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/c2compiler.hpp"
40 #include "opto/c2_MacroAssembler.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 !GenerateSynchronizationCode,
1079 "monitors must always exist for synchronized methods");
1080
1081 // Build the growable array of ScopeValues for exp stack
1082 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
1083
1084 // Loop over monitors and insert into array
1085 for (idx = 0; idx < num_mon; idx++) {
1086 // Grab the node that defines this monitor
1087 Node* box_node = sfn->monitor_box(jvms, idx);
1088 Node* obj_node = sfn->monitor_obj(jvms, idx);
1089
1090 // Create ScopeValue for object
1091 ScopeValue *scval = nullptr;
1092
1093 if (obj_node->is_SafePointScalarObject()) {
1094 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
1095 scval = PhaseOutput::sv_for_node_id(objs, spobj->_idx);
1096 if (scval == nullptr) {
1097 const Type *t = spobj->bottom_type();
1098 ciKlass* cik = t->is_oopptr()->exact_klass();
1099 assert(cik->is_instance_klass() ||
1100 cik->is_array_klass(), "Not supported allocation.");
1101 ObjectValue* sv = new ObjectValue(spobj->_idx,
1102 new ConstantOopWriteValue(cik->java_mirror()->constant_encoding()));
1103 PhaseOutput::set_sv_for_object_node(objs, sv);
1104
1105 uint first_ind = spobj->first_index(youngest_jvms);
1106 for (uint i = 0; i < spobj->n_fields(); i++) {
1107 Node* fld_node = sfn->in(first_ind+i);
1108 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
1109 }
1110 scval = sv;
1111 }
1112 } else if (obj_node->is_SafePointScalarMerge()) {
1113 SafePointScalarMergeNode* smerge = obj_node->as_SafePointScalarMerge();
1114 ObjectMergeValue* mv = (ObjectMergeValue*) sv_for_node_id(objs, smerge->_idx);
1115
1116 if (mv == nullptr) {
1117 GrowableArray<ScopeValue*> deps;
1118
1119 int merge_pointer_idx = smerge->merge_pointer_idx(youngest_jvms);
1120 FillLocArray(0, sfn, sfn->in(merge_pointer_idx), &deps, objs);
1121 assert(deps.length() == 1, "missing value");
1122
1123 int selector_idx = smerge->selector_idx(youngest_jvms);
1124 FillLocArray(1, nullptr, sfn->in(selector_idx), &deps, nullptr);
1125 assert(deps.length() == 2, "missing value");
1126
1127 mv = new ObjectMergeValue(smerge->_idx, deps.at(0), deps.at(1));
1128 set_sv_for_object_node(objs, mv);
1129
1130 for (uint i = 1; i < smerge->req(); i++) {
1131 Node* obj_node = smerge->in(i);
1132 int idx = mv->possible_objects()->length();
1133 (void)FillLocArray(idx, sfn, obj_node, mv->possible_objects(), objs);
1134
1135 // By default ObjectValues that are in 'possible_objects' are not root objects.
1136 // They will be marked as root later if they are directly referenced in a JVMS.
1137 assert(mv->possible_objects()->length() > idx, "Didn't add entry to possible_objects?!");
1138 assert(mv->possible_objects()->at(idx)->is_object(), "Entries in possible_objects should be ObjectValue.");
1139 mv->possible_objects()->at(idx)->as_ObjectValue()->set_root(false);
1140 }
1141 }
1142 scval = mv;
1143 } else if (!obj_node->is_Con()) {
1144 OptoReg::Name obj_reg = C->regalloc()->get_reg_first(obj_node);
1145 if( obj_node->bottom_type()->base() == Type::NarrowOop ) {
1146 scval = new_loc_value( C->regalloc(), obj_reg, Location::narrowoop );
1147 } else {
1148 scval = new_loc_value( C->regalloc(), obj_reg, Location::oop );
1149 }
1150 } else {
1151 const TypePtr *tp = obj_node->get_ptr_type();
1152 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding());
1153 }
1154
1155 OptoReg::Name box_reg = BoxLockNode::reg(box_node);
1156 Location basic_lock = Location::new_stk_loc(Location::normal,C->regalloc()->reg2offset(box_reg));
1157 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated());
1158 monarray->append(new MonitorValue(scval, basic_lock, eliminated));
1159 }
1160
1161 // Mark ObjectValue nodes as root nodes if they are directly
1162 // referenced in the JVMS.
1163 for (int i = 0; i < objs->length(); i++) {
1164 ScopeValue* sv = objs->at(i);
1165 if (sv->is_object_merge()) {
1166 ObjectMergeValue* merge = sv->as_ObjectMergeValue();
1167
1168 for (int j = 0; j< merge->possible_objects()->length(); j++) {
1169 ObjectValue* ov = merge->possible_objects()->at(j)->as_ObjectValue();
1170 if (ov->is_root()) {
1171 // Already flagged as 'root' by something else. We shouldn't change it
1172 // to non-root in a younger JVMS because it may need to be alive in
1173 // a younger JVMS.
1174 } else {
1175 bool is_root = locarray->contains(ov) ||
1176 exparray->contains(ov) ||
1177 contains_as_owner(monarray, ov) ||
1178 contains_as_scalarized_obj(jvms, sfn, objs, ov);
1179 ov->set_root(is_root);
1180 }
1181 }
1182 }
1183 }
1184
1185 // We dump the object pool first, since deoptimization reads it in first.
1186 C->debug_info()->dump_object_pool(objs);
1187
1188 // Build first class objects to pass to scope
1189 DebugToken *locvals = C->debug_info()->create_scope_values(locarray);
1190 DebugToken *expvals = C->debug_info()->create_scope_values(exparray);
1191 DebugToken *monvals = C->debug_info()->create_monitor_values(monarray);
1192
1193 // Make method available for all Safepoints
1194 ciMethod* scope_method = method ? method : C->method();
1195 // Describe the scope here
1196 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
1197 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
1198 // Now we can describe the scope.
1199 methodHandle null_mh;
1200 bool rethrow_exception = false;
1201 C->debug_info()->describe_scope(
1202 safepoint_pc_offset,
1203 null_mh,
1204 scope_method,
1205 jvms->bci(),
1206 jvms->should_reexecute(),
1207 rethrow_exception,
1208 is_method_handle_invoke,
1209 return_oop,
1210 has_ea_local_in_scope,
1211 arg_escape,
1212 locvals,
1213 expvals,
1214 monvals
1215 );
1216 } // End jvms loop
1217
1218 // Mark the end of the scope set.
1219 C->debug_info()->end_safepoint(safepoint_pc_offset);
1220 }
1221
1222
1223
1224 // A simplified version of Process_OopMap_Node, to handle non-safepoints.
1225 class NonSafepointEmitter {
1226 Compile* C;
1227 JVMState* _pending_jvms;
1228 int _pending_offset;
1229
1230 void emit_non_safepoint();
1231
1232 public:
1233 NonSafepointEmitter(Compile* compile) {
1234 this->C = compile;
1235 _pending_jvms = nullptr;
1236 _pending_offset = 0;
1237 }
1238
1239 void observe_instruction(Node* n, int pc_offset) {
1240 if (!C->debug_info()->recording_non_safepoints()) return;
1241
1242 Node_Notes* nn = C->node_notes_at(n->_idx);
1243 if (nn == nullptr || nn->jvms() == nullptr) return;
1244 if (_pending_jvms != nullptr &&
1245 _pending_jvms->same_calls_as(nn->jvms())) {
1246 // Repeated JVMS? Stretch it up here.
1247 _pending_offset = pc_offset;
1248 } else {
1249 if (_pending_jvms != nullptr &&
1250 _pending_offset < pc_offset) {
1251 emit_non_safepoint();
1252 }
1253 _pending_jvms = nullptr;
1254 if (pc_offset > C->debug_info()->last_pc_offset()) {
1255 // This is the only way _pending_jvms can become non-null:
1256 _pending_jvms = nn->jvms();
1257 _pending_offset = pc_offset;
1258 }
1259 }
1260 }
1261
1262 // Stay out of the way of real safepoints:
1263 void observe_safepoint(JVMState* jvms, int pc_offset) {
1264 if (_pending_jvms != nullptr &&
1265 !_pending_jvms->same_calls_as(jvms) &&
1266 _pending_offset < pc_offset) {
1267 emit_non_safepoint();
1268 }
1269 _pending_jvms = nullptr;
1270 }
1271
1272 void flush_at_end() {
1273 if (_pending_jvms != nullptr) {
1274 emit_non_safepoint();
1275 }
1276 _pending_jvms = nullptr;
1277 }
1278 };
1279
1280 void NonSafepointEmitter::emit_non_safepoint() {
1281 JVMState* youngest_jvms = _pending_jvms;
1282 int pc_offset = _pending_offset;
1283
1284 // Clear it now:
1285 _pending_jvms = nullptr;
1286
1287 DebugInformationRecorder* debug_info = C->debug_info();
1288 assert(debug_info->recording_non_safepoints(), "sanity");
1289
1290 debug_info->add_non_safepoint(pc_offset);
1291 int max_depth = youngest_jvms->depth();
1292
1293 // Visit scopes from oldest to youngest.
1294 for (int depth = 1; depth <= max_depth; depth++) {
1295 JVMState* jvms = youngest_jvms->of_depth(depth);
1296 ciMethod* method = jvms->has_method() ? jvms->method() : nullptr;
1297 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest");
1298 methodHandle null_mh;
1299 debug_info->describe_scope(pc_offset, null_mh, method, jvms->bci(), jvms->should_reexecute());
1300 }
1301
1302 // Mark the end of the scope set.
1303 debug_info->end_non_safepoint(pc_offset);
1304 }
1305
1306 //------------------------------init_buffer------------------------------------
1307 void PhaseOutput::estimate_buffer_size(int& const_req) {
1308
1309 // Set the initially allocated size
1310 const_req = initial_const_capacity;
1311
1312 // The extra spacing after the code is necessary on some platforms.
1313 // Sometimes we need to patch in a jump after the last instruction,
1314 // if the nmethod has been deoptimized. (See 4932387, 4894843.)
1315
1316 // Compute the byte offset where we can store the deopt pc.
1317 if (C->fixed_slots() != 0) {
1318 _orig_pc_slot_offset_in_bytes = C->regalloc()->reg2offset(OptoReg::stack2reg(_orig_pc_slot));
1319 }
1320
1321 // Compute prolog code size
1322 _frame_slots = OptoReg::reg2stack(C->matcher()->_old_SP) + C->regalloc()->_framesize;
1323 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check");
1324
1325 if (C->has_mach_constant_base_node()) {
1326 uint add_size = 0;
1327 // Fill the constant table.
1328 // Note: This must happen before shorten_branches.
1329 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1330 Block* b = C->cfg()->get_block(i);
1331
1332 for (uint j = 0; j < b->number_of_nodes(); j++) {
1333 Node* n = b->get_node(j);
1334
1335 // If the node is a MachConstantNode evaluate the constant
1336 // value section.
1337 if (n->is_MachConstant()) {
1338 MachConstantNode* machcon = n->as_MachConstant();
1339 machcon->eval_constant(C);
1340 } else if (n->is_Mach()) {
1341 // On Power there are more nodes that issue constants.
1342 add_size += (n->as_Mach()->ins_num_consts() * 8);
1343 }
1344 }
1345 }
1346
1347 // Calculate the offsets of the constants and the size of the
1348 // constant table (including the padding to the next section).
1349 constant_table().calculate_offsets_and_size();
1350 const_req = constant_table().alignment() + constant_table().size() + add_size;
1351 }
1352
1353 // Initialize the space for the BufferBlob used to find and verify
1354 // instruction size in MachNode::emit_size()
1355 init_scratch_buffer_blob(const_req);
1356 }
1357
1358 CodeBuffer* PhaseOutput::init_buffer() {
1359 int stub_req = _buf_sizes._stub;
1360 int code_req = _buf_sizes._code;
1361 int const_req = _buf_sizes._const;
1362
1363 int pad_req = NativeCall::byte_size();
1364
1365 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1366 stub_req += bs->estimate_stub_size();
1367
1368 // nmethod and CodeBuffer count stubs & constants as part of method's code.
1369 // class HandlerImpl is platform-specific and defined in the *.ad files.
