Mercurial > hg > truffle
annotate src/share/vm/ci/ciField.cpp @ 20691:03b7d9efd9fd
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author | dbuck |
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date | Thu, 04 Dec 2014 07:54:25 +0000 |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2013, 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 #include "precompiled.hpp" |
26 #include "ci/ciField.hpp" | |
27 #include "ci/ciInstanceKlass.hpp" | |
28 #include "ci/ciUtilities.hpp" | |
29 #include "classfile/systemDictionary.hpp" | |
30 #include "gc_interface/collectedHeap.inline.hpp" | |
31 #include "interpreter/linkResolver.hpp" | |
32 #include "memory/universe.inline.hpp" | |
33 #include "oops/oop.inline.hpp" | |
34 #include "oops/oop.inline2.hpp" | |
35 #include "runtime/fieldDescriptor.hpp" | |
0 | 36 |
37 // ciField | |
38 // | |
39 // This class represents the result of a field lookup in the VM. | |
40 // The lookup may not succeed, in which case the information in | |
41 // the ciField will be incomplete. | |
42 | |
43 // The ciObjectFactory cannot create circular data structures in one query. | |
44 // To avoid vicious circularities, we initialize ciField::_type to NULL | |
45 // for reference types and derive it lazily from the ciField::_signature. | |
46 // Primitive types are eagerly initialized, and basic layout queries | |
47 // can succeed without initialization, using only the BasicType of the field. | |
48 | |
49 // Notes on bootstrapping and shared CI objects: A field is shared if and | |
50 // only if it is (a) non-static and (b) declared by a shared instance klass. | |
51 // This allows non-static field lists to be cached on shared types. | |
52 // Because the _type field is lazily initialized, however, there is a | |
53 // special restriction that a shared field cannot cache an unshared type. | |
54 // This puts a small performance penalty on shared fields with unshared | |
55 // types, such as StackTraceElement[] Throwable.stackTrace. | |
56 // (Throwable is shared because ClassCastException is shared, but | |
57 // StackTraceElement is not presently shared.) | |
58 | |
59 // It is not a vicious circularity for a ciField to recursively create | |
60 // the ciSymbols necessary to represent its name and signature. | |
61 // Therefore, these items are created eagerly, and the name and signature | |
62 // of a shared field are themselves shared symbols. This somewhat | |
63 // pollutes the set of shared CI objects: It grows from 50 to 93 items, | |
64 // with all of the additional 43 being uninteresting shared ciSymbols. | |
65 // This adds at most one step to the binary search, an amount which | |
66 // decreases for complex compilation tasks. | |
67 | |
68 // ------------------------------------------------------------------ | |
69 // ciField::ciField | |
6151 | 70 ciField::ciField(ciInstanceKlass* klass, int index): _known_to_link_with_put(NULL), _known_to_link_with_get(NULL) { |
0 | 71 ASSERT_IN_VM; |
72 CompilerThread *thread = CompilerThread::current(); | |
73 | |
74 assert(ciObjectFactory::is_initialized(), "not a shared field"); | |
75 | |
76 assert(klass->get_instanceKlass()->is_linked(), "must be linked before using its constan-pool"); | |
77 | |
78 constantPoolHandle cpool(thread, klass->get_instanceKlass()->constants()); | |
79 | |
80 // Get the field's name, signature, and type. | |
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81 Symbol* name = cpool->name_ref_at(index); |
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82 _name = ciEnv::current(thread)->get_symbol(name); |
0 | 83 |
84 int nt_index = cpool->name_and_type_ref_index_at(index); | |
85 int sig_index = cpool->signature_ref_index_at(nt_index); | |
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86 Symbol* signature = cpool->symbol_at(sig_index); |
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87 _signature = ciEnv::current(thread)->get_symbol(signature); |
0 | 88 |
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89 BasicType field_type = FieldType::basic_type(signature); |
0 | 90 |
91 // If the field is a pointer type, get the klass of the | |
92 // field. | |
93 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
94 bool ignore; | |
95 // This is not really a class reference; the index always refers to the | |
96 // field's type signature, as a symbol. Linkage checks do not apply. | |
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97 _type = ciEnv::current(thread)->get_klass_by_index(cpool, sig_index, ignore, klass); |
0 | 98 } else { |
99 _type = ciType::make(field_type); | |
100 } | |
101 | |
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102 _name = (ciSymbol*)ciEnv::current(thread)->get_symbol(name); |
0 | 103 |
104 // Get the field's declared holder. | |
105 // | |
106 // Note: we actually create a ciInstanceKlass for this klass, | |
107 // even though we may not need to. | |
108 int holder_index = cpool->klass_ref_index_at(index); | |
109 bool holder_is_accessible; | |
110 ciInstanceKlass* declared_holder = | |
