ciStreams.cpp revision 1499:e9ff18c4ace7
1/* 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_ciStreams.cpp.incl" 27 28// ciExceptionHandlerStream 29// 30// Walk over some selected set of a methods exception handlers. 31 32// ------------------------------------------------------------------ 33// ciExceptionHandlerStream::count 34// 35// How many exception handlers are there in this stream? 36// 37// Implementation note: Compiler2 needs this functionality, so I had 38int ciExceptionHandlerStream::count() { 39 int save_pos = _pos; 40 int save_end = _end; 41 42 int count = 0; 43 44 _pos = -1; 45 _end = _method->_handler_count; 46 47 48 next(); 49 while (!is_done()) { 50 count++; 51 next(); 52 } 53 54 _pos = save_pos; 55 _end = save_end; 56 57 return count; 58} 59 60int ciExceptionHandlerStream::count_remaining() { 61 int save_pos = _pos; 62 int save_end = _end; 63 64 int count = 0; 65 66 while (!is_done()) { 67 count++; 68 next(); 69 } 70 71 _pos = save_pos; 72 _end = save_end; 73 74 return count; 75} 76 77// ciBytecodeStream 78// 79// The class is used to iterate over the bytecodes of a method. 80// It hides the details of constant pool structure/access by 81// providing accessors for constant pool items. 82 83// ------------------------------------------------------------------ 84// ciBytecodeStream::next_wide_or_table 85// 86// Special handling for switch ops 87Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) { 88 switch (bc) { // Check for special bytecode handling 89 case Bytecodes::_wide: 90 // Special handling for the wide bytcode 91 // Get following bytecode; do not return wide 92 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, ""); 93 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]); 94 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress"); 95 _pc += Bytecodes::wide_length_for(bc); 96 _was_wide = _pc; // Flag last wide bytecode found 97 assert(is_wide(), "accessor works right"); 98 break; 99 100 case Bytecodes::_lookupswitch: 101 _pc++; // Skip wide bytecode 102 _pc += (_start-_pc)&3; // Word align 103 _table_base = (jint*)_pc; // Capture for later usage 104 // table_base[0] is default far_dest 105 // Table has 2 lead elements (default, length), then pairs of u4 values. 106 // So load table length, and compute address at end of table 107 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])]; 108 break; 109 110 case Bytecodes::_tableswitch: { 111 _pc++; // Skip wide bytecode 112 _pc += (_start-_pc)&3; // Word align 113 _table_base = (jint*)_pc; // Capture for later usage 114 // table_base[0] is default far_dest 115 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound 116 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound 117 int len = hi - lo + 1; // Dense table size 118 _pc = (address)&_table_base[3+len]; // Skip past table 119 break; 120 } 121 122 default: 123 fatal("unhandled bytecode"); 124 } 125 return bc; 126} 127 128// ------------------------------------------------------------------ 129// ciBytecodeStream::reset_to_bci 130void ciBytecodeStream::reset_to_bci( int bci ) { 131 _bc_start=_was_wide=0; 132 _pc = _start+bci; 133} 134 135// ------------------------------------------------------------------ 136// ciBytecodeStream::force_bci 137void ciBytecodeStream::force_bci(int bci) { 138 if (bci < 0) { 139 reset_to_bci(0); 140 _bc_start = _start + bci; 141 _bc = EOBC(); 142 } else { 143 reset_to_bci(bci); 144 next(); 145 } 146} 147 148 149// ------------------------------------------------------------------ 150// Constant pool access 151// ------------------------------------------------------------------ 152 153// ------------------------------------------------------------------ 154// ciBytecodeStream::get_klass_index 155// 156// If this bytecodes references a klass, return the index of the 157// referenced klass. 158int ciBytecodeStream::get_klass_index() const { 159 switch(cur_bc()) { 160 case Bytecodes::_ldc: 161 return get_index_u1(); 162 case Bytecodes::_ldc_w: 163 case Bytecodes::_ldc2_w: 164 case Bytecodes::_checkcast: 165 case Bytecodes::_instanceof: 166 case Bytecodes::_anewarray: 167 case Bytecodes::_multianewarray: 168 case Bytecodes::_new: 169 case Bytecodes::_newarray: 170 return get_index_u2(); 171 default: 172 ShouldNotReachHere(); 173 return 0; 174 } 175} 176 177// ------------------------------------------------------------------ 178// ciBytecodeStream::get_klass 179// 180// If this bytecode is a new, newarray, multianewarray, instanceof, 181// or checkcast, get the referenced klass. 