1 /*
2 * Copyright (c) 1998, 2025, 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 "asm/assembler.inline.hpp"
26 #include "code/aotCodeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/debugInfo.hpp"
29 #include "code/debugInfoRec.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compilerDirectives.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/barrierSet.hpp"
35 #include "gc/shared/c2/barrierSetC2.hpp"
36 #include "memory/allocation.hpp"
37 #include "opto/ad.hpp"
38 #include "opto/block.hpp"
39 #include "opto/c2_MacroAssembler.hpp"
40 #include "opto/c2compiler.hpp"
41 #include "opto/callnode.hpp"
42 #include "opto/cfgnode.hpp"
43 #include "opto/locknode.hpp"
44 #include "opto/machnode.hpp"
45 #include "opto/node.hpp"
46 #include "opto/optoreg.hpp"
47 #include "opto/output.hpp"
48 #include "opto/regalloc.hpp"
49 #include "opto/type.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "utilities/macros.hpp"
52 #include "utilities/powerOfTwo.hpp"
53 #include "utilities/xmlstream.hpp"
54
55 #ifndef PRODUCT
56 #define DEBUG_ARG(x) , x
57 #else
58 #define DEBUG_ARG(x)
59 #endif
60
61 //------------------------------Scheduling----------------------------------
62 // This class contains all the information necessary to implement instruction
63 // scheduling and bundling.
64 class Scheduling {
65
66 private:
67 // Arena to use
68 Arena *_arena;
69
70 // Control-Flow Graph info
71 PhaseCFG *_cfg;
72
73 // Register Allocation info
74 PhaseRegAlloc *_regalloc;
75
76 // Number of nodes in the method
77 uint _node_bundling_limit;
78
79 // List of scheduled nodes. Generated in reverse order
80 Node_List _scheduled;
81
82 // List of nodes currently available for choosing for scheduling
83 Node_List _available;
84
85 // For each instruction beginning a bundle, the number of following
86 // nodes to be bundled with it.
87 Bundle *_node_bundling_base;
88
89 // Mapping from register to Node
90 Node_List _reg_node;
91
92 // Free list for pinch nodes.
93 Node_List _pinch_free_list;
94
95 // Number of uses of this node within the containing basic block.
96 short *_uses;
97
98 // Schedulable portion of current block. Skips Region/Phi/CreateEx up
99 // front, branch+proj at end. Also skips Catch/CProj (same as
100 // branch-at-end), plus just-prior exception-throwing call.
101 uint _bb_start, _bb_end;
102
103 // Latency from the end of the basic block as scheduled
104 unsigned short *_current_latency;
105
106 // Remember the next node
107 Node *_next_node;
108
109 // Use this for an unconditional branch delay slot
110 Node *_unconditional_delay_slot;
111
112 // Pointer to a Nop
113 MachNopNode *_nop;
114
115 // Length of the current bundle, in instructions
116 uint _bundle_instr_count;
117
118 // Current Cycle number, for computing latencies and bundling
119 uint _bundle_cycle_number;
120
121 // Bundle information
122 Pipeline_Use_Element _bundle_use_elements[resource_count];
123 Pipeline_Use _bundle_use;
124
125 // Dump the available list
126 void dump_available() const;
127
128 public:
129 Scheduling(Arena *arena, Compile &compile);
130
131 // Destructor
132 NOT_PRODUCT( ~Scheduling(); )
133
134 // Step ahead "i" cycles
135 void step(uint i);
136
137 // Step ahead 1 cycle, and clear the bundle state (for example,
138 // at a branch target)
139 void step_and_clear();
140
141 Bundle* node_bundling(const Node *n) {
142 assert(valid_bundle_info(n), "oob");
143 return (&_node_bundling_base[n->_idx]);
144 }
145
146 bool valid_bundle_info(const Node *n) const {
147 return (_node_bundling_limit > n->_idx);
148 }
149
150 bool starts_bundle(const Node *n) const {
151 return (_node_bundling_limit > n->_idx && _node_bundling_base[n->_idx].starts_bundle());
152 }
153
154 // Do the scheduling
155 void DoScheduling();
156
157 // Compute the register antidependencies within a basic block
158 void ComputeRegisterAntidependencies(Block *bb);
159 void verify_do_def( Node *n, OptoReg::Name def, const char *msg );
160 void verify_good_schedule( Block *b, const char *msg );
161 void anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def );
162 void anti_do_use( Block *b, Node *use, OptoReg::Name use_reg );
163
164 // Add a node to the current bundle
165 void AddNodeToBundle(Node *n, const Block *bb);
166
167 // Return an integer less than, equal to, or greater than zero
168 // if the stack offset of the first argument is respectively
169 // less than, equal to, or greater than the second.
170 int compare_two_spill_nodes(Node* first, Node* second);
171
172 // Add a node to the list of available nodes
173 void AddNodeToAvailableList(Node *n);
174
175 // Compute the local use count for the nodes in a block, and compute
176 // the list of instructions with no uses in the block as available
177 void ComputeUseCount(const Block *bb);
178
179 // Choose an instruction from the available list to add to the bundle
180 Node * ChooseNodeToBundle();
181
182 // See if this Node fits into the currently accumulating bundle
183 bool NodeFitsInBundle(Node *n);
184
185 // Decrement the use count for a node
186 void DecrementUseCounts(Node *n, const Block *bb);
187
188 // Garbage collect pinch nodes for reuse by other blocks.
189 void garbage_collect_pinch_nodes();
190 // Clean up a pinch node for reuse (helper for above).
191 void cleanup_pinch( Node *pinch );
192
193 // Information for statistics gathering
194 #ifndef PRODUCT
195 private:
196 // Gather information on size of nops relative to total
197 uint _branches, _unconditional_delays;
198
199 static uint _total_nop_size, _total_method_size;
200 static uint _total_branches, _total_unconditional_delays;
201 static uint _total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
202
203 public:
204 static void print_statistics();
205
206 static void increment_instructions_per_bundle(uint i) {
207 _total_instructions_per_bundle[i]++;
208 }
209
210 static void increment_nop_size(uint s) {
211 _total_nop_size += s;
212 }
213
214 static void increment_method_size(uint s) {
215 _total_method_size += s;
216 }
217 #endif
218
219 };
220
221 PhaseOutput::PhaseOutput()
222 : Phase(Phase::Output),
223 _code_buffer("Compile::Fill_buffer"),
224 _first_block_size(0),
225 _handler_table(),
226 _inc_table(),
227 _stub_list(),
228 _oop_map_set(nullptr),
229 _scratch_buffer_blob(nullptr),
230 _scratch_locs_memory(nullptr),
231 _scratch_const_size(-1),
232 _in_scratch_emit_size(false),
233 _frame_slots(0),
234 _code_offsets(),
235 _node_bundling_limit(0),
236 _node_bundling_base(nullptr),
237 _orig_pc_slot(0),
238 _orig_pc_slot_offset_in_bytes(0),
239 _buf_sizes(),
240 _block(nullptr),
241 _index(0) {
242 C->set_output(this);
243 if (C->stub_name() == nullptr) {
244 _orig_pc_slot = C->fixed_slots() - (sizeof(address) / VMRegImpl::stack_slot_size);
245 }
246 }
247
248 PhaseOutput::~PhaseOutput() {
249 C->set_output(nullptr);
250 if (_scratch_buffer_blob != nullptr) {
251 BufferBlob::free(_scratch_buffer_blob);
252 }
253 }
254
255 void PhaseOutput::perform_mach_node_analysis() {
256 // Late barrier analysis must be done after schedule and bundle
257 // Otherwise liveness based spilling will fail
258 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
259 bs->late_barrier_analysis();
260
261 pd_perform_mach_node_analysis();
262
263 C->print_method(CompilerPhaseType::PHASE_MACH_ANALYSIS, 3);
264 }
265
266 // Convert Nodes to instruction bits and pass off to the VM
267 void PhaseOutput::Output() {
268 // RootNode goes
269 assert( C->cfg()->get_root_block()->number_of_nodes() == 0, "" );
270
271 // The number of new nodes (mostly MachNop) is proportional to
272 // the number of java calls and inner loops which are aligned.
273 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 +
274 C->inner_loops()*(OptoLoopAlignment-1)),
275 "out of nodes before code generation" ) ) {
276 return;
277 }
278 // Make sure I can find the Start Node
279 Block *entry = C->cfg()->get_block(1);
280 Block *broot = C->cfg()->get_root_block();
281
282 const StartNode *start = entry->head()->as_Start();
283
284 // Replace StartNode with prolog
285 MachPrologNode *prolog = new MachPrologNode();
286 entry->map_node(prolog, 0);
287 C->cfg()->map_node_to_block(prolog, entry);
288 C->cfg()->unmap_node_from_block(start); // start is no longer in any block
289
290 // Virtual methods need an unverified entry point
291
292 if( C->is_osr_compilation() ) {
293 if( PoisonOSREntry ) {
294 // TODO: Should use a ShouldNotReachHereNode...
295 C->cfg()->insert( broot, 0, new MachBreakpointNode() );
296 }
297 } else {
298 if( C->method() && !C->method()->flags().is_static() ) {
299 // Insert unvalidated entry point
300 C->cfg()->insert( broot, 0, new MachUEPNode() );
301 }
302
303 }
304
305 // Break before main entry point
306 if ((C->method() && C->directive()->BreakAtExecuteOption) ||
307 (OptoBreakpoint && C->is_method_compilation()) ||
308 (OptoBreakpointOSR && C->is_osr_compilation()) ||
309 (OptoBreakpointC2R && !C->method()) ) {
310 // checking for C->method() means that OptoBreakpoint does not apply to
311 // runtime stubs or frame converters
312 C->cfg()->insert( entry, 1, new MachBreakpointNode() );
313 }
314
315 // Insert epilogs before every return
316 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
317 Block* block = C->cfg()->get_block(i);
318 if (!block->is_connector() && block->non_connector_successor(0) == C->cfg()->get_root_block()) { // Found a program exit point?
319 Node* m = block->end();
320 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) {
321 MachEpilogNode* epilog = new MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return);
322 block->add_inst(epilog);
323 C->cfg()->map_node_to_block(epilog, block);
324 }
325 }
326 }
327
328 // Keeper of sizing aspects
329 _buf_sizes = BufferSizingData();
330
331 // Initialize code buffer
332 estimate_buffer_size(_buf_sizes._const);
333 if (C->failing()) return;
334
335 // Pre-compute the length of blocks and replace
336 // long branches with short if machine supports it.
337 // Must be done before ScheduleAndBundle due to SPARC delay slots
338 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, C->cfg()->number_of_blocks() + 1);
339 blk_starts[0] = 0;
340 shorten_branches(blk_starts);
341
342 ScheduleAndBundle();
343 if (C->failing()) {
344 return;
345 }
346
347 perform_mach_node_analysis();
348
349 // Complete sizing of codebuffer
350 CodeBuffer* cb = init_buffer();
351 if (cb == nullptr || C->failing()) {
352 return;
353 }
354
355 BuildOopMaps();
356
357 if (C->failing()) {
358 return;
359 }
360
361 C2_MacroAssembler masm(cb);
362 fill_buffer(&masm, blk_starts);
363 }
364
365 bool PhaseOutput::need_stack_bang(int frame_size_in_bytes) const {
366 // Determine if we need to generate a stack overflow check.
367 // Do it if the method is not a stub function and
368 // has java calls or has frame size > vm_page_size/8.
369 // The debug VM checks that deoptimization doesn't trigger an
370 // unexpected stack overflow (compiled method stack banging should
371 // guarantee it doesn't happen) so we always need the stack bang in
372 // a debug VM.
373 return (C->stub_function() == nullptr &&
374 (C->has_java_calls() || frame_size_in_bytes > (int)(os::vm_page_size())>>3
375 DEBUG_ONLY(|| true)));
376 }
377
378 bool PhaseOutput::need_register_stack_bang() const {
379 // Determine if we need to generate a register stack overflow check.
380 // This is only used on architectures which have split register
381 // and memory stacks.
382 // Bang if the method is not a stub function and has java calls
383 return (C->stub_function() == nullptr && C->has_java_calls());
384 }
385
386
387 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top
388 // of a loop. When aligning a loop we need to provide enough instructions
389 // in cpu's fetch buffer to feed decoders. The loop alignment could be
390 // avoided if we have enough instructions in fetch buffer at the head of a loop.
391 // By default, the size is set to 999999 by Block's constructor so that
392 // a loop will be aligned if the size is not reset here.
393 //
394 // Note: Mach instructions could contain several HW instructions
395 // so the size is estimated only.
396 //
397 void PhaseOutput::compute_loop_first_inst_sizes() {
398 // The next condition is used to gate the loop alignment optimization.
399 // Don't aligned a loop if there are enough instructions at the head of a loop
400 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad
401 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is
402 // equal to 11 bytes which is the largest address NOP instruction.
403 if (MaxLoopPad < OptoLoopAlignment - 1) {
404 uint last_block = C->cfg()->number_of_blocks() - 1;
405 for (uint i = 1; i <= last_block; i++) {
406 Block* block = C->cfg()->get_block(i);
407 // Check the first loop's block which requires an alignment.
408 if (block->loop_alignment() > (uint)relocInfo::addr_unit()) {
409 uint sum_size = 0;
410 uint inst_cnt = NumberOfLoopInstrToAlign;
411 inst_cnt = block->compute_first_inst_size(sum_size, inst_cnt, C->regalloc());
412
413 // Check subsequent fallthrough blocks if the loop's first
414 // block(s) does not have enough instructions.
415 Block *nb = block;
416 while(inst_cnt > 0 &&
417 i < last_block &&
418 !C->cfg()->get_block(i + 1)->has_loop_alignment() &&
419 !nb->has_successor(block)) {
420 i++;
421 nb = C->cfg()->get_block(i);
422 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, C->regalloc());
423 } // while( inst_cnt > 0 && i < last_block )
424
425 block->set_first_inst_size(sum_size);
426 } // f( b->head()->is_Loop() )
427 } // for( i <= last_block )
428 } // if( MaxLoopPad < OptoLoopAlignment-1 )
429 }
430
431 // The architecture description provides short branch variants for some long
432 // branch instructions. Replace eligible long branches with short branches.
433 void PhaseOutput::shorten_branches(uint* blk_starts) {
434
435 Compile::TracePhase tp(_t_shortenBranches);
436
437 // Compute size of each block, method size, and relocation information size
438 uint nblocks = C->cfg()->number_of_blocks();
439
440 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
441 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
442 int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks);
443
444 // Collect worst case block paddings
445 int* block_worst_case_pad = NEW_RESOURCE_ARRAY(int, nblocks);
446 memset(block_worst_case_pad, 0, nblocks * sizeof(int));
447
448 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); )
449 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); )
450
451 bool has_short_branch_candidate = false;
452
453 // Initialize the sizes to 0
454 int code_size = 0; // Size in bytes of generated code
455 int stub_size = 0; // Size in bytes of all stub entries
456 // Size in bytes of all relocation entries, including those in local stubs.
457 // Start with 2-bytes of reloc info for the unvalidated entry point
458 int reloc_size = 1; // Number of relocation entries
459
460 // Make three passes. The first computes pessimistic blk_starts,
461 // relative jmp_offset and reloc_size information. The second performs
462 // short branch substitution using the pessimistic sizing. The
463 // third inserts nops where needed.
464
465 // Step one, perform a pessimistic sizing pass.
466 uint last_call_adr = max_juint;
467 uint last_avoid_back_to_back_adr = max_juint;
468 uint nop_size = (new MachNopNode())->size(C->regalloc());
469 for (uint i = 0; i < nblocks; i++) { // For all blocks
470 Block* block = C->cfg()->get_block(i);
471 _block = block;
472
473 // During short branch replacement, we store the relative (to blk_starts)
474 // offset of jump in jmp_offset, rather than the absolute offset of jump.
475 // This is so that we do not need to recompute sizes of all nodes when
476 // we compute correct blk_starts in our next sizing pass.
477 jmp_offset[i] = 0;
478 jmp_size[i] = 0;
479 jmp_nidx[i] = -1;
480 DEBUG_ONLY( jmp_target[i] = 0; )
481 DEBUG_ONLY( jmp_rule[i] = 0; )
482
483 // Sum all instruction sizes to compute block size
484 uint last_inst = block->number_of_nodes();
485 uint blk_size = 0;
486 for (uint j = 0; j < last_inst; j++) {
487 _index = j;
488 Node* nj = block->get_node(_index);
489 // Handle machine instruction nodes
490 if (nj->is_Mach()) {
491 MachNode* mach = nj->as_Mach();
492 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding
493 reloc_size += mach->reloc();
494 if (mach->is_MachCall()) {
495 // add size information for trampoline stub
496 // class CallStubImpl is platform-specific and defined in the *.ad files.
497 stub_size += CallStubImpl::size_call_trampoline();
498 reloc_size += CallStubImpl::reloc_call_trampoline();
499
500 MachCallNode *mcall = mach->as_MachCall();
501 // This destination address is NOT PC-relative
502
503 mcall->method_set((intptr_t)mcall->entry_point());
504
505 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) {
506 stub_size += CompiledDirectCall::to_interp_stub_size();
507 reloc_size += CompiledDirectCall::reloc_to_interp_stub();
508 }
509 } else if (mach->is_MachSafePoint()) {
510 // If call/safepoint are adjacent, account for possible
511 // nop to disambiguate the two safepoints.
