32 #include "runtime/handles.hpp"
33 #include "utilities/align.hpp"
34 #include "utilities/constantTag.hpp"
35 #include "utilities/growableArray.hpp"
36
37 // The ConstantPoolCache is not a cache! It is the resolution table that the
38 // interpreter uses to avoid going into the runtime and a way to access resolved
39 // values.
40
41 // A ConstantPoolCacheEntry describes an individual entry of the constant
42 // pool cache. There's 2 principal kinds of entries: field entries for in-
43 // stance & static field access, and method entries for invokes. Some of
44 // the entry layout is shared and looks as follows:
45 //
46 // bit number |31 0|
47 // bit length |-8--|-8--|---16----|
48 // --------------------------------
49 // _indices [ b2 | b1 | index ] index = constant_pool_index
50 // _f1 [ entry specific ] metadata ptr (method or klass)
51 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr
52 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries)
53 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |1 |-3-|----16-----]
54 // _flags [tos|0|F=0|S|A|I|f|0|vf|indy_rf|000|00000|psize] (for method entries)
55 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--]
56
57 // --------------------------------
58 //
59 // with:
60 // index = original constant pool index
61 // b1 = bytecode 1
62 // b2 = bytecode 2
63 // psize = parameters size (method entries only)
64 // field_index = index into field information in holder InstanceKlass
65 // The index max is 0xffff (max number of fields in constant pool)
66 // and is multiplied by (InstanceKlass::next_offset) when accessing.
67 // tos = TosState
68 // F = the entry is for a field (or F=0 for a method)
69 // A = call site has an appendix argument (loaded from resolved references)
70 // I = interface call is forced virtual (must use a vtable index or vfinal)
71 // f = field or method is final
72 // v = field is volatile
73 // vf = virtual but final (method entries only: is_vfinal())
74 // indy_rf = call site specifier method resolution failed
75 //
76 // The flags after TosState have the following interpretation:
77 // bit 27: 0 for fields, 1 for methods
78 // f flag true if field is marked final
79 // v flag true if field is volatile (only for fields)
80 // f2 flag true if f2 contains an oop (e.g., virtual final method)
81 // fv flag true if invokeinterface used for method in class Object
82 //
83 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 16 with the
84 // following mapping to the TosState states:
85 //
86 // btos: 0
87 // ztos: 1
88 // ctos: 2
89 // stos: 3
90 // itos: 4
91 // ltos: 5
92 // ftos: 6
93 // dtos: 7
94 // atos: 8
95 // vtos: 9
96 //
97 // Entry specific: field entries:
165 assert((field_index & field_index_mask) == field_index, "field_index in range");
166 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
167 }
168 void set_method_flags(TosState return_type, int option_bits, int method_params) {
169 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
170 set_flags(make_flags(return_type, option_bits, method_params));
171 }
172
173 public:
174 // specific bit definitions for the flags field:
175 // (Note: the interpreter must use these definitions to access the CP cache.)
176 enum {
177 // high order bits are the TosState corresponding to field type or method return type
178 tos_state_bits = 4,
179 tos_state_mask = right_n_bits(tos_state_bits),
180 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
181 // misc. option bits; can be any bit position in [16..27]
182 is_field_entry_shift = 26, // (F) is it a field or a method?
183 has_local_signature_shift = 25, // (S) does the call site have a per-site signature (sig-poly methods)?
184 has_appendix_shift = 24, // (A) does the call site have an appendix argument?
185 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode?
186 is_final_shift = 22, // (f) is the field or method final?
187 is_volatile_shift = 21, // (v) is the field volatile?
188 is_vfinal_shift = 20, // (vf) did the call resolve to a final method?
189 indy_resolution_failed_shift= 19, // (indy_rf) did call site specifier resolution fail ?
