1 /*
2 * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.code;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.oops.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34 import sun.jvm.hotspot.utilities.*;
35
36 public class NMethod extends CodeBlob {
37 private static long pcDescSize;
38 private static CIntegerField zombieInstructionSizeField;
39 private static sun.jvm.hotspot.types.OopField methodField;
40 /** != InvocationEntryBci if this nmethod is an on-stack replacement method */
41 private static CIntegerField entryBCIField;
42 /** To support simple linked-list chaining of nmethods */
43 private static AddressField linkField;
44 /** Offsets for different nmethod parts */
45 private static CIntegerField exceptionOffsetField;
46 private static CIntegerField deoptOffsetField;
47 private static CIntegerField origPCOffsetField;
48 private static CIntegerField stubOffsetField;
49 private static CIntegerField scopesDataOffsetField;
50 private static CIntegerField scopesPCsOffsetField;
51 private static CIntegerField dependenciesOffsetField;
52 private static CIntegerField handlerTableOffsetField;
53 private static CIntegerField nulChkTableOffsetField;
54 private static CIntegerField nmethodEndOffsetField;
55
56 /** Offsets for entry points */
57 /** Entry point with class check */
58 private static AddressField entryPointField;
59 /** Entry point without class check */
60 private static AddressField verifiedEntryPointField;
61 /** Entry point for on stack replacement */
62 private static AddressField osrEntryPointField;
63
70 this mark to current sweep invocation count if it is seen on the
71 stack. An not_entrant method can be removed when there is no
72 more activations, i.e., when the _stack_traversal_mark is less than
73 current sweep traversal index. */
74 private static CIntegerField stackTraversalMarkField;
75
76 static {
77 VM.registerVMInitializedObserver(new Observer() {
78 public void update(Observable o, Object data) {
79 initialize(VM.getVM().getTypeDataBase());
80 }
81 });
82 }
83
84 private static void initialize(TypeDataBase db) {
85 Type type = db.lookupType("nmethod");
86
87 zombieInstructionSizeField = type.getCIntegerField("_zombie_instruction_size");
88 methodField = type.getOopField("_method");
89 entryBCIField = type.getCIntegerField("_entry_bci");
90 linkField = type.getAddressField("_link");
91 exceptionOffsetField = type.getCIntegerField("_exception_offset");
92 deoptOffsetField = type.getCIntegerField("_deoptimize_offset");
93 origPCOffsetField = type.getCIntegerField("_orig_pc_offset");
94 stubOffsetField = type.getCIntegerField("_stub_offset");
95 scopesDataOffsetField = type.getCIntegerField("_scopes_data_offset");
96 scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset");
97 dependenciesOffsetField = type.getCIntegerField("_dependencies_offset");
98 handlerTableOffsetField = type.getCIntegerField("_handler_table_offset");
99 nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset");
100 nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset");
101 entryPointField = type.getAddressField("_entry_point");
102 verifiedEntryPointField = type.getAddressField("_verified_entry_point");
103 osrEntryPointField = type.getAddressField("_osr_entry_point");
104 lockCountField = type.getJIntField("_lock_count");
105 stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark");
106
107 pcDescSize = db.lookupType("PcDesc").getSize();
108 }
109
110 public NMethod(Address addr) {
202 // public boolean isOld();
203 // public int age();
204 // public boolean isMarkedForDeoptimization();
205 // public boolean isMarkedForUnloading();
206 // public boolean isMarkedForReclamation();
207 // public int level();
208 // public int version();
209
210 // FIXME: add mutators for above
211 // FIXME: add exception cache access?
