1 /*
2 * Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/assembler.inline.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/debugInfo.hpp"
30 #include "code/debugInfoRec.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/compilerDirectives.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/shared/barrierSet.hpp"
36 #include "gc/shared/gc_globals.hpp"
37 #include "gc/shared/c2/barrierSetC2.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/allocation.hpp"
40 #include "opto/ad.hpp"
41 #include "opto/block.hpp"
42 #include "opto/c2compiler.hpp"
43 #include "opto/callnode.hpp"
44 #include "opto/cfgnode.hpp"
45 #include "opto/locknode.hpp"
46 #include "opto/machnode.hpp"
47 #include "opto/node.hpp"
48 #include "opto/optoreg.hpp"
49 #include "opto/output.hpp"
50 #include "opto/regalloc.hpp"
51 #include "opto/runtime.hpp"
52 #include "opto/subnode.hpp"
53 #include "opto/type.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "utilities/macros.hpp"
57 #include "utilities/powerOfTwo.hpp"
58 #include "utilities/xmlstream.hpp"
59
60 #ifndef PRODUCT
61 #define DEBUG_ARG(x) , x
62 #else
63 #define DEBUG_ARG(x)
64 #endif
65
66 //------------------------------Scheduling----------------------------------
67 // This class contains all the information necessary to implement instruction
68 // scheduling and bundling.
69 class Scheduling {
70
71 private:
72 // Arena to use
73 Arena *_arena;
74
75 // Control-Flow Graph info
76 PhaseCFG *_cfg;
77
78 // Register Allocation info
79 PhaseRegAlloc *_regalloc;
80
81 // Number of nodes in the method
82 uint _node_bundling_limit;
83
84 // List of scheduled nodes. Generated in reverse order
85 Node_List _scheduled;
86
87 // List of nodes currently available for choosing for scheduling
88 Node_List _available;
89
90 // For each instruction beginning a bundle, the number of following
91 // nodes to be bundled with it.
92 Bundle *_node_bundling_base;
93
94 // Mapping from register to Node
95 Node_List _reg_node;
96
97 // Free list for pinch nodes.
98 Node_List _pinch_free_list;
99
100 // Latency from the beginning of the containing basic block (base 1)
101 // for each node.
102 unsigned short *_node_latency;
103
104 // Number of uses of this node within the containing basic block.
105 short *_uses;
106
107 // Schedulable portion of current block. Skips Region/Phi/CreateEx up
108 // front, branch+proj at end. Also skips Catch/CProj (same as
109 // branch-at-end), plus just-prior exception-throwing call.
110 uint _bb_start, _bb_end;
111
112 // Latency from the end of the basic block as scheduled
113 unsigned short *_current_latency;
114
115 // Remember the next node
116 Node *_next_node;
117
118 // Use this for an unconditional branch delay slot
119 Node *_unconditional_delay_slot;
120
121 // Pointer to a Nop
122 MachNopNode *_nop;
123
124 // Length of the current bundle, in instructions
125 uint _bundle_instr_count;
126
127 // Current Cycle number, for computing latencies and bundling
128 uint _bundle_cycle_number;
129
130 // Bundle information
131 Pipeline_Use_Element _bundle_use_elements[resource_count];
132 Pipeline_Use _bundle_use;
133
134 // Dump the available list
135 void dump_available() const;
136
137 public:
138 Scheduling(Arena *arena, Compile &compile);
139
140 // Destructor
141 NOT_PRODUCT( ~Scheduling(); )
142
143 // Step ahead "i" cycles
144 void step(uint i);
145
146 // Step ahead 1 cycle, and clear the bundle state (for example,
147 // at a branch target)
148 void step_and_clear();
149
150 Bundle* node_bundling(const Node *n) {
151 assert(valid_bundle_info(n), "oob");
152 return (&_node_bundling_base[n->_idx]);
153 }
154
155 bool valid_bundle_info(const Node *n) const {
156 return (_node_bundling_limit > n->_idx);
157 }
158
159 bool starts_bundle(const Node *n) const {
160 return (_node_bundling_limit > n->_idx && _node_bundling_base[n->_idx].starts_bundle());
161 }
162
163 // Do the scheduling
164 void DoScheduling();
165
166 // Compute the local latencies walking forward over the list of
167 // nodes for a basic block
168 void ComputeLocalLatenciesForward(const Block *bb);
169
170 // Compute the register antidependencies within a basic block
171 void ComputeRegisterAntidependencies(Block *bb);
172 void verify_do_def( Node *n, OptoReg::Name def, const char *msg );
173 void verify_good_schedule( Block *b, const char *msg );
174 void anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def );
175 void anti_do_use( Block *b, Node *use, OptoReg::Name use_reg );
176
177 // Add a node to the current bundle
178 void AddNodeToBundle(Node *n, const Block *bb);
179
180 // Add a node to the list of available nodes
181 void AddNodeToAvailableList(Node *n);
182
183 // Compute the local use count for the nodes in a block, and compute
184 // the list of instructions with no uses in the block as available
185 void ComputeUseCount(const Block *bb);
186
187 // Choose an instruction from the available list to add to the bundle
188 Node * ChooseNodeToBundle();
189
190 // See if this Node fits into the currently accumulating bundle
191 bool NodeFitsInBundle(Node *n);
192
193 // Decrement the use count for a node
194 void DecrementUseCounts(Node *n, const Block *bb);
195
196 // Garbage collect pinch nodes for reuse by other blocks.
197 void garbage_collect_pinch_nodes();
198 // Clean up a pinch node for reuse (helper for above).
199 void cleanup_pinch( Node *pinch );
200
201 // Information for statistics gathering
202 #ifndef PRODUCT
203 private:
204 // Gather information on size of nops relative to total
205 uint _branches, _unconditional_delays;
206
207 static uint _total_nop_size, _total_method_size;
208 static uint _total_branches, _total_unconditional_delays;
209 static uint _total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
210
211 public:
212 static void print_statistics();
213
214 static void increment_instructions_per_bundle(uint i) {
215 _total_instructions_per_bundle[i]++;
216 }
217
218 static void increment_nop_size(uint s) {
219 _total_nop_size += s;
220 }
221
222 static void increment_method_size(uint s) {
223 _total_method_size += s;
224 }
225 #endif
226
227 };
228
229 volatile int C2SafepointPollStubTable::_stub_size = 0;
230
231 Label& C2SafepointPollStubTable::add_safepoint(uintptr_t safepoint_offset) {
232 C2SafepointPollStub* entry = new (Compile::current()->comp_arena()) C2SafepointPollStub(safepoint_offset);
233 _safepoints.append(entry);
234 return entry->_stub_label;
235 }
236
237 void C2SafepointPollStubTable::emit(CodeBuffer& cb) {
238 MacroAssembler masm(&cb);
239 for (int i = _safepoints.length() - 1; i >= 0; i--) {
240 // Make sure there is enough space in the code buffer
241 if (cb.insts()->maybe_expand_to_ensure_remaining(PhaseOutput::MAX_inst_size) && cb.blob() == NULL) {
242 ciEnv::current()->record_failure("CodeCache is full");
243 return;
244 }
245
246 C2SafepointPollStub* entry = _safepoints.at(i);
247 emit_stub(masm, entry);
248 }
249 }
250
251 int C2SafepointPollStubTable::stub_size_lazy() const {
252 int size = Atomic::load(&_stub_size);
253
254 if (size != 0) {
255 return size;
256 }
257
258 Compile* const C = Compile::current();
259 BufferBlob* const blob = C->output()->scratch_buffer_blob();
260 CodeBuffer cb(blob->content_begin(), C->output()->scratch_buffer_code_size());
261 MacroAssembler masm(&cb);
262 C2SafepointPollStub* entry = _safepoints.at(0);
263 emit_stub(masm, entry);
264 size += cb.insts_size();
265
266 Atomic::store(&_stub_size, size);
267
268 return size;
269 }
270
271 int C2SafepointPollStubTable::estimate_stub_size() const {
272 if (_safepoints.length() == 0) {
273 return 0;
274 }
275
276 int result = stub_size_lazy() * _safepoints.length();
277
278 #ifdef ASSERT
279 Compile* const C = Compile::current();
280 BufferBlob* const blob = C->output()->scratch_buffer_blob();
281 int size = 0;
282
283 for (int i = _safepoints.length() - 1; i >= 0; i--) {
284 CodeBuffer cb(blob->content_begin(), C->output()->scratch_buffer_code_size());
285 MacroAssembler masm(&cb);
286 C2SafepointPollStub* entry = _safepoints.at(i);
287 emit_stub(masm, entry);
288 size += cb.insts_size();
289 }
290 assert(size == result, "stubs should not have variable size");
291 #endif
292
293 return result;
294 }
295
296 PhaseOutput::PhaseOutput()
297 : Phase(Phase::Output),
298 _code_buffer("Compile::Fill_buffer"),
299 _first_block_size(0),
300 _handler_table(),
301 _inc_table(),
302 _oop_map_set(NULL),
303 _scratch_buffer_blob(NULL),
304 _scratch_locs_memory(NULL),
305 _scratch_const_size(-1),
306 _in_scratch_emit_size(false),
307 _frame_slots(0),
308 _code_offsets(),
309 _node_bundling_limit(0),
310 _node_bundling_base(NULL),
311 _orig_pc_slot(0),
312 _orig_pc_slot_offset_in_bytes(0),
313 _sp_inc_slot(0),
314 _buf_sizes(),
315 _block(NULL),
316 _index(0) {
317 C->set_output(this);
318 if (C->stub_name() == NULL) {
319 int fixed_slots = C->fixed_slots();
320 if (C->needs_stack_repair()) {
321 fixed_slots -= 2;
322 _sp_inc_slot = fixed_slots;
323 }
324 _orig_pc_slot = fixed_slots - (sizeof(address) / VMRegImpl::stack_slot_size);
325 }
326 }
327
328 PhaseOutput::~PhaseOutput() {
329 C->set_output(NULL);
330 if (_scratch_buffer_blob != NULL) {
331 BufferBlob::free(_scratch_buffer_blob);
332 }
333 }
334
335 void PhaseOutput::perform_mach_node_analysis() {
336 // Late barrier analysis must be done after schedule and bundle
337 // Otherwise liveness based spilling will fail
338 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
339 bs->late_barrier_analysis();
340
341 pd_perform_mach_node_analysis();
342 }
343
344 // Convert Nodes to instruction bits and pass off to the VM
345 void PhaseOutput::Output() {
346 // RootNode goes
347 assert( C->cfg()->get_root_block()->number_of_nodes() == 0, "" );
348
349 // The number of new nodes (mostly MachNop) is proportional to
350 // the number of java calls and inner loops which are aligned.
351 if ( C->check_node_count((NodeLimitFudgeFactor + C->java_calls()*3 +
352 C->inner_loops()*(OptoLoopAlignment-1)),
353 "out of nodes before code generation" ) ) {
354 return;
355 }
356 // Make sure I can find the Start Node
357 Block *entry = C->cfg()->get_block(1);
358 Block *broot = C->cfg()->get_root_block();
359
360 const StartNode *start = entry->head()->as_Start();
361
362 // Replace StartNode with prolog
363 Label verified_entry;
364 MachPrologNode* prolog = new MachPrologNode(&verified_entry);
365 entry->map_node(prolog, 0);
366 C->cfg()->map_node_to_block(prolog, entry);
367 C->cfg()->unmap_node_from_block(start); // start is no longer in any block
368
369 // Virtual methods need an unverified entry point
370 if (C->is_osr_compilation()) {
371 if (PoisonOSREntry) {
372 // TODO: Should use a ShouldNotReachHereNode...
373 C->cfg()->insert( broot, 0, new MachBreakpointNode() );
374 }
375 } else {
376 if (C->method()) {
377 if (C->method()->has_scalarized_args()) {
378 // Add entry point to unpack all inline type arguments
379 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ true, /* receiver_only */ false));
380 if (!C->method()->is_static()) {
381 // Add verified/unverified entry points to only unpack inline type receiver at interface calls
382 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ false, /* receiver_only */ false));
383 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ true, /* receiver_only */ true));
384 C->cfg()->insert(broot, 0, new MachVEPNode(&verified_entry, /* verified */ false, /* receiver_only */ true));
385 }
386 } else if (!C->method()->is_static()) {
387 // Insert unvalidated entry point
388 C->cfg()->insert(broot, 0, new MachUEPNode());
389 }
390 }
391 }
392
393 // Break before main entry point
394 if ((C->method() && C->directive()->BreakAtExecuteOption) ||
395 (OptoBreakpoint && C->is_method_compilation()) ||
396 (OptoBreakpointOSR && C->is_osr_compilation()) ||
397 (OptoBreakpointC2R && !C->method()) ) {
398 // checking for C->method() means that OptoBreakpoint does not apply to
399 // runtime stubs or frame converters
400 C->cfg()->insert( entry, 1, new MachBreakpointNode() );
401 }
402
403 // Insert epilogs before every return
404 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
405 Block* block = C->cfg()->get_block(i);
406 if (!block->is_connector() && block->non_connector_successor(0) == C->cfg()->get_root_block()) { // Found a program exit point?
407 Node* m = block->end();
408 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() != Op_Halt) {
409 MachEpilogNode* epilog = new MachEpilogNode(m->as_Mach()->ideal_Opcode() == Op_Return);
410 block->add_inst(epilog);
411 C->cfg()->map_node_to_block(epilog, block);
412 }
413 }
414 }
415
416 // Keeper of sizing aspects
417 _buf_sizes = BufferSizingData();
418
419 // Initialize code buffer
420 estimate_buffer_size(_buf_sizes._const);
421 if (C->failing()) return;
422
423 // Pre-compute the length of blocks and replace
424 // long branches with short if machine supports it.
425 // Must be done before ScheduleAndBundle due to SPARC delay slots
426 uint* blk_starts = NEW_RESOURCE_ARRAY(uint, C->cfg()->number_of_blocks() + 1);
427 blk_starts[0] = 0;
428 shorten_branches(blk_starts);
429
430 if (!C->is_osr_compilation() && C->has_scalarized_args()) {
431 // Compute the offsets of the entry points required by the inline type calling convention
432 if (!C->method()->is_static()) {
433 // We have entries at the beginning of the method, implemented by the first 4 nodes.
434 // Entry (unverified) @ offset 0
435 // Verified_Inline_Entry_RO
436 // Inline_Entry (unverified)
437 // Verified_Inline_Entry
438 uint offset = 0;
439 _code_offsets.set_value(CodeOffsets::Entry, offset);
440
441 offset += ((MachVEPNode*)broot->get_node(0))->size(C->regalloc());
442 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry_RO, offset);
443
444 offset += ((MachVEPNode*)broot->get_node(1))->size(C->regalloc());
445 _code_offsets.set_value(CodeOffsets::Inline_Entry, offset);
446
447 offset += ((MachVEPNode*)broot->get_node(2))->size(C->regalloc());
448 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry, offset);
449 } else {
450 _code_offsets.set_value(CodeOffsets::Entry, -1); // will be patched later
451 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry, 0);
452 }
453 }
454
455 ScheduleAndBundle();
456 if (C->failing()) {
457 return;
458 }
459
460 perform_mach_node_analysis();
461
462 // Complete sizing of codebuffer
463 CodeBuffer* cb = init_buffer();
464 if (cb == NULL || C->failing()) {
465 return;
466 }
467
468 BuildOopMaps();
469
470 if (C->failing()) {
471 return;
472 }
473
474 fill_buffer(cb, blk_starts);
475 }
476
477 bool PhaseOutput::need_stack_bang(int frame_size_in_bytes) const {
478 // Determine if we need to generate a stack overflow check.
479 // Do it if the method is not a stub function and
480 // has java calls or has frame size > vm_page_size/8.
481 // The debug VM checks that deoptimization doesn't trigger an
482 // unexpected stack overflow (compiled method stack banging should
483 // guarantee it doesn't happen) so we always need the stack bang in
484 // a debug VM.
485 return (C->stub_function() == NULL &&
486 (C->has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3
487 DEBUG_ONLY(|| true)));
488 }
489
490 bool PhaseOutput::need_register_stack_bang() const {
491 // Determine if we need to generate a register stack overflow check.
492 // This is only used on architectures which have split register
493 // and memory stacks (ie. IA64).
494 // Bang if the method is not a stub function and has java calls
495 return (C->stub_function() == NULL && C->has_java_calls());
496 }
497
498
499 // Compute the size of first NumberOfLoopInstrToAlign instructions at the top
500 // of a loop. When aligning a loop we need to provide enough instructions
501 // in cpu's fetch buffer to feed decoders. The loop alignment could be
502 // avoided if we have enough instructions in fetch buffer at the head of a loop.
503 // By default, the size is set to 999999 by Block's constructor so that
504 // a loop will be aligned if the size is not reset here.
505 //
506 // Note: Mach instructions could contain several HW instructions
507 // so the size is estimated only.
508 //
509 void PhaseOutput::compute_loop_first_inst_sizes() {
510 // The next condition is used to gate the loop alignment optimization.
511 // Don't aligned a loop if there are enough instructions at the head of a loop
512 // or alignment padding is larger then MaxLoopPad. By default, MaxLoopPad
513 // is equal to OptoLoopAlignment-1 except on new Intel cpus, where it is
514 // equal to 11 bytes which is the largest address NOP instruction.
515 if (MaxLoopPad < OptoLoopAlignment - 1) {
516 uint last_block = C->cfg()->number_of_blocks() - 1;
517 for (uint i = 1; i <= last_block; i++) {
518 Block* block = C->cfg()->get_block(i);
519 // Check the first loop's block which requires an alignment.
520 if (block->loop_alignment() > (uint)relocInfo::addr_unit()) {
521 uint sum_size = 0;
522 uint inst_cnt = NumberOfLoopInstrToAlign;
523 inst_cnt = block->compute_first_inst_size(sum_size, inst_cnt, C->regalloc());
524
525 // Check subsequent fallthrough blocks if the loop's first
526 // block(s) does not have enough instructions.
527 Block *nb = block;
528 while(inst_cnt > 0 &&
529 i < last_block &&
530 !C->cfg()->get_block(i + 1)->has_loop_alignment() &&
531 !nb->has_successor(block)) {
532 i++;
533 nb = C->cfg()->get_block(i);
534 inst_cnt = nb->compute_first_inst_size(sum_size, inst_cnt, C->regalloc());
535 } // while( inst_cnt > 0 && i < last_block )
536
537 block->set_first_inst_size(sum_size);
538 } // f( b->head()->is_Loop() )
539 } // for( i <= last_block )
540 } // if( MaxLoopPad < OptoLoopAlignment-1 )
541 }
542
543 // The architecture description provides short branch variants for some long
544 // branch instructions. Replace eligible long branches with short branches.
