1 /*
2 * Copyright (c) 1998, 2024, 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 #include "precompiled.hpp"
26 #include "asm/assembler.inline.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/debugInfo.hpp"
30 #include "code/debugInfoRec.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/compilerDirectives.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/shared/barrierSet.hpp"
36 #include "gc/shared/c2/barrierSetC2.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/allocation.hpp"
39 #include "opto/ad.hpp"
40 #include "opto/block.hpp"
41 #include "opto/c2compiler.hpp"
42 #include "opto/c2_MacroAssembler.hpp"
43 #include "opto/callnode.hpp"
44 #include "opto/cfgnode.hpp"
45 #include "opto/locknode.hpp"
46 #include "opto/machnode.hpp"
47 #include "opto/node.hpp"
48 #include "opto/optoreg.hpp"
49 #include "opto/output.hpp"
50 #include "opto/regalloc.hpp"
51 #include "opto/runtime.hpp"
52 #include "opto/subnode.hpp"
53 #include "opto/type.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #include "utilities/xmlstream.hpp"
59
60 #ifndef PRODUCT
61 #define DEBUG_ARG(x) , x
62 #else
63 #define DEBUG_ARG(x)
64 #endif
65
66 //------------------------------Scheduling----------------------------------
67 // This class contains all the information necessary to implement instruction
68 // scheduling and bundling.
69 class Scheduling {
70
71 private:
72 // Arena to use
73 Arena *_arena;
74
75 // Control-Flow Graph info
76 PhaseCFG *_cfg;
77
78 // Register Allocation info
79 PhaseRegAlloc *_regalloc;
80
81 // Number of nodes in the method
82 uint _node_bundling_limit;
83
84 // List of scheduled nodes. Generated in reverse order
85 Node_List _scheduled;
86
87 // List of nodes currently available for choosing for scheduling
88 Node_List _available;
89
90 // For each instruction beginning a bundle, the number of following
91 // nodes to be bundled with it.
92 Bundle *_node_bundling_base;
93
94 // Mapping from register to Node
95 Node_List _reg_node;
96
97 // Free list for pinch nodes.
98 Node_List _pinch_free_list;
99
100 // Number of uses of this node within the containing basic block.
101 short *_uses;
102
103 // Schedulable portion of current block. Skips Region/Phi/CreateEx up
104 // front, branch+proj at end. Also skips Catch/CProj (same as
105 // branch-at-end), plus just-prior exception-throwing call.
106 uint _bb_start, _bb_end;
107
108 // Latency from the end of the basic block as scheduled
109 unsigned short *_current_latency;
110
111 // Remember the next node
112 Node *_next_node;
113
114 // Use this for an unconditional branch delay slot
115 Node *_unconditional_delay_slot;
116
117 // Pointer to a Nop
118 MachNopNode *_nop;
119
120 // Length of the current bundle, in instructions
121 uint _bundle_instr_count;
122
123 // Current Cycle number, for computing latencies and bundling
124 uint _bundle_cycle_number;
125
126 // Bundle information
127 Pipeline_Use_Element _bundle_use_elements[resource_count];
128 Pipeline_Use _bundle_use;
129
130 // Dump the available list
131 void dump_available() const;
132
133 public:
134 Scheduling(Arena *arena, Compile &compile);
135
136 // Destructor
137 NOT_PRODUCT( ~Scheduling(); )
138
139 // Step ahead "i" cycles
140 void step(uint i);
141
142 // Step ahead 1 cycle, and clear the bundle state (for example,
143 // at a branch target)
144 void step_and_clear();
145
146 Bundle* node_bundling(const Node *n) {
147 assert(valid_bundle_info(n), "oob");
148 return (&_node_bundling_base[n->_idx]);
149 }
150
151 bool valid_bundle_info(const Node *n) const {
152 return (_node_bundling_limit > n->_idx);
153 }
154
155 bool starts_bundle(const Node *n) const {
156 return (_node_bundling_limit > n->_idx && _node_bundling_base[n->_idx].starts_bundle());
157 }
158
159 // Do the scheduling
160 void DoScheduling();
161
162 // Compute the register antidependencies within a basic block
163 void ComputeRegisterAntidependencies(Block *bb);
164 void verify_do_def( Node *n, OptoReg::Name def, const char *msg );
165 void verify_good_schedule( Block *b, const char *msg );
166 void anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def );
167 void anti_do_use( Block *b, Node *use, OptoReg::Name use_reg );
168
169 // Add a node to the current bundle
170 void AddNodeToBundle(Node *n, const Block *bb);
171
172 // Return an integer less than, equal to, or greater than zero
173 // if the stack offset of the first argument is respectively
174 // less than, equal to, or greater than the second.
175 int compare_two_spill_nodes(Node* first, Node* second);
176
177 // Add a node to the list of available nodes
178 void AddNodeToAvailableList(Node *n);
179
180 // Compute the local use count for the nodes in a block, and compute
181 // the list of instructions with no uses in the block as available
182 void ComputeUseCount(const Block *bb);
183
184 // Choose an instruction from the available list to add to the bundle
185 Node * ChooseNodeToBundle();
186
187 // See if this Node fits into the currently accumulating bundle
188 bool NodeFitsInBundle(Node *n);
189
190 // Decrement the use count for a node
191 void DecrementUseCounts(Node *n, const Block *bb);
192
193 // Garbage collect pinch nodes for reuse by other blocks.
194 void garbage_collect_pinch_nodes();
195 // Clean up a pinch node for reuse (helper for above).
196 void cleanup_pinch( Node *pinch );
197
198 // Information for statistics gathering
199 #ifndef PRODUCT
200 private:
201 // Gather information on size of nops relative to total
202 uint _branches, _unconditional_delays;
203
204 static uint _total_nop_size, _total_method_size;
205 static uint _total_branches, _total_unconditional_delays;
206 static uint _total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
207
208 public:
209 static void print_statistics();
210
211 static void increment_instructions_per_bundle(uint i) {
212 _total_instructions_per_bundle[i]++;
213 }
214
215 static void increment_nop_size(uint s) {
216 _total_nop_size += s;
217 }
218
219 static void increment_method_size(uint s) {
220 _total_method_size += s;
221 }
222 #endif
223
224 };
225
226 PhaseOutput::PhaseOutput()
227 : Phase(Phase::Output),
228 _code_buffer("Compile::Fill_buffer"),
229 _first_block_size(0),
230 _handler_table(),
231 _inc_table(),
232 _stub_list(),
233 _oop_map_set(nullptr),
234 _scratch_buffer_blob(nullptr),
235 _scratch_locs_memory(nullptr),
236 _scratch_const_size(-1),
237 _in_scratch_emit_size(false),
238 _frame_slots(0),
239 _code_offsets(),
240 _node_bundling_limit(0),
241 _node_bundling_base(nullptr),
242 _orig_pc_slot(0),
243 _orig_pc_slot_offset_in_bytes(0),
244 _buf_sizes(),
245 _block(nullptr),
246 _index(0) {
247 C->set_output(this);
248 if (C->stub_name() == nullptr) {
249 _orig_pc_slot = C->fixed_slots() - (sizeof(address) / VMRegImpl::stack_slot_size);
250 }
251 }
252
253 PhaseOutput::~PhaseOutput() {
254 C->set_output(nullptr);
255 if (_scratch_buffer_blob != nullptr) {
256 BufferBlob::free(_scratch_buffer_blob);
257 }
258 }
259
260 void PhaseOutput::perform_mach_node_analysis() {
261 // Late barrier analysis must be done after schedule and bundle
262 // Otherwise liveness based spilling will fail
263 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
264 bs->late_barrier_analysis();
265
266 pd_perform_mach_node_analysis();
267
268 C->print_method(CompilerPhaseType::PHASE_MACH_ANALYSIS, 3);
269 }
270
271 // Convert Nodes to instruction bits and pass off to the VM
272 void PhaseOutput::Output() {
273 // RootNode goes
274 assert( C->cfg()->get_root_block()->number_of_nodes() == 0, "" );
275
276 // The number of new nodes (mostly MachNop) is proportional to
277 // the number of java calls and inner loops which are aligned.
278 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 +
279 C->inner_loops()*(OptoLoopAlignment-1)),
280 "out of nodes before code generation" ) ) {
281 return;
282 }
283 // Make sure I can find the Start Node
284 Block *entry = C->cfg()->get_block(1);
285 Block *broot = C->cfg()->get_root_block();
286
287 const StartNode *start = entry->head()->as_Start();
288
289 // Replace StartNode with prolog
290 MachPrologNode *prolog = new MachPrologNode();
291 entry->map_node(prolog, 0);
292 C->cfg()->map_node_to_block(prolog, entry);
293 C->cfg()->unmap_node_from_block(start); // start is no longer in any block
294
295 // Virtual methods need an unverified entry point
296
297 if( C->is_osr_compilation() ) {
298 if( PoisonOSREntry ) {
299 // TODO: Should use a ShouldNotReachHereNode...
300 C->cfg()->insert( broot, 0, new MachBreakpointNode() );
301 }
302 } else {
303 if( C->method() && !C->method()->flags().is_static() ) {
304 // Insert unvalidated entry point
305 C->cfg()->insert( broot, 0, new MachUEPNode() );
306 }
307
308 }
309
310 // Break before main entry point
311 if ((C->method() && C->directive()->BreakAtExecuteOption) ||
312 (OptoBreakpoint && C->is_method_compilation()) ||
313 (OptoBreakpointOSR && C->is_osr_compilation()) ||
314 (OptoBreakpointC2R && !C->method()) ) {
315 // checking for C->method() means that OptoBreakpoint does not apply to
316 // runtime stubs or frame converters
317 C->cfg()->insert( entry, 1, new MachBreakpointNode() );
318 }
319
320 // Insert epilogs before every return
321 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
322 Block* block = C->cfg()->get_block(i);
323 if (!block->is_connector() && block->non_connector_successor(0) == C->cfg()->get_root_block()) { // Found a program exit point?
324 Node* m = block->end();
325 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) {
326 MachEpilogNode* epilog = new MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return);
327 block->add_inst(epilog);
328 C->cfg()->map_node_to_block(epilog, block);
329 }
330 }
331 }
332
333 // Keeper of sizing aspects
334 _buf_sizes = BufferSizingData();
335
336 // Initialize code buffer
337 estimate_buffer_size(_buf_sizes._const);
338 if (C->failing()) return;
339
340 // Pre-compute the length of blocks and replace
341 // long branches with short if machine supports it.
342 // Must be done before ScheduleAndBundle due to SPARC delay slots
343 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, C->cfg()->number_of_blocks() + 1);
344 blk_starts[0] = 0;
345 shorten_branches(blk_starts);
346
347 ScheduleAndBundle();
348 if (C->failing()) {
349 return;
350 }
351
352 perform_mach_node_analysis();
353
354 // Complete sizing of codebuffer
355 CodeBuffer* cb = init_buffer();
356 if (cb == nullptr || C->failing()) {
357 return;
358 }
359
360 BuildOopMaps();
361
362 if (C->failing()) {
363 return;
364 }
365
366 C2_MacroAssembler masm(cb);
367 fill_buffer(&masm, blk_starts);
368 }
369
370 bool PhaseOutput::need_stack_bang(int frame_size_in_bytes) const {
371 // Determine if we need to generate a stack overflow check.
372 // Do it if the method is not a stub function and
373 // has java calls or has frame size > vm_page_size/8.
374 // The debug VM checks that deoptimization doesn't trigger an
375 // unexpected stack overflow (compiled method stack banging should
376 // guarantee it doesn't happen) so we always need the stack bang in
377 // a debug VM.
378 return (C->stub_function() == nullptr &&
379 (C->has_java_calls() || frame_size_in_bytes > (int)(os::vm_page_size())>>3
380 DEBUG_ONLY(|| true)));
381 }
382
383 bool PhaseOutput::need_register_stack_bang() const {
384 // Determine if we need to generate a register stack overflow check.
385 // This is only used on architectures which have split register
386 // and memory stacks (ie. IA64).
387 // Bang if the method is not a stub function and has java calls
388 return (C->stub_function() == nullptr && C->has_java_calls());
389 }
390
391
392 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top
393 // of a loop. When aligning a loop we need to provide enough instructions
394 // in cpu's fetch buffer to feed decoders. The loop alignment could be
395 // avoided if we have enough instructions in fetch buffer at the head of a loop.
396 // By default, the size is set to 999999 by Block's constructor so that
397 // a loop will be aligned if the size is not reset here.
398 //
399 // Note: Mach instructions could contain several HW instructions
400 // so the size is estimated only.
401 //
402 void PhaseOutput::compute_loop_first_inst_sizes() {
403 // The next condition is used to gate the loop alignment optimization.
404 // Don't aligned a loop if there are enough instructions at the head of a loop
405 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad
406 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is
407 // equal to 11 bytes which is the largest address NOP instruction.
408 if (MaxLoopPad < OptoLoopAlignment - 1) {
409 uint last_block = C->cfg()->number_of_blocks() - 1;
410 for (uint i = 1; i <= last_block; i++) {
411 Block* block = C->cfg()->get_block(i);
412 // Check the first loop's block which requires an alignment.
413 if (block->loop_alignment() > (uint)relocInfo::addr_unit()) {
414 uint sum_size = 0;
415 uint inst_cnt = NumberOfLoopInstrToAlign;
416 inst_cnt = block->compute_first_inst_size(sum_size, inst_cnt, C->regalloc());
417
418 // Check subsequent fallthrough blocks if the loop's first
419 // block(s) does not have enough instructions.
420 Block *nb = block;
421 while(inst_cnt > 0 &&
422 i < last_block &&
423 !C->cfg()->get_block(i + 1)->has_loop_alignment() &&
424 !nb->has_successor(block)) {
425 i++;
426 nb = C->cfg()->get_block(i);
427 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, C->regalloc());
428 } // while( inst_cnt > 0 && i < last_block )
429
430 block->set_first_inst_size(sum_size);
431 } // f( b->head()->is_Loop() )
432 } // for( i <= last_block )
433 } // if( MaxLoopPad < OptoLoopAlignment-1 )
434 }
435
436 // The architecture description provides short branch variants for some long
437 // branch instructions. Replace eligible long branches with short branches.
438 void PhaseOutput::shorten_branches(uint* blk_starts) {
439
440 Compile::TracePhase tp("shorten branches", &timers[_t_shortenBranches]);
441
442 // Compute size of each block, method size, and relocation information size
443 uint nblocks = C->cfg()->number_of_blocks();
444
445 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
446 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
447 int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks);
448
449 // Collect worst case block paddings
450 int* block_worst_case_pad = NEW_RESOURCE_ARRAY(int, nblocks);
451 memset(block_worst_case_pad, 0, nblocks * sizeof(int));
452
453 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); )
454 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); )
455
456 bool has_short_branch_candidate = false;
457
458 // Initialize the sizes to 0
459 int code_size = 0; // Size in bytes of generated code
460 int stub_size = 0; // Size in bytes of all stub entries
461 // Size in bytes of all relocation entries, including those in local stubs.
462 // Start with 2-bytes of reloc info for the unvalidated entry point
463 int reloc_size = 1; // Number of relocation entries
464
465 // Make three passes. The first computes pessimistic blk_starts,
466 // relative jmp_offset and reloc_size information. The second performs
467 // short branch substitution using the pessimistic sizing. The
468 // third inserts nops where needed.
469
470 // Step one, perform a pessimistic sizing pass.
471 uint last_call_adr = max_juint;
472 uint last_avoid_back_to_back_adr = max_juint;
473 uint nop_size = (new MachNopNode())->size(C->regalloc());
474 for (uint i = 0; i < nblocks; i++) { // For all blocks
475 Block* block = C->cfg()->get_block(i);
476 _block = block;
477
478 // During short branch replacement, we store the relative (to blk_starts)
479 // offset of jump in jmp_offset, rather than the absolute offset of jump.
480 // This is so that we do not need to recompute sizes of all nodes when
481 // we compute correct blk_starts in our next sizing pass.
482 jmp_offset[i] = 0;
483 jmp_size[i] = 0;
484 jmp_nidx[i] = -1;
485 DEBUG_ONLY( jmp_target[i] = 0; )
486 DEBUG_ONLY( jmp_rule[i] = 0; )
487
488 // Sum all instruction sizes to compute block size
489 uint last_inst = block->number_of_nodes();
490 uint blk_size = 0;
491 for (uint j = 0; j < last_inst; j++) {
492 _index = j;
493 Node* nj = block->get_node(_index);
494 // Handle machine instruction nodes
495 if (nj->is_Mach()) {
496 MachNode* mach = nj->as_Mach();
497 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding
498 reloc_size += mach->reloc();
499 if (mach->is_MachCall()) {
500 // add size information for trampoline stub
501 // class CallStubImpl is platform-specific and defined in the *.ad files.
502 stub_size += CallStubImpl::size_call_trampoline();
503 reloc_size += CallStubImpl::reloc_call_trampoline();
504
505 MachCallNode *mcall = mach->as_MachCall();
506 // This destination address is NOT PC-relative
507
508 mcall->method_set((intptr_t)mcall->entry_point());
509
510 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) {
511 stub_size += CompiledDirectCall::to_interp_stub_size();
512 reloc_size += CompiledDirectCall::reloc_to_interp_stub();
513 }
514 } else if (mach->is_MachSafePoint()) {
515 // If call/safepoint are adjacent, account for possible
516 // nop to disambiguate the two safepoints.