212
213 /** On-stack replacement support */
214 // FIXME: add mutators
215 public int getOSREntryBCI() {
216 if (Assert.ASSERTS_ENABLED) {
217 Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod");
218 }
219 return getEntryBCI();
220 }
221
222 public NMethod getLink() {
223 return (NMethod) VMObjectFactory.newObject(NMethod.class, linkField.getValue(addr));
224 }
225
226 /** Tells whether frames described by this nmethod can be
227 deoptimized. Note: native wrappers cannot be deoptimized. */
228 public boolean canBeDeoptimized() { return isJavaMethod(); }
229
230 // FIXME: add inline cache support
231 // FIXME: add flush()
232
233 public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; }
234
235 // FIXME: add mark_as_seen_on_stack
236 // FIXME: add can_not_entrant_be_converted
237
238 // FIXME: add GC support
239 // void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading);
240 // void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading);
241 // void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*));
242 // void adjust_pointers();
243
244 /** Finds a PCDesc with real-pc equal to "pc" */
245 public PCDesc getPCDescAt(Address pc) {
246 // FIXME: consider adding cache like the one down in the VM
247 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
248 PCDesc pcDesc = new PCDesc(p);
249 if (pcDesc.getRealPC(this).equals(pc)) {
250 return pcDesc;
251 }
252 }
253 return null;
254 }
255
256 /** ScopeDesc for an instruction */
257 public ScopeDesc getScopeDescAt(Address pc) {
258 PCDesc pd = getPCDescAt(pc);
259 if (Assert.ASSERTS_ENABLED) {
260 Assert.that(pd != null, "scope must be present");
261 }
262 return new ScopeDesc(this, pd.getScopeDecodeOffset());
263 }
264
265 /** This is only for use by the debugging system, and is only
266 intended for use in the topmost frame, where we are not
267 guaranteed to be at a PC for which we have a PCDesc. It finds
268 the PCDesc with realPC closest to the current PC. */
269 public PCDesc getPCDescNearDbg(Address pc) {
270 PCDesc bestGuessPCDesc = null;
271 long bestDistance = 0;
272 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
273 PCDesc pcDesc = new PCDesc(p);
274 // In case pc is null
275 long distance = -pcDesc.getRealPC(this).minus(pc);
276 if ((bestGuessPCDesc == null) ||
277 ((distance >= 0) && (distance < bestDistance))) {
278 bestGuessPCDesc = pcDesc;
279 bestDistance = distance;
280 }
281 }
282 return bestGuessPCDesc;
283 }
284
285 /** This is only for use by the debugging system, and is only
286 intended for use in the topmost frame, where we are not
287 guaranteed to be at a PC for which we have a PCDesc. It finds
288 the ScopeDesc closest to the current PC. NOTE that this may
289 return NULL for compiled methods which don't have any
290 ScopeDescs! */
291 public ScopeDesc getScopeDescNearDbg(Address pc) {
292 PCDesc pd = getPCDescNearDbg(pc);
293 if (pd == null) return null;
294 return new ScopeDesc(this, pd.getScopeDecodeOffset());
295 }
296
297 public Map/*<Address, PcDesc>*/ getSafepoints() {
298 Map safepoints = new HashMap(); // Map<Address, PcDesc>
299 sun.jvm.hotspot.debugger.Address p = null;
300 for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd());
301 p = p.addOffsetTo(pcDescSize)) {
302 PCDesc pcDesc = new PCDesc(p);
303 sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this);
304 safepoints.put(pc, pcDesc);
305 }
306 return safepoints;
307 }
308
309 // FIXME: add getPCOffsetForBCI()
310 // FIXME: add embeddedOopAt()
311 // FIXME: add isDependentOn()
312 // FIXME: add isPatchableAt()
313
314 /** Support for code generation. Only here for proof-of-concept. */
315 public static int getEntryPointOffset() { return (int) entryPointField.getOffset(); }
316 public static int getVerifiedEntryPointOffset() { return (int) verifiedEntryPointField.getOffset(); }
317 public static int getOSREntryPointOffset() { return (int) osrEntryPointField.getOffset(); }
318 public static int getEntryBCIOffset() { return (int) entryBCIField.getOffset(); }
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1 /*
2 * Copyright (c) 2000, 2009, 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,