1370 int exception_handler_req = HandlerImpl::size_exception_handler() + MAX_stubs_size; // add marginal slop for handler
1371 int deopt_handler_req = HandlerImpl::size_deopt_handler() + MAX_stubs_size; // add marginal slop for handler
1372 stub_req += MAX_stubs_size; // ensure per-stub margin
1373 code_req += max_inst_size(); // ensure per-instruction margin
1374
1375 if (StressCodeBuffers)
1376 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion
1377
1378 int total_req =
1379 const_req +
1380 code_req +
1381 pad_req +
1382 stub_req +
1383 exception_handler_req +
1384 deopt_handler_req; // deopt handler
1385
1386 if (C->has_method_handle_invokes())
1387 total_req += deopt_handler_req; // deopt MH handler
1388
1389 CodeBuffer* cb = code_buffer();
1390 cb->set_const_section_alignment(constant_table().alignment());
1391 cb->initialize(total_req, _buf_sizes._reloc);
1392
1393 // Have we run out of code space?
1394 if ((cb->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1395 C->record_failure("CodeCache is full");
1396 return nullptr;
1397 }
1398 // Configure the code buffer.
1399 cb->initialize_consts_size(const_req);
1400 cb->initialize_stubs_size(stub_req);
1401 cb->initialize_oop_recorder(C->env()->oop_recorder());
1402
1403 // fill in the nop array for bundling computations
1404 MachNode *_nop_list[Bundle::_nop_count];
1405 Bundle::initialize_nops(_nop_list);
1406
1407 return cb;
1408 }
1409
1410 //------------------------------fill_buffer------------------------------------
1411 void PhaseOutput::fill_buffer(C2_MacroAssembler* masm, uint* blk_starts) {
1412 // blk_starts[] contains offsets calculated during short branches processing,
1413 // offsets should not be increased during following steps.
1414
1415 // Compute the size of first NumberOfLoopInstrToAlign instructions at head
1416 // of a loop. It is used to determine the padding for loop alignment.
1417 Compile::TracePhase tp(_t_fillBuffer);
1418
1419 compute_loop_first_inst_sizes();
1420
1421 // Create oopmap set.
1422 _oop_map_set = new OopMapSet();
1423
1424 // !!!!! This preserves old handling of oopmaps for now
1425 C->debug_info()->set_oopmaps(_oop_map_set);
1426
1427 uint nblocks = C->cfg()->number_of_blocks();
1428 // Count and start of implicit null check instructions
1429 uint inct_cnt = 0;
1430 uint* inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1431
1432 // Count and start of calls
1433 uint* call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1434
1435 uint return_offset = 0;
1436 int nop_size = (new MachNopNode())->size(C->regalloc());
1437
1438 int previous_offset = 0;
1439 int current_offset = 0;
1440 int last_call_offset = -1;
1441 int last_avoid_back_to_back_offset = -1;
1442 #ifdef ASSERT
1443 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks);
1444 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
1445 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
1446 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks);
1447 #endif
1448
1449 // Create an array of unused labels, one for each basic block, if printing is enabled
1450 #if defined(SUPPORT_OPTO_ASSEMBLY)
1451 int* node_offsets = nullptr;
1452 uint node_offset_limit = C->unique();
1453
1454 if (C->print_assembly()) {
1455 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit);
1456 }
1457 if (node_offsets != nullptr) {
1458 // We need to initialize. Unused array elements may contain garbage and mess up PrintOptoAssembly.
1459 memset(node_offsets, 0, node_offset_limit*sizeof(int));
1460 }
1461 #endif
1462
1463 NonSafepointEmitter non_safepoints(C); // emit non-safepoints lazily
1464
1465 // Emit the constant table.
1466 if (C->has_mach_constant_base_node()) {
1467 if (!constant_table().emit(masm)) {
1468 C->record_failure("consts section overflow");
1469 return;
1470 }
1471 }
1472
1473 // Create an array of labels, one for each basic block
1474 Label* blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1);
1475 for (uint i = 0; i <= nblocks; i++) {
1476 blk_labels[i].init();
1477 }
1478
1479 // Now fill in the code buffer
1480 Node* delay_slot = nullptr;
1481 for (uint i = 0; i < nblocks; i++) {
1482 Block* block = C->cfg()->get_block(i);
1483 _block = block;
1484 Node* head = block->head();
1485
1486 // If this block needs to start aligned (i.e, can be reached other
1487 // than by falling-thru from the previous block), then force the
1488 // start of a new bundle.
1489 if (Pipeline::requires_bundling() && starts_bundle(head)) {
1490 masm->code()->flush_bundle(true);
1491 }
1492
1493 #ifdef ASSERT
1494 if (!block->is_connector()) {
1495 stringStream st;
1496 block->dump_head(C->cfg(), &st);
1497 masm->block_comment(st.freeze());
1498 }
1499 jmp_target[i] = 0;
1500 jmp_offset[i] = 0;
1501 jmp_size[i] = 0;
1502 jmp_rule[i] = 0;
1503 #endif
1504 int blk_offset = current_offset;
1505
1506 // Define the label at the beginning of the basic block
1507 masm->bind(blk_labels[block->_pre_order]);
1508
1509 uint last_inst = block->number_of_nodes();
1510
1511 // Emit block normally, except for last instruction.
1512 // Emit means "dump code bits into code buffer".
1513 for (uint j = 0; j<last_inst; j++) {
1514 _index = j;
1515
1516 // Get the node
1517 Node* n = block->get_node(j);
1518
1519 // See if delay slots are supported
1520 if (valid_bundle_info(n) && node_bundling(n)->used_in_unconditional_delay()) {
1521 assert(delay_slot == nullptr, "no use of delay slot node");
1522 assert(n->size(C->regalloc()) == Pipeline::instr_unit_size(), "delay slot instruction wrong size");
1523
1524 delay_slot = n;
1525 continue;
1526 }
1527
1528 // If this starts a new instruction group, then flush the current one
1529 // (but allow split bundles)
1530 if (Pipeline::requires_bundling() && starts_bundle(n))
1531 masm->code()->flush_bundle(false);
1532
1533 // Special handling for SafePoint/Call Nodes
1534 bool is_mcall = false;
1535 if (n->is_Mach()) {
1536 MachNode *mach = n->as_Mach();
1537 is_mcall = n->is_MachCall();
1538 bool is_sfn = n->is_MachSafePoint();
1539
1540 // If this requires all previous instructions be flushed, then do so
1541 if (is_sfn || is_mcall || mach->alignment_required() != 1) {
1542 masm->code()->flush_bundle(true);
1543 current_offset = masm->offset();
1544 }
1545
1546 // A padding may be needed again since a previous instruction
1547 // could be moved to delay slot.
1548
1549 // align the instruction if necessary
1550 int padding = mach->compute_padding(current_offset);
1551 // Make sure safepoint node for polling is distinct from a call's
1552 // return by adding a nop if needed.
1553 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) {
1554 padding = nop_size;
1555 }
1556 if (padding == 0 && mach->avoid_back_to_back(MachNode::AVOID_BEFORE) &&
1557 current_offset == last_avoid_back_to_back_offset) {
1558 // Avoid back to back some instructions.
1559 padding = nop_size;
1560 }
1561
1562 if (padding > 0) {
1563 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size");
1564 int nops_cnt = padding / nop_size;
1565 MachNode *nop = new MachNopNode(nops_cnt);
1566 block->insert_node(nop, j++);
1567 last_inst++;
1568 C->cfg()->map_node_to_block(nop, block);
1569 // Ensure enough space.
1570 masm->code()->insts()->maybe_expand_to_ensure_remaining(max_inst_size());
1571 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1572 C->record_failure("CodeCache is full");
1573 return;
1574 }
1575 nop->emit(masm, C->regalloc());
1576 masm->code()->flush_bundle(true);
1577 current_offset = masm->offset();
1578 }
1579
1580 bool observe_safepoint = is_sfn;
1581 // Remember the start of the last call in a basic block
1582 if (is_mcall) {
1583 MachCallNode *mcall = mach->as_MachCall();
1584
1585 // This destination address is NOT PC-relative
1586 mcall->method_set((intptr_t)mcall->entry_point());
1587
1588 // Save the return address
1589 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset();
1590
1591 observe_safepoint = mcall->guaranteed_safepoint();
1592 }
1593
1594 // sfn will be valid whenever mcall is valid now because of inheritance
1595 if (observe_safepoint) {
1596 // Handle special safepoint nodes for synchronization
1597 if (!is_mcall) {
1598 MachSafePointNode *sfn = mach->as_MachSafePoint();
1599 // !!!!! Stubs only need an oopmap right now, so bail out
1600 if (sfn->jvms()->method() == nullptr) {
1601 // Write the oopmap directly to the code blob??!!
1602 continue;
1603 }
1604 } // End synchronization
1605
1606 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1607 current_offset);
1608 Process_OopMap_Node(mach, current_offset);
1609 } // End if safepoint
1610
1611 // If this is a null check, then add the start of the previous instruction to the list
1612 else if( mach->is_MachNullCheck() ) {
1613 inct_starts[inct_cnt++] = previous_offset;
1614 }
1615
1616 // If this is a branch, then fill in the label with the target BB's label
1617 else if (mach->is_MachBranch()) {
1618 // This requires the TRUE branch target be in succs[0]
1619 uint block_num = block->non_connector_successor(0)->_pre_order;
1620
1621 // Try to replace long branch if delay slot is not used,
1622 // it is mostly for back branches since forward branch's
1623 // distance is not updated yet.
1624 bool delay_slot_is_used = valid_bundle_info(n) &&
1625 C->output()->node_bundling(n)->use_unconditional_delay();
1626 if (!delay_slot_is_used && mach->may_be_short_branch()) {
1627 assert(delay_slot == nullptr, "not expecting delay slot node");
1628 int br_size = n->size(C->regalloc());
1629 int offset = blk_starts[block_num] - current_offset;
1630 if (block_num >= i) {
1631 // Current and following block's offset are not
1632 // finalized yet, adjust distance by the difference
1633 // between calculated and final offsets of current block.
1634 offset -= (blk_starts[i] - blk_offset);
1635 }
1636 // In the following code a nop could be inserted before
1637 // the branch which will increase the backward distance.
1638 bool needs_padding = (current_offset == last_avoid_back_to_back_offset);
1639 if (needs_padding && offset <= 0)
1640 offset -= nop_size;
1641
1642 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
1643 // We've got a winner. Replace this branch.
1644 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
1645
1646 // Update the jmp_size.
1647 int new_size = replacement->size(C->regalloc());
1648 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller");
1649 // Insert padding between avoid_back_to_back branches.
1650 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
1651 MachNode *nop = new MachNopNode();
1652 block->insert_node(nop, j++);
1653 C->cfg()->map_node_to_block(nop, block);
1654 last_inst++;
1655 nop->emit(masm, C->regalloc());
1656 masm->code()->flush_bundle(true);
1657 current_offset = masm->offset();
1658 }
1659 #ifdef ASSERT
1660 jmp_target[i] = block_num;
1661 jmp_offset[i] = current_offset - blk_offset;
1662 jmp_size[i] = new_size;
1663 jmp_rule[i] = mach->rule();
1664 #endif
1665 block->map_node(replacement, j);
1666 mach->subsume_by(replacement, C);
1667 n = replacement;
1668 mach = replacement;
1669 }
1670 }
1671 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num );
1672 } else if (mach->ideal_Opcode() == Op_Jump) {
1673 for (uint h = 0; h < block->_num_succs; h++) {
1674 Block* succs_block = block->_succs[h];
1675 for (uint j = 1; j < succs_block->num_preds(); j++) {
1676 Node* jpn = succs_block->pred(j);
1677 if (jpn->is_JumpProj() && jpn->in(0) == mach) {
1678 uint block_num = succs_block->non_connector()->_pre_order;
1679 Label *blkLabel = &blk_labels[block_num];
1680 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel);
1681 }
1682 }
1683 }
1684 } else if (!n->is_Proj()) {
1685 // Remember the beginning of the previous instruction, in case
1686 // it's followed by a flag-kill and a null-check. Happens on
1687 // Intel all the time, with add-to-memory kind of opcodes.
1688 previous_offset = current_offset;
1689 }
1690
1691 // Not an else-if!
1692 // If this is a trap based cmp then add its offset to the list.