512 // ScheduleAndBundle() can rearrange nodes in a block,
513 // check for all offsets inside this block.
514 if (last_call_adr >= blk_starts[i]) {
515 blk_size += nop_size;
516 }
517 }
518 if (mach->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
519 // Nop is inserted between "avoid back to back" instructions.
520 // ScheduleAndBundle() can rearrange nodes in a block,
521 // check for all offsets inside this block.
522 if (last_avoid_back_to_back_adr >= blk_starts[i]) {
523 blk_size += nop_size;
524 }
525 }
526 if (mach->may_be_short_branch()) {
527 if (!nj->is_MachBranch()) {
528 #ifndef PRODUCT
529 nj->dump(3);
530 #endif
531 Unimplemented();
532 }
533 assert(jmp_nidx[i] == -1, "block should have only one branch");
534 jmp_offset[i] = blk_size;
535 jmp_size[i] = nj->size(C->regalloc());
536 jmp_nidx[i] = j;
537 has_short_branch_candidate = true;
538 }
539 }
540 blk_size += nj->size(C->regalloc());
541 // Remember end of call offset
542 if (nj->is_MachCall() && !nj->is_MachCallLeaf()) {
543 last_call_adr = blk_starts[i]+blk_size;
544 }
545 // Remember end of avoid_back_to_back offset
546 if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
547 last_avoid_back_to_back_adr = blk_starts[i]+blk_size;
548 }
549 }
550
551 // When the next block starts a loop, we may insert pad NOP
552 // instructions. Since we cannot know our future alignment,
553 // assume the worst.
554 if (i < nblocks - 1) {
555 Block* nb = C->cfg()->get_block(i + 1);
556 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit();
557 if (max_loop_pad > 0) {
558 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), "");
559 // Adjust last_call_adr and/or last_avoid_back_to_back_adr.
560 // If either is the last instruction in this block, bump by
561 // max_loop_pad in lock-step with blk_size, so sizing
562 // calculations in subsequent blocks still can conservatively
563 // detect that it may the last instruction in this block.
564 if (last_call_adr == blk_starts[i]+blk_size) {
565 last_call_adr += max_loop_pad;
566 }
567 if (last_avoid_back_to_back_adr == blk_starts[i]+blk_size) {
568 last_avoid_back_to_back_adr += max_loop_pad;
569 }
570 blk_size += max_loop_pad;
571 block_worst_case_pad[i + 1] = max_loop_pad;
572 }
573 }
574
575 // Save block size; update total method size
576 blk_starts[i+1] = blk_starts[i]+blk_size;
577 }
578
579 // Step two, replace eligible long jumps.
580 bool progress = true;
581 uint last_may_be_short_branch_adr = max_juint;
582 while (has_short_branch_candidate && progress) {
583 progress = false;
584 has_short_branch_candidate = false;
585 int adjust_block_start = 0;
586 for (uint i = 0; i < nblocks; i++) {
587 Block* block = C->cfg()->get_block(i);
588 int idx = jmp_nidx[i];
589 MachNode* mach = (idx == -1) ? nullptr: block->get_node(idx)->as_Mach();
590 if (mach != nullptr && mach->may_be_short_branch()) {
591 #ifdef ASSERT
592 assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity");
593 int j;
594 // Find the branch; ignore trailing NOPs.
595 for (j = block->number_of_nodes()-1; j>=0; j--) {
596 Node* n = block->get_node(j);
597 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con)
598 break;
599 }
600 assert(j >= 0 && j == idx && block->get_node(j) == (Node*)mach, "sanity");
601 #endif
602 int br_size = jmp_size[i];
603 int br_offs = blk_starts[i] + jmp_offset[i];
604
605 // This requires the TRUE branch target be in succs[0]
606 uint bnum = block->non_connector_successor(0)->_pre_order;
607 int offset = blk_starts[bnum] - br_offs;
608 if (bnum > i) { // adjust following block's offset
609 offset -= adjust_block_start;
610 }
611
612 // This block can be a loop header, account for the padding
613 // in the previous block.
614 int block_padding = block_worst_case_pad[i];
615 assert(i == 0 || block_padding == 0 || br_offs >= block_padding, "Should have at least a padding on top");
616 // In the following code a nop could be inserted before
617 // the branch which will increase the backward distance.
618 bool needs_padding = ((uint)(br_offs - block_padding) == last_may_be_short_branch_adr);
619 assert(!needs_padding || jmp_offset[i] == 0, "padding only branches at the beginning of block");
620
621 if (needs_padding && offset <= 0)
622 offset -= nop_size;
623
624 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
625 // We've got a winner. Replace this branch.
626 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
627
628 // Update the jmp_size.
629 int new_size = replacement->size(C->regalloc());
630 int diff = br_size - new_size;
631 assert(diff >= (int)nop_size, "short_branch size should be smaller");
632 // Conservatively take into account padding between
633 // avoid_back_to_back branches. Previous branch could be
634 // converted into avoid_back_to_back branch during next
635 // rounds.
636 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
637 jmp_offset[i] += nop_size;
638 diff -= nop_size;
639 }
640 adjust_block_start += diff;
641 block->map_node(replacement, idx);
642 mach->subsume_by(replacement, C);
643 mach = replacement;
644 progress = true;
645
646 jmp_size[i] = new_size;
647 DEBUG_ONLY( jmp_target[i] = bnum; );
648 DEBUG_ONLY( jmp_rule[i] = mach->rule(); );
649 } else {
650 // The jump distance is not short, try again during next iteration.
651 has_short_branch_candidate = true;
652 }
653 } // (mach->may_be_short_branch())
654 if (mach != nullptr && (mach->may_be_short_branch() ||
655 mach->avoid_back_to_back(MachNode::AVOID_AFTER))) {
656 last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i];
657 }
658 blk_starts[i+1] -= adjust_block_start;
659 }
660 }
661
662 #ifdef ASSERT
663 for (uint i = 0; i < nblocks; i++) { // For all blocks
664 if (jmp_target[i] != 0) {
665 int br_size = jmp_size[i];
666 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
667 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
668 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]);
669 }
670 assert(C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp");
671 }
672 }
673 #endif
674
675 // Step 3, compute the offsets of all blocks, will be done in fill_buffer()
676 // after ScheduleAndBundle().
677
678 // ------------------
679 // Compute size for code buffer
680 code_size = blk_starts[nblocks];
681
682 // Relocation records
683 reloc_size += 1; // Relo entry for exception handler
684
685 // Adjust reloc_size to number of record of relocation info
686 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for
687 // a relocation index.
688 // The CodeBuffer will expand the locs array if this estimate is too low.
689 reloc_size *= 10 / sizeof(relocInfo);
690
691 _buf_sizes._reloc = reloc_size;
692 _buf_sizes._code = code_size;
693 _buf_sizes._stub = stub_size;
694 }
695
696 //------------------------------FillLocArray-----------------------------------
697 // Create a bit of debug info and append it to the array. The mapping is from
698 // Java local or expression stack to constant, register or stack-slot. For
699 // doubles, insert 2 mappings and return 1 (to tell the caller that the next
700 // entry has been taken care of and caller should skip it).
701 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) {
702 // This should never have accepted Bad before
703 assert(OptoReg::is_valid(regnum), "location must be valid");
704 return (OptoReg::is_reg(regnum))
705 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) )
706 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum)));
707 }
708
709
710 ObjectValue*
711 PhaseOutput::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) {
712 for (int i = 0; i < objs->length(); i++) {
713 assert(objs->at(i)->is_object(), "corrupt object cache");
714 ObjectValue* sv = objs->at(i)->as_ObjectValue();
715 if (sv->id() == id) {
716 return sv;
717 }
718 }
719 // Otherwise..
720 return nullptr;
721 }
722
723 void PhaseOutput::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs,
724 ObjectValue* sv ) {
725 assert(sv_for_node_id(objs, sv->id()) == nullptr, "Precondition");
726 objs->append(sv);
727 }
728
729
730 void PhaseOutput::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local,
731 GrowableArray<ScopeValue*> *array,
732 GrowableArray<ScopeValue*> *objs ) {
733 assert( local, "use _top instead of null" );
734 if (array->length() != idx) {
735 assert(array->length() == idx + 1, "Unexpected array count");
736 // Old functionality:
737 // return
738 // New functionality:
739 // Assert if the local is not top. In product mode let the new node
740 // override the old entry.
741 assert(local == C->top(), "LocArray collision");
742 if (local == C->top()) {
743 return;
744 }
745 array->pop();
746 }
747 const Type *t = local->bottom_type();
748
749 // Is it a safepoint scalar object node?
750 if (local->is_SafePointScalarObject()) {
751 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject();
752
753 ObjectValue* sv = sv_for_node_id(objs, spobj->_idx);
754 if (sv == nullptr) {
755 ciKlass* cik = t->is_oopptr()->exact_klass();
756 assert(cik->is_instance_klass() ||
757 cik->is_array_klass(), "Not supported allocation.");
758 sv = new ObjectValue(spobj->_idx,
759 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
760 set_sv_for_object_node(objs, sv);
761
762 uint first_ind = spobj->first_index(sfpt->jvms());
763 for (uint i = 0; i < spobj->n_fields(); i++) {
764 Node* fld_node = sfpt->in(first_ind+i);
765 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs);
766 }
767 }
768 array->append(sv);
769 return;
770 } else if (local->is_SafePointScalarMerge()) {
771 SafePointScalarMergeNode* smerge = local->as_SafePointScalarMerge();
772 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
773
774 if (mv == nullptr) {
775 GrowableArray<ScopeValue*> deps;
776
777 int merge_pointer_idx = smerge->merge_pointer_idx(sfpt->jvms());
778 (void)FillLocArray(0, sfpt, sfpt->in(merge_pointer_idx), &deps, objs);
779 assert(deps.length() == 1, "missing value");
780
781 int selector_idx = smerge->selector_idx(sfpt->jvms());
782 (void)FillLocArray(1, nullptr, sfpt->in(selector_idx), &deps, nullptr);
783 assert(deps.length() == 2, "missing value");
784
785 mv = new ObjectMergeValue(smerge->_idx, deps.at(0), deps.at(1));
786 set_sv_for_object_node(objs, mv);
787
788 for (uint i = 1; i < smerge->req(); i++) {
789 Node* obj_node = smerge->in(i);
790 int idx = mv->possible_objects()->length();
791 (void)FillLocArray(idx, sfpt, obj_node, mv->possible_objects(), objs);
792
793 // By default ObjectValues that are in 'possible_objects' are not root objects.
794 // They will be marked as root later if they are directly referenced in a JVMS.
795 assert(mv->possible_objects()->length() > idx, "Didn't add entry to possible_objects?!");
796 assert(mv->possible_objects()->at(idx)->is_object(), "Entries in possible_objects should be ObjectValue.");
797 mv->possible_objects()->at(idx)->as_ObjectValue()->set_root(false);
798 }
799 }
800 array->append(mv);
801 return;
802 }
803
804 // Grab the register number for the local
805 OptoReg::Name regnum = C->regalloc()->get_reg_first(local);
806 if( OptoReg::is_valid(regnum) ) {// Got a register/stack?
807 // Record the double as two float registers.
808 // The register mask for such a value always specifies two adjacent
809 // float registers, with the lower register number even.
810 // Normally, the allocation of high and low words to these registers
811 // is irrelevant, because nearly all operations on register pairs
812 // (e.g., StoreD) treat them as a single unit.
813 // Here, we assume in addition that the words in these two registers
814 // stored "naturally" (by operations like StoreD and double stores
815 // within the interpreter) such that the lower-numbered register
816 // is written to the lower memory address. This may seem like
817 // a machine dependency, but it is not--it is a requirement on
818 // the author of the <arch>.ad file to ensure that, for every
819 // even/odd double-register pair to which a double may be allocated,
820 // the word in the even single-register is stored to the first
821 // memory word. (Note that register numbers are completely
822 // arbitrary, and are not tied to any machine-level encodings.)
823 #ifdef _LP64
824 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) {
825 array->append(new ConstantIntValue((jint)0));
826 array->append(new_loc_value( C->regalloc(), regnum, Location::dbl ));
827 } else if ( t->base() == Type::Long ) {
828 array->append(new ConstantIntValue((jint)0));
829 array->append(new_loc_value( C->regalloc(), regnum, Location::lng ));
830 } else if ( t->base() == Type::RawPtr ) {
831 // jsr/ret return address which must be restored into the full
832 // width 64-bit stack slot.
833 array->append(new_loc_value( C->regalloc(), regnum, Location::lng ));
834 }
835 #else //_LP64
836 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) {
837 // Repack the double/long as two jints.
838 // The convention the interpreter uses is that the second local
839 // holds the first raw word of the native double representation.
840 // This is actually reasonable, since locals and stack arrays
841 // grow downwards in all implementations.
842 // (If, on some machine, the interpreter's Java locals or stack
843 // were to grow upwards, the embedded doubles would be word-swapped.)
844 array->append(new_loc_value( C->regalloc(), OptoReg::add(regnum,1), Location::normal ));
845 array->append(new_loc_value( C->regalloc(), regnum , Location::normal ));
846 }
847 #endif //_LP64
848 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) &&
849 OptoReg::is_reg(regnum) ) {
850 array->append(new_loc_value( C->regalloc(), regnum, Matcher::float_in_double()
851 ? Location::float_in_dbl : Location::normal ));
852 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) {
853 array->append(new_loc_value( C->regalloc(), regnum, Matcher::int_in_long
854 ? Location::int_in_long : Location::normal ));
855 } else if( t->base() == Type::NarrowOop ) {
856 array->append(new_loc_value( C->regalloc(), regnum, Location::narrowoop ));
857 } else if (t->base() == Type::VectorA || t->base() == Type::VectorS ||
858 t->base() == Type::VectorD || t->base() == Type::VectorX ||
859 t->base() == Type::VectorY || t->base() == Type::VectorZ) {
860 array->append(new_loc_value( C->regalloc(), regnum, Location::vector ));
861 } else if (C->regalloc()->is_oop(local)) {
862 assert(t->base() == Type::OopPtr || t->base() == Type::InstPtr ||
863 t->base() == Type::AryPtr,
864 "Unexpected type: %s", t->msg());
865 array->append(new_loc_value( C->regalloc(), regnum, Location::oop ));
866 } else {
867 assert(t->base() == Type::Int || t->base() == Type::Half ||
868 t->base() == Type::FloatCon || t->base() == Type::FloatBot,
869 "Unexpected type: %s", t->msg());
870 array->append(new_loc_value( C->regalloc(), regnum, Location::normal ));
871 }
872 return;
873 }
874
875 // No register. It must be constant data.
876 switch (t->base()) {
877 case Type::Half: // Second half of a double
878 ShouldNotReachHere(); // Caller should skip 2nd halves
879 break;
880 case Type::AnyPtr:
881 array->append(new ConstantOopWriteValue(nullptr));
882 break;
883 case Type::AryPtr:
884 case Type::InstPtr: // fall through
885 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding()));
886 break;
887 case Type::NarrowOop:
888 if (t == TypeNarrowOop::NULL_PTR) {
889 array->append(new ConstantOopWriteValue(nullptr));
890 } else {
891 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding()));
892 }
893 break;
894 case Type::Int:
895 array->append(new ConstantIntValue(t->is_int()->get_con()));
896 break;
897 case Type::RawPtr:
898 // A return address (T_ADDRESS).
899 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI");
900 #ifdef _LP64
901 // Must be restored to the full-width 64-bit stack slot.
902 array->append(new ConstantLongValue(t->is_ptr()->get_con()));
903 #else
904 array->append(new ConstantIntValue(t->is_ptr()->get_con()));
905 #endif
906 break;
907 case Type::FloatCon: {
908 float f = t->is_float_constant()->getf();
909 array->append(new ConstantIntValue(jint_cast(f)));
910 break;
911 }
912 case Type::DoubleCon: {
913 jdouble d = t->is_double_constant()->getd();
914 #ifdef _LP64
915 array->append(new ConstantIntValue((jint)0));
916 array->append(new ConstantDoubleValue(d));
917 #else
918 // Repack the double as two jints.
919 // The convention the interpreter uses is that the second local
920 // holds the first raw word of the native double representation.
921 // This is actually reasonable, since locals and stack arrays
922 // grow downwards in all implementations.
923 // (If, on some machine, the interpreter's Java locals or stack
924 // were to grow upwards, the embedded doubles would be word-swapped.)
925 jlong_accessor acc;
926 acc.long_value = jlong_cast(d);
927 array->append(new ConstantIntValue(acc.words[1]));
928 array->append(new ConstantIntValue(acc.words[0]));
929 #endif
930 break;
931 }
932 case Type::Long: {
933 jlong d = t->is_long()->get_con();
934 #ifdef _LP64
935 array->append(new ConstantIntValue((jint)0));
936 array->append(new ConstantLongValue(d));
937 #else
938 // Repack the long as two jints.
939 // The convention the interpreter uses is that the second local
940 // holds the first raw word of the native double representation.
941 // This is actually reasonable, since locals and stack arrays
942 // grow downwards in all implementations.
943 // (If, on some machine, the interpreter's Java locals or stack
944 // were to grow upwards, the embedded doubles would be word-swapped.)
