ciStreams.cpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "ci/ciCallSite.hpp" 27#include "ci/ciConstant.hpp" 28#include "ci/ciField.hpp" 29#include "ci/ciStreams.hpp" 30#include "ci/ciUtilities.hpp" 31 32// ciExceptionHandlerStream 33// 34// Walk over some selected set of a methods exception handlers. 35 36// ------------------------------------------------------------------ 37// ciExceptionHandlerStream::count 38// 39// How many exception handlers are there in this stream? 40// 41// Implementation note: Compiler2 needs this functionality, so I had 42int ciExceptionHandlerStream::count() { 43 int save_pos = _pos; 44 int save_end = _end; 45 46 int count = 0; 47 48 _pos = -1; 49 _end = _method->_handler_count; 50 51 52 next(); 53 while (!is_done()) { 54 count++; 55 next(); 56 } 57 58 _pos = save_pos; 59 _end = save_end; 60 61 return count; 62} 63 64int ciExceptionHandlerStream::count_remaining() { 65 int save_pos = _pos; 66 int save_end = _end; 67 68 int count = 0; 69 70 while (!is_done()) { 71 count++; 72 next(); 73 } 74 75 _pos = save_pos; 76 _end = save_end; 77 78 return count; 79} 80 81// ciBytecodeStream 82// 83// The class is used to iterate over the bytecodes of a method. 84// It hides the details of constant pool structure/access by 85// providing accessors for constant pool items. 86 87// ------------------------------------------------------------------ 88// ciBytecodeStream::next_wide_or_table 89// 90// Special handling for switch ops 91Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) { 92 switch (bc) { // Check for special bytecode handling 93 case Bytecodes::_wide: 94 // Special handling for the wide bytcode 95 // Get following bytecode; do not return wide 96 assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, ""); 97 bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]); 98 assert(Bytecodes::wide_length_for(bc) > 2, "must make progress"); 99 _pc += Bytecodes::wide_length_for(bc); 100 _was_wide = _pc; // Flag last wide bytecode found 101 assert(is_wide(), "accessor works right"); 102 break; 103 104 case Bytecodes::_lookupswitch: 105 _pc++; // Skip wide bytecode 106 _pc += (_start-_pc)&3; // Word align 107 _table_base = (jint*)_pc; // Capture for later usage 108 // table_base[0] is default far_dest 109 // Table has 2 lead elements (default, length), then pairs of u4 values. 110 // So load table length, and compute address at end of table 111 _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])]; 112 break; 113 114 case Bytecodes::_tableswitch: { 115 _pc++; // Skip wide bytecode 116 _pc += (_start-_pc)&3; // Word align 117 _table_base = (jint*)_pc; // Capture for later usage 118 // table_base[0] is default far_dest 119 int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound 120 int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound 121 int len = hi - lo + 1; // Dense table size 122 _pc = (address)&_table_base[3+len]; // Skip past table 123 break; 124 } 125 126 default: 127 fatal("unhandled bytecode"); 128 } 129 return bc; 130} 131 132// ------------------------------------------------------------------ 133// ciBytecodeStream::reset_to_bci 134void ciBytecodeStream::reset_to_bci( int bci ) { 135 _bc_start=_was_wide=0; 136 _pc = _start+bci; 137} 138 139// ------------------------------------------------------------------ 140// ciBytecodeStream::force_bci 141void ciBytecodeStream::force_bci(int bci) { 142 if (bci < 0) { 143 reset_to_bci(0); 144 _bc_start = _start + bci; 145 _bc = EOBC(); 146 } else { 147 reset_to_bci(bci); 148 next(); 149 } 150} 151 152 153// ------------------------------------------------------------------ 154// Constant pool access 155// ------------------------------------------------------------------ 156 157// ------------------------------------------------------------------ 158// ciBytecodeStream::get_klass_index 159// 160// If this bytecodes references a klass, return the index of the 161// referenced klass. 162int ciBytecodeStream::get_klass_index() const { 163 switch(cur_bc()) { 164 case Bytecodes::_ldc: 165 return get_index_u1(); 166 case Bytecodes::_ldc_w: 167 case Bytecodes::_ldc2_w: 168 case Bytecodes::_checkcast: 169 case Bytecodes::_instanceof: 170 case Bytecodes::_anewarray: 171 case Bytecodes::_multianewarray: 172 case Bytecodes::_new: 173 case Bytecodes::_newarray: 174 return get_index_u2(); 175 default: 176 ShouldNotReachHere(); 177 return 0; 178 } 179} 180 181// ------------------------------------------------------------------ 182// ciBytecodeStream::get_klass 183// 184// If this bytecode is a new, newarray, multianewarray, instanceof, 185// or checkcast, get the referenced klass. 186ciKlass* ciBytecodeStream::get_klass(bool& will_link) { 187 VM_ENTRY_MARK; 188 constantPoolHandle cpool(_method->get_Method()->constants()); 189 return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder); 190} 191 192// ------------------------------------------------------------------ 193// ciBytecodeStream::get_constant_raw_index 194// 195// If this bytecode is one of the ldc variants, get the index of the 196// referenced constant. 