20 * CA 94065 USA or visit www.oracle.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.code;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.oops.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34 import sun.jvm.hotspot.utilities.*;
35
36 public class NMethod extends CodeBlob {
37 private static long pcDescSize;
38 private static CIntegerField zombieInstructionSizeField;
39 private static sun.jvm.hotspot.types.OopField methodField;
40 /** != InvocationEntryBci if this nmethod is an on-stack replacement method */
41 private static CIntegerField entryBCIField;
42 /** To support simple linked-list chaining of nmethods */
43 private static AddressField osrLinkField;
44 private static AddressField scavengeRootLinkField;
45 private static JByteField scavengeRootStateField;
46
47 /** Offsets for different nmethod parts */
48 private static CIntegerField exceptionOffsetField;
49 private static CIntegerField deoptOffsetField;
50 private static CIntegerField origPCOffsetField;
51 private static CIntegerField stubOffsetField;
52 private static CIntegerField scopesDataOffsetField;
53 private static CIntegerField scopesPCsOffsetField;
54 private static CIntegerField dependenciesOffsetField;
55 private static CIntegerField handlerTableOffsetField;
56 private static CIntegerField nulChkTableOffsetField;
57 private static CIntegerField nmethodEndOffsetField;
58
59 /** Offsets for entry points */
60 /** Entry point with class check */
61 private static AddressField entryPointField;
62 /** Entry point without class check */
63 private static AddressField verifiedEntryPointField;
64 /** Entry point for on stack replacement */
65 private static AddressField osrEntryPointField;
66
73 this mark to current sweep invocation count if it is seen on the
74 stack. An not_entrant method can be removed when there is no
75 more activations, i.e., when the _stack_traversal_mark is less than
76 current sweep traversal index. */
77 private static CIntegerField stackTraversalMarkField;
78
79 static {
80 VM.registerVMInitializedObserver(new Observer() {
81 public void update(Observable o, Object data) {
82 initialize(VM.getVM().getTypeDataBase());
83 }
84 });
85 }
86
87 private static void initialize(TypeDataBase db) {
88 Type type = db.lookupType("nmethod");
89
90 zombieInstructionSizeField = type.getCIntegerField("_zombie_instruction_size");
91 methodField = type.getOopField("_method");
92 entryBCIField = type.getCIntegerField("_entry_bci");
93 osrLinkField = type.getAddressField("_osr_link");
94 scavengeRootLinkField = type.getAddressField("_scavenge_root_link");
95 scavengeRootStateField = type.getJByteField("_scavenge_root_state");
96
97 exceptionOffsetField = type.getCIntegerField("_exception_offset");
98 deoptOffsetField = type.getCIntegerField("_deoptimize_offset");
99 origPCOffsetField = type.getCIntegerField("_orig_pc_offset");
100 stubOffsetField = type.getCIntegerField("_stub_offset");
101 scopesDataOffsetField = type.getCIntegerField("_scopes_data_offset");
102 scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset");
103 dependenciesOffsetField = type.getCIntegerField("_dependencies_offset");
104 handlerTableOffsetField = type.getCIntegerField("_handler_table_offset");
105 nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset");
106 nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset");
107 entryPointField = type.getAddressField("_entry_point");
108 verifiedEntryPointField = type.getAddressField("_verified_entry_point");
109 osrEntryPointField = type.getAddressField("_osr_entry_point");
110 lockCountField = type.getJIntField("_lock_count");
111 stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark");
112
113 pcDescSize = db.lookupType("PcDesc").getSize();
114 }
115
116 public NMethod(Address addr) {
208 // public boolean isOld();
209 // public int age();
210 // public boolean isMarkedForDeoptimization();
211 // public boolean isMarkedForUnloading();
212 // public boolean isMarkedForReclamation();
213 // public int level();
214 // public int version();
215
216 // FIXME: add mutators for above
217 // FIXME: add exception cache access?