517 // ScheduleAndBundle() can rearrange nodes in a block,
518 // check for all offsets inside this block.
519 if (last_call_adr >= blk_starts[i]) {
520 blk_size += nop_size;
521 }
522 }
523 if (mach->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
524 // Nop is inserted between "avoid back to back" instructions.
525 // ScheduleAndBundle() can rearrange nodes in a block,
526 // check for all offsets inside this block.
527 if (last_avoid_back_to_back_adr >= blk_starts[i]) {
528 blk_size += nop_size;
529 }
530 }
531 if (mach->may_be_short_branch()) {
532 if (!nj->is_MachBranch()) {
533 #ifndef PRODUCT
534 nj->dump(3);
535 #endif
536 Unimplemented();
537 }
538 assert(jmp_nidx[i] == -1, "block should have only one branch");
539 jmp_offset[i] = blk_size;
540 jmp_size[i] = nj->size(C->regalloc());
541 jmp_nidx[i] = j;
542 has_short_branch_candidate = true;
543 }
544 }
545 blk_size += nj->size(C->regalloc());
546 // Remember end of call offset
547 if (nj->is_MachCall() && !nj->is_MachCallLeaf()) {
548 last_call_adr = blk_starts[i]+blk_size;
549 }
550 // Remember end of avoid_back_to_back offset
551 if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
552 last_avoid_back_to_back_adr = blk_starts[i]+blk_size;
553 }
554 }
555
556 // When the next block starts a loop, we may insert pad NOP
557 // instructions. Since we cannot know our future alignment,
558 // assume the worst.
559 if (i < nblocks - 1) {
560 Block* nb = C->cfg()->get_block(i + 1);
561 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit();
562 if (max_loop_pad > 0) {
563 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), "");
564 // Adjust last_call_adr and/or last_avoid_back_to_back_adr.
565 // If either is the last instruction in this block, bump by
566 // max_loop_pad in lock-step with blk_size, so sizing
567 // calculations in subsequent blocks still can conservatively
568 // detect that it may the last instruction in this block.
569 if (last_call_adr == blk_starts[i]+blk_size) {
570 last_call_adr += max_loop_pad;
571 }
572 if (last_avoid_back_to_back_adr == blk_starts[i]+blk_size) {
573 last_avoid_back_to_back_adr += max_loop_pad;
574 }
575 blk_size += max_loop_pad;
576 block_worst_case_pad[i + 1] = max_loop_pad;
577 }
578 }
579
580 // Save block size; update total method size
581 blk_starts[i+1] = blk_starts[i]+blk_size;
582 }
583
584 // Step two, replace eligible long jumps.
585 bool progress = true;
586 uint last_may_be_short_branch_adr = max_juint;
587 while (has_short_branch_candidate && progress) {
588 progress = false;
589 has_short_branch_candidate = false;
590 int adjust_block_start = 0;
591 for (uint i = 0; i < nblocks; i++) {
592 Block* block = C->cfg()->get_block(i);
593 int idx = jmp_nidx[i];
594 MachNode* mach = (idx == -1) ? nullptr: block->get_node(idx)->as_Mach();
595 if (mach != nullptr && mach->may_be_short_branch()) {
596 #ifdef ASSERT
597 assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity");
598 int j;
599 // Find the branch; ignore trailing NOPs.
600 for (j = block->number_of_nodes()-1; j>=0; j--) {
601 Node* n = block->get_node(j);
602 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con)
603 break;
604 }
605 assert(j >= 0 && j == idx && block->get_node(j) == (Node*)mach, "sanity");
606 #endif
607 int br_size = jmp_size[i];
608 int br_offs = blk_starts[i] + jmp_offset[i];
609
610 // This requires the TRUE branch target be in succs[0]
611 uint bnum = block->non_connector_successor(0)->_pre_order;
612 int offset = blk_starts[bnum] - br_offs;
613 if (bnum > i) { // adjust following block's offset
614 offset -= adjust_block_start;
615 }
616
617 // This block can be a loop header, account for the padding
618 // in the previous block.
619 int block_padding = block_worst_case_pad[i];
620 assert(i == 0 || block_padding == 0 || br_offs >= block_padding, "Should have at least a padding on top");
621 // In the following code a nop could be inserted before
622 // the branch which will increase the backward distance.
623 bool needs_padding = ((uint)(br_offs - block_padding) == last_may_be_short_branch_adr);
624 assert(!needs_padding || jmp_offset[i] == 0, "padding only branches at the beginning of block");
625
626 if (needs_padding && offset <= 0)
627 offset -= nop_size;
628
629 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
630 // We've got a winner. Replace this branch.
631 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
632
633 // Update the jmp_size.
634 int new_size = replacement->size(C->regalloc());
635 int diff = br_size - new_size;
636 assert(diff >= (int)nop_size, "short_branch size should be smaller");
637 // Conservatively take into account padding between
638 // avoid_back_to_back branches. Previous branch could be
639 // converted into avoid_back_to_back branch during next
640 // rounds.
641 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
642 jmp_offset[i] += nop_size;
643 diff -= nop_size;
644 }
645 adjust_block_start += diff;
646 block->map_node(replacement, idx);
647 mach->subsume_by(replacement, C);
648 mach = replacement;
649 progress = true;
650
651 jmp_size[i] = new_size;
652 DEBUG_ONLY( jmp_target[i] = bnum; );
653 DEBUG_ONLY( jmp_rule[i] = mach->rule(); );
654 } else {
655 // The jump distance is not short, try again during next iteration.
656 has_short_branch_candidate = true;
657 }
658 } // (mach->may_be_short_branch())
659 if (mach != nullptr && (mach->may_be_short_branch() ||
660 mach->avoid_back_to_back(MachNode::AVOID_AFTER))) {
661 last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i];
662 }
663 blk_starts[i+1] -= adjust_block_start;
664 }
665 }
666
667 #ifdef ASSERT
668 for (uint i = 0; i < nblocks; i++) { // For all blocks
669 if (jmp_target[i] != 0) {
670 int br_size = jmp_size[i];
671 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
672 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
673 tty->print_cr("target (%d) - jmp_offset(%d) = offset (%d), jump_size(%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_offset[i], offset, br_size, i, jmp_target[i]);
674 }
675 assert(C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp");
676 }
677 }
678 #endif
679
680 // Step 3, compute the offsets of all blocks, will be done in fill_buffer()
681 // after ScheduleAndBundle().
682
683 // ------------------
684 // Compute size for code buffer
685 code_size = blk_starts[nblocks];
686
687 // Relocation records
688 reloc_size += 1; // Relo entry for exception handler
689
690 // Adjust reloc_size to number of record of relocation info
691 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for
692 // a relocation index.
693 // The CodeBuffer will expand the locs array if this estimate is too low.
694 reloc_size *= 10 / sizeof(relocInfo);
695
696 _buf_sizes._reloc = reloc_size;
697 _buf_sizes._code = code_size;
698 _buf_sizes._stub = stub_size;
699 }
700
701 //------------------------------FillLocArray-----------------------------------
702 // Create a bit of debug info and append it to the array. The mapping is from
703 // Java local or expression stack to constant, register or stack-slot. For
704 // doubles, insert 2 mappings and return 1 (to tell the caller that the next
705 // entry has been taken care of and caller should skip it).
706 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) {
707 // This should never have accepted Bad before
708 assert(OptoReg::is_valid(regnum), "location must be valid");
709 return (OptoReg::is_reg(regnum))
710 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) )
711 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum)));
712 }
713
714
715 ObjectValue*
716 PhaseOutput::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) {
717 for (int i = 0; i < objs->length(); i++) {
718 assert(objs->at(i)->is_object(), "corrupt object cache");
719 ObjectValue* sv = (ObjectValue*) objs->at(i);
720 if (sv->id() == id) {
721 return sv;
722 }
723 }
724 // Otherwise..
725 return nullptr;
726 }
727
728 void PhaseOutput::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs,
729 ObjectValue* sv ) {
730 assert(sv_for_node_id(objs, sv->id()) == nullptr, "Precondition");
731 objs->append(sv);
732 }
733
734
735 void PhaseOutput::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local,
736 GrowableArray<ScopeValue*> *array,
737 GrowableArray<ScopeValue*> *objs ) {
738 assert( local, "use _top instead of null" );
739 if (array->length() != idx) {
740 assert(array->length() == idx + 1, "Unexpected array count");
741 // Old functionality:
742 // return
743 // New functionality:
744 // Assert if the local is not top. In product mode let the new node
745 // override the old entry.
746 assert(local == C->top(), "LocArray collision");
747 if (local == C->top()) {
748 return;
749 }
750 array->pop();
751 }
752 const Type *t = local->bottom_type();
753
754 // Is it a safepoint scalar object node?
755 if (local->is_SafePointScalarObject()) {
756 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject();
757
758 ObjectValue* sv = (ObjectValue*) sv_for_node_id(objs, spobj->_idx);
759 if (sv == nullptr) {
760 ciKlass* cik = t->is_oopptr()->exact_klass();
761 assert(cik->is_instance_klass() ||
762 cik->is_array_klass(), "Not supported allocation.");
763 sv = new ObjectValue(spobj->_idx,
764 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
765 set_sv_for_object_node(objs, sv);
766
767 uint first_ind = spobj->first_index(sfpt->jvms());
768 for (uint i = 0; i < spobj->n_fields(); i++) {
769 Node* fld_node = sfpt->in(first_ind+i);
770 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs);
771 }
772 }
773 array->append(sv);
774 return;
775 } else if (local->is_SafePointScalarMerge()) {
776 SafePointScalarMergeNode* smerge = local->as_SafePointScalarMerge();
777 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
778
779 if (mv == nullptr) {
780 GrowableArray<ScopeValue*> deps;
781
782 int merge_pointer_idx = smerge->merge_pointer_idx(sfpt->jvms());
783 (void)FillLocArray(0, sfpt, sfpt->in(merge_pointer_idx), &deps, objs);
784 assert(deps.length() == 1, "missing value");
785
786 int selector_idx = smerge->selector_idx(sfpt->jvms());
787 (void)FillLocArray(1, nullptr, sfpt->in(selector_idx), &deps, nullptr);
788 assert(deps.length() == 2, "missing value");
789
790 mv = new ObjectMergeValue(smerge->_idx, deps.at(0), deps.at(1));
791 set_sv_for_object_node(objs, mv);
792
793 for (uint i = 1; i < smerge->req(); i++) {
794 Node* obj_node = smerge->in(i);
795 (void)FillLocArray(mv->possible_objects()->length(), sfpt, obj_node, mv->possible_objects(), objs);
796 }
797 }
798 array->append(mv);
799 return;
800 }
801
802 // Grab the register number for the local
803 OptoReg::Name regnum = C->regalloc()->get_reg_first(local);
804 if( OptoReg::is_valid(regnum) ) {// Got a register/stack?
805 // Record the double as two float registers.
806 // The register mask for such a value always specifies two adjacent
807 // float registers, with the lower register number even.
808 // Normally, the allocation of high and low words to these registers
809 // is irrelevant, because nearly all operations on register pairs
810 // (e.g., StoreD) treat them as a single unit.
811 // Here, we assume in addition that the words in these two registers
812 // stored "naturally" (by operations like StoreD and double stores
813 // within the interpreter) such that the lower-numbered register
814 // is written to the lower memory address. This may seem like
815 // a machine dependency, but it is not--it is a requirement on
816 // the author of the <arch>.ad file to ensure that, for every
817 // even/odd double-register pair to which a double may be allocated,
818 // the word in the even single-register is stored to the first
819 // memory word. (Note that register numbers are completely
820 // arbitrary, and are not tied to any machine-level encodings.)
821 #ifdef _LP64
822 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) {
823 array->append(new ConstantIntValue((jint)0));
824 array->append(new_loc_value( C->regalloc(), regnum, Location::dbl ));
825 } else if ( t->base() == Type::Long ) {
826 array->append(new ConstantIntValue((jint)0));
827 array->append(new_loc_value( C->regalloc(), regnum, Location::lng ));
828 } else if ( t->base() == Type::RawPtr ) {
829 // jsr/ret return address which must be restored into the full
830 // width 64-bit stack slot.
831 array->append(new_loc_value( C->regalloc(), regnum, Location::lng ));
832 }
833 #else //_LP64
834 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) {
835 // Repack the double/long as two jints.
836 // The convention the interpreter uses is that the second local
837 // holds the first raw word of the native double representation.
838 // This is actually reasonable, since locals and stack arrays
839 // grow downwards in all implementations.
840 // (If, on some machine, the interpreter's Java locals or stack
841 // were to grow upwards, the embedded doubles would be word-swapped.)
842 array->append(new_loc_value( C->regalloc(), OptoReg::add(regnum,1), Location::normal ));
843 array->append(new_loc_value( C->regalloc(), regnum , Location::normal ));
844 }
845 #endif //_LP64
846 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) &&
847 OptoReg::is_reg(regnum) ) {
848 array->append(new_loc_value( C->regalloc(), regnum, Matcher::float_in_double()
849 ? Location::float_in_dbl : Location::normal ));
850 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) {
851 array->append(new_loc_value( C->regalloc(), regnum, Matcher::int_in_long
852 ? Location::int_in_long : Location::normal ));
853 } else if( t->base() == Type::NarrowOop ) {
854 array->append(new_loc_value( C->regalloc(), regnum, Location::narrowoop ));
855 } else if (t->base() == Type::VectorA || t->base() == Type::VectorS ||
856 t->base() == Type::VectorD || t->base() == Type::VectorX ||
857 t->base() == Type::VectorY || t->base() == Type::VectorZ) {
858 array->append(new_loc_value( C->regalloc(), regnum, Location::vector ));
859 } else if (C->regalloc()->is_oop(local)) {
860 assert(t->base() == Type::OopPtr || t->base() == Type::InstPtr ||
861 t->base() == Type::AryPtr,
862 "Unexpected type: %s", t->msg());
863 array->append(new_loc_value( C->regalloc(), regnum, Location::oop ));
864 } else {
865 assert(t->base() == Type::Int || t->base() == Type::Half ||
866 t->base() == Type::FloatCon || t->base() == Type::FloatBot,
867 "Unexpected type: %s", t->msg());
868 array->append(new_loc_value( C->regalloc(), regnum, Location::normal ));
869 }
870 return;
871 }
872
873 // No register. It must be constant data.
874 switch (t->base()) {
875 case Type::Half: // Second half of a double
876 ShouldNotReachHere(); // Caller should skip 2nd halves
877 break;
878 case Type::AnyPtr:
879 array->append(new ConstantOopWriteValue(nullptr));
880 break;
881 case Type::AryPtr:
882 case Type::InstPtr: // fall through
883 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding()));
884 break;
885 case Type::NarrowOop:
886 if (t == TypeNarrowOop::NULL_PTR) {
887 array->append(new ConstantOopWriteValue(nullptr));
888 } else {
889 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding()));
890 }
891 break;
892 case Type::Int:
893 array->append(new ConstantIntValue(t->is_int()->get_con()));
894 break;
895 case Type::RawPtr:
896 // A return address (T_ADDRESS).
897 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI");
898 #ifdef _LP64
899 // Must be restored to the full-width 64-bit stack slot.
900 array->append(new ConstantLongValue(t->is_ptr()->get_con()));
901 #else
902 array->append(new ConstantIntValue(t->is_ptr()->get_con()));
903 #endif
904 break;
905 case Type::FloatCon: {
906 float f = t->is_float_constant()->getf();
907 array->append(new ConstantIntValue(jint_cast(f)));
908 break;
909 }
910 case Type::DoubleCon: {
911 jdouble d = t->is_double_constant()->getd();
912 #ifdef _LP64
913 array->append(new ConstantIntValue((jint)0));
914 array->append(new ConstantDoubleValue(d));
915 #else
916 // Repack the double as two jints.
917 // The convention the interpreter uses is that the second local
918 // holds the first raw word of the native double representation.
919 // This is actually reasonable, since locals and stack arrays
920 // grow downwards in all implementations.
921 // (If, on some machine, the interpreter's Java locals or stack
922 // were to grow upwards, the embedded doubles would be word-swapped.)
923 jlong_accessor acc;
924 acc.long_value = jlong_cast(d);
925 array->append(new ConstantIntValue(acc.words[1]));
926 array->append(new ConstantIntValue(acc.words[0]));
927 #endif
928 break;
929 }
930 case Type::Long: {
931 jlong d = t->is_long()->get_con();
932 #ifdef _LP64
933 array->append(new ConstantIntValue((jint)0));
934 array->append(new ConstantLongValue(d));
935 #else
936 // Repack the long as two jints.
937 // The convention the interpreter uses is that the second local
938 // holds the first raw word of the native double representation.
939 // This is actually reasonable, since locals and stack arrays
940 // grow downwards in all implementations.
941 // (If, on some machine, the interpreter's Java locals or stack
942 // were to grow upwards, the embedded doubles would be word-swapped.)