545 void PhaseOutput::shorten_branches(uint* blk_starts) {
546
547 Compile::TracePhase tp("shorten branches", &timers[_t_shortenBranches]);
548
549 // Compute size of each block, method size, and relocation information size
550 uint nblocks = C->cfg()->number_of_blocks();
551
552 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
553 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
554 int* jmp_nidx = NEW_RESOURCE_ARRAY(int ,nblocks);
555
556 // Collect worst case block paddings
557 int* block_worst_case_pad = NEW_RESOURCE_ARRAY(int, nblocks);
558 memset(block_worst_case_pad, 0, nblocks * sizeof(int));
559
560 DEBUG_ONLY( uint *jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks); )
561 DEBUG_ONLY( uint *jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks); )
562
563 bool has_short_branch_candidate = false;
564
565 // Initialize the sizes to 0
566 int code_size = 0; // Size in bytes of generated code
567 int stub_size = 0; // Size in bytes of all stub entries
568 // Size in bytes of all relocation entries, including those in local stubs.
569 // Start with 2-bytes of reloc info for the unvalidated entry point
570 int reloc_size = 1; // Number of relocation entries
571
572 // Make three passes. The first computes pessimistic blk_starts,
573 // relative jmp_offset and reloc_size information. The second performs
574 // short branch substitution using the pessimistic sizing. The
575 // third inserts nops where needed.
576
577 // Step one, perform a pessimistic sizing pass.
578 uint last_call_adr = max_juint;
579 uint last_avoid_back_to_back_adr = max_juint;
580 uint nop_size = (new MachNopNode())->size(C->regalloc());
581 for (uint i = 0; i < nblocks; i++) { // For all blocks
582 Block* block = C->cfg()->get_block(i);
583 _block = block;
584
585 // During short branch replacement, we store the relative (to blk_starts)
586 // offset of jump in jmp_offset, rather than the absolute offset of jump.
587 // This is so that we do not need to recompute sizes of all nodes when
588 // we compute correct blk_starts in our next sizing pass.
589 jmp_offset[i] = 0;
590 jmp_size[i] = 0;
591 jmp_nidx[i] = -1;
592 DEBUG_ONLY( jmp_target[i] = 0; )
593 DEBUG_ONLY( jmp_rule[i] = 0; )
594
595 // Sum all instruction sizes to compute block size
596 uint last_inst = block->number_of_nodes();
597 uint blk_size = 0;
598 for (uint j = 0; j < last_inst; j++) {
599 _index = j;
600 Node* nj = block->get_node(_index);
601 // Handle machine instruction nodes
602 if (nj->is_Mach()) {
603 MachNode* mach = nj->as_Mach();
604 blk_size += (mach->alignment_required() - 1) * relocInfo::addr_unit(); // assume worst case padding
605 reloc_size += mach->reloc();
606 if (mach->is_MachCall()) {
607 // add size information for trampoline stub
608 // class CallStubImpl is platform-specific and defined in the *.ad files.
609 stub_size += CallStubImpl::size_call_trampoline();
610 reloc_size += CallStubImpl::reloc_call_trampoline();
611
612 MachCallNode *mcall = mach->as_MachCall();
613 // This destination address is NOT PC-relative
614
615 if (mcall->entry_point() != NULL) {
616 mcall->method_set((intptr_t)mcall->entry_point());
617 }
618
619 if (mcall->is_MachCallJava() && mcall->as_MachCallJava()->_method) {
620 stub_size += CompiledStaticCall::to_interp_stub_size();
621 reloc_size += CompiledStaticCall::reloc_to_interp_stub();
622 }
623 } else if (mach->is_MachSafePoint()) {
624 // If call/safepoint are adjacent, account for possible
625 // nop to disambiguate the two safepoints.
626 // ScheduleAndBundle() can rearrange nodes in a block,
627 // check for all offsets inside this block.
628 if (last_call_adr >= blk_starts[i]) {
629 blk_size += nop_size;
630 }
631 }
632 if (mach->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
633 // Nop is inserted between "avoid back to back" instructions.
634 // ScheduleAndBundle() can rearrange nodes in a block,
635 // check for all offsets inside this block.
636 if (last_avoid_back_to_back_adr >= blk_starts[i]) {
637 blk_size += nop_size;
638 }
639 }
640 if (mach->may_be_short_branch()) {
641 if (!nj->is_MachBranch()) {
642 #ifndef PRODUCT
643 nj->dump(3);
644 #endif
645 Unimplemented();
646 }
647 assert(jmp_nidx[i] == -1, "block should have only one branch");
648 jmp_offset[i] = blk_size;
649 jmp_size[i] = nj->size(C->regalloc());
650 jmp_nidx[i] = j;
651 has_short_branch_candidate = true;
652 }
653 }
654 blk_size += nj->size(C->regalloc());
655 // Remember end of call offset
656 if (nj->is_MachCall() && !nj->is_MachCallLeaf()) {
657 last_call_adr = blk_starts[i]+blk_size;
658 }
659 // Remember end of avoid_back_to_back offset
660 if (nj->is_Mach() && nj->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
661 last_avoid_back_to_back_adr = blk_starts[i]+blk_size;
662 }
663 }
664
665 // When the next block starts a loop, we may insert pad NOP
666 // instructions. Since we cannot know our future alignment,
667 // assume the worst.
668 if (i < nblocks - 1) {
669 Block* nb = C->cfg()->get_block(i + 1);
670 int max_loop_pad = nb->code_alignment()-relocInfo::addr_unit();
671 if (max_loop_pad > 0) {
672 assert(is_power_of_2(max_loop_pad+relocInfo::addr_unit()), "");
673 // Adjust last_call_adr and/or last_avoid_back_to_back_adr.
674 // If either is the last instruction in this block, bump by
675 // max_loop_pad in lock-step with blk_size, so sizing
676 // calculations in subsequent blocks still can conservatively
677 // detect that it may the last instruction in this block.
678 if (last_call_adr == blk_starts[i]+blk_size) {
679 last_call_adr += max_loop_pad;
680 }
681 if (last_avoid_back_to_back_adr == blk_starts[i]+blk_size) {
682 last_avoid_back_to_back_adr += max_loop_pad;
683 }
684 blk_size += max_loop_pad;
685 block_worst_case_pad[i + 1] = max_loop_pad;
686 }
687 }
688
689 // Save block size; update total method size
690 blk_starts[i+1] = blk_starts[i]+blk_size;
691 }
692
693 // Step two, replace eligible long jumps.
694 bool progress = true;
695 uint last_may_be_short_branch_adr = max_juint;
696 while (has_short_branch_candidate && progress) {
697 progress = false;
698 has_short_branch_candidate = false;
699 int adjust_block_start = 0;
700 for (uint i = 0; i < nblocks; i++) {
701 Block* block = C->cfg()->get_block(i);
702 int idx = jmp_nidx[i];
703 MachNode* mach = (idx == -1) ? NULL: block->get_node(idx)->as_Mach();
704 if (mach != NULL && mach->may_be_short_branch()) {
705 #ifdef ASSERT
706 assert(jmp_size[i] > 0 && mach->is_MachBranch(), "sanity");
707 int j;
708 // Find the branch; ignore trailing NOPs.
709 for (j = block->number_of_nodes()-1; j>=0; j--) {
710 Node* n = block->get_node(j);
711 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con)
712 break;
713 }
714 assert(j >= 0 && j == idx && block->get_node(j) == (Node*)mach, "sanity");
715 #endif
716 int br_size = jmp_size[i];
717 int br_offs = blk_starts[i] + jmp_offset[i];
718
719 // This requires the TRUE branch target be in succs[0]
720 uint bnum = block->non_connector_successor(0)->_pre_order;
721 int offset = blk_starts[bnum] - br_offs;
722 if (bnum > i) { // adjust following block's offset
723 offset -= adjust_block_start;
724 }
725
726 // This block can be a loop header, account for the padding
727 // in the previous block.
728 int block_padding = block_worst_case_pad[i];
729 assert(i == 0 || block_padding == 0 || br_offs >= block_padding, "Should have at least a padding on top");
730 // In the following code a nop could be inserted before
731 // the branch which will increase the backward distance.
732 bool needs_padding = ((uint)(br_offs - block_padding) == last_may_be_short_branch_adr);
733 assert(!needs_padding || jmp_offset[i] == 0, "padding only branches at the beginning of block");
734
735 if (needs_padding && offset <= 0)
736 offset -= nop_size;
737
738 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
739 // We've got a winner. Replace this branch.
740 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
741
742 // Update the jmp_size.
743 int new_size = replacement->size(C->regalloc());
744 int diff = br_size - new_size;
745 assert(diff >= (int)nop_size, "short_branch size should be smaller");
746 // Conservatively take into account padding between
747 // avoid_back_to_back branches. Previous branch could be
748 // converted into avoid_back_to_back branch during next
749 // rounds.
750 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
751 jmp_offset[i] += nop_size;
752 diff -= nop_size;
753 }
754 adjust_block_start += diff;
755 block->map_node(replacement, idx);
756 mach->subsume_by(replacement, C);
757 mach = replacement;
758 progress = true;
759
760 jmp_size[i] = new_size;
761 DEBUG_ONLY( jmp_target[i] = bnum; );
762 DEBUG_ONLY( jmp_rule[i] = mach->rule(); );
763 } else {
764 // The jump distance is not short, try again during next iteration.
765 has_short_branch_candidate = true;
766 }
767 } // (mach->may_be_short_branch())
768 if (mach != NULL && (mach->may_be_short_branch() ||
769 mach->avoid_back_to_back(MachNode::AVOID_AFTER))) {
770 last_may_be_short_branch_adr = blk_starts[i] + jmp_offset[i] + jmp_size[i];
771 }
772 blk_starts[i+1] -= adjust_block_start;
773 }
774 }
775
776 #ifdef ASSERT
777 for (uint i = 0; i < nblocks; i++) { // For all blocks
778 if (jmp_target[i] != 0) {
779 int br_size = jmp_size[i];
780 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
781 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
782 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]);
783 }
784 assert(C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset), "Displacement too large for short jmp");
785 }
786 }
787 #endif
788
789 // Step 3, compute the offsets of all blocks, will be done in fill_buffer()
790 // after ScheduleAndBundle().
791
792 // ------------------
793 // Compute size for code buffer
794 code_size = blk_starts[nblocks];
795
796 // Relocation records
797 reloc_size += 1; // Relo entry for exception handler
798
799 // Adjust reloc_size to number of record of relocation info
800 // Min is 2 bytes, max is probably 6 or 8, with a tax up to 25% for
801 // a relocation index.
802 // The CodeBuffer will expand the locs array if this estimate is too low.
803 reloc_size *= 10 / sizeof(relocInfo);
804
805 _buf_sizes._reloc = reloc_size;
806 _buf_sizes._code = code_size;
807 _buf_sizes._stub = stub_size;
808 }
809
810 //------------------------------FillLocArray-----------------------------------
811 // Create a bit of debug info and append it to the array. The mapping is from
812 // Java local or expression stack to constant, register or stack-slot. For
813 // doubles, insert 2 mappings and return 1 (to tell the caller that the next
814 // entry has been taken care of and caller should skip it).
815 static LocationValue *new_loc_value( PhaseRegAlloc *ra, OptoReg::Name regnum, Location::Type l_type ) {
816 // This should never have accepted Bad before
817 assert(OptoReg::is_valid(regnum), "location must be valid");
818 return (OptoReg::is_reg(regnum))
819 ? new LocationValue(Location::new_reg_loc(l_type, OptoReg::as_VMReg(regnum)) )
820 : new LocationValue(Location::new_stk_loc(l_type, ra->reg2offset(regnum)));
821 }
822
823
824 ObjectValue*
825 PhaseOutput::sv_for_node_id(GrowableArray<ScopeValue*> *objs, int id) {
826 for (int i = 0; i < objs->length(); i++) {
827 assert(objs->at(i)->is_object(), "corrupt object cache");
828 ObjectValue* sv = (ObjectValue*) objs->at(i);
829 if (sv->id() == id) {
830 return sv;
831 }
832 }
833 // Otherwise..
834 return NULL;
835 }
836
837 void PhaseOutput::set_sv_for_object_node(GrowableArray<ScopeValue*> *objs,
838 ObjectValue* sv ) {
839 assert(sv_for_node_id(objs, sv->id()) == NULL, "Precondition");
840 objs->append(sv);
841 }
842
843
844 void PhaseOutput::FillLocArray( int idx, MachSafePointNode* sfpt, Node *local,
845 GrowableArray<ScopeValue*> *array,
846 GrowableArray<ScopeValue*> *objs ) {
847 assert( local, "use _top instead of null" );
848 if (array->length() != idx) {
849 assert(array->length() == idx + 1, "Unexpected array count");
850 // Old functionality:
851 // return
852 // New functionality:
853 // Assert if the local is not top. In product mode let the new node
854 // override the old entry.
855 assert(local == C->top(), "LocArray collision");
856 if (local == C->top()) {
857 return;
858 }
859 array->pop();
860 }
861 const Type *t = local->bottom_type();
862
863 // Is it a safepoint scalar object node?
864 if (local->is_SafePointScalarObject()) {
865 SafePointScalarObjectNode* spobj = local->as_SafePointScalarObject();
866
867 ObjectValue* sv = sv_for_node_id(objs, spobj->_idx);
868 if (sv == NULL) {
869 ciKlass* cik = t->is_oopptr()->klass();
870 assert(cik->is_instance_klass() ||
871 cik->is_array_klass(), "Not supported allocation.");
872 uint first_ind = spobj->first_index(sfpt->jvms());
873 // Nullable, scalarized inline types have an is_init input
874 // that needs to be checked before using the field values.
875 ScopeValue* is_init = NULL;
876 if (cik->is_inlinetype()) {
877 Node* init_node = sfpt->in(first_ind++);
878 assert(init_node != NULL, "is_init node not found");
879 if (!init_node->is_top()) {
880 const TypeInt* init_type = init_node->bottom_type()->is_int();
881 if (init_node->is_Con()) {
882 is_init = new ConstantIntValue(init_type->get_con());
883 } else {
884 OptoReg::Name init_reg = C->regalloc()->get_reg_first(init_node);
885 is_init = new_loc_value(C->regalloc(), init_reg, Location::normal);
886 }
887 }
888 }
889 ScopeValue* klass_sv = new ConstantOopWriteValue(cik->java_mirror()->constant_encoding());
890 sv = spobj->is_auto_box() ? new AutoBoxObjectValue(spobj->_idx, klass_sv)
891 : new ObjectValue(spobj->_idx, klass_sv, is_init);
892 set_sv_for_object_node(objs, sv);
893
894 for (uint i = 0; i < spobj->n_fields(); i++) {
895 Node* fld_node = sfpt->in(first_ind+i);
896 (void)FillLocArray(sv->field_values()->length(), sfpt, fld_node, sv->field_values(), objs);
897 }
898 }
899 array->append(sv);
900 return;
901 }
902
903 // Grab the register number for the local
904 OptoReg::Name regnum = C->regalloc()->get_reg_first(local);
905 if( OptoReg::is_valid(regnum) ) {// Got a register/stack?
906 // Record the double as two float registers.
907 // The register mask for such a value always specifies two adjacent
908 // float registers, with the lower register number even.
909 // Normally, the allocation of high and low words to these registers
910 // is irrelevant, because nearly all operations on register pairs
911 // (e.g., StoreD) treat them as a single unit.
912 // Here, we assume in addition that the words in these two registers
913 // stored "naturally" (by operations like StoreD and double stores
914 // within the interpreter) such that the lower-numbered register
915 // is written to the lower memory address. This may seem like
916 // a machine dependency, but it is not--it is a requirement on
917 // the author of the <arch>.ad file to ensure that, for every
918 // even/odd double-register pair to which a double may be allocated,
919 // the word in the even single-register is stored to the first
920 // memory word. (Note that register numbers are completely
921 // arbitrary, and are not tied to any machine-level encodings.)
922 #ifdef _LP64
923 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon ) {
924 array->append(new ConstantIntValue((jint)0));
925 array->append(new_loc_value( C->regalloc(), regnum, Location::dbl ));
926 } else if ( t->base() == Type::Long ) {
927 array->append(new ConstantIntValue((jint)0));
928 array->append(new_loc_value( C->regalloc(), regnum, Location::lng ));
929 } else if ( t->base() == Type::RawPtr ) {
930 // jsr/ret return address which must be restored into a the full
931 // width 64-bit stack slot.
932 array->append(new_loc_value( C->regalloc(), regnum, Location::lng ));
933 }
934 #else //_LP64
935 if( t->base() == Type::DoubleBot || t->base() == Type::DoubleCon || t->base() == Type::Long ) {
936 // Repack the double/long as two jints.
937 // The convention the interpreter uses is that the second local
938 // holds the first raw word of the native double representation.
939 // This is actually reasonable, since locals and stack arrays
940 // grow downwards in all implementations.
941 // (If, on some machine, the interpreter's Java locals or stack
942 // were to grow upwards, the embedded doubles would be word-swapped.)
943 array->append(new_loc_value( C->regalloc(), OptoReg::add(regnum,1), Location::normal ));
944 array->append(new_loc_value( C->regalloc(), regnum , Location::normal ));
945 }
946 #endif //_LP64
947 else if( (t->base() == Type::FloatBot || t->base() == Type::FloatCon) &&
948 OptoReg::is_reg(regnum) ) {
949 array->append(new_loc_value( C->regalloc(), regnum, Matcher::float_in_double()
950 ? Location::float_in_dbl : Location::normal ));
951 } else if( t->base() == Type::Int && OptoReg::is_reg(regnum) ) {
952 array->append(new_loc_value( C->regalloc(), regnum, Matcher::int_in_long
953 ? Location::int_in_long : Location::normal ));
954 } else if( t->base() == Type::NarrowOop ) {
955 array->append(new_loc_value( C->regalloc(), regnum, Location::narrowoop ));
956 } else if (t->base() == Type::VectorA || t->base() == Type::VectorS ||
957 t->base() == Type::VectorD || t->base() == Type::VectorX ||
958 t->base() == Type::VectorY || t->base() == Type::VectorZ) {
959 array->append(new_loc_value( C->regalloc(), regnum, Location::vector ));
960 } else {
961 array->append(new_loc_value( C->regalloc(), regnum, C->regalloc()->is_oop(local) ? Location::oop : Location::normal ));
962 }
963 return;
964 }
965
966 // No register. It must be constant data.
967 switch (t->base()) {
968 case Type::Half: // Second half of a double
969 ShouldNotReachHere(); // Caller should skip 2nd halves
970 break;
971 case Type::AnyPtr:
972 array->append(new ConstantOopWriteValue(NULL));
973 break;
974 case Type::AryPtr:
975 case Type::InstPtr: // fall through
976 array->append(new ConstantOopWriteValue(t->isa_oopptr()->const_oop()->constant_encoding()));
977 break;
978 case Type::NarrowOop:
979 if (t == TypeNarrowOop::NULL_PTR) {
980 array->append(new ConstantOopWriteValue(NULL));
981 } else {
982 array->append(new ConstantOopWriteValue(t->make_ptr()->isa_oopptr()->const_oop()->constant_encoding()));
983 }
984 break;
985 case Type::Int:
986 array->append(new ConstantIntValue(t->is_int()->get_con()));
987 break;
988 case Type::RawPtr:
989 // A return address (T_ADDRESS).