1693 if (mach->is_TrapBasedCheckNode()) {
1694 inct_starts[inct_cnt++] = current_offset;
1695 }
1696 }
1697
1698 // Verify that there is sufficient space remaining
1699 masm->code()->insts()->maybe_expand_to_ensure_remaining(max_inst_size());
1700 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1701 C->record_failure("CodeCache is full");
1702 return;
1703 }
1704
1705 // Save the offset for the listing
1706 #if defined(SUPPORT_OPTO_ASSEMBLY)
1707 if ((node_offsets != nullptr) && (n->_idx < node_offset_limit)) {
1708 node_offsets[n->_idx] = masm->offset();
1709 }
1710 #endif
1711 assert(!C->failing_internal() || C->failure_is_artificial(), "Should not reach here if failing.");
1712
1713 // "Normal" instruction case
1714 DEBUG_ONLY(uint instr_offset = masm->offset());
1715 n->emit(masm, C->regalloc());
1716 current_offset = masm->offset();
1717
1718 // Above we only verified that there is enough space in the instruction section.
1719 // However, the instruction may emit stubs that cause code buffer expansion.
1720 // Bail out here if expansion failed due to a lack of code cache space.
1721 if (C->failing()) {
1722 return;
1723 }
1724
1725 assert(!is_mcall || (call_returns[block->_pre_order] <= (uint)current_offset),
1726 "ret_addr_offset() not within emitted code");
1727
1728 #ifdef ASSERT
1729 uint n_size = n->size(C->regalloc());
1730 if (n_size < (current_offset-instr_offset)) {
1731 MachNode* mach = n->as_Mach();
1732 n->dump();
1733 mach->dump_format(C->regalloc(), tty);
1734 tty->print_cr(" n_size (%d), current_offset (%d), instr_offset (%d)", n_size, current_offset, instr_offset);
1735 Disassembler::decode(masm->code()->insts_begin() + instr_offset, masm->code()->insts_begin() + current_offset + 1, tty);
1736 tty->print_cr(" ------------------- ");
1737 BufferBlob* blob = this->scratch_buffer_blob();
1738 address blob_begin = blob->content_begin();
1739 Disassembler::decode(blob_begin, blob_begin + n_size + 1, tty);
1740 assert(false, "wrong size of mach node");
1741 }
1742 #endif
1743 non_safepoints.observe_instruction(n, current_offset);
1744
1745 // mcall is last "call" that can be a safepoint
1746 // record it so we can see if a poll will directly follow it
1747 // in which case we'll need a pad to make the PcDesc sites unique
1748 // see 5010568. This can be slightly inaccurate but conservative
1749 // in the case that return address is not actually at current_offset.
1750 // This is a small price to pay.
1751
1752 if (is_mcall) {
1753 last_call_offset = current_offset;
1754 }
1755
1756 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
1757 // Avoid back to back some instructions.
1758 last_avoid_back_to_back_offset = current_offset;
1759 }
1760
1761 // See if this instruction has a delay slot
1762 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
1763 guarantee(delay_slot != nullptr, "expecting delay slot node");
1764
1765 // Back up 1 instruction
1766 masm->code()->set_insts_end(masm->code()->insts_end() - Pipeline::instr_unit_size());
1767
1768 // Save the offset for the listing
1769 #if defined(SUPPORT_OPTO_ASSEMBLY)
1770 if ((node_offsets != nullptr) && (delay_slot->_idx < node_offset_limit)) {
1771 node_offsets[delay_slot->_idx] = masm->offset();
1772 }
1773 #endif
1774
1775 // Support a SafePoint in the delay slot
1776 if (delay_slot->is_MachSafePoint()) {
1777 MachNode *mach = delay_slot->as_Mach();
1778 // !!!!! Stubs only need an oopmap right now, so bail out
1779 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == nullptr) {
1780 // Write the oopmap directly to the code blob??!!
1781 delay_slot = nullptr;
1782 continue;
1783 }
1784
1785 int adjusted_offset = current_offset - Pipeline::instr_unit_size();
1786 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1787 adjusted_offset);
1788 // Generate an OopMap entry
1789 Process_OopMap_Node(mach, adjusted_offset);
1790 }
1791
1792 // Insert the delay slot instruction
1793 delay_slot->emit(masm, C->regalloc());
1794
1795 // Don't reuse it
1796 delay_slot = nullptr;
1797 }
1798
1799 } // End for all instructions in block
1800
1801 // If the next block is the top of a loop, pad this block out to align
1802 // the loop top a little. Helps prevent pipe stalls at loop back branches.
1803 if (i < nblocks-1) {
1804 Block *nb = C->cfg()->get_block(i + 1);
1805 int padding = nb->alignment_padding(current_offset);
1806 if( padding > 0 ) {
1807 MachNode *nop = new MachNopNode(padding / nop_size);
1808 block->insert_node(nop, block->number_of_nodes());
1809 C->cfg()->map_node_to_block(nop, block);
1810 nop->emit(masm, C->regalloc());
1811 current_offset = masm->offset();
1812 }
1813 }
1814 // Verify that the distance for generated before forward
1815 // short branches is still valid.
1816 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size");
1817
1818 // Save new block start offset
1819 blk_starts[i] = blk_offset;
1820 } // End of for all blocks
1821 blk_starts[nblocks] = current_offset;
1822
1823 non_safepoints.flush_at_end();
1824
1825 // Offset too large?
1826 if (C->failing()) return;
1827
1828 // Define a pseudo-label at the end of the code
1829 masm->bind( blk_labels[nblocks] );
1830
1831 // Compute the size of the first block
1832 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos();
1833
1834 #ifdef ASSERT
1835 for (uint i = 0; i < nblocks; i++) { // For all blocks
1836 if (jmp_target[i] != 0) {
1837 int br_size = jmp_size[i];
1838 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
1839 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
1840 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]);
1841 assert(false, "Displacement too large for short jmp");
1842 }
1843 }
1844 }
1845 #endif
1846
1847 if (!masm->code()->finalize_stubs()) {
1848 C->record_failure("CodeCache is full");
1849 return;
1850 }
1851
1852 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1853 bs->emit_stubs(*masm->code());
1854 if (C->failing()) return;
1855
1856 // Fill in stubs.
1857 assert(masm->inst_mark() == nullptr, "should be.");
1858 _stub_list.emit(*masm);
1859 if (C->failing()) return;
1860
1861 #ifndef PRODUCT
1862 // Information on the size of the method, without the extraneous code
1863 Scheduling::increment_method_size(masm->offset());
1864 #endif
1865
1866 // ------------------
1867 // Fill in exception table entries.
1868 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels);
1869
1870 // Only java methods have exception handlers and deopt handlers
1871 // class HandlerImpl is platform-specific and defined in the *.ad files.
1872 if (C->method()) {
1873 // Emit the exception handler code.
1874 _code_offsets.set_value(CodeOffsets::Exceptions, HandlerImpl::emit_exception_handler(masm));
1875 if (C->failing()) {
1876 return; // CodeBuffer::expand failed
1877 }
1878 // Emit the deopt handler code.
1879 _code_offsets.set_value(CodeOffsets::Deopt, HandlerImpl::emit_deopt_handler(masm));
1880
1881 // Emit the MethodHandle deopt handler code (if required).
1882 if (C->has_method_handle_invokes() && !C->failing()) {
1883 // We can use the same code as for the normal deopt handler, we
1884 // just need a different entry point address.
1885 _code_offsets.set_value(CodeOffsets::DeoptMH, HandlerImpl::emit_deopt_handler(masm));
1886 }
1887 }
1888
1889 // One last check for failed CodeBuffer::expand:
1890 if ((masm->code()->blob() == nullptr) || (!CompileBroker::should_compile_new_jobs())) {
1891 C->record_failure("CodeCache is full");
1892 return;
1893 }
1894
1895 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) || defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_OPTO_ASSEMBLY)
1896 if (C->print_assembly()) {
1897 tty->cr();
1898 tty->print_cr("============================= C2-compiled nmethod ==============================");
1899 }
1900 #endif
1901
1902 #if defined(SUPPORT_OPTO_ASSEMBLY)
1903 // Dump the assembly code, including basic-block numbers
1904 if (C->print_assembly()) {
1905 ttyLocker ttyl; // keep the following output all in one block
1906 if (!VMThread::should_terminate()) { // test this under the tty lock
1907 // print_metadata and dump_asm may safepoint which makes us loose the ttylock.
1908 // We call them first and write to a stringStream, then we retake the lock to
1909 // make sure the end tag is coherent, and that xmlStream->pop_tag is done thread safe.
1910 ResourceMark rm;
1911 stringStream method_metadata_str;
1912 if (C->method() != nullptr) {
1913 C->method()->print_metadata(&method_metadata_str);
1914 }
1915 stringStream dump_asm_str;
1916 dump_asm_on(&dump_asm_str, node_offsets, node_offset_limit);
1917
1918 NoSafepointVerifier nsv;
1919 ttyLocker ttyl2;
1920 // This output goes directly to the tty, not the compiler log.
1921 // To enable tools to match it up with the compilation activity,
1922 // be sure to tag this tty output with the compile ID.
1923 if (xtty != nullptr) {
1924 xtty->head("opto_assembly compile_id='%d'%s", C->compile_id(),
1925 C->is_osr_compilation() ? " compile_kind='osr'" :
1926 (C->for_preload() ? " compile_kind='AP'" : ""));
1927 }
1928 if (C->method() != nullptr) {
1929 tty->print_cr("----------------------- MetaData before Compile_id = %d ------------------------", C->compile_id());
1930 tty->print_raw(method_metadata_str.freeze());
1931 } else if (C->stub_name() != nullptr) {
1932 tty->print_cr("----------------------------- RuntimeStub %s -------------------------------", C->stub_name());
1933 }
1934 tty->cr();
1935 tty->print_cr("------------------------ OptoAssembly for Compile_id = %d -----------------------", C->compile_id());
1936 tty->print_raw(dump_asm_str.freeze());
1937 tty->print_cr("--------------------------------------------------------------------------------");
1938 if (xtty != nullptr) {
1939 xtty->tail("opto_assembly");
1940 }
1941 }
1942 }
1943 #endif
1944 }
1945
1946 void PhaseOutput::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) {
1947 _inc_table.set_size(cnt);
1948
1949 uint inct_cnt = 0;
1950 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1951 Block* block = C->cfg()->get_block(i);
1952 Node *n = nullptr;
1953 int j;
1954
1955 // Find the branch; ignore trailing NOPs.
1956 for (j = block->number_of_nodes() - 1; j >= 0; j--) {
1957 n = block->get_node(j);
1958 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) {
1959 break;
1960 }
1961 }
1962
1963 // If we didn't find anything, continue
1964 if (j < 0) {
1965 continue;
1966 }
1967
1968 // Compute ExceptionHandlerTable subtable entry and add it
1969 // (skip empty blocks)
1970 if (n->is_Catch()) {
1971
1972 // Get the offset of the return from the call
1973 uint call_return = call_returns[block->_pre_order];
1974 #ifdef ASSERT
1975 assert( call_return > 0, "no call seen for this basic block" );
1976 while (block->get_node(--j)->is_MachProj()) ;
1977 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call");
1978 #endif
1979 // last instruction is a CatchNode, find it's CatchProjNodes
1980 int nof_succs = block->_num_succs;
1981 // allocate space
1982 GrowableArray<intptr_t> handler_bcis(nof_succs);
1983 GrowableArray<intptr_t> handler_pcos(nof_succs);
1984 // iterate through all successors
1985 for (int j = 0; j < nof_succs; j++) {
1986 Block* s = block->_succs[j];
1987 bool found_p = false;
1988 for (uint k = 1; k < s->num_preds(); k++) {
1989 Node* pk = s->pred(k);
1990 if (pk->is_CatchProj() && pk->in(0) == n) {
1991 const CatchProjNode* p = pk->as_CatchProj();
1992 found_p = true;
1993 // add the corresponding handler bci & pco information
1994 if (p->_con != CatchProjNode::fall_through_index) {
1995 // p leads to an exception handler (and is not fall through)
1996 assert(s == C->cfg()->get_block(s->_pre_order), "bad numbering");
1997 // no duplicates, please
1998 if (!handler_bcis.contains(p->handler_bci())) {
1999 uint block_num = s->non_connector()->_pre_order;
2000 handler_bcis.append(p->handler_bci());
2001 handler_pcos.append(blk_labels[block_num].loc_pos());
2002 }
2003 }
2004 }
2005 }
2006 assert(found_p, "no matching predecessor found");
2007 // Note: Due to empty block removal, one block may have
2008 // several CatchProj inputs, from the same Catch.