943 jlong_accessor acc;
944 acc.long_value = d;
945 array->append(new ConstantIntValue(acc.words[1]));
946 array->append(new ConstantIntValue(acc.words[0]));
947 #endif
948 break;
949 }
950 case Type::Top: // Add an illegal value here
951 array->append(new LocationValue(Location()));
952 break;
953 default:
954 ShouldNotReachHere();
955 break;
956 }
957 }
958
959 // Determine if this node starts a bundle
960 bool PhaseOutput::starts_bundle(const Node *n) const {
961 return (_node_bundling_limit > n->_idx &&
962 _node_bundling_base[n->_idx].starts_bundle());
963 }
964
965 // Determine if there is a monitor that has 'ov' as its owner.
966 bool PhaseOutput::contains_as_owner(GrowableArray<MonitorValue*> *monarray, ObjectValue *ov) const {
967 for (int k = 0; k < monarray->length(); k++) {
968 MonitorValue* mv = monarray->at(k);
969 if (mv->owner() == ov) {
970 return true;
971 }
972 }
973
974 return false;
975 }
976
977 // Determine if there is a scalar replaced object description represented by 'ov'.
978 bool PhaseOutput::contains_as_scalarized_obj(JVMState* jvms, MachSafePointNode* sfn,
979 GrowableArray<ScopeValue*>* objs,
980 ObjectValue* ov) const {
981 for (int i = 0; i < jvms->scl_size(); i++) {
982 Node* n = sfn->scalarized_obj(jvms, i);
983 // Other kinds of nodes that we may encounter here, for instance constants
984 // representing values of fields of objects scalarized, aren't relevant for
985 // us, since they don't map to ObjectValue.
986 if (!n->is_SafePointScalarObject()) {
987 continue;
988 }
989
990 ObjectValue* other = (ObjectValue*) sv_for_node_id(objs, n->_idx);
991 if (ov == other) {
992 return true;
993 }
994 }
995 return false;
996 }
997
998 //--------------------------Process_OopMap_Node--------------------------------
999 void PhaseOutput::Process_OopMap_Node(MachNode *mach, int current_offset) {
1000 // Handle special safepoint nodes for synchronization
1001 MachSafePointNode *sfn = mach->as_MachSafePoint();
1002 MachCallNode *mcall;
1003
1004 int safepoint_pc_offset = current_offset;
1005 bool is_method_handle_invoke = false;
1006 bool return_oop = false;
1007 bool has_ea_local_in_scope = sfn->_has_ea_local_in_scope;
1008 bool arg_escape = false;
1009
1010 // Add the safepoint in the DebugInfoRecorder
1011 if( !mach->is_MachCall() ) {
1012 mcall = nullptr;
1013 C->debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map);
1014 } else {
1015 mcall = mach->as_MachCall();
1016
1017 // Is the call a MethodHandle call?
1018 if (mcall->is_MachCallJava()) {
1019 if (mcall->as_MachCallJava()->_method_handle_invoke) {
1020 assert(C->has_method_handle_invokes(), "must have been set during call generation");
1021 is_method_handle_invoke = true;
1022 }
1023 arg_escape = mcall->as_MachCallJava()->_arg_escape;
1024 }
1025
1026 // Check if a call returns an object.
1027 if (mcall->returns_pointer()) {
1028 return_oop = true;
1029 }
1030 safepoint_pc_offset += mcall->ret_addr_offset();
1031 C->debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map);
1032 }
1033
1034 // Loop over the JVMState list to add scope information
1035 // Do not skip safepoints with a null method, they need monitor info
1036 JVMState* youngest_jvms = sfn->jvms();
1037 int max_depth = youngest_jvms->depth();
1038
1039 // Allocate the object pool for scalar-replaced objects -- the map from
1040 // small-integer keys (which can be recorded in the local and ostack
1041 // arrays) to descriptions of the object state.
1042 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>();
1043
1044 // Visit scopes from oldest to youngest.
1045 for (int depth = 1; depth <= max_depth; depth++) {
1046 JVMState* jvms = youngest_jvms->of_depth(depth);
1047 int idx;
1048 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1049 // Safepoints that do not have method() set only provide oop-map and monitor info
1050 // to support GC; these do not support deoptimization.
1051 int num_locs = (method == nullptr) ? 0 : jvms->loc_size();
1052 int num_exps = (method == nullptr) ? 0 : jvms->stk_size();
1053 int num_mon = jvms->nof_monitors();
1054 assert(method == nullptr || jvms->bci() < 0 || num_locs == method->max_locals(),
1055 "JVMS local count must match that of the method");
1056
1057 // Add Local and Expression Stack Information
1058
1059 // Insert locals into the locarray
1060 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs);
1061 for( idx = 0; idx < num_locs; idx++ ) {
1062 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs );
1063 }
1064
1065 // Insert expression stack entries into the exparray
1066 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps);
1067 for( idx = 0; idx < num_exps; idx++ ) {
1068 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs );
1069 }
1070
1071 // Add in mappings of the monitors
1072 assert( !method ||
1073 !method->is_synchronized() ||
1074 method->is_native() ||
1075 num_mon > 0 ||
1076 !GenerateSynchronizationCode,
1077 "monitors must always exist for synchronized methods");
1078
1079 // Build the growable array of ScopeValues for exp stack
1080 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
1081
1082 // Loop over monitors and insert into array
1083 for (idx = 0; idx < num_mon; idx++) {
1084 // Grab the node that defines this monitor
1085 Node* box_node = sfn->monitor_box(jvms, idx);
1086 Node* obj_node = sfn->monitor_obj(jvms, idx);
1087
1088 // Create ScopeValue for object
1089 ScopeValue *scval = nullptr;
1090
1091 if (obj_node->is_SafePointScalarObject()) {
1092 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
1093 scval = PhaseOutput::sv_for_node_id(objs, spobj->_idx);
1094 if (scval == nullptr) {
1095 const Type *t = spobj->bottom_type();
1096 ciKlass* cik = t->is_oopptr()->exact_klass();
1097 assert(cik->is_instance_klass() ||
1098 cik->is_array_klass(), "Not supported allocation.");
1099 ObjectValue* sv = new ObjectValue(spobj->_idx,
1100 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
1101 PhaseOutput::set_sv_for_object_node(objs, sv);
1102
1103 uint first_ind = spobj->first_index(youngest_jvms);
1104 for (uint i = 0; i < spobj->n_fields(); i++) {
1105 Node* fld_node = sfn->in(first_ind+i);
1106 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
1107 }
1108 scval = sv;
1109 }
1110 } else if (obj_node->is_SafePointScalarMerge()) {
1111 SafePointScalarMergeNode* smerge = obj_node->as_SafePointScalarMerge();
1112 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
1113
1114 if (mv == nullptr) {
1115 GrowableArray<ScopeValue*> deps;
1116
1117 int merge_pointer_idx = smerge->merge_pointer_idx(youngest_jvms);
1118 FillLocArray(0, sfn, sfn->in(merge_pointer_idx), &deps, objs);
1119 assert(deps.length() == 1, "missing value");
1120
1121 int selector_idx = smerge->selector_idx(youngest_jvms);
1122 FillLocArray(1, nullptr, sfn->in(selector_idx), &deps, nullptr);
1123 assert(deps.length() == 2, "missing value");
1124
1125 mv = new ObjectMergeValue(smerge->_idx, deps.at(0), deps.at(1));
1126 set_sv_for_object_node(objs, mv);
1127
1128 for (uint i = 1; i < smerge->req(); i++) {
1129 Node* obj_node = smerge->in(i);
1130 FillLocArray(mv->possible_objects()->length(), sfn, obj_node, mv->possible_objects(), objs);
1131 }
1132 }
1133 scval = mv;
1134 } else if (!obj_node->is_Con()) {
1135 OptoReg::Name obj_reg = C->regalloc()->get_reg_first(obj_node);
1136 if( obj_node->bottom_type()->base() == Type::NarrowOop ) {
1137 scval = new_loc_value( C->regalloc(), obj_reg, Location::narrowoop );
1138 } else {
1139 scval = new_loc_value( C->regalloc(), obj_reg, Location::oop );
1140 }
1141 } else {
1142 const TypePtr *tp = obj_node->get_ptr_type();
1143 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding());
1144 }
1145
1146 OptoReg::Name box_reg = BoxLockNode::reg(box_node);
1147 Location basic_lock = Location::new_stk_loc(Location::normal,C->regalloc()->reg2offset(box_reg));
1148 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated());
1149 monarray->append(new MonitorValue(scval, basic_lock, eliminated));
1150 }
1151
1152 // Mark ObjectValue nodes as root nodes if they are directly
1153 // referenced in the JVMS.
1154 for (int i = 0; i < objs->length(); i++) {
1155 ScopeValue* sv = objs->at(i);
1156 if (sv->is_object_merge()) {
1157 ObjectMergeValue* merge = sv->as_ObjectMergeValue();
1158
1159 for (int j = 0; j< merge->possible_objects()->length(); j++) {
1160 ObjectValue* ov = merge->possible_objects()->at(j)->as_ObjectValue();
1161 bool is_root = locarray->contains(ov) ||
1162 exparray->contains(ov) ||
1163 contains_as_owner(monarray, ov) ||
1164 contains_as_scalarized_obj(jvms, sfn, objs, ov);
1165 ov->set_root(is_root);
1166 }
1167 }
1168 }
1169
1170 // We dump the object pool first, since deoptimization reads it in first.
1171 C->debug_info()->dump_object_pool(objs);
1172
1173 // Build first class objects to pass to scope
1174 DebugToken *locvals = C->debug_info()->create_scope_values(locarray);
1175 DebugToken *expvals = C->debug_info()->create_scope_values(exparray);
1176 DebugToken *monvals = C->debug_info()->create_monitor_values(monarray);
1177
1178 // Make method available for all Safepoints
1179 ciMethod* scope_method = method ? method : C->method();
1180 // Describe the scope here
1181 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
1182 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
1183 // Now we can describe the scope.
1184 methodHandle null_mh;
1185 bool rethrow_exception = false;
1186 C->debug_info()->describe_scope(
1187 safepoint_pc_offset,
1188 null_mh,
1189 scope_method,
1190 jvms->bci(),
1191 jvms->should_reexecute(),
1192 rethrow_exception,
1193 is_method_handle_invoke,
1194 return_oop,
1195 has_ea_local_in_scope,
1196 arg_escape,
1197 locvals,
1198 expvals,
1199 monvals
1200 );
1201 } // End jvms loop
1202
1203 // Mark the end of the scope set.
1204 C->debug_info()->end_safepoint(safepoint_pc_offset);
1205 }
1206
1207
1208
1209 // A simplified version of Process_OopMap_Node, to handle non-safepoints.
1210 class NonSafepointEmitter {
1211 Compile* C;
1212 JVMState* _pending_jvms;
1213 int _pending_offset;
1214
1215 void emit_non_safepoint();
1216
1217 public:
1218 NonSafepointEmitter(Compile* compile) {
1219 this->C = compile;
1220 _pending_jvms = nullptr;
1221 _pending_offset = 0;
1222 }
1223
1224 void observe_instruction(Node* n, int pc_offset) {
1225 if (!C->debug_info()->recording_non_safepoints()) return;
1226
1227 Node_Notes* nn = C->node_notes_at(n->_idx);
1228 if (nn == nullptr || nn->jvms() == nullptr) return;
1229 if (_pending_jvms != nullptr &&
1230 _pending_jvms->same_calls_as(nn->jvms())) {
1231 // Repeated JVMS? Stretch it up here.
1232 _pending_offset = pc_offset;
1233 } else {
1234 if (_pending_jvms != nullptr &&
1235 _pending_offset < pc_offset) {
1236 emit_non_safepoint();
1237 }
1238 _pending_jvms = nullptr;
1239 if (pc_offset > C->debug_info()->last_pc_offset()) {
1240 // This is the only way _pending_jvms can become non-null:
1241 _pending_jvms = nn->jvms();
1242 _pending_offset = pc_offset;
1243 }
1244 }
1245 }
1246
1247 // Stay out of the way of real safepoints:
1248 void observe_safepoint(JVMState* jvms, int pc_offset) {
1249 if (_pending_jvms != nullptr &&
1250 !_pending_jvms->same_calls_as(jvms) &&
1251 _pending_offset < pc_offset) {
1252 emit_non_safepoint();
1253 }
1254 _pending_jvms = nullptr;
1255 }
1256
1257 void flush_at_end() {
1258 if (_pending_jvms != nullptr) {
1259 emit_non_safepoint();
1260 }
1261 _pending_jvms = nullptr;
1262 }
1263 };
1264
1265 void NonSafepointEmitter::emit_non_safepoint() {
1266 JVMState* youngest_jvms = _pending_jvms;
1267 int pc_offset = _pending_offset;
1268
1269 // Clear it now:
1270 _pending_jvms = nullptr;
1271
1272 DebugInformationRecorder* debug_info = C->debug_info();
1273 assert(debug_info->recording_non_safepoints(), "sanity");
1274
1275 debug_info->add_non_safepoint(pc_offset);
1276 int max_depth = youngest_jvms->depth();
1277
1278 // Visit scopes from oldest to youngest.
1279 for (int depth = 1; depth <= max_depth; depth++) {
1280 JVMState* jvms = youngest_jvms->of_depth(depth);
1281 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1282 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest");
1283 methodHandle null_mh;
1284 debug_info->describe_scope(pc_offset, null_mh, method, jvms->bci(), jvms->should_reexecute());
1285 }
1286
1287 // Mark the end of the scope set.
1288 debug_info->end_non_safepoint(pc_offset);
1289 }
1290
1291 //------------------------------init_buffer------------------------------------
1292 void PhaseOutput::estimate_buffer_size(int& const_req) {
1293
1294 // Set the initially allocated size
1295 const_req = initial_const_capacity;
1296
1297 // The extra spacing after the code is necessary on some platforms.
1298 // Sometimes we need to patch in a jump after the last instruction,
1299 // if the nmethod has been deoptimized. (See 4932387, 4894843.)
1300
1301 // Compute the byte offset where we can store the deopt pc.
1302 if (C->fixed_slots() != 0) {
1303 _orig_pc_slot_offset_in_bytes = C->regalloc()->reg2offset(OptoReg::stack2reg(_orig_pc_slot));
1304 }
1305
1306 // Compute prolog code size
1307 _frame_slots = OptoReg::reg2stack(C->matcher()->_old_SP) + C->regalloc()->_framesize;
1308 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check");
1309
1310 if (C->has_mach_constant_base_node()) {
1311 uint add_size = 0;
1312 // Fill the constant table.
1313 // Note: This must happen before shorten_branches.
1314 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1315 Block* b = C->cfg()->get_block(i);
1316
1317 for (uint j = 0; j < b->number_of_nodes(); j++) {
1318 Node* n = b->get_node(j);
1319
1320 // If the node is a MachConstantNode evaluate the constant
1321 // value section.
1322 if (n->is_MachConstant()) {
1323 MachConstantNode* machcon = n->as_MachConstant();
1324 machcon->eval_constant(C);
1325 } else if (n->is_Mach()) {
1326 // On Power there are more nodes that issue constants.
1327 add_size += (n->as_Mach()->ins_num_consts() * 8);
1328 }
1329 }
1330 }
1331
1332 // Calculate the offsets of the constants and the size of the
1333 // constant table (including the padding to the next section).
1334 constant_table().calculate_offsets_and_size();
1335 const_req = constant_table().size() + add_size;
1336 }
1337
1338 // Initialize the space for the BufferBlob used to find and verify
1339 // instruction size in MachNode::emit_size()
1340 init_scratch_buffer_blob(const_req);
1341 }
1342
1343 CodeBuffer* PhaseOutput::init_buffer() {
1344 int stub_req = _buf_sizes._stub;
1345 int code_req = _buf_sizes._code;
1346 int const_req = _buf_sizes._const;
1347
1348 int pad_req = NativeCall::byte_size();
1349
1350 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1351 stub_req += bs->estimate_stub_size();
1352
1353 // nmethod and CodeBuffer count stubs & constants as part of method's code.
1354 // class HandlerImpl is platform-specific and defined in the *.ad files.
1355 int exception_handler_req = HandlerImpl::size_exception_handler() + MAX_stubs_size; // add marginal slop for handler
1356 int deopt_handler_req = HandlerImpl::size_deopt_handler() + MAX_stubs_size; // add marginal slop for handler
1357 stub_req += MAX_stubs_size; // ensure per-stub margin
1358 code_req += MAX_inst_size; // ensure per-instruction margin
1359
1360 if (StressCodeBuffers)
1361 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion
1362
1363 int total_req =
1364 const_req +
1365 code_req +
1366 pad_req +
1367 stub_req +
1368 exception_handler_req +
1369 deopt_handler_req; // deopt handler
1370
1371 if (C->has_method_handle_invokes())
1372 total_req += deopt_handler_req; // deopt MH handler
1373
1374 CodeBuffer* cb = code_buffer();
1375 cb->initialize(total_req, _buf_sizes._reloc);
1376
1377 // Have we run out of code space?
1378 if ((cb->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1379 C->record_failure("CodeCache is full");
1380 return nullptr;
1381 }
1382 // Configure the code buffer.