945 jlong_accessor acc;
946 acc.long_value = d;
947 array->append(new ConstantIntValue(acc.words[1]));
948 array->append(new ConstantIntValue(acc.words[0]));
949 #endif
950 break;
951 }
952 case Type::Top: // Add an illegal value here
953 array->append(new LocationValue(Location()));
954 break;
955 default:
956 ShouldNotReachHere();
957 break;
958 }
959 }
960
961 // Determine if this node starts a bundle
962 bool PhaseOutput::starts_bundle(const Node *n) const {
963 return (_node_bundling_limit > n->_idx &&
964 _node_bundling_base[n->_idx].starts_bundle());
965 }
966
967 // Determine if there is a monitor that has 'ov' as its owner.
968 bool PhaseOutput::contains_as_owner(GrowableArray<MonitorValue*> *monarray, ObjectValue *ov) const {
969 for (int k = 0; k < monarray->length(); k++) {
970 MonitorValue* mv = monarray->at(k);
971 if (mv->owner() == ov) {
972 return true;
973 }
974 }
975
976 return false;
977 }
978
979 // Determine if there is a scalar replaced object description represented by 'ov'.
980 bool PhaseOutput::contains_as_scalarized_obj(JVMState* jvms, MachSafePointNode* sfn,
981 GrowableArray<ScopeValue*>* objs,
982 ObjectValue* ov) const {
983 for (int i = 0; i < jvms->scl_size(); i++) {
984 Node* n = sfn->scalarized_obj(jvms, i);
985 // Other kinds of nodes that we may encounter here, for instance constants
986 // representing values of fields of objects scalarized, aren't relevant for
987 // us, since they don't map to ObjectValue.
988 if (!n->is_SafePointScalarObject()) {
989 continue;
990 }
991
992 ObjectValue* other = sv_for_node_id(objs, n->_idx);
993 if (ov == other) {
994 return true;
995 }
996 }
997 return false;
998 }
999
1000 //--------------------------Process_OopMap_Node--------------------------------
1001 void PhaseOutput::Process_OopMap_Node(MachNode *mach, int current_offset) {
1002 // Handle special safepoint nodes for synchronization
1003 MachSafePointNode *sfn = mach->as_MachSafePoint();
1004 MachCallNode *mcall;
1005
1006 int safepoint_pc_offset = current_offset;
1007 bool is_method_handle_invoke = false;
1008 bool return_oop = false;
1009 bool has_ea_local_in_scope = sfn->_has_ea_local_in_scope;
1010 bool arg_escape = false;
1011
1012 // Add the safepoint in the DebugInfoRecorder
1013 if( !mach->is_MachCall() ) {
1014 mcall = nullptr;
1015 C->debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map);
1016 } else {
1017 mcall = mach->as_MachCall();
1018
1019 // Is the call a MethodHandle call?
1020 if (mcall->is_MachCallJava()) {
1021 if (mcall->as_MachCallJava()->_method_handle_invoke) {
1022 assert(C->has_method_handle_invokes(), "must have been set during call generation");
1023 is_method_handle_invoke = true;
1024 }
1025 arg_escape = mcall->as_MachCallJava()->_arg_escape;
1026 }
1027
1028 // Check if a call returns an object.
1029 if (mcall->returns_pointer()) {
1030 return_oop = true;
1031 }
1032 safepoint_pc_offset += mcall->ret_addr_offset();
1033 C->debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map);
1034 }
1035
1036 // Loop over the JVMState list to add scope information
1037 // Do not skip safepoints with a null method, they need monitor info
1038 JVMState* youngest_jvms = sfn->jvms();
1039 int max_depth = youngest_jvms->depth();
1040
1041 // Allocate the object pool for scalar-replaced objects -- the map from
1042 // small-integer keys (which can be recorded in the local and ostack
1043 // arrays) to descriptions of the object state.
1044 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>();
1045
1046 // Visit scopes from oldest to youngest.
1047 for (int depth = 1; depth <= max_depth; depth++) {
1048 JVMState* jvms = youngest_jvms->of_depth(depth);
1049 int idx;
1050 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1051 // Safepoints that do not have method() set only provide oop-map and monitor info
1052 // to support GC; these do not support deoptimization.
1053 int num_locs = (method == nullptr) ? 0 : jvms->loc_size();
1054 int num_exps = (method == nullptr) ? 0 : jvms->stk_size();
1055 int num_mon = jvms->nof_monitors();
1056 assert(method == nullptr || jvms->bci() < 0 || num_locs == method->max_locals(),
1057 "JVMS local count must match that of the method");
1058
1059 // Add Local and Expression Stack Information
1060
1061 // Insert locals into the locarray
1062 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs);
1063 for( idx = 0; idx < num_locs; idx++ ) {
1064 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs );
1065 }
1066
1067 // Insert expression stack entries into the exparray
1068 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps);
1069 for( idx = 0; idx < num_exps; idx++ ) {
1070 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs );
1071 }
1072
1073 // Add in mappings of the monitors
1074 assert( !method ||
1075 !method->is_synchronized() ||
1076 method->is_native() ||
1077 num_mon > 0,
1078 "monitors must always exist for synchronized methods");
1079
1080 // Build the growable array of ScopeValues for exp stack
1081 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
1082
1083 // Loop over monitors and insert into array
1084 for (idx = 0; idx < num_mon; idx++) {
1085 // Grab the node that defines this monitor
1086 Node* box_node = sfn->monitor_box(jvms, idx);
1087 Node* obj_node = sfn->monitor_obj(jvms, idx);
1088
1089 // Create ScopeValue for object
1090 ScopeValue *scval = nullptr;
1091
1092 if (obj_node->is_SafePointScalarObject()) {
1093 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
1094 scval = PhaseOutput::sv_for_node_id(objs, spobj->_idx);
1095 if (scval == nullptr) {
1096 const Type *t = spobj->bottom_type();
1097 ciKlass* cik = t->is_oopptr()->exact_klass();
1098 assert(cik->is_instance_klass() ||
1099 cik->is_array_klass(), "Not supported allocation.");
1100 ObjectValue* sv = new ObjectValue(spobj->_idx,
1101 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
1102 PhaseOutput::set_sv_for_object_node(objs, sv);
1103
1104 uint first_ind = spobj->first_index(youngest_jvms);
1105 for (uint i = 0; i < spobj->n_fields(); i++) {
1106 Node* fld_node = sfn->in(first_ind+i);
1107 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
1108 }
1109 scval = sv;
1110 }
1111 } else if (obj_node->is_SafePointScalarMerge()) {
1112 SafePointScalarMergeNode* smerge = obj_node->as_SafePointScalarMerge();
1113 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
1114
1115 if (mv == nullptr) {
1116 GrowableArray<ScopeValue*> deps;
1117
1118 int merge_pointer_idx = smerge->merge_pointer_idx(youngest_jvms);
1119 FillLocArray(0, sfn, sfn->in(merge_pointer_idx), &deps, objs);
1120 assert(deps.length() == 1, "missing value");
1121
1122 int selector_idx = smerge->selector_idx(youngest_jvms);
1123 FillLocArray(1, nullptr, sfn->in(selector_idx), &deps, nullptr);
1124 assert(deps.length() == 2, "missing value");
1125
1126 mv = new ObjectMergeValue(smerge->_idx, deps.at(0), deps.at(1));
1127 set_sv_for_object_node(objs, mv);
1128
1129 for (uint i = 1; i < smerge->req(); i++) {
1130 Node* obj_node = smerge->in(i);
1131 int idx = mv->possible_objects()->length();
1132 (void)FillLocArray(idx, sfn, obj_node, mv->possible_objects(), objs);
1133
1134 // By default ObjectValues that are in 'possible_objects' are not root objects.
1135 // They will be marked as root later if they are directly referenced in a JVMS.
1136 assert(mv->possible_objects()->length() > idx, "Didn't add entry to possible_objects?!");
1137 assert(mv->possible_objects()->at(idx)->is_object(), "Entries in possible_objects should be ObjectValue.");
1138 mv->possible_objects()->at(idx)->as_ObjectValue()->set_root(false);
1139 }
1140 }
1141 scval = mv;
1142 } else if (!obj_node->is_Con()) {
1143 OptoReg::Name obj_reg = C->regalloc()->get_reg_first(obj_node);
1144 if( obj_node->bottom_type()->base() == Type::NarrowOop ) {
1145 scval = new_loc_value( C->regalloc(), obj_reg, Location::narrowoop );
1146 } else {
1147 scval = new_loc_value( C->regalloc(), obj_reg, Location::oop );
1148 }
1149 } else {
1150 const TypePtr *tp = obj_node->get_ptr_type();
1151 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding());
1152 }
1153
1154 OptoReg::Name box_reg = BoxLockNode::reg(box_node);
1155 Location basic_lock = Location::new_stk_loc(Location::normal,C->regalloc()->reg2offset(box_reg));
1156 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated());
1157 monarray->append(new MonitorValue(scval, basic_lock, eliminated));
1158 }
1159
1160 // Mark ObjectValue nodes as root nodes if they are directly
1161 // referenced in the JVMS.
1162 for (int i = 0; i < objs->length(); i++) {
1163 ScopeValue* sv = objs->at(i);
1164 if (sv->is_object_merge()) {
1165 ObjectMergeValue* merge = sv->as_ObjectMergeValue();
1166
1167 for (int j = 0; j< merge->possible_objects()->length(); j++) {
1168 ObjectValue* ov = merge->possible_objects()->at(j)->as_ObjectValue();
1169 if (ov->is_root()) {
1170 // Already flagged as 'root' by something else. We shouldn't change it
1171 // to non-root in a younger JVMS because it may need to be alive in
1172 // a younger JVMS.
1173 } else {
1174 bool is_root = locarray->contains(ov) ||
1175 exparray->contains(ov) ||
1176 contains_as_owner(monarray, ov) ||
1177 contains_as_scalarized_obj(jvms, sfn, objs, ov);
1178 ov->set_root(is_root);
1179 }
1180 }
1181 }
1182 }
1183
1184 // We dump the object pool first, since deoptimization reads it in first.
1185 C->debug_info()->dump_object_pool(objs);
1186
1187 // Build first class objects to pass to scope
1188 DebugToken *locvals = C->debug_info()->create_scope_values(locarray);
1189 DebugToken *expvals = C->debug_info()->create_scope_values(exparray);
1190 DebugToken *monvals = C->debug_info()->create_monitor_values(monarray);
1191
1192 // Make method available for all Safepoints
1193 ciMethod* scope_method = method ? method : C->method();
1194 // Describe the scope here
1195 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
1196 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
1197 // Now we can describe the scope.
1198 methodHandle null_mh;
1199 bool rethrow_exception = false;
1200 C->debug_info()->describe_scope(
1201 safepoint_pc_offset,
1202 null_mh,
1203 scope_method,
1204 jvms->bci(),
1205 jvms->should_reexecute(),
1206 rethrow_exception,
1207 is_method_handle_invoke,
1208 return_oop,
1209 has_ea_local_in_scope,
1210 arg_escape,
1211 locvals,
1212 expvals,
1213 monvals
1214 );
1215 } // End jvms loop
1216
1217 // Mark the end of the scope set.
1218 C->debug_info()->end_safepoint(safepoint_pc_offset);
1219 }
1220
1221
1222
1223 // A simplified version of Process_OopMap_Node, to handle non-safepoints.
1224 class NonSafepointEmitter {
1225 Compile* C;
1226 JVMState* _pending_jvms;
1227 int _pending_offset;
1228
1229 void emit_non_safepoint();
1230
1231 public:
1232 NonSafepointEmitter(Compile* compile) {
1233 this->C = compile;
1234 _pending_jvms = nullptr;
1235 _pending_offset = 0;
1236 }
1237
1238 void observe_instruction(Node* n, int pc_offset) {
1239 if (!C->debug_info()->recording_non_safepoints()) return;
1240
1241 Node_Notes* nn = C->node_notes_at(n->_idx);
1242 if (nn == nullptr || nn->jvms() == nullptr) return;
1243 if (_pending_jvms != nullptr &&
1244 _pending_jvms->same_calls_as(nn->jvms())) {
1245 // Repeated JVMS? Stretch it up here.
1246 _pending_offset = pc_offset;
1247 } else {
1248 if (_pending_jvms != nullptr &&
1249 _pending_offset < pc_offset) {
1250 emit_non_safepoint();
1251 }
1252 _pending_jvms = nullptr;
1253 if (pc_offset > C->debug_info()->last_pc_offset()) {
1254 // This is the only way _pending_jvms can become non-null:
1255 _pending_jvms = nn->jvms();
1256 _pending_offset = pc_offset;
1257 }
1258 }
1259 }
1260
1261 // Stay out of the way of real safepoints:
1262 void observe_safepoint(JVMState* jvms, int pc_offset) {
1263 if (_pending_jvms != nullptr &&
1264 !_pending_jvms->same_calls_as(jvms) &&
1265 _pending_offset < pc_offset) {
1266 emit_non_safepoint();
1267 }
1268 _pending_jvms = nullptr;
1269 }
1270
1271 void flush_at_end() {
1272 if (_pending_jvms != nullptr) {
1273 emit_non_safepoint();
1274 }
1275 _pending_jvms = nullptr;
1276 }
1277 };
1278
1279 void NonSafepointEmitter::emit_non_safepoint() {
1280 JVMState* youngest_jvms = _pending_jvms;
1281 int pc_offset = _pending_offset;
1282
1283 // Clear it now:
1284 _pending_jvms = nullptr;
1285
1286 DebugInformationRecorder* debug_info = C->debug_info();
1287 assert(debug_info->recording_non_safepoints(), "sanity");
1288
1289 debug_info->add_non_safepoint(pc_offset);
1290 int max_depth = youngest_jvms->depth();
1291
1292 // Visit scopes from oldest to youngest.
1293 for (int depth = 1; depth <= max_depth; depth++) {
1294 JVMState* jvms = youngest_jvms->of_depth(depth);
1295 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1296 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest");
1297 methodHandle null_mh;
1298 debug_info->describe_scope(pc_offset, null_mh, method, jvms->bci(), jvms->should_reexecute());
1299 }
1300
1301 // Mark the end of the scope set.
1302 debug_info->end_non_safepoint(pc_offset);
1303 }
1304
1305 //------------------------------init_buffer------------------------------------
1306 void PhaseOutput::estimate_buffer_size(int& const_req) {
1307
1308 // Set the initially allocated size
1309 const_req = initial_const_capacity;
1310
1311 // The extra spacing after the code is necessary on some platforms.
1312 // Sometimes we need to patch in a jump after the last instruction,
1313 // if the nmethod has been deoptimized. (See 4932387, 4894843.)
1314
1315 // Compute the byte offset where we can store the deopt pc.
1316 if (C->fixed_slots() != 0) {
1317 _orig_pc_slot_offset_in_bytes = C->regalloc()->reg2offset(OptoReg::stack2reg(_orig_pc_slot));
1318 }
1319
1320 // Compute prolog code size
1321 _frame_slots = OptoReg::reg2stack(C->matcher()->_old_SP) + C->regalloc()->_framesize;
1322 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check");
1323
1324 if (C->has_mach_constant_base_node()) {
1325 uint add_size = 0;
1326 // Fill the constant table.
1327 // Note: This must happen before shorten_branches.
1328 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1329 Block* b = C->cfg()->get_block(i);
1330
1331 for (uint j = 0; j < b->number_of_nodes(); j++) {
1332 Node* n = b->get_node(j);
1333
1334 // If the node is a MachConstantNode evaluate the constant
1335 // value section.
1336 if (n->is_MachConstant()) {
1337 MachConstantNode* machcon = n->as_MachConstant();
1338 machcon->eval_constant(C);
1339 } else if (n->is_Mach()) {
1340 // On Power there are more nodes that issue constants.
1341 add_size += (n->as_Mach()->ins_num_consts() * 8);
1342 }
1343 }
1344 }
1345
1346 // Calculate the offsets of the constants and the size of the
1347 // constant table (including the padding to the next section).
1348 constant_table().calculate_offsets_and_size();
1349 const_req = constant_table().alignment() + constant_table().size() + add_size;
1350 }
1351
1352 // Initialize the space for the BufferBlob used to find and verify
1353 // instruction size in MachNode::emit_size()
1354 init_scratch_buffer_blob(const_req);
1355 }
1356
1357 CodeBuffer* PhaseOutput::init_buffer() {
1358 int stub_req = _buf_sizes._stub;
1359 int code_req = _buf_sizes._code;
1360 int const_req = _buf_sizes._const;
1361
1362 int pad_req = NativeCall::byte_size();
1363
1364 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1365 stub_req += bs->estimate_stub_size();
1366
1367 // nmethod and CodeBuffer count stubs & constants as part of method's code.
1368 // class HandlerImpl is platform-specific and defined in the *.ad files.
1369 int exception_handler_req = HandlerImpl::size_exception_handler() + MAX_stubs_size; // add marginal slop for handler
1370 int deopt_handler_req = HandlerImpl::size_deopt_handler() + MAX_stubs_size; // add marginal slop for handler
1371 stub_req += MAX_stubs_size; // ensure per-stub margin
1372 code_req += max_inst_size(); // ensure per-instruction margin
1373
1374 if (StressCodeBuffers)
1375 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion
1376
1377 int total_req =
1378 const_req +
1379 code_req +
1380 pad_req +
1381 stub_req +
1382 exception_handler_req +
1383 deopt_handler_req; // deopt handler
1384
1385 if (C->has_method_handle_invokes())
1386 total_req += deopt_handler_req; // deopt MH handler
1387
1388 CodeBuffer* cb = code_buffer();
1389 cb->set_const_section_alignment(constant_table().alignment());
1390 cb->initialize(total_req, _buf_sizes._reloc);
1391
1392 // Have we run out of code space?