2009 }
2010
2011 // Set the offset of the return from the call
2012 assert(handler_bcis.find(-1) != -1, "must have default handler");
2013 _handler_table.add_subtable(call_return, &handler_bcis, nullptr, &handler_pcos);
2014 continue;
2015 }
2016
2017 // Handle implicit null exception table updates
2018 if (n->is_MachNullCheck()) {
2019 assert(n->in(1)->as_Mach()->barrier_data() == 0,
2020 "Implicit null checks on memory accesses with barriers are not yet supported");
2021 uint block_num = block->non_connector_successor(0)->_pre_order;
2022 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2023 continue;
2024 }
2025 // Handle implicit exception table updates: trap instructions.
2026 if (n->is_Mach() && n->as_Mach()->is_TrapBasedCheckNode()) {
2027 uint block_num = block->non_connector_successor(0)->_pre_order;
2028 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2029 continue;
2030 }
2031 } // End of for all blocks fill in exception table entries
2032 }
2033
2034 // Static Variables
2035 #ifndef PRODUCT
2036 uint Scheduling::_total_nop_size = 0;
2037 uint Scheduling::_total_method_size = 0;
2038 uint Scheduling::_total_branches = 0;
2039 uint Scheduling::_total_unconditional_delays = 0;
2040 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
2041 #endif
2042
2043 // Initializer for class Scheduling
2044
2045 Scheduling::Scheduling(Arena *arena, Compile &compile)
2046 : _arena(arena),
2047 _cfg(compile.cfg()),
2048 _regalloc(compile.regalloc()),
2049 _scheduled(arena),
2050 _available(arena),
2051 _reg_node(arena),
2052 _pinch_free_list(arena),
2053 _next_node(nullptr),
2054 _bundle_instr_count(0),
2055 _bundle_cycle_number(0),
2056 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0])
2057 #ifndef PRODUCT
2058 , _branches(0)
2059 , _unconditional_delays(0)
2060 #endif
2061 {
2062 // Create a MachNopNode
2063 _nop = new MachNopNode();
2064
2065 // Now that the nops are in the array, save the count
2066 // (but allow entries for the nops)
2067 _node_bundling_limit = compile.unique();
2068 uint node_max = _regalloc->node_regs_max_index();
2069
2070 compile.output()->set_node_bundling_limit(_node_bundling_limit);
2071
2072 // This one is persistent within the Compile class
2073 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max);
2074
2075 // Allocate space for fixed-size arrays
2076 _uses = NEW_ARENA_ARRAY(arena, short, node_max);
2077 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
2078
2079 // Clear the arrays
2080 for (uint i = 0; i < node_max; i++) {
2081 ::new (&_node_bundling_base[i]) Bundle();
2082 }
2083 memset(_uses, 0, node_max * sizeof(short));
2084 memset(_current_latency, 0, node_max * sizeof(unsigned short));
2085
2086 // Clear the bundling information
2087 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements));
2088
2089 // Get the last node
2090 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1);
2091
2092 _next_node = block->get_node(block->number_of_nodes() - 1);
2093 }
2094
2095 #ifndef PRODUCT
2096 // Scheduling destructor
2097 Scheduling::~Scheduling() {
2098 _total_branches += _branches;
2099 _total_unconditional_delays += _unconditional_delays;
2100 }
2101 #endif
2102
2103 // Step ahead "i" cycles
2104 void Scheduling::step(uint i) {
2105
2106 Bundle *bundle = node_bundling(_next_node);
2107 bundle->set_starts_bundle();
2108
2109 // Update the bundle record, but leave the flags information alone
2110 if (_bundle_instr_count > 0) {
2111 bundle->set_instr_count(_bundle_instr_count);
2112 bundle->set_resources_used(_bundle_use.resourcesUsed());
2113 }
2114
2115 // Update the state information
2116 _bundle_instr_count = 0;
2117 _bundle_cycle_number += i;
2118 _bundle_use.step(i);
2119 }
2120
2121 void Scheduling::step_and_clear() {
2122 Bundle *bundle = node_bundling(_next_node);
2123 bundle->set_starts_bundle();
2124
2125 // Update the bundle record
2126 if (_bundle_instr_count > 0) {
2127 bundle->set_instr_count(_bundle_instr_count);
2128 bundle->set_resources_used(_bundle_use.resourcesUsed());
2129
2130 _bundle_cycle_number += 1;
2131 }
2132
2133 // Clear the bundling information
2134 _bundle_instr_count = 0;
2135 _bundle_use.reset();
2136
2137 memcpy(_bundle_use_elements,
2138 Pipeline_Use::elaborated_elements,
2139 sizeof(Pipeline_Use::elaborated_elements));
2140 }
2141
2142 // Perform instruction scheduling and bundling over the sequence of
2143 // instructions in backwards order.
2144 void PhaseOutput::ScheduleAndBundle() {
2145
2146 // Don't optimize this if it isn't a method
2147 if (!C->method())
2148 return;
2149
2150 // Don't optimize this if scheduling is disabled
2151 if (!C->do_scheduling())
2152 return;
2153
2154 // Scheduling code works only with pairs (8 bytes) maximum.
2155 // And when the scalable vector register is used, we may spill/unspill
2156 // the whole reg regardless of the max vector size.
2157 if (C->max_vector_size() > 8 ||
2158 (C->max_vector_size() > 0 && Matcher::supports_scalable_vector())) {
2159 return;
2160 }
2161
2162 Compile::TracePhase tp(_t_instrSched);
2163
2164 // Create a data structure for all the scheduling information
2165 Scheduling scheduling(Thread::current()->resource_area(), *C);
2166
2167 // Walk backwards over each basic block, computing the needed alignment
2168 // Walk over all the basic blocks
2169 scheduling.DoScheduling();
2170
2171 #ifndef PRODUCT
2172 if (C->trace_opto_output()) {
2173 // Buffer and print all at once
2174 ResourceMark rm;
2175 stringStream ss;
2176 ss.print("\n---- After ScheduleAndBundle ----\n");
2177 print_scheduling(&ss);
2178 tty->print("%s", ss.as_string());
2179 }
2180 #endif
2181 }
2182
2183 #ifndef PRODUCT
2184 // Separated out so that it can be called directly from debugger
2185 void PhaseOutput::print_scheduling() {
2186 print_scheduling(tty);
2187 }
2188
2189 void PhaseOutput::print_scheduling(outputStream* output_stream) {
2190 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
2191 output_stream->print("\nBB#%03d:\n", i);
2192 Block* block = C->cfg()->get_block(i);
2193 for (uint j = 0; j < block->number_of_nodes(); j++) {
2194 Node* n = block->get_node(j);
2195 OptoReg::Name reg = C->regalloc()->get_reg_first(n);
2196 output_stream->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : "");
2197 n->dump("\n", false, output_stream);
2198 }
2199 }
2200 }
2201 #endif
2202
2203 // See if this node fits into the present instruction bundle
2204 bool Scheduling::NodeFitsInBundle(Node *n) {
2205 uint n_idx = n->_idx;
2206
2207 // If this is the unconditional delay instruction, then it fits
2208 if (n == _unconditional_delay_slot) {
2209 #ifndef PRODUCT
2210 if (_cfg->C->trace_opto_output())
2211 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx);
2212 #endif
2213 return (true);
2214 }
2215
2216 // If the node cannot be scheduled this cycle, skip it
2217 if (_current_latency[n_idx] > _bundle_cycle_number) {
2218 #ifndef PRODUCT
2219 if (_cfg->C->trace_opto_output())
2220 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n",
2221 n->_idx, _current_latency[n_idx], _bundle_cycle_number);
2222 #endif
2223 return (false);
2224 }
2225
2226 const Pipeline *node_pipeline = n->pipeline();
2227
2228 uint instruction_count = node_pipeline->instructionCount();
2229 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2230 instruction_count = 0;
2231 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2232 instruction_count++;
2233
2234 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) {
2235 #ifndef PRODUCT
2236 if (_cfg->C->trace_opto_output())
2237 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n",
2238 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle);
2239 #endif
2240 return (false);
2241 }
2242
2243 // Don't allow non-machine nodes to be handled this way
2244 if (!n->is_Mach() && instruction_count == 0)
2245 return (false);
2246
2247 // See if there is any overlap
2248 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse());
2249
2250 if (delay > 0) {
2251 #ifndef PRODUCT
2252 if (_cfg->C->trace_opto_output())
2253 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx);
2254 #endif
2255 return false;
2256 }
2257
2258 #ifndef PRODUCT
2259 if (_cfg->C->trace_opto_output())
2260 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx);
2261 #endif
2262
2263 return true;
2264 }
2265
2266 Node * Scheduling::ChooseNodeToBundle() {
2267 uint siz = _available.size();
2268
2269 if (siz == 0) {
2270
2271 #ifndef PRODUCT
2272 if (_cfg->C->trace_opto_output())
2273 tty->print("# ChooseNodeToBundle: null\n");
2274 #endif
2275 return (nullptr);
2276 }
2277
2278 // Fast path, if only 1 instruction in the bundle
2279 if (siz == 1) {
2280 #ifndef PRODUCT
2281 if (_cfg->C->trace_opto_output()) {
2282 tty->print("# ChooseNodeToBundle (only 1): ");
2283 _available[0]->dump();
2284 }
2285 #endif
2286 return (_available[0]);
2287 }
2288
2289 // Don't bother, if the bundle is already full
2290 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) {
2291 for ( uint i = 0; i < siz; i++ ) {
2292 Node *n = _available[i];
2293
2294 // Skip projections, we'll handle them another way
2295 if (n->is_Proj())
2296 continue;
2297
2298 // This presupposed that instructions are inserted into the
2299 // available list in a legality order; i.e. instructions that
2300 // must be inserted first are at the head of the list
2301 if (NodeFitsInBundle(n)) {
2302 #ifndef PRODUCT
2303 if (_cfg->C->trace_opto_output()) {
2304 tty->print("# ChooseNodeToBundle: ");
2305 n->dump();
2306 }
2307 #endif
2308 return (n);
2309 }
2310 }
2311 }
2312
2313 // Nothing fits in this bundle, choose the highest priority
2314 #ifndef PRODUCT
2315 if (_cfg->C->trace_opto_output()) {
2316 tty->print("# ChooseNodeToBundle: ");
2317 _available[0]->dump();
2318 }
2319 #endif
2320
2321 return _available[0];
2322 }
2323
2324 int Scheduling::compare_two_spill_nodes(Node* first, Node* second) {
2325 assert(first->is_MachSpillCopy() && second->is_MachSpillCopy(), "");
2326
2327 OptoReg::Name first_src_lo = _regalloc->get_reg_first(first->in(1));
2328 OptoReg::Name first_dst_lo = _regalloc->get_reg_first(first);
2329 OptoReg::Name second_src_lo = _regalloc->get_reg_first(second->in(1));
2330 OptoReg::Name second_dst_lo = _regalloc->get_reg_first(second);
2331
2332 // Comparison between stack -> reg and stack -> reg
2333 if (OptoReg::is_stack(first_src_lo) && OptoReg::is_stack(second_src_lo) &&
2334 OptoReg::is_reg(first_dst_lo) && OptoReg::is_reg(second_dst_lo)) {
2335 return _regalloc->reg2offset(first_src_lo) - _regalloc->reg2offset(second_src_lo);
2336 }
2337
2338 // Comparison between reg -> stack and reg -> stack
2339 if (OptoReg::is_stack(first_dst_lo) && OptoReg::is_stack(second_dst_lo) &&
2340 OptoReg::is_reg(first_src_lo) && OptoReg::is_reg(second_src_lo)) {
2341 return _regalloc->reg2offset(first_dst_lo) - _regalloc->reg2offset(second_dst_lo);
2342 }
2343
2344 return 0; // Not comparable
2345 }
2346
2347 void Scheduling::AddNodeToAvailableList(Node *n) {
2348 assert( !n->is_Proj(), "projections never directly made available" );
2349 #ifndef PRODUCT
2350 if (_cfg->C->trace_opto_output()) {
2351 tty->print("# AddNodeToAvailableList: ");
2352 n->dump();
2353 }
2354 #endif
2355
2356 int latency = _current_latency[n->_idx];
2357
2358 // Insert in latency order (insertion sort). If two MachSpillCopyNodes
2359 // for stack spilling or unspilling have the same latency, we sort
2360 // them in the order of stack offset. Some ports (e.g. aarch64) may also
2361 // have more opportunities to do ld/st merging
2362 uint i;
2363 for (i = 0; i < _available.size(); i++) {
2364 if (_current_latency[_available[i]->_idx] > latency) {
2365 break;
2366 } else if (_current_latency[_available[i]->_idx] == latency &&
2367 n->is_MachSpillCopy() && _available[i]->is_MachSpillCopy() &&
2368 compare_two_spill_nodes(n, _available[i]) > 0) {
2369 break;
2370 }
2371 }
2372
2373 // Special Check for compares following branches
2374 if( n->is_Mach() && _scheduled.size() > 0 ) {
2375 int op = n->as_Mach()->ideal_Opcode();
2376 Node *last = _scheduled[0];
2377 if( last->is_MachIf() && last->in(1) == n &&
2378 ( op == Op_CmpI ||
2379 op == Op_CmpU ||
2380 op == Op_CmpUL ||
2381 op == Op_CmpP ||
2382 op == Op_CmpF ||
2383 op == Op_CmpD ||
2384 op == Op_CmpL ) ) {
2385
2386 // Recalculate position, moving to front of same latency
2387 for ( i=0 ; i < _available.size(); i++ )
2388 if (_current_latency[_available[i]->_idx] >= latency)
2389 break;
2390 }
2391 }
2392
2393 // Insert the node in the available list
2394 _available.insert(i, n);
2395
2396 #ifndef PRODUCT
2397 if (_cfg->C->trace_opto_output())
2398 dump_available();
2399 #endif
2400 }
2401
2402 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) {
2403 for ( uint i=0; i < n->len(); i++ ) {
2404 Node *def = n->in(i);
2405 if (!def) continue;
2406 if( def->is_Proj() ) // If this is a machine projection, then
2407 def = def->in(0); // propagate usage thru to the base instruction
2408
2409 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local
2410 continue;
2411 }
2412
2413 // Compute the latency
2414 uint l = _bundle_cycle_number + n->latency(i);
2415 if (_current_latency[def->_idx] < l)
2416 _current_latency[def->_idx] = l;
2417
2418 // If this does not have uses then schedule it
2419 if ((--_uses[def->_idx]) == 0)
2420 AddNodeToAvailableList(def);
2421 }
2422 }
2423
2424 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) {
2425 #ifndef PRODUCT
2426 if (_cfg->C->trace_opto_output()) {
2427 tty->print("# AddNodeToBundle: ");
2428 n->dump();
2429 }
2430 #endif
2431
2432 // Remove this from the available list
2433 uint i;
2434 for (i = 0; i < _available.size(); i++)
2435 if (_available[i] == n)
2436 break;
2437 assert(i < _available.size(), "entry in _available list not found");
2438 _available.remove(i);
2439
2440 // See if this fits in the current bundle
2441 const Pipeline *node_pipeline = n->pipeline();
2442 const Pipeline_Use& node_usage = node_pipeline->resourceUse();
2443
2444 // Check for instructions to be placed in the delay slot. We
2445 // do this before we actually schedule the current instruction,
2446 // because the delay slot follows the current instruction.