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111 ciEnv::current(thread)->get_klass_by_index(cpool, holder_index, |
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112 holder_is_accessible, |
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113 klass)->as_instance_klass(); |
0 | 114 |
115 // The declared holder of this field may not have been loaded. | |
116 // Bail out with partial field information. | |
117 if (!holder_is_accessible) { | |
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118 // _type has already been set. |
0 | 119 // The default values for _flags and _constant_value will suffice. |
120 // We need values for _holder, _offset, and _is_constant, | |
121 _holder = declared_holder; | |
122 _offset = -1; | |
123 _is_constant = false; | |
124 return; | |
125 } | |
126 | |
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127 InstanceKlass* loaded_decl_holder = declared_holder->get_instanceKlass(); |
0 | 128 |
129 // Perform the field lookup. | |
130 fieldDescriptor field_desc; | |
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131 Klass* canonical_holder = |
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132 loaded_decl_holder->find_field(name, signature, &field_desc); |
0 | 133 if (canonical_holder == NULL) { |
134 // Field lookup failed. Will be detected by will_link. | |
135 _holder = declared_holder; | |
136 _offset = -1; | |
137 _is_constant = false; | |
138 return; | |
139 } | |
140 | |
18036 | 141 // Access check based on declared_holder. canonical_holder should not be used |
142 // to check access because it can erroneously succeed. If this check fails, | |
143 // propagate the declared holder to will_link() which in turn will bail out | |
144 // compilation for this field access. | |
145 if (!Reflection::verify_field_access(klass->get_Klass(), declared_holder->get_Klass(), canonical_holder, field_desc.access_flags(), true)) { | |
146 _holder = declared_holder; | |
147 _offset = -1; | |
148 _is_constant = false; | |
149 return; | |
150 } | |
151 | |
0 | 152 assert(canonical_holder == field_desc.field_holder(), "just checking"); |
153 initialize_from(&field_desc); | |
154 } | |
155 | |
6151 | 156 ciField::ciField(fieldDescriptor *fd): _known_to_link_with_put(NULL), _known_to_link_with_get(NULL) { |
0 | 157 ASSERT_IN_VM; |
158 | |
159 // Get the field's name, signature, and type. | |
160 ciEnv* env = CURRENT_ENV; | |
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161 _name = env->get_symbol(fd->name()); |
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162 _signature = env->get_symbol(fd->signature()); |
0 | 163 |
164 BasicType field_type = fd->field_type(); | |
165 | |
166 // If the field is a pointer type, get the klass of the | |
167 // field. | |
168 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
169 _type = NULL; // must call compute_type on first access | |
170 } else { | |
171 _type = ciType::make(field_type); | |
172 } | |
173 | |
174 initialize_from(fd); | |
175 | |
176 // Either (a) it is marked shared, or else (b) we are done bootstrapping. | |
177 assert(is_shared() || ciObjectFactory::is_initialized(), | |
178 "bootstrap classes must not create & cache unshared fields"); | |
179 } | |
180 | |
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181 static bool trust_final_non_static_fields(ciInstanceKlass* holder) { |
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182 if (holder == NULL) |
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183 return false; |
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184 if (holder->name() == ciSymbol::java_lang_System()) |
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185 // Never trust strangely unstable finals: System.out, etc. |
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186 return false; |
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187 // Even if general trusting is disabled, trust system-built closures in these packages. |
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188 if (holder->is_in_package("java/lang/invoke") || holder->is_in_package("sun/invoke")) |
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189 return true; |
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190 return TrustFinalNonStaticFields; |
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191 } |
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192 |
0 | 193 void ciField::initialize_from(fieldDescriptor* fd) { |
194 // Get the flags, offset, and canonical holder of the field. | |
195 _flags = ciFlags(fd->access_flags()); | |
196 _offset = fd->offset(); | |
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197 _holder = CURRENT_ENV->get_instance_klass(fd->field_holder()); |
0 | 198 |
199 // Check to see if the field is constant. | |
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200 bool is_final = this->is_final(); |
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201 bool is_stable = FoldStableValues && this->is_stable(); |
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202 if (_holder->is_initialized() && (is_final || is_stable)) { |
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203 if (!this->is_static()) { |