1393 if ((cb->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1394 C->record_failure("CodeCache is full");
1395 return nullptr;
1396 }
1397 // Configure the code buffer.
1398 cb->initialize_consts_size(const_req);
1399 cb->initialize_stubs_size(stub_req);
1400 cb->initialize_oop_recorder(C->env()->oop_recorder());
1401
1402 // fill in the nop array for bundling computations
1403 MachNode *_nop_list[Bundle::_nop_count];
1404 Bundle::initialize_nops(_nop_list);
1405
1406 return cb;
1407 }
1408
1409 //------------------------------fill_buffer------------------------------------
1410 void PhaseOutput::fill_buffer(C2_MacroAssembler* masm, uint* blk_starts) {
1411 // blk_starts[] contains offsets calculated during short branches processing,
1412 // offsets should not be increased during following steps.
1413
1414 // Compute the size of first NumberOfLoopInstrToAlign instructions at head
1415 // of a loop. It is used to determine the padding for loop alignment.
1416 Compile::TracePhase tp(_t_fillBuffer);
1417
1418 compute_loop_first_inst_sizes();
1419
1420 // Create oopmap set.
1421 _oop_map_set = new OopMapSet();
1422
1423 // !!!!! This preserves old handling of oopmaps for now
1424 C->debug_info()->set_oopmaps(_oop_map_set);
1425
1426 uint nblocks = C->cfg()->number_of_blocks();
1427 // Count and start of implicit null check instructions
1428 uint inct_cnt = 0;
1429 uint* inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1430
1431 // Count and start of calls
1432 uint* call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1433
1434 uint return_offset = 0;
1435 int nop_size = (new MachNopNode())->size(C->regalloc());
1436
1437 int previous_offset = 0;
1438 int current_offset = 0;
1439 int last_call_offset = -1;
1440 int last_avoid_back_to_back_offset = -1;
1441 #ifdef ASSERT
1442 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks);
1443 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
1444 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
1445 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks);
1446 #endif
1447
1448 // Create an array of unused labels, one for each basic block, if printing is enabled
1449 #if defined(SUPPORT_OPTO_ASSEMBLY)
1450 int* node_offsets = nullptr;
1451 uint node_offset_limit = C->unique();
1452
1453 if (C->print_assembly()) {
1454 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit);
1455 }
1456 if (node_offsets != nullptr) {
1457 // We need to initialize. Unused array elements may contain garbage and mess up PrintOptoAssembly.
1458 memset(node_offsets, 0, node_offset_limit*sizeof(int));
1459 }
1460 #endif
1461
1462 NonSafepointEmitter non_safepoints(C); // emit non-safepoints lazily
1463
1464 // Emit the constant table.
1465 if (C->has_mach_constant_base_node()) {
1466 if (!constant_table().emit(masm)) {
1467 C->record_failure("consts section overflow");
1468 return;
1469 }
1470 }
1471
1472 // Create an array of labels, one for each basic block
1473 Label* blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1);
1474 for (uint i = 0; i <= nblocks; i++) {
1475 blk_labels[i].init();
1476 }
1477
1478 // Now fill in the code buffer
1479 Node* delay_slot = nullptr;
1480 for (uint i = 0; i < nblocks; i++) {
1481 Block* block = C->cfg()->get_block(i);
1482 _block = block;
1483 Node* head = block->head();
1484
1485 // If this block needs to start aligned (i.e, can be reached other
1486 // than by falling-thru from the previous block), then force the
1487 // start of a new bundle.
1488 if (Pipeline::requires_bundling() && starts_bundle(head)) {
1489 masm->code()->flush_bundle(true);
1490 }
1491
1492 #ifdef ASSERT
1493 if (!block->is_connector()) {
1494 stringStream st;
1495 block->dump_head(C->cfg(), &st);
1496 masm->block_comment(st.freeze());
1497 }
1498 jmp_target[i] = 0;
1499 jmp_offset[i] = 0;
1500 jmp_size[i] = 0;
1501 jmp_rule[i] = 0;
1502 #endif
1503 int blk_offset = current_offset;
1504
1505 // Define the label at the beginning of the basic block
1506 masm->bind(blk_labels[block->_pre_order]);
1507
1508 uint last_inst = block->number_of_nodes();
1509
1510 // Emit block normally, except for last instruction.
1511 // Emit means "dump code bits into code buffer".
1512 for (uint j = 0; j<last_inst; j++) {
1513 _index = j;
1514
1515 // Get the node
1516 Node* n = block->get_node(j);
1517
1518 // See if delay slots are supported
1519 if (valid_bundle_info(n) && node_bundling(n)->used_in_unconditional_delay()) {
1520 assert(delay_slot == nullptr, "no use of delay slot node");
1521 assert(n->size(C->regalloc()) == Pipeline::instr_unit_size(), "delay slot instruction wrong size");
1522
1523 delay_slot = n;
1524 continue;
1525 }
1526
1527 // If this starts a new instruction group, then flush the current one
1528 // (but allow split bundles)
1529 if (Pipeline::requires_bundling() && starts_bundle(n))
1530 masm->code()->flush_bundle(false);
1531
1532 // Special handling for SafePoint/Call Nodes
1533 bool is_mcall = false;
1534 if (n->is_Mach()) {
1535 MachNode *mach = n->as_Mach();
1536 is_mcall = n->is_MachCall();
1537 bool is_sfn = n->is_MachSafePoint();
1538
1539 // If this requires all previous instructions be flushed, then do so
1540 if (is_sfn || is_mcall || mach->alignment_required() != 1) {
1541 masm->code()->flush_bundle(true);
1542 current_offset = masm->offset();
1543 }
1544
1545 // A padding may be needed again since a previous instruction
1546 // could be moved to delay slot.
1547
1548 // align the instruction if necessary
1549 int padding = mach->compute_padding(current_offset);
1550 // Make sure safepoint node for polling is distinct from a call's
1551 // return by adding a nop if needed.
1552 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) {
1553 padding = nop_size;
1554 }
1555 if (padding == 0 && mach->avoid_back_to_back(MachNode::AVOID_BEFORE) &&
1556 current_offset == last_avoid_back_to_back_offset) {
1557 // Avoid back to back some instructions.
1558 padding = nop_size;
1559 }
1560
1561 if (padding > 0) {
1562 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size");
1563 int nops_cnt = padding / nop_size;
1564 MachNode *nop = new MachNopNode(nops_cnt);
1565 block->insert_node(nop, j++);
1566 last_inst++;
1567 C->cfg()->map_node_to_block(nop, block);
1568 // Ensure enough space.
1569 masm->code()->insts()->maybe_expand_to_ensure_remaining(max_inst_size());
1570 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1571 C->record_failure("CodeCache is full");
1572 return;
1573 }
1574 nop->emit(masm, C->regalloc());
1575 masm->code()->flush_bundle(true);
1576 current_offset = masm->offset();
1577 }
1578
1579 bool observe_safepoint = is_sfn;
1580 // Remember the start of the last call in a basic block
1581 if (is_mcall) {
1582 MachCallNode *mcall = mach->as_MachCall();
1583
1584 // This destination address is NOT PC-relative
1585 mcall->method_set((intptr_t)mcall->entry_point());
1586
1587 // Save the return address
1588 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset();
1589
1590 observe_safepoint = mcall->guaranteed_safepoint();
1591 }
1592
1593 // sfn will be valid whenever mcall is valid now because of inheritance
1594 if (observe_safepoint) {
1595 // Handle special safepoint nodes for synchronization
1596 if (!is_mcall) {
1597 MachSafePointNode *sfn = mach->as_MachSafePoint();
1598 // !!!!! Stubs only need an oopmap right now, so bail out
1599 if (sfn->jvms()->method() == nullptr) {
1600 // Write the oopmap directly to the code blob??!!
1601 continue;
1602 }
1603 } // End synchronization
1604
1605 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1606 current_offset);
1607 Process_OopMap_Node(mach, current_offset);
1608 } // End if safepoint
1609
1610 // If this is a null check, then add the start of the previous instruction to the list
1611 else if( mach->is_MachNullCheck() ) {
1612 inct_starts[inct_cnt++] = previous_offset;
1613 }
1614
1615 // If this is a branch, then fill in the label with the target BB's label
1616 else if (mach->is_MachBranch()) {
1617 // This requires the TRUE branch target be in succs[0]
1618 uint block_num = block->non_connector_successor(0)->_pre_order;
1619
1620 // Try to replace long branch if delay slot is not used,
1621 // it is mostly for back branches since forward branch's
1622 // distance is not updated yet.
1623 bool delay_slot_is_used = valid_bundle_info(n) &&
1624 C->output()->node_bundling(n)->use_unconditional_delay();
1625 if (!delay_slot_is_used && mach->may_be_short_branch()) {
1626 assert(delay_slot == nullptr, "not expecting delay slot node");
1627 int br_size = n->size(C->regalloc());
1628 int offset = blk_starts[block_num] - current_offset;
1629 if (block_num >= i) {
1630 // Current and following block's offset are not
1631 // finalized yet, adjust distance by the difference
1632 // between calculated and final offsets of current block.
1633 offset -= (blk_starts[i] - blk_offset);
1634 }
1635 // In the following code a nop could be inserted before
1636 // the branch which will increase the backward distance.
1637 bool needs_padding = (current_offset == last_avoid_back_to_back_offset);
1638 if (needs_padding && offset <= 0)
1639 offset -= nop_size;
1640
1641 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
1642 // We've got a winner. Replace this branch.
1643 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
1644
1645 // Update the jmp_size.
1646 int new_size = replacement->size(C->regalloc());
1647 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller");
1648 // Insert padding between avoid_back_to_back branches.
1649 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
1650 MachNode *nop = new MachNopNode();
1651 block->insert_node(nop, j++);
1652 C->cfg()->map_node_to_block(nop, block);
1653 last_inst++;
1654 nop->emit(masm, C->regalloc());
1655 masm->code()->flush_bundle(true);
1656 current_offset = masm->offset();
1657 }
1658 #ifdef ASSERT
1659 jmp_target[i] = block_num;
1660 jmp_offset[i] = current_offset - blk_offset;
1661 jmp_size[i] = new_size;
1662 jmp_rule[i] = mach->rule();
1663 #endif
1664 block->map_node(replacement, j);
1665 mach->subsume_by(replacement, C);
1666 n = replacement;
1667 mach = replacement;
1668 }
1669 }
1670 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num );
1671 } else if (mach->ideal_Opcode() == Op_Jump) {
1672 for (uint h = 0; h < block->_num_succs; h++) {
1673 Block* succs_block = block->_succs[h];
1674 for (uint j = 1; j < succs_block->num_preds(); j++) {
1675 Node* jpn = succs_block->pred(j);
1676 if (jpn->is_JumpProj() && jpn->in(0) == mach) {
1677 uint block_num = succs_block->non_connector()->_pre_order;
1678 Label *blkLabel = &blk_labels[block_num];
1679 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel);
1680 }
1681 }
1682 }
1683 } else if (!n->is_Proj()) {
1684 // Remember the beginning of the previous instruction, in case
1685 // it's followed by a flag-kill and a null-check. Happens on
1686 // Intel all the time, with add-to-memory kind of opcodes.
1687 previous_offset = current_offset;
1688 }
1689
1690 // Not an else-if!
1691 // If this is a trap based cmp then add its offset to the list.
1692 if (mach->is_TrapBasedCheckNode()) {
1693 inct_starts[inct_cnt++] = current_offset;
1694 }
1695 }
1696
1697 // Verify that there is sufficient space remaining
1698 masm->code()->insts()->maybe_expand_to_ensure_remaining(max_inst_size());
1699 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1700 C->record_failure("CodeCache is full");
1701 return;
1702 }
1703
1704 // Save the offset for the listing
1705 #if defined(SUPPORT_OPTO_ASSEMBLY)
1706 if ((node_offsets != nullptr) && (n->_idx < node_offset_limit)) {
1707 node_offsets[n->_idx] = masm->offset();
1708 }
1709 #endif
1710 assert(!C->failing_internal() || C->failure_is_artificial(), "Should not reach here if failing.");
1711
1712 // "Normal" instruction case
1713 DEBUG_ONLY(uint instr_offset = masm->offset());
1714 n->emit(masm, C->regalloc());
1715 current_offset = masm->offset();
1716
1717 // Above we only verified that there is enough space in the instruction section.
1718 // However, the instruction may emit stubs that cause code buffer expansion.
1719 // Bail out here if expansion failed due to a lack of code cache space.
1720 if (C->failing()) {
1721 return;
1722 }
1723
1724 assert(!is_mcall || (call_returns[block->_pre_order] <= (uint)current_offset),
1725 "ret_addr_offset() not within emitted code");
1726
1727 #ifdef ASSERT
1728 uint n_size = n->size(C->regalloc());
1729 if (n_size < (current_offset-instr_offset)) {
1730 MachNode* mach = n->as_Mach();
1731 n->dump();
1732 mach->dump_format(C->regalloc(), tty);
1733 tty->print_cr(" n_size (%d), current_offset (%d), instr_offset (%d)", n_size, current_offset, instr_offset);
1734 Disassembler::decode(masm->code()->insts_begin() + instr_offset, masm->code()->insts_begin() + current_offset + 1, tty);
1735 tty->print_cr(" ------------------- ");
1736 BufferBlob* blob = this->scratch_buffer_blob();
1737 address blob_begin = blob->content_begin();
1738 Disassembler::decode(blob_begin, blob_begin + n_size + 1, tty);
1739 assert(false, "wrong size of mach node");
1740 }
1741 #endif
1742 non_safepoints.observe_instruction(n, current_offset);
1743
1744 // mcall is last "call" that can be a safepoint
1745 // record it so we can see if a poll will directly follow it
1746 // in which case we'll need a pad to make the PcDesc sites unique
1747 // see 5010568. This can be slightly inaccurate but conservative
1748 // in the case that return address is not actually at current_offset.
1749 // This is a small price to pay.
1750
1751 if (is_mcall) {
1752 last_call_offset = current_offset;
1753 }
1754
1755 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
1756 // Avoid back to back some instructions.
1757 last_avoid_back_to_back_offset = current_offset;
1758 }
1759
1760 // See if this instruction has a delay slot
1761 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
1762 guarantee(delay_slot != nullptr, "expecting delay slot node");
1763
1764 // Back up 1 instruction
1765 masm->code()->set_insts_end(masm->code()->insts_end() - Pipeline::instr_unit_size());
1766
1767 // Save the offset for the listing
1768 #if defined(SUPPORT_OPTO_ASSEMBLY)
1769 if ((node_offsets != nullptr) && (delay_slot->_idx < node_offset_limit)) {
1770 node_offsets[delay_slot->_idx] = masm->offset();
1771 }
1772 #endif
1773
1774 // Support a SafePoint in the delay slot
1775 if (delay_slot->is_MachSafePoint()) {
1776 MachNode *mach = delay_slot->as_Mach();
1777 // !!!!! Stubs only need an oopmap right now, so bail out
1778 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == nullptr) {
1779 // Write the oopmap directly to the code blob??!!
1780 delay_slot = nullptr;
1781 continue;
1782 }
1783
1784 int adjusted_offset = current_offset - Pipeline::instr_unit_size();
1785 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1786 adjusted_offset);
1787 // Generate an OopMap entry
1788 Process_OopMap_Node(mach, adjusted_offset);
1789 }
1790
1791 // Insert the delay slot instruction
1792 delay_slot->emit(masm, C->regalloc());
1793
1794 // Don't reuse it
1795 delay_slot = nullptr;
1796 }
1797
1798 } // End for all instructions in block
1799
1800 // If the next block is the top of a loop, pad this block out to align
1801 // the loop top a little. Helps prevent pipe stalls at loop back branches.
1802 if (i < nblocks-1) {
1803 Block *nb = C->cfg()->get_block(i + 1);
1804 int padding = nb->alignment_padding(current_offset);
1805 if( padding > 0 ) {
1806 MachNode *nop = new MachNopNode(padding / nop_size);
1807 block->insert_node(nop, block->number_of_nodes());
1808 C->cfg()->map_node_to_block(nop, block);
1809 nop->emit(masm, C->regalloc());
1810 current_offset = masm->offset();
1811 }
1812 }
1813 // Verify that the distance for generated before forward
1814 // short branches is still valid.
1815 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size");
1816
1817 // Save new block start offset
1818 blk_starts[i] = blk_offset;
1819 } // End of for all blocks
1820 blk_starts[nblocks] = current_offset;
1821
1822 non_safepoints.flush_at_end();
1823
1824 // Offset too large?
