1 /*
2 * Copyright (c) 1999, 2019, 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.
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23 */
24
25 #ifndef SHARE_C1_C1_GRAPHBUILDER_HPP
26 #define SHARE_C1_C1_GRAPHBUILDER_HPP
27
28 #include "c1/c1_IR.hpp"
29 #include "c1/c1_Instruction.hpp"
30 #include "c1/c1_ValueMap.hpp"
31 #include "c1/c1_ValueStack.hpp"
32 #include "ci/ciMethodData.hpp"
33 #include "ci/ciStreams.hpp"
34 #include "compiler/compileLog.hpp"
35
36 class MemoryBuffer;
37
38 class GraphBuilder {
39 private:
40 // Per-scope data. These are pushed and popped as we descend into
41 // inlined methods. Currently in order to generate good code in the
42 // inliner we have to attempt to inline methods directly into the
43 // basic block we are parsing; this adds complexity.
44 class ScopeData: public CompilationResourceObj {
45 private:
46 ScopeData* _parent;
47 // bci-to-block mapping
48 BlockList* _bci2block;
49 // Scope
50 IRScope* _scope;
51 // Whether this scope or any parent scope has exception handlers
52 bool _has_handler;
53 // The bytecodes
54 ciBytecodeStream* _stream;
55
56 // Work list
57 BlockList* _work_list;
58
59 // Maximum inline size for this scope
60 intx _max_inline_size;
61 // Expression stack depth at point where inline occurred
62 int _caller_stack_size;
63
64 // The continuation point for the inline. Currently only used in
65 // multi-block inlines, but eventually would like to use this for
66 // all inlines for uniformity and simplicity; in this case would
67 // get the continuation point from the BlockList instead of
68 // fabricating it anew because Invokes would be considered to be
69 // BlockEnds.
70 BlockBegin* _continuation;
71
72 // Was this ScopeData created only for the parsing and inlining of
73 // a jsr?
74 bool _parsing_jsr;
75 // We track the destination bci of the jsr only to determine
76 // bailout conditions, since we only handle a subset of all of the
77 // possible jsr-ret control structures. Recursive invocations of a
78 // jsr are disallowed by the verifier.
79 int _jsr_entry_bci;
80 // We need to track the local variable in which the return address
81 // was stored to ensure we can handle inlining the jsr, because we
82 // don't handle arbitrary jsr/ret constructs.
83 int _jsr_ret_addr_local;
84 // If we are parsing a jsr, the continuation point for rets
85 BlockBegin* _jsr_continuation;
86 // Cloned XHandlers for jsr-related ScopeDatas
87 XHandlers* _jsr_xhandlers;
88
89 // Number of returns seen in this scope
90 int _num_returns;
91
92 // In order to generate profitable code for inlining, we currently
93 // have to perform an optimization for single-block inlined
94 // methods where we continue parsing into the same block. This
95 // allows us to perform CSE across inlined scopes and to avoid
96 // storing parameters to the stack. Having a global register
97 // allocator and being able to perform global CSE would allow this
98 // code to be removed and thereby simplify the inliner.
99 BlockBegin* _cleanup_block; // The block to which the return was added
100 Instruction* _cleanup_return_prev; // Instruction before return instruction
101 ValueStack* _cleanup_state; // State of that block (not yet pinned)
102
103 // When inlining do not push the result on the stack
104 bool _ignore_return;
105
106 public:
107 ScopeData(ScopeData* parent);
108
109 ScopeData* parent() const { return _parent; }
110
111 BlockList* bci2block() const { return _bci2block; }
112 void set_bci2block(BlockList* bci2block) { _bci2block = bci2block; }
113
114 // NOTE: this has a different effect when parsing jsrs
115 BlockBegin* block_at(int bci);
116
117 IRScope* scope() const { return _scope; }
118 // Has side-effect of setting has_handler flag
119 void set_scope(IRScope* scope);
120
121 // Whether this or any parent scope has exception handlers
122 bool has_handler() const { return _has_handler; }
123 void set_has_handler() { _has_handler = true; }
124
125 // Exception handlers list to be used for this scope
126 XHandlers* xhandlers() const;
127
128 // How to get a block to be parsed
129 void add_to_work_list(BlockBegin* block);
130 // How to remove the next block to be parsed; returns NULL if none left
131 BlockBegin* remove_from_work_list();
132 // Indicates parse is over
133 bool is_work_list_empty() const;
134
135 ciBytecodeStream* stream() { return _stream; }
136 void set_stream(ciBytecodeStream* stream) { _stream = stream; }
137
138 intx max_inline_size() const { return _max_inline_size; }
139
140 BlockBegin* continuation() const { return _continuation; }