990 assert((intptr_t)t->is_ptr()->get_con() < (intptr_t)0x10000, "must be a valid BCI");
991 #ifdef _LP64
992 // Must be restored to the full-width 64-bit stack slot.
993 array->append(new ConstantLongValue(t->is_ptr()->get_con()));
994 #else
995 array->append(new ConstantIntValue(t->is_ptr()->get_con()));
996 #endif
997 break;
998 case Type::FloatCon: {
999 float f = t->is_float_constant()->getf();
1000 array->append(new ConstantIntValue(jint_cast(f)));
1001 break;
1002 }
1003 case Type::DoubleCon: {
1004 jdouble d = t->is_double_constant()->getd();
1005 #ifdef _LP64
1006 array->append(new ConstantIntValue((jint)0));
1007 array->append(new ConstantDoubleValue(d));
1008 #else
1009 // Repack the double as two jints.
1010 // The convention the interpreter uses is that the second local
1011 // holds the first raw word of the native double representation.
1012 // This is actually reasonable, since locals and stack arrays
1013 // grow downwards in all implementations.
1014 // (If, on some machine, the interpreter's Java locals or stack
1015 // were to grow upwards, the embedded doubles would be word-swapped.)
1016 jlong_accessor acc;
1017 acc.long_value = jlong_cast(d);
1018 array->append(new ConstantIntValue(acc.words[1]));
1019 array->append(new ConstantIntValue(acc.words[0]));
1020 #endif
1021 break;
1022 }
1023 case Type::Long: {
1024 jlong d = t->is_long()->get_con();
1025 #ifdef _LP64
1026 array->append(new ConstantIntValue((jint)0));
1027 array->append(new ConstantLongValue(d));
1028 #else
1029 // Repack the long as two jints.
1030 // The convention the interpreter uses is that the second local
1031 // holds the first raw word of the native double representation.
1032 // This is actually reasonable, since locals and stack arrays
1033 // grow downwards in all implementations.
1034 // (If, on some machine, the interpreter's Java locals or stack
1035 // were to grow upwards, the embedded doubles would be word-swapped.)
1036 jlong_accessor acc;
1037 acc.long_value = d;
1038 array->append(new ConstantIntValue(acc.words[1]));
1039 array->append(new ConstantIntValue(acc.words[0]));
1040 #endif
1041 break;
1042 }
1043 case Type::Top: // Add an illegal value here
1044 array->append(new LocationValue(Location()));
1045 break;
1046 default:
1047 ShouldNotReachHere();
1048 break;
1049 }
1050 }
1051
1052 // Determine if this node starts a bundle
1053 bool PhaseOutput::starts_bundle(const Node *n) const {
1054 return (_node_bundling_limit > n->_idx &&
1055 _node_bundling_base[n->_idx].starts_bundle());
1056 }
1057
1058 //--------------------------Process_OopMap_Node--------------------------------
1059 void PhaseOutput::Process_OopMap_Node(MachNode *mach, int current_offset) {
1060 // Handle special safepoint nodes for synchronization
1061 MachSafePointNode *sfn = mach->as_MachSafePoint();
1062 MachCallNode *mcall;
1063
1064 int safepoint_pc_offset = current_offset;
1065 bool is_method_handle_invoke = false;
1066 bool is_opt_native = false;
1067 bool return_oop = false;
1068 bool return_scalarized = false;
1069 bool has_ea_local_in_scope = sfn->_has_ea_local_in_scope;
1070 bool arg_escape = false;
1071
1072 // Add the safepoint in the DebugInfoRecorder
1073 if( !mach->is_MachCall() ) {
1074 mcall = NULL;
1075 C->debug_info()->add_safepoint(safepoint_pc_offset, sfn->_oop_map);
1076 } else {
1077 mcall = mach->as_MachCall();
1078
1079 // Is the call a MethodHandle call?
1080 if (mcall->is_MachCallJava()) {
1081 if (mcall->as_MachCallJava()->_method_handle_invoke) {
1082 assert(C->has_method_handle_invokes(), "must have been set during call generation");
1083 is_method_handle_invoke = true;
1084 }
1085 arg_escape = mcall->as_MachCallJava()->_arg_escape;
1086 } else if (mcall->is_MachCallNative()) {
1087 is_opt_native = true;
1088 }
1089
1090 // Check if a call returns an object.
1091 if (mcall->returns_pointer() || mcall->returns_scalarized()) {
1092 return_oop = true;
1093 }
1094 if (mcall->returns_scalarized()) {
1095 return_scalarized = true;
1096 }
1097 safepoint_pc_offset += mcall->ret_addr_offset();
1098 C->debug_info()->add_safepoint(safepoint_pc_offset, mcall->_oop_map);
1099 }
1100
1101 // Loop over the JVMState list to add scope information
1102 // Do not skip safepoints with a NULL method, they need monitor info
1103 JVMState* youngest_jvms = sfn->jvms();
1104 int max_depth = youngest_jvms->depth();
1105
1106 // Allocate the object pool for scalar-replaced objects -- the map from
1107 // small-integer keys (which can be recorded in the local and ostack
1108 // arrays) to descriptions of the object state.
1109 GrowableArray<ScopeValue*> *objs = new GrowableArray<ScopeValue*>();
1110
1111 // Visit scopes from oldest to youngest.
1112 for (int depth = 1; depth <= max_depth; depth++) {
1113 JVMState* jvms = youngest_jvms->of_depth(depth);
1114 int idx;
1115 ciMethod* method = jvms->has_method() ? jvms->method() : NULL;
1116 // Safepoints that do not have method() set only provide oop-map and monitor info
1117 // to support GC; these do not support deoptimization.
1118 int num_locs = (method == NULL) ? 0 : jvms->loc_size();
1119 int num_exps = (method == NULL) ? 0 : jvms->stk_size();
1120 int num_mon = jvms->nof_monitors();
1121 assert(method == NULL || jvms->bci() < 0 || num_locs == method->max_locals(),
1122 "JVMS local count must match that of the method");
1123
1124 // Add Local and Expression Stack Information
1125
1126 // Insert locals into the locarray
1127 GrowableArray<ScopeValue*> *locarray = new GrowableArray<ScopeValue*>(num_locs);
1128 for( idx = 0; idx < num_locs; idx++ ) {
1129 FillLocArray( idx, sfn, sfn->local(jvms, idx), locarray, objs );
1130 }
1131
1132 // Insert expression stack entries into the exparray
1133 GrowableArray<ScopeValue*> *exparray = new GrowableArray<ScopeValue*>(num_exps);
1134 for( idx = 0; idx < num_exps; idx++ ) {
1135 FillLocArray( idx, sfn, sfn->stack(jvms, idx), exparray, objs );
1136 }
1137
1138 // Add in mappings of the monitors
1139 assert( !method ||
1140 !method->is_synchronized() ||
1141 method->is_native() ||
1142 num_mon > 0 ||
1143 !GenerateSynchronizationCode,
1144 "monitors must always exist for synchronized methods");
1145
1146 // Build the growable array of ScopeValues for exp stack
1147 GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);
1148
1149 // Loop over monitors and insert into array
1150 for (idx = 0; idx < num_mon; idx++) {
1151 // Grab the node that defines this monitor
1152 Node* box_node = sfn->monitor_box(jvms, idx);
1153 Node* obj_node = sfn->monitor_obj(jvms, idx);
1154
1155 // Create ScopeValue for object
1156 ScopeValue *scval = NULL;
1157
1158 if (obj_node->is_SafePointScalarObject()) {
1159 SafePointScalarObjectNode* spobj = obj_node->as_SafePointScalarObject();
1160 scval = PhaseOutput::sv_for_node_id(objs, spobj->_idx);
1161 if (scval == NULL) {
1162 const Type *t = spobj->bottom_type();
1163 ciKlass* cik = t->is_oopptr()->klass();
1164 assert(cik->is_instance_klass() ||
1165 cik->is_array_klass(), "Not supported allocation.");
1166 ScopeValue* klass_sv = new ConstantOopWriteValue(cik->java_mirror()->constant_encoding());
1167 ObjectValue* sv = spobj->is_auto_box() ? new AutoBoxObjectValue(spobj->_idx, klass_sv)
1168 : new ObjectValue(spobj->_idx, klass_sv);
1169 PhaseOutput::set_sv_for_object_node(objs, sv);
1170
1171 uint first_ind = spobj->first_index(youngest_jvms);
1172 for (uint i = 0; i < spobj->n_fields(); i++) {
1173 Node* fld_node = sfn->in(first_ind+i);
1174 (void)FillLocArray(sv->field_values()->length(), sfn, fld_node, sv->field_values(), objs);
1175 }
1176 scval = sv;
1177 }
1178 } else if (!obj_node->is_Con()) {
1179 OptoReg::Name obj_reg = C->regalloc()->get_reg_first(obj_node);
1180 if( obj_node->bottom_type()->base() == Type::NarrowOop ) {
1181 scval = new_loc_value( C->regalloc(), obj_reg, Location::narrowoop );
1182 } else {
1183 scval = new_loc_value( C->regalloc(), obj_reg, Location::oop );
1184 }
1185 } else {
1186 const TypePtr *tp = obj_node->get_ptr_type();
1187 scval = new ConstantOopWriteValue(tp->is_oopptr()->const_oop()->constant_encoding());
1188 }
1189
1190 OptoReg::Name box_reg = BoxLockNode::reg(box_node);
1191 Location basic_lock = Location::new_stk_loc(Location::normal,C->regalloc()->reg2offset(box_reg));
1192 bool eliminated = (box_node->is_BoxLock() && box_node->as_BoxLock()->is_eliminated());
1193 monarray->append(new MonitorValue(scval, basic_lock, eliminated));
1194 }
1195
1196 // We dump the object pool first, since deoptimization reads it in first.
1197 C->debug_info()->dump_object_pool(objs);
1198
1199 // Build first class objects to pass to scope
1200 DebugToken *locvals = C->debug_info()->create_scope_values(locarray);
1201 DebugToken *expvals = C->debug_info()->create_scope_values(exparray);
1202 DebugToken *monvals = C->debug_info()->create_monitor_values(monarray);
1203
1204 // Make method available for all Safepoints
1205 ciMethod* scope_method = method ? method : C->method();
1206 // Describe the scope here
1207 assert(jvms->bci() >= InvocationEntryBci && jvms->bci() <= 0x10000, "must be a valid or entry BCI");
1208 assert(!jvms->should_reexecute() || depth == max_depth, "reexecute allowed only for the youngest");
1209 // Now we can describe the scope.
1210 methodHandle null_mh;
1211 bool rethrow_exception = false;
1212 C->debug_info()->describe_scope(
1213 safepoint_pc_offset,
1214 null_mh,
1215 scope_method,
1216 jvms->bci(),
1217 jvms->should_reexecute(),
1218 rethrow_exception,
1219 is_method_handle_invoke,
1220 is_opt_native,
1221 return_oop,
1222 return_scalarized,
1223 has_ea_local_in_scope,
1224 arg_escape,
1225 locvals,
1226 expvals,
1227 monvals
1228 );
1229 } // End jvms loop
1230
1231 // Mark the end of the scope set.
1232 C->debug_info()->end_safepoint(safepoint_pc_offset);
1233 }
1234
1235
1236
1237 // A simplified version of Process_OopMap_Node, to handle non-safepoints.
1238 class NonSafepointEmitter {
1239 Compile* C;
1240 JVMState* _pending_jvms;
1241 int _pending_offset;
1242
1243 void emit_non_safepoint();
1244
1245 public:
1246 NonSafepointEmitter(Compile* compile) {
1247 this->C = compile;
1248 _pending_jvms = NULL;
1249 _pending_offset = 0;
1250 }
1251
1252 void observe_instruction(Node* n, int pc_offset) {
1253 if (!C->debug_info()->recording_non_safepoints()) return;
1254
1255 Node_Notes* nn = C->node_notes_at(n->_idx);
1256 if (nn == NULL || nn->jvms() == NULL) return;
1257 if (_pending_jvms != NULL &&
1258 _pending_jvms->same_calls_as(nn->jvms())) {
1259 // Repeated JVMS? Stretch it up here.
1260 _pending_offset = pc_offset;
1261 } else {
1262 if (_pending_jvms != NULL &&
1263 _pending_offset < pc_offset) {
1264 emit_non_safepoint();
1265 }
1266 _pending_jvms = NULL;
1267 if (pc_offset > C->debug_info()->last_pc_offset()) {
1268 // This is the only way _pending_jvms can become non-NULL:
1269 _pending_jvms = nn->jvms();
1270 _pending_offset = pc_offset;
1271 }
1272 }
1273 }
1274
1275 // Stay out of the way of real safepoints:
1276 void observe_safepoint(JVMState* jvms, int pc_offset) {
1277 if (_pending_jvms != NULL &&
1278 !_pending_jvms->same_calls_as(jvms) &&
1279 _pending_offset < pc_offset) {
1280 emit_non_safepoint();
1281 }
1282 _pending_jvms = NULL;
1283 }
1284
1285 void flush_at_end() {
1286 if (_pending_jvms != NULL) {
1287 emit_non_safepoint();
1288 }
1289 _pending_jvms = NULL;
1290 }
1291 };
1292
1293 void NonSafepointEmitter::emit_non_safepoint() {
1294 JVMState* youngest_jvms = _pending_jvms;
1295 int pc_offset = _pending_offset;
1296
1297 // Clear it now:
1298 _pending_jvms = NULL;
1299
1300 DebugInformationRecorder* debug_info = C->debug_info();
1301 assert(debug_info->recording_non_safepoints(), "sanity");
1302
1303 debug_info->add_non_safepoint(pc_offset);
1304 int max_depth = youngest_jvms->depth();
1305
1306 // Visit scopes from oldest to youngest.
1307 for (int depth = 1; depth <= max_depth; depth++) {
1308 JVMState* jvms = youngest_jvms->of_depth(depth);
1309 ciMethod* method = jvms->has_method() ? jvms->method() : NULL;
1310 assert(!jvms->should_reexecute() || depth==max_depth, "reexecute allowed only for the youngest");
1311 methodHandle null_mh;
1312 debug_info->describe_scope(pc_offset, null_mh, method, jvms->bci(), jvms->should_reexecute());
1313 }
1314
1315 // Mark the end of the scope set.
1316 debug_info->end_non_safepoint(pc_offset);
1317 }
1318
1319 //------------------------------init_buffer------------------------------------
1320 void PhaseOutput::estimate_buffer_size(int& const_req) {
1321
1322 // Set the initially allocated size
1323 const_req = initial_const_capacity;
1324
1325 // The extra spacing after the code is necessary on some platforms.
1326 // Sometimes we need to patch in a jump after the last instruction,
1327 // if the nmethod has been deoptimized. (See 4932387, 4894843.)
1328
1329 // Compute the byte offset where we can store the deopt pc.
1330 if (C->fixed_slots() != 0) {
1331 _orig_pc_slot_offset_in_bytes = C->regalloc()->reg2offset(OptoReg::stack2reg(_orig_pc_slot));
1332 }
1333
1334 // Compute prolog code size
1335 _method_size = 0;
1336 _frame_slots = OptoReg::reg2stack(C->matcher()->_old_SP) + C->regalloc()->_framesize;
1337 assert(_frame_slots >= 0 && _frame_slots < 1000000, "sanity check");
1338
1339 if (C->has_mach_constant_base_node()) {
1340 uint add_size = 0;
1341 // Fill the constant table.
1342 // Note: This must happen before shorten_branches.
1343 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1344 Block* b = C->cfg()->get_block(i);
1345
1346 for (uint j = 0; j < b->number_of_nodes(); j++) {
1347 Node* n = b->get_node(j);
1348
1349 // If the node is a MachConstantNode evaluate the constant
1350 // value section.
1351 if (n->is_MachConstant()) {
1352 MachConstantNode* machcon = n->as_MachConstant();
1353 machcon->eval_constant(C);
1354 } else if (n->is_Mach()) {
1355 // On Power there are more nodes that issue constants.
1356 add_size += (n->as_Mach()->ins_num_consts() * 8);
1357 }
1358 }
1359 }
1360
1361 // Calculate the offsets of the constants and the size of the
1362 // constant table (including the padding to the next section).
1363 constant_table().calculate_offsets_and_size();
1364 const_req = constant_table().size() + add_size;
1365 }
1366
1367 // Initialize the space for the BufferBlob used to find and verify
1368 // instruction size in MachNode::emit_size()
1369 init_scratch_buffer_blob(const_req);
1370 }
1371
1372 CodeBuffer* PhaseOutput::init_buffer() {
1373 int stub_req = _buf_sizes._stub;
1374 int code_req = _buf_sizes._code;
1375 int const_req = _buf_sizes._const;
1376
1377 int pad_req = NativeCall::instruction_size;
1378
1379 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1380 stub_req += bs->estimate_stub_size();
1381 stub_req += safepoint_poll_table()->estimate_stub_size();
1382
1383 // nmethod and CodeBuffer count stubs & constants as part of method's code.
1384 // class HandlerImpl is platform-specific and defined in the *.ad files.
1385 int exception_handler_req = HandlerImpl::size_exception_handler() + MAX_stubs_size; // add marginal slop for handler
1386 int deopt_handler_req = HandlerImpl::size_deopt_handler() + MAX_stubs_size; // add marginal slop for handler
1387 stub_req += MAX_stubs_size; // ensure per-stub margin
1388 code_req += MAX_inst_size; // ensure per-instruction margin
1389
1390 if (StressCodeBuffers)
1391 code_req = const_req = stub_req = exception_handler_req = deopt_handler_req = 0x10; // force expansion
1392
1393 int total_req =
1394 const_req +
1395 code_req +
1396 pad_req +
1397 stub_req +
1398 exception_handler_req +
1399 deopt_handler_req; // deopt handler
1400
1401 if (C->has_method_handle_invokes())
1402 total_req += deopt_handler_req; // deopt MH handler
1403
1404 CodeBuffer* cb = code_buffer();
1405 cb->initialize(total_req, _buf_sizes._reloc);
1406
1407 // Have we run out of code space?
1408 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
1409 C->record_failure("CodeCache is full");
1410 return NULL;
1411 }
1412 // Configure the code buffer.
1413 cb->initialize_consts_size(const_req);
1414 cb->initialize_stubs_size(stub_req);
1415 cb->initialize_oop_recorder(C->env()->oop_recorder());
1416
1417 // fill in the nop array for bundling computations
1418 MachNode *_nop_list[Bundle::_nop_count];
1419 Bundle::initialize_nops(_nop_list);
1420
1421 return cb;
1422 }
1423
1424 //------------------------------fill_buffer------------------------------------
1425 void PhaseOutput::fill_buffer(CodeBuffer* cb, uint* blk_starts) {
1426 // blk_starts[] contains offsets calculated during short branches processing,
1427 // offsets should not be increased during following steps.