2447 if (Pipeline::_branch_has_delay_slot &&
2448 node_pipeline->hasBranchDelay() &&
2449 !_unconditional_delay_slot) {
2450
2451 uint siz = _available.size();
2452
2453 // Conditional branches can support an instruction that
2454 // is unconditionally executed and not dependent by the
2455 // branch, OR a conditionally executed instruction if
2456 // the branch is taken. In practice, this means that
2457 // the first instruction at the branch target is
2458 // copied to the delay slot, and the branch goes to
2459 // the instruction after that at the branch target
2460 if ( n->is_MachBranch() ) {
2461
2462 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" );
2463 assert( !n->is_Catch(), "should not look for delay slot for Catch" );
2464
2465 #ifndef PRODUCT
2466 _branches++;
2467 #endif
2468
2469 // At least 1 instruction is on the available list
2470 // that is not dependent on the branch
2471 for (uint i = 0; i < siz; i++) {
2472 Node *d = _available[i];
2473 const Pipeline *avail_pipeline = d->pipeline();
2474
2475 // Don't allow safepoints in the branch shadow, that will
2476 // cause a number of difficulties
2477 if ( avail_pipeline->instructionCount() == 1 &&
2478 !avail_pipeline->hasMultipleBundles() &&
2479 !avail_pipeline->hasBranchDelay() &&
2480 Pipeline::instr_has_unit_size() &&
2481 d->size(_regalloc) == Pipeline::instr_unit_size() &&
2482 NodeFitsInBundle(d) &&
2483 !node_bundling(d)->used_in_delay()) {
2484
2485 if (d->is_Mach() && !d->is_MachSafePoint()) {
2486 // A node that fits in the delay slot was found, so we need to
2487 // set the appropriate bits in the bundle pipeline information so
2488 // that it correctly indicates resource usage. Later, when we
2489 // attempt to add this instruction to the bundle, we will skip
2490 // setting the resource usage.
2491 _unconditional_delay_slot = d;
2492 node_bundling(n)->set_use_unconditional_delay();
2493 node_bundling(d)->set_used_in_unconditional_delay();
2494 _bundle_use.add_usage(avail_pipeline->resourceUse());
2495 _current_latency[d->_idx] = _bundle_cycle_number;
2496 _next_node = d;
2497 ++_bundle_instr_count;
2498 #ifndef PRODUCT
2499 _unconditional_delays++;
2500 #endif
2501 break;
2502 }
2503 }
2504 }
2505 }
2506
2507 // No delay slot, add a nop to the usage
2508 if (!_unconditional_delay_slot) {
2509 // See if adding an instruction in the delay slot will overflow
2510 // the bundle.
2511 if (!NodeFitsInBundle(_nop)) {
2512 #ifndef PRODUCT
2513 if (_cfg->C->trace_opto_output())
2514 tty->print("# *** STEP(1 instruction for delay slot) ***\n");
2515 #endif
2516 step(1);
2517 }
2518
2519 _bundle_use.add_usage(_nop->pipeline()->resourceUse());
2520 _next_node = _nop;
2521 ++_bundle_instr_count;
2522 }
2523
2524 // See if the instruction in the delay slot requires a
2525 // step of the bundles
2526 if (!NodeFitsInBundle(n)) {
2527 #ifndef PRODUCT
2528 if (_cfg->C->trace_opto_output())
2529 tty->print("# *** STEP(branch won't fit) ***\n");
2530 #endif
2531 // Update the state information
2532 _bundle_instr_count = 0;
2533 _bundle_cycle_number += 1;
2534 _bundle_use.step(1);
2535 }
2536 }
2537
2538 // Get the number of instructions
2539 uint instruction_count = node_pipeline->instructionCount();
2540 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2541 instruction_count = 0;
2542
2543 // Compute the latency information
2544 uint delay = 0;
2545
2546 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) {
2547 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number;
2548 if (relative_latency < 0)
2549 relative_latency = 0;
2550
2551 delay = _bundle_use.full_latency(relative_latency, node_usage);
2552
2553 // Does not fit in this bundle, start a new one
2554 if (delay > 0) {
2555 step(delay);
2556
2557 #ifndef PRODUCT
2558 if (_cfg->C->trace_opto_output())
2559 tty->print("# *** STEP(%d) ***\n", delay);
2560 #endif
2561 }
2562 }
2563
2564 // If this was placed in the delay slot, ignore it
2565 if (n != _unconditional_delay_slot) {
2566
2567 if (delay == 0) {
2568 if (node_pipeline->hasMultipleBundles()) {
2569 #ifndef PRODUCT
2570 if (_cfg->C->trace_opto_output())
2571 tty->print("# *** STEP(multiple instructions) ***\n");
2572 #endif
2573 step(1);
2574 }
2575
2576 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) {
2577 #ifndef PRODUCT
2578 if (_cfg->C->trace_opto_output())
2579 tty->print("# *** STEP(%d >= %d instructions) ***\n",
2580 instruction_count + _bundle_instr_count,
2581 Pipeline::_max_instrs_per_cycle);
2582 #endif
2583 step(1);
2584 }
2585 }
2586
2587 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2588 _bundle_instr_count++;
2589
2590 // Set the node's latency
2591 _current_latency[n->_idx] = _bundle_cycle_number;
2592
2593 // Now merge the functional unit information
2594 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode())
2595 _bundle_use.add_usage(node_usage);
2596
2597 // Increment the number of instructions in this bundle
2598 _bundle_instr_count += instruction_count;
2599
2600 // Remember this node for later
2601 if (n->is_Mach())
2602 _next_node = n;
2603 }
2604
2605 // It's possible to have a BoxLock in the graph and in the _bbs mapping but
2606 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks.
2607 // 'Schedule' them (basically ignore in the schedule) but do not insert them
2608 // into the block. All other scheduled nodes get put in the schedule here.
2609 int op = n->Opcode();
2610 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR
2611 (op != Op_Node && // Not an unused antidepedence node and
2612 // not an unallocated boxlock
2613 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) {
2614
2615 // Push any trailing projections
2616 if( bb->get_node(bb->number_of_nodes()-1) != n ) {
2617 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
2618 Node *foi = n->fast_out(i);
2619 if( foi->is_Proj() )
2620 _scheduled.push(foi);
2621 }
2622 }
2623
2624 // Put the instruction in the schedule list
2625 _scheduled.push(n);
2626 }
2627
2628 #ifndef PRODUCT
2629 if (_cfg->C->trace_opto_output())
2630 dump_available();
2631 #endif
2632
2633 // Walk all the definitions, decrementing use counts, and
2634 // if a definition has a 0 use count, place it in the available list.
2635 DecrementUseCounts(n,bb);
2636 }
2637
2638 // This method sets the use count within a basic block. We will ignore all
2639 // uses outside the current basic block. As we are doing a backwards walk,
2640 // any node we reach that has a use count of 0 may be scheduled. This also
2641 // avoids the problem of cyclic references from phi nodes, as long as phi
2642 // nodes are at the front of the basic block. This method also initializes
2643 // the available list to the set of instructions that have no uses within this
2644 // basic block.
2645 void Scheduling::ComputeUseCount(const Block *bb) {
2646 #ifndef PRODUCT
2647 if (_cfg->C->trace_opto_output())
2648 tty->print("# -> ComputeUseCount\n");
2649 #endif
2650
2651 // Clear the list of available and scheduled instructions, just in case
2652 _available.clear();
2653 _scheduled.clear();
2654
2655 // No delay slot specified
2656 _unconditional_delay_slot = nullptr;
2657
2658 #ifdef ASSERT
2659 for( uint i=0; i < bb->number_of_nodes(); i++ )
2660 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" );
2661 #endif
2662
2663 // Force the _uses count to never go to zero for unscheduable pieces
2664 // of the block
2665 for( uint k = 0; k < _bb_start; k++ )
2666 _uses[bb->get_node(k)->_idx] = 1;
2667 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ )
2668 _uses[bb->get_node(l)->_idx] = 1;
2669
2670 // Iterate backwards over the instructions in the block. Don't count the
2671 // branch projections at end or the block header instructions.
2672 for( uint j = _bb_end-1; j >= _bb_start; j-- ) {
2673 Node *n = bb->get_node(j);
2674 if( n->is_Proj() ) continue; // Projections handled another way
2675
2676 // Account for all uses
2677 for ( uint k = 0; k < n->len(); k++ ) {
2678 Node *inp = n->in(k);
2679 if (!inp) continue;
2680 assert(inp != n, "no cycles allowed" );
2681 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use?
2682 if (inp->is_Proj()) { // Skip through Proj's
2683 inp = inp->in(0);
2684 }
2685 ++_uses[inp->_idx]; // Count 1 block-local use
2686 }
2687 }
2688
2689 // If this instruction has a 0 use count, then it is available
2690 if (!_uses[n->_idx]) {
2691 _current_latency[n->_idx] = _bundle_cycle_number;
2692 AddNodeToAvailableList(n);
2693 }
2694
2695 #ifndef PRODUCT
2696 if (_cfg->C->trace_opto_output()) {
2697 tty->print("# uses: %3d: ", _uses[n->_idx]);
2698 n->dump();
2699 }
2700 #endif
2701 }
2702
2703 #ifndef PRODUCT
2704 if (_cfg->C->trace_opto_output())
2705 tty->print("# <- ComputeUseCount\n");
2706 #endif
2707 }
2708
2709 // This routine performs scheduling on each basic block in reverse order,
2710 // using instruction latencies and taking into account function unit
2711 // availability.