141 void set_continuation(BlockBegin* cont) { _continuation = cont; }
142
143 // Indicates whether this ScopeData was pushed only for the
144 // parsing and inlining of a jsr
145 bool parsing_jsr() const { return _parsing_jsr; }
146 void set_parsing_jsr() { _parsing_jsr = true; }
147 int jsr_entry_bci() const { return _jsr_entry_bci; }
148 void set_jsr_entry_bci(int bci) { _jsr_entry_bci = bci; }
149 void set_jsr_return_address_local(int local_no){ _jsr_ret_addr_local = local_no; }
150 int jsr_return_address_local() const { return _jsr_ret_addr_local; }
151 // Must be called after scope is set up for jsr ScopeData
152 void setup_jsr_xhandlers();
153
154 // The jsr continuation is only used when parsing_jsr is true, and
155 // is different from the "normal" continuation since we can end up
156 // doing a return (rather than a ret) from within a subroutine
157 BlockBegin* jsr_continuation() const { return _jsr_continuation; }
158 void set_jsr_continuation(BlockBegin* cont) { _jsr_continuation = cont; }
159
160 int num_returns();
161 void incr_num_returns();
162
163 void set_inline_cleanup_info(BlockBegin* block,
164 Instruction* return_prev,
165 ValueStack* return_state);
166 BlockBegin* inline_cleanup_block() const { return _cleanup_block; }
167 Instruction* inline_cleanup_return_prev() const{ return _cleanup_return_prev; }
168 ValueStack* inline_cleanup_state() const { return _cleanup_state; }
169
170 bool ignore_return() const { return _ignore_return; }
171 void set_ignore_return(bool ignore_return) { _ignore_return = ignore_return; }
172 };
173
174 // for all GraphBuilders
175 static bool _can_trap[Bytecodes::number_of_java_codes];
176
177 // for each instance of GraphBuilder
178 ScopeData* _scope_data; // Per-scope data; used for inlining
179 Compilation* _compilation; // the current compilation
180 ValueMap* _vmap; // the map of values encountered (for CSE)
181 MemoryBuffer* _memory;
182 const char* _inline_bailout_msg; // non-null if most recent inline attempt failed
183 int _instruction_count; // for bailing out in pathological jsr/ret cases
184 BlockBegin* _start; // the start block
185 BlockBegin* _osr_entry; // the osr entry block block
186 ValueStack* _initial_state; // The state for the start block
187
188 // for each call to connect_to_end; can also be set by inliner
189 BlockBegin* _block; // the current block
190 ValueStack* _state; // the current execution state
191 Instruction* _last; // the last instruction added
192 bool _skip_block; // skip processing of the rest of this block
193
194 // accessors
195 ScopeData* scope_data() const { return _scope_data; }
196 Compilation* compilation() const { return _compilation; }
197 BlockList* bci2block() const { return scope_data()->bci2block(); }
198 ValueMap* vmap() const { assert(UseLocalValueNumbering, "should not access otherwise"); return _vmap; }
199 bool has_handler() const { return scope_data()->has_handler(); }
200
201 BlockBegin* block() const { return _block; }
202 ValueStack* state() const { return _state; }
203 void set_state(ValueStack* state) { _state = state; }
204 IRScope* scope() const { return scope_data()->scope(); }
205 ciMethod* method() const { return scope()->method(); }
206 ciBytecodeStream* stream() const { return scope_data()->stream(); }
207 Instruction* last() const { return _last; }
208 Bytecodes::Code code() const { return stream()->cur_bc(); }
209 int bci() const { return stream()->cur_bci(); }
210 int next_bci() const { return stream()->next_bci(); }
211
212 // unified bailout support
213 void bailout(const char* msg) const { compilation()->bailout(msg); }
214 bool bailed_out() const { return compilation()->bailed_out(); }
215
216 // stack manipulation helpers
217 void ipush(Value t) const { state()->ipush(t); }
218 void lpush(Value t) const { state()->lpush(t); }
219 void fpush(Value t) const { state()->fpush(t); }
220 void dpush(Value t) const { state()->dpush(t); }
221 void apush(Value t) const { state()->apush(t); }
222 void push(ValueType* type, Value t) const { state()-> push(type, t); }
223
224 Value ipop() { return state()->ipop(); }
225 Value lpop() { return state()->lpop(); }
226 Value fpop() { return state()->fpop(); }
227 Value dpop() { return state()->dpop(); }
228 Value apop() { return state()->apop(); }
229 Value pop(ValueType* type) { return state()-> pop(type); }
230
231 // instruction helpers
232 void load_constant();
233 void load_local(ValueType* type, int index);
234 void store_local(ValueType* type, int index);
235 void store_local(ValueStack* state, Value value, int index);
