SPIRV-Tools/source/fuzz/call_graph.h

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// Copyright (c) 2020 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.
#ifndef SOURCE_FUZZ_CALL_GRAPH_H_
#define SOURCE_FUZZ_CALL_GRAPH_H_
#include <map>
#include <set>
#include "source/opt/ir_context.h"
namespace spvtools {
namespace fuzz {
// Represents the acyclic call graph of a SPIR-V module.
class CallGraph {
public:
// Creates a call graph corresponding to the given SPIR-V module.
explicit CallGraph(opt::IRContext* context);
// Returns a mapping from each function to its number of distinct callers.
const std::map<uint32_t, uint32_t>& GetFunctionInDegree() const {
return function_in_degree_;
}
// Returns the ids of the functions that |function_id| directly invokes.
const std::set<uint32_t>& GetDirectCallees(uint32_t function_id) const {
return call_graph_edges_.at(function_id);
}
// Returns the ids of the functions that |function_id| directly or indirectly
// invokes.
std::set<uint32_t> GetIndirectCallees(uint32_t function_id) const;
private:
// Pushes the direct callees of |function_id| on to |queue|.
void PushDirectCallees(uint32_t function_id,
std::queue<uint32_t>* queue) const;
// Maps each function id to the ids of its immediate callees.
std::map<uint32_t, std::set<uint32_t>> call_graph_edges_;
// For each function id, stores the number of distinct functions that call
// the function.
std::map<uint32_t, uint32_t> function_in_degree_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_CALL_GRAPH_H_