Tue, 01 Jul 2014 09:03:55 +0200
8047362: Add a version of CompiledIC_at that doesn't create a new RelocIterator
Reviewed-by: iveresov, mgerdin
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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25 #ifndef SHARE_VM_CODE_COMPILEDIC_HPP
26 #define SHARE_VM_CODE_COMPILEDIC_HPP
28 #include "interpreter/linkResolver.hpp"
29 #include "oops/compiledICHolder.hpp"
30 #ifdef TARGET_ARCH_x86
31 # include "nativeInst_x86.hpp"
32 #endif
33 #ifdef TARGET_ARCH_sparc
34 # include "nativeInst_sparc.hpp"
35 #endif
36 #ifdef TARGET_ARCH_zero
37 # include "nativeInst_zero.hpp"
38 #endif
39 #ifdef TARGET_ARCH_arm
40 # include "nativeInst_arm.hpp"
41 #endif
42 #ifdef TARGET_ARCH_ppc
43 # include "nativeInst_ppc.hpp"
44 #endif
46 //-----------------------------------------------------------------------------
47 // The CompiledIC represents a compiled inline cache.
48 //
49 // In order to make patching of the inline cache MT-safe, we only allow the following
50 // transitions (when not at a safepoint):
51 //
52 //
53 // [1] --<-- Clean -->--- [1]
54 // / (null) \
55 // / \ /-<-\
56 // / [2] \ / \
57 // Interpreted ---------> Monomorphic | [3]
58 // (CompiledICHolder*) (Klass*) |
59 // \ / \ /
60 // [4] \ / [4] \->-/
61 // \->- Megamorphic -<-/
62 // (Method*)
63 //
64 // The text in paranteses () refere to the value of the inline cache receiver (mov instruction)
65 //
66 // The numbers in square brackets refere to the kind of transition:
67 // [1]: Initial fixup. Receiver it found from debug information
68 // [2]: Compilation of a method
69 // [3]: Recompilation of a method (note: only entry is changed. The Klass* must stay the same)
70 // [4]: Inline cache miss. We go directly to megamorphic call.
71 //
72 // The class automatically inserts transition stubs (using the InlineCacheBuffer) when an MT-unsafe
73 // transition is made to a stub.
74 //
75 class CompiledIC;
76 class ICStub;
78 class CompiledICInfo : public StackObj {
79 private:
80 address _entry; // entry point for call
81 void* _cached_value; // Value of cached_value (either in stub or inline cache)
82 bool _is_icholder; // Is the cached value a CompiledICHolder*
83 bool _is_optimized; // it is an optimized virtual call (i.e., can be statically bound)
84 bool _to_interpreter; // Call it to interpreter
85 bool _release_icholder;
86 public:
87 address entry() const { return _entry; }
88 Metadata* cached_metadata() const { assert(!_is_icholder, ""); return (Metadata*)_cached_value; }
89 CompiledICHolder* claim_cached_icholder() {
90 assert(_is_icholder, "");
91 assert(_cached_value != NULL, "must be non-NULL");
92 _release_icholder = false;
93 CompiledICHolder* icholder = (CompiledICHolder*)_cached_value;
94 icholder->claim();
95 return icholder;
96 }
97 bool is_optimized() const { return _is_optimized; }
98 bool to_interpreter() const { return _to_interpreter; }
100 void set_compiled_entry(address entry, Klass* klass, bool is_optimized) {
101 _entry = entry;
102 _cached_value = (void*)klass;
103 _to_interpreter = false;
104 _is_icholder = false;
105 _is_optimized = is_optimized;
106 _release_icholder = false;
107 }
109 void set_interpreter_entry(address entry, Method* method) {
110 _entry = entry;
111 _cached_value = (void*)method;
112 _to_interpreter = true;
113 _is_icholder = false;
114 _is_optimized = true;
115 _release_icholder = false;
116 }
118 void set_icholder_entry(address entry, CompiledICHolder* icholder) {
119 _entry = entry;
120 _cached_value = (void*)icholder;
121 _to_interpreter = true;
122 _is_icholder = true;
123 _is_optimized = false;
124 _release_icholder = true;
125 }
127 CompiledICInfo(): _entry(NULL), _cached_value(NULL), _is_icholder(false),
128 _to_interpreter(false), _is_optimized(false), _release_icholder(false) {
129 }
130 ~CompiledICInfo() {
131 // In rare cases the info is computed but not used, so release any
132 // CompiledICHolder* that was created
133 if (_release_icholder) {
134 assert(_is_icholder, "must be");
135 CompiledICHolder* icholder = (CompiledICHolder*)_cached_value;
136 icholder->claim();
137 delete icholder;
138 }
139 }
140 };
142 class CompiledIC: public ResourceObj {
143 friend class InlineCacheBuffer;
144 friend class ICStub;
147 private:
148 NativeCall* _ic_call; // the call instruction
149 NativeMovConstReg* _value; // patchable value cell for this IC
150 bool _is_optimized; // an optimized virtual call (i.e., no compiled IC)
152 CompiledIC(nmethod* nm, NativeCall* ic_call);
153 CompiledIC(RelocIterator* iter);
155 void initialize_from_iter(RelocIterator* iter);
157 static bool is_icholder_entry(address entry);
159 // low-level inline-cache manipulation. Cannot be accessed directly, since it might not be MT-safe
160 // to change an inline-cache. These changes the underlying inline-cache directly. They *newer* make
161 // changes to a transition stub.