236 void load_indexed (BasicType type);
237 void store_indexed(BasicType type);
238 void stack_op(Bytecodes::Code code);
239 void arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before = NULL);
240 void negate_op(ValueType* type);
241 void shift_op(ValueType* type, Bytecodes::Code code);
242 void logic_op(ValueType* type, Bytecodes::Code code);
243 void compare_op(ValueType* type, Bytecodes::Code code);
244 void convert(Bytecodes::Code op, BasicType from, BasicType to);
245 void increment();
246 void _goto(int from_bci, int to_bci);
247 void if_node(Value x, If::Condition cond, Value y, ValueStack* stack_before);
248 void if_zero(ValueType* type, If::Condition cond);
249 void if_null(ValueType* type, If::Condition cond);
250 void if_same(ValueType* type, If::Condition cond);
251 void jsr(int dest);
252 void ret(int local_index);
253 void table_switch();
254 void lookup_switch();
255 void method_return(Value x, bool ignore_return = false);
256 void call_register_finalizer();
257 void access_field(Bytecodes::Code code);
258 void invoke(Bytecodes::Code code);
259 void new_instance(int klass_index);
260 void new_type_array();
261 void new_object_array();
262 void check_cast(int klass_index);
263 void instance_of(int klass_index);
264 void monitorenter(Value x, int bci);
265 void monitorexit(Value x, int bci);
266 void new_multi_array(int dimensions);
267 void throw_op(int bci);
268 Value round_fp(Value fp_value);
269
270 // stack/code manipulation helpers
271 Instruction* append_with_bci(Instruction* instr, int bci);
272 Instruction* append(Instruction* instr);
273 Instruction* append_split(StateSplit* instr);
274
275 // other helpers
276 BlockBegin* block_at(int bci) { return scope_data()->block_at(bci); }
277 XHandlers* handle_exception(Instruction* instruction);
278 void connect_to_end(BlockBegin* beg);
279 void null_check(Value value);
280 void eliminate_redundant_phis(BlockBegin* start);
281 BlockEnd* iterate_bytecodes_for_block(int bci);
282 void iterate_all_blocks(bool start_in_current_block_for_inlining = false);
283 Dependencies* dependency_recorder() const; // = compilation()->dependencies()
284 bool direct_compare(ciKlass* k);
285 Value make_constant(ciConstant value, ciField* field);
286
287 void kill_all();
288
289 // use of state copy routines (try to minimize unnecessary state
290 // object allocations):
291
292 // - if the instruction unconditionally needs a full copy of the
293 // state (for patching for example), then use copy_state_before*
294
295 // - if the instruction needs a full copy of the state only for
296 // handler generation (Instruction::needs_exception_state() returns
297 // false) then use copy_state_exhandling*
298
299 // - if the instruction needs either a full copy of the state for
300 // handler generation and a least a minimal copy of the state (as
301 // returned by Instruction::exception_state()) for debug info
302 // generation (that is when Instruction::needs_exception_state()
303 // returns true) then use copy_state_for_exception*
304
305 ValueStack* copy_state_before_with_bci(int bci);
306 ValueStack* copy_state_before();
307 ValueStack* copy_state_exhandling_with_bci(int bci);
308 ValueStack* copy_state_exhandling();
309 ValueStack* copy_state_for_exception_with_bci(int bci);
310 ValueStack* copy_state_for_exception();
311 ValueStack* copy_state_if_bb(bool is_bb) { return (is_bb || compilation()->is_optimistic()) ? copy_state_before() : NULL; }
312 ValueStack* copy_state_indexed_access() { return compilation()->is_optimistic() ? copy_state_before() : copy_state_for_exception(); }
313
314 //
315 // Inlining support
316 //
317
318 // accessors
319 bool parsing_jsr() const { return scope_data()->parsing_jsr(); }
320 BlockBegin* continuation() const { return scope_data()->continuation(); }
321 BlockBegin* jsr_continuation() const { return scope_data()->jsr_continuation(); }
322 void set_continuation(BlockBegin* continuation) { scope_data()->set_continuation(continuation); }
323 void set_inline_cleanup_info(BlockBegin* block,
324 Instruction* return_prev,
325 ValueStack* return_state) { scope_data()->set_inline_cleanup_info(block,
326 return_prev,
327 return_state); }
328 void set_inline_cleanup_info() {
329 set_inline_cleanup_info(_block, _last, _state);
330 }
331 BlockBegin* inline_cleanup_block() const { return scope_data()->inline_cleanup_block(); }
332 Instruction* inline_cleanup_return_prev() const { return scope_data()->inline_cleanup_return_prev(); }
333 ValueStack* inline_cleanup_state() const { return scope_data()->inline_cleanup_state(); }