1383 cb->initialize_consts_size(const_req);
1384 cb->initialize_stubs_size(stub_req);
1385 cb->initialize_oop_recorder(C->env()->oop_recorder());
1386
1387 // fill in the nop array for bundling computations
1388 MachNode *_nop_list[Bundle::_nop_count];
1389 Bundle::initialize_nops(_nop_list);
1390
1391 return cb;
1392 }
1393
1394 //------------------------------fill_buffer------------------------------------
1395 void PhaseOutput::fill_buffer(C2_MacroAssembler* masm, uint* blk_starts) {
1396 // blk_starts[] contains offsets calculated during short branches processing,
1397 // offsets should not be increased during following steps.
1398
1399 // Compute the size of first NumberOfLoopInstrToAlign instructions at head
1400 // of a loop. It is used to determine the padding for loop alignment.
1401 Compile::TracePhase tp("fill buffer", &timers[_t_fillBuffer]);
1402
1403 compute_loop_first_inst_sizes();
1404
1405 // Create oopmap set.
1406 _oop_map_set = new OopMapSet();
1407
1408 // !!!!! This preserves old handling of oopmaps for now
1409 C->debug_info()->set_oopmaps(_oop_map_set);
1410
1411 uint nblocks = C->cfg()->number_of_blocks();
1412 // Count and start of implicit null check instructions
1413 uint inct_cnt = 0;
1414 uint* inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1415
1416 // Count and start of calls
1417 uint* call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1418
1419 uint return_offset = 0;
1420 int nop_size = (new MachNopNode())->size(C->regalloc());
1421
1422 int previous_offset = 0;
1423 int current_offset = 0;
1424 int last_call_offset = -1;
1425 int last_avoid_back_to_back_offset = -1;
1426 #ifdef ASSERT
1427 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks);
1428 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
1429 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
1430 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks);
1431 #endif
1432
1433 // Create an array of unused labels, one for each basic block, if printing is enabled
1434 #if defined(SUPPORT_OPTO_ASSEMBLY)
1435 int* node_offsets = nullptr;
1436 uint node_offset_limit = C->unique();
1437
1438 if (C->print_assembly()) {
1439 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit);
1440 }
1441 if (node_offsets != nullptr) {
1442 // We need to initialize. Unused array elements may contain garbage and mess up PrintOptoAssembly.
1443 memset(node_offsets, 0, node_offset_limit*sizeof(int));
1444 }
1445 #endif
1446
1447 NonSafepointEmitter non_safepoints(C); // emit non-safepoints lazily
1448
1449 // Emit the constant table.
1450 if (C->has_mach_constant_base_node()) {
1451 if (!constant_table().emit(masm)) {
1452 C->record_failure("consts section overflow");
1453 return;
1454 }
1455 }
1456
1457 // Create an array of labels, one for each basic block
1458 Label* blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1);
1459 for (uint i = 0; i <= nblocks; i++) {
1460 blk_labels[i].init();
1461 }
1462
1463 // Now fill in the code buffer
1464 Node* delay_slot = nullptr;
1465 for (uint i = 0; i < nblocks; i++) {
1466 Block* block = C->cfg()->get_block(i);
1467 _block = block;
1468 Node* head = block->head();
1469
1470 // If this block needs to start aligned (i.e, can be reached other
1471 // than by falling-thru from the previous block), then force the
1472 // start of a new bundle.
1473 if (Pipeline::requires_bundling() && starts_bundle(head)) {
1474 masm->code()->flush_bundle(true);
1475 }
1476
1477 #ifdef ASSERT
1478 if (!block->is_connector()) {
1479 stringStream st;
1480 block->dump_head(C->cfg(), &st);
1481 masm->block_comment(st.freeze());
1482 }
1483 jmp_target[i] = 0;
1484 jmp_offset[i] = 0;
1485 jmp_size[i] = 0;
1486 jmp_rule[i] = 0;
1487 #endif
1488 int blk_offset = current_offset;
1489
1490 // Define the label at the beginning of the basic block
1491 masm->bind(blk_labels[block->_pre_order]);
1492
1493 uint last_inst = block->number_of_nodes();
1494
1495 // Emit block normally, except for last instruction.
1496 // Emit means "dump code bits into code buffer".
1497 for (uint j = 0; j<last_inst; j++) {
1498 _index = j;
1499
1500 // Get the node
1501 Node* n = block->get_node(j);
1502
1503 // See if delay slots are supported
1504 if (valid_bundle_info(n) && node_bundling(n)->used_in_unconditional_delay()) {
1505 assert(delay_slot == nullptr, "no use of delay slot node");
1506 assert(n->size(C->regalloc()) == Pipeline::instr_unit_size(), "delay slot instruction wrong size");
1507
1508 delay_slot = n;
1509 continue;
1510 }
1511
1512 // If this starts a new instruction group, then flush the current one
1513 // (but allow split bundles)
1514 if (Pipeline::requires_bundling() && starts_bundle(n))
1515 masm->code()->flush_bundle(false);
1516
1517 // Special handling for SafePoint/Call Nodes
1518 bool is_mcall = false;
1519 if (n->is_Mach()) {
1520 MachNode *mach = n->as_Mach();
1521 is_mcall = n->is_MachCall();
1522 bool is_sfn = n->is_MachSafePoint();
1523
1524 // If this requires all previous instructions be flushed, then do so
1525 if (is_sfn || is_mcall || mach->alignment_required() != 1) {
1526 masm->code()->flush_bundle(true);
1527 current_offset = masm->offset();
1528 }
1529
1530 // A padding may be needed again since a previous instruction
1531 // could be moved to delay slot.
1532
1533 // align the instruction if necessary
1534 int padding = mach->compute_padding(current_offset);
1535 // Make sure safepoint node for polling is distinct from a call's
1536 // return by adding a nop if needed.
1537 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) {
1538 padding = nop_size;
1539 }
1540 if (padding == 0 && mach->avoid_back_to_back(MachNode::AVOID_BEFORE) &&
1541 current_offset == last_avoid_back_to_back_offset) {
1542 // Avoid back to back some instructions.
1543 padding = nop_size;
1544 }
1545
1546 if (padding > 0) {
1547 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size");
1548 int nops_cnt = padding / nop_size;
1549 MachNode *nop = new MachNopNode(nops_cnt);
1550 block->insert_node(nop, j++);
1551 last_inst++;
1552 C->cfg()->map_node_to_block(nop, block);
1553 // Ensure enough space.
1554 masm->code()->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
1555 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1556 C->record_failure("CodeCache is full");
1557 return;
1558 }
1559 nop->emit(masm, C->regalloc());
1560 masm->code()->flush_bundle(true);
1561 current_offset = masm->offset();
1562 }
1563
1564 bool observe_safepoint = is_sfn;
1565 // Remember the start of the last call in a basic block
1566 if (is_mcall) {
1567 MachCallNode *mcall = mach->as_MachCall();
1568
1569 // This destination address is NOT PC-relative
1570 mcall->method_set((intptr_t)mcall->entry_point());
1571
1572 // Save the return address
1573 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset();
1574
1575 observe_safepoint = mcall->guaranteed_safepoint();
1576 }
1577
1578 // sfn will be valid whenever mcall is valid now because of inheritance
1579 if (observe_safepoint) {
1580 // Handle special safepoint nodes for synchronization
1581 if (!is_mcall) {
1582 MachSafePointNode *sfn = mach->as_MachSafePoint();
1583 // !!!!! Stubs only need an oopmap right now, so bail out
1584 if (sfn->jvms()->method() == nullptr) {
1585 // Write the oopmap directly to the code blob??!!
1586 continue;
1587 }
1588 } // End synchronization
1589
1590 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1591 current_offset);
1592 Process_OopMap_Node(mach, current_offset);
1593 } // End if safepoint
1594
1595 // If this is a null check, then add the start of the previous instruction to the list
1596 else if( mach->is_MachNullCheck() ) {
1597 inct_starts[inct_cnt++] = previous_offset;
1598 }
1599
1600 // If this is a branch, then fill in the label with the target BB's label
1601 else if (mach->is_MachBranch()) {
1602 // This requires the TRUE branch target be in succs[0]
1603 uint block_num = block->non_connector_successor(0)->_pre_order;
1604
1605 // Try to replace long branch if delay slot is not used,
1606 // it is mostly for back branches since forward branch's
1607 // distance is not updated yet.
1608 bool delay_slot_is_used = valid_bundle_info(n) &&
1609 C->output()->node_bundling(n)->use_unconditional_delay();
1610 if (!delay_slot_is_used && mach->may_be_short_branch()) {
1611 assert(delay_slot == nullptr, "not expecting delay slot node");
1612 int br_size = n->size(C->regalloc());
1613 int offset = blk_starts[block_num] - current_offset;
1614 if (block_num >= i) {
1615 // Current and following block's offset are not
1616 // finalized yet, adjust distance by the difference
1617 // between calculated and final offsets of current block.
1618 offset -= (blk_starts[i] - blk_offset);
1619 }
1620 // In the following code a nop could be inserted before
1621 // the branch which will increase the backward distance.
1622 bool needs_padding = (current_offset == last_avoid_back_to_back_offset);
1623 if (needs_padding && offset <= 0)
1624 offset -= nop_size;
1625
1626 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
1627 // We've got a winner. Replace this branch.
1628 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
1629
1630 // Update the jmp_size.
1631 int new_size = replacement->size(C->regalloc());
1632 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller");
1633 // Insert padding between avoid_back_to_back branches.
1634 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
1635 MachNode *nop = new MachNopNode();
1636 block->insert_node(nop, j++);
1637 C->cfg()->map_node_to_block(nop, block);
1638 last_inst++;
1639 nop->emit(masm, C->regalloc());
1640 masm->code()->flush_bundle(true);
1641 current_offset = masm->offset();
1642 }
1643 #ifdef ASSERT
1644 jmp_target[i] = block_num;
1645 jmp_offset[i] = current_offset - blk_offset;
1646 jmp_size[i] = new_size;
1647 jmp_rule[i] = mach->rule();
1648 #endif
1649 block->map_node(replacement, j);
1650 mach->subsume_by(replacement, C);
1651 n = replacement;
1652 mach = replacement;
1653 }
1654 }
1655 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num );
1656 } else if (mach->ideal_Opcode() == Op_Jump) {
1657 for (uint h = 0; h < block->_num_succs; h++) {
1658 Block* succs_block = block->_succs[h];
1659 for (uint j = 1; j < succs_block->num_preds(); j++) {
1660 Node* jpn = succs_block->pred(j);
1661 if (jpn->is_JumpProj() && jpn->in(0) == mach) {
1662 uint block_num = succs_block->non_connector()->_pre_order;
1663 Label *blkLabel = &blk_labels[block_num];
1664 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel);
1665 }
1666 }
1667 }
1668 }
1669 #ifdef ASSERT
1670 // Check that oop-store precedes the card-mark
1671 else if (mach->ideal_Opcode() == Op_StoreCM) {
1672 uint storeCM_idx = j;
1673 int count = 0;
1674 for (uint prec = mach->req(); prec < mach->len(); prec++) {
1675 Node *oop_store = mach->in(prec); // Precedence edge
1676 if (oop_store == nullptr) continue;
1677 count++;
1678 uint i4;
1679 for (i4 = 0; i4 < last_inst; ++i4) {
1680 if (block->get_node(i4) == oop_store) {
1681 break;
1682 }
1683 }
1684 // Note: This test can provide a false failure if other precedence
1685 // edges have been added to the storeCMNode.
1686 assert(i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store");
1687 }
1688 assert(count > 0, "storeCM expects at least one precedence edge");
1689 }
1690 #endif
1691 else if (!n->is_Proj()) {
1692 // Remember the beginning of the previous instruction, in case
1693 // it's followed by a flag-kill and a null-check. Happens on
1694 // Intel all the time, with add-to-memory kind of opcodes.
1695 previous_offset = current_offset;
1696 }
1697
1698 // Not an else-if!
1699 // If this is a trap based cmp then add its offset to the list.
1700 if (mach->is_TrapBasedCheckNode()) {
1701 inct_starts[inct_cnt++] = current_offset;
1702 }
1703 }
1704
1705 // Verify that there is sufficient space remaining
1706 masm->code()->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
1707 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1708 C->record_failure("CodeCache is full");
1709 return;
1710 }
1711
1712 // Save the offset for the listing
1713 #if defined(SUPPORT_OPTO_ASSEMBLY)
1714 if ((node_offsets != nullptr) && (n->_idx < node_offset_limit)) {
1715 node_offsets[n->_idx] = masm->offset();
1716 }
1717 #endif
1718 assert(!C->failing(), "Should not reach here if failing.");
1719
1720 // "Normal" instruction case
1721 DEBUG_ONLY(uint instr_offset = masm->offset());
1722 n->emit(masm, C->regalloc());
1723 current_offset = masm->offset();
1724
1725 // Above we only verified that there is enough space in the instruction section.
1726 // However, the instruction may emit stubs that cause code buffer expansion.
1727 // Bail out here if expansion failed due to a lack of code cache space.
1728 if (C->failing()) {
1729 return;
1730 }
1731
1732 assert(!is_mcall || (call_returns[block->_pre_order] <= (uint)current_offset),
1733 "ret_addr_offset() not within emitted code");
1734
1735 #ifdef ASSERT
1736 uint n_size = n->size(C->regalloc());
1737 if (n_size < (current_offset-instr_offset)) {
1738 MachNode* mach = n->as_Mach();
1739 n->dump();
1740 mach->dump_format(C->regalloc(), tty);
1741 tty->print_cr(" n_size (%d), current_offset (%d), instr_offset (%d)", n_size, current_offset, instr_offset);
1742 Disassembler::decode(masm->code()->insts_begin() + instr_offset, masm->code()->insts_begin() + current_offset + 1, tty);
1743 tty->print_cr(" ------------------- ");
1744 BufferBlob* blob = this->scratch_buffer_blob();
1745 address blob_begin = blob->content_begin();
1746 Disassembler::decode(blob_begin, blob_begin + n_size + 1, tty);
1747 assert(false, "wrong size of mach node");
1748 }
1749 #endif
1750 non_safepoints.observe_instruction(n, current_offset);
1751
1752 // mcall is last "call" that can be a safepoint
1753 // record it so we can see if a poll will directly follow it
1754 // in which case we'll need a pad to make the PcDesc sites unique
1755 // see 5010568. This can be slightly inaccurate but conservative
1756 // in the case that return address is not actually at current_offset.
1757 // This is a small price to pay.
1758
1759 if (is_mcall) {
1760 last_call_offset = current_offset;
1761 }
1762
1763 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
1764 // Avoid back to back some instructions.
1765 last_avoid_back_to_back_offset = current_offset;
1766 }
1767
1768 // See if this instruction has a delay slot
1769 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
1770 guarantee(delay_slot != nullptr, "expecting delay slot node");
1771
1772 // Back up 1 instruction
1773 masm->code()->set_insts_end(masm->code()->insts_end() - Pipeline::instr_unit_size());
1774
1775 // Save the offset for the listing
1776 #if defined(SUPPORT_OPTO_ASSEMBLY)
1777 if ((node_offsets != nullptr) && (delay_slot->_idx < node_offset_limit)) {
1778 node_offsets[delay_slot->_idx] = masm->offset();
1779 }
1780 #endif
1781
1782 // Support a SafePoint in the delay slot
1783 if (delay_slot->is_MachSafePoint()) {
1784 MachNode *mach = delay_slot->as_Mach();
1785 // !!!!! Stubs only need an oopmap right now, so bail out
1786 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == nullptr) {
1787 // Write the oopmap directly to the code blob??!!
1788 delay_slot = nullptr;
1789 continue;
1790 }
1791
1792 int adjusted_offset = current_offset - Pipeline::instr_unit_size();
1793 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1794 adjusted_offset);
1795 // Generate an OopMap entry
1796 Process_OopMap_Node(mach, adjusted_offset);
1797 }
1798
1799 // Insert the delay slot instruction
1800 delay_slot->emit(masm, C->regalloc());
1801
1802 // Don't reuse it
1803 delay_slot = nullptr;
1804 }
1805
1806 } // End for all instructions in block
1807
1808 // If the next block is the top of a loop, pad this block out to align
1809 // the loop top a little. Helps prevent pipe stalls at loop back branches.
1810 if (i < nblocks-1) {
1811 Block *nb = C->cfg()->get_block(i + 1);
1812 int padding = nb->alignment_padding(current_offset);
1813 if( padding > 0 ) {
1814 MachNode *nop = new MachNopNode(padding / nop_size);
1815 block->insert_node(nop, block->number_of_nodes());
1816 C->cfg()->map_node_to_block(nop, block);
1817 nop->emit(masm, C->regalloc());
1818 current_offset = masm->offset();
1819 }
1820 }
1821 // Verify that the distance for generated before forward
1822 // short branches is still valid.
1823 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size");
1824
1825 // Save new block start offset
1826 blk_starts[i] = blk_offset;
1827 } // End of for all blocks
1828 blk_starts[nblocks] = current_offset;
1829
1830 non_safepoints.flush_at_end();
1831
1832 // Offset too large?