1825 if (C->failing()) return;
1826
1827 // Define a pseudo-label at the end of the code
1828 masm->bind( blk_labels[nblocks] );
1829
1830 // Compute the size of the first block
1831 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos();
1832
1833 #ifdef ASSERT
1834 for (uint i = 0; i < nblocks; i++) { // For all blocks
1835 if (jmp_target[i] != 0) {
1836 int br_size = jmp_size[i];
1837 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
1838 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
1839 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]);
1840 assert(false, "Displacement too large for short jmp");
1841 }
1842 }
1843 }
1844 #endif
1845
1846 if (!masm->code()->finalize_stubs()) {
1847 C->record_failure("CodeCache is full");
1848 return;
1849 }
1850
1851 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1852 bs->emit_stubs(*masm->code());
1853 if (C->failing()) return;
1854
1855 // Fill in stubs.
1856 assert(masm->inst_mark() == nullptr, "should be.");
1857 _stub_list.emit(*masm);
1858 if (C->failing()) return;
1859
1860 #ifndef PRODUCT
1861 // Information on the size of the method, without the extraneous code
1862 Scheduling::increment_method_size(masm->offset());
1863 #endif
1864
1865 // ------------------
1866 // Fill in exception table entries.
1867 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels);
1868
1869 // Only java methods have exception handlers and deopt handlers
1870 // class HandlerImpl is platform-specific and defined in the *.ad files.
1871 if (C->method()) {
1872 // Emit the exception handler code.
1873 _code_offsets.set_value(CodeOffsets::Exceptions, HandlerImpl::emit_exception_handler(masm));
1874 if (C->failing()) {
1875 return; // CodeBuffer::expand failed
1876 }
1877 // Emit the deopt handler code.
1878 _code_offsets.set_value(CodeOffsets::Deopt, HandlerImpl::emit_deopt_handler(masm));
1879
1880 // Emit the MethodHandle deopt handler code (if required).
1881 if (C->has_method_handle_invokes() && !C->failing()) {
1882 // We can use the same code as for the normal deopt handler, we
1883 // just need a different entry point address.
1884 _code_offsets.set_value(CodeOffsets::DeoptMH, HandlerImpl::emit_deopt_handler(masm));
1885 }
1886 }
1887
1888 // One last check for failed CodeBuffer::expand:
1889 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1890 C->record_failure("CodeCache is full");
1891 return;
1892 }
1893
1894 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) || defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_OPTO_ASSEMBLY)
1895 if (C->print_assembly()) {
1896 tty->cr();
1897 tty->print_cr("============================= C2-compiled nmethod ==============================");
1898 }
1899 #endif
1900
1901 #if defined(SUPPORT_OPTO_ASSEMBLY)
1902 // Dump the assembly code, including basic-block numbers
1903 if (C->print_assembly()) {
1904 ttyLocker ttyl; // keep the following output all in one block
1905 if (!VMThread::should_terminate()) { // test this under the tty lock
1906 // print_metadata and dump_asm may safepoint which makes us loose the ttylock.
1907 // We call them first and write to a stringStream, then we retake the lock to
1908 // make sure the end tag is coherent, and that xmlStream->pop_tag is done thread safe.
1909 ResourceMark rm;
1910 stringStream method_metadata_str;
1911 if (C->method() != nullptr) {
1912 C->method()->print_metadata(&method_metadata_str);
1913 }
1914 stringStream dump_asm_str;
1915 dump_asm_on(&dump_asm_str, node_offsets, node_offset_limit);
1916
1917 NoSafepointVerifier nsv;
1918 ttyLocker ttyl2;
1919 // This output goes directly to the tty, not the compiler log.
1920 // To enable tools to match it up with the compilation activity,
1921 // be sure to tag this tty output with the compile ID.
1922 if (xtty != nullptr) {
1923 xtty->head("opto_assembly compile_id='%d'%s", C->compile_id(),
1924 C->is_osr_compilation() ? " compile_kind='osr'" :
1925 (C->for_preload() ? " compile_kind='AP'" : ""));
1926 }
1927 if (C->method() != nullptr) {
1928 tty->print_cr("----------------------- MetaData before Compile_id = %d ------------------------", C->compile_id());
1929 tty->print_raw(method_metadata_str.freeze());
1930 } else if (C->stub_name() != nullptr) {
1931 tty->print_cr("----------------------------- RuntimeStub %s -------------------------------", C->stub_name());
1932 }
1933 tty->cr();
1934 tty->print_cr("------------------------ OptoAssembly for Compile_id = %d -----------------------", C->compile_id());
1935 tty->print_raw(dump_asm_str.freeze());
1936 tty->print_cr("--------------------------------------------------------------------------------");
1937 if (xtty != nullptr) {
1938 xtty->tail("opto_assembly");
1939 }
1940 }
1941 }
1942 #endif
1943 }
1944
1945 void PhaseOutput::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) {
1946 _inc_table.set_size(cnt);
1947
1948 uint inct_cnt = 0;
1949 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1950 Block* block = C->cfg()->get_block(i);
1951 Node *n = nullptr;
1952 int j;
1953
1954 // Find the branch; ignore trailing NOPs.
1955 for (j = block->number_of_nodes() - 1; j >= 0; j--) {
1956 n = block->get_node(j);
1957 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) {
1958 break;
1959 }
1960 }
1961
1962 // If we didn't find anything, continue
1963 if (j < 0) {
1964 continue;
1965 }
1966
1967 // Compute ExceptionHandlerTable subtable entry and add it
1968 // (skip empty blocks)
1969 if (n->is_Catch()) {
1970
1971 // Get the offset of the return from the call
1972 uint call_return = call_returns[block->_pre_order];
1973 #ifdef ASSERT
1974 assert( call_return > 0, "no call seen for this basic block" );
1975 while (block->get_node(--j)->is_MachProj()) ;
1976 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call");
1977 #endif
1978 // last instruction is a CatchNode, find it's CatchProjNodes
1979 int nof_succs = block->_num_succs;
1980 // allocate space
1981 GrowableArray<intptr_t> handler_bcis(nof_succs);
1982 GrowableArray<intptr_t> handler_pcos(nof_succs);
1983 // iterate through all successors
1984 for (int j = 0; j < nof_succs; j++) {
1985 Block* s = block->_succs[j];
1986 bool found_p = false;
1987 for (uint k = 1; k < s->num_preds(); k++) {
1988 Node* pk = s->pred(k);
1989 if (pk->is_CatchProj() && pk->in(0) == n) {
1990 const CatchProjNode* p = pk->as_CatchProj();
1991 found_p = true;
1992 // add the corresponding handler bci & pco information
1993 if (p->_con != CatchProjNode::fall_through_index) {
1994 // p leads to an exception handler (and is not fall through)
1995 assert(s == C->cfg()->get_block(s->_pre_order), "bad numbering");
1996 // no duplicates, please
1997 if (!handler_bcis.contains(p->handler_bci())) {
1998 uint block_num = s->non_connector()->_pre_order;
1999 handler_bcis.append(p->handler_bci());
2000 handler_pcos.append(blk_labels[block_num].loc_pos());
2001 }
2002 }
2003 }
2004 }
2005 assert(found_p, "no matching predecessor found");
2006 // Note: Due to empty block removal, one block may have
2007 // several CatchProj inputs, from the same Catch.
2008 }
2009
2010 // Set the offset of the return from the call
2011 assert(handler_bcis.find(-1) != -1, "must have default handler");
2012 _handler_table.add_subtable(call_return, &handler_bcis, nullptr, &handler_pcos);
2013 continue;
2014 }
2015
2016 // Handle implicit null exception table updates
2017 if (n->is_MachNullCheck()) {
2018 MachNode* access = n->in(1)->as_Mach();
2019 assert(access->barrier_data() == 0 ||
2020 access->is_late_expanded_null_check_candidate(),
2021 "Implicit null checks on memory accesses with barriers are only supported on nodes explicitly marked as null-check candidates");
2022 uint block_num = block->non_connector_successor(0)->_pre_order;
2023 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2024 continue;
2025 }
2026 // Handle implicit exception table updates: trap instructions.
2027 if (n->is_Mach() && n->as_Mach()->is_TrapBasedCheckNode()) {
2028 uint block_num = block->non_connector_successor(0)->_pre_order;
2029 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2030 continue;
2031 }
2032 } // End of for all blocks fill in exception table entries
2033 }
2034
2035 // Static Variables
2036 #ifndef PRODUCT
2037 uint Scheduling::_total_nop_size = 0;
2038 uint Scheduling::_total_method_size = 0;
2039 uint Scheduling::_total_branches = 0;
2040 uint Scheduling::_total_unconditional_delays = 0;
2041 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
2042 #endif
2043
2044 // Initializer for class Scheduling
2045
2046 Scheduling::Scheduling(Arena *arena, Compile &compile)
2047 : _arena(arena),
2048 _cfg(compile.cfg()),
2049 _regalloc(compile.regalloc()),
2050 _scheduled(arena),
2051 _available(arena),
2052 _reg_node(arena),
2053 _pinch_free_list(arena),
2054 _next_node(nullptr),
2055 _bundle_instr_count(0),
2056 _bundle_cycle_number(0),
2057 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0])
2058 #ifndef PRODUCT
2059 , _branches(0)
2060 , _unconditional_delays(0)
2061 #endif
2062 {
2063 // Create a MachNopNode
2064 _nop = new MachNopNode();
2065
2066 // Now that the nops are in the array, save the count
2067 // (but allow entries for the nops)
2068 _node_bundling_limit = compile.unique();
2069 uint node_max = _regalloc->node_regs_max_index();
2070
2071 compile.output()->set_node_bundling_limit(_node_bundling_limit);
2072
2073 // This one is persistent within the Compile class
2074 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max);
2075
2076 // Allocate space for fixed-size arrays
2077 _uses = NEW_ARENA_ARRAY(arena, short, node_max);
2078 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
2079
2080 // Clear the arrays
2081 for (uint i = 0; i < node_max; i++) {
2082 ::new (&_node_bundling_base[i]) Bundle();
2083 }
2084 memset(_uses, 0, node_max * sizeof(short));
2085 memset(_current_latency, 0, node_max * sizeof(unsigned short));
2086
2087 // Clear the bundling information
2088 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements));
2089
2090 // Get the last node
2091 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1);
2092
2093 _next_node = block->get_node(block->number_of_nodes() - 1);
2094 }
2095
2096 #ifndef PRODUCT
2097 // Scheduling destructor
2098 Scheduling::~Scheduling() {
2099 _total_branches += _branches;
2100 _total_unconditional_delays += _unconditional_delays;
2101 }
2102 #endif
2103
2104 // Step ahead "i" cycles
2105 void Scheduling::step(uint i) {
2106
2107 Bundle *bundle = node_bundling(_next_node);
2108 bundle->set_starts_bundle();
2109
2110 // Update the bundle record, but leave the flags information alone
2111 if (_bundle_instr_count > 0) {
2112 bundle->set_instr_count(_bundle_instr_count);
2113 bundle->set_resources_used(_bundle_use.resourcesUsed());
2114 }
2115
2116 // Update the state information
2117 _bundle_instr_count = 0;
2118 _bundle_cycle_number += i;
2119 _bundle_use.step(i);
2120 }
2121
2122 void Scheduling::step_and_clear() {
2123 Bundle *bundle = node_bundling(_next_node);
2124 bundle->set_starts_bundle();
2125
2126 // Update the bundle record
2127 if (_bundle_instr_count > 0) {
2128 bundle->set_instr_count(_bundle_instr_count);
2129 bundle->set_resources_used(_bundle_use.resourcesUsed());
2130
2131 _bundle_cycle_number += 1;
2132 }
2133
2134 // Clear the bundling information
2135 _bundle_instr_count = 0;
2136 _bundle_use.reset();
2137
2138 memcpy(_bundle_use_elements,
2139 Pipeline_Use::elaborated_elements,
2140 sizeof(Pipeline_Use::elaborated_elements));
2141 }
2142
2143 // Perform instruction scheduling and bundling over the sequence of
2144 // instructions in backwards order.
2145 void PhaseOutput::ScheduleAndBundle() {
2146
2147 // Don't optimize this if it isn't a method
2148 if (!C->method())
2149 return;
2150
2151 // Don't optimize this if scheduling is disabled
2152 if (!C->do_scheduling())
2153 return;
2154
2155 // Scheduling code works only with pairs (8 bytes) maximum.
2156 // And when the scalable vector register is used, we may spill/unspill
2157 // the whole reg regardless of the max vector size.
2158 if (C->max_vector_size() > 8 ||
2159 (C->max_vector_size() > 0 && Matcher::supports_scalable_vector())) {
2160 return;
2161 }
2162
2163 Compile::TracePhase tp(_t_instrSched);
2164
2165 // Create a data structure for all the scheduling information
2166 Scheduling scheduling(Thread::current()->resource_area(), *C);
2167
2168 // Walk backwards over each basic block, computing the needed alignment
2169 // Walk over all the basic blocks
2170 scheduling.DoScheduling();
2171
2172 #ifndef PRODUCT
2173 if (C->trace_opto_output()) {
2174 // Buffer and print all at once
2175 ResourceMark rm;
2176 stringStream ss;
2177 ss.print("\n---- After ScheduleAndBundle ----\n");
2178 print_scheduling(&ss);
2179 tty->print("%s", ss.as_string());
2180 }
2181 #endif
2182 }
2183
2184 #ifndef PRODUCT
2185 // Separated out so that it can be called directly from debugger
2186 void PhaseOutput::print_scheduling() {
2187 print_scheduling(tty);
2188 }
2189
2190 void PhaseOutput::print_scheduling(outputStream* output_stream) {
2191 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
2192 output_stream->print("\nBB#%03d:\n", i);
2193 Block* block = C->cfg()->get_block(i);
2194 for (uint j = 0; j < block->number_of_nodes(); j++) {
2195 Node* n = block->get_node(j);
2196 OptoReg::Name reg = C->regalloc()->get_reg_first(n);
2197 output_stream->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : "");
2198 n->dump("\n", false, output_stream);
2199 }
2200 }
2201 }
2202 #endif
2203
2204 // See if this node fits into the present instruction bundle
2205 bool Scheduling::NodeFitsInBundle(Node *n) {
2206 uint n_idx = n->_idx;
2207
2208 // If this is the unconditional delay instruction, then it fits
2209 if (n == _unconditional_delay_slot) {
2210 #ifndef PRODUCT
2211 if (_cfg->C->trace_opto_output())
2212 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx);
2213 #endif
2214 return (true);
2215 }
2216
2217 // If the node cannot be scheduled this cycle, skip it
2218 if (_current_latency[n_idx] > _bundle_cycle_number) {
2219 #ifndef PRODUCT
2220 if (_cfg->C->trace_opto_output())
2221 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n",
2222 n->_idx, _current_latency[n_idx], _bundle_cycle_number);
2223 #endif
2224 return (false);
2225 }
2226
2227 const Pipeline *node_pipeline = n->pipeline();
2228
2229 uint instruction_count = node_pipeline->instructionCount();
2230 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2231 instruction_count = 0;
2232 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2233 instruction_count++;
2234
2235 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) {
2236 #ifndef PRODUCT
2237 if (_cfg->C->trace_opto_output())
2238 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n",
2239 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle);
2240 #endif
2241 return (false);
2242 }
2243
2244 // Don't allow non-machine nodes to be handled this way
2245 if (!n->is_Mach() && instruction_count == 0)
2246 return (false);
2247
2248 // See if there is any overlap
2249 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse());
2250
2251 if (delay > 0) {
2252 #ifndef PRODUCT
2253 if (_cfg->C->trace_opto_output())
2254 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx);
2255 #endif
2256 return false;
2257 }
2258
2259 #ifndef PRODUCT
2260 if (_cfg->C->trace_opto_output())
2261 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx);
2262 #endif
2263
2264 return true;
2265 }
2266
2267 Node * Scheduling::ChooseNodeToBundle() {
2268 uint siz = _available.size();
2269
2270 if (siz == 0) {
2271
2272 #ifndef PRODUCT
2273 if (_cfg->C->trace_opto_output())
2274 tty->print("# ChooseNodeToBundle: null\n");
2275 #endif
2276 return (nullptr);
2277 }
2278
2279 // Fast path, if only 1 instruction in the bundle
2280 if (siz == 1) {
2281 #ifndef PRODUCT
2282 if (_cfg->C->trace_opto_output()) {
2283 tty->print("# ChooseNodeToBundle (only 1): ");
2284 _available[0]->dump();
2285 }
2286 #endif
2287 return (_available[0]);
2288 }
2289
2290 // Don't bother, if the bundle is already full
2291 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) {
2292 for ( uint i = 0; i < siz; i++ ) {
2293 Node *n = _available[i];
2294
2295 // Skip projections, we'll handle them another way
2296 if (n->is_Proj())
2297 continue;
2298
2299 // This presupposed that instructions are inserted into the
2300 // available list in a legality order; i.e. instructions that
2301 // must be inserted first are at the head of the list
2302 if (NodeFitsInBundle(n)) {
2303 #ifndef PRODUCT
2304 if (_cfg->C->trace_opto_output()) {
2305 tty->print("# ChooseNodeToBundle: ");
2306 n->dump();
2307 }
2308 #endif
2309 return (n);
2310 }
2311 }
2312 }
2313
2314 // Nothing fits in this bundle, choose the highest priority
2315 #ifndef PRODUCT
2316 if (_cfg->C->trace_opto_output()) {
2317 tty->print("# ChooseNodeToBundle: ");
2318 _available[0]->dump();
2319 }
2320 #endif
2321
2322 return _available[0];
2323 }
2324
2325 int Scheduling::compare_two_spill_nodes(Node* first, Node* second) {
2326 assert(first->is_MachSpillCopy() && second->is_MachSpillCopy(), "");
2327
2328 OptoReg::Name first_src_lo = _regalloc->get_reg_first(first->in(1));
2329 OptoReg::Name first_dst_lo = _regalloc->get_reg_first(first);
2330 OptoReg::Name second_src_lo = _regalloc->get_reg_first(second->in(1));
2331 OptoReg::Name second_dst_lo = _regalloc->get_reg_first(second);
2332
2333 // Comparison between stack -> reg and stack -> reg
2334 if (OptoReg::is_stack(first_src_lo) && OptoReg::is_stack(second_src_lo) &&
2335 OptoReg::is_reg(first_dst_lo) && OptoReg::is_reg(second_dst_lo)) {
2336 return _regalloc->reg2offset(first_src_lo) - _regalloc->reg2offset(second_src_lo);
2337 }
2338
2339 // Comparison between reg -> stack and reg -> stack
2340 if (OptoReg::is_stack(first_dst_lo) && OptoReg::is_stack(second_dst_lo) &&
2341 OptoReg::is_reg(first_src_lo) && OptoReg::is_reg(second_src_lo)) {
2342 return _regalloc->reg2offset(first_dst_lo) - _regalloc->reg2offset(second_dst_lo);
2343 }
2344
2345 return 0; // Not comparable
2346 }
2347
2348 void Scheduling::AddNodeToAvailableList(Node *n) {
2349 assert( !n->is_Proj(), "projections never directly made available" );
2350 #ifndef PRODUCT
2351 if (_cfg->C->trace_opto_output()) {
2352 tty->print("# AddNodeToAvailableList: ");
2353 n->dump();
2354 }
2355 #endif
2356
2357 int latency = _current_latency[n->_idx];
2358
2359 // Insert in latency order (insertion sort). If two MachSpillCopyNodes
2360 // for stack spilling or unspilling have the same latency, we sort
2361 // them in the order of stack offset. Some ports (e.g. aarch64) may also
2362 // have more opportunities to do ld/st merging
2363 uint i;
2364 for (i = 0; i < _available.size(); i++) {
2365 if (_current_latency[_available[i]->_idx] > latency) {
2366 break;
2367 } else if (_current_latency[_available[i]->_idx] == latency &&
2368 n->is_MachSpillCopy() && _available[i]->is_MachSpillCopy() &&
2369 compare_two_spill_nodes(n, _available[i]) > 0) {
2370 break;
2371 }
2372 }
2373
2374 // Special Check for compares following branches
2375 if( n->is_Mach() && _scheduled.size() > 0 ) {
2376 int op = n->as_Mach()->ideal_Opcode();
2377 Node *last = _scheduled[0];
2378 if( last->is_MachIf() && last->in(1) == n &&
2379 ( op == Op_CmpI ||
2380 op == Op_CmpU ||
2381 op == Op_CmpUL ||
2382 op == Op_CmpP ||
2383 op == Op_CmpF ||
2384 op == Op_CmpD ||
2385 op == Op_CmpL ) ) {
2386
2387 // Recalculate position, moving to front of same latency
2388 for ( i=0 ; i < _available.size(); i++ )
2389 if (_current_latency[_available[i]->_idx] >= latency)
2390 break;
2391 }
2392 }
2393
2394 // Insert the node in the available list
2395 _available.insert(i, n);
2396
2397 #ifndef PRODUCT
2398 if (_cfg->C->trace_opto_output())
2399 dump_available();
2400 #endif
2401 }
2402
2403 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) {
2404 for ( uint i=0; i < n->len(); i++ ) {
2405 Node *def = n->in(i);
2406 if (!def) continue;
2407 if( def->is_Proj() ) // If this is a machine projection, then
2408 def = def->in(0); // propagate usage thru to the base instruction
2409
2410 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local
2411 continue;
2412 }
2413
2414 // Compute the latency
2415 uint l = _bundle_cycle_number + n->latency(i);
2416 if (_current_latency[def->_idx] < l)
2417 _current_latency[def->_idx] = l;
2418
2419 // If this does not have uses then schedule it
2420 if ((--_uses[def->_idx]) == 0)
2421 AddNodeToAvailableList(def);
2422 }
2423 }
2424
2425 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) {
2426 #ifndef PRODUCT
2427 if (_cfg->C->trace_opto_output()) {
2428 tty->print("# AddNodeToBundle: ");
2429 n->dump();
2430 }
2431 #endif
2432
2433 // Remove this from the available list
2434 uint i;
2435 for (i = 0; i < _available.size(); i++)
2436 if (_available[i] == n)
2437 break;
2438 assert(i < _available.size(), "entry in _available list not found");
2439 _available.remove(i);
2440
2441 // See if this fits in the current bundle
2442 const Pipeline *node_pipeline = n->pipeline();
2443 const Pipeline_Use& node_usage = node_pipeline->resourceUse();
2444
2445 // Check for instructions to be placed in the delay slot. We
2446 // do this before we actually schedule the current instruction,
2447 // because the delay slot follows the current instruction.