162 void internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder);
163 void set_ic_destination(ICStub* stub);
164 void set_ic_destination(address entry_point) {
165 assert(_is_optimized, "use set_ic_destination_and_value instead");
166 internal_set_ic_destination(entry_point, false, NULL, false);
167 }
168 // This only for use by ICStubs where the type of the value isn't known
169 void set_ic_destination_and_value(address entry_point, void* value) {
170 internal_set_ic_destination(entry_point, false, value, is_icholder_entry(entry_point));
171 }
172 void set_ic_destination_and_value(address entry_point, Metadata* value) {
173 internal_set_ic_destination(entry_point, false, value, false);
174 }
175 void set_ic_destination_and_value(address entry_point, CompiledICHolder* value) {
176 internal_set_ic_destination(entry_point, false, value, true);
177 }
179 // Reads the location of the transition stub. This will fail with an assertion, if no transition stub is
180 // associated with the inline cache.
181 address stub_address() const;
182 bool is_in_transition_state() const; // Use InlineCacheBuffer
184 public:
185 // conversion (machine PC to CompiledIC*)
186 friend CompiledIC* CompiledIC_before(nmethod* nm, address return_addr);
187 friend CompiledIC* CompiledIC_at(nmethod* nm, address call_site);
188 friend CompiledIC* CompiledIC_at(Relocation* call_site);
189 friend CompiledIC* CompiledIC_at(RelocIterator* reloc_iter);
191 // This is used to release CompiledICHolder*s from nmethods that
192 // are about to be freed. The callsite might contain other stale
193 // values of other kinds so it must be careful.
194 static void cleanup_call_site(virtual_call_Relocation* call_site);
195 static bool is_icholder_call_site(virtual_call_Relocation* call_site);
197 // Return the cached_metadata/destination associated with this inline cache. If the cache currently points
198 // to a transition stub, it will read the values from the transition stub.
199 void* cached_value() const;
200 CompiledICHolder* cached_icholder() const {
201 assert(is_icholder_call(), "must be");
202 return (CompiledICHolder*) cached_value();
203 }
204 Metadata* cached_metadata() const {
205 assert(!is_icholder_call(), "must be");
206 return (Metadata*) cached_value();
207 }
209 address ic_destination() const;
211 bool is_optimized() const { return _is_optimized; }
213 // State
214 bool is_clean() const;
215 bool is_megamorphic() const;
216 bool is_call_to_compiled() const;
217 bool is_call_to_interpreted() const;
219 bool is_icholder_call() const;
221 address end_of_call() { return _ic_call->return_address(); }
223 // MT-safe patching of inline caches. Note: Only safe to call is_xxx when holding the CompiledIC_ock
224 // so you are guaranteed that no patching takes place. The same goes for verify.
225 //
226 // Note: We do not provide any direct access to the stub code, to prevent parts of the code
227 // to manipulate the inline cache in MT-unsafe ways.
228 //
229 // They all takes a TRAP argument, since they can cause a GC if the inline-cache buffer is full.
230 //
231 void set_to_clean(); // Can only be called during a safepoint operation
232 void set_to_monomorphic(CompiledICInfo& info);
234 // Returns true if successful and false otherwise. The call can fail if memory
235 // allocation in the code cache fails.