1833 if (C->failing()) return;
1834
1835 // Define a pseudo-label at the end of the code
1836 masm->bind( blk_labels[nblocks] );
1837
1838 // Compute the size of the first block
1839 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos();
1840
1841 #ifdef ASSERT
1842 for (uint i = 0; i < nblocks; i++) { // For all blocks
1843 if (jmp_target[i] != 0) {
1844 int br_size = jmp_size[i];
1845 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
1846 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
1847 tty->print_cr("target (%d) - jmp_offset(%d) = offset (%d), jump_size(%d), jmp_block B%d, target_block B%d", blk_starts[jmp_target[i]], blk_starts[i] + jmp_offset[i], offset, br_size, i, jmp_target[i]);
1848 assert(false, "Displacement too large for short jmp");
1849 }
1850 }
1851 }
1852 #endif
1853
1854 if (!masm->code()->finalize_stubs()) {
1855 C->record_failure("CodeCache is full");
1856 return;
1857 }
1858
1859 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1860 bs->emit_stubs(*masm->code());
1861 if (C->failing()) return;
1862
1863 // Fill in stubs.
1864 assert(masm->inst_mark() == nullptr, "should be.");
1865 _stub_list.emit(*masm);
1866 if (C->failing()) return;
1867
1868 #ifndef PRODUCT
1869 // Information on the size of the method, without the extraneous code
1870 Scheduling::increment_method_size(masm->offset());
1871 #endif
1872
1873 // ------------------
1874 // Fill in exception table entries.
1875 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels);
1876
1877 // Only java methods have exception handlers and deopt handlers
1878 // class HandlerImpl is platform-specific and defined in the *.ad files.
1879 if (C->method()) {
1880 // Emit the exception handler code.
1881 _code_offsets.set_value(CodeOffsets::Exceptions, HandlerImpl::emit_exception_handler(masm));
1882 if (C->failing()) {
1883 return; // CodeBuffer::expand failed
1884 }
1885 // Emit the deopt handler code.
1886 _code_offsets.set_value(CodeOffsets::Deopt, HandlerImpl::emit_deopt_handler(masm));
1887
1888 // Emit the MethodHandle deopt handler code (if required).
1889 if (C->has_method_handle_invokes() && !C->failing()) {
1890 // We can use the same code as for the normal deopt handler, we
1891 // just need a different entry point address.
1892 _code_offsets.set_value(CodeOffsets::DeoptMH, HandlerImpl::emit_deopt_handler(masm));
1893 }
1894 }
1895
1896 // One last check for failed CodeBuffer::expand:
1897 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1898 C->record_failure("CodeCache is full");
1899 return;
1900 }
1901
1902 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) || defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_OPTO_ASSEMBLY)
1903 if (C->print_assembly()) {
1904 tty->cr();
1905 tty->print_cr("============================= C2-compiled nmethod ==============================");
1906 }
1907 #endif
1908
1909 #if defined(SUPPORT_OPTO_ASSEMBLY)
1910 // Dump the assembly code, including basic-block numbers
1911 if (C->print_assembly()) {
1912 ttyLocker ttyl; // keep the following output all in one block
1913 if (!VMThread::should_terminate()) { // test this under the tty lock
1914 // print_metadata and dump_asm may safepoint which makes us loose the ttylock.
1915 // We call them first and write to a stringStream, then we retake the lock to
1916 // make sure the end tag is coherent, and that xmlStream->pop_tag is done thread safe.
1917 ResourceMark rm;
1918 stringStream method_metadata_str;
1919 if (C->method() != nullptr) {
1920 C->method()->print_metadata(&method_metadata_str);
1921 }
1922 stringStream dump_asm_str;
1923 dump_asm_on(&dump_asm_str, node_offsets, node_offset_limit);
1924
1925 NoSafepointVerifier nsv;
1926 ttyLocker ttyl2;
1927 // This output goes directly to the tty, not the compiler log.
1928 // To enable tools to match it up with the compilation activity,
1929 // be sure to tag this tty output with the compile ID.
1930 if (xtty != nullptr) {
1931 xtty->head("opto_assembly compile_id='%d'%s", C->compile_id(),
1932 C->is_osr_compilation() ? " compile_kind='osr'" : "");
1933 }
1934 if (C->method() != nullptr) {
1935 tty->print_cr("----------------------- MetaData before Compile_id = %d ------------------------", C->compile_id());
1936 tty->print_raw(method_metadata_str.freeze());
1937 } else if (C->stub_name() != nullptr) {
1938 tty->print_cr("----------------------------- RuntimeStub %s -------------------------------", C->stub_name());
1939 }
1940 tty->cr();
1941 tty->print_cr("------------------------ OptoAssembly for Compile_id = %d -----------------------", C->compile_id());
1942 tty->print_raw(dump_asm_str.freeze());
1943 tty->print_cr("--------------------------------------------------------------------------------");
1944 if (xtty != nullptr) {
1945 xtty->tail("opto_assembly");
1946 }
1947 }
1948 }
1949 #endif
1950 }
1951
1952 void PhaseOutput::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) {
1953 _inc_table.set_size(cnt);
1954
1955 uint inct_cnt = 0;
1956 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1957 Block* block = C->cfg()->get_block(i);
1958 Node *n = nullptr;
1959 int j;
1960
1961 // Find the branch; ignore trailing NOPs.
1962 for (j = block->number_of_nodes() - 1; j >= 0; j--) {
1963 n = block->get_node(j);
1964 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) {
1965 break;
1966 }
1967 }
1968
1969 // If we didn't find anything, continue
1970 if (j < 0) {
1971 continue;
1972 }
1973
1974 // Compute ExceptionHandlerTable subtable entry and add it
1975 // (skip empty blocks)
1976 if (n->is_Catch()) {
1977
1978 // Get the offset of the return from the call
1979 uint call_return = call_returns[block->_pre_order];
1980 #ifdef ASSERT
1981 assert( call_return > 0, "no call seen for this basic block" );
1982 while (block->get_node(--j)->is_MachProj()) ;
1983 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call");
1984 #endif
1985 // last instruction is a CatchNode, find it's CatchProjNodes
1986 int nof_succs = block->_num_succs;
1987 // allocate space
1988 GrowableArray<intptr_t> handler_bcis(nof_succs);
1989 GrowableArray<intptr_t> handler_pcos(nof_succs);
1990 // iterate through all successors
1991 for (int j = 0; j < nof_succs; j++) {
1992 Block* s = block->_succs[j];
1993 bool found_p = false;
1994 for (uint k = 1; k < s->num_preds(); k++) {
1995 Node* pk = s->pred(k);
1996 if (pk->is_CatchProj() && pk->in(0) == n) {
1997 const CatchProjNode* p = pk->as_CatchProj();
1998 found_p = true;
1999 // add the corresponding handler bci & pco information
2000 if (p->_con != CatchProjNode::fall_through_index) {
2001 // p leads to an exception handler (and is not fall through)
2002 assert(s == C->cfg()->get_block(s->_pre_order), "bad numbering");
2003 // no duplicates, please
2004 if (!handler_bcis.contains(p->handler_bci())) {
2005 uint block_num = s->non_connector()->_pre_order;
2006 handler_bcis.append(p->handler_bci());
2007 handler_pcos.append(blk_labels[block_num].loc_pos());
2008 }
2009 }
2010 }
2011 }
2012 assert(found_p, "no matching predecessor found");
2013 // Note: Due to empty block removal, one block may have
2014 // several CatchProj inputs, from the same Catch.
2015 }
2016
2017 // Set the offset of the return from the call
2018 assert(handler_bcis.find(-1) != -1, "must have default handler");
2019 _handler_table.add_subtable(call_return, &handler_bcis, nullptr, &handler_pcos);
2020 continue;
2021 }
2022
2023 // Handle implicit null exception table updates
2024 if (n->is_MachNullCheck()) {
2025 uint block_num = block->non_connector_successor(0)->_pre_order;
2026 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2027 continue;
2028 }
2029 // Handle implicit exception table updates: trap instructions.
2030 if (n->is_Mach() && n->as_Mach()->is_TrapBasedCheckNode()) {
2031 uint block_num = block->non_connector_successor(0)->_pre_order;
2032 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2033 continue;
2034 }
2035 } // End of for all blocks fill in exception table entries
2036 }
2037
2038 // Static Variables
2039 #ifndef PRODUCT
2040 uint Scheduling::_total_nop_size = 0;
2041 uint Scheduling::_total_method_size = 0;
2042 uint Scheduling::_total_branches = 0;
2043 uint Scheduling::_total_unconditional_delays = 0;
2044 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
2045 #endif
2046
2047 // Initializer for class Scheduling
2048
2049 Scheduling::Scheduling(Arena *arena, Compile &compile)
2050 : _arena(arena),
2051 _cfg(compile.cfg()),
2052 _regalloc(compile.regalloc()),
2053 _scheduled(arena),
2054 _available(arena),
2055 _reg_node(arena),
2056 _pinch_free_list(arena),
2057 _next_node(nullptr),
2058 _bundle_instr_count(0),
2059 _bundle_cycle_number(0),
2060 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0])
2061 #ifndef PRODUCT
2062 , _branches(0)
2063 , _unconditional_delays(0)
2064 #endif
2065 {
2066 // Create a MachNopNode
2067 _nop = new MachNopNode();
2068
2069 // Now that the nops are in the array, save the count
2070 // (but allow entries for the nops)
2071 _node_bundling_limit = compile.unique();
2072 uint node_max = _regalloc->node_regs_max_index();
2073
2074 compile.output()->set_node_bundling_limit(_node_bundling_limit);
2075
2076 // This one is persistent within the Compile class
2077 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max);
2078
2079 // Allocate space for fixed-size arrays
2080 _uses = NEW_ARENA_ARRAY(arena, short, node_max);
2081 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
2082
2083 // Clear the arrays
2084 for (uint i = 0; i < node_max; i++) {
2085 ::new (&_node_bundling_base[i]) Bundle();
2086 }
2087 memset(_uses, 0, node_max * sizeof(short));
2088 memset(_current_latency, 0, node_max * sizeof(unsigned short));
2089
2090 // Clear the bundling information
2091 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements));
2092
2093 // Get the last node
2094 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1);
2095
2096 _next_node = block->get_node(block->number_of_nodes() - 1);
2097 }
2098
2099 #ifndef PRODUCT
2100 // Scheduling destructor
2101 Scheduling::~Scheduling() {
2102 _total_branches += _branches;
2103 _total_unconditional_delays += _unconditional_delays;
2104 }
2105 #endif
2106
2107 // Step ahead "i" cycles
2108 void Scheduling::step(uint i) {
2109
2110 Bundle *bundle = node_bundling(_next_node);
2111 bundle->set_starts_bundle();
2112
2113 // Update the bundle record, but leave the flags information alone
2114 if (_bundle_instr_count > 0) {
2115 bundle->set_instr_count(_bundle_instr_count);
2116 bundle->set_resources_used(_bundle_use.resourcesUsed());
2117 }
2118
2119 // Update the state information
2120 _bundle_instr_count = 0;
2121 _bundle_cycle_number += i;
2122 _bundle_use.step(i);
2123 }
2124
2125 void Scheduling::step_and_clear() {
2126 Bundle *bundle = node_bundling(_next_node);
2127 bundle->set_starts_bundle();
2128
2129 // Update the bundle record
2130 if (_bundle_instr_count > 0) {
2131 bundle->set_instr_count(_bundle_instr_count);
2132 bundle->set_resources_used(_bundle_use.resourcesUsed());
2133
2134 _bundle_cycle_number += 1;
2135 }
2136
2137 // Clear the bundling information
2138 _bundle_instr_count = 0;
2139 _bundle_use.reset();
2140
2141 memcpy(_bundle_use_elements,
2142 Pipeline_Use::elaborated_elements,
2143 sizeof(Pipeline_Use::elaborated_elements));
2144 }
2145
2146 // Perform instruction scheduling and bundling over the sequence of
2147 // instructions in backwards order.
2148 void PhaseOutput::ScheduleAndBundle() {
2149
2150 // Don't optimize this if it isn't a method
2151 if (!C->method())
2152 return;
2153
2154 // Don't optimize this if scheduling is disabled
2155 if (!C->do_scheduling())
2156 return;
2157
2158 // Scheduling code works only with pairs (8 bytes) maximum.
2159 // And when the scalable vector register is used, we may spill/unspill
2160 // the whole reg regardless of the max vector size.