2448 if (Pipeline::_branch_has_delay_slot &&
2449 node_pipeline->hasBranchDelay() &&
2450 !_unconditional_delay_slot) {
2451
2452 uint siz = _available.size();
2453
2454 // Conditional branches can support an instruction that
2455 // is unconditionally executed and not dependent by the
2456 // branch, OR a conditionally executed instruction if
2457 // the branch is taken. In practice, this means that
2458 // the first instruction at the branch target is
2459 // copied to the delay slot, and the branch goes to
2460 // the instruction after that at the branch target
2461 if ( n->is_MachBranch() ) {
2462
2463 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" );
2464 assert( !n->is_Catch(), "should not look for delay slot for Catch" );
2465
2466 #ifndef PRODUCT
2467 _branches++;
2468 #endif
2469
2470 // At least 1 instruction is on the available list
2471 // that is not dependent on the branch
2472 for (uint i = 0; i < siz; i++) {
2473 Node *d = _available[i];
2474 const Pipeline *avail_pipeline = d->pipeline();
2475
2476 // Don't allow safepoints in the branch shadow, that will
2477 // cause a number of difficulties
2478 if ( avail_pipeline->instructionCount() == 1 &&
2479 !avail_pipeline->hasMultipleBundles() &&
2480 !avail_pipeline->hasBranchDelay() &&
2481 Pipeline::instr_has_unit_size() &&
2482 d->size(_regalloc) == Pipeline::instr_unit_size() &&
2483 NodeFitsInBundle(d) &&
2484 !node_bundling(d)->used_in_delay()) {
2485
2486 if (d->is_Mach() && !d->is_MachSafePoint()) {
2487 // A node that fits in the delay slot was found, so we need to
2488 // set the appropriate bits in the bundle pipeline information so
2489 // that it correctly indicates resource usage. Later, when we
2490 // attempt to add this instruction to the bundle, we will skip
2491 // setting the resource usage.
2492 _unconditional_delay_slot = d;
2493 node_bundling(n)->set_use_unconditional_delay();
2494 node_bundling(d)->set_used_in_unconditional_delay();
2495 _bundle_use.add_usage(avail_pipeline->resourceUse());
2496 _current_latency[d->_idx] = _bundle_cycle_number;
2497 _next_node = d;
2498 ++_bundle_instr_count;
2499 #ifndef PRODUCT
2500 _unconditional_delays++;
2501 #endif
2502 break;
2503 }
2504 }
2505 }
2506 }
2507
2508 // No delay slot, add a nop to the usage
2509 if (!_unconditional_delay_slot) {
2510 // See if adding an instruction in the delay slot will overflow
2511 // the bundle.
2512 if (!NodeFitsInBundle(_nop)) {
2513 #ifndef PRODUCT
2514 if (_cfg->C->trace_opto_output())
2515 tty->print("# *** STEP(1 instruction for delay slot) ***\n");
2516 #endif
2517 step(1);
2518 }
2519
2520 _bundle_use.add_usage(_nop->pipeline()->resourceUse());
2521 _next_node = _nop;
2522 ++_bundle_instr_count;
2523 }
2524
2525 // See if the instruction in the delay slot requires a
2526 // step of the bundles
2527 if (!NodeFitsInBundle(n)) {
2528 #ifndef PRODUCT
2529 if (_cfg->C->trace_opto_output())
2530 tty->print("# *** STEP(branch won't fit) ***\n");
2531 #endif
2532 // Update the state information
2533 _bundle_instr_count = 0;
2534 _bundle_cycle_number += 1;
2535 _bundle_use.step(1);
2536 }
2537 }
2538
2539 // Get the number of instructions
2540 uint instruction_count = node_pipeline->instructionCount();
2541 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2542 instruction_count = 0;
2543
2544 // Compute the latency information
2545 uint delay = 0;
2546
2547 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) {
2548 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number;
2549 if (relative_latency < 0)
2550 relative_latency = 0;
2551
2552 delay = _bundle_use.full_latency(relative_latency, node_usage);
2553
2554 // Does not fit in this bundle, start a new one
2555 if (delay > 0) {
2556 step(delay);
2557
2558 #ifndef PRODUCT
2559 if (_cfg->C->trace_opto_output())
2560 tty->print("# *** STEP(%d) ***\n", delay);
2561 #endif
2562 }
2563 }
2564
2565 // If this was placed in the delay slot, ignore it
2566 if (n != _unconditional_delay_slot) {
2567
2568 if (delay == 0) {
2569 if (node_pipeline->hasMultipleBundles()) {
2570 #ifndef PRODUCT
2571 if (_cfg->C->trace_opto_output())
2572 tty->print("# *** STEP(multiple instructions) ***\n");
2573 #endif
2574 step(1);
2575 }
2576
2577 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) {
2578 #ifndef PRODUCT
2579 if (_cfg->C->trace_opto_output())
2580 tty->print("# *** STEP(%d >= %d instructions) ***\n",
2581 instruction_count + _bundle_instr_count,
2582 Pipeline::_max_instrs_per_cycle);
2583 #endif
2584 step(1);
2585 }
2586 }
2587
2588 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2589 _bundle_instr_count++;
2590
2591 // Set the node's latency
2592 _current_latency[n->_idx] = _bundle_cycle_number;
2593
2594 // Now merge the functional unit information
2595 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode())
2596 _bundle_use.add_usage(node_usage);
2597
2598 // Increment the number of instructions in this bundle
2599 _bundle_instr_count += instruction_count;
2600
2601 // Remember this node for later
2602 if (n->is_Mach())
2603 _next_node = n;
2604 }
2605
2606 // It's possible to have a BoxLock in the graph and in the _bbs mapping but
2607 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks.
2608 // 'Schedule' them (basically ignore in the schedule) but do not insert them
2609 // into the block. All other scheduled nodes get put in the schedule here.
2610 int op = n->Opcode();
2611 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR
2612 (op != Op_Node && // Not an unused antidepedence node and
2613 // not an unallocated boxlock
2614 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) {
2615
2616 // Push any trailing projections
2617 if( bb->get_node(bb->number_of_nodes()-1) != n ) {
2618 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
2619 Node *foi = n->fast_out(i);
2620 if( foi->is_Proj() )
2621 _scheduled.push(foi);
2622 }
2623 }
2624
2625 // Put the instruction in the schedule list
2626 _scheduled.push(n);
2627 }
2628
2629 #ifndef PRODUCT
2630 if (_cfg->C->trace_opto_output())
2631 dump_available();
2632 #endif
2633
2634 // Walk all the definitions, decrementing use counts, and
2635 // if a definition has a 0 use count, place it in the available list.
2636 DecrementUseCounts(n,bb);
2637 }
2638
2639 // This method sets the use count within a basic block. We will ignore all
2640 // uses outside the current basic block. As we are doing a backwards walk,
2641 // any node we reach that has a use count of 0 may be scheduled. This also
2642 // avoids the problem of cyclic references from phi nodes, as long as phi
2643 // nodes are at the front of the basic block. This method also initializes
2644 // the available list to the set of instructions that have no uses within this
2645 // basic block.
2646 void Scheduling::ComputeUseCount(const Block *bb) {
2647 #ifndef PRODUCT
2648 if (_cfg->C->trace_opto_output())
2649 tty->print("# -> ComputeUseCount\n");
2650 #endif
2651
2652 // Clear the list of available and scheduled instructions, just in case
2653 _available.clear();
2654 _scheduled.clear();
2655
2656 // No delay slot specified
2657 _unconditional_delay_slot = nullptr;
2658
2659 #ifdef ASSERT
2660 for( uint i=0; i < bb->number_of_nodes(); i++ )
2661 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" );
2662 #endif
2663
2664 // Force the _uses count to never go to zero for unscheduable pieces
2665 // of the block
2666 for( uint k = 0; k < _bb_start; k++ )
2667 _uses[bb->get_node(k)->_idx] = 1;
2668 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ )
2669 _uses[bb->get_node(l)->_idx] = 1;
2670
2671 // Iterate backwards over the instructions in the block. Don't count the
2672 // branch projections at end or the block header instructions.
2673 for( uint j = _bb_end-1; j >= _bb_start; j-- ) {
2674 Node *n = bb->get_node(j);
2675 if( n->is_Proj() ) continue; // Projections handled another way
2676
2677 // Account for all uses
2678 for ( uint k = 0; k < n->len(); k++ ) {
2679 Node *inp = n->in(k);
2680 if (!inp) continue;
2681 assert(inp != n, "no cycles allowed" );
2682 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use?
2683 if (inp->is_Proj()) { // Skip through Proj's
2684 inp = inp->in(0);
2685 }
2686 ++_uses[inp->_idx]; // Count 1 block-local use
2687 }
2688 }
2689
2690 // If this instruction has a 0 use count, then it is available
2691 if (!_uses[n->_idx]) {
2692 _current_latency[n->_idx] = _bundle_cycle_number;
2693 AddNodeToAvailableList(n);
2694 }
2695
2696 #ifndef PRODUCT
2697 if (_cfg->C->trace_opto_output()) {
2698 tty->print("# uses: %3d: ", _uses[n->_idx]);
2699 n->dump();
2700 }
2701 #endif
2702 }
2703
2704 #ifndef PRODUCT
2705 if (_cfg->C->trace_opto_output())
2706 tty->print("# <- ComputeUseCount\n");
2707 #endif
2708 }
2709
2710 // This routine performs scheduling on each basic block in reverse order,
2711 // using instruction latencies and taking into account function unit
2712 // availability.
2713 void Scheduling::DoScheduling() {
2714 #ifndef PRODUCT
2715 if (_cfg->C->trace_opto_output())
2716 tty->print("# -> DoScheduling\n");
2717 #endif
2718
2719 Block *succ_bb = nullptr;
2720 Block *bb;
2721 Compile* C = Compile::current();
2722
2723 // Walk over all the basic blocks in reverse order
2724 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) {
2725 bb = _cfg->get_block(i);
2726
2727 #ifndef PRODUCT
2728 if (_cfg->C->trace_opto_output()) {
2729 tty->print("# Schedule BB#%03d (initial)\n", i);
2730 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2731 bb->get_node(j)->dump();
2732 }
2733 }
2734 #endif
2735
2736 // On the head node, skip processing
2737 if (bb == _cfg->get_root_block()) {
2738 continue;
2739 }
2740
2741 // Skip empty, connector blocks
2742 if (bb->is_connector())
2743 continue;
2744
2745 // If the following block is not the sole successor of
2746 // this one, then reset the pipeline information
2747 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) {
2748 #ifndef PRODUCT
2749 if (_cfg->C->trace_opto_output()) {
2750 tty->print("*** bundle start of next BB, node %d, for %d instructions\n",
2751 _next_node->_idx, _bundle_instr_count);
2752 }
2753 #endif
2754 step_and_clear();
2755 }
2756
2757 // Leave untouched the starting instruction, any Phis, a CreateEx node
2758 // or Top. bb->get_node(_bb_start) is the first schedulable instruction.
2759 _bb_end = bb->number_of_nodes()-1;
2760 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) {
2761 Node *n = bb->get_node(_bb_start);
2762 // Things not matched, like Phinodes and ProjNodes don't get scheduled.
2763 // Also, MachIdealNodes do not get scheduled
2764 if( !n->is_Mach() ) continue; // Skip non-machine nodes
2765 MachNode *mach = n->as_Mach();
2766 int iop = mach->ideal_Opcode();
2767 if( iop == Op_CreateEx ) continue; // CreateEx is pinned
2768 if( iop == Op_Con ) continue; // Do not schedule Top
2769 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes
2770 mach->pipeline() == MachNode::pipeline_class() &&
2771 !n->is_SpillCopy() && !n->is_MachMerge() ) // Breakpoints, Prolog, etc
2772 continue;
2773 break; // Funny loop structure to be sure...
2774 }
2775 // Compute last "interesting" instruction in block - last instruction we
2776 // might schedule. _bb_end points just after last schedulable inst. We
2777 // normally schedule conditional branches (despite them being forced last
2778 // in the block), because they have delay slots we can fill. Calls all
2779 // have their delay slots filled in the template expansions, so we don't
2780 // bother scheduling them.
2781 Node *last = bb->get_node(_bb_end);
2782 // Ignore trailing NOPs.
