1 /*
2 * Copyright (c) 1999, 2023, 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 #ifndef SHARE_C1_C1_IR_HPP
26 #define SHARE_C1_C1_IR_HPP
27
28 #include "c1/c1_Instruction.hpp"
29 #include "ci/ciExceptionHandler.hpp"
30 #include "ci/ciMethod.hpp"
31 #include "ci/ciStreams.hpp"
32 #include "memory/allocation.hpp"
33
34 // An XHandler is a C1 internal description for an exception handler
35
36 class XHandler: public CompilationResourceObj {
37 private:
38 ciExceptionHandler* _desc;
39
40 BlockBegin* _entry_block; // Entry block of xhandler
41 LIR_List* _entry_code; // LIR-operations that must be executed before jumping to entry_block
42 int _entry_pco; // pco where entry_code (or entry_block if no entry_code) starts
43 int _phi_operand; // For resolving of phi functions at begin of entry_block
44 int _scope_count; // for filling ExceptionRangeEntry::scope_count
45
46 #ifdef ASSERT
47 int _lir_op_id; // op_id of the LIR-operation throwing to this handler
48 #endif
49
50 public:
51 // creation
52 XHandler(ciExceptionHandler* desc)
53 : _desc(desc)
54 , _entry_block(nullptr)
55 , _entry_code(nullptr)
56 , _entry_pco(-1)
57 , _phi_operand(-1)
58 , _scope_count(-1)
59 #ifdef ASSERT
60 , _lir_op_id(-1)
61 #endif
62 { }
63
64 XHandler(XHandler* other)
65 : _desc(other->_desc)
66 , _entry_block(other->_entry_block)
67 , _entry_code(other->_entry_code)
68 , _entry_pco(other->_entry_pco)
69 , _phi_operand(other->_phi_operand)
70 , _scope_count(other->_scope_count)
71 #ifdef ASSERT
72 , _lir_op_id(other->_lir_op_id)
73 #endif
74 { }
75
76 // accessors for data of ciExceptionHandler
77 int beg_bci() const { return _desc->start(); }
78 int end_bci() const { return _desc->limit(); }
79 int handler_bci() const { return _desc->handler_bci(); }
80 bool is_catch_all() const { return _desc->is_catch_all(); }
81 int catch_type() const { return _desc->catch_klass_index(); }
82 ciInstanceKlass* catch_klass() const { return _desc->catch_klass(); }
83 bool covers(int bci) const { return beg_bci() <= bci && bci < end_bci(); }
84
85 // accessors for additional fields
86 BlockBegin* entry_block() const { return _entry_block; }
87 LIR_List* entry_code() const { return _entry_code; }
88 int entry_pco() const { return _entry_pco; }
89 int phi_operand() const { assert(_phi_operand != -1, "not set"); return _phi_operand; }
90 int scope_count() const { assert(_scope_count != -1, "not set"); return _scope_count; }
91 DEBUG_ONLY(int lir_op_id() const { return _lir_op_id; });
92
93 void set_entry_block(BlockBegin* entry_block) {
94 assert(entry_block->is_set(BlockBegin::exception_entry_flag), "must be an exception handler entry");
95 assert(entry_block->bci() == handler_bci(), "bci's must correspond");
96 _entry_block = entry_block;
97 }
98 void set_entry_code(LIR_List* entry_code) { _entry_code = entry_code; }
99 void set_entry_pco(int entry_pco) { _entry_pco = entry_pco; }
100 void set_phi_operand(int phi_operand) { _phi_operand = phi_operand; }
101 void set_scope_count(int scope_count) { _scope_count = scope_count; }
102 DEBUG_ONLY(void set_lir_op_id(int lir_op_id) { _lir_op_id = lir_op_id; });
103
104 bool equals(XHandler* other) const;
105 };
106
107 typedef GrowableArray<XHandler*> _XHandlerList;
108
109 // XHandlers is the C1 internal list of exception handlers for a method
110 class XHandlers: public CompilationResourceObj {
111 private:
112 _XHandlerList _list;
113
114 public:
115 // creation
116 XHandlers() : _list() { }
117 XHandlers(ciMethod* method);
118 XHandlers(XHandlers* other);
119
120 // accessors
121 int length() const { return _list.length(); }
122 XHandler* handler_at(int i) const { return _list.at(i); }
123 bool has_handlers() const { return _list.length() > 0; }
124 void append(XHandler* h) { _list.append(h); }
125 XHandler* remove_last() { return _list.pop(); }
126
127 bool could_catch(ciInstanceKlass* klass, bool type_is_exact) const;
128 bool equals(XHandlers* others) const;
129 };
130
131
132 class IRScope;
133 typedef GrowableArray<IRScope*> IRScopeList;
134
135 class Compilation;
136 class IRScope: public CompilationResourceObj {
137 private:
138 // hierarchy
139 Compilation* _compilation; // the current compilation
140 IRScope* _caller; // the caller scope, or null
141 int _level; // the inlining level
142 ciMethod* _method; // the corresponding method
143 IRScopeList _callees; // the inlined method scopes
144
145 // graph
