4c565138b5
In the process: - Add a command-line flag --opt-code-positions to track source position information throughout optimized code. - Add a subclass of the hydrogen graph builder to ensure that the source position is properly set on the graph builder for all generated hydrogen code. - Overhaul handling of source positions in hydrogen to ensure they are passed through to generated code consistently and in most cases transparently. Originally reviewed in this CL: https://codereview.chromium.org/24957003/ Review URL: https://codereview.chromium.org/29123008 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17295 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
126 lines
4.7 KiB
C++
126 lines
4.7 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "hydrogen.h"
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#include "hydrogen-osr.h"
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namespace v8 {
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namespace internal {
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// True iff. we are compiling for OSR and the statement is the entry.
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bool HOsrBuilder::HasOsrEntryAt(IterationStatement* statement) {
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return statement->OsrEntryId() == builder_->current_info()->osr_ast_id();
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}
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HBasicBlock* HOsrBuilder::BuildOsrLoopEntry(IterationStatement* statement) {
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ASSERT(HasOsrEntryAt(statement));
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Zone* zone = builder_->zone();
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HGraph* graph = builder_->graph();
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// only one OSR point per compile is allowed.
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ASSERT(graph->osr() == NULL);
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// remember this builder as the one OSR builder in the graph.
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graph->set_osr(this);
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HBasicBlock* non_osr_entry = graph->CreateBasicBlock();
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osr_entry_ = graph->CreateBasicBlock();
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HValue* true_value = graph->GetConstantTrue();
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HBranch* test = builder_->New<HBranch>(true_value, ToBooleanStub::Types(),
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non_osr_entry, osr_entry_);
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builder_->FinishCurrentBlock(test);
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HBasicBlock* loop_predecessor = graph->CreateBasicBlock();
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builder_->Goto(non_osr_entry, loop_predecessor);
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builder_->set_current_block(osr_entry_);
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osr_entry_->set_osr_entry();
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BailoutId osr_entry_id = statement->OsrEntryId();
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HEnvironment *environment = builder_->environment();
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int first_expression_index = environment->first_expression_index();
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int length = environment->length();
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osr_values_ = new(zone) ZoneList<HUnknownOSRValue*>(length, zone);
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for (int i = 0; i < first_expression_index; ++i) {
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HUnknownOSRValue* osr_value
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= builder_->Add<HUnknownOSRValue>(environment, i);
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environment->Bind(i, osr_value);
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osr_values_->Add(osr_value, zone);
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}
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if (first_expression_index != length) {
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environment->Drop(length - first_expression_index);
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for (int i = first_expression_index; i < length; ++i) {
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HUnknownOSRValue* osr_value
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= builder_->Add<HUnknownOSRValue>(environment, i);
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environment->Push(osr_value);
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osr_values_->Add(osr_value, zone);
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}
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}
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unoptimized_frame_slots_ =
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environment->local_count() + environment->push_count();
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// Keep a copy of the old environment, since the OSR values need it
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// to figure out where exactly they are located in the unoptimized frame.
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environment = environment->Copy();
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builder_->current_block()->UpdateEnvironment(environment);
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builder_->Add<HSimulate>(osr_entry_id);
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builder_->Add<HOsrEntry>(osr_entry_id);
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HContext* context = builder_->Add<HContext>();
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environment->BindContext(context);
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builder_->Goto(loop_predecessor);
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loop_predecessor->SetJoinId(statement->EntryId());
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builder_->set_current_block(loop_predecessor);
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// Create the final loop entry
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osr_loop_entry_ = builder_->BuildLoopEntry();
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return osr_loop_entry_;
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}
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void HOsrBuilder::FinishGraph() {
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// do nothing for now.
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}
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void HOsrBuilder::FinishOsrValues() {
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const ZoneList<HPhi*>* phis = osr_loop_entry_->phis();
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for (int j = 0; j < phis->length(); j++) {
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HPhi* phi = phis->at(j);
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if (phi->HasMergedIndex()) {
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osr_values_->at(phi->merged_index())->set_incoming_value(phi);
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}
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}
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}
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} } // namespace v8::internal
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