2783 while (_bb_end > 0 && last->is_Mach() &&
2784 last->as_Mach()->ideal_Opcode() == Op_Con) {
2785 last = bb->get_node(--_bb_end);
2786 }
2787 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, "");
2788 if( last->is_Catch() ||
2789 (last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) {
2790 // There might be a prior call. Skip it.
2791 while (_bb_start < _bb_end && bb->get_node(--_bb_end)->is_MachProj());
2792 } else if( last->is_MachNullCheck() ) {
2793 // Backup so the last null-checked memory instruction is
2794 // outside the schedulable range. Skip over the nullcheck,
2795 // projection, and the memory nodes.
2796 Node *mem = last->in(1);
2797 do {
2798 _bb_end--;
2799 } while (mem != bb->get_node(_bb_end));
2800 } else {
2801 // Set _bb_end to point after last schedulable inst.
2802 _bb_end++;
2803 }
2804
2805 assert( _bb_start <= _bb_end, "inverted block ends" );
2806
2807 // Compute the register antidependencies for the basic block
2808 ComputeRegisterAntidependencies(bb);
2809 if (C->failing()) return; // too many D-U pinch points
2810
2811 // Compute the usage within the block, and set the list of all nodes
2812 // in the block that have no uses within the block.
2813 ComputeUseCount(bb);
2814
2815 // Schedule the remaining instructions in the block
2816 while ( _available.size() > 0 ) {
2817 Node *n = ChooseNodeToBundle();
2818 guarantee(n != nullptr, "no nodes available");
2819 AddNodeToBundle(n,bb);
2820 }
2821
2822 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" );
2823 #ifdef ASSERT
2824 for( uint l = _bb_start; l < _bb_end; l++ ) {
2825 Node *n = bb->get_node(l);
2826 uint m;
2827 for( m = 0; m < _bb_end-_bb_start; m++ )
2828 if( _scheduled[m] == n )
2829 break;
2830 assert( m < _bb_end-_bb_start, "instruction missing in schedule" );
2831 }
2832 #endif
2833
2834 // Now copy the instructions (in reverse order) back to the block
2835 for ( uint k = _bb_start; k < _bb_end; k++ )
2836 bb->map_node(_scheduled[_bb_end-k-1], k);
2837
2838 #ifndef PRODUCT
2839 if (_cfg->C->trace_opto_output()) {
2840 tty->print("# Schedule BB#%03d (final)\n", i);
2841 uint current = 0;
2842 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2843 Node *n = bb->get_node(j);
2844 if( valid_bundle_info(n) ) {
2845 Bundle *bundle = node_bundling(n);
2846 if (bundle->instr_count() > 0 || bundle->flags() > 0) {
2847 tty->print("*** Bundle: ");
2848 bundle->dump();
2849 }
2850 n->dump();
2851 }
2852 }
2853 }
2854 #endif
2855 #ifdef ASSERT
2856 verify_good_schedule(bb,"after block local scheduling");
2857 #endif
2858 }
2859
2860 #ifndef PRODUCT
2861 if (_cfg->C->trace_opto_output())
2862 tty->print("# <- DoScheduling\n");
2863 #endif
2864
2865 // Record final node-bundling array location
2866 _regalloc->C->output()->set_node_bundling_base(_node_bundling_base);
2867
2868 } // end DoScheduling
2869
2870 // Verify that no live-range used in the block is killed in the block by a
2871 // wrong DEF. This doesn't verify live-ranges that span blocks.
2872
2873 // Check for edge existence. Used to avoid adding redundant precedence edges.
2874 static bool edge_from_to( Node *from, Node *to ) {
2875 for( uint i=0; i<from->len(); i++ )
2876 if( from->in(i) == to )
2877 return true;
2878 return false;
2879 }
2880
2881 #ifdef ASSERT
2882 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) {
2883 // Check for bad kills
2884 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow
2885 Node *prior_use = _reg_node[def];
2886 if( prior_use && !edge_from_to(prior_use,n) ) {
2887 tty->print("%s = ",OptoReg::as_VMReg(def)->name());
2888 n->dump();
2889 tty->print_cr("...");
2890 prior_use->dump();
2891 assert(edge_from_to(prior_use,n), "%s", msg);
2892 }
2893 _reg_node.map(def,nullptr); // Kill live USEs
2894 }
2895 }
2896
2897 void Scheduling::verify_good_schedule( Block *b, const char *msg ) {
2898
2899 // Zap to something reasonable for the verify code
2900 _reg_node.clear();
2901
2902 // Walk over the block backwards. Check to make sure each DEF doesn't
2903 // kill a live value (other than the one it's supposed to). Add each
2904 // USE to the live set.
2905 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) {
2906 Node *n = b->get_node(i);
2907 int n_op = n->Opcode();
2908 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) {
2909 // Fat-proj kills a slew of registers
2910 RegMaskIterator rmi(n->out_RegMask());
2911 while (rmi.has_next()) {
2912 OptoReg::Name kill = rmi.next();
2913 verify_do_def(n, kill, msg);
2914 }
2915 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes
2916 // Get DEF'd registers the normal way
2917 verify_do_def( n, _regalloc->get_reg_first(n), msg );
2918 verify_do_def( n, _regalloc->get_reg_second(n), msg );
2919 }
2920
2921 // Now make all USEs live
2922 for( uint i=1; i<n->req(); i++ ) {
2923 Node *def = n->in(i);
2924 assert(def != nullptr, "input edge required");
2925 OptoReg::Name reg_lo = _regalloc->get_reg_first(def);
2926 OptoReg::Name reg_hi = _regalloc->get_reg_second(def);
2927 if( OptoReg::is_valid(reg_lo) ) {
2928 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), "%s", msg);
2929 _reg_node.map(reg_lo,n);
2930 }
2931 if( OptoReg::is_valid(reg_hi) ) {
2932 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), "%s", msg);
2933 _reg_node.map(reg_hi,n);
2934 }
2935 }
2936
2937 }
2938
2939 // Zap to something reasonable for the Antidependence code
2940 _reg_node.clear();
2941 }
2942 #endif
2943
2944 // Conditionally add precedence edges. Avoid putting edges on Projs.
2945 static void add_prec_edge_from_to( Node *from, Node *to ) {
2946 if( from->is_Proj() ) { // Put precedence edge on Proj's input
2947 assert( from->req() == 1 && (from->len() == 1 || from->in(1) == nullptr), "no precedence edges on projections" );
2948 from = from->in(0);
2949 }
2950 if( from != to && // No cycles (for things like LD L0,[L0+4] )
2951 !edge_from_to( from, to ) ) // Avoid duplicate edge
2952 from->add_prec(to);
2953 }
2954
2955 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) {
2956 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow
2957 return;
2958
2959 if (OptoReg::is_reg(def_reg)) {
2960 VMReg vmreg = OptoReg::as_VMReg(def_reg);
2961 if (vmreg->is_reg() && !vmreg->is_concrete() && !vmreg->prev()->is_concrete()) {
2962 // This is one of the high slots of a vector register.
2963 // ScheduleAndBundle already checked there are no live wide
2964 // vectors in this method so it can be safely ignored.
2965 return;
2966 }
2967 }
2968
2969 Node *pinch = _reg_node[def_reg]; // Get pinch point
2970 if ((pinch == nullptr) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet?
2971 is_def ) { // Check for a true def (not a kill)
2972 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point
2973 return;
2974 }
2975
2976 Node *kill = def; // Rename 'def' to more descriptive 'kill'
2977 DEBUG_ONLY( def = (Node*)((intptr_t)0xdeadbeef); )
2978
2979 // After some number of kills there _may_ be a later def
2980 Node *later_def = nullptr;
2981
2982 Compile* C = Compile::current();
2983
2984 // Finding a kill requires a real pinch-point.
2985 // Check for not already having a pinch-point.
2986 // Pinch points are Op_Node's.
2987 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point?
2988 later_def = pinch; // Must be def/kill as optimistic pinch-point
2989 if ( _pinch_free_list.size() > 0) {
2990 pinch = _pinch_free_list.pop();
2991 } else {
2992 pinch = new Node(1); // Pinch point to-be
2993 }
2994 if (pinch->_idx >= _regalloc->node_regs_max_index()) {
2995 DEBUG_ONLY( pinch->dump(); );
2996 assert(false, "too many D-U pinch points: %d >= %d", pinch->_idx, _regalloc->node_regs_max_index());
2997 _cfg->C->record_method_not_compilable("too many D-U pinch points");
2998 return;
2999 }
3000 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init)
3001 _reg_node.map(def_reg,pinch); // Record pinch-point
3002 //regalloc()->set_bad(pinch->_idx); // Already initialized this way.
3003 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill
3004 pinch->init_req(0, C->top()); // set not null for the next call
3005 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch
3006 later_def = nullptr; // and no later def
3007 }
3008 pinch->set_req(0,later_def); // Hook later def so we can find it
3009 } else { // Else have valid pinch point
3010 if( pinch->in(0) ) // If there is a later-def
3011 later_def = pinch->in(0); // Get it
3012 }
3013
3014 // Add output-dependence edge from later def to kill
3015 if( later_def ) // If there is some original def
3016 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill
3017
3018 // See if current kill is also a use, and so is forced to be the pinch-point.
3019 if( pinch->Opcode() == Op_Node ) {
3020 Node *uses = kill->is_Proj() ? kill->in(0) : kill;
3021 for( uint i=1; i<uses->req(); i++ ) {
3022 if( _regalloc->get_reg_first(uses->in(i)) == def_reg ||
3023 _regalloc->get_reg_second(uses->in(i)) == def_reg ) {
3024 // Yes, found a use/kill pinch-point
3025 pinch->set_req(0,nullptr); //
3026 pinch->replace_by(kill); // Move anti-dep edges up
3027 pinch = kill;
3028 _reg_node.map(def_reg,pinch);
3029 return;
3030 }
3031 }
3032 }
3033
3034 // Add edge from kill to pinch-point
3035 add_prec_edge_from_to(kill,pinch);
3036 }
3037
3038 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) {
3039 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow
3040 return;
3041 Node *pinch = _reg_node[use_reg]; // Get pinch point
3042 // Check for no later def_reg/kill in block
3043 if ((pinch != nullptr) && _cfg->get_block_for_node(pinch) == b &&
3044 // Use has to be block-local as well
3045 _cfg->get_block_for_node(use) == b) {
3046 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?)
3047 pinch->req() == 1 ) { // pinch not yet in block?
3048 pinch->del_req(0); // yank pointer to later-def, also set flag
3049 // Insert the pinch-point in the block just after the last use
3050 b->insert_node(pinch, b->find_node(use) + 1);
3051 _bb_end++; // Increase size scheduled region in block
3052 }
3053
3054 add_prec_edge_from_to(pinch,use);
3055 }
3056 }
3057
3058 // We insert antidependences between the reads and following write of
3059 // allocated registers to prevent illegal code motion. Hopefully, the
3060 // number of added references should be fairly small, especially as we
3061 // are only adding references within the current basic block.
3062 void Scheduling::ComputeRegisterAntidependencies(Block *b) {
3063
3064 #ifdef ASSERT
3065 verify_good_schedule(b,"before block local scheduling");
3066 #endif
3067
3068 // A valid schedule, for each register independently, is an endless cycle
3069 // of: a def, then some uses (connected to the def by true dependencies),
3070 // then some kills (defs with no uses), finally the cycle repeats with a new
3071 // def. The uses are allowed to float relative to each other, as are the
3072 // kills. No use is allowed to slide past a kill (or def). This requires
3073 // antidependencies between all uses of a single def and all kills that
3074 // follow, up to the next def. More edges are redundant, because later defs
3075 // & kills are already serialized with true or antidependencies. To keep
3076 // the edge count down, we add a 'pinch point' node if there's more than
3077 // one use or more than one kill/def.
3078
3079 // We add dependencies in one bottom-up pass.
3080
3081 // For each instruction we handle it's DEFs/KILLs, then it's USEs.
3082
3083 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this
3084 // register. If not, we record the DEF/KILL in _reg_node, the
3085 // register-to-def mapping. If there is a prior DEF/KILL, we insert a
3086 // "pinch point", a new Node that's in the graph but not in the block.
3087 // We put edges from the prior and current DEF/KILLs to the pinch point.
3088 // We put the pinch point in _reg_node. If there's already a pinch point
3089 // we merely add an edge from the current DEF/KILL to the pinch point.
3090
3091 // After doing the DEF/KILLs, we handle USEs. For each used register, we
3092 // put an edge from the pinch point to the USE.
3093
3094 // To be expedient, the _reg_node array is pre-allocated for the whole
3095 // compilation. _reg_node is lazily initialized; it either contains a null,
3096 // or a valid def/kill/pinch-point, or a leftover node from some prior
3097 // block. Leftover node from some prior block is treated like a null (no
3098 // prior def, so no anti-dependence needed). Valid def is distinguished by
3099 // it being in the current block.
3100 bool fat_proj_seen = false;
3101 uint last_safept = _bb_end-1;
3102 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : nullptr;
3103 Node* last_safept_node = end_node;
3104 for( uint i = _bb_end-1; i >= _bb_start; i-- ) {
3105 Node *n = b->get_node(i);
3106 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges
3107 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) {
3108 // Fat-proj kills a slew of registers
3109 // This can add edges to 'n' and obscure whether or not it was a def,
3110 // hence the is_def flag.
3111 fat_proj_seen = true;
3112 RegMaskIterator rmi(n->out_RegMask());
3113 while (rmi.has_next()) {
3114 OptoReg::Name kill = rmi.next();
3115 anti_do_def(b, n, kill, is_def);
3116 }
3117 } else {
3118 // Get DEF'd registers the normal way
3119 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def );
3120 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def );
3121 }
3122
3123 // Kill projections on a branch should appear to occur on the
3124 // branch, not afterwards, so grab the masks from the projections
3125 // and process them.
3126 if (n->is_MachBranch() || (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump)) {
3127 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3128 Node* use = n->fast_out(i);
3129 if (use->is_Proj()) {
3130 RegMaskIterator rmi(use->out_RegMask());
3131 while (rmi.has_next()) {
3132 OptoReg::Name kill = rmi.next();
3133 anti_do_def(b, n, kill, false);
3134 }
3135 }
3136 }
3137 }
3138
3139 // Check each register used by this instruction for a following DEF/KILL
3140 // that must occur afterward and requires an anti-dependence edge.
3141 for( uint j=0; j<n->req(); j++ ) {
3142 Node *def = n->in(j);
3143 if( def ) {
3144 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" );
3145 anti_do_use( b, n, _regalloc->get_reg_first(def) );
3146 anti_do_use( b, n, _regalloc->get_reg_second(def) );
3147 }
3148 }
3149 // Do not allow defs of new derived values to float above GC
3150 // points unless the base is definitely available at the GC point.
3151
3152 Node *m = b->get_node(i);
3153
3154 // Add precedence edge from following safepoint to use of derived pointer
3155 if( last_safept_node != end_node &&
3156 m != last_safept_node) {
3157 for (uint k = 1; k < m->req(); k++) {
3158 const Type *t = m->in(k)->bottom_type();
3159 if( t->isa_oop_ptr() &&
3160 t->is_ptr()->offset() != 0 ) {
3161 last_safept_node->add_prec( m );
3162 break;
3163 }
3164 }
3165 }
3166
3167 if( n->jvms() ) { // Precedence edge from derived to safept
3168 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
3169 if( b->get_node(last_safept) != last_safept_node ) {
3170 last_safept = b->find_node(last_safept_node);
3171 }
3172 for( uint j=last_safept; j > i; j-- ) {
3173 Node *mach = b->get_node(j);
3174 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
3175 mach->add_prec( n );
3176 }
3177 last_safept = i;
3178 last_safept_node = m;
3179 }
3180 }
3181
3182 if (fat_proj_seen) {
3183 // Garbage collect pinch nodes that were not consumed.
3184 // They are usually created by a fat kill MachProj for a call.
3185 garbage_collect_pinch_nodes();
3186 }
3187 }
3188
3189 // Garbage collect pinch nodes for reuse by other blocks.
3190 //
3191 // The block scheduler's insertion of anti-dependence
3192 // edges creates many pinch nodes when the block contains
3193 // 2 or more Calls. A pinch node is used to prevent a
3194 // combinatorial explosion of edges. If a set of kills for a
3195 // register is anti-dependent on a set of uses (or defs), rather
3196 // than adding an edge in the graph between each pair of kill
3197 // and use (or def), a pinch is inserted between them:
3198 //
3199 // use1 use2 use3
3200 // \ | /
3201 // \ | /
3202 // pinch
3203 // / | \
3204 // / | \
3205 // kill1 kill2 kill3
3206 //
3207 // One pinch node is created per register killed when
3208 // the second call is encountered during a backwards pass
3209 // over the block. Most of these pinch nodes are never
3210 // wired into the graph because the register is never
3211 // used or def'ed in the block.