197int ciBytecodeStream::get_constant_raw_index() const { 198 // work-alike for Bytecode_loadconstant::raw_index() 199 switch (cur_bc()) { 200 case Bytecodes::_ldc: 201 return get_index_u1(); 202 case Bytecodes::_ldc_w: 203 case Bytecodes::_ldc2_w: 204 return get_index_u2(); 205 default: 206 ShouldNotReachHere(); 207 return 0; 208 } 209} 210 211// ------------------------------------------------------------------ 212// ciBytecodeStream::get_constant_pool_index 213// Decode any reference index into a regular pool index. 214int ciBytecodeStream::get_constant_pool_index() const { 215 // work-alike for Bytecode_loadconstant::pool_index() 216 int index = get_constant_raw_index(); 217 if (has_cache_index()) { 218 VM_ENTRY_MARK; 219 constantPoolHandle cpool(_method->get_Method()->constants()); 220 return cpool->object_to_cp_index(index); 221 } 222 return index; 223} 224 225// ------------------------------------------------------------------ 226// ciBytecodeStream::get_constant_cache_index 227// Return the CP cache index, or -1 if there isn't any. 228int ciBytecodeStream::get_constant_cache_index() const { 229 // work-alike for Bytecode_loadconstant::cache_index() 230 return has_cache_index() ? get_constant_raw_index() : -1; 231} 232 233// ------------------------------------------------------------------ 234// ciBytecodeStream::get_constant 235// 236// If this bytecode is one of the ldc variants, get the referenced 237// constant. 238ciConstant ciBytecodeStream::get_constant() { 239 int pool_index = get_constant_raw_index(); 240 int cache_index = -1; 241 if (has_cache_index()) { 242 cache_index = pool_index; 243 pool_index = -1; 244 } 245 VM_ENTRY_MARK; 246 constantPoolHandle cpool(_method->get_Method()->constants()); 247 return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder); 248} 249 250// ------------------------------------------------------------------ 251// ciBytecodeStream::get_constant_pool_tag 252// 253// If this bytecode is one of the ldc variants, get the referenced 254// constant. 255constantTag ciBytecodeStream::get_constant_pool_tag(int index) const { 256 VM_ENTRY_MARK; 257 return _method->get_Method()->constants()->tag_at(index); 258} 259 260// ------------------------------------------------------------------ 261// ciBytecodeStream::get_field_index 262// 263// If this is a field access bytecode, get the constant pool 264// index of the referenced field. 265int ciBytecodeStream::get_field_index() { 266 assert(cur_bc() == Bytecodes::_getfield || 267 cur_bc() == Bytecodes::_putfield || 268 cur_bc() == Bytecodes::_getstatic || 269 cur_bc() == Bytecodes::_putstatic, "wrong bc"); 270 return get_index_u2_cpcache(); 271} 272 273 274// ------------------------------------------------------------------ 275// ciBytecodeStream::get_field 276// 277// If this bytecode is one of get_field, get_static, put_field, 278// or put_static, get the referenced field. 279ciField* ciBytecodeStream::get_field(bool& will_link) { 280 ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index()); 281 will_link = f->will_link(_holder, _bc); 282 return f; 283} 284 285 286// ------------------------------------------------------------------ 287// ciBytecodeStream::get_declared_field_holder 288// 289// Get the declared holder of the currently referenced field. 290// 291// Usage note: the holder() of a ciField class returns the canonical 292// holder of the field, rather than the holder declared in the 293// bytecodes. 294// 295// There is no "will_link" result passed back. The user is responsible 296// for checking linkability when retrieving the associated field. 297ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() { 298 VM_ENTRY_MARK; 299 constantPoolHandle cpool(_method->get_Method()->constants()); 300 int holder_index = get_field_holder_index(); 301 bool ignore; 302 return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder) 303 ->as_instance_klass(); 304} 305 306// ------------------------------------------------------------------ 307// ciBytecodeStream::get_field_holder_index 308// 309// Get the constant pool index of the declared holder of the field 310// referenced by the current bytecode. Used for generating 311// deoptimization information. 312int ciBytecodeStream::get_field_holder_index() { 313 GUARDED_VM_ENTRY( 314 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 315 return cpool->klass_ref_index_at(get_field_index()); 316 ) 317} 318 319// ------------------------------------------------------------------ 320// ciBytecodeStream::get_field_signature_index 321// 322// Get the constant pool index of the signature of the field 323// referenced by the current bytecode. Used for generating 324// deoptimization information. 325int ciBytecodeStream::get_field_signature_index() { 326 VM_ENTRY_MARK; 327 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 328 int nt_index = cpool->name_and_type_ref_index_at(get_field_index()); 329 return cpool->signature_ref_index_at(nt_index); 330} 331 332// ------------------------------------------------------------------ 333// ciBytecodeStream::get_method_index 334// 335// If this is a method invocation bytecode, get the constant pool 336// index of the invoked method. 