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 CIntegerField 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;
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.getCIntegerField("_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
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.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.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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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;
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
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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