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204 // A field can be constant if it's a final static field or if |
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205 // it's a final non-static field of a trusted class (classes in |
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206 // java.lang.invoke and sun.invoke packages and subpackages). |
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207 if (is_stable || trust_final_non_static_fields(_holder)) { |
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208 _is_constant = true; |
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209 return; |
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210 } |
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211 _is_constant = false; |
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212 return; |
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213 } |
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214 |
0 | 215 // This field just may be constant. The only cases where it will |
216 // not be constant are: | |
217 // | |
218 // 1. The field holds a non-perm-space oop. The field is, strictly | |
219 // speaking, constant but we cannot embed non-perm-space oops into | |
220 // generated code. For the time being we need to consider the | |
221 // field to be not constant. | |
222 // 2. The field is a *special* static&final field whose value | |
223 // may change. The three examples are java.lang.System.in, | |
224 // java.lang.System.out, and java.lang.System.err. | |
225 | |
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226 KlassHandle k = _holder->get_Klass(); |
1142 | 227 assert( SystemDictionary::System_klass() != NULL, "Check once per vm"); |
2261 | 228 if( k() == SystemDictionary::System_klass() ) { |
0 | 229 // Check offsets for case 2: System.in, System.out, or System.err |
230 if( _offset == java_lang_System::in_offset_in_bytes() || | |
231 _offset == java_lang_System::out_offset_in_bytes() || | |
232 _offset == java_lang_System::err_offset_in_bytes() ) { | |
233 _is_constant = false; | |
234 return; | |
235 } | |
236 } | |
237 | |
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238 Handle mirror = k->java_mirror(); |
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239 |
0 | 240 switch(type()->basic_type()) { |
241 case T_BYTE: | |
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242 _constant_value = ciConstant(type()->basic_type(), mirror->byte_field(_offset)); |
0 | 243 break; |
244 case T_CHAR: | |
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245 _constant_value = ciConstant(type()->basic_type(), mirror->char_field(_offset)); |
0 | 246 break; |
247 case T_SHORT: | |
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248 _constant_value = ciConstant(type()->basic_type(), mirror->short_field(_offset)); |
0 | 249 break; |
250 case T_BOOLEAN: | |
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251 _constant_value = ciConstant(type()->basic_type(), mirror->bool_field(_offset)); |
0 | 252 break; |
253 case T_INT: | |
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254 _constant_value = ciConstant(type()->basic_type(), mirror->int_field(_offset)); |
0 | 255 break; |
256 case T_FLOAT: | |
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257 _constant_value = ciConstant(mirror->float_field(_offset)); |
0 | 258 break; |
259 case T_DOUBLE: | |
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260 _constant_value = ciConstant(mirror->double_field(_offset)); |
0 | 261 break; |
262 case T_LONG: | |
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263 _constant_value = ciConstant(mirror->long_field(_offset)); |
0 | 264 break; |
265 case T_OBJECT: | |
266 case T_ARRAY: | |
267 { | |
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268 oop o = mirror->obj_field(_offset); |
0 | 269 |
270 // A field will be "constant" if it is known always to be | |
271 // a non-null reference to an instance of a particular class, | |
272 // or to a particular array. This can happen even if the instance | |
273 // or array is not perm. In such a case, an "unloaded" ciArray | |
274 // or ciInstance is created. The compiler may be able to use | |
275 // information about the object's class (which is exact) or length. | |
276 | |
277 if (o == NULL) { | |
278 _constant_value = ciConstant(type()->basic_type(), ciNullObject::make()); | |
279 } else { | |
280 _constant_value = ciConstant(type()->basic_type(), CURRENT_ENV->get_object(o)); | |
281 assert(_constant_value.as_object() == CURRENT_ENV->get_object(o), "check interning"); | |
282 } | |
283 } | |
284 } | |
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285 if (is_stable && _constant_value.is_null_or_zero()) { |
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286 // It is not a constant after all; treat it as uninitialized. |
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287 _is_constant = false; |
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288 } else { |
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289 _is_constant = true; |