2161 if (C->max_vector_size() > 8 ||
2162 (C->max_vector_size() > 0 && Matcher::supports_scalable_vector())) {
2163 return;
2164 }
2165
2166 Compile::TracePhase tp("isched", &timers[_t_instrSched]);
2167
2168 // Create a data structure for all the scheduling information
2169 Scheduling scheduling(Thread::current()->resource_area(), *C);
2170
2171 // Walk backwards over each basic block, computing the needed alignment
2172 // Walk over all the basic blocks
2173 scheduling.DoScheduling();
2174
2175 #ifndef PRODUCT
2176 if (C->trace_opto_output()) {
2177 // Buffer and print all at once
2178 ResourceMark rm;
2179 stringStream ss;
2180 ss.print("\n---- After ScheduleAndBundle ----\n");
2181 print_scheduling(&ss);
2182 tty->print("%s", ss.as_string());
2183 }
2184 #endif
2185 }
2186
2187 #ifndef PRODUCT
2188 // Separated out so that it can be called directly from debugger
2189 void PhaseOutput::print_scheduling() {
2190 print_scheduling(tty);
2191 }
2192
2193 void PhaseOutput::print_scheduling(outputStream* output_stream) {
2194 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
2195 output_stream->print("\nBB#%03d:\n", i);
2196 Block* block = C->cfg()->get_block(i);
2197 for (uint j = 0; j < block->number_of_nodes(); j++) {
2198 Node* n = block->get_node(j);
2199 OptoReg::Name reg = C->regalloc()->get_reg_first(n);
2200 output_stream->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : "");
2201 n->dump("\n", false, output_stream);
2202 }
2203 }
2204 }
2205 #endif
2206
2207 // See if this node fits into the present instruction bundle
2208 bool Scheduling::NodeFitsInBundle(Node *n) {
2209 uint n_idx = n->_idx;
2210
2211 // If this is the unconditional delay instruction, then it fits
2212 if (n == _unconditional_delay_slot) {
2213 #ifndef PRODUCT
2214 if (_cfg->C->trace_opto_output())
2215 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx);
2216 #endif
2217 return (true);
2218 }
2219
2220 // If the node cannot be scheduled this cycle, skip it
2221 if (_current_latency[n_idx] > _bundle_cycle_number) {
2222 #ifndef PRODUCT
2223 if (_cfg->C->trace_opto_output())
2224 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n",
2225 n->_idx, _current_latency[n_idx], _bundle_cycle_number);
2226 #endif
2227 return (false);
2228 }
2229
2230 const Pipeline *node_pipeline = n->pipeline();
2231
2232 uint instruction_count = node_pipeline->instructionCount();
2233 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2234 instruction_count = 0;
2235 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2236 instruction_count++;
2237
2238 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) {
2239 #ifndef PRODUCT
2240 if (_cfg->C->trace_opto_output())
2241 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n",
2242 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle);
2243 #endif
2244 return (false);
2245 }
2246
2247 // Don't allow non-machine nodes to be handled this way
2248 if (!n->is_Mach() && instruction_count == 0)
2249 return (false);
2250
2251 // See if there is any overlap
2252 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse());
2253
2254 if (delay > 0) {
2255 #ifndef PRODUCT
2256 if (_cfg->C->trace_opto_output())
2257 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx);
2258 #endif
2259 return false;
2260 }
2261
2262 #ifndef PRODUCT
2263 if (_cfg->C->trace_opto_output())
2264 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx);
2265 #endif
2266
2267 return true;
2268 }
2269
2270 Node * Scheduling::ChooseNodeToBundle() {
2271 uint siz = _available.size();
2272
2273 if (siz == 0) {
2274
2275 #ifndef PRODUCT
2276 if (_cfg->C->trace_opto_output())
2277 tty->print("# ChooseNodeToBundle: null\n");
2278 #endif
2279 return (nullptr);
2280 }
2281
2282 // Fast path, if only 1 instruction in the bundle
2283 if (siz == 1) {
2284 #ifndef PRODUCT
2285 if (_cfg->C->trace_opto_output()) {
2286 tty->print("# ChooseNodeToBundle (only 1): ");
2287 _available[0]->dump();
2288 }
2289 #endif
2290 return (_available[0]);
2291 }
2292
2293 // Don't bother, if the bundle is already full
2294 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) {
2295 for ( uint i = 0; i < siz; i++ ) {
2296 Node *n = _available[i];
2297
2298 // Skip projections, we'll handle them another way
2299 if (n->is_Proj())
2300 continue;
2301
2302 // This presupposed that instructions are inserted into the
2303 // available list in a legality order; i.e. instructions that
2304 // must be inserted first are at the head of the list
2305 if (NodeFitsInBundle(n)) {
2306 #ifndef PRODUCT
2307 if (_cfg->C->trace_opto_output()) {
2308 tty->print("# ChooseNodeToBundle: ");
2309 n->dump();
2310 }
2311 #endif
2312 return (n);
2313 }
2314 }
2315 }
2316
2317 // Nothing fits in this bundle, choose the highest priority
2318 #ifndef PRODUCT
2319 if (_cfg->C->trace_opto_output()) {
2320 tty->print("# ChooseNodeToBundle: ");
2321 _available[0]->dump();
2322 }
2323 #endif
2324
2325 return _available[0];
2326 }
2327
2328 int Scheduling::compare_two_spill_nodes(Node* first, Node* second) {
2329 assert(first->is_MachSpillCopy() && second->is_MachSpillCopy(), "");
2330
2331 OptoReg::Name first_src_lo = _regalloc->get_reg_first(first->in(1));
2332 OptoReg::Name first_dst_lo = _regalloc->get_reg_first(first);
2333 OptoReg::Name second_src_lo = _regalloc->get_reg_first(second->in(1));
2334 OptoReg::Name second_dst_lo = _regalloc->get_reg_first(second);
2335
2336 // Comparison between stack -> reg and stack -> reg
2337 if (OptoReg::is_stack(first_src_lo) && OptoReg::is_stack(second_src_lo) &&
2338 OptoReg::is_reg(first_dst_lo) && OptoReg::is_reg(second_dst_lo)) {
2339 return _regalloc->reg2offset(first_src_lo) - _regalloc->reg2offset(second_src_lo);
2340 }
2341
2342 // Comparison between reg -> stack and reg -> stack
2343 if (OptoReg::is_stack(first_dst_lo) && OptoReg::is_stack(second_dst_lo) &&
2344 OptoReg::is_reg(first_src_lo) && OptoReg::is_reg(second_src_lo)) {
2345 return _regalloc->reg2offset(first_dst_lo) - _regalloc->reg2offset(second_dst_lo);
2346 }
2347
2348 return 0; // Not comparable
2349 }
2350
2351 void Scheduling::AddNodeToAvailableList(Node *n) {
2352 assert( !n->is_Proj(), "projections never directly made available" );
2353 #ifndef PRODUCT
2354 if (_cfg->C->trace_opto_output()) {
2355 tty->print("# AddNodeToAvailableList: ");
2356 n->dump();
2357 }
2358 #endif
2359
2360 int latency = _current_latency[n->_idx];
2361
2362 // Insert in latency order (insertion sort). If two MachSpillCopyNodes
2363 // for stack spilling or unspilling have the same latency, we sort
2364 // them in the order of stack offset. Some ports (e.g. aarch64) may also
2365 // have more opportunities to do ld/st merging
2366 uint i;
2367 for (i = 0; i < _available.size(); i++) {
2368 if (_current_latency[_available[i]->_idx] > latency) {
2369 break;
2370 } else if (_current_latency[_available[i]->_idx] == latency &&
2371 n->is_MachSpillCopy() && _available[i]->is_MachSpillCopy() &&
2372 compare_two_spill_nodes(n, _available[i]) > 0) {
2373 break;
2374 }
2375 }
2376
2377 // Special Check for compares following branches
2378 if( n->is_Mach() && _scheduled.size() > 0 ) {
2379 int op = n->as_Mach()->ideal_Opcode();
2380 Node *last = _scheduled[0];
2381 if( last->is_MachIf() && last->in(1) == n &&
2382 ( op == Op_CmpI ||
2383 op == Op_CmpU ||
2384 op == Op_CmpUL ||
2385 op == Op_CmpP ||
2386 op == Op_CmpF ||
2387 op == Op_CmpD ||
2388 op == Op_CmpL ) ) {
2389
2390 // Recalculate position, moving to front of same latency
2391 for ( i=0 ; i < _available.size(); i++ )
2392 if (_current_latency[_available[i]->_idx] >= latency)
2393 break;
2394 }
2395 }
2396
2397 // Insert the node in the available list
2398 _available.insert(i, n);
2399
2400 #ifndef PRODUCT
2401 if (_cfg->C->trace_opto_output())
2402 dump_available();
2403 #endif
2404 }
2405
2406 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) {
2407 for ( uint i=0; i < n->len(); i++ ) {
2408 Node *def = n->in(i);
2409 if (!def) continue;
2410 if( def->is_Proj() ) // If this is a machine projection, then
2411 def = def->in(0); // propagate usage thru to the base instruction
2412
2413 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local
2414 continue;
2415 }
2416
2417 // Compute the latency
2418 uint l = _bundle_cycle_number + n->latency(i);
2419 if (_current_latency[def->_idx] < l)
2420 _current_latency[def->_idx] = l;
2421
2422 // If this does not have uses then schedule it
2423 if ((--_uses[def->_idx]) == 0)
2424 AddNodeToAvailableList(def);
2425 }
2426 }
2427
2428 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) {
2429 #ifndef PRODUCT
2430 if (_cfg->C->trace_opto_output()) {
2431 tty->print("# AddNodeToBundle: ");
2432 n->dump();
2433 }
2434 #endif
2435
2436 // Remove this from the available list
2437 uint i;
2438 for (i = 0; i < _available.size(); i++)
2439 if (_available[i] == n)
2440 break;
2441 assert(i < _available.size(), "entry in _available list not found");
2442 _available.remove(i);
2443
2444 // See if this fits in the current bundle
2445 const Pipeline *node_pipeline = n->pipeline();
2446 const Pipeline_Use& node_usage = node_pipeline->resourceUse();
2447
2448 // Check for instructions to be placed in the delay slot. We
2449 // do this before we actually schedule the current instruction,
2450 // because the delay slot follows the current instruction.
2451 if (Pipeline::_branch_has_delay_slot &&
2452 node_pipeline->hasBranchDelay() &&
2453 !_unconditional_delay_slot) {
2454
2455 uint siz = _available.size();
2456
2457 // Conditional branches can support an instruction that
2458 // is unconditionally executed and not dependent by the
2459 // branch, OR a conditionally executed instruction if
2460 // the branch is taken. In practice, this means that
2461 // the first instruction at the branch target is
2462 // copied to the delay slot, and the branch goes to
2463 // the instruction after that at the branch target
2464 if ( n->is_MachBranch() ) {
2465
2466 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" );
2467 assert( !n->is_Catch(), "should not look for delay slot for Catch" );
2468
2469 #ifndef PRODUCT
2470 _branches++;
2471 #endif
2472
2473 // At least 1 instruction is on the available list
2474 // that is not dependent on the branch
2475 for (uint i = 0; i < siz; i++) {
2476 Node *d = _available[i];
2477 const Pipeline *avail_pipeline = d->pipeline();
2478
2479 // Don't allow safepoints in the branch shadow, that will
2480 // cause a number of difficulties
2481 if ( avail_pipeline->instructionCount() == 1 &&
2482 !avail_pipeline->hasMultipleBundles() &&
2483 !avail_pipeline->hasBranchDelay() &&
2484 Pipeline::instr_has_unit_size() &&
2485 d->size(_regalloc) == Pipeline::instr_unit_size() &&
2486 NodeFitsInBundle(d) &&
2487 !node_bundling(d)->used_in_delay()) {
2488
2489 if (d->is_Mach() && !d->is_MachSafePoint()) {
2490 // A node that fits in the delay slot was found, so we need to
2491 // set the appropriate bits in the bundle pipeline information so
2492 // that it correctly indicates resource usage. Later, when we
2493 // attempt to add this instruction to the bundle, we will skip
2494 // setting the resource usage.
2495 _unconditional_delay_slot = d;
2496 node_bundling(n)->set_use_unconditional_delay();
2497 node_bundling(d)->set_used_in_unconditional_delay();
2498 _bundle_use.add_usage(avail_pipeline->resourceUse());
2499 _current_latency[d->_idx] = _bundle_cycle_number;
2500 _next_node = d;
2501 ++_bundle_instr_count;
2502 #ifndef PRODUCT
2503 _unconditional_delays++;
2504 #endif
2505 break;
2506 }
2507 }
2508 }
2509 }
2510
2511 // No delay slot, add a nop to the usage
2512 if (!_unconditional_delay_slot) {
2513 // See if adding an instruction in the delay slot will overflow
2514 // the bundle.
2515 if (!NodeFitsInBundle(_nop)) {
2516 #ifndef PRODUCT
2517 if (_cfg->C->trace_opto_output())
2518 tty->print("# *** STEP(1 instruction for delay slot) ***\n");
2519 #endif
2520 step(1);
2521 }
2522
2523 _bundle_use.add_usage(_nop->pipeline()->resourceUse());
2524 _next_node = _nop;
2525 ++_bundle_instr_count;
2526 }
2527
2528 // See if the instruction in the delay slot requires a
2529 // step of the bundles
2530 if (!NodeFitsInBundle(n)) {
2531 #ifndef PRODUCT
2532 if (_cfg->C->trace_opto_output())
2533 tty->print("# *** STEP(branch won't fit) ***\n");
2534 #endif
2535 // Update the state information
2536 _bundle_instr_count = 0;
2537 _bundle_cycle_number += 1;
2538 _bundle_use.step(1);
2539 }
2540 }
2541
2542 // Get the number of instructions
2543 uint instruction_count = node_pipeline->instructionCount();
2544 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2545 instruction_count = 0;
2546
2547 // Compute the latency information
2548 uint delay = 0;
2549
2550 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) {
2551 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number;
2552 if (relative_latency < 0)
2553 relative_latency = 0;
2554
2555 delay = _bundle_use.full_latency(relative_latency, node_usage);
2556
2557 // Does not fit in this bundle, start a new one
2558 if (delay > 0) {
2559 step(delay);
2560
2561 #ifndef PRODUCT
2562 if (_cfg->C->trace_opto_output())
2563 tty->print("# *** STEP(%d) ***\n", delay);
2564 #endif
2565 }
2566 }
2567
2568 // If this was placed in the delay slot, ignore it
2569 if (n != _unconditional_delay_slot) {
2570
2571 if (delay == 0) {
2572 if (node_pipeline->hasMultipleBundles()) {
2573 #ifndef PRODUCT
2574 if (_cfg->C->trace_opto_output())
2575 tty->print("# *** STEP(multiple instructions) ***\n");
2576 #endif
2577 step(1);
2578 }
2579
2580 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) {
2581 #ifndef PRODUCT
2582 if (_cfg->C->trace_opto_output())
2583 tty->print("# *** STEP(%d >= %d instructions) ***\n",
2584 instruction_count + _bundle_instr_count,
2585 Pipeline::_max_instrs_per_cycle);
2586 #endif
2587 step(1);
2588 }
2589 }
2590
2591 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2592 _bundle_instr_count++;
2593
2594 // Set the node's latency
2595 _current_latency[n->_idx] = _bundle_cycle_number;
2596
2597 // Now merge the functional unit information
2598 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode())
2599 _bundle_use.add_usage(node_usage);
2600
2601 // Increment the number of instructions in this bundle
2602 _bundle_instr_count += instruction_count;
2603
2604 // Remember this node for later
2605 if (n->is_Mach())
2606 _next_node = n;
2607 }
2608
2609 // It's possible to have a BoxLock in the graph and in the _bbs mapping but
2610 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks.
2611 // 'Schedule' them (basically ignore in the schedule) but do not insert them
2612 // into the block. All other scheduled nodes get put in the schedule here.
2613 int op = n->Opcode();
2614 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR
2615 (op != Op_Node && // Not an unused antidepedence node and
2616 // not an unallocated boxlock
2617 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) {
2618
2619 // Push any trailing projections
2620 if( bb->get_node(bb->number_of_nodes()-1) != n ) {
2621 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
2622 Node *foi = n->fast_out(i);
2623 if( foi->is_Proj() )
2624 _scheduled.push(foi);
2625 }
2626 }
2627
2628 // Put the instruction in the schedule list
2629 _scheduled.push(n);
2630 }
2631
2632 #ifndef PRODUCT
2633 if (_cfg->C->trace_opto_output())
2634 dump_available();
2635 #endif
2636
2637 // Walk all the definitions, decrementing use counts, and
2638 // if a definition has a 0 use count, place it in the available list.
2639 DecrementUseCounts(n,bb);
2640 }
2641
2642 // This method sets the use count within a basic block. We will ignore all
2643 // uses outside the current basic block. As we are doing a backwards walk,
2644 // any node we reach that has a use count of 0 may be scheduled. This also
2645 // avoids the problem of cyclic references from phi nodes, as long as phi
2646 // nodes are at the front of the basic block. This method also initializes
2647 // the available list to the set of instructions that have no uses within this
2648 // basic block.
2649 void Scheduling::ComputeUseCount(const Block *bb) {
2650 #ifndef PRODUCT
2651 if (_cfg->C->trace_opto_output())
2652 tty->print("# -> ComputeUseCount\n");
2653 #endif
2654
2655 // Clear the list of available and scheduled instructions, just in case
2656 _available.clear();
2657 _scheduled.clear();
2658
2659 // No delay slot specified
2660 _unconditional_delay_slot = nullptr;
2661
2662 #ifdef ASSERT
2663 for( uint i=0; i < bb->number_of_nodes(); i++ )
2664 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" );
2665 #endif
2666
2667 // Force the _uses count to never go to zero for unscheduable pieces
2668 // of the block
2669 for( uint k = 0; k < _bb_start; k++ )
2670 _uses[bb->get_node(k)->_idx] = 1;
2671 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ )
2672 _uses[bb->get_node(l)->_idx] = 1;
2673
2674 // Iterate backwards over the instructions in the block. Don't count the
2675 // branch projections at end or the block header instructions.
2676 for( uint j = _bb_end-1; j >= _bb_start; j-- ) {
2677 Node *n = bb->get_node(j);
2678 if( n->is_Proj() ) continue; // Projections handled another way
2679
2680 // Account for all uses
2681 for ( uint k = 0; k < n->len(); k++ ) {
2682 Node *inp = n->in(k);
2683 if (!inp) continue;
2684 assert(inp != n, "no cycles allowed" );
2685 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use?
2686 if (inp->is_Proj()) { // Skip through Proj's
2687 inp = inp->in(0);
2688 }
2689 ++_uses[inp->_idx]; // Count 1 block-local use
2690 }
2691 }
2692
2693 // If this instruction has a 0 use count, then it is available
2694 if (!_uses[n->_idx]) {
2695 _current_latency[n->_idx] = _bundle_cycle_number;
2696 AddNodeToAvailableList(n);
2697 }
2698
2699 #ifndef PRODUCT
2700 if (_cfg->C->trace_opto_output()) {
2701 tty->print("# uses: %3d: ", _uses[n->_idx]);
2702 n->dump();
2703 }
2704 #endif
2705 }
2706
2707 #ifndef PRODUCT
2708 if (_cfg->C->trace_opto_output())
2709 tty->print("# <- ComputeUseCount\n");
2710 #endif
2711 }
2712
2713 // This routine performs scheduling on each basic block in reverse order,
2714 // using instruction latencies and taking into account function unit
2715 // availability.
2716 void Scheduling::DoScheduling() {
2717 #ifndef PRODUCT
2718 if (_cfg->C->trace_opto_output())
2719 tty->print("# -> DoScheduling\n");
2720 #endif
2721
2722 Block *succ_bb = nullptr;
2723 Block *bb;
2724 Compile* C = Compile::current();
2725
2726 // Walk over all the basic blocks in reverse order
2727 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) {
2728 bb = _cfg->get_block(i);
2729
2730 #ifndef PRODUCT
2731 if (_cfg->C->trace_opto_output()) {
2732 tty->print("# Schedule BB#%03d (initial)\n", i);
2733 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2734 bb->get_node(j)->dump();
2735 }
2736 }
2737 #endif
2738
2739 // On the head node, skip processing
2740 if (bb == _cfg->get_root_block()) {
2741 continue;
2742 }
2743
2744 // Skip empty, connector blocks
2745 if (bb->is_connector())
2746 continue;
2747
2748 // If the following block is not the sole successor of
2749 // this one, then reset the pipeline information
2750 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) {
2751 #ifndef PRODUCT
2752 if (_cfg->C->trace_opto_output()) {
2753 tty->print("*** bundle start of next BB, node %d, for %d instructions\n",
2754 _next_node->_idx, _bundle_instr_count);
2755 }
2756 #endif
2757 step_and_clear();
2758 }
2759
2760 // Leave untouched the starting instruction, any Phis, a CreateEx node
2761 // or Top. bb->get_node(_bb_start) is the first schedulable instruction.
2762 _bb_end = bb->number_of_nodes()-1;
2763 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) {
2764 Node *n = bb->get_node(_bb_start);
2765 // Things not matched, like Phinodes and ProjNodes don't get scheduled.
2766 // Also, MachIdealNodes do not get scheduled
2767 if( !n->is_Mach() ) continue; // Skip non-machine nodes
2768 MachNode *mach = n->as_Mach();
2769 int iop = mach->ideal_Opcode();
2770 if( iop == Op_CreateEx ) continue; // CreateEx is pinned
2771 if( iop == Op_Con ) continue; // Do not schedule Top
2772 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes
2773 mach->pipeline() == MachNode::pipeline_class() &&
2774 !n->is_SpillCopy() && !n->is_MachMerge() ) // Breakpoints, Prolog, etc
2775 continue;
2776 break; // Funny loop structure to be sure...
2777 }
2778 // Compute last "interesting" instruction in block - last instruction we
2779 // might schedule. _bb_end points just after last schedulable inst. We
2780 // normally schedule conditional branches (despite them being forced last
2781 // in the block), because they have delay slots we can fill. Calls all
2782 // have their delay slots filled in the template expansions, so we don't
2783 // bother scheduling them.
