
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285 ConstantPool* constants() const { return constMethod()->constants(); } |
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286 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); } |
0 | 287 |
288 // max stack | |
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289 // return original max stack size for method verification |
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290 int verifier_max_stack() const { return constMethod()->max_stack(); } |
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291 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); } |
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292 void set_max_stack(int size) { constMethod()->set_max_stack(size); } |
0 | 293 |
294 // max locals | |
295 int max_locals() const { return _max_locals; } | |
296 void set_max_locals(int size) { _max_locals = size; } | |
1783 | 297 |
298 int highest_comp_level() const; | |
299 void set_highest_comp_level(int level); | |
300 int highest_osr_comp_level() const; | |
301 void set_highest_osr_comp_level(int level); | |
0 | 302 |
303 // Count of times method was exited via exception while interpreting | |
304 void interpreter_throwout_increment() { | |
305 if (_interpreter_throwout_count < 65534) { | |
306 _interpreter_throwout_count++; | |
307 } | |
308 } | |
309 | |
310 int interpreter_throwout_count() const { return _interpreter_throwout_count; } | |
311 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } | |
312 | |
313 // size of parameters | |
314 int size_of_parameters() const { return _size_of_parameters; } | |
315 | |
316 bool has_stackmap_table() const { | |
317 return constMethod()->has_stackmap_table(); | |
318 } | |
319 | |
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320 Array<u1>* stackmap_data() const { |
0 | 321 return constMethod()->stackmap_data(); |
322 } | |
323 | |
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324 void set_stackmap_data(Array<u1>* sd) { |
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325 constMethod()->set_stackmap_data(sd); |
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326 } |
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327 |
0 | 328 // exception handler table |
329 bool has_exception_handler() const | |
330 { return constMethod()->has_exception_handler(); } | |
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331 int exception_table_length() const |
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332 { return constMethod()->exception_table_length(); } |
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333 ExceptionTableElement* exception_table_start() const |
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334 { return constMethod()->exception_table_start(); } |
0 | 335 |
336 // Finds the first entry point bci of an exception handler for an | |
337 // exception of klass ex_klass thrown at throw_bci. A value of NULL | |
338 // for ex_klass indicates that the exception klass is not known; in | |
339 // this case it matches any constraint class. Returns -1 if the | |
340 // exception cannot be handled in this method. The handler | |
341 // constraint classes are loaded if necessary. Note that this may | |
342 // throw an exception if loading of the constraint classes causes | |
343 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. | |
344 // If an exception is thrown, returns the bci of the | |
345 // exception handler which caused the exception to be thrown, which | |
346 // is needed for proper retries. See, for example, | |
347 // InterpreterRuntime::exception_handler_for_exception. | |
348 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); | |
349 | |
350 // method data access | |
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351 MethodData* method_data() const { |
0 | 352 return _method_data; |
353 } | |
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354 void set_method_data(MethodData* data) { |
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355 _method_data = data; |
0 | 356 } |
357 | |
358 // invocation counter | |
1783 | 359 InvocationCounter* invocation_counter() { return &_invocation_counter; } |
360 InvocationCounter* backedge_counter() { return &_backedge_counter; } | |
361 | |
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362 #ifdef TIERED |
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363 // We are reusing interpreter_invocation_count as a holder for the previous event count! |
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364 // We can do that since interpreter_invocation_count is not used in tiered. |
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365 int prev_event_count() const { return _interpreter_invocation_count; } |
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366 void set_prev_event_count(int count) { _interpreter_invocation_count = count; } |
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367 jlong prev_time() const { return _prev_time; } |
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368 void set_prev_time(jlong time) { _prev_time = time; } |
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369 float rate() const { return _rate; } |
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370 void set_rate(float rate) { _rate = rate; } |
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371 #endif |
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372 |
1783 | 373 int invocation_count(); |
374 int backedge_count(); | |
375 | |
376 bool was_executed_more_than(int n); | |
377 bool was_never_executed() { return !was_executed_more_than(0); } | |
0 | 378 |
379 static void build_interpreter_method_data(methodHandle method, TRAPS); | |
380 | |
1783 | 381 int interpreter_invocation_count() { |
382 if (TieredCompilation) return invocation_count(); | |
383 else return _interpreter_invocation_count; | |
384 } | |
0 | 385 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } |
1783 | 386 int increment_interpreter_invocation_count() { |
387 if (TieredCompilation) ShouldNotReachHere(); | |
388 return ++_interpreter_invocation_count; | |
389 } | |
0 | 390 |
391 #ifndef PRODUCT | |
1783 | 392 int compiled_invocation_count() const { return _compiled_invocation_count; } |