182ciKlass* ciBytecodeStream::get_klass(bool& will_link) { 183 VM_ENTRY_MARK; 184 constantPoolHandle cpool(_method->get_methodOop()->constants()); 185 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder); 186} 187 188// ------------------------------------------------------------------ 189// ciBytecodeStream::get_constant_index 190// 191// If this bytecode is one of the ldc variants, get the index of the 192// referenced constant. 193int ciBytecodeStream::get_constant_index() const { 194 switch(cur_bc()) { 195 case Bytecodes::_ldc: 196 return get_index_u1(); 197 case Bytecodes::_ldc_w: 198 case Bytecodes::_ldc2_w: 199 return get_index_u2(); 200 default: 201 ShouldNotReachHere(); 202 return 0; 203 } 204} 205// ------------------------------------------------------------------ 206// ciBytecodeStream::get_constant 207// 208// If this bytecode is one of the ldc variants, get the referenced 209// constant. 210ciConstant ciBytecodeStream::get_constant() { 211 VM_ENTRY_MARK; 212 constantPoolHandle cpool(_method->get_methodOop()->constants()); 213 return CURRENT_ENV->get_constant_by_index(cpool, get_constant_index(), _holder); 214} 215 216// ------------------------------------------------------------------ 217bool ciBytecodeStream::is_unresolved_string() const { 218 return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index()); 219} 220 221// ------------------------------------------------------------------ 222bool ciBytecodeStream::is_unresolved_klass() const { 223 return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index()); 224} 225 226// ------------------------------------------------------------------ 227// ciBytecodeStream::get_field_index 228// 229// If this is a field access bytecode, get the constant pool 230// index of the referenced field. 231int ciBytecodeStream::get_field_index() { 232 assert(cur_bc() == Bytecodes::_getfield || 233 cur_bc() == Bytecodes::_putfield || 234 cur_bc() == Bytecodes::_getstatic || 235 cur_bc() == Bytecodes::_putstatic, "wrong bc"); 236 return get_index_u2_cpcache(); 237} 238 239 240// ------------------------------------------------------------------ 241// ciBytecodeStream::get_field 242// 243// If this bytecode is one of get_field, get_static, put_field, 244// or put_static, get the referenced field. 245ciField* ciBytecodeStream::get_field(bool& will_link) { 246 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index()); 247 will_link = f->will_link(_holder, _bc); 248 return f; 249} 250 251 252// ------------------------------------------------------------------ 253// ciBytecodeStream::get_declared_field_holder 254// 255// Get the declared holder of the currently referenced field. 256// 257// Usage note: the holder() of a ciField class returns the canonical 258// holder of the field, rather than the holder declared in the 259// bytecodes. 260// 261// There is no "will_link" result passed back. The user is responsible 262// for checking linkability when retrieving the associated field. 263ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() { 264 VM_ENTRY_MARK; 265 constantPoolHandle cpool(_method->get_methodOop()->constants()); 266 int holder_index = get_field_holder_index(); 267 bool ignore; 268 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder) 269 ->as_instance_klass(); 270} 271 272// ------------------------------------------------------------------ 273// ciBytecodeStream::get_field_holder_index 274// 275// Get the constant pool index of the declared holder of the field 276// referenced by the current bytecode. Used for generating 277// deoptimization information. 278int ciBytecodeStream::get_field_holder_index() { 279 GUARDED_VM_ENTRY( 280 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 281 return cpool->klass_ref_index_at(get_field_index()); 282 ) 283} 284 285// ------------------------------------------------------------------ 286// ciBytecodeStream::get_field_signature_index 287// 288// Get the constant pool index of the signature of the field 289// referenced by the current bytecode. Used for generating 290// deoptimization information. 