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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.
*/
#ifndef ART_COMPILER_OPTIMIZING_GRAPH_CHECKER_H_
#define ART_COMPILER_OPTIMIZING_GRAPH_CHECKER_H_
#include "nodes.h"
#include <ostream>
namespace art {
// A control-flow graph visitor performing various checks.
class GraphChecker : public HGraphDelegateVisitor {
public:
GraphChecker(ArenaAllocator* allocator, HGraph* graph,
const char* dump_prefix = "art::GraphChecker: ")
: HGraphDelegateVisitor(graph),
allocator_(allocator),
dump_prefix_(dump_prefix),
seen_ids_(allocator, graph->GetCurrentInstructionId(), false) {}
// Check the whole graph (in insertion order).
virtual void Run() { VisitInsertionOrder(); }
// Check `block`.
void VisitBasicBlock(HBasicBlock* block) OVERRIDE;
// Check `instruction`.
void VisitInstruction(HInstruction* instruction) OVERRIDE;
// Perform control-flow graph checks on instruction.
void VisitInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke) OVERRIDE;
// Check that the HasBoundsChecks() flag is set for bounds checks.
void VisitBoundsCheck(HBoundsCheck* check) OVERRIDE;
// Check that HCheckCast and HInstanceOf have HLoadClass as second input.
void VisitCheckCast(HCheckCast* check) OVERRIDE;
void VisitInstanceOf(HInstanceOf* check) OVERRIDE;
// Was the last visit of the graph valid?
bool IsValid() const {
return errors_.empty();
}
// Get the list of detected errors.
const std::vector<std::string>& GetErrors() const {
return errors_;
}
// Print detected errors on output stream `os`.
void Dump(std::ostream& os) const {
for (size_t i = 0, e = errors_.size(); i < e; ++i) {
os << dump_prefix_ << errors_[i] << std::endl;
}
}
protected:
// Report a new error.
void AddError(const std::string& error) {
errors_.push_back(error);
}
ArenaAllocator* const allocator_;
// The block currently visited.
HBasicBlock* current_block_ = nullptr;
// Errors encountered while checking the graph.
std::vector<std::string> errors_;
private:
// String displayed before dumped errors.
const char* const dump_prefix_;
ArenaBitVector seen_ids_;
DISALLOW_COPY_AND_ASSIGN(GraphChecker);
};
// An SSA graph visitor performing various checks.
class SSAChecker : public GraphChecker {
public:
typedef GraphChecker super_type;
// TODO: There's no need to pass a separate allocator as we could get it from the graph.
SSAChecker(ArenaAllocator* allocator, HGraph* graph)
: GraphChecker(allocator, graph, "art::SSAChecker: ") {}
// Check the whole graph (in reverse post-order).
void Run() OVERRIDE {
// VisitReversePostOrder is used instead of VisitInsertionOrder,
// as the latter might visit dead blocks removed by the dominator
// computation.
VisitReversePostOrder();
}
// Perform SSA form checks on `block`.
void VisitBasicBlock(HBasicBlock* block) OVERRIDE;
// Loop-related checks from block `loop_header`.
void CheckLoop(HBasicBlock* loop_header);
// Perform SSA form checks on instructions.
void VisitInstruction(HInstruction* instruction) OVERRIDE;
void VisitPhi(HPhi* phi) OVERRIDE;
void VisitBinaryOperation(HBinaryOperation* op) OVERRIDE;
void VisitCondition(HCondition* op) OVERRIDE;
void VisitIf(HIf* instruction) OVERRIDE;
void VisitBooleanNot(HBooleanNot* instruction) OVERRIDE;
void VisitConstant(HConstant* instruction) OVERRIDE;
void HandleBooleanInput(HInstruction* instruction, size_t input_index);
private:
DISALLOW_COPY_AND_ASSIGN(SSAChecker);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_GRAPH_CHECKER_H_
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