0 | 393 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } |
394 #endif // not PRODUCT | |
395 | |
605 | 396 // Clear (non-shared space) pointers which could not be relevant |
0 | 397 // if this (shared) method were mapped into another JVM. |
398 void remove_unshareable_info(); | |
399 | |
400 // nmethod/verified compiler entry | |
401 address verified_code_entry(); | |
402 bool check_code() const; // Not inline to avoid circular ref | |
403 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } | |
404 void clear_code(); // Clear out any compiled code | |
1202 | 405 static void set_code(methodHandle mh, nmethod* code); |
0 | 406 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } |
407 address get_i2c_entry(); | |
408 address get_c2i_entry(); | |
409 address get_c2i_unverified_entry(); | |
410 AdapterHandlerEntry* adapter() { return _adapter; } | |
411 // setup entry points | |
412 void link_method(methodHandle method, TRAPS); | |
413 // clear entry points. Used by sharing code | |
414 void unlink_method(); | |
415 | |
416 // vtable index | |
417 enum VtableIndexFlag { | |
418 // Valid vtable indexes are non-negative (>= 0). | |
419 // These few negative values are used as sentinels. | |
710 | 420 highest_unused_vtable_index_value = -5, |
0 | 421 invalid_vtable_index = -4, // distinct from any valid vtable index |
422 garbage_vtable_index = -3, // not yet linked; no vtable layout yet | |
423 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch | |
424 // 6330203 Note: Do not use -1, which was overloaded with many meanings. | |
425 }; | |
426 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) | |
427 int vtable_index() const { assert(valid_vtable_index(), ""); | |
428 return _vtable_index; } | |
429 void set_vtable_index(int index) { _vtable_index = index; } | |
430 | |
431 // interpreter entry | |
432 address interpreter_entry() const { return _i2i_entry; } | |
433 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry | |
434 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } | |
435 int interpreter_kind(void) { | |
436 return constMethod()->interpreter_kind(); | |
437 } | |
438 void set_interpreter_kind(); | |
439 void set_interpreter_kind(int kind) { | |
440 constMethod()->set_interpreter_kind(kind); | |
441 } | |
442 | |
443 // native function (used for native methods only) | |
444 enum { | |
445 native_bind_event_is_interesting = true | |
446 }; | |
447 address native_function() const { return *(native_function_addr()); } | |
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448 address critical_native_function(); |
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449 |
0 | 450 // Must specify a real function (not NULL). |
451 // Use clear_native_function() to unregister. | |
452 void set_native_function(address function, bool post_event_flag); | |
453 bool has_native_function() const; | |
454 void clear_native_function(); | |
455 | |
456 // signature handler (used for native methods only) | |
457 address signature_handler() const { return *(signature_handler_addr()); } | |
458 void set_signature_handler(address handler); | |
459 | |
460 // Interpreter oopmap support | |
461 void mask_for(int bci, InterpreterOopMap* mask); | |
462 | |
463 #ifndef PRODUCT | |
464 // operations on invocation counter | |
1783 | 465 void print_invocation_count(); |
0 | 466 #endif |
467 | |
468 // byte codes | |
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469 void set_code(address code) { return constMethod()->set_code(code); } |
0 | 470 address code_base() const { return constMethod()->code_base(); } |
471 bool contains(address bcp) const { return constMethod()->contains(bcp); } | |
472 | |
473 // prints byte codes | |
474 void print_codes() const { print_codes_on(tty); } | |
475 void print_codes_on(outputStream* st) const PRODUCT_RETURN; | |
476 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; | |
477 | |
478 // checked exceptions | |
479 int checked_exceptions_length() const | |
480 { return constMethod()->checked_exceptions_length(); } | |
481 CheckedExceptionElement* checked_exceptions_start() const | |
482 { return constMethod()->checked_exceptions_start(); } | |
483 | |
484 // localvariable table | |
485 bool has_localvariable_table() const | |
486 { return constMethod()->has_localvariable_table(); } | |
487 int localvariable_table_length() const | |
488 { return constMethod()->localvariable_table_length(); } | |
489 LocalVariableTableElement* localvariable_table_start() const | |
490 { return constMethod()->localvariable_table_start(); } | |
491 | |
492 bool has_linenumber_table() const | |
493 { return constMethod()->has_linenumber_table(); } | |
494 u_char* compressed_linenumber_table() const | |
495 { return constMethod()->compressed_linenumber_table(); } | |
496 | |
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497 // method holder (the Klass* holding this method) |
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498 InstanceKlass* method_holder() const { return constants()->pool_holder(); } |
0 | 499 |
500 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) | |
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501 Symbol* klass_name() const; // returns the name of the method holder |
0 | 502 BasicType result_type() const; // type of the method result |
503 int result_type_index() const; // type index of the method result | |
504 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } | |
505 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } | |
506 | |
507 // Checked exceptions thrown by this method (resolved to mirrors) | |
508 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } | |
509 | |
510 // Access flags | |
511 bool is_public() const { return access_flags().is_public(); } | |
512 bool is_private() const { return access_flags().is_private(); } | |
513 bool is_protected() const { return access_flags().is_protected(); } | |
514 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } | |
515 bool is_static() const { return access_flags().is_static(); } | |
516 bool is_final() const { return access_flags().is_final(); } | |
517 bool is_synchronized() const { return access_flags().is_synchronized();} | |
518 bool is_native() const { return access_flags().is_native(); } | |