236 bool set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS);
238 static void compute_monomorphic_entry(methodHandle method, KlassHandle receiver_klass,
239 bool is_optimized, bool static_bound, CompiledICInfo& info, TRAPS);
241 // Location
242 address instruction_address() const { return _ic_call->instruction_address(); }
244 // Misc
245 void print() PRODUCT_RETURN;
246 void print_compiled_ic() PRODUCT_RETURN;
247 void verify() PRODUCT_RETURN;
248 };
250 inline CompiledIC* CompiledIC_before(nmethod* nm, address return_addr) {
251 CompiledIC* c_ic = new CompiledIC(nm, nativeCall_before(return_addr));
252 c_ic->verify();
253 return c_ic;
254 }
256 inline CompiledIC* CompiledIC_at(nmethod* nm, address call_site) {
257 CompiledIC* c_ic = new CompiledIC(nm, nativeCall_at(call_site));
258 c_ic->verify();
259 return c_ic;
260 }
262 inline CompiledIC* CompiledIC_at(Relocation* call_site) {
263 assert(call_site->type() == relocInfo::virtual_call_type ||
264 call_site->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info");
265 CompiledIC* c_ic = new CompiledIC(call_site->code(), nativeCall_at(call_site->addr()));
266 c_ic->verify();
267 return c_ic;
268 }
270 inline CompiledIC* CompiledIC_at(RelocIterator* reloc_iter) {
271 assert(reloc_iter->type() == relocInfo::virtual_call_type ||
272 reloc_iter->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info");
273 CompiledIC* c_ic = new CompiledIC(reloc_iter);
274 c_ic->verify();
275 return c_ic;
276 }
278 //-----------------------------------------------------------------------------
279 // The CompiledStaticCall represents a call to a static method in the compiled
280 //
281 // Transition diagram of a static call site is somewhat simpler than for an inlined cache:
282 //
283 //
284 // -----<----- Clean ----->-----
285 // / \
286 // / \
287 // compilled code <------------> interpreted code
288 //
289 // Clean: Calls directly to runtime method for fixup
290 // Compiled code: Calls directly to compiled code
291 // Interpreted code: Calls to stub that set Method* reference
292 //
293 //
294 class CompiledStaticCall;
296 class StaticCallInfo {
297 private:
298 address _entry; // Entrypoint
299 methodHandle _callee; // Callee (used when calling interpreter)
300 bool _to_interpreter; // call to interpreted method (otherwise compiled)
302 friend class CompiledStaticCall;
303 public:
304 address entry() const { return _entry; }
305 methodHandle callee() const { return _callee; }
306 };
309 class CompiledStaticCall: public NativeCall {
310 friend class CompiledIC;
312 // Also used by CompiledIC
313 void set_to_interpreted(methodHandle callee, address entry);
314 bool is_optimized_virtual();
316 public:
317 friend CompiledStaticCall* compiledStaticCall_before(address return_addr);
318 friend CompiledStaticCall* compiledStaticCall_at(address native_call);
319 friend CompiledStaticCall* compiledStaticCall_at(Relocation* call_site);
321 // Code
322 static void emit_to_interp_stub(CodeBuffer &cbuf);
323 static int to_interp_stub_size();
324 static int reloc_to_interp_stub();
326 // State
327 bool is_clean() const;
328 bool is_call_to_compiled() const;
329 bool is_call_to_interpreted() const;
331 // Clean static call (will force resolving on next use)
332 void set_to_clean();
334 // Set state. The entry must be the same, as computed by compute_entry.
335 // Computation and setting is split up, since the actions are separate during
336 // a OptoRuntime::resolve_xxx.
337 void set(const StaticCallInfo& info);
339 // Compute entry point given a method
340 static void compute_entry(methodHandle m, StaticCallInfo& info);
342 // Stub support
343 address find_stub();
344 static void set_stub_to_clean(static_stub_Relocation* static_stub);
346 // Misc.
347 void print() PRODUCT_RETURN;
348 void verify() PRODUCT_RETURN;
349 };
352 inline CompiledStaticCall* compiledStaticCall_before(address return_addr) {
353 CompiledStaticCall* st = (CompiledStaticCall*)nativeCall_before(return_addr);
354 st->verify();
355 return st;
356 }
358 inline CompiledStaticCall* compiledStaticCall_at(address native_call) {
359 CompiledStaticCall* st = (CompiledStaticCall*)native_call;
360 st->verify();
361 return st;
362 }
364 inline CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) {
365 return compiledStaticCall_at(call_site->addr());
366 }
368 #endif // SHARE_VM_CODE_COMPILEDIC_HPP