// Copyright 2013 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include "hydrogen.h" #include "hydrogen-osr.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) { ASSERT(HasOsrEntryAt(statement)); Zone* zone = builder_->zone(); HGraph* graph = builder_->graph(); // only one OSR point per compile is allowed. ASSERT(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, ToBooleanStub::Types(), 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 v8::internal