519 bool is_abstract() const { return access_flags().is_abstract(); } | |
520 bool is_strict() const { return access_flags().is_strict(); } | |
521 bool is_synthetic() const { return access_flags().is_synthetic(); } | |
522 | |
523 // returns true if contains only return operation | |
524 bool is_empty_method() const; | |
525 | |
526 // returns true if this is a vanilla constructor | |
527 bool is_vanilla_constructor() const; | |
528 | |
529 // checks method and its method holder | |
530 bool is_final_method() const; | |
531 bool is_strict_method() const; | |
532 | |
533 // true if method needs no dynamic dispatch (final and/or no vtable entry) | |
534 bool can_be_statically_bound() const; | |
535 | |
536 // returns true if the method has any backward branches. | |
537 bool has_loops() { | |
538 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); | |
539 }; | |
540 | |
541 bool compute_has_loops_flag(); | |
542 | |
543 bool has_jsrs() { | |
544 return access_flags().has_jsrs(); | |
545 }; | |
546 void set_has_jsrs() { | |
547 _access_flags.set_has_jsrs(); | |
548 } | |
549 | |
550 // returns true if the method has any monitors. | |
551 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } | |
552 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } | |
553 | |
554 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } | |
555 | |
556 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes | |
557 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. | |
558 // has not been computed yet. | |
559 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } | |
560 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } | |
561 | |
562 // returns true if the method is an accessor function (setter/getter). | |
563 bool is_accessor() const; | |
564 | |
565 // returns true if the method is an initializer (<init> or <clinit>). | |
566 bool is_initializer() const; | |
567 | |
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568 // returns true if the method is static OR if the classfile version < 51 |
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569 bool has_valid_initializer_flags() const; |
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570 |
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571 // returns true if the method name is <clinit> and the method has |
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572 // valid static initializer flags. |
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573 bool is_static_initializer() const; |
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574 |
0 | 575 // compiled code support |
576 // NOTE: code() is inherently racy as deopt can be clearing code | |
577 // simultaneously. Use with caution. | |
578 bool has_compiled_code() const { return code() != NULL; } | |
579 | |
580 // sizing | |
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581 static int header_size() { return sizeof(Method)/HeapWordSize; } |
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582 static int size(bool is_native); |
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583 int size() const { return method_size(); } |
0 | 584 |
585 // interpreter support | |
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586 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); } |
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587 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); } |
0 | 588 #ifdef CC_INTERP |
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589 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); } |
0 | 590 #endif /* CC_INTERP */ |
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591 static ByteSize size_of_locals_offset() { return byte_offset_of(Method, _max_locals ); } |
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592 static ByteSize size_of_parameters_offset() { return byte_offset_of(Method, _size_of_parameters); } |
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593 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); } |
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594 static ByteSize code_offset() { return byte_offset_of(Method, _code); } |
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595 static ByteSize invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); } |
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596 static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); } |
0 | 597 static ByteSize method_data_offset() { |
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598 return byte_offset_of(Method, _method_data); |
0 | 599 } |
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600 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); } |
0 | 601 #ifndef PRODUCT |
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602 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); } |
0 | 603 #endif // not PRODUCT |
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604 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); } |
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605 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); } |
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606 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); } |
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607 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); } |
0 | 608 |
609 // for code generation | |
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610 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); } |
0 | 611 static int interpreter_invocation_counter_offset_in_bytes() |
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612 { return offset_of(Method, _interpreter_invocation_count); } |
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613 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); } |
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614 static int intrinsic_id_size_in_bytes() { return sizeof(u1); } |
0 | 615 |
616 // Static methods that are used to implement member methods where an exposed this pointer | |
617 // is needed due to possible GCs | |
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618 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS); |
0 | 619 |
620 // Returns the byte code index from the byte code pointer | |