146 XHandlers* _xhandlers; // the exception handlers
147 int _number_of_locks; // the number of monitor lock slots needed
148 bool _monitor_pairing_ok; // the monitor pairing info
149 bool _wrote_final; // has written final field
150 bool _wrote_fields; // has written fields
151 bool _wrote_volatile; // has written volatile field
152 bool _wrote_stable; // has written @Stable field
153 BlockBegin* _start; // the start block, successsors are method entries
154
155 ResourceBitMap _requires_phi_function; // bit is set if phi functions at loop headers are necessary for a local variable
156
157 // helper functions
158 BlockBegin* build_graph(Compilation* compilation, int osr_bci);
159
160 public:
161 // creation
162 IRScope(Compilation* compilation, IRScope* caller, int caller_bci, ciMethod* method, int osr_bci, bool create_graph = false);
163
164 // accessors
165 Compilation* compilation() const { return _compilation; }
166 IRScope* caller() const { return _caller; }
167 int level() const { return _level; }
168 ciMethod* method() const { return _method; }
169 int max_stack() const; // NOTE: expensive
170 BitMap& requires_phi_function() { return _requires_phi_function; }
171
172 // hierarchy
173 bool is_top_scope() const { return _caller == nullptr; }
174 void add_callee(IRScope* callee) { _callees.append(callee); }
175 int number_of_callees() const { return _callees.length(); }
176 IRScope* callee_no(int i) const { return _callees.at(i); }
177
178 // accessors, graph
179 bool is_valid() const { return start() != nullptr; }
180 XHandlers* xhandlers() const { return _xhandlers; }
181 int number_of_locks() const { return _number_of_locks; }
182 void set_min_number_of_locks(int n) { if (n > _number_of_locks) _number_of_locks = n; }
183 bool monitor_pairing_ok() const { return _monitor_pairing_ok; }
184 BlockBegin* start() const { return _start; }
185 void set_wrote_final() { _wrote_final = true; }
186 bool wrote_final () const { return _wrote_final; }
187 void set_wrote_fields() { _wrote_fields = true; }
188 bool wrote_fields () const { return _wrote_fields; }
189 void set_wrote_volatile() { _wrote_volatile = true; }
190 bool wrote_volatile () const { return _wrote_volatile; }
191 void set_wrote_stable() { _wrote_stable = true; }
192 bool wrote_stable() const { return _wrote_stable; }
193 };
194
195
196 //
197 // IRScopeDebugInfo records the debug information for a particular IRScope
198 // in a particular CodeEmitInfo. This allows the information to be computed
199 // once early enough for the OopMap to be available to the LIR and also to be
200 // reemited for different pcs using the same CodeEmitInfo without recomputing
201 // everything.
202 //
203
204 class IRScopeDebugInfo: public CompilationResourceObj {
205 private:
206 IRScope* _scope;
207 int _bci;
208 GrowableArray<ScopeValue*>* _locals;
209 GrowableArray<ScopeValue*>* _expressions;
210 GrowableArray<MonitorValue*>* _monitors;
211 IRScopeDebugInfo* _caller;
212
213 public:
214 IRScopeDebugInfo(IRScope* scope,
215 int bci,
216 GrowableArray<ScopeValue*>* locals,
217 GrowableArray<ScopeValue*>* expressions,
218 GrowableArray<MonitorValue*>* monitors,
219 IRScopeDebugInfo* caller):
220 _scope(scope)
221 , _bci(bci)
222 , _locals(locals)
223 , _expressions(expressions)
224 , _monitors(monitors)
225 , _caller(caller) {}
226
227
228 IRScope* scope() { return _scope; }
229 int bci() { return _bci; }
230 GrowableArray<ScopeValue*>* locals() { return _locals; }
231 GrowableArray<ScopeValue*>* expressions() { return _expressions; }
232 GrowableArray<MonitorValue*>* monitors() { return _monitors; }
233 IRScopeDebugInfo* caller() { return _caller; }
234
235 //Whether we should reexecute this bytecode for deopt
236 bool should_reexecute();
237
238 void record_debug_info(DebugInformationRecorder* recorder, int pc_offset, bool reexecute, bool is_method_handle_invoke = false) {
239 if (caller() != nullptr) {
240 // Order is significant: Must record caller first.
241 caller()->record_debug_info(recorder, pc_offset, false/*reexecute*/);
242 }
243 DebugToken* locvals = recorder->create_scope_values(locals());
244 DebugToken* expvals = recorder->create_scope_values(expressions());
245 DebugToken* monvals = recorder->create_monitor_values(monitors());
246 // reexecute allowed only for the topmost frame
247 bool return_oop = false; // This flag will be ignored since it used only for C2 with escape analysis.