190 // low order bits give field index (for FieldInfo) or method parameter size:
191 field_index_bits = 16,
192 field_index_mask = right_n_bits(field_index_bits),
193 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
194 parameter_size_mask = right_n_bits(parameter_size_bits),
195 option_bits_mask = ~(((~0u) << tos_state_shift) | (field_index_mask | parameter_size_mask))
196 };
197
198 // specific bit definitions for the indices field:
199 enum {
200 cp_index_bits = 2*BitsPerByte,
201 cp_index_mask = right_n_bits(cp_index_bits),
202 bytecode_1_shift = cp_index_bits,
203 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF
204 bytecode_2_shift = cp_index_bits + BitsPerByte,
205 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF
206 };
207
208
209 // Initialization
210 void initialize_entry(int original_index); // initialize primary entry
211 void initialize_resolved_reference_index(int ref_index) {
212 assert(_f2 == 0, "set once"); // note: ref_index might be zero also
213 _f2 = ref_index;
214 }
215
216 void set_field( // sets entry to resolved field state
217 Bytecodes::Code get_code, // the bytecode used for reading the field
218 Bytecodes::Code put_code, // the bytecode used for writing the field
219 Klass* field_holder, // the object/klass holding the field
220 int orig_field_index, // the original field index in the field holder
221 int field_offset, // the field offset in words in the field holder
222 TosState field_type, // the (machine) field type
223 bool is_final, // the field is final
224 bool is_volatile // the field is volatile
225 );
226
227 private:
228 void set_direct_or_vtable_call(
229 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
230 const methodHandle& method, // the method/prototype if any (NULL, otherwise)
231 int vtable_index, // the vtable index if any, else negative
232 bool sender_is_interface
233 );
234
235 public:
236 void set_direct_call( // sets entry to exact concrete method entry
237 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
238 const methodHandle& method, // the method to call
239 bool sender_is_interface
240 );
241
242 void set_vtable_call( // sets entry to vtable index
243 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
244 const methodHandle& method, // resolved method which declares the vtable index
293 // invokedynamic and invokehandle call sites have an "appendix" item in the
294 // resolved references array.
295 Method* method_if_resolved(const constantPoolHandle& cpool);
296 oop appendix_if_resolved(const constantPoolHandle& cpool);
297
298 void set_parameter_size(int value);
299
300 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
301 // Returns -1 if neither is valid.
302 static int bytecode_number(Bytecodes::Code code) {
303 switch (code) {
304 case Bytecodes::_getstatic : // fall through
305 case Bytecodes::_getfield : // fall through
306 case Bytecodes::_invokespecial : // fall through
307 case Bytecodes::_invokestatic : // fall through
308 case Bytecodes::_invokehandle : // fall through
309 case Bytecodes::_invokedynamic : // fall through
310 case Bytecodes::_invokeinterface : return 1;
311 case Bytecodes::_putstatic : // fall through
312 case Bytecodes::_putfield : // fall through
313 case Bytecodes::_invokevirtual : return 2;
314 default : break;
315 }
316 return -1;
317 }
318
319 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
320 bool is_resolved(Bytecodes::Code code) const;
321
322 // Accessors
323 int indices() const { return _indices; }
324 int indices_ord() const;
325 int constant_pool_index() const { return (indices() & cp_index_mask); }
326 Bytecodes::Code bytecode_1() const;
327 Bytecodes::Code bytecode_2() const;
328 Metadata* f1_ord() const;
329 Method* f1_as_method() const;
330 Klass* f1_as_klass() const;
331 // Use the accessor f1() to acquire _f1's value. This is needed for
332 // example in BytecodeInterpreter::run(), where is_f1_null() is
333 // called to check if an invokedynamic call is resolved. This load
334 // of _f1 must be ordered with the loads performed by
335 // cache->main_entry_index().
336 bool is_f1_null() const; // classifies a CPC entry as unbound
337 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; }
338 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; }
339 Method* f2_as_interface_method() const;
340 intx flags_ord() const;
341 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); }
342 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
343 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; }
344 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; }
345 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
346 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; }
347 bool indy_resolution_failed() const;
348 bool has_appendix() const;
349 bool has_local_signature() const;
350 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; }
351 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; }
352 bool is_long() const { return flag_state() == ltos; }
353 bool is_double() const { return flag_state() == dtos; }
354 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
355 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
356 void set_indy_resolution_failed();
357
358 // Code generation support
359 static WordSize size() {
360 return in_WordSize(align_up((int)sizeof(ConstantPoolCacheEntry), wordSize) / wordSize);
361 }
362 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
363 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
364 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
365 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
366 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
367
368 #if INCLUDE_JVMTI
369 // RedefineClasses() API support:
370 // If this ConstantPoolCacheEntry refers to old_method then update it
371 // to refer to new_method.
372 // trace_name_printed is set to true if the current call has
373 // printed the klass name so that other routines in the adjust_*
|
32 #include "runtime/handles.hpp"
33 #include "utilities/align.hpp"
34 #include "utilities/constantTag.hpp"
35 #include "utilities/growableArray.hpp"
36
37 // The ConstantPoolCache is not a cache! It is the resolution table that the
38 // interpreter uses to avoid going into the runtime and a way to access resolved
39 // values.