621 int bci_from(address bcp) const; | |
622 address bcp_from(int bci) const; | |
623 int validate_bci_from_bcx(intptr_t bcx) const; | |
624 | |
625 // Returns the line number for a bci if debugging information for the method is prowided, | |
626 // -1 is returned otherwise. | |
627 int line_number_from_bci(int bci) const; | |
628 | |
629 // Reflection support | |
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630 bool is_overridden_in(Klass* k) const; |
0 | 631 |
710 | 632 // JSR 292 support |
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633 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id) |
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634 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm |
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635 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc. |
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636 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual |
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637 Symbol* signature, //anything at all |
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638 TRAPS); |
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639 static Klass* check_non_bcp_klass(Klass* klass); |
710 | 640 // these operate only on invoke methods: |
641 // presize interpreter frames for extra interpreter stack entries, if needed | |
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642 // method handles want to be able to push a few extra values (e.g., a bound receiver), and |
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643 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist, |
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644 // all without checking for a stack overflow |
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645 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; } |
710 | 646 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize() |
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647 |
0 | 648 // RedefineClasses() support: |
649 bool is_old() const { return access_flags().is_old(); } | |
650 void set_is_old() { _access_flags.set_is_old(); } | |
651 bool is_obsolete() const { return access_flags().is_obsolete(); } | |
652 void set_is_obsolete() { _access_flags.set_is_obsolete(); } | |
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653 bool on_stack() const { return access_flags().on_stack(); } |
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654 void set_on_stack(const bool value); |
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655 |
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656 // see the definition in Method*.cpp for the gory details |
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657 bool should_not_be_cached() const; |
0 | 658 |
659 // JVMTI Native method prefixing support: | |
660 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } | |
661 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } | |
662 | |
663 // Rewriting support | |
664 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, | |
665 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); | |
666 | |
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667 // jmethodID handling |
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668 // Because the useful life-span of a jmethodID cannot be determined, |
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669 // once created they are never reclaimed. The methods to which they refer, |
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670 // however, can be GC'ed away if the class is unloaded or if the method is |
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671 // made obsolete or deleted -- in these cases, the jmethodID |
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672 // refers to NULL (as is the case for any weak reference). |
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673 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh); |
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674 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid); |
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675 |
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676 // Use resolve_jmethod_id() in situations where the caller is expected |
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677 // to provide a valid jmethodID; the only sanity checks are in asserts; |
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678 // result guaranteed not to be NULL. |
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679 inline static Method* resolve_jmethod_id(jmethodID mid) { |
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680 assert(mid != NULL, "JNI method id should not be null"); |
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681 return *((Method**)mid); |
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682 } |
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683 |
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684 // Use checked_resolve_jmethod_id() in situations where the caller |
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685 // should provide a valid jmethodID, but might not. NULL is returned |
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686 // when the jmethodID does not refer to a valid method. |
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687 static Method* checked_resolve_jmethod_id(jmethodID mid); |
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688 |
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689 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method); |
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690 static bool is_method_id(jmethodID mid); |
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691 |
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692 // Clear methods |
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693 static void clear_jmethod_ids(ClassLoaderData* loader_data); |
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694 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN; |
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695 |
0 | 696 // Get this method's jmethodID -- allocate if it doesn't exist |
697 jmethodID jmethod_id() { methodHandle this_h(this); | |