1428
1429 // Compute the size of first NumberOfLoopInstrToAlign instructions at head
1430 // of a loop. It is used to determine the padding for loop alignment.
1431 Compile::TracePhase tp("fill buffer", &timers[_t_fillBuffer]);
1432
1433 compute_loop_first_inst_sizes();
1434
1435 // Create oopmap set.
1436 _oop_map_set = new OopMapSet();
1437
1438 // !!!!! This preserves old handling of oopmaps for now
1439 C->debug_info()->set_oopmaps(_oop_map_set);
1440
1441 uint nblocks = C->cfg()->number_of_blocks();
1442 // Count and start of implicit null check instructions
1443 uint inct_cnt = 0;
1444 uint* inct_starts = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1445
1446 // Count and start of calls
1447 uint* call_returns = NEW_RESOURCE_ARRAY(uint, nblocks+1);
1448
1449 uint return_offset = 0;
1450 int nop_size = (new MachNopNode())->size(C->regalloc());
1451
1452 int previous_offset = 0;
1453 int current_offset = 0;
1454 int last_call_offset = -1;
1455 int last_avoid_back_to_back_offset = -1;
1456 #ifdef ASSERT
1457 uint* jmp_target = NEW_RESOURCE_ARRAY(uint,nblocks);
1458 uint* jmp_offset = NEW_RESOURCE_ARRAY(uint,nblocks);
1459 uint* jmp_size = NEW_RESOURCE_ARRAY(uint,nblocks);
1460 uint* jmp_rule = NEW_RESOURCE_ARRAY(uint,nblocks);
1461 #endif
1462
1463 // Create an array of unused labels, one for each basic block, if printing is enabled
1464 #if defined(SUPPORT_OPTO_ASSEMBLY)
1465 int* node_offsets = NULL;
1466 uint node_offset_limit = C->unique();
1467
1468 if (C->print_assembly()) {
1469 node_offsets = NEW_RESOURCE_ARRAY(int, node_offset_limit);
1470 }
1471 if (node_offsets != NULL) {
1472 // We need to initialize. Unused array elements may contain garbage and mess up PrintOptoAssembly.
1473 memset(node_offsets, 0, node_offset_limit*sizeof(int));
1474 }
1475 #endif
1476
1477 NonSafepointEmitter non_safepoints(C); // emit non-safepoints lazily
1478
1479 // Emit the constant table.
1480 if (C->has_mach_constant_base_node()) {
1481 if (!constant_table().emit(*cb)) {
1482 C->record_failure("consts section overflow");
1483 return;
1484 }
1485 }
1486
1487 // Create an array of labels, one for each basic block
1488 Label* blk_labels = NEW_RESOURCE_ARRAY(Label, nblocks+1);
1489 for (uint i = 0; i <= nblocks; i++) {
1490 blk_labels[i].init();
1491 }
1492
1493 // Now fill in the code buffer
1494 Node* delay_slot = NULL;
1495 for (uint i = 0; i < nblocks; i++) {
1496 Block* block = C->cfg()->get_block(i);
1497 _block = block;
1498 Node* head = block->head();
1499
1500 // If this block needs to start aligned (i.e, can be reached other
1501 // than by falling-thru from the previous block), then force the
1502 // start of a new bundle.
1503 if (Pipeline::requires_bundling() && starts_bundle(head)) {
1504 cb->flush_bundle(true);
1505 }
1506
1507 #ifdef ASSERT
1508 if (!block->is_connector()) {
1509 stringStream st;
1510 block->dump_head(C->cfg(), &st);
1511 MacroAssembler(cb).block_comment(st.as_string());
1512 }
1513 jmp_target[i] = 0;
1514 jmp_offset[i] = 0;
1515 jmp_size[i] = 0;
1516 jmp_rule[i] = 0;
1517 #endif
1518 int blk_offset = current_offset;
1519
1520 // Define the label at the beginning of the basic block
1521 MacroAssembler(cb).bind(blk_labels[block->_pre_order]);
1522
1523 uint last_inst = block->number_of_nodes();
1524
1525 // Emit block normally, except for last instruction.
1526 // Emit means "dump code bits into code buffer".
1527 for (uint j = 0; j<last_inst; j++) {
1528 _index = j;
1529
1530 // Get the node
1531 Node* n = block->get_node(j);
1532
1533 // See if delay slots are supported
1534 if (valid_bundle_info(n) && node_bundling(n)->used_in_unconditional_delay()) {
1535 assert(delay_slot == NULL, "no use of delay slot node");
1536 assert(n->size(C->regalloc()) == Pipeline::instr_unit_size(), "delay slot instruction wrong size");
1537
1538 delay_slot = n;
1539 continue;
1540 }
1541
1542 // If this starts a new instruction group, then flush the current one
1543 // (but allow split bundles)
1544 if (Pipeline::requires_bundling() && starts_bundle(n))
1545 cb->flush_bundle(false);
1546
1547 // Special handling for SafePoint/Call Nodes
1548 bool is_mcall = false;
1549 if (n->is_Mach()) {
1550 MachNode *mach = n->as_Mach();
1551 is_mcall = n->is_MachCall();
1552 bool is_sfn = n->is_MachSafePoint();
1553
1554 // If this requires all previous instructions be flushed, then do so
1555 if (is_sfn || is_mcall || mach->alignment_required() != 1) {
1556 cb->flush_bundle(true);
1557 current_offset = cb->insts_size();
1558 }
1559
1560 // A padding may be needed again since a previous instruction
1561 // could be moved to delay slot.
1562
1563 // align the instruction if necessary
1564 int padding = mach->compute_padding(current_offset);
1565 // Make sure safepoint node for polling is distinct from a call's
1566 // return by adding a nop if needed.
1567 if (is_sfn && !is_mcall && padding == 0 && current_offset == last_call_offset) {
1568 padding = nop_size;
1569 }
1570 if (padding == 0 && mach->avoid_back_to_back(MachNode::AVOID_BEFORE) &&
1571 current_offset == last_avoid_back_to_back_offset) {
1572 // Avoid back to back some instructions.
1573 padding = nop_size;
1574 }
1575
1576 if (padding > 0) {
1577 assert((padding % nop_size) == 0, "padding is not a multiple of NOP size");
1578 int nops_cnt = padding / nop_size;
1579 MachNode *nop = new MachNopNode(nops_cnt);
1580 block->insert_node(nop, j++);
1581 last_inst++;
1582 C->cfg()->map_node_to_block(nop, block);
1583 // Ensure enough space.
1584 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
1585 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
1586 C->record_failure("CodeCache is full");
1587 return;
1588 }
1589 nop->emit(*cb, C->regalloc());
1590 cb->flush_bundle(true);
1591 current_offset = cb->insts_size();
1592 }
1593
1594 bool observe_safepoint = is_sfn;
1595 // Remember the start of the last call in a basic block
1596 if (is_mcall) {
1597 MachCallNode *mcall = mach->as_MachCall();
1598
1599 if (mcall->entry_point() != NULL) {
1600 // This destination address is NOT PC-relative
1601 mcall->method_set((intptr_t)mcall->entry_point());
1602 }
1603
1604 // Save the return address
1605 call_returns[block->_pre_order] = current_offset + mcall->ret_addr_offset();
1606
1607 observe_safepoint = mcall->guaranteed_safepoint();
1608 }
1609
1610 // sfn will be valid whenever mcall is valid now because of inheritance
1611 if (observe_safepoint) {
1612 // Handle special safepoint nodes for synchronization
1613 if (!is_mcall) {
1614 MachSafePointNode *sfn = mach->as_MachSafePoint();
1615 // !!!!! Stubs only need an oopmap right now, so bail out
1616 if (sfn->jvms()->method() == NULL) {
1617 // Write the oopmap directly to the code blob??!!
1618 continue;
1619 }
1620 } // End synchronization
1621
1622 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1623 current_offset);
1624 Process_OopMap_Node(mach, current_offset);
1625 } // End if safepoint
1626
1627 // If this is a null check, then add the start of the previous instruction to the list
1628 else if( mach->is_MachNullCheck() ) {
1629 inct_starts[inct_cnt++] = previous_offset;
1630 }
1631
1632 // If this is a branch, then fill in the label with the target BB's label
1633 else if (mach->is_MachBranch()) {
1634 // This requires the TRUE branch target be in succs[0]
1635 uint block_num = block->non_connector_successor(0)->_pre_order;
1636
1637 // Try to replace long branch if delay slot is not used,
1638 // it is mostly for back branches since forward branch's
1639 // distance is not updated yet.
1640 bool delay_slot_is_used = valid_bundle_info(n) &&
1641 C->output()->node_bundling(n)->use_unconditional_delay();
1642 if (!delay_slot_is_used && mach->may_be_short_branch()) {
1643 assert(delay_slot == NULL, "not expecting delay slot node");
1644 int br_size = n->size(C->regalloc());
1645 int offset = blk_starts[block_num] - current_offset;
1646 if (block_num >= i) {
1647 // Current and following block's offset are not
1648 // finalized yet, adjust distance by the difference
1649 // between calculated and final offsets of current block.
1650 offset -= (blk_starts[i] - blk_offset);
1651 }
1652 // In the following code a nop could be inserted before
1653 // the branch which will increase the backward distance.
1654 bool needs_padding = (current_offset == last_avoid_back_to_back_offset);
1655 if (needs_padding && offset <= 0)
1656 offset -= nop_size;
1657
1658 if (C->matcher()->is_short_branch_offset(mach->rule(), br_size, offset)) {
1659 // We've got a winner. Replace this branch.
1660 MachNode* replacement = mach->as_MachBranch()->short_branch_version();
1661
1662 // Update the jmp_size.
1663 int new_size = replacement->size(C->regalloc());
1664 assert((br_size - new_size) >= (int)nop_size, "short_branch size should be smaller");
1665 // Insert padding between avoid_back_to_back branches.
1666 if (needs_padding && replacement->avoid_back_to_back(MachNode::AVOID_BEFORE)) {
1667 MachNode *nop = new MachNopNode();
1668 block->insert_node(nop, j++);
1669 C->cfg()->map_node_to_block(nop, block);
1670 last_inst++;
1671 nop->emit(*cb, C->regalloc());
1672 cb->flush_bundle(true);
1673 current_offset = cb->insts_size();
1674 }
1675 #ifdef ASSERT
1676 jmp_target[i] = block_num;
1677 jmp_offset[i] = current_offset - blk_offset;
1678 jmp_size[i] = new_size;
1679 jmp_rule[i] = mach->rule();
1680 #endif
1681 block->map_node(replacement, j);
1682 mach->subsume_by(replacement, C);
1683 n = replacement;
1684 mach = replacement;
1685 }
1686 }
1687 mach->as_MachBranch()->label_set( &blk_labels[block_num], block_num );
1688 } else if (mach->ideal_Opcode() == Op_Jump) {
1689 for (uint h = 0; h < block->_num_succs; h++) {
1690 Block* succs_block = block->_succs[h];
1691 for (uint j = 1; j < succs_block->num_preds(); j++) {
1692 Node* jpn = succs_block->pred(j);
1693 if (jpn->is_JumpProj() && jpn->in(0) == mach) {
1694 uint block_num = succs_block->non_connector()->_pre_order;
1695 Label *blkLabel = &blk_labels[block_num];
1696 mach->add_case_label(jpn->as_JumpProj()->proj_no(), blkLabel);
1697 }
1698 }
1699 }
1700 }
1701 #ifdef ASSERT
1702 // Check that oop-store precedes the card-mark
1703 else if (mach->ideal_Opcode() == Op_StoreCM) {
1704 uint storeCM_idx = j;
1705 int count = 0;
1706 for (uint prec = mach->req(); prec < mach->len(); prec++) {
1707 Node *oop_store = mach->in(prec); // Precedence edge
1708 if (oop_store == NULL) continue;
1709 count++;
1710 uint i4;
1711 for (i4 = 0; i4 < last_inst; ++i4) {
1712 if (block->get_node(i4) == oop_store) {
1713 break;
1714 }
1715 }
1716 // Note: This test can provide a false failure if other precedence
1717 // edges have been added to the storeCMNode.
1718 assert(i4 == last_inst || i4 < storeCM_idx, "CM card-mark executes before oop-store");
1719 }
1720 assert(count > 0, "storeCM expects at least one precedence edge");
1721 }
1722 #endif
1723 else if (!n->is_Proj()) {
1724 // Remember the beginning of the previous instruction, in case
1725 // it's followed by a flag-kill and a null-check. Happens on
1726 // Intel all the time, with add-to-memory kind of opcodes.
1727 previous_offset = current_offset;
1728 }
1729
1730 // Not an else-if!
1731 // If this is a trap based cmp then add its offset to the list.
1732 if (mach->is_TrapBasedCheckNode()) {
1733 inct_starts[inct_cnt++] = current_offset;
1734 }
1735 }
1736
1737 // Verify that there is sufficient space remaining
1738 cb->insts()->maybe_expand_to_ensure_remaining(MAX_inst_size);
1739 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
1740 C->record_failure("CodeCache is full");
1741 return;
1742 }
1743
1744 // Save the offset for the listing
1745 #if defined(SUPPORT_OPTO_ASSEMBLY)
1746 if ((node_offsets != NULL) && (n->_idx < node_offset_limit)) {
1747 node_offsets[n->_idx] = cb->insts_size();
1748 }
1749 #endif
1750 assert(!C->failing(), "Should not reach here if failing.");
1751
1752 // "Normal" instruction case
1753 DEBUG_ONLY(uint instr_offset = cb->insts_size());
1754 n->emit(*cb, C->regalloc());
1755 current_offset = cb->insts_size();
1756
1757 // Above we only verified that there is enough space in the instruction section.
1758 // However, the instruction may emit stubs that cause code buffer expansion.
1759 // Bail out here if expansion failed due to a lack of code cache space.
1760 if (C->failing()) {
1761 return;
1762 }
1763
1764 assert(!is_mcall || (call_returns[block->_pre_order] <= (uint)current_offset),
1765 "ret_addr_offset() not within emitted code");
1766 #ifdef ASSERT
1767 uint n_size = n->size(C->regalloc());
1768 if (n_size < (current_offset-instr_offset)) {
1769 MachNode* mach = n->as_Mach();
1770 n->dump();
1771 mach->dump_format(C->regalloc(), tty);
1772 tty->print_cr(" n_size (%d), current_offset (%d), instr_offset (%d)", n_size, current_offset, instr_offset);
1773 Disassembler::decode(cb->insts_begin() + instr_offset, cb->insts_begin() + current_offset + 1, tty);
1774 tty->print_cr(" ------------------- ");
1775 BufferBlob* blob = this->scratch_buffer_blob();
1776 address blob_begin = blob->content_begin();
1777 Disassembler::decode(blob_begin, blob_begin + n_size + 1, tty);
1778 assert(false, "wrong size of mach node");
1779 }
1780 #endif
1781 non_safepoints.observe_instruction(n, current_offset);
1782
1783 // mcall is last "call" that can be a safepoint
1784 // record it so we can see if a poll will directly follow it
1785 // in which case we'll need a pad to make the PcDesc sites unique
1786 // see 5010568. This can be slightly inaccurate but conservative
1787 // in the case that return address is not actually at current_offset.
1788 // This is a small price to pay.
1789
1790 if (is_mcall) {
1791 last_call_offset = current_offset;
1792 }
1793
1794 if (n->is_Mach() && n->as_Mach()->avoid_back_to_back(MachNode::AVOID_AFTER)) {
1795 // Avoid back to back some instructions.
1796 last_avoid_back_to_back_offset = current_offset;
1797 }
1798
1799 // See if this instruction has a delay slot
1800 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
1801 guarantee(delay_slot != NULL, "expecting delay slot node");
1802
1803 // Back up 1 instruction
1804 cb->set_insts_end(cb->insts_end() - Pipeline::instr_unit_size());
1805
1806 // Save the offset for the listing
1807 #if defined(SUPPORT_OPTO_ASSEMBLY)
1808 if ((node_offsets != NULL) && (delay_slot->_idx < node_offset_limit)) {
1809 node_offsets[delay_slot->_idx] = cb->insts_size();
1810 }
1811 #endif
1812
1813 // Support a SafePoint in the delay slot
1814 if (delay_slot->is_MachSafePoint()) {
1815 MachNode *mach = delay_slot->as_Mach();
1816 // !!!!! Stubs only need an oopmap right now, so bail out
1817 if (!mach->is_MachCall() && mach->as_MachSafePoint()->jvms()->method() == NULL) {
1818 // Write the oopmap directly to the code blob??!!
1819 delay_slot = NULL;
1820 continue;
1821 }
1822
1823 int adjusted_offset = current_offset - Pipeline::instr_unit_size();
1824 non_safepoints.observe_safepoint(mach->as_MachSafePoint()->jvms(),
1825 adjusted_offset);
1826 // Generate an OopMap entry
1827 Process_OopMap_Node(mach, adjusted_offset);
1828 }
1829
1830 // Insert the delay slot instruction
1831 delay_slot->emit(*cb, C->regalloc());
1832
1833 // Don't reuse it
1834 delay_slot = NULL;
1835 }
1836
1837 } // End for all instructions in block
1838
1839 // If the next block is the top of a loop, pad this block out to align
1840 // the loop top a little. Helps prevent pipe stalls at loop back branches.
1841 if (i < nblocks-1) {
1842 Block *nb = C->cfg()->get_block(i + 1);
1843 int padding = nb->alignment_padding(current_offset);
1844 if( padding > 0 ) {
1845 MachNode *nop = new MachNopNode(padding / nop_size);
1846 block->insert_node(nop, block->number_of_nodes());
1847 C->cfg()->map_node_to_block(nop, block);
1848 nop->emit(*cb, C->regalloc());
1849 current_offset = cb->insts_size();
1850 }
1851 }
1852 // Verify that the distance for generated before forward
1853 // short branches is still valid.
1854 guarantee((int)(blk_starts[i+1] - blk_starts[i]) >= (current_offset - blk_offset), "shouldn't increase block size");
1855
1856 // Save new block start offset
1857 blk_starts[i] = blk_offset;
1858 } // End of for all blocks
1859 blk_starts[nblocks] = current_offset;
1860
1861 non_safepoints.flush_at_end();
1862
1863 // Offset too large?
1864 if (C->failing()) return;
1865
1866 // Define a pseudo-label at the end of the code
1867 MacroAssembler(cb).bind( blk_labels[nblocks] );
1868
1869 // Compute the size of the first block
1870 _first_block_size = blk_labels[1].loc_pos() - blk_labels[0].loc_pos();
1871
1872 #ifdef ASSERT
1873 for (uint i = 0; i < nblocks; i++) { // For all blocks
1874 if (jmp_target[i] != 0) {
1875 int br_size = jmp_size[i];
1876 int offset = blk_starts[jmp_target[i]]-(blk_starts[i] + jmp_offset[i]);
1877 if (!C->matcher()->is_short_branch_offset(jmp_rule[i], br_size, offset)) {
1878 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]);
1879 assert(false, "Displacement too large for short jmp");
1880 }
1881 }
1882 }
1883 #endif
1884
1885 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
1886 bs->emit_stubs(*cb);
1887 if (C->failing()) return;
1888
1889 // Fill in stubs for calling the runtime from safepoint polls.