248 bool rethrow_exception = false;
249 bool has_ea_local_in_scope = false;
250 bool arg_escape = false;
251 recorder->describe_scope(pc_offset, methodHandle(), scope()->method(), bci(),
252 reexecute, rethrow_exception, is_method_handle_invoke, return_oop,
253 has_ea_local_in_scope, arg_escape, locvals, expvals, monvals);
254 }
255 };
256
257
258 class CodeEmitInfo: public CompilationResourceObj {
259 friend class LinearScan;
260 private:
261 IRScopeDebugInfo* _scope_debug_info;
262 IRScope* _scope;
263 XHandlers* _exception_handlers;
264 OopMap* _oop_map;
265 ValueStack* _stack; // used by deoptimization (contains also monitors
266 bool _is_method_handle_invoke; // true if the associated call site is a MethodHandle call site.
267 bool _deoptimize_on_exception;
268 bool _force_reexecute; // force the reexecute flag on, used for patching stub
269
270 FrameMap* frame_map() const { return scope()->compilation()->frame_map(); }
271 Compilation* compilation() const { return scope()->compilation(); }
272
273 public:
274
275 // use scope from ValueStack
276 CodeEmitInfo(ValueStack* stack, XHandlers* exception_handlers, bool deoptimize_on_exception = false);
277
278 // make a copy
279 CodeEmitInfo(CodeEmitInfo* info, ValueStack* stack = nullptr);
280
281 // accessors
282 OopMap* oop_map() { return _oop_map; }
283 ciMethod* method() const { return _scope->method(); }
284 IRScope* scope() const { return _scope; }
285 XHandlers* exception_handlers() const { return _exception_handlers; }
286 ValueStack* stack() const { return _stack; }
287 bool deoptimize_on_exception() const { return _deoptimize_on_exception; }
288
289 void add_register_oop(LIR_Opr opr);
290 void record_debug_info(DebugInformationRecorder* recorder, int pc_offset);
291
292 bool is_method_handle_invoke() const { return _is_method_handle_invoke; }
293 void set_is_method_handle_invoke(bool x) { _is_method_handle_invoke = x; }
294
295 bool force_reexecute() const { return _force_reexecute; }
296 void set_force_reexecute() { _force_reexecute = true; }
297
298 int interpreter_frame_size() const;
299
300 };
301
302
303 class IR: public CompilationResourceObj {
304 private:
305 Compilation* _compilation; // the current compilation
306 IRScope* _top_scope; // the root of the scope hierarchy
307 int _num_loops; // Total number of loops
308 BlockList* _code; // the blocks in code generation order w/ use counts
309
310 public:
311 // creation
312 IR(Compilation* compilation, ciMethod* method, int osr_bci);
313
314 // accessors
315 bool is_valid() const { return top_scope()->is_valid(); }
316 Compilation* compilation() const { return _compilation; }
317 IRScope* top_scope() const { return _top_scope; }
318 int number_of_locks() const { return top_scope()->number_of_locks(); }
319 ciMethod* method() const { return top_scope()->method(); }
320 BlockBegin* start() const { return top_scope()->start(); }
321 BlockBegin* std_entry() const { return start()->end()->as_Base()->std_entry(); }
322 BlockBegin* osr_entry() const { return start()->end()->as_Base()->osr_entry(); }
323 BlockList* code() const { return _code; }
324 int num_loops() const { return _num_loops; }
325 int max_stack() const { return top_scope()->max_stack(); } // expensive
326
327 // ir manipulation
328 void optimize_blocks();
329 void eliminate_null_checks();
330 void compute_predecessors();
331 void split_critical_edges();
332 void compute_code();
333 void compute_use_counts();
334
335 // The linear-scan order and the code emission order are equal, but
336 // this may change in future
337 BlockList* linear_scan_order() { assert(_code != nullptr, "not computed"); return _code; }
338
339 // iteration
340 void iterate_preorder (BlockClosure* closure);
341 void iterate_postorder (BlockClosure* closure);
342 void iterate_linear_scan_order(BlockClosure* closure);
343
344 // debugging
345 static void print(BlockBegin* start, bool cfg_only, bool live_only = false) PRODUCT_RETURN;
346 void print(bool cfg_only, bool live_only = false) PRODUCT_RETURN;
347
348 void expand_with_neighborhood(BlockList& blocks) NOT_DEBUG_RETURN;
349 void verify_local(BlockList&) NOT_DEBUG_RETURN;
350 void verify() NOT_DEBUG_RETURN;
351 };
352
353
354 // Globally do instruction substitution and remove substituted
355 // instructions from the instruction list.
356 //
357
358 class SubstitutionResolver: public BlockClosure, ValueVisitor {
359 virtual void visit(Value* v);
360
361 public:
362 SubstitutionResolver(IR* hir) {
363 hir->iterate_preorder(this);
364 }
365
366 SubstitutionResolver(BlockBegin* block) {
367 block->iterate_preorder(this);
368 }
369
370 virtual void block_do(BlockBegin* block);
371 };
372
373 #endif // SHARE_C1_C1_IR_HPP