Line data    Source code

       1             : // Copyright 2013 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include "src/crankshaft/hydrogen-osr.h"
       6             : 
       7             : #include "src/crankshaft/hydrogen.h"
       8             : #include "src/objects-inl.h"
       9             : 
      10             : namespace v8 {
      11             : namespace internal {
      12             : 
      13             : // True iff. we are compiling for OSR and the statement is the entry.
      14       45652 : bool HOsrBuilder::HasOsrEntryAt(IterationStatement* statement) {
      15       91304 :   return statement->OsrEntryId() == builder_->current_info()->osr_ast_id();
      16             : }
      17             : 
      18             : 
      19        2438 : HBasicBlock* HOsrBuilder::BuildOsrLoopEntry(IterationStatement* statement) {
      20             :   DCHECK(HasOsrEntryAt(statement));
      21             : 
      22        7314 :   Zone* zone = builder_->zone();
      23             :   HGraph* graph = builder_->graph();
      24             : 
      25             :   // only one OSR point per compile is allowed.
      26             :   DCHECK(graph->osr() == NULL);
      27             : 
      28             :   // remember this builder as the one OSR builder in the graph.
      29             :   graph->set_osr(this);
      30             : 
      31        2438 :   HBasicBlock* non_osr_entry = graph->CreateBasicBlock();
      32        2438 :   osr_entry_ = graph->CreateBasicBlock();
      33        2438 :   HValue* true_value = graph->GetConstantTrue();
      34             :   HBranch* test = builder_->New<HBranch>(true_value, ToBooleanHint::kNone,
      35        2438 :                                          non_osr_entry, osr_entry_);
      36        2438 :   builder_->FinishCurrentBlock(test);
      37             : 
      38        2438 :   HBasicBlock* loop_predecessor = graph->CreateBasicBlock();
      39        2438 :   builder_->Goto(non_osr_entry, loop_predecessor);
      40             : 
      41        2438 :   builder_->set_current_block(osr_entry_);
      42        2438 :   osr_entry_->set_osr_entry();
      43             :   BailoutId osr_entry_id = statement->OsrEntryId();
      44             : 
      45        4876 :   HEnvironment *environment = builder_->environment();
      46             :   int first_expression_index = environment->first_expression_index();
      47             :   int length = environment->length();
      48        2438 :   osr_values_ = new(zone) ZoneList<HUnknownOSRValue*>(length, zone);
      49             : 
      50       16509 :   for (int i = 0; i < first_expression_index; ++i) {
      51             :     HUnknownOSRValue* osr_value
      52       14071 :         = builder_->Add<HUnknownOSRValue>(environment, i);
      53       14071 :     environment->Bind(i, osr_value);
      54       14071 :     osr_values_->Add(osr_value, zone);
      55             :   }
      56             : 
      57        2438 :   if (first_expression_index != length) {
      58         106 :     environment->Drop(length - first_expression_index);
      59         574 :     for (int i = first_expression_index; i < length; ++i) {
      60             :       HUnknownOSRValue* osr_value
      61         468 :           = builder_->Add<HUnknownOSRValue>(environment, i);
      62             :       environment->Push(osr_value);
      63         468 :       osr_values_->Add(osr_value, zone);
      64             :     }
      65             :   }
      66             : 
      67             :   unoptimized_frame_slots_ =
      68        2438 :       environment->local_count() + environment->push_count();
      69             : 
      70             :   // Keep a copy of the old environment, since the OSR values need it
      71             :   // to figure out where exactly they are located in the unoptimized frame.
      72        2438 :   environment = environment->Copy();
      73        4876 :   builder_->current_block()->UpdateEnvironment(environment);
      74             : 
      75        2438 :   builder_->Add<HSimulate>(osr_entry_id);
      76        2438 :   builder_->Add<HOsrEntry>(osr_entry_id);
      77        2438 :   HContext* context = builder_->Add<HContext>();
      78             :   environment->BindContext(context);
      79        2438 :   builder_->Goto(loop_predecessor);
      80        2438 :   loop_predecessor->SetJoinId(statement->EntryId());
      81        2438 :   builder_->set_current_block(loop_predecessor);
      82             : 
      83             :   // Create the final loop entry
      84        2438 :   osr_loop_entry_ = builder_->BuildLoopEntry();
      85        2438 :   return osr_loop_entry_;
      86             : }
      87             : 
      88             : 
      89      260260 : void HOsrBuilder::FinishGraph() {
      90             :   // do nothing for now.
      91      260260 : }
      92             : 
      93             : 
      94        2369 : void HOsrBuilder::FinishOsrValues() {
      95        2369 :   const ZoneList<HPhi*>* phis = osr_loop_entry_->phis();
      96       12408 :   for (int j = 0; j < phis->length(); j++) {
      97       10039 :     HPhi* phi = phis->at(j);
      98        3835 :     if (phi->HasMergedIndex()) {
      99        7670 :       osr_values_->at(phi->merged_index())->set_incoming_value(phi);
     100             :     }
     101             :   }
     102        2369 : }
     103             : 
     104             : }  // namespace internal
     105             : }  // namespace v8