1890 safepoint_poll_table()->emit(*cb);
1891 if (C->failing()) return;
1892
1893 #ifndef PRODUCT
1894 // Information on the size of the method, without the extraneous code
1895 Scheduling::increment_method_size(cb->insts_size());
1896 #endif
1897
1898 // ------------------
1899 // Fill in exception table entries.
1900 FillExceptionTables(inct_cnt, call_returns, inct_starts, blk_labels);
1901
1902 // Only java methods have exception handlers and deopt handlers
1903 // class HandlerImpl is platform-specific and defined in the *.ad files.
1904 if (C->method()) {
1905 // Emit the exception handler code.
1906 _code_offsets.set_value(CodeOffsets::Exceptions, HandlerImpl::emit_exception_handler(*cb));
1907 if (C->failing()) {
1908 return; // CodeBuffer::expand failed
1909 }
1910 // Emit the deopt handler code.
1911 _code_offsets.set_value(CodeOffsets::Deopt, HandlerImpl::emit_deopt_handler(*cb));
1912
1913 // Emit the MethodHandle deopt handler code (if required).
1914 if (C->has_method_handle_invokes() && !C->failing()) {
1915 // We can use the same code as for the normal deopt handler, we
1916 // just need a different entry point address.
1917 _code_offsets.set_value(CodeOffsets::DeoptMH, HandlerImpl::emit_deopt_handler(*cb));
1918 }
1919 }
1920
1921 // One last check for failed CodeBuffer::expand:
1922 if ((cb->blob() == NULL) || (!CompileBroker::should_compile_new_jobs())) {
1923 C->record_failure("CodeCache is full");
1924 return;
1925 }
1926
1927 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) || defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_OPTO_ASSEMBLY)
1928 if (C->print_assembly()) {
1929 tty->cr();
1930 tty->print_cr("============================= C2-compiled nmethod ==============================");
1931 }
1932 #endif
1933
1934 #if defined(SUPPORT_OPTO_ASSEMBLY)
1935 // Dump the assembly code, including basic-block numbers
1936 if (C->print_assembly()) {
1937 ttyLocker ttyl; // keep the following output all in one block
1938 if (!VMThread::should_terminate()) { // test this under the tty lock
1939 // This output goes directly to the tty, not the compiler log.
1940 // To enable tools to match it up with the compilation activity,
1941 // be sure to tag this tty output with the compile ID.
1942 if (xtty != NULL) {
1943 xtty->head("opto_assembly compile_id='%d'%s", C->compile_id(),
1944 C->is_osr_compilation() ? " compile_kind='osr'" : "");
1945 }
1946 if (C->method() != NULL) {
1947 tty->print_cr("----------------------- MetaData before Compile_id = %d ------------------------", C->compile_id());
1948 C->method()->print_metadata();
1949 } else if (C->stub_name() != NULL) {
1950 tty->print_cr("----------------------------- RuntimeStub %s -------------------------------", C->stub_name());
1951 }
1952 tty->cr();
1953 tty->print_cr("------------------------ OptoAssembly for Compile_id = %d -----------------------", C->compile_id());
1954 dump_asm(node_offsets, node_offset_limit);
1955 tty->print_cr("--------------------------------------------------------------------------------");
1956 if (xtty != NULL) {
1957 // print_metadata and dump_asm above may safepoint which makes us loose the ttylock.
1958 // Retake lock too make sure the end tag is coherent, and that xmlStream->pop_tag is done
1959 // thread safe
1960 ttyLocker ttyl2;
1961 xtty->tail("opto_assembly");
1962 }
1963 }
1964 }
1965 #endif
1966 }
1967
1968 void PhaseOutput::FillExceptionTables(uint cnt, uint *call_returns, uint *inct_starts, Label *blk_labels) {
1969 _inc_table.set_size(cnt);
1970
1971 uint inct_cnt = 0;
1972 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
1973 Block* block = C->cfg()->get_block(i);
1974 Node *n = NULL;
1975 int j;
1976
1977 // Find the branch; ignore trailing NOPs.
1978 for (j = block->number_of_nodes() - 1; j >= 0; j--) {
1979 n = block->get_node(j);
1980 if (!n->is_Mach() || n->as_Mach()->ideal_Opcode() != Op_Con) {
1981 break;
1982 }
1983 }
1984
1985 // If we didn't find anything, continue
1986 if (j < 0) {
1987 continue;
1988 }
1989
1990 // Compute ExceptionHandlerTable subtable entry and add it
1991 // (skip empty blocks)
1992 if (n->is_Catch()) {
1993
1994 // Get the offset of the return from the call
1995 uint call_return = call_returns[block->_pre_order];
1996 #ifdef ASSERT
1997 assert( call_return > 0, "no call seen for this basic block" );
1998 while (block->get_node(--j)->is_MachProj()) ;
1999 assert(block->get_node(j)->is_MachCall(), "CatchProj must follow call");
2000 #endif
2001 // last instruction is a CatchNode, find it's CatchProjNodes
2002 int nof_succs = block->_num_succs;
2003 // allocate space
2004 GrowableArray<intptr_t> handler_bcis(nof_succs);
2005 GrowableArray<intptr_t> handler_pcos(nof_succs);
2006 // iterate through all successors
2007 for (int j = 0; j < nof_succs; j++) {
2008 Block* s = block->_succs[j];
2009 bool found_p = false;
2010 for (uint k = 1; k < s->num_preds(); k++) {
2011 Node* pk = s->pred(k);
2012 if (pk->is_CatchProj() && pk->in(0) == n) {
2013 const CatchProjNode* p = pk->as_CatchProj();
2014 found_p = true;
2015 // add the corresponding handler bci & pco information
2016 if (p->_con != CatchProjNode::fall_through_index) {
2017 // p leads to an exception handler (and is not fall through)
2018 assert(s == C->cfg()->get_block(s->_pre_order), "bad numbering");
2019 // no duplicates, please
2020 if (!handler_bcis.contains(p->handler_bci())) {
2021 uint block_num = s->non_connector()->_pre_order;
2022 handler_bcis.append(p->handler_bci());
2023 handler_pcos.append(blk_labels[block_num].loc_pos());
2024 }
2025 }
2026 }
2027 }
2028 assert(found_p, "no matching predecessor found");
2029 // Note: Due to empty block removal, one block may have
2030 // several CatchProj inputs, from the same Catch.
2031 }
2032
2033 // Set the offset of the return from the call
2034 assert(handler_bcis.find(-1) != -1, "must have default handler");
2035 _handler_table.add_subtable(call_return, &handler_bcis, NULL, &handler_pcos);
2036 continue;
2037 }
2038
2039 // Handle implicit null exception table updates
2040 if (n->is_MachNullCheck()) {
2041 uint block_num = block->non_connector_successor(0)->_pre_order;
2042 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2043 continue;
2044 }
2045 // Handle implicit exception table updates: trap instructions.
2046 if (n->is_Mach() && n->as_Mach()->is_TrapBasedCheckNode()) {
2047 uint block_num = block->non_connector_successor(0)->_pre_order;
2048 _inc_table.append(inct_starts[inct_cnt++], blk_labels[block_num].loc_pos());
2049 continue;
2050 }
2051 } // End of for all blocks fill in exception table entries
2052 }
2053
2054 // Static Variables
2055 #ifndef PRODUCT
2056 uint Scheduling::_total_nop_size = 0;
2057 uint Scheduling::_total_method_size = 0;
2058 uint Scheduling::_total_branches = 0;
2059 uint Scheduling::_total_unconditional_delays = 0;
2060 uint Scheduling::_total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];
2061 #endif
2062
2063 // Initializer for class Scheduling
2064
2065 Scheduling::Scheduling(Arena *arena, Compile &compile)
2066 : _arena(arena),
2067 _cfg(compile.cfg()),
2068 _regalloc(compile.regalloc()),
2069 _scheduled(arena),
2070 _available(arena),
2071 _reg_node(arena),
2072 _pinch_free_list(arena),
2073 _next_node(NULL),
2074 _bundle_instr_count(0),
2075 _bundle_cycle_number(0),
2076 _bundle_use(0, 0, resource_count, &_bundle_use_elements[0])
2077 #ifndef PRODUCT
2078 , _branches(0)
2079 , _unconditional_delays(0)
2080 #endif
2081 {
2082 // Create a MachNopNode
2083 _nop = new MachNopNode();
2084
2085 // Now that the nops are in the array, save the count
2086 // (but allow entries for the nops)
2087 _node_bundling_limit = compile.unique();
2088 uint node_max = _regalloc->node_regs_max_index();
2089
2090 compile.output()->set_node_bundling_limit(_node_bundling_limit);
2091
2092 // This one is persistent within the Compile class
2093 _node_bundling_base = NEW_ARENA_ARRAY(compile.comp_arena(), Bundle, node_max);
2094
2095 // Allocate space for fixed-size arrays
2096 _node_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
2097 _uses = NEW_ARENA_ARRAY(arena, short, node_max);
2098 _current_latency = NEW_ARENA_ARRAY(arena, unsigned short, node_max);
2099
2100 // Clear the arrays
2101 for (uint i = 0; i < node_max; i++) {
2102 ::new (&_node_bundling_base[i]) Bundle();
2103 }
2104 memset(_node_latency, 0, node_max * sizeof(unsigned short));
2105 memset(_uses, 0, node_max * sizeof(short));
2106 memset(_current_latency, 0, node_max * sizeof(unsigned short));
2107
2108 // Clear the bundling information
2109 memcpy(_bundle_use_elements, Pipeline_Use::elaborated_elements, sizeof(Pipeline_Use::elaborated_elements));
2110
2111 // Get the last node
2112 Block* block = _cfg->get_block(_cfg->number_of_blocks() - 1);
2113
2114 _next_node = block->get_node(block->number_of_nodes() - 1);
2115 }
2116
2117 #ifndef PRODUCT
2118 // Scheduling destructor
2119 Scheduling::~Scheduling() {
2120 _total_branches += _branches;
2121 _total_unconditional_delays += _unconditional_delays;
2122 }
2123 #endif
2124
2125 // Step ahead "i" cycles
2126 void Scheduling::step(uint i) {
2127
2128 Bundle *bundle = node_bundling(_next_node);
2129 bundle->set_starts_bundle();
2130
2131 // Update the bundle record, but leave the flags information alone
2132 if (_bundle_instr_count > 0) {
2133 bundle->set_instr_count(_bundle_instr_count);
2134 bundle->set_resources_used(_bundle_use.resourcesUsed());
2135 }
2136
2137 // Update the state information
2138 _bundle_instr_count = 0;
2139 _bundle_cycle_number += i;
2140 _bundle_use.step(i);
2141 }
2142
2143 void Scheduling::step_and_clear() {
2144 Bundle *bundle = node_bundling(_next_node);
2145 bundle->set_starts_bundle();
2146
2147 // Update the bundle record
2148 if (_bundle_instr_count > 0) {
2149 bundle->set_instr_count(_bundle_instr_count);
2150 bundle->set_resources_used(_bundle_use.resourcesUsed());
2151
2152 _bundle_cycle_number += 1;
2153 }
2154
2155 // Clear the bundling information
2156 _bundle_instr_count = 0;
2157 _bundle_use.reset();
2158
2159 memcpy(_bundle_use_elements,
2160 Pipeline_Use::elaborated_elements,
2161 sizeof(Pipeline_Use::elaborated_elements));
2162 }
2163
2164 // Perform instruction scheduling and bundling over the sequence of
2165 // instructions in backwards order.
2166 void PhaseOutput::ScheduleAndBundle() {
2167
2168 // Don't optimize this if it isn't a method
2169 if (!C->method())
2170 return;
2171
2172 // Don't optimize this if scheduling is disabled
2173 if (!C->do_scheduling())
2174 return;
2175
2176 // Scheduling code works only with pairs (8 bytes) maximum.
2177 // And when the scalable vector register is used, we may spill/unspill
2178 // the whole reg regardless of the max vector size.
2179 if (C->max_vector_size() > 8 ||
2180 (C->max_vector_size() > 0 && Matcher::supports_scalable_vector())) {
2181 return;
2182 }
2183
2184 Compile::TracePhase tp("isched", &timers[_t_instrSched]);
2185
2186 // Create a data structure for all the scheduling information
2187 Scheduling scheduling(Thread::current()->resource_area(), *C);
2188
2189 // Walk backwards over each basic block, computing the needed alignment
2190 // Walk over all the basic blocks
2191 scheduling.DoScheduling();
2192
2193 #ifndef PRODUCT
2194 if (C->trace_opto_output()) {
2195 tty->print("\n---- After ScheduleAndBundle ----\n");
2196 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
2197 tty->print("\nBB#%03d:\n", i);
2198 Block* block = C->cfg()->get_block(i);
2199 for (uint j = 0; j < block->number_of_nodes(); j++) {
2200 Node* n = block->get_node(j);
2201 OptoReg::Name reg = C->regalloc()->get_reg_first(n);
2202 tty->print(" %-6s ", reg >= 0 && reg < REG_COUNT ? Matcher::regName[reg] : "");
2203 n->dump();
2204 }
2205 }
2206 }
2207 #endif
2208 }
2209
2210 // Compute the latency of all the instructions. This is fairly simple,
2211 // because we already have a legal ordering. Walk over the instructions
2212 // from first to last, and compute the latency of the instruction based
2213 // on the latency of the preceding instruction(s).
2214 void Scheduling::ComputeLocalLatenciesForward(const Block *bb) {
2215 #ifndef PRODUCT
2216 if (_cfg->C->trace_opto_output())
2217 tty->print("# -> ComputeLocalLatenciesForward\n");
2218 #endif
2219
2220 // Walk over all the schedulable instructions
2221 for( uint j=_bb_start; j < _bb_end; j++ ) {
2222
2223 // This is a kludge, forcing all latency calculations to start at 1.
2224 // Used to allow latency 0 to force an instruction to the beginning
2225 // of the bb
2226 uint latency = 1;
2227 Node *use = bb->get_node(j);
2228 uint nlen = use->len();
2229
2230 // Walk over all the inputs
2231 for ( uint k=0; k < nlen; k++ ) {
2232 Node *def = use->in(k);
2233 if (!def)
2234 continue;
2235
2236 uint l = _node_latency[def->_idx] + use->latency(k);
2237 if (latency < l)
2238 latency = l;
2239 }
2240
2241 _node_latency[use->_idx] = latency;
2242
2243 #ifndef PRODUCT
2244 if (_cfg->C->trace_opto_output()) {
2245 tty->print("# latency %4d: ", latency);
2246 use->dump();
2247 }
2248 #endif
2249 }
2250
2251 #ifndef PRODUCT
2252 if (_cfg->C->trace_opto_output())
2253 tty->print("# <- ComputeLocalLatenciesForward\n");
2254 #endif
2255
2256 } // end ComputeLocalLatenciesForward
2257
2258 // See if this node fits into the present instruction bundle
2259 bool Scheduling::NodeFitsInBundle(Node *n) {
2260 uint n_idx = n->_idx;
2261
2262 // If this is the unconditional delay instruction, then it fits
2263 if (n == _unconditional_delay_slot) {
2264 #ifndef PRODUCT
2265 if (_cfg->C->trace_opto_output())
2266 tty->print("# NodeFitsInBundle [%4d]: TRUE; is in unconditional delay slot\n", n->_idx);
2267 #endif
2268 return (true);
2269 }
2270
2271 // If the node cannot be scheduled this cycle, skip it
2272 if (_current_latency[n_idx] > _bundle_cycle_number) {
2273 #ifndef PRODUCT
2274 if (_cfg->C->trace_opto_output())
2275 tty->print("# NodeFitsInBundle [%4d]: FALSE; latency %4d > %d\n",
2276 n->_idx, _current_latency[n_idx], _bundle_cycle_number);
2277 #endif
2278 return (false);
2279 }
2280
2281 const Pipeline *node_pipeline = n->pipeline();
2282
2283 uint instruction_count = node_pipeline->instructionCount();
2284 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2285 instruction_count = 0;
2286 else if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2287 instruction_count++;
2288
2289 if (_bundle_instr_count + instruction_count > Pipeline::_max_instrs_per_cycle) {
2290 #ifndef PRODUCT
2291 if (_cfg->C->trace_opto_output())
2292 tty->print("# NodeFitsInBundle [%4d]: FALSE; too many instructions: %d > %d\n",
2293 n->_idx, _bundle_instr_count + instruction_count, Pipeline::_max_instrs_per_cycle);
2294 #endif
2295 return (false);
2296 }
2297
2298 // Don't allow non-machine nodes to be handled this way
2299 if (!n->is_Mach() && instruction_count == 0)
2300 return (false);
2301
2302 // See if there is any overlap
2303 uint delay = _bundle_use.full_latency(0, node_pipeline->resourceUse());
2304
2305 if (delay > 0) {
2306 #ifndef PRODUCT
2307 if (_cfg->C->trace_opto_output())
2308 tty->print("# NodeFitsInBundle [%4d]: FALSE; functional units overlap\n", n_idx);
2309 #endif
2310 return false;
2311 }
2312
2313 #ifndef PRODUCT
2314 if (_cfg->C->trace_opto_output())
2315 tty->print("# NodeFitsInBundle [%4d]: TRUE\n", n_idx);
2316 #endif
2317
2318 return true;
2319 }
2320
2321 Node * Scheduling::ChooseNodeToBundle() {
2322 uint siz = _available.size();
2323
2324 if (siz == 0) {
2325
2326 #ifndef PRODUCT
2327 if (_cfg->C->trace_opto_output())
2328 tty->print("# ChooseNodeToBundle: NULL\n");
2329 #endif
2330 return (NULL);
2331 }
2332
2333 // Fast path, if only 1 instruction in the bundle
2334 if (siz == 1) {
2335 #ifndef PRODUCT
2336 if (_cfg->C->trace_opto_output()) {
2337 tty->print("# ChooseNodeToBundle (only 1): ");
2338 _available[0]->dump();
2339 }
2340 #endif
2341 return (_available[0]);
2342 }
2343
2344 // Don't bother, if the bundle is already full
2345 if (_bundle_instr_count < Pipeline::_max_instrs_per_cycle) {
2346 for ( uint i = 0; i < siz; i++ ) {
2347 Node *n = _available[i];
2348
2349 // Skip projections, we'll handle them another way
2350 if (n->is_Proj())
2351 continue;
2352
2353 // This presupposed that instructions are inserted into the
2354 // available list in a legality order; i.e. instructions that
2355 // must be inserted first are at the head of the list
2356 if (NodeFitsInBundle(n)) {
2357 #ifndef PRODUCT
2358 if (_cfg->C->trace_opto_output()) {
2359 tty->print("# ChooseNodeToBundle: ");
2360 n->dump();
2361 }
2362 #endif
2363 return (n);
2364 }
2365 }
2366 }
2367
2368 // Nothing fits in this bundle, choose the highest priority
2369 #ifndef PRODUCT
2370 if (_cfg->C->trace_opto_output()) {
2371 tty->print("# ChooseNodeToBundle: ");
2372 _available[0]->dump();
2373 }
2374 #endif
2375
2376 return _available[0];
2377 }
2378
2379 void Scheduling::AddNodeToAvailableList(Node *n) {
2380 assert( !n->is_Proj(), "projections never directly made available" );
2381 #ifndef PRODUCT
2382 if (_cfg->C->trace_opto_output()) {
2383 tty->print("# AddNodeToAvailableList: ");
2384 n->dump();
2385 }
2386 #endif
2387
2388 int latency = _current_latency[n->_idx];
2389
2390 // Insert in latency order (insertion sort)
2391 uint i;
2392 for ( i=0; i < _available.size(); i++ )
2393 if (_current_latency[_available[i]->_idx] > latency)
2394 break;
2395
2396 // Special Check for compares following branches
2397 if( n->is_Mach() && _scheduled.size() > 0 ) {
2398 int op = n->as_Mach()->ideal_Opcode();
2399 Node *last = _scheduled[0];
2400 if( last->is_MachIf() && last->in(1) == n &&
2401 ( op == Op_CmpI ||
2402 op == Op_CmpU ||
2403 op == Op_CmpUL ||
2404 op == Op_CmpP ||
2405 op == Op_CmpF ||
2406 op == Op_CmpD ||
2407 op == Op_CmpL ) ) {
2408
2409 // Recalculate position, moving to front of same latency
2410 for ( i=0 ; i < _available.size(); i++ )
2411 if (_current_latency[_available[i]->_idx] >= latency)
2412 break;
2413 }
2414 }
2415
2416 // Insert the node in the available list
2417 _available.insert(i, n);
2418
2419 #ifndef PRODUCT
2420 if (_cfg->C->trace_opto_output())
2421 dump_available();
2422 #endif
2423 }
2424
2425 void Scheduling::DecrementUseCounts(Node *n, const Block *bb) {
2426 for ( uint i=0; i < n->len(); i++ ) {
2427 Node *def = n->in(i);
2428 if (!def) continue;
2429 if( def->is_Proj() ) // If this is a machine projection, then
2430 def = def->in(0); // propagate usage thru to the base instruction
2431
2432 if(_cfg->get_block_for_node(def) != bb) { // Ignore if not block-local
2433 continue;
2434 }
2435
2436 // Compute the latency
2437 uint l = _bundle_cycle_number + n->latency(i);
2438 if (_current_latency[def->_idx] < l)
2439 _current_latency[def->_idx] = l;
2440
2441 // If this does not have uses then schedule it
2442 if ((--_uses[def->_idx]) == 0)
2443 AddNodeToAvailableList(def);
2444 }
2445 }
2446
2447 void Scheduling::AddNodeToBundle(Node *n, const Block *bb) {
2448 #ifndef PRODUCT
2449 if (_cfg->C->trace_opto_output()) {
2450 tty->print("# AddNodeToBundle: ");
2451 n->dump();
2452 }
2453 #endif
2454
2455 // Remove this from the available list
2456 uint i;
2457 for (i = 0; i < _available.size(); i++)
2458 if (_available[i] == n)
2459 break;
2460 assert(i < _available.size(), "entry in _available list not found");
2461 _available.remove(i);
2462
2463 // See if this fits in the current bundle
2464 const Pipeline *node_pipeline = n->pipeline();
2465 const Pipeline_Use& node_usage = node_pipeline->resourceUse();
2466
2467 // Check for instructions to be placed in the delay slot. We
2468 // do this before we actually schedule the current instruction,
2469 // because the delay slot follows the current instruction.