2712 void Scheduling::DoScheduling() {
2713 #ifndef PRODUCT
2714 if (_cfg->C->trace_opto_output())
2715 tty->print("# -> DoScheduling\n");
2716 #endif
2717
2718 Block *succ_bb = nullptr;
2719 Block *bb;
2720 Compile* C = Compile::current();
2721
2722 // Walk over all the basic blocks in reverse order
2723 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) {
2724 bb = _cfg->get_block(i);
2725
2726 #ifndef PRODUCT
2727 if (_cfg->C->trace_opto_output()) {
2728 tty->print("# Schedule BB#%03d (initial)\n", i);
2729 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2730 bb->get_node(j)->dump();
2731 }
2732 }
2733 #endif
2734
2735 // On the head node, skip processing
2736 if (bb == _cfg->get_root_block()) {
2737 continue;
2738 }
2739
2740 // Skip empty, connector blocks
2741 if (bb->is_connector())
2742 continue;
2743
2744 // If the following block is not the sole successor of
2745 // this one, then reset the pipeline information
2746 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) {
2747 #ifndef PRODUCT
2748 if (_cfg->C->trace_opto_output()) {
2749 tty->print("*** bundle start of next BB, node %d, for %d instructions\n",
2750 _next_node->_idx, _bundle_instr_count);
2751 }
2752 #endif
2753 step_and_clear();
2754 }
2755
2756 // Leave untouched the starting instruction, any Phis, a CreateEx node
2757 // or Top. bb->get_node(_bb_start) is the first schedulable instruction.
2758 _bb_end = bb->number_of_nodes()-1;
2759 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) {
2760 Node *n = bb->get_node(_bb_start);
2761 // Things not matched, like Phinodes and ProjNodes don't get scheduled.
2762 // Also, MachIdealNodes do not get scheduled
2763 if( !n->is_Mach() ) continue; // Skip non-machine nodes
2764 MachNode *mach = n->as_Mach();
2765 int iop = mach->ideal_Opcode();
2766 if( iop == Op_CreateEx ) continue; // CreateEx is pinned
2767 if( iop == Op_Con ) continue; // Do not schedule Top
2768 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes
2769 mach->pipeline() == MachNode::pipeline_class() &&
2770 !n->is_SpillCopy() && !n->is_MachMerge() ) // Breakpoints, Prolog, etc
2771 continue;
2772 break; // Funny loop structure to be sure...
2773 }
2774 // Compute last "interesting" instruction in block - last instruction we
2775 // might schedule. _bb_end points just after last schedulable inst. We
2776 // normally schedule conditional branches (despite them being forced last
2777 // in the block), because they have delay slots we can fill. Calls all
2778 // have their delay slots filled in the template expansions, so we don't
2779 // bother scheduling them.
2780 Node *last = bb->get_node(_bb_end);
2781 // Ignore trailing NOPs.
2782 while (_bb_end > 0 && last->is_Mach() &&
2783 last->as_Mach()->ideal_Opcode() == Op_Con) {
2784 last = bb->get_node(--_bb_end);
2785 }
2786 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, "");
2787 if( last->is_Catch() ||
2788 (last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) {
2789 // There might be a prior call. Skip it.
2790 while (_bb_start < _bb_end && bb->get_node(--_bb_end)->is_MachProj());
2791 } else if( last->is_MachNullCheck() ) {
2792 // Backup so the last null-checked memory instruction is
2793 // outside the schedulable range. Skip over the nullcheck,
2794 // projection, and the memory nodes.
2795 Node *mem = last->in(1);
2796 do {
2797 _bb_end--;
2798 } while (mem != bb->get_node(_bb_end));
2799 } else {
2800 // Set _bb_end to point after last schedulable inst.
2801 _bb_end++;
2802 }
2803
2804 assert( _bb_start <= _bb_end, "inverted block ends" );
2805
2806 // Compute the register antidependencies for the basic block
2807 ComputeRegisterAntidependencies(bb);
2808 if (C->failing()) return; // too many D-U pinch points
2809
2810 // Compute the usage within the block, and set the list of all nodes
2811 // in the block that have no uses within the block.
2812 ComputeUseCount(bb);
2813
2814 // Schedule the remaining instructions in the block
2815 while ( _available.size() > 0 ) {
2816 Node *n = ChooseNodeToBundle();
2817 guarantee(n != nullptr, "no nodes available");
2818 AddNodeToBundle(n,bb);
2819 }
2820
2821 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" );
2822 #ifdef ASSERT
2823 for( uint l = _bb_start; l < _bb_end; l++ ) {
2824 Node *n = bb->get_node(l);
2825 uint m;
2826 for( m = 0; m < _bb_end-_bb_start; m++ )
2827 if( _scheduled[m] == n )
2828 break;
2829 assert( m < _bb_end-_bb_start, "instruction missing in schedule" );
2830 }
2831 #endif
2832
2833 // Now copy the instructions (in reverse order) back to the block
2834 for ( uint k = _bb_start; k < _bb_end; k++ )
2835 bb->map_node(_scheduled[_bb_end-k-1], k);
2836
2837 #ifndef PRODUCT
2838 if (_cfg->C->trace_opto_output()) {
2839 tty->print("# Schedule BB#%03d (final)\n", i);
2840 uint current = 0;
2841 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2842 Node *n = bb->get_node(j);
2843 if( valid_bundle_info(n) ) {
2844 Bundle *bundle = node_bundling(n);
2845 if (bundle->instr_count() > 0 || bundle->flags() > 0) {
2846 tty->print("*** Bundle: ");
2847 bundle->dump();
2848 }
2849 n->dump();
2850 }
2851 }
2852 }
2853 #endif
2854 #ifdef ASSERT
2855 verify_good_schedule(bb,"after block local scheduling");
2856 #endif
2857 }
2858
2859 #ifndef PRODUCT
2860 if (_cfg->C->trace_opto_output())
2861 tty->print("# <- DoScheduling\n");
2862 #endif
2863
2864 // Record final node-bundling array location
2865 _regalloc->C->output()->set_node_bundling_base(_node_bundling_base);
2866
2867 } // end DoScheduling
2868
2869 // Verify that no live-range used in the block is killed in the block by a
2870 // wrong DEF. This doesn't verify live-ranges that span blocks.
2871
2872 // Check for edge existence. Used to avoid adding redundant precedence edges.
2873 static bool edge_from_to( Node *from, Node *to ) {
2874 for( uint i=0; i<from->len(); i++ )
2875 if( from->in(i) == to )
2876 return true;
2877 return false;
2878 }
2879
2880 #ifdef ASSERT
2881 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) {
2882 // Check for bad kills
2883 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow
2884 Node *prior_use = _reg_node[def];
2885 if( prior_use && !edge_from_to(prior_use,n) ) {
2886 tty->print("%s = ",OptoReg::as_VMReg(def)->name());
2887 n->dump();
2888 tty->print_cr("...");
2889 prior_use->dump();
2890 assert(edge_from_to(prior_use,n), "%s", msg);
2891 }
2892 _reg_node.map(def,nullptr); // Kill live USEs
2893 }
2894 }
2895
2896 void Scheduling::verify_good_schedule( Block *b, const char *msg ) {
2897
2898 // Zap to something reasonable for the verify code
2899 _reg_node.clear();
2900
2901 // Walk over the block backwards. Check to make sure each DEF doesn't
2902 // kill a live value (other than the one it's supposed to). Add each
2903 // USE to the live set.
2904 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) {
2905 Node *n = b->get_node(i);
2906 int n_op = n->Opcode();
2907 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) {
2908 // Fat-proj kills a slew of registers
2909 RegMaskIterator rmi(n->out_RegMask());
2910 while (rmi.has_next()) {
2911 OptoReg::Name kill = rmi.next();
2912 verify_do_def(n, kill, msg);
2913 }
2914 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes
2915 // Get DEF'd registers the normal way
2916 verify_do_def( n, _regalloc->get_reg_first(n), msg );
2917 verify_do_def( n, _regalloc->get_reg_second(n), msg );
2918 }
2919
2920 // Now make all USEs live
2921 for( uint i=1; i<n->req(); i++ ) {
2922 Node *def = n->in(i);
2923 assert(def != nullptr, "input edge required");
2924 OptoReg::Name reg_lo = _regalloc->get_reg_first(def);
2925 OptoReg::Name reg_hi = _regalloc->get_reg_second(def);
2926 if( OptoReg::is_valid(reg_lo) ) {
2927 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), "%s", msg);
2928 _reg_node.map(reg_lo,n);
2929 }
2930 if( OptoReg::is_valid(reg_hi) ) {
2931 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), "%s", msg);
2932 _reg_node.map(reg_hi,n);
2933 }
2934 }
2935
2936 }
2937
2938 // Zap to something reasonable for the Antidependence code
2939 _reg_node.clear();
2940 }
2941 #endif
2942
2943 // Conditionally add precedence edges. Avoid putting edges on Projs.
2944 static void add_prec_edge_from_to( Node *from, Node *to ) {
2945 if( from->is_Proj() ) { // Put precedence edge on Proj's input
2946 assert( from->req() == 1 && (from->len() == 1 || from->in(1) == nullptr), "no precedence edges on projections" );
2947 from = from->in(0);
2948 }
2949 if( from != to && // No cycles (for things like LD L0,[L0+4] )
2950 !edge_from_to( from, to ) ) // Avoid duplicate edge
2951 from->add_prec(to);
2952 }
2953
2954 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) {
2955 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow
2956 return;
2957
2958 if (OptoReg::is_reg(def_reg)) {
2959 VMReg vmreg = OptoReg::as_VMReg(def_reg);
2960 if (vmreg->is_reg() && !vmreg->is_concrete() && !vmreg->prev()->is_concrete()) {
2961 // This is one of the high slots of a vector register.
2962 // ScheduleAndBundle already checked there are no live wide
2963 // vectors in this method so it can be safely ignored.
2964 return;
2965 }
2966 }
2967
2968 Node *pinch = _reg_node[def_reg]; // Get pinch point
2969 if ((pinch == nullptr) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet?
2970 is_def ) { // Check for a true def (not a kill)
2971 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point
2972 return;
2973 }
2974
2975 Node *kill = def; // Rename 'def' to more descriptive 'kill'
2976 DEBUG_ONLY( def = (Node*)((intptr_t)0xdeadbeef); )
2977
2978 // After some number of kills there _may_ be a later def
2979 Node *later_def = nullptr;
2980
2981 Compile* C = Compile::current();
2982
2983 // Finding a kill requires a real pinch-point.
2984 // Check for not already having a pinch-point.
2985 // Pinch points are Op_Node's.
2986 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point?
2987 later_def = pinch; // Must be def/kill as optimistic pinch-point
2988 if ( _pinch_free_list.size() > 0) {
2989 pinch = _pinch_free_list.pop();
2990 } else {
2991 pinch = new Node(1); // Pinch point to-be
2992 }
2993 if (pinch->_idx >= _regalloc->node_regs_max_index()) {
2994 DEBUG_ONLY( pinch->dump(); );
2995 assert(false, "too many D-U pinch points: %d >= %d", pinch->_idx, _regalloc->node_regs_max_index());
2996 _cfg->C->record_method_not_compilable("too many D-U pinch points");
2997 return;
2998 }
2999 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init)
3000 _reg_node.map(def_reg,pinch); // Record pinch-point
3001 //regalloc()->set_bad(pinch->_idx); // Already initialized this way.
3002 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill
3003 pinch->init_req(0, C->top()); // set not null for the next call
3004 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch
3005 later_def = nullptr; // and no later def
3006 }
3007 pinch->set_req(0,later_def); // Hook later def so we can find it
3008 } else { // Else have valid pinch point
3009 if( pinch->in(0) ) // If there is a later-def
3010 later_def = pinch->in(0); // Get it
3011 }
3012
3013 // Add output-dependence edge from later def to kill
3014 if( later_def ) // If there is some original def
3015 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill
3016
3017 // See if current kill is also a use, and so is forced to be the pinch-point.
3018 if( pinch->Opcode() == Op_Node ) {
3019 Node *uses = kill->is_Proj() ? kill->in(0) : kill;
3020 for( uint i=1; i<uses->req(); i++ ) {
3021 if( _regalloc->get_reg_first(uses->in(i)) == def_reg ||
3022 _regalloc->get_reg_second(uses->in(i)) == def_reg ) {
3023 // Yes, found a use/kill pinch-point
3024 pinch->set_req(0,nullptr); //
3025 pinch->replace_by(kill); // Move anti-dep edges up
3026 pinch = kill;
3027 _reg_node.map(def_reg,pinch);
3028 return;
3029 }
3030 }
3031 }
3032
3033 // Add edge from kill to pinch-point
3034 add_prec_edge_from_to(kill,pinch);
3035 }
3036
3037 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) {
3038 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow
3039 return;
3040 Node *pinch = _reg_node[use_reg]; // Get pinch point
3041 // Check for no later def_reg/kill in block
3042 if ((pinch != nullptr) && _cfg->get_block_for_node(pinch) == b &&
3043 // Use has to be block-local as well
3044 _cfg->get_block_for_node(use) == b) {
3045 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?)
