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+// Copyright (c) 2021 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "source/opt/dataflow.h"
+
+#include <algorithm>
+#include <cstdint>
+
+namespace spvtools {
+namespace opt {
+
+bool DataFlowAnalysis::Enqueue(Instruction* inst) {
+ bool& is_enqueued = on_worklist_[inst];
+ if (is_enqueued) return false;
+ is_enqueued = true;
+ worklist_.push(inst);
+ return true;
+}
+
+DataFlowAnalysis::VisitResult DataFlowAnalysis::RunOnce(
+ Function* function, bool is_first_iteration) {
+ InitializeWorklist(function, is_first_iteration);
+ VisitResult ret = VisitResult::kResultFixed;
+ while (!worklist_.empty()) {
+ Instruction* top = worklist_.front();
+ worklist_.pop();
+ on_worklist_[top] = false;
+ VisitResult result = Visit(top);
+ if (result == VisitResult::kResultChanged) {
+ EnqueueSuccessors(top);
+ ret = VisitResult::kResultChanged;
+ }
+ }
+ return ret;
+}
+
+void DataFlowAnalysis::Run(Function* function) {
+ VisitResult result = RunOnce(function, true);
+ while (result == VisitResult::kResultChanged) {
+ result = RunOnce(function, false);
+ }
+}
+
+void ForwardDataFlowAnalysis::InitializeWorklist(Function* function,
+ bool /*is_first_iteration*/) {
+ context().cfg()->ForEachBlockInReversePostOrder(
+ function->entry().get(), [this](BasicBlock* bb) {
+ if (label_position_ == LabelPosition::kLabelsOnly) {
+ Enqueue(bb->GetLabelInst());
+ return;
+ }
+ if (label_position_ == LabelPosition::kLabelsAtBeginning) {
+ Enqueue(bb->GetLabelInst());
+ }
+ for (Instruction& inst : *bb) {
+ Enqueue(&inst);
+ }
+ if (label_position_ == LabelPosition::kLabelsAtEnd) {
+ Enqueue(bb->GetLabelInst());
+ }
+ });
+}
+
+void ForwardDataFlowAnalysis::EnqueueUsers(Instruction* inst) {
+ context().get_def_use_mgr()->ForEachUser(
+ inst, [this](Instruction* user) { Enqueue(user); });
+}
+
+void ForwardDataFlowAnalysis::EnqueueBlockSuccessors(Instruction* inst) {
+ if (inst->opcode() != SpvOpLabel) return;
+ context()
+ .cfg()
+ ->block(inst->result_id())
+ ->ForEachSuccessorLabel([this](uint32_t* label) {
+ Enqueue(context().cfg()->block(*label)->GetLabelInst());
+ });
+}
+
+} // namespace opt
+} // namespace spvtools