2470 if (Pipeline::_branch_has_delay_slot &&
2471 node_pipeline->hasBranchDelay() &&
2472 !_unconditional_delay_slot) {
2473
2474 uint siz = _available.size();
2475
2476 // Conditional branches can support an instruction that
2477 // is unconditionally executed and not dependent by the
2478 // branch, OR a conditionally executed instruction if
2479 // the branch is taken. In practice, this means that
2480 // the first instruction at the branch target is
2481 // copied to the delay slot, and the branch goes to
2482 // the instruction after that at the branch target
2483 if ( n->is_MachBranch() ) {
2484
2485 assert( !n->is_MachNullCheck(), "should not look for delay slot for Null Check" );
2486 assert( !n->is_Catch(), "should not look for delay slot for Catch" );
2487
2488 #ifndef PRODUCT
2489 _branches++;
2490 #endif
2491
2492 // At least 1 instruction is on the available list
2493 // that is not dependent on the branch
2494 for (uint i = 0; i < siz; i++) {
2495 Node *d = _available[i];
2496 const Pipeline *avail_pipeline = d->pipeline();
2497
2498 // Don't allow safepoints in the branch shadow, that will
2499 // cause a number of difficulties
2500 if ( avail_pipeline->instructionCount() == 1 &&
2501 !avail_pipeline->hasMultipleBundles() &&
2502 !avail_pipeline->hasBranchDelay() &&
2503 Pipeline::instr_has_unit_size() &&
2504 d->size(_regalloc) == Pipeline::instr_unit_size() &&
2505 NodeFitsInBundle(d) &&
2506 !node_bundling(d)->used_in_delay()) {
2507
2508 if (d->is_Mach() && !d->is_MachSafePoint()) {
2509 // A node that fits in the delay slot was found, so we need to
2510 // set the appropriate bits in the bundle pipeline information so
2511 // that it correctly indicates resource usage. Later, when we
2512 // attempt to add this instruction to the bundle, we will skip
2513 // setting the resource usage.
2514 _unconditional_delay_slot = d;
2515 node_bundling(n)->set_use_unconditional_delay();
2516 node_bundling(d)->set_used_in_unconditional_delay();
2517 _bundle_use.add_usage(avail_pipeline->resourceUse());
2518 _current_latency[d->_idx] = _bundle_cycle_number;
2519 _next_node = d;
2520 ++_bundle_instr_count;
2521 #ifndef PRODUCT
2522 _unconditional_delays++;
2523 #endif
2524 break;
2525 }
2526 }
2527 }
2528 }
2529
2530 // No delay slot, add a nop to the usage
2531 if (!_unconditional_delay_slot) {
2532 // See if adding an instruction in the delay slot will overflow
2533 // the bundle.
2534 if (!NodeFitsInBundle(_nop)) {
2535 #ifndef PRODUCT
2536 if (_cfg->C->trace_opto_output())
2537 tty->print("# *** STEP(1 instruction for delay slot) ***\n");
2538 #endif
2539 step(1);
2540 }
2541
2542 _bundle_use.add_usage(_nop->pipeline()->resourceUse());
2543 _next_node = _nop;
2544 ++_bundle_instr_count;
2545 }
2546
2547 // See if the instruction in the delay slot requires a
2548 // step of the bundles
2549 if (!NodeFitsInBundle(n)) {
2550 #ifndef PRODUCT
2551 if (_cfg->C->trace_opto_output())
2552 tty->print("# *** STEP(branch won't fit) ***\n");
2553 #endif
2554 // Update the state information
2555 _bundle_instr_count = 0;
2556 _bundle_cycle_number += 1;
2557 _bundle_use.step(1);
2558 }
2559 }
2560
2561 // Get the number of instructions
2562 uint instruction_count = node_pipeline->instructionCount();
2563 if (node_pipeline->mayHaveNoCode() && n->size(_regalloc) == 0)
2564 instruction_count = 0;
2565
2566 // Compute the latency information
2567 uint delay = 0;
2568
2569 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode()) {
2570 int relative_latency = _current_latency[n->_idx] - _bundle_cycle_number;
2571 if (relative_latency < 0)
2572 relative_latency = 0;
2573
2574 delay = _bundle_use.full_latency(relative_latency, node_usage);
2575
2576 // Does not fit in this bundle, start a new one
2577 if (delay > 0) {
2578 step(delay);
2579
2580 #ifndef PRODUCT
2581 if (_cfg->C->trace_opto_output())
2582 tty->print("# *** STEP(%d) ***\n", delay);
2583 #endif
2584 }
2585 }
2586
2587 // If this was placed in the delay slot, ignore it
2588 if (n != _unconditional_delay_slot) {
2589
2590 if (delay == 0) {
2591 if (node_pipeline->hasMultipleBundles()) {
2592 #ifndef PRODUCT
2593 if (_cfg->C->trace_opto_output())
2594 tty->print("# *** STEP(multiple instructions) ***\n");
2595 #endif
2596 step(1);
2597 }
2598
2599 else if (instruction_count + _bundle_instr_count > Pipeline::_max_instrs_per_cycle) {
2600 #ifndef PRODUCT
2601 if (_cfg->C->trace_opto_output())
2602 tty->print("# *** STEP(%d >= %d instructions) ***\n",
2603 instruction_count + _bundle_instr_count,
2604 Pipeline::_max_instrs_per_cycle);
2605 #endif
2606 step(1);
2607 }
2608 }
2609
2610 if (node_pipeline->hasBranchDelay() && !_unconditional_delay_slot)
2611 _bundle_instr_count++;
2612
2613 // Set the node's latency
2614 _current_latency[n->_idx] = _bundle_cycle_number;
2615
2616 // Now merge the functional unit information
2617 if (instruction_count > 0 || !node_pipeline->mayHaveNoCode())
2618 _bundle_use.add_usage(node_usage);
2619
2620 // Increment the number of instructions in this bundle
2621 _bundle_instr_count += instruction_count;
2622
2623 // Remember this node for later
2624 if (n->is_Mach())
2625 _next_node = n;
2626 }
2627
2628 // It's possible to have a BoxLock in the graph and in the _bbs mapping but
2629 // not in the bb->_nodes array. This happens for debug-info-only BoxLocks.
2630 // 'Schedule' them (basically ignore in the schedule) but do not insert them
2631 // into the block. All other scheduled nodes get put in the schedule here.
2632 int op = n->Opcode();
2633 if( (op == Op_Node && n->req() == 0) || // anti-dependence node OR
2634 (op != Op_Node && // Not an unused antidepedence node and
2635 // not an unallocated boxlock
2636 (OptoReg::is_valid(_regalloc->get_reg_first(n)) || op != Op_BoxLock)) ) {
2637
2638 // Push any trailing projections
2639 if( bb->get_node(bb->number_of_nodes()-1) != n ) {
2640 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
2641 Node *foi = n->fast_out(i);
2642 if( foi->is_Proj() )
2643 _scheduled.push(foi);
2644 }
2645 }
2646
2647 // Put the instruction in the schedule list
2648 _scheduled.push(n);
2649 }
2650
2651 #ifndef PRODUCT
2652 if (_cfg->C->trace_opto_output())
2653 dump_available();
2654 #endif
2655
2656 // Walk all the definitions, decrementing use counts, and
2657 // if a definition has a 0 use count, place it in the available list.
2658 DecrementUseCounts(n,bb);
2659 }
2660
2661 // This method sets the use count within a basic block. We will ignore all
2662 // uses outside the current basic block. As we are doing a backwards walk,
2663 // any node we reach that has a use count of 0 may be scheduled. This also
2664 // avoids the problem of cyclic references from phi nodes, as long as phi
2665 // nodes are at the front of the basic block. This method also initializes
2666 // the available list to the set of instructions that have no uses within this
2667 // basic block.
2668 void Scheduling::ComputeUseCount(const Block *bb) {
2669 #ifndef PRODUCT
2670 if (_cfg->C->trace_opto_output())
2671 tty->print("# -> ComputeUseCount\n");
2672 #endif
2673
2674 // Clear the list of available and scheduled instructions, just in case
2675 _available.clear();
2676 _scheduled.clear();
2677
2678 // No delay slot specified
2679 _unconditional_delay_slot = NULL;
2680
2681 #ifdef ASSERT
2682 for( uint i=0; i < bb->number_of_nodes(); i++ )
2683 assert( _uses[bb->get_node(i)->_idx] == 0, "_use array not clean" );
2684 #endif
2685
2686 // Force the _uses count to never go to zero for unscheduable pieces
2687 // of the block
2688 for( uint k = 0; k < _bb_start; k++ )
2689 _uses[bb->get_node(k)->_idx] = 1;
2690 for( uint l = _bb_end; l < bb->number_of_nodes(); l++ )
2691 _uses[bb->get_node(l)->_idx] = 1;
2692
2693 // Iterate backwards over the instructions in the block. Don't count the
2694 // branch projections at end or the block header instructions.
2695 for( uint j = _bb_end-1; j >= _bb_start; j-- ) {
2696 Node *n = bb->get_node(j);
2697 if( n->is_Proj() ) continue; // Projections handled another way
2698
2699 // Account for all uses
2700 for ( uint k = 0; k < n->len(); k++ ) {
2701 Node *inp = n->in(k);
2702 if (!inp) continue;
2703 assert(inp != n, "no cycles allowed" );
2704 if (_cfg->get_block_for_node(inp) == bb) { // Block-local use?
2705 if (inp->is_Proj()) { // Skip through Proj's
2706 inp = inp->in(0);
2707 }
2708 ++_uses[inp->_idx]; // Count 1 block-local use
2709 }
2710 }
2711
2712 // If this instruction has a 0 use count, then it is available
2713 if (!_uses[n->_idx]) {
2714 _current_latency[n->_idx] = _bundle_cycle_number;
2715 AddNodeToAvailableList(n);
2716 }
2717
2718 #ifndef PRODUCT
2719 if (_cfg->C->trace_opto_output()) {
2720 tty->print("# uses: %3d: ", _uses[n->_idx]);
2721 n->dump();
2722 }
2723 #endif
2724 }
2725
2726 #ifndef PRODUCT
2727 if (_cfg->C->trace_opto_output())
2728 tty->print("# <- ComputeUseCount\n");
2729 #endif
2730 }
2731
2732 // This routine performs scheduling on each basic block in reverse order,
2733 // using instruction latencies and taking into account function unit
2734 // availability.
2735 void Scheduling::DoScheduling() {
2736 #ifndef PRODUCT
2737 if (_cfg->C->trace_opto_output())
2738 tty->print("# -> DoScheduling\n");
2739 #endif
2740
2741 Block *succ_bb = NULL;
2742 Block *bb;
2743 Compile* C = Compile::current();
2744
2745 // Walk over all the basic blocks in reverse order
2746 for (int i = _cfg->number_of_blocks() - 1; i >= 0; succ_bb = bb, i--) {
2747 bb = _cfg->get_block(i);
2748
2749 #ifndef PRODUCT
2750 if (_cfg->C->trace_opto_output()) {
2751 tty->print("# Schedule BB#%03d (initial)\n", i);
2752 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2753 bb->get_node(j)->dump();
2754 }
2755 }
2756 #endif
2757
2758 // On the head node, skip processing
2759 if (bb == _cfg->get_root_block()) {
2760 continue;
2761 }
2762
2763 // Skip empty, connector blocks
2764 if (bb->is_connector())
2765 continue;
2766
2767 // If the following block is not the sole successor of
2768 // this one, then reset the pipeline information
2769 if (bb->_num_succs != 1 || bb->non_connector_successor(0) != succ_bb) {
2770 #ifndef PRODUCT
2771 if (_cfg->C->trace_opto_output()) {
2772 tty->print("*** bundle start of next BB, node %d, for %d instructions\n",
2773 _next_node->_idx, _bundle_instr_count);
2774 }
2775 #endif
2776 step_and_clear();
2777 }
2778
2779 // Leave untouched the starting instruction, any Phis, a CreateEx node
2780 // or Top. bb->get_node(_bb_start) is the first schedulable instruction.
2781 _bb_end = bb->number_of_nodes()-1;
2782 for( _bb_start=1; _bb_start <= _bb_end; _bb_start++ ) {
2783 Node *n = bb->get_node(_bb_start);
2784 // Things not matched, like Phinodes and ProjNodes don't get scheduled.
2785 // Also, MachIdealNodes do not get scheduled
2786 if( !n->is_Mach() ) continue; // Skip non-machine nodes
2787 MachNode *mach = n->as_Mach();
2788 int iop = mach->ideal_Opcode();
2789 if( iop == Op_CreateEx ) continue; // CreateEx is pinned
2790 if( iop == Op_Con ) continue; // Do not schedule Top
2791 if( iop == Op_Node && // Do not schedule PhiNodes, ProjNodes
2792 mach->pipeline() == MachNode::pipeline_class() &&
2793 !n->is_SpillCopy() && !n->is_MachMerge() ) // Breakpoints, Prolog, etc
2794 continue;
2795 break; // Funny loop structure to be sure...
2796 }
2797 // Compute last "interesting" instruction in block - last instruction we
2798 // might schedule. _bb_end points just after last schedulable inst. We
2799 // normally schedule conditional branches (despite them being forced last
2800 // in the block), because they have delay slots we can fill. Calls all
2801 // have their delay slots filled in the template expansions, so we don't
2802 // bother scheduling them.
2803 Node *last = bb->get_node(_bb_end);
2804 // Ignore trailing NOPs.
2805 while (_bb_end > 0 && last->is_Mach() &&
2806 last->as_Mach()->ideal_Opcode() == Op_Con) {
2807 last = bb->get_node(--_bb_end);
2808 }
2809 assert(!last->is_Mach() || last->as_Mach()->ideal_Opcode() != Op_Con, "");
2810 if( last->is_Catch() ||
2811 (last->is_Mach() && last->as_Mach()->ideal_Opcode() == Op_Halt) ) {
2812 // There might be a prior call. Skip it.
2813 while (_bb_start < _bb_end && bb->get_node(--_bb_end)->is_MachProj());
2814 } else if( last->is_MachNullCheck() ) {
2815 // Backup so the last null-checked memory instruction is
2816 // outside the schedulable range. Skip over the nullcheck,
2817 // projection, and the memory nodes.
2818 Node *mem = last->in(1);
2819 do {
2820 _bb_end--;
2821 } while (mem != bb->get_node(_bb_end));
2822 } else {
2823 // Set _bb_end to point after last schedulable inst.
2824 _bb_end++;
2825 }
2826
2827 assert( _bb_start <= _bb_end, "inverted block ends" );
2828
2829 // Compute the register antidependencies for the basic block
2830 ComputeRegisterAntidependencies(bb);
2831 if (C->failing()) return; // too many D-U pinch points
2832
2833 // Compute intra-bb latencies for the nodes
2834 ComputeLocalLatenciesForward(bb);
2835
2836 // Compute the usage within the block, and set the list of all nodes
2837 // in the block that have no uses within the block.