3046 pinch->req() == 1 ) { // pinch not yet in block?
3047 pinch->del_req(0); // yank pointer to later-def, also set flag
3048 // Insert the pinch-point in the block just after the last use
3049 b->insert_node(pinch, b->find_node(use) + 1);
3050 _bb_end++; // Increase size scheduled region in block
3051 }
3052
3053 add_prec_edge_from_to(pinch,use);
3054 }
3055 }
3056
3057 // We insert antidependences between the reads and following write of
3058 // allocated registers to prevent illegal code motion. Hopefully, the
3059 // number of added references should be fairly small, especially as we
3060 // are only adding references within the current basic block.
3061 void Scheduling::ComputeRegisterAntidependencies(Block *b) {
3062
3063 #ifdef ASSERT
3064 verify_good_schedule(b,"before block local scheduling");
3065 #endif
3066
3067 // A valid schedule, for each register independently, is an endless cycle
3068 // of: a def, then some uses (connected to the def by true dependencies),
3069 // then some kills (defs with no uses), finally the cycle repeats with a new
3070 // def. The uses are allowed to float relative to each other, as are the
3071 // kills. No use is allowed to slide past a kill (or def). This requires
3072 // antidependencies between all uses of a single def and all kills that
3073 // follow, up to the next def. More edges are redundant, because later defs
3074 // & kills are already serialized with true or antidependencies. To keep
3075 // the edge count down, we add a 'pinch point' node if there's more than
3076 // one use or more than one kill/def.
3077
3078 // We add dependencies in one bottom-up pass.
3079
3080 // For each instruction we handle it's DEFs/KILLs, then it's USEs.
3081
3082 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this
3083 // register. If not, we record the DEF/KILL in _reg_node, the
3084 // register-to-def mapping. If there is a prior DEF/KILL, we insert a
3085 // "pinch point", a new Node that's in the graph but not in the block.
3086 // We put edges from the prior and current DEF/KILLs to the pinch point.
3087 // We put the pinch point in _reg_node. If there's already a pinch point
3088 // we merely add an edge from the current DEF/KILL to the pinch point.
3089
3090 // After doing the DEF/KILLs, we handle USEs. For each used register, we
3091 // put an edge from the pinch point to the USE.
3092
3093 // To be expedient, the _reg_node array is pre-allocated for the whole
3094 // compilation. _reg_node is lazily initialized; it either contains a null,
3095 // or a valid def/kill/pinch-point, or a leftover node from some prior
3096 // block. Leftover node from some prior block is treated like a null (no
3097 // prior def, so no anti-dependence needed). Valid def is distinguished by
3098 // it being in the current block.
3099 bool fat_proj_seen = false;
3100 uint last_safept = _bb_end-1;
3101 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : nullptr;
3102 Node* last_safept_node = end_node;
3103 for( uint i = _bb_end-1; i >= _bb_start; i-- ) {
3104 Node *n = b->get_node(i);
3105 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges
3106 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) {
3107 // Fat-proj kills a slew of registers
3108 // This can add edges to 'n' and obscure whether or not it was a def,
3109 // hence the is_def flag.
3110 fat_proj_seen = true;
3111 RegMaskIterator rmi(n->out_RegMask());
3112 while (rmi.has_next()) {
3113 OptoReg::Name kill = rmi.next();
3114 anti_do_def(b, n, kill, is_def);
3115 }
3116 } else {
3117 // Get DEF'd registers the normal way
3118 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def );
3119 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def );
3120 }
3121
3122 // Kill projections on a branch should appear to occur on the
3123 // branch, not afterwards, so grab the masks from the projections
3124 // and process them.
3125 if (n->is_MachBranch() || (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump)) {
3126 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3127 Node* use = n->fast_out(i);
3128 if (use->is_Proj()) {
3129 RegMaskIterator rmi(use->out_RegMask());
3130 while (rmi.has_next()) {
3131 OptoReg::Name kill = rmi.next();
3132 anti_do_def(b, n, kill, false);
3133 }
3134 }
3135 }
3136 }
3137
3138 // Check each register used by this instruction for a following DEF/KILL
3139 // that must occur afterward and requires an anti-dependence edge.
3140 for( uint j=0; j<n->req(); j++ ) {
3141 Node *def = n->in(j);
3142 if( def ) {
3143 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" );
3144 anti_do_use( b, n, _regalloc->get_reg_first(def) );
3145 anti_do_use( b, n, _regalloc->get_reg_second(def) );
3146 }
3147 }
3148 // Do not allow defs of new derived values to float above GC
3149 // points unless the base is definitely available at the GC point.
3150
3151 Node *m = b->get_node(i);
3152
3153 // Add precedence edge from following safepoint to use of derived pointer
3154 if( last_safept_node != end_node &&
3155 m != last_safept_node) {
3156 for (uint k = 1; k < m->req(); k++) {
3157 const Type *t = m->in(k)->bottom_type();
3158 if( t->isa_oop_ptr() &&
3159 t->is_ptr()->offset() != 0 ) {
3160 last_safept_node->add_prec( m );
3161 break;
3162 }
3163 }
3164 }
3165
3166 if( n->jvms() ) { // Precedence edge from derived to safept
3167 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
3168 if( b->get_node(last_safept) != last_safept_node ) {
3169 last_safept = b->find_node(last_safept_node);
3170 }
3171 for( uint j=last_safept; j > i; j-- ) {
3172 Node *mach = b->get_node(j);
3173 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
3174 mach->add_prec( n );
3175 }
3176 last_safept = i;
3177 last_safept_node = m;
3178 }
3179 }
3180
3181 if (fat_proj_seen) {
3182 // Garbage collect pinch nodes that were not consumed.
3183 // They are usually created by a fat kill MachProj for a call.
3184 garbage_collect_pinch_nodes();
3185 }
3186 }
3187
3188 // Garbage collect pinch nodes for reuse by other blocks.
3189 //
3190 // The block scheduler's insertion of anti-dependence
3191 // edges creates many pinch nodes when the block contains
3192 // 2 or more Calls. A pinch node is used to prevent a
3193 // combinatorial explosion of edges. If a set of kills for a
3194 // register is anti-dependent on a set of uses (or defs), rather
3195 // than adding an edge in the graph between each pair of kill
3196 // and use (or def), a pinch is inserted between them:
3197 //
3198 // use1 use2 use3
3199 // \ | /
3200 // \ | /
3201 // pinch
3202 // / | \
3203 // / | \
3204 // kill1 kill2 kill3
3205 //
3206 // One pinch node is created per register killed when
3207 // the second call is encountered during a backwards pass
3208 // over the block. Most of these pinch nodes are never
3209 // wired into the graph because the register is never
3210 // used or def'ed in the block.
3211 //
3212 void Scheduling::garbage_collect_pinch_nodes() {
3213 #ifndef PRODUCT
3214 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:");
3215 #endif
3216 int trace_cnt = 0;
3217 for (uint k = 0; k < _reg_node.max(); k++) {
3218 Node* pinch = _reg_node[k];
3219 if ((pinch != nullptr) && pinch->Opcode() == Op_Node &&
3220 // no predecence input edges
3221 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == nullptr) ) {
3222 cleanup_pinch(pinch);
3223 _pinch_free_list.push(pinch);
3224 _reg_node.map(k, nullptr);
3225 #ifndef PRODUCT
3226 if (_cfg->C->trace_opto_output()) {
3227 trace_cnt++;
3228 if (trace_cnt > 40) {
3229 tty->print("\n");
3230 trace_cnt = 0;
3231 }
3232 tty->print(" %d", pinch->_idx);
3233 }
3234 #endif
3235 }
3236 }
3237 #ifndef PRODUCT
3238 if (_cfg->C->trace_opto_output()) tty->print("\n");
3239 #endif
3240 }
3241
3242 // Clean up a pinch node for reuse.
3243 void Scheduling::cleanup_pinch( Node *pinch ) {
3244 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking");
3245
3246 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) {
3247 Node* use = pinch->last_out(i);
3248 uint uses_found = 0;
3249 for (uint j = use->req(); j < use->len(); j++) {
3250 if (use->in(j) == pinch) {
3251 use->rm_prec(j);
3252 uses_found++;
3253 }
3254 }
3255 assert(uses_found > 0, "must be a precedence edge");
3256 i -= uses_found; // we deleted 1 or more copies of this edge
3257 }
3258 // May have a later_def entry
3259 pinch->set_req(0, nullptr);
3260 }
3261
3262 #ifndef PRODUCT
3263
3264 void Scheduling::dump_available() const {
3265 tty->print("#Availist ");
3266 for (uint i = 0; i < _available.size(); i++)
3267 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]);
3268 tty->cr();
3269 }
3270
3271 // Print Scheduling Statistics
3272 void Scheduling::print_statistics() {
3273 // Print the size added by nops for bundling
3274 tty->print("Nops added %d bytes to total of %d bytes",
3275 _total_nop_size, _total_method_size);
3276 if (_total_method_size > 0)
3277 tty->print(", for %.2f%%",
3278 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0);
3279 tty->print("\n");
3280
3281 // Print the number of branch shadows filled
3282 if (Pipeline::_branch_has_delay_slot) {
3283 tty->print("Of %d branches, %d had unconditional delay slots filled",
3284 _total_branches, _total_unconditional_delays);
3285 if (_total_branches > 0)
3286 tty->print(", for %.2f%%",
3287 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0);
3288 tty->print("\n");
3289 }
3290
3291 uint total_instructions = 0, total_bundles = 0;
3292
3293 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) {
3294 uint bundle_count = _total_instructions_per_bundle[i];
3295 total_instructions += bundle_count * i;
3296 total_bundles += bundle_count;
3297 }
3298
3299 if (total_bundles > 0)
3300 tty->print("Average ILP (excluding nops) is %.2f\n",
3301 ((double)total_instructions) / ((double)total_bundles));
3302 }
3303 #endif
3304
3305 //-----------------------init_scratch_buffer_blob------------------------------
3306 // Construct a temporary BufferBlob and cache it for this compile.
3307 void PhaseOutput::init_scratch_buffer_blob(int const_size) {
3308 // If there is already a scratch buffer blob allocated and the
3309 // constant section is big enough, use it. Otherwise free the
3310 // current and allocate a new one.
3311 BufferBlob* blob = scratch_buffer_blob();
3312 if ((blob != nullptr) && (const_size <= _scratch_const_size)) {
3313 // Use the current blob.
3314 } else {
3315 if (blob != nullptr) {
3316 BufferBlob::free(blob);
3317 }
3318
3319 ResourceMark rm;
3320 _scratch_const_size = const_size;
3321 int size = C2Compiler::initial_code_buffer_size(const_size);
3322 blob = BufferBlob::create("Compile::scratch_buffer", size);
3323 // Record the buffer blob for next time.
3324 set_scratch_buffer_blob(blob);
3325 // Have we run out of code space?
3326 if (scratch_buffer_blob() == nullptr) {
3327 // Let CompilerBroker disable further compilations.
3328 C->record_failure("Not enough space for scratch buffer in CodeCache");
3329 return;
3330 }
3331 }
3332
3333 // Initialize the relocation buffers
3334 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
3335 set_scratch_locs_memory(locs_buf);
3336 }
3337
3338
3339 //-----------------------scratch_emit_size-------------------------------------
3340 // Helper function that computes size by emitting code
3341 uint PhaseOutput::scratch_emit_size(const Node* n) {
3342 // Start scratch_emit_size section.
3343 set_in_scratch_emit_size(true);
3344
3345 // Emit into a trash buffer and count bytes emitted.
3346 // This is a pretty expensive way to compute a size,
3347 // but it works well enough if seldom used.
3348 // All common fixed-size instructions are given a size
3349 // method by the AD file.
3350 // Note that the scratch buffer blob and locs memory are
3351 // allocated at the beginning of the compile task, and
3352 // may be shared by several calls to scratch_emit_size.
3353 // The allocation of the scratch buffer blob is particularly
3354 // expensive, since it has to grab the code cache lock.