40
41 // A ConstantPoolCacheEntry describes an individual entry of the constant
42 // pool cache. There's 2 principal kinds of entries: field entries for in-
43 // stance & static field access, and method entries for invokes. Some of
44 // the entry layout is shared and looks as follows:
45 //
46 // bit number |31 0|
47 // bit length |-8--|-8--|---16----|
48 // --------------------------------
49 // _indices [ b2 | b1 | index ] index = constant_pool_index
50 // _f1 [ entry specific ] metadata ptr (method or klass)
51 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr
52 // _flags [tos|0|F=1|0|I|i|f|v|0 |0000|field_index] (for field entries)
53 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |1 |-3-|----16-----]
54 // _flags [tos|0|F=0|S|A|I|f|0|vf|indy_rf|000|00000|psize] (for method entries)
55 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--]
56
57 // --------------------------------
58 //
59 // with:
60 // index = original constant pool index
61 // b1 = bytecode 1
62 // b2 = bytecode 2
63 // psize = parameters size (method entries only)
64 // field_index = index into field information in holder InstanceKlass
65 // The index max is 0xffff (max number of fields in constant pool)
66 // and is multiplied by (InstanceKlass::next_offset) when accessing.
67 // tos = TosState
68 // F = the entry is for a field (or F=0 for a method)
69 // A = call site has an appendix argument (loaded from resolved references)
70 // I = interface call is forced virtual (must use a vtable index or vfinal)
71 // f = field or method is final
72 // v = field is volatile
73 // vf = virtual but final (method entries only: is_vfinal())
74 // indy_rf = call site specifier method resolution failed
75 //
76 // The flags after TosState have the following interpretation:
77 // bit 27: 0 for fields, 1 for methods
78 // I flag true if field is a null free inline type (must never be null)
79 // i flag true if field is inlined
80 // f flag true if field is marked final
81 // v flag true if field is volatile (only for fields)
82 // f2 flag true if f2 contains an oop (e.g., virtual final method)
83 // fv flag true if invokeinterface used for method in class Object
84 //
85 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 16 with the
86 // following mapping to the TosState states:
87 //
88 // btos: 0
89 // ztos: 1
90 // ctos: 2
91 // stos: 3
92 // itos: 4
93 // ltos: 5
94 // ftos: 6
95 // dtos: 7
96 // atos: 8
97 // vtos: 9
98 //
99 // Entry specific: field entries:
167 assert((field_index & field_index_mask) == field_index, "field_index in range");
168 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
169 }
170 void set_method_flags(TosState return_type, int option_bits, int method_params) {
171 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
172 set_flags(make_flags(return_type, option_bits, method_params));
173 }
174
175 public:
176 // specific bit definitions for the flags field:
177 // (Note: the interpreter must use these definitions to access the CP cache.)
178 enum {
179 // high order bits are the TosState corresponding to field type or method return type
180 tos_state_bits = 4,
181 tos_state_mask = right_n_bits(tos_state_bits),
182 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
183 // misc. option bits; can be any bit position in [16..27]
184 is_field_entry_shift = 26, // (F) is it a field or a method?
185 has_local_signature_shift = 25, // (S) does the call site have a per-site signature (sig-poly methods)?
186 has_appendix_shift = 24, // (A) does the call site have an appendix argument?
187 is_null_free_inline_type_shift = 24, // (I) is the field a null free inline type (must never be null)
188 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode?
189 is_inlined_shift = 23, // (i) is the field inlined?
190 is_final_shift = 22, // (f) is the field or method final?
191 is_volatile_shift = 21, // (v) is the field volatile?
192 is_vfinal_shift = 20, // (vf) did the call resolve to a final method?
193 indy_resolution_failed_shift= 19, // (indy_rf) did call site specifier resolution fail ?