3212 //
3213 void Scheduling::garbage_collect_pinch_nodes() {
3214 #ifndef PRODUCT
3215 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:");
3216 #endif
3217 int trace_cnt = 0;
3218 for (uint k = 0; k < _reg_node.max(); k++) {
3219 Node* pinch = _reg_node[k];
3220 if ((pinch != nullptr) && pinch->Opcode() == Op_Node &&
3221 // no predecence input edges
3222 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == nullptr) ) {
3223 cleanup_pinch(pinch);
3224 _pinch_free_list.push(pinch);
3225 _reg_node.map(k, nullptr);
3226 #ifndef PRODUCT
3227 if (_cfg->C->trace_opto_output()) {
3228 trace_cnt++;
3229 if (trace_cnt > 40) {
3230 tty->print("\n");
3231 trace_cnt = 0;
3232 }
3233 tty->print(" %d", pinch->_idx);
3234 }
3235 #endif
3236 }
3237 }
3238 #ifndef PRODUCT
3239 if (_cfg->C->trace_opto_output()) tty->print("\n");
3240 #endif
3241 }
3242
3243 // Clean up a pinch node for reuse.
3244 void Scheduling::cleanup_pinch( Node *pinch ) {
3245 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking");
3246
3247 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) {
3248 Node* use = pinch->last_out(i);
3249 uint uses_found = 0;
3250 for (uint j = use->req(); j < use->len(); j++) {
3251 if (use->in(j) == pinch) {
3252 use->rm_prec(j);
3253 uses_found++;
3254 }
3255 }
3256 assert(uses_found > 0, "must be a precedence edge");
3257 i -= uses_found; // we deleted 1 or more copies of this edge
3258 }
3259 // May have a later_def entry
3260 pinch->set_req(0, nullptr);
3261 }
3262
3263 #ifndef PRODUCT
3264
3265 void Scheduling::dump_available() const {
3266 tty->print("#Availist ");
3267 for (uint i = 0; i < _available.size(); i++)
3268 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]);
3269 tty->cr();
3270 }
3271
3272 // Print Scheduling Statistics
3273 void Scheduling::print_statistics() {
3274 // Print the size added by nops for bundling
3275 tty->print("Nops added %d bytes to total of %d bytes",
3276 _total_nop_size, _total_method_size);
3277 if (_total_method_size > 0)
3278 tty->print(", for %.2f%%",
3279 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0);
3280 tty->print("\n");
3281
3282 // Print the number of branch shadows filled
3283 if (Pipeline::_branch_has_delay_slot) {
3284 tty->print("Of %d branches, %d had unconditional delay slots filled",
3285 _total_branches, _total_unconditional_delays);
3286 if (_total_branches > 0)
3287 tty->print(", for %.2f%%",
3288 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0);
3289 tty->print("\n");
3290 }
3291
3292 uint total_instructions = 0, total_bundles = 0;
3293
3294 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) {
3295 uint bundle_count = _total_instructions_per_bundle[i];
3296 total_instructions += bundle_count * i;
3297 total_bundles += bundle_count;
3298 }
3299
3300 if (total_bundles > 0)
3301 tty->print("Average ILP (excluding nops) is %.2f\n",
3302 ((double)total_instructions) / ((double)total_bundles));
3303 }
3304 #endif
3305
3306 //-----------------------init_scratch_buffer_blob------------------------------
3307 // Construct a temporary BufferBlob and cache it for this compile.
3308 void PhaseOutput::init_scratch_buffer_blob(int const_size) {
3309 // If there is already a scratch buffer blob allocated and the
3310 // constant section is big enough, use it. Otherwise free the
3311 // current and allocate a new one.
3312 BufferBlob* blob = scratch_buffer_blob();
3313 if ((blob != nullptr) && (const_size <= _scratch_const_size)) {
3314 // Use the current blob.
3315 } else {
3316 if (blob != nullptr) {
3317 BufferBlob::free(blob);
3318 }
3319
3320 ResourceMark rm;
3321 _scratch_const_size = const_size;
3322 int size = C2Compiler::initial_code_buffer_size(const_size);
3323 blob = BufferBlob::create("Compile::scratch_buffer", size);
3324 // Record the buffer blob for next time.
3325 set_scratch_buffer_blob(blob);
3326 // Have we run out of code space?
3327 if (scratch_buffer_blob() == nullptr) {
3328 // Let CompilerBroker disable further compilations.
3329 C->record_failure("Not enough space for scratch buffer in CodeCache");
3330 return;
3331 }
3332 }
3333
3334 // Initialize the relocation buffers
3335 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
3336 set_scratch_locs_memory(locs_buf);
3337 }
3338
3339
3340 //-----------------------scratch_emit_size-------------------------------------
3341 // Helper function that computes size by emitting code
3342 uint PhaseOutput::scratch_emit_size(const Node* n) {
3343 // Start scratch_emit_size section.
3344 set_in_scratch_emit_size(true);
3345
3346 // Emit into a trash buffer and count bytes emitted.
3347 // This is a pretty expensive way to compute a size,
3348 // but it works well enough if seldom used.
3349 // All common fixed-size instructions are given a size
3350 // method by the AD file.
3351 // Note that the scratch buffer blob and locs memory are
3352 // allocated at the beginning of the compile task, and
3353 // may be shared by several calls to scratch_emit_size.
3354 // The allocation of the scratch buffer blob is particularly
3355 // expensive, since it has to grab the code cache lock.
3356 BufferBlob* blob = this->scratch_buffer_blob();
3357 assert(blob != nullptr, "Initialize BufferBlob at start");
3358 assert(blob->size() > max_inst_size(), "sanity");
3359 relocInfo* locs_buf = scratch_locs_memory();
3360 address blob_begin = blob->content_begin();
3361 address blob_end = (address)locs_buf;
3362 assert(blob->contains(blob_end), "sanity");
3363 CodeBuffer buf(blob_begin, blob_end - blob_begin);
3364 buf.initialize_consts_size(_scratch_const_size);
3365 buf.initialize_stubs_size(MAX_stubs_size);
3366 assert(locs_buf != nullptr, "sanity");
3367 int lsize = MAX_locs_size / 3;
3368 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
3369 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
3370 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
3371 // Mark as scratch buffer.
3372 buf.consts()->set_scratch_emit();
3373 buf.insts()->set_scratch_emit();
3374 buf.stubs()->set_scratch_emit();
3375
3376 // Do the emission.
3377
3378 Label fakeL; // Fake label for branch instructions.
3379 Label* saveL = nullptr;
3380 uint save_bnum = 0;
3381 bool is_branch = n->is_MachBranch();
3382 C2_MacroAssembler masm(&buf);
3383 masm.bind(fakeL);
3384 if (is_branch) {
3385 n->as_MachBranch()->save_label(&saveL, &save_bnum);
3386 n->as_MachBranch()->label_set(&fakeL, 0);
3387 }
3388 n->emit(&masm, C->regalloc());
3389
3390 // Emitting into the scratch buffer should not fail
3391 assert(!C->failing_internal() || C->failure_is_artificial(), "Must not have pending failure. Reason is: %s", C->failure_reason());
3392
3393 if (is_branch) // Restore label.
3394 n->as_MachBranch()->label_set(saveL, save_bnum);
3395
3396 // End scratch_emit_size section.
3397 set_in_scratch_emit_size(false);
3398
3399 return buf.insts_size();
3400 }
3401
3402 void PhaseOutput::install() {
3403 if (C->should_install_code() && C->stub_function() != nullptr) {
3404 install_stub(C->stub_name());
3405 } else {
3406 install_code(C->method(),
3407 C->entry_bci(),
3408 CompilerThread::current()->compiler(),
3409 C->has_unsafe_access(),
3410 SharedRuntime::is_wide_vector(C->max_vector_size()));
3411 }
3412 }
3413
3414 void PhaseOutput::install_code(ciMethod* target,
3415 int entry_bci,
3416 AbstractCompiler* compiler,
3417 bool has_unsafe_access,
3418 bool has_wide_vectors) {
3419 // Check if we want to skip execution of all compiled code.
3420 {
3421 #ifndef PRODUCT
3422 if (OptoNoExecute) {
3423 C->record_method_not_compilable("+OptoNoExecute"); // Flag as failed
3424 return;
3425 }
3426 #endif
3427 Compile::TracePhase tp(_t_registerMethod);
3428
3429 if (C->is_osr_compilation()) {
3430 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
3431 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
3432 } else {
3433 if (!target->is_static()) {
3434 // The UEP of an nmethod ensures that the VEP is padded. However, the padding of the UEP is placed
3435 // before the inline cache check, so we don't have to execute any nop instructions when dispatching
3436 // through the UEP, yet we can ensure that the VEP is aligned appropriately.
3437 _code_offsets.set_value(CodeOffsets::Entry, _first_block_size - MacroAssembler::ic_check_size());
3438 }
3439 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
3440 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
3441 }
3442
3443 C->env()->register_method(target,
3444 entry_bci,
3445 &_code_offsets,
3446 _orig_pc_slot_offset_in_bytes,
3447 code_buffer(),
3448 frame_size_in_words(),
3449 oop_map_set(),
3450 &_handler_table,
3451 inc_table(),
3452 compiler,
3453 C->has_clinit_barriers(),
3454 C->for_preload(),
3455 has_unsafe_access,
3456 SharedRuntime::is_wide_vector(C->max_vector_size()),
3457 C->has_monitors(),
3458 C->has_scoped_access(),
3459 0,
3460 C->should_install_code());
3461
3462 if (C->log() != nullptr) { // Print code cache state into compiler log
3463 C->log()->code_cache_state();
3464 }
3465 assert(!C->has_clinit_barriers() || C->for_preload(), "class init barriers should be only in preload code");
3466 }
3467 }
3468 void PhaseOutput::install_stub(const char* stub_name) {
3469 // Entry point will be accessed using stub_entry_point();
3470 if (code_buffer() == nullptr) {
3471 Matcher::soft_match_failure();
3472 } else {
3473 if (PrintAssembly && (WizardMode || Verbose))
3474 tty->print_cr("### Stub::%s", stub_name);
3475
3476 if (!C->failing()) {
3477 assert(C->fixed_slots() == 0, "no fixed slots used for runtime stubs");
3478
3479 // Make the NMethod
3480 // For now we mark the frame as never safe for profile stackwalking
3481 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
3482 code_buffer(),
3483 CodeOffsets::frame_never_safe,
3484 // _code_offsets.value(CodeOffsets::Frame_Complete),
3485 frame_size_in_words(),
3486 oop_map_set(),
3487 false,
3488 false);
3489
3490 if (rs == nullptr) {
3491 C->record_failure("CodeCache is full");
3492 } else {
3493 assert(rs->is_runtime_stub(), "sanity check");
3494 C->set_stub_entry_point(rs->entry_point());
3495 BlobId blob_id = StubInfo::blob(C->stub_id());
3496 AOTCodeCache::store_code_blob(*rs, AOTCodeEntry::C2Blob, blob_id);
3497 }
3498 }
3499 }
3500 }
3501
3502 // Support for bundling info
3503 Bundle* PhaseOutput::node_bundling(const Node *n) {
3504 assert(valid_bundle_info(n), "oob");
3505 return &_node_bundling_base[n->_idx];
3506 }
3507
3508 bool PhaseOutput::valid_bundle_info(const Node *n) {
3509 return (_node_bundling_limit > n->_idx);
3510 }
3511
3512 //------------------------------frame_size_in_words-----------------------------
3513 // frame_slots in units of words
3514 int PhaseOutput::frame_size_in_words() const {
3515 // shift is 0 in LP32 and 1 in LP64
3516 const int shift = (LogBytesPerWord - LogBytesPerInt);
3517 int words = _frame_slots >> shift;
3518 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
3519 return words;
3520 }
3521
3522 // To bang the stack of this compiled method we use the stack size
3523 // that the interpreter would need in case of a deoptimization. This
3524 // removes the need to bang the stack in the deoptimization blob which
3525 // in turn simplifies stack overflow handling.
3526 int PhaseOutput::bang_size_in_bytes() const {
3527 return MAX2(frame_size_in_bytes() + os::extra_bang_size_in_bytes(), C->interpreter_frame_size());
3528 }
3529
3530 //------------------------------dump_asm---------------------------------------
3531 // Dump formatted assembly
3532 #if defined(SUPPORT_OPTO_ASSEMBLY)
3533 void PhaseOutput::dump_asm_on(outputStream* st, int* pcs, uint pc_limit) {
3534
3535 int pc_digits = 3; // #chars required for pc
3536 int sb_chars = 3; // #chars for "start bundle" indicator
3537 int tab_size = 8;
3538 if (pcs != nullptr) {
3539 int max_pc = 0;
3540 for (uint i = 0; i < pc_limit; i++) {
3541 max_pc = (max_pc < pcs[i]) ? pcs[i] : max_pc;
3542 }
3543 pc_digits = ((max_pc < 4096) ? 3 : ((max_pc < 65536) ? 4 : ((max_pc < 65536*256) ? 6 : 8))); // #chars required for pc
3544 }
3545 int prefix_len = ((pc_digits + sb_chars + tab_size - 1)/tab_size)*tab_size;
3546
3547 bool cut_short = false;
3548 st->print_cr("#");
3549 st->print("# "); C->tf()->dump_on(st); st->cr();
3550 st->print_cr("#");
3551
3552 // For all blocks
3553 int pc = 0x0; // Program counter
3554 char starts_bundle = ' ';
3555 C->regalloc()->dump_frame();
3556
3557 Node *n = nullptr;
3558 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
3559 if (VMThread::should_terminate()) {
3560 cut_short = true;
3561 break;
3562 }
3563 Block* block = C->cfg()->get_block(i);
3564 if (block->is_connector() && !Verbose) {
3565 continue;
3566 }
3567 n = block->head();
3568 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3569 pc = pcs[n->_idx];
3570 st->print("%*.*x", pc_digits, pc_digits, pc);
3571 }
3572 st->fill_to(prefix_len);
3573 block->dump_head(C->cfg(), st);
3574 if (block->is_connector()) {
3575 st->fill_to(prefix_len);
3576 st->print_cr("# Empty connector block");
3577 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
3578 st->fill_to(prefix_len);
3579 st->print_cr("# Block is sole successor of call");
3580 }
3581
3582 // For all instructions
3583 Node *delay = nullptr;
3584 for (uint j = 0; j < block->number_of_nodes(); j++) {
3585 if (VMThread::should_terminate()) {
3586 cut_short = true;
3587 break;
3588 }
3589 n = block->get_node(j);
3590 if (valid_bundle_info(n)) {
3591 Bundle* bundle = node_bundling(n);
3592 if (bundle->used_in_unconditional_delay()) {
3593 delay = n;
3594 continue;
3595 }
3596 if (bundle->starts_bundle()) {
3597 starts_bundle = '+';
3598 }
3599 }
3600
3601 if (WizardMode) {
3602 n->dump();
3603 }
3604
3605 if( !n->is_Region() && // Dont print in the Assembly
3606 !n->is_Phi() && // a few noisely useless nodes
3607 !n->is_Proj() &&
3608 !n->is_MachTemp() &&
3609 !n->is_SafePointScalarObject() &&
3610 !n->is_Catch() && // Would be nice to print exception table targets
3611 !n->is_MergeMem() && // Not very interesting
3612 !n->is_top() && // Debug info table constants
3613 !(n->is_Con() && !n->is_Mach())// Debug info table constants
3614 ) {
3615 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3616 pc = pcs[n->_idx];
3617 st->print("%*.*x", pc_digits, pc_digits, pc);
3618 } else {
3619 st->fill_to(pc_digits);
3620 }
3621 st->print(" %c ", starts_bundle);
3622 starts_bundle = ' ';
3623 st->fill_to(prefix_len);
3624 n->format(C->regalloc(), st);
3625 st->cr();
3626 }
3627
3628 // If we have an instruction with a delay slot, and have seen a delay,
3629 // then back up and print it
3630 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
3631 // Coverity finding - Explicit null dereferenced.
3632 guarantee(delay != nullptr, "no unconditional delay instruction");
3633 if (WizardMode) delay->dump();
3634
3635 if (node_bundling(delay)->starts_bundle())
3636 starts_bundle = '+';
3637 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3638 pc = pcs[n->_idx];
3639 st->print("%*.*x", pc_digits, pc_digits, pc);
3640 } else {
3641 st->fill_to(pc_digits);
3642 }
3643 st->print(" %c ", starts_bundle);
3644 starts_bundle = ' ';
3645 st->fill_to(prefix_len);
3646 delay->format(C->regalloc(), st);
3647 st->cr();
3648 delay = nullptr;
3649 }
3650
3651 // Dump the exception table as well
3652 if( n->is_Catch() && (Verbose || WizardMode) ) {
3653 // Print the exception table for this offset
3654 _handler_table.print_subtable_for(pc);
3655 }
3656 st->bol(); // Make sure we start on a new line
3657 }
3658 st->cr(); // one empty line between blocks
3659 assert(cut_short || delay == nullptr, "no unconditional delay branch");
3660 } // End of per-block dump
3661
3662 if (cut_short) st->print_cr("*** disassembly is cut short ***");
3663 }
3664 #endif
3665
3666 #ifndef PRODUCT
3667 void PhaseOutput::print_statistics() {
3668 Scheduling::print_statistics();
3669 }
3670 #endif
3671
3672 int PhaseOutput::max_inst_size() {
3673 if (AOTCodeCache::maybe_dumping_code()) {
3674 // See the comment in output.hpp.
3675 return 16384;
3676 } else {
3677 return mainline_MAX_inst_size;
3678 }
3679 }
3680
3681 int PhaseOutput::max_inst_gcstub_size() {
3682 assert(mainline_MAX_inst_size <= max_inst_size(), "Sanity");
3683 return mainline_MAX_inst_size;
3684 }