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290 } |
0 | 291 } else { |
292 _is_constant = false; | |
293 } | |
294 } | |
295 | |
296 // ------------------------------------------------------------------ | |
297 // ciField::compute_type | |
298 // | |
299 // Lazily compute the type, if it is an instance klass. | |
300 ciType* ciField::compute_type() { | |
301 GUARDED_VM_ENTRY(return compute_type_impl();) | |
302 } | |
303 | |
304 ciType* ciField::compute_type_impl() { | |
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305 ciKlass* type = CURRENT_ENV->get_klass_by_name_impl(_holder, constantPoolHandle(), _signature, false); |
0 | 306 if (!type->is_primitive_type() && is_shared()) { |
307 // We must not cache a pointer to an unshared type, in a shared field. | |
308 bool type_is_also_shared = false; | |
309 if (type->is_type_array_klass()) { | |
310 type_is_also_shared = true; // int[] etc. are explicitly bootstrapped | |
311 } else if (type->is_instance_klass()) { | |
312 type_is_also_shared = type->as_instance_klass()->is_shared(); | |
313 } else { | |
314 // Currently there is no 'shared' query for array types. | |
315 type_is_also_shared = !ciObjectFactory::is_initialized(); | |
316 } | |
317 if (!type_is_also_shared) | |
318 return type; // Bummer. | |
319 } | |
320 _type = type; | |
321 return type; | |
322 } | |
323 | |
324 | |
325 // ------------------------------------------------------------------ | |
326 // ciField::will_link | |
327 // | |
328 // Can a specific access to this field be made without causing | |
329 // link errors? | |
330 bool ciField::will_link(ciInstanceKlass* accessing_klass, | |
331 Bytecodes::Code bc) { | |
332 VM_ENTRY_MARK; | |
6151 | 333 assert(bc == Bytecodes::_getstatic || bc == Bytecodes::_putstatic || |
334 bc == Bytecodes::_getfield || bc == Bytecodes::_putfield, | |
335 "unexpected bytecode"); | |
336 | |
0 | 337 if (_offset == -1) { |
338 // at creation we couldn't link to our holder so we need to | |
339 // maintain that stance, otherwise there's no safe way to use this | |
340 // ciField. | |
341 return false; | |
342 } | |
343 | |
6151 | 344 // Check for static/nonstatic mismatch |
345 bool is_static = (bc == Bytecodes::_getstatic || bc == Bytecodes::_putstatic); | |
346 if (is_static != this->is_static()) { | |
347 return false; | |
348 } | |
349 | |
350 // Get and put can have different accessibility rules | |
351 bool is_put = (bc == Bytecodes::_putfield || bc == Bytecodes::_putstatic); | |
352 if (is_put) { | |
353 if (_known_to_link_with_put == accessing_klass) { | |
354 return true; | |
355 } | |
6153 | 356 } else { |
6151 | 357 if (_known_to_link_with_get == accessing_klass) { |
358 return true; | |
359 } | |
0 | 360 } |
361 | |
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362 fieldDescriptor result; |
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363 LinkResolver::resolve_field(result, _holder->get_instanceKlass(), |
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364 _name->get_symbol(), _signature->get_symbol(), |
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365 accessing_klass->get_Klass(), bc, true, false, |
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366 KILL_COMPILE_ON_FATAL_(false)); |
0 | 367 |
368 // update the hit-cache, unless there is a problem with memory scoping: | |
6151 | 369 if (accessing_klass->is_shared() || !is_shared()) { |
370 if (is_put) { | |
371 _known_to_link_with_put = accessing_klass; | |
372 } else { | |
373 _known_to_link_with_get = accessing_klass; | |
374 } | |
375 } | |
0 | 376 |
377 return true; | |
378 } | |
379 | |
380 // ------------------------------------------------------------------ | |
381 // ciField::print | |
382 void ciField::print() { | |
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383 tty->print("<ciField name="); |
0 | 384 _holder->print_name(); |
385 tty->print("."); | |
386 _name->print_symbol(); | |
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387 tty->print(" signature="); |
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388 _signature->print_symbol(); |
0 | 389 tty->print(" offset=%d type=", _offset); |
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390 if (_type != NULL) |
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391 _type->print_name(); |
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392 else |
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393 tty->print("(reference)"); |
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394 tty->print(" flags=%04x", flags().as_int()); |
0 | 395 tty->print(" is_constant=%s", bool_to_str(_is_constant)); |
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396 if (_is_constant && is_static()) { |
0 | 397 tty->print(" constant_value="); |
398 _constant_value.print(); | |
399 } | |
400 tty->print(">"); | |
401 } | |
402 | |
403 // ------------------------------------------------------------------ | |
404 // ciField::print_name_on | |
405 // | |
406 // Print the name of this field | |
407 void ciField::print_name_on(outputStream* st) { | |
408 name()->print_symbol_on(st); | |
409 } |