2784 Node *last = bb->get_node(_bb_end);
2785 // Ignore trailing NOPs.
2786 while (_bb_end > 0 && last->is_Mach() &&
2787 last->as_Mach()->ideal_Opcode() == Op_Con) {
2788 last = bb->get_node(--_bb_end);
2789 }
2790 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, "");
2791 if( last->is_Catch() ||
2792 (last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) {
2793 // There might be a prior call. Skip it.
2794 while (_bb_start < _bb_end && bb->get_node(--_bb_end)->is_MachProj());
2795 } else if( last->is_MachNullCheck() ) {
2796 // Backup so the last null-checked memory instruction is
2797 // outside the schedulable range. Skip over the nullcheck,
2798 // projection, and the memory nodes.
2799 Node *mem = last->in(1);
2800 do {
2801 _bb_end--;
2802 } while (mem != bb->get_node(_bb_end));
2803 } else {
2804 // Set _bb_end to point after last schedulable inst.
2805 _bb_end++;
2806 }
2807
2808 assert( _bb_start <= _bb_end, "inverted block ends" );
2809
2810 // Compute the register antidependencies for the basic block
2811 ComputeRegisterAntidependencies(bb);
2812 if (C->failing()) return; // too many D-U pinch points
2813
2814 // Compute the usage within the block, and set the list of all nodes
2815 // in the block that have no uses within the block.
2816 ComputeUseCount(bb);
2817
2818 // Schedule the remaining instructions in the block
2819 while ( _available.size() > 0 ) {
2820 Node *n = ChooseNodeToBundle();
2821 guarantee(n != nullptr, "no nodes available");
2822 AddNodeToBundle(n,bb);
2823 }
2824
2825 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" );
2826 #ifdef ASSERT
2827 for( uint l = _bb_start; l < _bb_end; l++ ) {
2828 Node *n = bb->get_node(l);
2829 uint m;
2830 for( m = 0; m < _bb_end-_bb_start; m++ )
2831 if( _scheduled[m] == n )
2832 break;
2833 assert( m < _bb_end-_bb_start, "instruction missing in schedule" );
2834 }
2835 #endif
2836
2837 // Now copy the instructions (in reverse order) back to the block
2838 for ( uint k = _bb_start; k < _bb_end; k++ )
2839 bb->map_node(_scheduled[_bb_end-k-1], k);
2840
2841 #ifndef PRODUCT
2842 if (_cfg->C->trace_opto_output()) {
2843 tty->print("# Schedule BB#%03d (final)\n", i);
2844 uint current = 0;
2845 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2846 Node *n = bb->get_node(j);
2847 if( valid_bundle_info(n) ) {
2848 Bundle *bundle = node_bundling(n);
2849 if (bundle->instr_count() > 0 || bundle->flags() > 0) {
2850 tty->print("*** Bundle: ");
2851 bundle->dump();
2852 }
2853 n->dump();
2854 }
2855 }
2856 }
2857 #endif
2858 #ifdef ASSERT
2859 verify_good_schedule(bb,"after block local scheduling");
2860 #endif
2861 }
2862
2863 #ifndef PRODUCT
2864 if (_cfg->C->trace_opto_output())
2865 tty->print("# <- DoScheduling\n");
2866 #endif
2867
2868 // Record final node-bundling array location
2869 _regalloc->C->output()->set_node_bundling_base(_node_bundling_base);
2870
2871 } // end DoScheduling
2872
2873 // Verify that no live-range used in the block is killed in the block by a
2874 // wrong DEF. This doesn't verify live-ranges that span blocks.
2875
2876 // Check for edge existence. Used to avoid adding redundant precedence edges.
2877 static bool edge_from_to( Node *from, Node *to ) {
2878 for( uint i=0; i<from->len(); i++ )
2879 if( from->in(i) == to )
2880 return true;
2881 return false;
2882 }
2883
2884 #ifdef ASSERT
2885 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) {
2886 // Check for bad kills
2887 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow
2888 Node *prior_use = _reg_node[def];
2889 if( prior_use && !edge_from_to(prior_use,n) ) {
2890 tty->print("%s = ",OptoReg::as_VMReg(def)->name());
2891 n->dump();
2892 tty->print_cr("...");
2893 prior_use->dump();
2894 assert(edge_from_to(prior_use,n), "%s", msg);
2895 }
2896 _reg_node.map(def,nullptr); // Kill live USEs
2897 }
2898 }
2899
2900 void Scheduling::verify_good_schedule( Block *b, const char *msg ) {
2901
2902 // Zap to something reasonable for the verify code
2903 _reg_node.clear();
2904
2905 // Walk over the block backwards. Check to make sure each DEF doesn't
2906 // kill a live value (other than the one it's supposed to). Add each
2907 // USE to the live set.
2908 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) {
2909 Node *n = b->get_node(i);
2910 int n_op = n->Opcode();
2911 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) {
2912 // Fat-proj kills a slew of registers
2913 RegMaskIterator rmi(n->out_RegMask());
2914 while (rmi.has_next()) {
2915 OptoReg::Name kill = rmi.next();
2916 verify_do_def(n, kill, msg);
2917 }
2918 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes
2919 // Get DEF'd registers the normal way
2920 verify_do_def( n, _regalloc->get_reg_first(n), msg );
2921 verify_do_def( n, _regalloc->get_reg_second(n), msg );
2922 }
2923
2924 // Now make all USEs live
2925 for( uint i=1; i<n->req(); i++ ) {
2926 Node *def = n->in(i);
2927 assert(def != nullptr, "input edge required");
2928 OptoReg::Name reg_lo = _regalloc->get_reg_first(def);
2929 OptoReg::Name reg_hi = _regalloc->get_reg_second(def);
2930 if( OptoReg::is_valid(reg_lo) ) {
2931 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), "%s", msg);
2932 _reg_node.map(reg_lo,n);
2933 }
2934 if( OptoReg::is_valid(reg_hi) ) {
2935 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), "%s", msg);
2936 _reg_node.map(reg_hi,n);
2937 }
2938 }
2939
2940 }
2941
2942 // Zap to something reasonable for the Antidependence code
2943 _reg_node.clear();
2944 }
2945 #endif
2946
2947 // Conditionally add precedence edges. Avoid putting edges on Projs.
2948 static void add_prec_edge_from_to( Node *from, Node *to ) {
2949 if( from->is_Proj() ) { // Put precedence edge on Proj's input
2950 assert( from->req() == 1 && (from->len() == 1 || from->in(1) == nullptr), "no precedence edges on projections" );
2951 from = from->in(0);
2952 }
2953 if( from != to && // No cycles (for things like LD L0,[L0+4] )
2954 !edge_from_to( from, to ) ) // Avoid duplicate edge
2955 from->add_prec(to);
2956 }
2957
2958 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) {
2959 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow
2960 return;
2961
2962 if (OptoReg::is_reg(def_reg)) {
2963 VMReg vmreg = OptoReg::as_VMReg(def_reg);
2964 if (vmreg->is_reg() && !vmreg->is_concrete() && !vmreg->prev()->is_concrete()) {
2965 // This is one of the high slots of a vector register.
2966 // ScheduleAndBundle already checked there are no live wide
2967 // vectors in this method so it can be safely ignored.
2968 return;
2969 }
2970 }
2971
2972 Node *pinch = _reg_node[def_reg]; // Get pinch point
2973 if ((pinch == nullptr) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet?
2974 is_def ) { // Check for a true def (not a kill)
2975 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point
2976 return;
2977 }
2978
2979 Node *kill = def; // Rename 'def' to more descriptive 'kill'
2980 debug_only( def = (Node*)((intptr_t)0xdeadbeef); )
2981
2982 // After some number of kills there _may_ be a later def
2983 Node *later_def = nullptr;
2984
2985 Compile* C = Compile::current();
2986
2987 // Finding a kill requires a real pinch-point.
2988 // Check for not already having a pinch-point.
2989 // Pinch points are Op_Node's.
2990 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point?
2991 later_def = pinch; // Must be def/kill as optimistic pinch-point
2992 if ( _pinch_free_list.size() > 0) {
2993 pinch = _pinch_free_list.pop();
2994 } else {
2995 pinch = new Node(1); // Pinch point to-be
2996 }
2997 if (pinch->_idx >= _regalloc->node_regs_max_index()) {
2998 DEBUG_ONLY( pinch->dump(); );
2999 assert(false, "too many D-U pinch points: %d >= %d", pinch->_idx, _regalloc->node_regs_max_index());
3000 _cfg->C->record_method_not_compilable("too many D-U pinch points");
3001 return;
3002 }
3003 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init)
3004 _reg_node.map(def_reg,pinch); // Record pinch-point
3005 //regalloc()->set_bad(pinch->_idx); // Already initialized this way.
3006 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill
3007 pinch->init_req(0, C->top()); // set not null for the next call
3008 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch
3009 later_def = nullptr; // and no later def
3010 }
3011 pinch->set_req(0,later_def); // Hook later def so we can find it
3012 } else { // Else have valid pinch point
3013 if( pinch->in(0) ) // If there is a later-def
3014 later_def = pinch->in(0); // Get it
3015 }
3016
3017 // Add output-dependence edge from later def to kill
3018 if( later_def ) // If there is some original def
3019 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill
3020
3021 // See if current kill is also a use, and so is forced to be the pinch-point.
3022 if( pinch->Opcode() == Op_Node ) {
3023 Node *uses = kill->is_Proj() ? kill->in(0) : kill;
3024 for( uint i=1; i<uses->req(); i++ ) {
3025 if( _regalloc->get_reg_first(uses->in(i)) == def_reg ||
3026 _regalloc->get_reg_second(uses->in(i)) == def_reg ) {
3027 // Yes, found a use/kill pinch-point
3028 pinch->set_req(0,nullptr); //
3029 pinch->replace_by(kill); // Move anti-dep edges up
3030 pinch = kill;
3031 _reg_node.map(def_reg,pinch);
3032 return;
3033 }
3034 }
3035 }
3036
3037 // Add edge from kill to pinch-point
3038 add_prec_edge_from_to(kill,pinch);
3039 }
3040
3041 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) {
3042 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow
3043 return;
3044 Node *pinch = _reg_node[use_reg]; // Get pinch point
3045 // Check for no later def_reg/kill in block
3046 if ((pinch != nullptr) && _cfg->get_block_for_node(pinch) == b &&
3047 // Use has to be block-local as well
3048 _cfg->get_block_for_node(use) == b) {
3049 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?)
3050 pinch->req() == 1 ) { // pinch not yet in block?
3051 pinch->del_req(0); // yank pointer to later-def, also set flag
3052 // Insert the pinch-point in the block just after the last use
3053 b->insert_node(pinch, b->find_node(use) + 1);
3054 _bb_end++; // Increase size scheduled region in block
3055 }
3056
3057 add_prec_edge_from_to(pinch,use);
3058 }
3059 }
3060
3061 // We insert antidependences between the reads and following write of
3062 // allocated registers to prevent illegal code motion. Hopefully, the
3063 // number of added references should be fairly small, especially as we
3064 // are only adding references within the current basic block.
3065 void Scheduling::ComputeRegisterAntidependencies(Block *b) {
3066
3067 #ifdef ASSERT
3068 verify_good_schedule(b,"before block local scheduling");
3069 #endif
3070
3071 // A valid schedule, for each register independently, is an endless cycle
3072 // of: a def, then some uses (connected to the def by true dependencies),
3073 // then some kills (defs with no uses), finally the cycle repeats with a new
3074 // def. The uses are allowed to float relative to each other, as are the
3075 // kills. No use is allowed to slide past a kill (or def). This requires
3076 // antidependencies between all uses of a single def and all kills that
3077 // follow, up to the next def. More edges are redundant, because later defs
3078 // & kills are already serialized with true or antidependencies. To keep
3079 // the edge count down, we add a 'pinch point' node if there's more than
3080 // one use or more than one kill/def.
3081
3082 // We add dependencies in one bottom-up pass.
3083
3084 // For each instruction we handle it's DEFs/KILLs, then it's USEs.
3085
3086 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this
3087 // register. If not, we record the DEF/KILL in _reg_node, the
3088 // register-to-def mapping. If there is a prior DEF/KILL, we insert a
3089 // "pinch point", a new Node that's in the graph but not in the block.
3090 // We put edges from the prior and current DEF/KILLs to the pinch point.
3091 // We put the pinch point in _reg_node. If there's already a pinch point
3092 // we merely add an edge from the current DEF/KILL to the pinch point.
3093
3094 // After doing the DEF/KILLs, we handle USEs. For each used register, we
3095 // put an edge from the pinch point to the USE.
3096
3097 // To be expedient, the _reg_node array is pre-allocated for the whole
3098 // compilation. _reg_node is lazily initialized; it either contains a null,
3099 // or a valid def/kill/pinch-point, or a leftover node from some prior
3100 // block. Leftover node from some prior block is treated like a null (no
3101 // prior def, so no anti-dependence needed). Valid def is distinguished by
3102 // it being in the current block.
3103 bool fat_proj_seen = false;
3104 uint last_safept = _bb_end-1;
3105 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : nullptr;
3106 Node* last_safept_node = end_node;
3107 for( uint i = _bb_end-1; i >= _bb_start; i-- ) {
3108 Node *n = b->get_node(i);
3109 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges
3110 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) {
3111 // Fat-proj kills a slew of registers
3112 // This can add edges to 'n' and obscure whether or not it was a def,
3113 // hence the is_def flag.
3114 fat_proj_seen = true;
3115 RegMaskIterator rmi(n->out_RegMask());
3116 while (rmi.has_next()) {
3117 OptoReg::Name kill = rmi.next();
3118 anti_do_def(b, n, kill, is_def);
3119 }
3120 } else {
3121 // Get DEF'd registers the normal way
3122 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def );
3123 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def );
3124 }
3125
3126 // Kill projections on a branch should appear to occur on the
3127 // branch, not afterwards, so grab the masks from the projections
3128 // and process them.
3129 if (n->is_MachBranch() || (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump)) {
3130 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3131 Node* use = n->fast_out(i);
3132 if (use->is_Proj()) {
3133 RegMaskIterator rmi(use->out_RegMask());
3134 while (rmi.has_next()) {
3135 OptoReg::Name kill = rmi.next();
3136 anti_do_def(b, n, kill, false);
3137 }
3138 }
3139 }
3140 }
3141
3142 // Check each register used by this instruction for a following DEF/KILL
3143 // that must occur afterward and requires an anti-dependence edge.
3144 for( uint j=0; j<n->req(); j++ ) {
3145 Node *def = n->in(j);
3146 if( def ) {
3147 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" );
3148 anti_do_use( b, n, _regalloc->get_reg_first(def) );
3149 anti_do_use( b, n, _regalloc->get_reg_second(def) );
3150 }
3151 }
3152 // Do not allow defs of new derived values to float above GC
3153 // points unless the base is definitely available at the GC point.
3154
3155 Node *m = b->get_node(i);
3156
3157 // Add precedence edge from following safepoint to use of derived pointer
3158 if( last_safept_node != end_node &&
3159 m != last_safept_node) {
3160 for (uint k = 1; k < m->req(); k++) {
3161 const Type *t = m->in(k)->bottom_type();
3162 if( t->isa_oop_ptr() &&
3163 t->is_ptr()->offset() != 0 ) {
3164 last_safept_node->add_prec( m );
3165 break;
3166 }
3167 }
3168 }
3169
3170 if( n->jvms() ) { // Precedence edge from derived to safept
3171 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
3172 if( b->get_node(last_safept) != last_safept_node ) {
3173 last_safept = b->find_node(last_safept_node);
3174 }
3175 for( uint j=last_safept; j > i; j-- ) {
3176 Node *mach = b->get_node(j);
3177 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
3178 mach->add_prec( n );
3179 }
3180 last_safept = i;
3181 last_safept_node = m;
3182 }
3183 }
3184
3185 if (fat_proj_seen) {
3186 // Garbage collect pinch nodes that were not consumed.
3187 // They are usually created by a fat kill MachProj for a call.
3188 garbage_collect_pinch_nodes();
3189 }
3190 }
3191
3192 // Garbage collect pinch nodes for reuse by other blocks.
3193 //
3194 // The block scheduler's insertion of anti-dependence
3195 // edges creates many pinch nodes when the block contains
3196 // 2 or more Calls. A pinch node is used to prevent a
3197 // combinatorial explosion of edges. If a set of kills for a
3198 // register is anti-dependent on a set of uses (or defs), rather
3199 // than adding an edge in the graph between each pair of kill
3200 // and use (or def), a pinch is inserted between them:
3201 //
3202 // use1 use2 use3
3203 // \ | /
3204 // \ | /
3205 // pinch
3206 // / | \
3207 // / | \
3208 // kill1 kill2 kill3
3209 //
3210 // One pinch node is created per register killed when
3211 // the second call is encountered during a backwards pass
3212 // over the block. Most of these pinch nodes are never
3213 // wired into the graph because the register is never
3214 // used or def'ed in the block.