2838 ComputeUseCount(bb);
2839
2840 // Schedule the remaining instructions in the block
2841 while ( _available.size() > 0 ) {
2842 Node *n = ChooseNodeToBundle();
2843 guarantee(n != NULL, "no nodes available");
2844 AddNodeToBundle(n,bb);
2845 }
2846
2847 assert( _scheduled.size() == _bb_end - _bb_start, "wrong number of instructions" );
2848 #ifdef ASSERT
2849 for( uint l = _bb_start; l < _bb_end; l++ ) {
2850 Node *n = bb->get_node(l);
2851 uint m;
2852 for( m = 0; m < _bb_end-_bb_start; m++ )
2853 if( _scheduled[m] == n )
2854 break;
2855 assert( m < _bb_end-_bb_start, "instruction missing in schedule" );
2856 }
2857 #endif
2858
2859 // Now copy the instructions (in reverse order) back to the block
2860 for ( uint k = _bb_start; k < _bb_end; k++ )
2861 bb->map_node(_scheduled[_bb_end-k-1], k);
2862
2863 #ifndef PRODUCT
2864 if (_cfg->C->trace_opto_output()) {
2865 tty->print("# Schedule BB#%03d (final)\n", i);
2866 uint current = 0;
2867 for (uint j = 0; j < bb->number_of_nodes(); j++) {
2868 Node *n = bb->get_node(j);
2869 if( valid_bundle_info(n) ) {
2870 Bundle *bundle = node_bundling(n);
2871 if (bundle->instr_count() > 0 || bundle->flags() > 0) {
2872 tty->print("*** Bundle: ");
2873 bundle->dump();
2874 }
2875 n->dump();
2876 }
2877 }
2878 }
2879 #endif
2880 #ifdef ASSERT
2881 verify_good_schedule(bb,"after block local scheduling");
2882 #endif
2883 }
2884
2885 #ifndef PRODUCT
2886 if (_cfg->C->trace_opto_output())
2887 tty->print("# <- DoScheduling\n");
2888 #endif
2889
2890 // Record final node-bundling array location
2891 _regalloc->C->output()->set_node_bundling_base(_node_bundling_base);
2892
2893 } // end DoScheduling
2894
2895 // Verify that no live-range used in the block is killed in the block by a
2896 // wrong DEF. This doesn't verify live-ranges that span blocks.
2897
2898 // Check for edge existence. Used to avoid adding redundant precedence edges.
2899 static bool edge_from_to( Node *from, Node *to ) {
2900 for( uint i=0; i<from->len(); i++ )
2901 if( from->in(i) == to )
2902 return true;
2903 return false;
2904 }
2905
2906 #ifdef ASSERT
2907 void Scheduling::verify_do_def( Node *n, OptoReg::Name def, const char *msg ) {
2908 // Check for bad kills
2909 if( OptoReg::is_valid(def) ) { // Ignore stores & control flow
2910 Node *prior_use = _reg_node[def];
2911 if( prior_use && !edge_from_to(prior_use,n) ) {
2912 tty->print("%s = ",OptoReg::as_VMReg(def)->name());
2913 n->dump();
2914 tty->print_cr("...");
2915 prior_use->dump();
2916 assert(edge_from_to(prior_use,n), "%s", msg);
2917 }
2918 _reg_node.map(def,NULL); // Kill live USEs
2919 }
2920 }
2921
2922 void Scheduling::verify_good_schedule( Block *b, const char *msg ) {
2923
2924 // Zap to something reasonable for the verify code
2925 _reg_node.clear();
2926
2927 // Walk over the block backwards. Check to make sure each DEF doesn't
2928 // kill a live value (other than the one it's supposed to). Add each
2929 // USE to the live set.
2930 for( uint i = b->number_of_nodes()-1; i >= _bb_start; i-- ) {
2931 Node *n = b->get_node(i);
2932 int n_op = n->Opcode();
2933 if( n_op == Op_MachProj && n->ideal_reg() == MachProjNode::fat_proj ) {
2934 // Fat-proj kills a slew of registers
2935 RegMaskIterator rmi(n->out_RegMask());
2936 while (rmi.has_next()) {
2937 OptoReg::Name kill = rmi.next();
2938 verify_do_def(n, kill, msg);
2939 }
2940 } else if( n_op != Op_Node ) { // Avoid brand new antidependence nodes
2941 // Get DEF'd registers the normal way
2942 verify_do_def( n, _regalloc->get_reg_first(n), msg );
2943 verify_do_def( n, _regalloc->get_reg_second(n), msg );
2944 }
2945
2946 // Now make all USEs live
2947 for( uint i=1; i<n->req(); i++ ) {
2948 Node *def = n->in(i);
2949 assert(def != 0, "input edge required");
2950 OptoReg::Name reg_lo = _regalloc->get_reg_first(def);
2951 OptoReg::Name reg_hi = _regalloc->get_reg_second(def);
2952 if( OptoReg::is_valid(reg_lo) ) {
2953 assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def), "%s", msg);
2954 _reg_node.map(reg_lo,n);
2955 }
2956 if( OptoReg::is_valid(reg_hi) ) {
2957 assert(!_reg_node[reg_hi] || edge_from_to(_reg_node[reg_hi],def), "%s", msg);
2958 _reg_node.map(reg_hi,n);
2959 }
2960 }
2961
2962 }
2963
2964 // Zap to something reasonable for the Antidependence code
2965 _reg_node.clear();
2966 }
2967 #endif
2968
2969 // Conditionally add precedence edges. Avoid putting edges on Projs.
2970 static void add_prec_edge_from_to( Node *from, Node *to ) {
2971 if( from->is_Proj() ) { // Put precedence edge on Proj's input
2972 assert( from->req() == 1 && (from->len() == 1 || from->in(1)==0), "no precedence edges on projections" );
2973 from = from->in(0);
2974 }
2975 if( from != to && // No cycles (for things like LD L0,[L0+4] )
2976 !edge_from_to( from, to ) ) // Avoid duplicate edge
2977 from->add_prec(to);
2978 }
2979
2980 void Scheduling::anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def ) {
2981 if( !OptoReg::is_valid(def_reg) ) // Ignore stores & control flow
2982 return;
2983
2984 Node *pinch = _reg_node[def_reg]; // Get pinch point
2985 if ((pinch == NULL) || _cfg->get_block_for_node(pinch) != b || // No pinch-point yet?
2986 is_def ) { // Check for a true def (not a kill)
2987 _reg_node.map(def_reg,def); // Record def/kill as the optimistic pinch-point
2988 return;
2989 }
2990
2991 Node *kill = def; // Rename 'def' to more descriptive 'kill'
2992 debug_only( def = (Node*)((intptr_t)0xdeadbeef); )
2993
2994 // After some number of kills there _may_ be a later def
2995 Node *later_def = NULL;
2996
2997 Compile* C = Compile::current();
2998
2999 // Finding a kill requires a real pinch-point.
3000 // Check for not already having a pinch-point.
3001 // Pinch points are Op_Node's.
3002 if( pinch->Opcode() != Op_Node ) { // Or later-def/kill as pinch-point?
3003 later_def = pinch; // Must be def/kill as optimistic pinch-point
3004 if ( _pinch_free_list.size() > 0) {
3005 pinch = _pinch_free_list.pop();
3006 } else {
3007 pinch = new Node(1); // Pinch point to-be
3008 }
3009 if (pinch->_idx >= _regalloc->node_regs_max_index()) {
3010 _cfg->C->record_method_not_compilable("too many D-U pinch points");
3011 return;
3012 }
3013 _cfg->map_node_to_block(pinch, b); // Pretend it's valid in this block (lazy init)
3014 _reg_node.map(def_reg,pinch); // Record pinch-point
3015 //regalloc()->set_bad(pinch->_idx); // Already initialized this way.
3016 if( later_def->outcnt() == 0 || later_def->ideal_reg() == MachProjNode::fat_proj ) { // Distinguish def from kill
3017 pinch->init_req(0, C->top()); // set not NULL for the next call
3018 add_prec_edge_from_to(later_def,pinch); // Add edge from kill to pinch
3019 later_def = NULL; // and no later def
3020 }
3021 pinch->set_req(0,later_def); // Hook later def so we can find it
3022 } else { // Else have valid pinch point
3023 if( pinch->in(0) ) // If there is a later-def
3024 later_def = pinch->in(0); // Get it
3025 }
3026
3027 // Add output-dependence edge from later def to kill
3028 if( later_def ) // If there is some original def
3029 add_prec_edge_from_to(later_def,kill); // Add edge from def to kill
3030
3031 // See if current kill is also a use, and so is forced to be the pinch-point.
3032 if( pinch->Opcode() == Op_Node ) {
3033 Node *uses = kill->is_Proj() ? kill->in(0) : kill;
3034 for( uint i=1; i<uses->req(); i++ ) {
3035 if( _regalloc->get_reg_first(uses->in(i)) == def_reg ||
3036 _regalloc->get_reg_second(uses->in(i)) == def_reg ) {
3037 // Yes, found a use/kill pinch-point
3038 pinch->set_req(0,NULL); //
3039 pinch->replace_by(kill); // Move anti-dep edges up
3040 pinch = kill;
3041 _reg_node.map(def_reg,pinch);
3042 return;
3043 }
3044 }
3045 }
3046
3047 // Add edge from kill to pinch-point
3048 add_prec_edge_from_to(kill,pinch);
3049 }
3050
3051 void Scheduling::anti_do_use( Block *b, Node *use, OptoReg::Name use_reg ) {
3052 if( !OptoReg::is_valid(use_reg) ) // Ignore stores & control flow
3053 return;
3054 Node *pinch = _reg_node[use_reg]; // Get pinch point
3055 // Check for no later def_reg/kill in block
3056 if ((pinch != NULL) && _cfg->get_block_for_node(pinch) == b &&
3057 // Use has to be block-local as well
3058 _cfg->get_block_for_node(use) == b) {
3059 if( pinch->Opcode() == Op_Node && // Real pinch-point (not optimistic?)
3060 pinch->req() == 1 ) { // pinch not yet in block?
3061 pinch->del_req(0); // yank pointer to later-def, also set flag
3062 // Insert the pinch-point in the block just after the last use
3063 b->insert_node(pinch, b->find_node(use) + 1);
3064 _bb_end++; // Increase size scheduled region in block
3065 }
3066
3067 add_prec_edge_from_to(pinch,use);
3068 }
3069 }
3070
3071 // We insert antidependences between the reads and following write of
3072 // allocated registers to prevent illegal code motion. Hopefully, the
3073 // number of added references should be fairly small, especially as we
3074 // are only adding references within the current basic block.
3075 void Scheduling::ComputeRegisterAntidependencies(Block *b) {
3076
3077 #ifdef ASSERT
3078 verify_good_schedule(b,"before block local scheduling");
3079 #endif
3080
3081 // A valid schedule, for each register independently, is an endless cycle
3082 // of: a def, then some uses (connected to the def by true dependencies),
3083 // then some kills (defs with no uses), finally the cycle repeats with a new
3084 // def. The uses are allowed to float relative to each other, as are the
3085 // kills. No use is allowed to slide past a kill (or def). This requires
3086 // antidependencies between all uses of a single def and all kills that
3087 // follow, up to the next def. More edges are redundant, because later defs
3088 // & kills are already serialized with true or antidependencies. To keep
3089 // the edge count down, we add a 'pinch point' node if there's more than
3090 // one use or more than one kill/def.
3091
3092 // We add dependencies in one bottom-up pass.
3093
3094 // For each instruction we handle it's DEFs/KILLs, then it's USEs.
3095
3096 // For each DEF/KILL, we check to see if there's a prior DEF/KILL for this
3097 // register. If not, we record the DEF/KILL in _reg_node, the
3098 // register-to-def mapping. If there is a prior DEF/KILL, we insert a
3099 // "pinch point", a new Node that's in the graph but not in the block.
3100 // We put edges from the prior and current DEF/KILLs to the pinch point.
3101 // We put the pinch point in _reg_node. If there's already a pinch point
3102 // we merely add an edge from the current DEF/KILL to the pinch point.
3103
3104 // After doing the DEF/KILLs, we handle USEs. For each used register, we
3105 // put an edge from the pinch point to the USE.
3106
3107 // To be expedient, the _reg_node array is pre-allocated for the whole
3108 // compilation. _reg_node is lazily initialized; it either contains a NULL,
3109 // or a valid def/kill/pinch-point, or a leftover node from some prior
3110 // block. Leftover node from some prior block is treated like a NULL (no
3111 // prior def, so no anti-dependence needed). Valid def is distinguished by
3112 // it being in the current block.
3113 bool fat_proj_seen = false;
3114 uint last_safept = _bb_end-1;
3115 Node* end_node = (_bb_end-1 >= _bb_start) ? b->get_node(last_safept) : NULL;
3116 Node* last_safept_node = end_node;
3117 for( uint i = _bb_end-1; i >= _bb_start; i-- ) {
3118 Node *n = b->get_node(i);
3119 int is_def = n->outcnt(); // def if some uses prior to adding precedence edges
3120 if( n->is_MachProj() && n->ideal_reg() == MachProjNode::fat_proj ) {
3121 // Fat-proj kills a slew of registers
3122 // This can add edges to 'n' and obscure whether or not it was a def,
3123 // hence the is_def flag.
3124 fat_proj_seen = true;
3125 RegMaskIterator rmi(n->out_RegMask());
3126 while (rmi.has_next()) {
3127 OptoReg::Name kill = rmi.next();
3128 anti_do_def(b, n, kill, is_def);
3129 }
3130 } else {
3131 // Get DEF'd registers the normal way
3132 anti_do_def( b, n, _regalloc->get_reg_first(n), is_def );
3133 anti_do_def( b, n, _regalloc->get_reg_second(n), is_def );
3134 }
3135
3136 // Kill projections on a branch should appear to occur on the
3137 // branch, not afterwards, so grab the masks from the projections
3138 // and process them.
3139 if (n->is_MachBranch() || (n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_Jump)) {
3140 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
3141 Node* use = n->fast_out(i);
3142 if (use->is_Proj()) {
3143 RegMaskIterator rmi(use->out_RegMask());
3144 while (rmi.has_next()) {
3145 OptoReg::Name kill = rmi.next();
3146 anti_do_def(b, n, kill, false);
3147 }
3148 }
3149 }
3150 }
3151
3152 // Check each register used by this instruction for a following DEF/KILL
3153 // that must occur afterward and requires an anti-dependence edge.
3154 for( uint j=0; j<n->req(); j++ ) {
3155 Node *def = n->in(j);
3156 if( def ) {
3157 assert( !def->is_MachProj() || def->ideal_reg() != MachProjNode::fat_proj, "" );
3158 anti_do_use( b, n, _regalloc->get_reg_first(def) );
3159 anti_do_use( b, n, _regalloc->get_reg_second(def) );
3160 }
3161 }
3162 // Do not allow defs of new derived values to float above GC
3163 // points unless the base is definitely available at the GC point.
3164
3165 Node *m = b->get_node(i);
3166
3167 // Add precedence edge from following safepoint to use of derived pointer
3168 if( last_safept_node != end_node &&
3169 m != last_safept_node) {
3170 for (uint k = 1; k < m->req(); k++) {
3171 const Type *t = m->in(k)->bottom_type();
3172 if( t->isa_oop_ptr() &&
3173 t->is_ptr()->offset() != 0 ) {
3174 last_safept_node->add_prec( m );
3175 break;
3176 }
3177 }
3178
3179 // Do not allow a CheckCastPP node whose input is a raw pointer to
3180 // float past a safepoint. This can occur when a buffered inline
3181 // type is allocated in a loop and the CheckCastPP from that
3182 // allocation is reused outside the loop. If the use inside the
3183 // loop is scalarized the CheckCastPP will no longer be connected
3184 // to the loop safepoint. See JDK-8264340.
3185 if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CheckCastPP) {
3186 Node *def = m->in(1);
3187 if (def != NULL && def->bottom_type()->base() == Type::RawPtr) {
3188 last_safept_node->add_prec(m);
3189 }
3190 }
3191 }
3192
3193 if( n->jvms() ) { // Precedence edge from derived to safept
3194 // Check if last_safept_node was moved by pinch-point insertion in anti_do_use()
3195 if( b->get_node(last_safept) != last_safept_node ) {
3196 last_safept = b->find_node(last_safept_node);
3197 }
3198 for( uint j=last_safept; j > i; j-- ) {
3199 Node *mach = b->get_node(j);
3200 if( mach->is_Mach() && mach->as_Mach()->ideal_Opcode() == Op_AddP )
3201 mach->add_prec( n );
3202 }
3203 last_safept = i;
3204 last_safept_node = m;
3205 }
3206 }
3207
3208 if (fat_proj_seen) {
3209 // Garbage collect pinch nodes that were not consumed.
3210 // They are usually created by a fat kill MachProj for a call.
3211 garbage_collect_pinch_nodes();
3212 }
3213 }
3214
3215 // Garbage collect pinch nodes for reuse by other blocks.
3216 //
3217 // The block scheduler's insertion of anti-dependence
3218 // edges creates many pinch nodes when the block contains
3219 // 2 or more Calls. A pinch node is used to prevent a
3220 // combinatorial explosion of edges. If a set of kills for a
3221 // register is anti-dependent on a set of uses (or defs), rather
3222 // than adding an edge in the graph between each pair of kill
3223 // and use (or def), a pinch is inserted between them:
3224 //
3225 // use1 use2 use3
3226 // \ | /
3227 // \ | /
3228 // pinch
3229 // / | \
3230 // / | \
3231 // kill1 kill2 kill3
3232 //
3233 // One pinch node is created per register killed when
3234 // the second call is encountered during a backwards pass
3235 // over the block. Most of these pinch nodes are never
3236 // wired into the graph because the register is never
3237 // used or def'ed in the block.
3238 //
3239 void Scheduling::garbage_collect_pinch_nodes() {
3240 #ifndef PRODUCT
3241 if (_cfg->C->trace_opto_output()) tty->print("Reclaimed pinch nodes:");
3242 #endif
3243 int trace_cnt = 0;
3244 for (uint k = 0; k < _reg_node.Size(); k++) {
3245 Node* pinch = _reg_node[k];
3246 if ((pinch != NULL) && pinch->Opcode() == Op_Node &&
3247 // no predecence input edges
3248 (pinch->req() == pinch->len() || pinch->in(pinch->req()) == NULL) ) {
3249 cleanup_pinch(pinch);
3250 _pinch_free_list.push(pinch);
3251 _reg_node.map(k, NULL);
3252 #ifndef PRODUCT
3253 if (_cfg->C->trace_opto_output()) {
3254 trace_cnt++;
3255 if (trace_cnt > 40) {
3256 tty->print("\n");
3257 trace_cnt = 0;
3258 }
3259 tty->print(" %d", pinch->_idx);
3260 }
3261 #endif
3262 }
3263 }
3264 #ifndef PRODUCT
3265 if (_cfg->C->trace_opto_output()) tty->print("\n");
3266 #endif
3267 }
3268
3269 // Clean up a pinch node for reuse.
