| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/crankshaft/hydrogen-osr.h" |
| |
| #include "src/crankshaft/hydrogen.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // True iff. we are compiling for OSR and the statement is the entry. |
| bool HOsrBuilder::HasOsrEntryAt(IterationStatement* statement) { |
| return statement->OsrEntryId() == builder_->current_info()->osr_ast_id(); |
| } |
| |
| |
| HBasicBlock* HOsrBuilder::BuildOsrLoopEntry(IterationStatement* statement) { |
| DCHECK(HasOsrEntryAt(statement)); |
| |
| Zone* zone = builder_->zone(); |
| HGraph* graph = builder_->graph(); |
| |
| // only one OSR point per compile is allowed. |
| DCHECK(graph->osr() == NULL); |
| |
| // remember this builder as the one OSR builder in the graph. |
| graph->set_osr(this); |
| |
| HBasicBlock* non_osr_entry = graph->CreateBasicBlock(); |
| osr_entry_ = graph->CreateBasicBlock(); |
| HValue* true_value = graph->GetConstantTrue(); |
| HBranch* test = builder_->New<HBranch>(true_value, ToBooleanHint::kNone, |
| non_osr_entry, osr_entry_); |
| builder_->FinishCurrentBlock(test); |
| |
| HBasicBlock* loop_predecessor = graph->CreateBasicBlock(); |
| builder_->Goto(non_osr_entry, loop_predecessor); |
| |
| builder_->set_current_block(osr_entry_); |
| osr_entry_->set_osr_entry(); |
| BailoutId osr_entry_id = statement->OsrEntryId(); |
| |
| HEnvironment *environment = builder_->environment(); |
| int first_expression_index = environment->first_expression_index(); |
| int length = environment->length(); |
| osr_values_ = new(zone) ZoneList<HUnknownOSRValue*>(length, zone); |
| |
| for (int i = 0; i < first_expression_index; ++i) { |
| HUnknownOSRValue* osr_value |
| = builder_->Add<HUnknownOSRValue>(environment, i); |
| environment->Bind(i, osr_value); |
| osr_values_->Add(osr_value, zone); |
| } |
| |
| if (first_expression_index != length) { |
| environment->Drop(length - first_expression_index); |
| for (int i = first_expression_index; i < length; ++i) { |
| HUnknownOSRValue* osr_value |
| = builder_->Add<HUnknownOSRValue>(environment, i); |
| environment->Push(osr_value); |
| osr_values_->Add(osr_value, zone); |
| } |
| } |
| |
| unoptimized_frame_slots_ = |
| environment->local_count() + environment->push_count(); |
| |
| // Keep a copy of the old environment, since the OSR values need it |
| // to figure out where exactly they are located in the unoptimized frame. |
| environment = environment->Copy(); |
| builder_->current_block()->UpdateEnvironment(environment); |
| |
| builder_->Add<HSimulate>(osr_entry_id); |
| builder_->Add<HOsrEntry>(osr_entry_id); |
| HContext* context = builder_->Add<HContext>(); |
| environment->BindContext(context); |
| builder_->Goto(loop_predecessor); |
| loop_predecessor->SetJoinId(statement->EntryId()); |
| builder_->set_current_block(loop_predecessor); |
| |
| // Create the final loop entry |
| osr_loop_entry_ = builder_->BuildLoopEntry(); |
| return osr_loop_entry_; |
| } |
| |
| |
| void HOsrBuilder::FinishGraph() { |
| // do nothing for now. |
| } |
| |
| |
| void HOsrBuilder::FinishOsrValues() { |
| const ZoneList<HPhi*>* phis = osr_loop_entry_->phis(); |
| for (int j = 0; j < phis->length(); j++) { |
| HPhi* phi = phis->at(j); |
| if (phi->HasMergedIndex()) { |
| osr_values_->at(phi->merged_index())->set_incoming_value(phi); |
| } |
| } |
| } |
| |
| } // namespace internal |
| } // namespace v8 |