3215 //
3216 void Scheduling::garbage_collect_pinch_nodes() {
3217 #ifndef PRODUCT
3218 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:");
3219 #endif
3220 int trace_cnt = 0;
3221 for (uint k = 0; k < _reg_node.max(); k++) {
3222 Node* pinch = _reg_node[k];
3223 if ((pinch != nullptr) && pinch->Opcode() == Op_Node &&
3224 // no predecence input edges
3225 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == nullptr) ) {
3226 cleanup_pinch(pinch);
3227 _pinch_free_list.push(pinch);
3228 _reg_node.map(k, nullptr);
3229 #ifndef PRODUCT
3230 if (_cfg->C->trace_opto_output()) {
3231 trace_cnt++;
3232 if (trace_cnt > 40) {
3233 tty->print("\n");
3234 trace_cnt = 0;
3235 }
3236 tty->print(" %d", pinch->_idx);
3237 }
3238 #endif
3239 }
3240 }
3241 #ifndef PRODUCT
3242 if (_cfg->C->trace_opto_output()) tty->print("\n");
3243 #endif
3244 }
3245
3246 // Clean up a pinch node for reuse.
3247 void Scheduling::cleanup_pinch( Node *pinch ) {
3248 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking");
3249
3250 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) {
3251 Node* use = pinch->last_out(i);
3252 uint uses_found = 0;
3253 for (uint j = use->req(); j < use->len(); j++) {
3254 if (use->in(j) == pinch) {
3255 use->rm_prec(j);
3256 uses_found++;
3257 }
3258 }
3259 assert(uses_found > 0, "must be a precedence edge");
3260 i -= uses_found; // we deleted 1 or more copies of this edge
3261 }
3262 // May have a later_def entry
3263 pinch->set_req(0, nullptr);
3264 }
3265
3266 #ifndef PRODUCT
3267
3268 void Scheduling::dump_available() const {
3269 tty->print("#Availist ");
3270 for (uint i = 0; i < _available.size(); i++)
3271 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]);
3272 tty->cr();
3273 }
3274
3275 // Print Scheduling Statistics
3276 void Scheduling::print_statistics() {
3277 // Print the size added by nops for bundling
3278 tty->print("Nops added %d bytes to total of %d bytes",
3279 _total_nop_size, _total_method_size);
3280 if (_total_method_size > 0)
3281 tty->print(", for %.2f%%",
3282 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0);
3283 tty->print("\n");
3284
3285 // Print the number of branch shadows filled
3286 if (Pipeline::_branch_has_delay_slot) {
3287 tty->print("Of %d branches, %d had unconditional delay slots filled",
3288 _total_branches, _total_unconditional_delays);
3289 if (_total_branches > 0)
3290 tty->print(", for %.2f%%",
3291 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0);
3292 tty->print("\n");
3293 }
3294
3295 uint total_instructions = 0, total_bundles = 0;
3296
3297 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) {
3298 uint bundle_count = _total_instructions_per_bundle[i];
3299 total_instructions += bundle_count * i;
3300 total_bundles += bundle_count;
3301 }
3302
3303 if (total_bundles > 0)
3304 tty->print("Average ILP (excluding nops) is %.2f\n",
3305 ((double)total_instructions) / ((double)total_bundles));
3306 }
3307 #endif
3308
3309 //-----------------------init_scratch_buffer_blob------------------------------
3310 // Construct a temporary BufferBlob and cache it for this compile.
3311 void PhaseOutput::init_scratch_buffer_blob(int const_size) {
3312 // If there is already a scratch buffer blob allocated and the
3313 // constant section is big enough, use it. Otherwise free the
3314 // current and allocate a new one.
3315 BufferBlob* blob = scratch_buffer_blob();
3316 if ((blob != nullptr) && (const_size <= _scratch_const_size)) {
3317 // Use the current blob.
3318 } else {
3319 if (blob != nullptr) {
3320 BufferBlob::free(blob);
3321 }
3322
3323 ResourceMark rm;
3324 _scratch_const_size = const_size;
3325 int size = C2Compiler::initial_code_buffer_size(const_size);
3326 blob = BufferBlob::create("Compile::scratch_buffer", size);
3327 // Record the buffer blob for next time.
3328 set_scratch_buffer_blob(blob);
3329 // Have we run out of code space?
3330 if (scratch_buffer_blob() == nullptr) {
3331 // Let CompilerBroker disable further compilations.
3332 C->record_failure("Not enough space for scratch buffer in CodeCache");
3333 return;
3334 }
3335 }
3336
3337 // Initialize the relocation buffers
3338 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
3339 set_scratch_locs_memory(locs_buf);
3340 }
3341
3342
3343 //-----------------------scratch_emit_size-------------------------------------
3344 // Helper function that computes size by emitting code
3345 uint PhaseOutput::scratch_emit_size(const Node* n) {
3346 // Start scratch_emit_size section.
3347 set_in_scratch_emit_size(true);
3348
3349 // Emit into a trash buffer and count bytes emitted.
3350 // This is a pretty expensive way to compute a size,
3351 // but it works well enough if seldom used.
3352 // All common fixed-size instructions are given a size
3353 // method by the AD file.
3354 // Note that the scratch buffer blob and locs memory are
3355 // allocated at the beginning of the compile task, and
3356 // may be shared by several calls to scratch_emit_size.
3357 // The allocation of the scratch buffer blob is particularly
3358 // expensive, since it has to grab the code cache lock.
3359 BufferBlob* blob = this->scratch_buffer_blob();
3360 assert(blob != nullptr, "Initialize BufferBlob at start");
3361 assert(blob->size() > MAX_inst_size, "sanity");
3362 relocInfo* locs_buf = scratch_locs_memory();
3363 address blob_begin = blob->content_begin();
3364 address blob_end = (address)locs_buf;
3365 assert(blob->contains(blob_end), "sanity");
3366 CodeBuffer buf(blob_begin, blob_end - blob_begin);
3367 buf.initialize_consts_size(_scratch_const_size);
3368 buf.initialize_stubs_size(MAX_stubs_size);
3369 assert(locs_buf != nullptr, "sanity");
3370 int lsize = MAX_locs_size / 3;
3371 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
3372 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
3373 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
3374 // Mark as scratch buffer.
3375 buf.consts()->set_scratch_emit();
3376 buf.insts()->set_scratch_emit();
3377 buf.stubs()->set_scratch_emit();
3378
3379 // Do the emission.
3380
3381 Label fakeL; // Fake label for branch instructions.
3382 Label* saveL = nullptr;
3383 uint save_bnum = 0;
3384 bool is_branch = n->is_MachBranch();
3385 C2_MacroAssembler masm(&buf);
3386 masm.bind(fakeL);
3387 if (is_branch) {
3388 n->as_MachBranch()->save_label(&saveL, &save_bnum);
3389 n->as_MachBranch()->label_set(&fakeL, 0);
3390 }
3391 n->emit(&masm, C->regalloc());
3392
3393 // Emitting into the scratch buffer should not fail
3394 assert (!C->failing(), "Must not have pending failure. Reason is: %s", C->failure_reason());
3395
3396 if (is_branch) // Restore label.
3397 n->as_MachBranch()->label_set(saveL, save_bnum);
3398
3399 // End scratch_emit_size section.
3400 set_in_scratch_emit_size(false);
3401
3402 return buf.insts_size();
3403 }
3404
3405 void PhaseOutput::install() {
3406 if (C->should_install_code() && C->stub_function() != nullptr) {
3407 install_stub(C->stub_name());
3408 } else {
3409 install_code(C->method(),
3410 C->entry_bci(),
3411 CompilerThread::current()->compiler(),
3412 C->has_unsafe_access(),
3413 SharedRuntime::is_wide_vector(C->max_vector_size()));
3414 }
3415 }
3416
3417 void PhaseOutput::install_code(ciMethod* target,
3418 int entry_bci,
3419 AbstractCompiler* compiler,
3420 bool has_unsafe_access,
3421 bool has_wide_vectors) {
3422 // Check if we want to skip execution of all compiled code.
3423 {
3424 #ifndef PRODUCT
3425 if (OptoNoExecute) {
3426 C->record_method_not_compilable("+OptoNoExecute"); // Flag as failed
3427 return;
3428 }
3429 #endif
3430 Compile::TracePhase tp("install_code", &timers[_t_registerMethod]);
3431
3432 if (C->is_osr_compilation()) {
3433 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
3434 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
3435 } else {
3436 if (!target->is_static()) {
3437 // The UEP of an nmethod ensures that the VEP is padded. However, the padding of the UEP is placed
3438 // before the inline cache check, so we don't have to execute any nop instructions when dispatching
3439 // through the UEP, yet we can ensure that the VEP is aligned appropriately.
3440 _code_offsets.set_value(CodeOffsets::Entry, _first_block_size - MacroAssembler::ic_check_size());
3441 }
3442 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
3443 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
3444 }
3445
3446 C->env()->register_method(target,
3447 entry_bci,
3448 &_code_offsets,
3449 _orig_pc_slot_offset_in_bytes,
3450 code_buffer(),
3451 frame_size_in_words(),
3452 oop_map_set(),
3453 &_handler_table,
3454 inc_table(),
3455 compiler,
3456 C->has_clinit_barriers(),
3457 C->for_preload(),
3458 has_unsafe_access,
3459 SharedRuntime::is_wide_vector(C->max_vector_size()),
3460 C->has_monitors(),
3461 C->has_scoped_access(),
3462 0,
3463 C->should_install_code());
3464
3465 if (C->log() != nullptr) { // Print code cache state into compiler log
3466 C->log()->code_cache_state();
3467 }
3468 if (C->has_clinit_barriers()) {
3469 assert(C->for_preload(), "sanity");
3470 // Build second version of code without class initialization barriers
3471 if (C->env()->task()->compile_reason() == CompileTask::Reason_PrecompileForPreload) {
3472 // don't automatically precompile a barrier-free version unless explicitly asked
3473 } else {
3474 C->record_failure(C2Compiler::retry_no_clinit_barriers());
3475 }
3476 }
3477 }
3478 }
3479 void PhaseOutput::install_stub(const char* stub_name) {
3480 // Entry point will be accessed using stub_entry_point();
3481 if (code_buffer() == nullptr) {
3482 Matcher::soft_match_failure();
3483 } else {
3484 if (PrintAssembly && (WizardMode || Verbose))
3485 tty->print_cr("### Stub::%s", stub_name);
3486
3487 if (!C->failing()) {
3488 assert(C->fixed_slots() == 0, "no fixed slots used for runtime stubs");
3489
3490 // Make the NMethod
3491 // For now we mark the frame as never safe for profile stackwalking
3492 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
3493 code_buffer(),
3494 CodeOffsets::frame_never_safe,
3495 // _code_offsets.value(CodeOffsets::Frame_Complete),
3496 frame_size_in_words(),
3497 oop_map_set(),
3498 false);
3499 assert(rs != nullptr && rs->is_runtime_stub(), "sanity check");
3500
3501 C->set_stub_entry_point(rs->entry_point());
3502 }
3503 }
3504 }
3505
3506 // Support for bundling info
3507 Bundle* PhaseOutput::node_bundling(const Node *n) {
3508 assert(valid_bundle_info(n), "oob");
3509 return &_node_bundling_base[n->_idx];
3510 }
3511
3512 bool PhaseOutput::valid_bundle_info(const Node *n) {
3513 return (_node_bundling_limit > n->_idx);
3514 }
3515
3516 //------------------------------frame_size_in_words-----------------------------
3517 // frame_slots in units of words
3518 int PhaseOutput::frame_size_in_words() const {
3519 // shift is 0 in LP32 and 1 in LP64
3520 const int shift = (LogBytesPerWord - LogBytesPerInt);
3521 int words = _frame_slots >> shift;
3522 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
3523 return words;
3524 }
3525
3526 // To bang the stack of this compiled method we use the stack size
3527 // that the interpreter would need in case of a deoptimization. This
3528 // removes the need to bang the stack in the deoptimization blob which
3529 // in turn simplifies stack overflow handling.
3530 int PhaseOutput::bang_size_in_bytes() const {
3531 return MAX2(frame_size_in_bytes() + os::extra_bang_size_in_bytes(), C->interpreter_frame_size());
3532 }
3533
3534 //------------------------------dump_asm---------------------------------------
3535 // Dump formatted assembly
3536 #if defined(SUPPORT_OPTO_ASSEMBLY)
3537 void PhaseOutput::dump_asm_on(outputStream* st, int* pcs, uint pc_limit) {
3538
3539 int pc_digits = 3; // #chars required for pc
3540 int sb_chars = 3; // #chars for "start bundle" indicator
3541 int tab_size = 8;
3542 if (pcs != nullptr) {
3543 int max_pc = 0;
3544 for (uint i = 0; i < pc_limit; i++) {
3545 max_pc = (max_pc < pcs[i]) ? pcs[i] : max_pc;
3546 }
3547 pc_digits = ((max_pc < 4096) ? 3 : ((max_pc < 65536) ? 4 : ((max_pc < 65536*256) ? 6 : 8))); // #chars required for pc
3548 }
3549 int prefix_len = ((pc_digits + sb_chars + tab_size - 1)/tab_size)*tab_size;
3550
3551 bool cut_short = false;
3552 st->print_cr("#");
3553 st->print("# "); C->tf()->dump_on(st); st->cr();
3554 st->print_cr("#");
3555
3556 // For all blocks
3557 int pc = 0x0; // Program counter
3558 char starts_bundle = ' ';
3559 C->regalloc()->dump_frame();
3560
3561 Node *n = nullptr;
3562 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
3563 if (VMThread::should_terminate()) {
3564 cut_short = true;
3565 break;
3566 }
3567 Block* block = C->cfg()->get_block(i);
3568 if (block->is_connector() && !Verbose) {
3569 continue;
3570 }
3571 n = block->head();
3572 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3573 pc = pcs[n->_idx];
3574 st->print("%*.*x", pc_digits, pc_digits, pc);
3575 }
3576 st->fill_to(prefix_len);
3577 block->dump_head(C->cfg(), st);
3578 if (block->is_connector()) {
3579 st->fill_to(prefix_len);
3580 st->print_cr("# Empty connector block");
3581 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
3582 st->fill_to(prefix_len);
3583 st->print_cr("# Block is sole successor of call");
3584 }
3585
3586 // For all instructions
3587 Node *delay = nullptr;
3588 for (uint j = 0; j < block->number_of_nodes(); j++) {
3589 if (VMThread::should_terminate()) {
3590 cut_short = true;
3591 break;
3592 }
3593 n = block->get_node(j);
3594 if (valid_bundle_info(n)) {
3595 Bundle* bundle = node_bundling(n);
3596 if (bundle->used_in_unconditional_delay()) {
3597 delay = n;
3598 continue;
3599 }
3600 if (bundle->starts_bundle()) {
3601 starts_bundle = '+';
3602 }
3603 }
3604
3605 if (WizardMode) {
3606 n->dump();
3607 }
3608
3609 if( !n->is_Region() && // Dont print in the Assembly
3610 !n->is_Phi() && // a few noisely useless nodes
3611 !n->is_Proj() &&
3612 !n->is_MachTemp() &&
3613 !n->is_SafePointScalarObject() &&
3614 !n->is_Catch() && // Would be nice to print exception table targets
3615 !n->is_MergeMem() && // Not very interesting
3616 !n->is_top() && // Debug info table constants
3617 !(n->is_Con() && !n->is_Mach())// Debug info table constants
3618 ) {
3619 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3620 pc = pcs[n->_idx];
3621 st->print("%*.*x", pc_digits, pc_digits, pc);
3622 } else {
3623 st->fill_to(pc_digits);
3624 }
3625 st->print(" %c ", starts_bundle);
3626 starts_bundle = ' ';
3627 st->fill_to(prefix_len);
3628 n->format(C->regalloc(), st);
3629 st->cr();
3630 }
3631
3632 // If we have an instruction with a delay slot, and have seen a delay,
3633 // then back up and print it
3634 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
3635 // Coverity finding - Explicit null dereferenced.
3636 guarantee(delay != nullptr, "no unconditional delay instruction");
3637 if (WizardMode) delay->dump();
3638
3639 if (node_bundling(delay)->starts_bundle())
3640 starts_bundle = '+';
3641 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3642 pc = pcs[n->_idx];
3643 st->print("%*.*x", pc_digits, pc_digits, pc);
3644 } else {
3645 st->fill_to(pc_digits);
3646 }
3647 st->print(" %c ", starts_bundle);
3648 starts_bundle = ' ';
3649 st->fill_to(prefix_len);
3650 delay->format(C->regalloc(), st);
3651 st->cr();
3652 delay = nullptr;
3653 }
3654
3655 // Dump the exception table as well
3656 if( n->is_Catch() && (Verbose || WizardMode) ) {
3657 // Print the exception table for this offset
3658 _handler_table.print_subtable_for(pc);
3659 }
3660 st->bol(); // Make sure we start on a new line
3661 }
3662 st->cr(); // one empty line between blocks
3663 assert(cut_short || delay == nullptr, "no unconditional delay branch");
3664 } // End of per-block dump
3665
3666 if (cut_short) st->print_cr("*** disassembly is cut short ***");
3667 }
3668 #endif
3669
3670 #ifndef PRODUCT
3671 void PhaseOutput::print_statistics() {
3672 Scheduling::print_statistics();
3673 }
3674 #endif