/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_COMPILER_OPTIMIZING_GRAPH_CHECKER_H_
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#define ART_COMPILER_OPTIMIZING_GRAPH_CHECKER_H_
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#include <ostream>
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#include "base/arena_bit_vector.h"
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#include "base/bit_vector-inl.h"
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#include "base/scoped_arena_allocator.h"
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#include "nodes.h"
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namespace art {
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// A control-flow graph visitor performing various checks.
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class GraphChecker : public HGraphDelegateVisitor {
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public:
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explicit GraphChecker(HGraph* graph, const char* dump_prefix = "art::GraphChecker: ")
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: HGraphDelegateVisitor(graph),
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errors_(graph->GetAllocator()->Adapter(kArenaAllocGraphChecker)),
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dump_prefix_(dump_prefix),
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allocator_(graph->GetArenaStack()),
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seen_ids_(&allocator_, graph->GetCurrentInstructionId(), false, kArenaAllocGraphChecker) {
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seen_ids_.ClearAllBits();
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}
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// Check the whole graph. The pass_change parameter indicates whether changes
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// may have occurred during the just executed pass. The default value is
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// conservatively "true" (something may have changed). The last_size parameter
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// and return value pass along the observed graph sizes.
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size_t Run(bool pass_change = true, size_t last_size = 0);
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void VisitBasicBlock(HBasicBlock* block) override;
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void VisitInstruction(HInstruction* instruction) override;
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void VisitPhi(HPhi* phi) override;
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void VisitBinaryOperation(HBinaryOperation* op) override;
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void VisitBooleanNot(HBooleanNot* instruction) override;
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void VisitBoundType(HBoundType* instruction) override;
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void VisitBoundsCheck(HBoundsCheck* check) override;
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void VisitCheckCast(HCheckCast* check) override;
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void VisitCondition(HCondition* op) override;
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void VisitConstant(HConstant* instruction) override;
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void VisitDeoptimize(HDeoptimize* instruction) override;
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void VisitIf(HIf* instruction) override;
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void VisitInstanceOf(HInstanceOf* check) override;
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void VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) override;
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void VisitLoadException(HLoadException* load) override;
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void VisitNeg(HNeg* instruction) override;
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void VisitPackedSwitch(HPackedSwitch* instruction) override;
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void VisitReturn(HReturn* ret) override;
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void VisitReturnVoid(HReturnVoid* ret) override;
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void VisitSelect(HSelect* instruction) override;
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void VisitTryBoundary(HTryBoundary* try_boundary) override;
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void VisitTypeConversion(HTypeConversion* instruction) override;
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void CheckTypeCheckBitstringInput(HTypeCheckInstruction* check,
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size_t input_pos,
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bool check_value,
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uint32_t expected_value,
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const char* name);
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void HandleTypeCheckInstruction(HTypeCheckInstruction* instruction);
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void HandleLoop(HBasicBlock* loop_header);
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void HandleBooleanInput(HInstruction* instruction, size_t input_index);
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// Was the last visit of the graph valid?
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bool IsValid() const {
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return errors_.empty();
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}
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// Get the list of detected errors.
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const ArenaVector<std::string>& GetErrors() const {
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return errors_;
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}
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// Print detected errors on output stream `os`.
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void Dump(std::ostream& os) const {
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for (size_t i = 0, e = errors_.size(); i < e; ++i) {
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os << dump_prefix_ << errors_[i] << std::endl;
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}
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}
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protected:
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// Report a new error.
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void AddError(const std::string& error) {
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errors_.push_back(error);
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}
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// The block currently visited.
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HBasicBlock* current_block_ = nullptr;
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// Errors encountered while checking the graph.
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ArenaVector<std::string> errors_;
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private:
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// String displayed before dumped errors.
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const char* const dump_prefix_;
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ScopedArenaAllocator allocator_;
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ArenaBitVector seen_ids_;
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DISALLOW_COPY_AND_ASSIGN(GraphChecker);
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};
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} // namespace art
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#endif // ART_COMPILER_OPTIMIZING_GRAPH_CHECKER_H_
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