291int ciBytecodeStream::get_field_signature_index() { 292 VM_ENTRY_MARK; 293 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 294 int nt_index = cpool->name_and_type_ref_index_at(get_field_index()); 295 return cpool->signature_ref_index_at(nt_index); 296} 297 298// ------------------------------------------------------------------ 299// ciBytecodeStream::get_method_index 300// 301// If this is a method invocation bytecode, get the constant pool 302// index of the invoked method. 303int ciBytecodeStream::get_method_index() { 304#ifdef ASSERT 305 switch (cur_bc()) { 306 case Bytecodes::_invokeinterface: 307 case Bytecodes::_invokevirtual: 308 case Bytecodes::_invokespecial: 309 case Bytecodes::_invokestatic: 310 case Bytecodes::_invokedynamic: 311 break; 312 default: 313 ShouldNotReachHere(); 314 } 315#endif 316 if (has_index_u4()) 317 return get_index_u4(); // invokedynamic 318 return get_index_u2_cpcache(); 319} 320 321// ------------------------------------------------------------------ 322// ciBytecodeStream::get_method 323// 324// If this is a method invocation bytecode, get the invoked method. 325ciMethod* ciBytecodeStream::get_method(bool& will_link) { 326 VM_ENTRY_MARK; 327 constantPoolHandle cpool(_method->get_methodOop()->constants()); 328 ciMethod* m = CURRENT_ENV->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder); 329 will_link = m->is_loaded(); 330 return m; 331} 332 333// ------------------------------------------------------------------ 334// ciBytecodeStream::get_declared_method_holder 335// 336// Get the declared holder of the currently referenced method. 337// 338// Usage note: the holder() of a ciMethod class returns the canonical 339// holder of the method, rather than the holder declared in the 340// bytecodes. 341// 342// There is no "will_link" result passed back. The user is responsible 343// for checking linkability when retrieving the associated method. 344ciKlass* ciBytecodeStream::get_declared_method_holder() { 345 VM_ENTRY_MARK; 346 constantPoolHandle cpool(_method->get_methodOop()->constants()); 347 bool ignore; 348 // report as InvokeDynamic for invokedynamic, which is syntactically classless 349 if (cur_bc() == Bytecodes::_invokedynamic) 350 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_dyn_InvokeDynamic(), false); 351 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder); 352} 353 354// ------------------------------------------------------------------ 355// ciBytecodeStream::get_method_holder_index 356// 357// Get the constant pool index of the declared holder of the method 358// referenced by the current bytecode. Used for generating 359// deoptimization information. 360int ciBytecodeStream::get_method_holder_index() { 361 constantPoolOop cpool = _method->get_methodOop()->constants(); 362 return cpool->klass_ref_index_at(get_method_index()); 363} 364 365// ------------------------------------------------------------------ 366// ciBytecodeStream::get_method_signature_index 367// 368// Get the constant pool index of the signature of the method 369// referenced by the current bytecode. Used for generating 370// deoptimization information. 371int ciBytecodeStream::get_method_signature_index() { 372 VM_ENTRY_MARK; 373 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 374 int method_index = get_method_index(); 375 int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); 376 return cpool->signature_ref_index_at(name_and_type_index); 377} 378 379// ------------------------------------------------------------------ 380// ciBytecodeStream::get_cpcache 381ciCPCache* ciBytecodeStream::get_cpcache() { 382 VM_ENTRY_MARK; 383 // Get the constant pool. 384 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 385 constantPoolCacheOop cpcache = cpool->cache(); 386 387 return CURRENT_ENV->get_object(cpcache)->as_cpcache(); 388} 389 390// ------------------------------------------------------------------ 391// ciBytecodeStream::get_call_site 392ciCallSite* ciBytecodeStream::get_call_site() { 393 VM_ENTRY_MARK; 394 // Get the constant pool. 395 constantPoolOop cpool = _holder->get_instanceKlass()->constants(); 396 constantPoolCacheOop cpcache = cpool->cache(); 397 398 // Get the CallSite from the constant pool cache. 399 int method_index = get_method_index(); 400 ConstantPoolCacheEntry* cpcache_entry = cpcache->secondary_entry_at(method_index); 401 oop call_site_oop = cpcache_entry->f1(); 402 403 // Create a CallSite object and return it. 404 return CURRENT_ENV->get_object(call_site_oop)->as_call_site(); 405} 406