3355 BufferBlob* blob = this->scratch_buffer_blob();
3356 assert(blob != nullptr, "Initialize BufferBlob at start");
3357 assert(blob->size() > max_inst_size(), "sanity");
3358 relocInfo* locs_buf = scratch_locs_memory();
3359 address blob_begin = blob->content_begin();
3360 address blob_end = (address)locs_buf;
3361 assert(blob->contains(blob_end), "sanity");
3362 CodeBuffer buf(blob_begin, blob_end - blob_begin);
3363 buf.initialize_consts_size(_scratch_const_size);
3364 buf.initialize_stubs_size(MAX_stubs_size);
3365 assert(locs_buf != nullptr, "sanity");
3366 int lsize = MAX_locs_size / 3;
3367 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
3368 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
3369 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
3370 // Mark as scratch buffer.
3371 buf.consts()->set_scratch_emit();
3372 buf.insts()->set_scratch_emit();
3373 buf.stubs()->set_scratch_emit();
3374
3375 // Do the emission.
3376
3377 Label fakeL; // Fake label for branch instructions.
3378 Label* saveL = nullptr;
3379 uint save_bnum = 0;
3380 bool is_branch = n->is_MachBranch();
3381 C2_MacroAssembler masm(&buf);
3382 masm.bind(fakeL);
3383 if (is_branch) {
3384 n->as_MachBranch()->save_label(&saveL, &save_bnum);
3385 n->as_MachBranch()->label_set(&fakeL, 0);
3386 }
3387 n->emit(&masm, C->regalloc());
3388
3389 // Emitting into the scratch buffer should not fail
3390 assert(!C->failing_internal() || C->failure_is_artificial(), "Must not have pending failure. Reason is: %s", C->failure_reason());
3391
3392 if (is_branch) // Restore label.
3393 n->as_MachBranch()->label_set(saveL, save_bnum);
3394
3395 // End scratch_emit_size section.
3396 set_in_scratch_emit_size(false);
3397
3398 return buf.insts_size();
3399 }
3400
3401 void PhaseOutput::install() {
3402 if (C->should_install_code() && C->stub_function() != nullptr) {
3403 install_stub(C->stub_name());
3404 } else {
3405 install_code(C->method(),
3406 C->entry_bci(),
3407 CompilerThread::current()->compiler(),
3408 C->has_unsafe_access(),
3409 SharedRuntime::is_wide_vector(C->max_vector_size()));
3410 }
3411 }
3412
3413 void PhaseOutput::install_code(ciMethod* target,
3414 int entry_bci,
3415 AbstractCompiler* compiler,
3416 bool has_unsafe_access,
3417 bool has_wide_vectors) {
3418 // Check if we want to skip execution of all compiled code.
3419 {
3420 #ifndef PRODUCT
3421 if (OptoNoExecute) {
3422 C->record_method_not_compilable("+OptoNoExecute"); // Flag as failed
3423 return;
3424 }
3425 #endif
3426 Compile::TracePhase tp(_t_registerMethod);
3427
3428 if (C->is_osr_compilation()) {
3429 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
3430 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
3431 } else {
3432 if (!target->is_static()) {
3433 // The UEP of an nmethod ensures that the VEP is padded. However, the padding of the UEP is placed
3434 // before the inline cache check, so we don't have to execute any nop instructions when dispatching
3435 // through the UEP, yet we can ensure that the VEP is aligned appropriately.
3436 _code_offsets.set_value(CodeOffsets::Entry, _first_block_size - MacroAssembler::ic_check_size());
3437 }
3438 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
3439 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
3440 }
3441
3442 C->env()->register_method(target,
3443 entry_bci,
3444 &_code_offsets,
3445 _orig_pc_slot_offset_in_bytes,
3446 code_buffer(),
3447 frame_size_in_words(),
3448 oop_map_set(),
3449 &_handler_table,
3450 inc_table(),
3451 compiler,
3452 C->has_clinit_barriers(),
3453 C->for_preload(),
3454 has_unsafe_access,
3455 SharedRuntime::is_wide_vector(C->max_vector_size()),
3456 C->has_monitors(),
3457 C->has_scoped_access(),
3458 0,
3459 C->should_install_code());
3460
3461 if (C->log() != nullptr) { // Print code cache state into compiler log
3462 C->log()->code_cache_state();
3463 }
3464 assert(!C->has_clinit_barriers() || C->for_preload(), "class init barriers should be only in preload code");
3465 }
3466 }
3467 void PhaseOutput::install_stub(const char* stub_name) {
3468 // Entry point will be accessed using stub_entry_point();
3469 if (code_buffer() == nullptr) {
3470 Matcher::soft_match_failure();
3471 } else {
3472 if (PrintAssembly && (WizardMode || Verbose))
3473 tty->print_cr("### Stub::%s", stub_name);
3474
3475 if (!C->failing()) {
3476 assert(C->fixed_slots() == 0, "no fixed slots used for runtime stubs");
3477
3478 // Make the NMethod
3479 // For now we mark the frame as never safe for profile stackwalking
3480 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
3481 code_buffer(),
3482 CodeOffsets::frame_never_safe,
3483 // _code_offsets.value(CodeOffsets::Frame_Complete),
3484 frame_size_in_words(),
3485 oop_map_set(),
3486 false,
3487 false);
3488
3489 if (rs == nullptr) {
3490 C->record_failure("CodeCache is full");
3491 } else {
3492 assert(rs->is_runtime_stub(), "sanity check");
3493 C->set_stub_entry_point(rs->entry_point());
3494 AOTCodeCache::store_code_blob(*rs, AOTCodeEntry::C2Blob, C->stub_id(), stub_name);
3495 }
3496 }
3497 }
3498 }
3499
3500 // Support for bundling info
3501 Bundle* PhaseOutput::node_bundling(const Node *n) {
3502 assert(valid_bundle_info(n), "oob");
3503 return &_node_bundling_base[n->_idx];
3504 }
3505
3506 bool PhaseOutput::valid_bundle_info(const Node *n) {
3507 return (_node_bundling_limit > n->_idx);
3508 }
3509
3510 //------------------------------frame_size_in_words-----------------------------
3511 // frame_slots in units of words
3512 int PhaseOutput::frame_size_in_words() const {
3513 // shift is 0 in LP32 and 1 in LP64
3514 const int shift = (LogBytesPerWord - LogBytesPerInt);
3515 int words = _frame_slots >> shift;
3516 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
3517 return words;
3518 }
3519
3520 // To bang the stack of this compiled method we use the stack size
3521 // that the interpreter would need in case of a deoptimization. This
3522 // removes the need to bang the stack in the deoptimization blob which
3523 // in turn simplifies stack overflow handling.
3524 int PhaseOutput::bang_size_in_bytes() const {
3525 return MAX2(frame_size_in_bytes() + os::extra_bang_size_in_bytes(), C->interpreter_frame_size());
3526 }
3527
3528 //------------------------------dump_asm---------------------------------------
3529 // Dump formatted assembly
3530 #if defined(SUPPORT_OPTO_ASSEMBLY)
3531 void PhaseOutput::dump_asm_on(outputStream* st, int* pcs, uint pc_limit) {
3532
3533 int pc_digits = 3; // #chars required for pc
3534 int sb_chars = 3; // #chars for "start bundle" indicator
3535 int tab_size = 8;
3536 if (pcs != nullptr) {
3537 int max_pc = 0;
3538 for (uint i = 0; i < pc_limit; i++) {
3539 max_pc = (max_pc < pcs[i]) ? pcs[i] : max_pc;
3540 }
3541 pc_digits = ((max_pc < 4096) ? 3 : ((max_pc < 65536) ? 4 : ((max_pc < 65536*256) ? 6 : 8))); // #chars required for pc
3542 }
3543 int prefix_len = ((pc_digits + sb_chars + tab_size - 1)/tab_size)*tab_size;
3544
3545 bool cut_short = false;
3546 st->print_cr("#");
3547 st->print("# "); C->tf()->dump_on(st); st->cr();
3548 st->print_cr("#");
3549
3550 // For all blocks
3551 int pc = 0x0; // Program counter
3552 char starts_bundle = ' ';
3553 C->regalloc()->dump_frame();
3554
3555 Node *n = nullptr;
3556 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
3557 if (VMThread::should_terminate()) {
3558 cut_short = true;
3559 break;
3560 }
3561 Block* block = C->cfg()->get_block(i);
3562 if (block->is_connector() && !Verbose) {
3563 continue;
3564 }
3565 n = block->head();
3566 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3567 pc = pcs[n->_idx];
3568 st->print("%*.*x", pc_digits, pc_digits, pc);
3569 }
3570 st->fill_to(prefix_len);
3571 block->dump_head(C->cfg(), st);
3572 if (block->is_connector()) {
3573 st->fill_to(prefix_len);
3574 st->print_cr("# Empty connector block");
3575 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
3576 st->fill_to(prefix_len);
3577 st->print_cr("# Block is sole successor of call");
3578 }
3579
3580 // For all instructions
3581 Node *delay = nullptr;
3582 for (uint j = 0; j < block->number_of_nodes(); j++) {
3583 if (VMThread::should_terminate()) {
3584 cut_short = true;
3585 break;
3586 }
3587 n = block->get_node(j);
3588 if (valid_bundle_info(n)) {
3589 Bundle* bundle = node_bundling(n);
3590 if (bundle->used_in_unconditional_delay()) {
3591 delay = n;
3592 continue;
3593 }
3594 if (bundle->starts_bundle()) {
3595 starts_bundle = '+';
3596 }
3597 }
3598
3599 if (WizardMode) {
3600 n->dump();
3601 }
3602
3603 if( !n->is_Region() && // Dont print in the Assembly
3604 !n->is_Phi() && // a few noisely useless nodes
3605 !n->is_Proj() &&
3606 !n->is_MachTemp() &&
3607 !n->is_SafePointScalarObject() &&
3608 !n->is_Catch() && // Would be nice to print exception table targets
3609 !n->is_MergeMem() && // Not very interesting
3610 !n->is_top() && // Debug info table constants
3611 !(n->is_Con() && !n->is_Mach())// Debug info table constants
3612 ) {
3613 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3614 pc = pcs[n->_idx];
3615 st->print("%*.*x", pc_digits, pc_digits, pc);
3616 } else {
3617 st->fill_to(pc_digits);
3618 }
3619 st->print(" %c ", starts_bundle);
3620 starts_bundle = ' ';
3621 st->fill_to(prefix_len);
3622 n->format(C->regalloc(), st);
3623 st->cr();
3624 }
3625
3626 // If we have an instruction with a delay slot, and have seen a delay,
3627 // then back up and print it
3628 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
3629 // Coverity finding - Explicit null dereferenced.
3630 guarantee(delay != nullptr, "no unconditional delay instruction");
3631 if (WizardMode) delay->dump();
3632
3633 if (node_bundling(delay)->starts_bundle())
3634 starts_bundle = '+';
3635 if ((pcs != nullptr) && (n->_idx < pc_limit)) {
3636 pc = pcs[n->_idx];
3637 st->print("%*.*x", pc_digits, pc_digits, pc);
3638 } else {
3639 st->fill_to(pc_digits);
3640 }
3641 st->print(" %c ", starts_bundle);
3642 starts_bundle = ' ';
3643 st->fill_to(prefix_len);
3644 delay->format(C->regalloc(), st);
3645 st->cr();
3646 delay = nullptr;
3647 }
3648
3649 // Dump the exception table as well
3650 if( n->is_Catch() && (Verbose || WizardMode) ) {
3651 // Print the exception table for this offset
3652 _handler_table.print_subtable_for(pc);
3653 }
3654 st->bol(); // Make sure we start on a new line
3655 }
3656 st->cr(); // one empty line between blocks
3657 assert(cut_short || delay == nullptr, "no unconditional delay branch");
3658 } // End of per-block dump
3659
3660 if (cut_short) st->print_cr("*** disassembly is cut short ***");
3661 }
3662 #endif
3663
3664 #ifndef PRODUCT
3665 void PhaseOutput::print_statistics() {
3666 Scheduling::print_statistics();
3667 }
3668 #endif
3669
3670 int PhaseOutput::max_inst_size() {
3671 if (AOTCodeCache::maybe_dumping_code()) {
3672 // See the comment in output.hpp.
3673 return 16384;
3674 } else {
3675 return mainline_MAX_inst_size;
3676 }
3677 }
3678
3679 int PhaseOutput::max_inst_gcstub_size() {
3680 assert(mainline_MAX_inst_size <= max_inst_size(), "Sanity");
3681 return mainline_MAX_inst_size;
3682 }