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698 return InstanceKlass::get_jmethod_id(method_holder(), this_h); } |
0 | 699 |
700 // Lookup the jmethodID for this method. Return NULL if not found. | |
701 // NOTE that this function can be called from a signal handler | |
702 // (see AsyncGetCallTrace support for Forte Analyzer) and this | |
703 // needs to be async-safe. No allocation should be done and | |
704 // so handles are not used to avoid deadlock. | |
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705 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); } |
0 | 706 |
707 // JNI static invoke cached itable index accessors | |
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708 int cached_itable_index() { return method_holder()->cached_itable_index(method_idnum()); } |
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709 void set_cached_itable_index(int index) { method_holder()->set_cached_itable_index(method_idnum(), index); } |
0 | 710 |
711 // Support for inlining of intrinsic methods | |
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712 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; } |
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713 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; } |
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714 |
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715 // Helper routines for intrinsic_id() and vmIntrinsics::method(). |
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716 void init_intrinsic_id(); // updates from _none if a match |
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717 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder); |
0 | 718 |
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719 bool jfr_towrite() { return _jfr_towrite; } |
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720 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; } |
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721 |
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722 bool force_inline() { return _force_inline; } |
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723 void set_force_inline(bool x) { _force_inline = x; } |
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724 bool dont_inline() { return _dont_inline; } |
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725 void set_dont_inline(bool x) { _dont_inline = x; } |
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726 bool is_hidden() { return _hidden; } |
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727 void set_hidden(bool x) { _hidden = x; } |
6934 | 728 ConstMethod::MethodType method_type() const { |
729 return _constMethod->method_type(); | |
730 } | |
731 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; } | |
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732 |
0 | 733 // On-stack replacement support |
1783 | 734 bool has_osr_nmethod(int level, bool match_level) { |
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735 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL; |
1783 | 736 } |
737 | |
738 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) { | |
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739 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level); |
1783 | 740 } |
0 | 741 |
742 // Inline cache support | |
743 void cleanup_inline_caches(); | |
744 | |
745 // Find if klass for method is loaded | |
746 bool is_klass_loaded_by_klass_index(int klass_index) const; | |
747 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; | |
748 | |
749 // Indicates whether compilation failed earlier for this method, or | |
750 // whether it is not compilable for another reason like having a | |
751 // breakpoint set in it. | |
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752 bool is_not_compilable(int comp_level = CompLevel_any) const; |
1783 | 753 void set_not_compilable(int comp_level = CompLevel_all, bool report = true); |
754 void set_not_compilable_quietly(int comp_level = CompLevel_all) { | |
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755 set_not_compilable(comp_level, false); |
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756 } |
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757 bool is_not_osr_compilable(int comp_level = CompLevel_any) const; |
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758 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true); |
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759 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) { |
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760 set_not_osr_compilable(comp_level, false); |
1783 | 761 } |
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762 |
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763 private: |
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764 void print_made_not_compilable(int comp_level, bool is_osr, bool report); |
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765 |
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766 public: |
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767 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); } |
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768 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); } |
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769 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); } |
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770 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); } |
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771 |
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772 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit |
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773 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit |
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774 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); } |
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775 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); } |
0 | 776 |
777 // Background compilation support | |
1783 | 778 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } |
779 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } | |
780 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } | |
0 | 781 |
782 // Resolve all classes in signature, return 'true' if successful | |
783 static bool load_signature_classes(methodHandle m, TRAPS); | |
784 | |
785 // Return if true if not all classes references in signature, including return type, has been loaded | |
786 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); | |
787 | |
788 // Printing | |
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789 void print_short_name(outputStream* st = tty) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM |
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790 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)" |
0 | 791 |
792 // Helper routine used for method sorting | |
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793 static void sort_methods(Array<Method*>* methods, |
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794 Array<AnnotationArray*>* methods_annotations, |
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795 Array<AnnotationArray*>* methods_parameter_annotations, |
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796 Array<AnnotationArray*>* methods_default_annotations, |
0 | 797 bool idempotent = false); |
798 | |
799 // size of parameters | |
800 void set_size_of_parameters(int size) { _size_of_parameters = size; } | |
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801 |
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802 // Deallocation function for redefine classes or if an error occurs |
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803 void deallocate_contents(ClassLoaderData* loader_data); |
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804 |
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805 // Printing |
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806 #ifndef PRODUCT |
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807 void print_on(outputStream* st) const; |
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808 #endif |
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809 void print_value_on(outputStream* st) const; |
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810 |
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811 const char* internal_name() const { return "{method}"; } |
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812 |
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813 // Check for valid method pointer |
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814 bool is_valid_method() const; |
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815 |
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816 // Verify |
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817 void verify() { verify_on(tty); } |
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818 void verify_on(outputStream* st); |
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819 |
0 | 820 private: |
821 | |
822 // Inlined elements | |
823 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } | |
824 address* signature_handler_addr() const { return native_function_addr() + 1; } | |
825 }; | |
826 | |
827 | |
828 // Utility class for compressing line number tables | |
829 | |
830 class CompressedLineNumberWriteStream: public CompressedWriteStream { | |
831 private: | |
832 int _bci; | |
833 int _line; | |
834 public: | |
835 // Constructor | |
836 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} | |
837 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} | |
838 | |
839 // Write (bci, line number) pair to stream | |
840 void write_pair_regular(int bci_delta, int line_delta); | |
841 | |
842 inline void write_pair_inline(int bci, int line) { | |
843 int bci_delta = bci - _bci; | |
844 int line_delta = line - _line; | |
845 _bci = bci; | |
846 _line = line; | |
847 // Skip (0,0) deltas - they do not add information and conflict with terminator. | |
848 if (bci_delta == 0 && line_delta == 0) return; | |
849 // Check if bci is 5-bit and line number 3-bit unsigned. | |
850 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { | |
851 // Compress into single byte. | |
852 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; | |
853 // Check that value doesn't match escape character. | |
854 if (value != 0xFF) { | |
855 write_byte(value); | |
856 return; | |
857 } | |
858 } | |
859 write_pair_regular(bci_delta, line_delta); | |
860 } | |
861 | |
862 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. | |
863 // Disabling optimization doesn't work for methods in header files | |
864 // so we force it to call through the non-optimized version in the .cpp. | |
865 // It's gross, but it's the only way we can ensure that all callers are | |
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866 // fixed. _MSC_VER is defined by the windows compiler |
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867 #if defined(_M_AMD64) && _MSC_VER >= 1400 |
0 | 868 void write_pair(int bci, int line); |
869 #else | |
870 void write_pair(int bci, int line) { write_pair_inline(bci, line); } | |
871 #endif | |
872 | |
873 // Write end-of-stream marker | |
874 void write_terminator() { write_byte(0); } | |
875 }; | |
876 | |
877 | |
878 // Utility class for decompressing line number tables | |
879 | |
880 class CompressedLineNumberReadStream: public CompressedReadStream { | |
881 private: | |
882 int _bci; | |
883 int _line; | |
884 public: | |
885 // Constructor | |
886 CompressedLineNumberReadStream(u_char* buffer); | |
887 // Read (bci, line number) pair from stream. Returns false at end-of-stream. | |
888 bool read_pair(); | |
889 // Accessing bci and line number (after calling read_pair) | |
890 int bci() const { return _bci; } | |
891 int line() const { return _line; } | |
892 }; | |
893 | |
894 | |
895 /// Fast Breakpoints. | |
896 | |
897 // If this structure gets more complicated (because bpts get numerous), | |
898 // move it into its own header. | |
899 | |
900 // There is presently no provision for concurrent access | |
901 // to breakpoint lists, which is only OK for JVMTI because | |
902 // breakpoints are written only at safepoints, and are read | |
903 // concurrently only outside of safepoints. | |
904 | |
6197 | 905 class BreakpointInfo : public CHeapObj<mtClass> { |