194 // low order bits give field index (for FieldInfo) or method parameter size:
195 field_index_bits = 16,
196 field_index_mask = right_n_bits(field_index_bits),
197 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
198 parameter_size_mask = right_n_bits(parameter_size_bits),
199 option_bits_mask = ~(((~0u) << tos_state_shift) | (field_index_mask | parameter_size_mask))
200 };
201
202 // specific bit definitions for the indices field:
203 enum {
204 cp_index_bits = 2*BitsPerByte,
205 cp_index_mask = right_n_bits(cp_index_bits),
206 bytecode_1_shift = cp_index_bits,
207 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF
208 bytecode_2_shift = cp_index_bits + BitsPerByte,
209 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF
210 };
211
212
213 // Initialization
214 void initialize_entry(int original_index); // initialize primary entry
215 void initialize_resolved_reference_index(int ref_index) {
216 assert(_f2 == 0, "set once"); // note: ref_index might be zero also
217 _f2 = ref_index;
218 }
219
220 void set_field( // sets entry to resolved field state
221 Bytecodes::Code get_code, // the bytecode used for reading the field
222 Bytecodes::Code put_code, // the bytecode used for writing the field
223 Klass* field_holder, // the object/klass holding the field
224 int orig_field_index, // the original field index in the field holder
225 int field_offset, // the field offset in words in the field holder
226 TosState field_type, // the (machine) field type
227 bool is_final, // the field is final
228 bool is_volatile, // the field is volatile
229 bool is_inlined, // the field is inlined
230 bool is_null_free_inline_type // the field is an inline type (must never be null)
231 );
232
233 private:
234 void set_direct_or_vtable_call(
235 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
236 const methodHandle& method, // the method/prototype if any (NULL, otherwise)
237 int vtable_index, // the vtable index if any, else negative
238 bool sender_is_interface
239 );
240
241 public:
242 void set_direct_call( // sets entry to exact concrete method entry
243 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
244 const methodHandle& method, // the method to call
245 bool sender_is_interface
246 );
247
248 void set_vtable_call( // sets entry to vtable index
249 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
250 const methodHandle& method, // resolved method which declares the vtable index
299 // invokedynamic and invokehandle call sites have an "appendix" item in the
300 // resolved references array.
301 Method* method_if_resolved(const constantPoolHandle& cpool);
302 oop appendix_if_resolved(const constantPoolHandle& cpool);
303
304 void set_parameter_size(int value);
305
306 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
307 // Returns -1 if neither is valid.
308 static int bytecode_number(Bytecodes::Code code) {
309 switch (code) {
310 case Bytecodes::_getstatic : // fall through
311 case Bytecodes::_getfield : // fall through
312 case Bytecodes::_invokespecial : // fall through
313 case Bytecodes::_invokestatic : // fall through
314 case Bytecodes::_invokehandle : // fall through
315 case Bytecodes::_invokedynamic : // fall through
316 case Bytecodes::_invokeinterface : return 1;
317 case Bytecodes::_putstatic : // fall through
318 case Bytecodes::_putfield : // fall through
319 case Bytecodes::_withfield : // fall through
320 case Bytecodes::_invokevirtual : return 2;
321 default : break;
322 }
323 return -1;
324 }
325
326 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
327 bool is_resolved(Bytecodes::Code code) const;
328
329 // Accessors
330 int indices() const { return _indices; }
331 int indices_ord() const;
332 int constant_pool_index() const { return (indices() & cp_index_mask); }
333 Bytecodes::Code bytecode_1() const;
334 Bytecodes::Code bytecode_2() const;
335 Metadata* f1_ord() const;
336 Method* f1_as_method() const;
337 Klass* f1_as_klass() const;
338 // Use the accessor f1() to acquire _f1's value. This is needed for
339 // example in BytecodeInterpreter::run(), where is_f1_null() is
340 // called to check if an invokedynamic call is resolved. This load
341 // of _f1 must be ordered with the loads performed by
342 // cache->main_entry_index().
343 bool is_f1_null() const; // classifies a CPC entry as unbound
344 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; }
345 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; }
346 Method* f2_as_interface_method() const;
347 int f2_as_offset() const { assert(is_field_entry(), ""); return (int)_f2; }
348 intx flags_ord() const;
349 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); }
350 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
351 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; }
352 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; }
353 bool is_inlined() const { return (_flags & (1 << is_inlined_shift)) != 0; }
354 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
355 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; }
356 bool indy_resolution_failed() const;
357 bool has_appendix() const;
358 bool has_local_signature() const;
359 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; }
360 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; }
361 bool is_long() const { return flag_state() == ltos; }
362 bool is_double() const { return flag_state() == dtos; }
363 bool is_null_free_inline_type() const { return (_flags & (1 << is_null_free_inline_type_shift)) != 0; }
364 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
365 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
366 void set_indy_resolution_failed();
367
368 // Code generation support
369 static WordSize size() {
370 return in_WordSize(align_up((int)sizeof(ConstantPoolCacheEntry), wordSize) / wordSize);
371 }
372 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
373 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
374 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
375 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
376 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
377
378 #if INCLUDE_JVMTI
379 // RedefineClasses() API support:
380 // If this ConstantPoolCacheEntry refers to old_method then update it
381 // to refer to new_method.
382 // trace_name_printed is set to true if the current call has
383 // printed the klass name so that other routines in the adjust_*
|