218
219 /** On-stack replacement support */
220 // FIXME: add mutators
221 public int getOSREntryBCI() {
222 if (Assert.ASSERTS_ENABLED) {
223 Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod");
224 }
225 return getEntryBCI();
226 }
227
228 public NMethod getOSRLink() {
229 return (NMethod) VMObjectFactory.newObject(NMethod.class, osrLinkField.getValue(addr));
230 }
231
232 public NMethod getScavengeRootLink() {
233 return (NMethod) VMObjectFactory.newObject(NMethod.class, scavengeRootLinkField.getValue(addr));
234 }
235
236 public int getScavengeRootState() {
237 return (int) scavengeRootStateField.getValue(addr);
238 }
239
240
241 /** Tells whether frames described by this nmethod can be
242 deoptimized. Note: native wrappers cannot be deoptimized. */
243 public boolean canBeDeoptimized() { return isJavaMethod(); }
244
245 // FIXME: add inline cache support
246 // FIXME: add flush()
247
248 public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; }
249
250 // FIXME: add mark_as_seen_on_stack
251 // FIXME: add can_not_entrant_be_converted
252
253 // FIXME: add GC support
254 // void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading);
255 // void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading);
256 // void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*));
257 // void adjust_pointers();
258
259 /** Finds a PCDesc with real-pc equal to "pc" */
260 public PCDesc getPCDescAt(Address pc) {
261 // FIXME: consider adding cache like the one down in the VM
262 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
263 PCDesc pcDesc = new PCDesc(p);
264 if (pcDesc.getRealPC(this).equals(pc)) {
265 return pcDesc;
266 }
267 }
268 return null;
269 }
270
271 /** ScopeDesc for an instruction */
272 public ScopeDesc getScopeDescAt(Address pc) {
273 PCDesc pd = getPCDescAt(pc);
274 if (Assert.ASSERTS_ENABLED) {
275 Assert.that(pd != null, "scope must be present");
276 }
277 return new ScopeDesc(this, pd.getScopeDecodeOffset(), pd.getObjDecodeOffset(), pd.getReexecute());
278 }
279
280 /** This is only for use by the debugging system, and is only
281 intended for use in the topmost frame, where we are not
282 guaranteed to be at a PC for which we have a PCDesc. It finds
283 the PCDesc with realPC closest to the current PC. */
284 public PCDesc getPCDescNearDbg(Address pc) {
285 PCDesc bestGuessPCDesc = null;
286 long bestDistance = 0;
287 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) {
288 PCDesc pcDesc = new PCDesc(p);
289 // In case pc is null
290 long distance = -pcDesc.getRealPC(this).minus(pc);
291 if ((bestGuessPCDesc == null) ||
292 ((distance >= 0) && (distance < bestDistance))) {
293 bestGuessPCDesc = pcDesc;
294 bestDistance = distance;
295 }
296 }
297 return bestGuessPCDesc;
298 }
299
300 /** This is only for use by the debugging system, and is only
301 intended for use in the topmost frame, where we are not
302 guaranteed to be at a PC for which we have a PCDesc. It finds
303 the ScopeDesc closest to the current PC. NOTE that this may
304 return NULL for compiled methods which don't have any
305 ScopeDescs! */
306 public ScopeDesc getScopeDescNearDbg(Address pc) {
307 PCDesc pd = getPCDescNearDbg(pc);
308 if (pd == null) return null;
309 return new ScopeDesc(this, pd.getScopeDecodeOffset(), pd.getObjDecodeOffset(), pd.getReexecute());
310 }
311
312 public Map/*<Address, PCDesc>*/ getSafepoints() {
313 Map safepoints = new HashMap(); // Map<Address, PCDesc>
314 sun.jvm.hotspot.debugger.Address p = null;
315 for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd());
316 p = p.addOffsetTo(pcDescSize)) {
317 PCDesc pcDesc = new PCDesc(p);
318 sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this);
319 safepoints.put(pc, pcDesc);
320 }
321 return safepoints;
322 }
323
324 // FIXME: add getPCOffsetForBCI()
325 // FIXME: add embeddedOopAt()
326 // FIXME: add isDependentOn()
327 // FIXME: add isPatchableAt()
328
329 /** Support for code generation. Only here for proof-of-concept. */
330 public static int getEntryPointOffset() { return (int) entryPointField.getOffset(); }
331 public static int getVerifiedEntryPointOffset() { return (int) verifiedEntryPointField.getOffset(); }
332 public static int getOSREntryPointOffset() { return (int) osrEntryPointField.getOffset(); }
333 public static int getEntryBCIOffset() { return (int) entryBCIField.getOffset(); }
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