0 | 906 friend class VMStructs; |
907 private: | |
908 Bytecodes::Code _orig_bytecode; | |
909 int _bci; | |
910 u2 _name_index; // of method | |
911 u2 _signature_index; // of method | |
912 BreakpointInfo* _next; // simple storage allocation | |
913 | |
914 public: | |
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915 BreakpointInfo(Method* m, int bci); |
0 | 916 |
917 // accessors | |
918 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } | |
919 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } | |
920 int bci() { return _bci; } | |
921 | |
922 BreakpointInfo* next() const { return _next; } | |
923 void set_next(BreakpointInfo* n) { _next = n; } | |
924 | |
925 // helps for searchers | |
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926 bool match(const Method* m, int bci) { |
0 | 927 return bci == _bci && match(m); |
928 } | |
929 | |
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930 bool match(const Method* m) { |
0 | 931 return _name_index == m->name_index() && |
932 _signature_index == m->signature_index(); | |
933 } | |
934 | |
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935 void set(Method* method); |
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936 void clear(Method* method); |
0 | 937 }; |
1972 | 938 |
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939 // Utility class for access exception handlers |
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940 class ExceptionTable : public StackObj { |
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941 private: |
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942 ExceptionTableElement* _table; |
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943 u2 _length; |
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944 |
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945 public: |
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946 ExceptionTable(Method* m) { |
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947 if (m->has_exception_handler()) { |
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948 _table = m->exception_table_start(); |
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949 _length = m->exception_table_length(); |
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950 } else { |
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951 _table = NULL; |
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952 _length = 0; |
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953 } |
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954 } |
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955 |
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956 int length() const { |
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957 return _length; |
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958 } |
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959 |
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960 u2 start_pc(int idx) const { |
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961 assert(idx < _length, "out of bounds"); |
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962 return _table[idx].start_pc; |
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963 } |
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964 |
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965 void set_start_pc(int idx, u2 value) { |
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966 assert(idx < _length, "out of bounds"); |
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967 _table[idx].start_pc = value; |
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968 } |
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969 |
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970 u2 end_pc(int idx) const { |
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971 assert(idx < _length, "out of bounds"); |
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972 return _table[idx].end_pc; |
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973 } |
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974 |
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975 void set_end_pc(int idx, u2 value) { |
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976 assert(idx < _length, "out of bounds"); |
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977 _table[idx].end_pc = value; |
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978 } |
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979 |
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980 u2 handler_pc(int idx) const { |
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981 assert(idx < _length, "out of bounds"); |
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982 return _table[idx].handler_pc; |
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983 } |
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984 |
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985 void set_handler_pc(int idx, u2 value) { |
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986 assert(idx < _length, "out of bounds"); |
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987 _table[idx].handler_pc = value; |
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988 } |
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989 |
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990 u2 catch_type_index(int idx) const { |
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991 assert(idx < _length, "out of bounds"); |
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992 return _table[idx].catch_type_index; |
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993 } |
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994 |
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995 void set_catch_type_index(int idx, u2 value) { |
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996 assert(idx < _length, "out of bounds"); |
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997 _table[idx].catch_type_index = value; |
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998 } |
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999 }; |
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1000 |
1972 | 1001 #endif // SHARE_VM_OOPS_METHODOOP_HPP |