334 void restore_inline_cleanup_info() {
335 _block = inline_cleanup_block();
336 _last = inline_cleanup_return_prev();
337 _state = inline_cleanup_state();
338 }
339 void incr_num_returns() { scope_data()->incr_num_returns(); }
340 int num_returns() const { return scope_data()->num_returns(); }
341 intx max_inline_size() const { return scope_data()->max_inline_size(); }
342 int inline_level() const { return scope()->level(); }
343 int recursive_inline_level(ciMethod* callee) const;
344
345 // inlining of synchronized methods
346 void inline_sync_entry(Value lock, BlockBegin* sync_handler);
347 void fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler = false);
348
349 void build_graph_for_intrinsic(ciMethod* callee, bool ignore_return);
350
351 // inliners
352 bool try_inline( ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc = Bytecodes::_illegal, Value receiver = NULL);
353 bool try_inline_intrinsics(ciMethod* callee, bool ignore_return = false);
354 bool try_inline_full( ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc = Bytecodes::_illegal, Value receiver = NULL);
355 bool try_inline_jsr(int jsr_dest_bci);
356
357 const char* check_can_parse(ciMethod* callee) const;
358 const char* should_not_inline(ciMethod* callee) const;
359
360 // JSR 292 support
361 bool try_method_handle_inline(ciMethod* callee, bool ignore_return);
362
363 // helpers
364 void inline_bailout(const char* msg);
365 BlockBegin* header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state);
366 BlockBegin* setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* init_state);
367 void setup_osr_entry_block();
368 void clear_inline_bailout();
369 ValueStack* state_at_entry();
370 void push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start);
371 void push_scope(ciMethod* callee, BlockBegin* continuation);
372 void push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci);
373 void pop_scope();
374 void pop_scope_for_jsr();
375
376 void append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile);
377 void append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile);
378 void append_unsafe_get_raw(ciMethod* callee, BasicType t);
379 void append_unsafe_put_raw(ciMethod* callee, BasicType t);
380 void append_unsafe_CAS(ciMethod* callee);
381 void append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add);
382 void append_char_access(ciMethod* callee, bool is_store);
383
384 void print_inlining(ciMethod* callee, const char* msg = NULL, bool success = true);
385
386 void profile_call(ciMethod* callee, Value recv, ciKlass* predicted_holder, Values* obj_args, bool inlined);
387 void profile_return_type(Value ret, ciMethod* callee, ciMethod* m = NULL, int bci = -1);
388 void profile_invocation(ciMethod* inlinee, ValueStack* state);
389
390 // Shortcuts to profiling control.
391 bool is_profiling() { return _compilation->is_profiling(); }
392 bool count_invocations() { return _compilation->count_invocations(); }
393 bool count_backedges() { return _compilation->count_backedges(); }
394 bool profile_branches() { return _compilation->profile_branches(); }
395 bool profile_calls() { return _compilation->profile_calls(); }
396 bool profile_inlined_calls() { return _compilation->profile_inlined_calls(); }
397 bool profile_checkcasts() { return _compilation->profile_checkcasts(); }
398 bool profile_parameters() { return _compilation->profile_parameters(); }
399 bool profile_arguments() { return _compilation->profile_arguments(); }
400 bool profile_return() { return _compilation->profile_return(); }
401
402 Values* args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver);
403 Values* collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver);
404 void check_args_for_profiling(Values* obj_args, int expected);
405
406 public:
407 NOT_PRODUCT(void print_stats();)
408
409 // initialization
410 static void initialize();
411
412 // public
413 static bool can_trap(ciMethod* method, Bytecodes::Code code) {
414 assert(0 <= code && code < Bytecodes::number_of_java_codes, "illegal bytecode");
415 if (_can_trap[code]) return true;
416 // special handling for finalizer registration
417 return code == Bytecodes::_return && method->intrinsic_id() == vmIntrinsics::_Object_init;
418 }
419
420 // creation
421 GraphBuilder(Compilation* compilation, IRScope* scope);
422 static void sort_top_into_worklist(BlockList* worklist, BlockBegin* top);
423
424 BlockBegin* start() const { return _start; }
425 };
426
427 #endif // SHARE_C1_C1_GRAPHBUILDER_HPP