3270 void Scheduling::cleanup_pinch( Node *pinch ) {
3271 assert (pinch && pinch->Opcode() == Op_Node && pinch->req() == 1, "just checking");
3272
3273 for (DUIterator_Last imin, i = pinch->last_outs(imin); i >= imin; ) {
3274 Node* use = pinch->last_out(i);
3275 uint uses_found = 0;
3276 for (uint j = use->req(); j < use->len(); j++) {
3277 if (use->in(j) == pinch) {
3278 use->rm_prec(j);
3279 uses_found++;
3280 }
3281 }
3282 assert(uses_found > 0, "must be a precedence edge");
3283 i -= uses_found; // we deleted 1 or more copies of this edge
3284 }
3285 // May have a later_def entry
3286 pinch->set_req(0, NULL);
3287 }
3288
3289 #ifndef PRODUCT
3290
3291 void Scheduling::dump_available() const {
3292 tty->print("#Availist ");
3293 for (uint i = 0; i < _available.size(); i++)
3294 tty->print(" N%d/l%d", _available[i]->_idx,_current_latency[_available[i]->_idx]);
3295 tty->cr();
3296 }
3297
3298 // Print Scheduling Statistics
3299 void Scheduling::print_statistics() {
3300 // Print the size added by nops for bundling
3301 tty->print("Nops added %d bytes to total of %d bytes",
3302 _total_nop_size, _total_method_size);
3303 if (_total_method_size > 0)
3304 tty->print(", for %.2f%%",
3305 ((double)_total_nop_size) / ((double) _total_method_size) * 100.0);
3306 tty->print("\n");
3307
3308 // Print the number of branch shadows filled
3309 if (Pipeline::_branch_has_delay_slot) {
3310 tty->print("Of %d branches, %d had unconditional delay slots filled",
3311 _total_branches, _total_unconditional_delays);
3312 if (_total_branches > 0)
3313 tty->print(", for %.2f%%",
3314 ((double)_total_unconditional_delays) / ((double)_total_branches) * 100.0);
3315 tty->print("\n");
3316 }
3317
3318 uint total_instructions = 0, total_bundles = 0;
3319
3320 for (uint i = 1; i <= Pipeline::_max_instrs_per_cycle; i++) {
3321 uint bundle_count = _total_instructions_per_bundle[i];
3322 total_instructions += bundle_count * i;
3323 total_bundles += bundle_count;
3324 }
3325
3326 if (total_bundles > 0)
3327 tty->print("Average ILP (excluding nops) is %.2f\n",
3328 ((double)total_instructions) / ((double)total_bundles));
3329 }
3330 #endif
3331
3332 //-----------------------init_scratch_buffer_blob------------------------------
3333 // Construct a temporary BufferBlob and cache it for this compile.
3334 void PhaseOutput::init_scratch_buffer_blob(int const_size) {
3335 // If there is already a scratch buffer blob allocated and the
3336 // constant section is big enough, use it. Otherwise free the
3337 // current and allocate a new one.
3338 BufferBlob* blob = scratch_buffer_blob();
3339 if ((blob != NULL) && (const_size <= _scratch_const_size)) {
3340 // Use the current blob.
3341 } else {
3342 if (blob != NULL) {
3343 BufferBlob::free(blob);
3344 }
3345
3346 ResourceMark rm;
3347 _scratch_const_size = const_size;
3348 int size = C2Compiler::initial_code_buffer_size(const_size);
3349 if (C->has_scalarized_args()) {
3350 // Inline type entry points (MachVEPNodes) require lots of space for GC barriers and oop verification
3351 // when loading object fields from the buffered argument. Increase scratch buffer size accordingly.
3352 int barrier_size = UseZGC ? 200 : (7 DEBUG_ONLY(+ 37));
3353 for (ciSignatureStream str(C->method()->signature()); !str.at_return_type(); str.next()) {
3354 if (str.is_null_free() && str.type()->as_inline_klass()->can_be_passed_as_fields()) {
3355 size += str.type()->as_inline_klass()->oop_count() * barrier_size;
3356 }
3357 }
3358 }
3359 blob = BufferBlob::create("Compile::scratch_buffer", size);
3360 // Record the buffer blob for next time.
3361 set_scratch_buffer_blob(blob);
3362 // Have we run out of code space?
3363 if (scratch_buffer_blob() == NULL) {
3364 // Let CompilerBroker disable further compilations.
3365 C->record_failure("Not enough space for scratch buffer in CodeCache");
3366 return;
3367 }
3368 }
3369
3370 // Initialize the relocation buffers
3371 relocInfo* locs_buf = (relocInfo*) blob->content_end() - MAX_locs_size;
3372 set_scratch_locs_memory(locs_buf);
3373 }
3374
3375
3376 //-----------------------scratch_emit_size-------------------------------------
3377 // Helper function that computes size by emitting code
3378 uint PhaseOutput::scratch_emit_size(const Node* n) {
3379 // Start scratch_emit_size section.
3380 set_in_scratch_emit_size(true);
3381
3382 // Emit into a trash buffer and count bytes emitted.
3383 // This is a pretty expensive way to compute a size,
3384 // but it works well enough if seldom used.
3385 // All common fixed-size instructions are given a size
3386 // method by the AD file.
3387 // Note that the scratch buffer blob and locs memory are
3388 // allocated at the beginning of the compile task, and
3389 // may be shared by several calls to scratch_emit_size.
3390 // The allocation of the scratch buffer blob is particularly
3391 // expensive, since it has to grab the code cache lock.
3392 BufferBlob* blob = this->scratch_buffer_blob();
3393 assert(blob != NULL, "Initialize BufferBlob at start");
3394 assert(blob->size() > MAX_inst_size, "sanity");
3395 relocInfo* locs_buf = scratch_locs_memory();
3396 address blob_begin = blob->content_begin();
3397 address blob_end = (address)locs_buf;
3398 assert(blob->contains(blob_end), "sanity");
3399 CodeBuffer buf(blob_begin, blob_end - blob_begin);
3400 buf.initialize_consts_size(_scratch_const_size);
3401 buf.initialize_stubs_size(MAX_stubs_size);
3402 assert(locs_buf != NULL, "sanity");
3403 int lsize = MAX_locs_size / 3;
3404 buf.consts()->initialize_shared_locs(&locs_buf[lsize * 0], lsize);
3405 buf.insts()->initialize_shared_locs( &locs_buf[lsize * 1], lsize);
3406 buf.stubs()->initialize_shared_locs( &locs_buf[lsize * 2], lsize);
3407 // Mark as scratch buffer.
3408 buf.consts()->set_scratch_emit();
3409 buf.insts()->set_scratch_emit();
3410 buf.stubs()->set_scratch_emit();
3411
3412 // Do the emission.
3413
3414 Label fakeL; // Fake label for branch instructions.
3415 Label* saveL = NULL;
3416 uint save_bnum = 0;
3417 bool is_branch = n->is_MachBranch();
3418 if (is_branch) {
3419 MacroAssembler masm(&buf);
3420 masm.bind(fakeL);
3421 n->as_MachBranch()->save_label(&saveL, &save_bnum);
3422 n->as_MachBranch()->label_set(&fakeL, 0);
3423 } else if (n->is_MachProlog()) {
3424 saveL = ((MachPrologNode*)n)->_verified_entry;
3425 ((MachPrologNode*)n)->_verified_entry = &fakeL;
3426 } else if (n->is_MachVEP()) {
3427 saveL = ((MachVEPNode*)n)->_verified_entry;
3428 ((MachVEPNode*)n)->_verified_entry = &fakeL;
3429 }
3430 n->emit(buf, C->regalloc());
3431
3432 // Emitting into the scratch buffer should not fail
3433 assert (!C->failing(), "Must not have pending failure. Reason is: %s", C->failure_reason());
3434
3435 // Restore label.
3436 if (is_branch) {
3437 n->as_MachBranch()->label_set(saveL, save_bnum);
3438 } else if (n->is_MachProlog()) {
3439 ((MachPrologNode*)n)->_verified_entry = saveL;
3440 } else if (n->is_MachVEP()) {
3441 ((MachVEPNode*)n)->_verified_entry = saveL;
3442 }
3443
3444 // End scratch_emit_size section.
3445 set_in_scratch_emit_size(false);
3446
3447 return buf.insts_size();
3448 }
3449
3450 void PhaseOutput::install() {
3451 if (!C->should_install_code()) {
3452 return;
3453 } else if (C->stub_function() != NULL) {
3454 install_stub(C->stub_name());
3455 } else {
3456 install_code(C->method(),
3457 C->entry_bci(),
3458 CompileBroker::compiler2(),
3459 C->has_unsafe_access(),
3460 SharedRuntime::is_wide_vector(C->max_vector_size()),
3461 C->rtm_state());
3462 }
3463 }
3464
3465 void PhaseOutput::install_code(ciMethod* target,
3466 int entry_bci,
3467 AbstractCompiler* compiler,
3468 bool has_unsafe_access,
3469 bool has_wide_vectors,
3470 RTMState rtm_state) {
3471 // Check if we want to skip execution of all compiled code.
3472 {
3473 #ifndef PRODUCT
3474 if (OptoNoExecute) {
3475 C->record_method_not_compilable("+OptoNoExecute"); // Flag as failed
3476 return;
3477 }
3478 #endif
3479 Compile::TracePhase tp("install_code", &timers[_t_registerMethod]);
3480
3481 if (C->is_osr_compilation()) {
3482 _code_offsets.set_value(CodeOffsets::Verified_Entry, 0);
3483 _code_offsets.set_value(CodeOffsets::OSR_Entry, _first_block_size);
3484 } else {
3485 _code_offsets.set_value(CodeOffsets::Verified_Entry, _first_block_size);
3486 if (_code_offsets.value(CodeOffsets::Verified_Inline_Entry) == -1) {
3487 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry, _first_block_size);
3488 }
3489 if (_code_offsets.value(CodeOffsets::Verified_Inline_Entry_RO) == -1) {
3490 _code_offsets.set_value(CodeOffsets::Verified_Inline_Entry_RO, _first_block_size);
3491 }
3492 if (_code_offsets.value(CodeOffsets::Entry) == -1) {
3493 _code_offsets.set_value(CodeOffsets::Entry, _first_block_size);
3494 }
3495 _code_offsets.set_value(CodeOffsets::OSR_Entry, 0);
3496 }
3497
3498 C->env()->register_method(target,
3499 entry_bci,
3500 &_code_offsets,
3501 _orig_pc_slot_offset_in_bytes,
3502 code_buffer(),
3503 frame_size_in_words(),
3504 _oop_map_set,
3505 &_handler_table,
3506 &_inc_table,
3507 compiler,
3508 has_unsafe_access,
3509 SharedRuntime::is_wide_vector(C->max_vector_size()),
3510 C->rtm_state(),
3511 C->native_invokers());
3512
3513 if (C->log() != NULL) { // Print code cache state into compiler log
3514 C->log()->code_cache_state();
3515 }
3516 }
3517 }
3518 void PhaseOutput::install_stub(const char* stub_name) {
3519 // Entry point will be accessed using stub_entry_point();
3520 if (code_buffer() == NULL) {
3521 Matcher::soft_match_failure();
3522 } else {
3523 if (PrintAssembly && (WizardMode || Verbose))
3524 tty->print_cr("### Stub::%s", stub_name);
3525
3526 if (!C->failing()) {
3527 assert(C->fixed_slots() == 0, "no fixed slots used for runtime stubs");
3528
3529 // Make the NMethod
3530 // For now we mark the frame as never safe for profile stackwalking
3531 RuntimeStub *rs = RuntimeStub::new_runtime_stub(stub_name,
3532 code_buffer(),
3533 CodeOffsets::frame_never_safe,
3534 // _code_offsets.value(CodeOffsets::Frame_Complete),
3535 frame_size_in_words(),
3536 oop_map_set(),
3537 false);
3538 assert(rs != NULL && rs->is_runtime_stub(), "sanity check");
3539
3540 C->set_stub_entry_point(rs->entry_point());
3541 }
3542 }
3543 }
3544
3545 // Support for bundling info
3546 Bundle* PhaseOutput::node_bundling(const Node *n) {
3547 assert(valid_bundle_info(n), "oob");
3548 return &_node_bundling_base[n->_idx];
3549 }
3550
3551 bool PhaseOutput::valid_bundle_info(const Node *n) {
3552 return (_node_bundling_limit > n->_idx);
3553 }
3554
3555 //------------------------------frame_size_in_words-----------------------------
3556 // frame_slots in units of words
3557 int PhaseOutput::frame_size_in_words() const {
3558 // shift is 0 in LP32 and 1 in LP64
3559 const int shift = (LogBytesPerWord - LogBytesPerInt);
3560 int words = _frame_slots >> shift;
3561 assert( words << shift == _frame_slots, "frame size must be properly aligned in LP64" );
3562 return words;
3563 }
3564
3565 // To bang the stack of this compiled method we use the stack size
3566 // that the interpreter would need in case of a deoptimization. This
3567 // removes the need to bang the stack in the deoptimization blob which
3568 // in turn simplifies stack overflow handling.
3569 int PhaseOutput::bang_size_in_bytes() const {
3570 return MAX2(frame_size_in_bytes() + os::extra_bang_size_in_bytes(), C->interpreter_frame_size());
3571 }
3572
3573 //------------------------------dump_asm---------------------------------------
3574 // Dump formatted assembly
3575 #if defined(SUPPORT_OPTO_ASSEMBLY)
3576 void PhaseOutput::dump_asm_on(outputStream* st, int* pcs, uint pc_limit) {
3577
3578 int pc_digits = 3; // #chars required for pc
3579 int sb_chars = 3; // #chars for "start bundle" indicator
3580 int tab_size = 8;
3581 if (pcs != NULL) {
3582 int max_pc = 0;
3583 for (uint i = 0; i < pc_limit; i++) {
3584 max_pc = (max_pc < pcs[i]) ? pcs[i] : max_pc;
3585 }
3586 pc_digits = ((max_pc < 4096) ? 3 : ((max_pc < 65536) ? 4 : ((max_pc < 65536*256) ? 6 : 8))); // #chars required for pc
3587 }
3588 int prefix_len = ((pc_digits + sb_chars + tab_size - 1)/tab_size)*tab_size;
3589
3590 bool cut_short = false;
3591 st->print_cr("#");
3592 st->print("# "); C->tf()->dump_on(st); st->cr();
3593 st->print_cr("#");
3594
3595 // For all blocks
3596 int pc = 0x0; // Program counter
3597 char starts_bundle = ' ';
3598 C->regalloc()->dump_frame();
3599
3600 Node *n = NULL;
3601 for (uint i = 0; i < C->cfg()->number_of_blocks(); i++) {
3602 if (VMThread::should_terminate()) {
3603 cut_short = true;
3604 break;
3605 }
3606 Block* block = C->cfg()->get_block(i);
3607 if (block->is_connector() && !Verbose) {
3608 continue;
3609 }
3610 n = block->head();
3611 if ((pcs != NULL) && (n->_idx < pc_limit)) {
3612 pc = pcs[n->_idx];
3613 st->print("%*.*x", pc_digits, pc_digits, pc);
3614 }
3615 st->fill_to(prefix_len);
3616 block->dump_head(C->cfg(), st);
3617 if (block->is_connector()) {
3618 st->fill_to(prefix_len);
3619 st->print_cr("# Empty connector block");
3620 } else if (block->num_preds() == 2 && block->pred(1)->is_CatchProj() && block->pred(1)->as_CatchProj()->_con == CatchProjNode::fall_through_index) {
3621 st->fill_to(prefix_len);
3622 st->print_cr("# Block is sole successor of call");
3623 }
3624
3625 // For all instructions
3626 Node *delay = NULL;
3627 for (uint j = 0; j < block->number_of_nodes(); j++) {
3628 if (VMThread::should_terminate()) {
3629 cut_short = true;
3630 break;
3631 }
3632 n = block->get_node(j);
3633 if (valid_bundle_info(n)) {
3634 Bundle* bundle = node_bundling(n);
3635 if (bundle->used_in_unconditional_delay()) {
3636 delay = n;
3637 continue;
3638 }
3639 if (bundle->starts_bundle()) {
3640 starts_bundle = '+';
3641 }
3642 }
3643
3644 if (WizardMode) {
3645 n->dump();
3646 }
3647
3648 if( !n->is_Region() && // Dont print in the Assembly
3649 !n->is_Phi() && // a few noisely useless nodes
3650 !n->is_Proj() &&
3651 !n->is_MachTemp() &&
3652 !n->is_SafePointScalarObject() &&
3653 !n->is_Catch() && // Would be nice to print exception table targets
3654 !n->is_MergeMem() && // Not very interesting
3655 !n->is_top() && // Debug info table constants
3656 !(n->is_Con() && !n->is_Mach())// Debug info table constants
3657 ) {
3658 if ((pcs != NULL) && (n->_idx < pc_limit)) {
3659 pc = pcs[n->_idx];
3660 st->print("%*.*x", pc_digits, pc_digits, pc);
3661 } else {
3662 st->fill_to(pc_digits);
3663 }
3664 st->print(" %c ", starts_bundle);
3665 starts_bundle = ' ';
3666 st->fill_to(prefix_len);
3667 n->format(C->regalloc(), st);
3668 st->cr();
3669 }
3670
3671 // If we have an instruction with a delay slot, and have seen a delay,
3672 // then back up and print it
3673 if (valid_bundle_info(n) && node_bundling(n)->use_unconditional_delay()) {
3674 // Coverity finding - Explicit null dereferenced.
3675 guarantee(delay != NULL, "no unconditional delay instruction");
3676 if (WizardMode) delay->dump();
3677
3678 if (node_bundling(delay)->starts_bundle())
3679 starts_bundle = '+';
3680 if ((pcs != NULL) && (n->_idx < pc_limit)) {
3681 pc = pcs[n->_idx];
3682 st->print("%*.*x", pc_digits, pc_digits, pc);
3683 } else {
3684 st->fill_to(pc_digits);
3685 }
3686 st->print(" %c ", starts_bundle);
3687 starts_bundle = ' ';
3688 st->fill_to(prefix_len);
3689 delay->format(C->regalloc(), st);
3690 st->cr();
3691 delay = NULL;
3692 }
3693
3694 // Dump the exception table as well
3695 if( n->is_Catch() && (Verbose || WizardMode) ) {
3696 // Print the exception table for this offset
3697 _handler_table.print_subtable_for(pc);
3698 }
3699 st->bol(); // Make sure we start on a new line
3700 }
3701 st->cr(); // one empty line between blocks
3702 assert(cut_short || delay == NULL, "no unconditional delay branch");
3703 } // End of per-block dump
3704
3705 if (cut_short) st->print_cr("*** disassembly is cut short ***");
3706 }
3707 #endif
3708
3709 #ifndef PRODUCT
3710 void PhaseOutput::print_statistics() {
3711 Scheduling::print_statistics();
3712 }
3713 #endif