337int ciBytecodeStream::get_method_index() { 338#ifdef ASSERT 339 switch (cur_bc()) { 340 case Bytecodes::_invokeinterface: 341 case Bytecodes::_invokevirtual: 342 case Bytecodes::_invokespecial: 343 case Bytecodes::_invokestatic: 344 case Bytecodes::_invokedynamic: 345 break; 346 default: 347 ShouldNotReachHere(); 348 } 349#endif 350 if (has_index_u4()) 351 return get_index_u4(); // invokedynamic 352 return get_index_u2_cpcache(); 353} 354 355// ------------------------------------------------------------------ 356// ciBytecodeStream::get_method 357// 358// If this is a method invocation bytecode, get the invoked method. 359// Additionally return the declared signature to get more concrete 360// type information if required (Cf. invokedynamic and invokehandle). 361ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) { 362 VM_ENTRY_MARK; 363 ciEnv* env = CURRENT_ENV; 364 constantPoolHandle cpool(_method->get_Method()->constants()); 365 ciMethod* m = env->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder); 366 will_link = m->is_loaded(); 367 // Get declared method signature and return it. 368 if (has_optional_appendix()) { 369 const int sig_index = get_method_signature_index(); 370 Symbol* sig_sym = cpool->symbol_at(sig_index); 371 ciKlass* pool_holder = env->get_klass(cpool->pool_holder()); 372 (*declared_signature_result) = new (env->arena()) ciSignature(pool_holder, cpool, env->get_symbol(sig_sym)); 373 } else { 374 (*declared_signature_result) = m->signature(); 375 } 376 return m; 377} 378 379// ------------------------------------------------------------------ 380// ciBytecodeStream::has_appendix 381// 382// Returns true if there is an appendix argument stored in the 383// constant pool cache at the current bci. 384bool ciBytecodeStream::has_appendix() { 385 VM_ENTRY_MARK; 386 constantPoolHandle cpool(_method->get_Method()->constants()); 387 return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index()); 388} 389 390// ------------------------------------------------------------------ 391// ciBytecodeStream::get_appendix 392// 393// Return the appendix argument stored in the constant pool cache at 394// the current bci. 395ciObject* ciBytecodeStream::get_appendix() { 396 VM_ENTRY_MARK; 397 constantPoolHandle cpool(_method->get_Method()->constants()); 398 oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index()); 399 return CURRENT_ENV->get_object(appendix_oop); 400} 401 402// ------------------------------------------------------------------ 403// ciBytecodeStream::get_declared_method_holder 404// 405// Get the declared holder of the currently referenced method. 406// 407// Usage note: the holder() of a ciMethod class returns the canonical 408// holder of the method, rather than the holder declared in the 409// bytecodes. 410// 411// There is no "will_link" result passed back. The user is responsible 412// for checking linkability when retrieving the associated method. 413ciKlass* ciBytecodeStream::get_declared_method_holder() { 414 VM_ENTRY_MARK; 415 constantPoolHandle cpool(_method->get_Method()->constants()); 416 bool ignore; 417 // report as MethodHandle for invokedynamic, which is syntactically classless 418 if (cur_bc() == Bytecodes::_invokedynamic) 419 return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), false); 420 return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder); 421} 422 423// ------------------------------------------------------------------ 424// ciBytecodeStream::get_method_holder_index 425// 426// Get the constant pool index of the declared holder of the method 427// referenced by the current bytecode. Used for generating 428// deoptimization information. 429int ciBytecodeStream::get_method_holder_index() { 430 ConstantPool* cpool = _method->get_Method()->constants(); 431 return cpool->klass_ref_index_at(get_method_index()); 432} 433 434// ------------------------------------------------------------------ 435// ciBytecodeStream::get_method_signature_index 436// 437// Get the constant pool index of the signature of the method 438// referenced by the current bytecode. Used for generating 439// deoptimization information. 440int ciBytecodeStream::get_method_signature_index() { 441 GUARDED_VM_ENTRY( 442 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 443 const int method_index = get_method_index(); 444 const int name_and_type_index = cpool->name_and_type_ref_index_at(method_index); 445 return cpool->signature_ref_index_at(name_and_type_index); 446 ) 447} 448 449// ------------------------------------------------------------------ 450// ciBytecodeStream::get_resolved_references 451ciObjArray* ciBytecodeStream::get_resolved_references() { 452 VM_ENTRY_MARK; 453 // Get the constant pool. 454 ConstantPool* cpool = _holder->get_instanceKlass()->constants(); 455 456 // Create a resolved references array and return it. 457 return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array(); 458 } 459