| // Copyright 2022 The Centipede Authors. |
| // |
| // 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 |
| // |
| // https://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 THIRD_PARTY_CENTIPEDE_CALL_GRAPH_H_ |
| #define THIRD_PARTY_CENTIPEDE_CALL_GRAPH_H_ |
| |
| #include <cstddef> |
| #include <cstdint> |
| #include <istream> |
| #include <vector> |
| |
| #include "absl/container/flat_hash_map.h" |
| #include "absl/log/check.h" |
| #include "./centipede/control_flow.h" |
| #include "./centipede/logging.h" |
| |
| namespace centipede { |
| |
| class CallGraph { |
| public: |
| // Reads in the CfTable from __sancov_cfs section. On error it crashes, if the |
| // section is not available, the hash maps will be empty. |
| void InitializeCallGraph(const CFTable& cf_table, const PCTable& pc_table); |
| |
| const std::vector<uintptr_t>& GetFunctionCallees(uintptr_t pc) const { |
| CHECK(IsFunctionEntry(pc)) << VV(pc) << " is not a function entry."; |
| const auto it = call_graph_.find(pc); |
| if (it == call_graph_.cend()) return empty_; |
| return it->second; |
| } |
| const std::vector<uintptr_t>& GetBasicBlockCallees(uintptr_t pc) const { |
| CHECK(basic_blocks_.contains(pc)) << VV(pc) << " is not a basic block."; |
| const auto it = basic_block_callees_.find(pc); |
| if (it == basic_block_callees_.cend()) return empty_; |
| return it->second; |
| } |
| const absl::flat_hash_set<uintptr_t>& GetFunctionEntries() const { |
| return function_entries_; |
| } |
| |
| bool IsFunctionEntry(uintptr_t pc) const { |
| return function_entries_.contains(pc); |
| } |
| |
| private: |
| // call_graph_: the key is function entry PC and value is all the |
| // callees of that function. It keep only non-zero vectors in a map. Meaning |
| // that if a function does not have any callee, it won't be in this map. |
| absl::flat_hash_map<uintptr_t, std::vector<uintptr_t>> call_graph_; |
| // bb_callees_: the key is a basic block PC and value is all callees in |
| // that basic block. It keep only non-zero vectors in a map. Meaning that if a |
| // basic_block does not have any callee, it won't be in this map. |
| absl::flat_hash_map<uintptr_t, std::vector<uintptr_t>> basic_block_callees_; |
| absl::flat_hash_set<uintptr_t> function_entries_; |
| absl::flat_hash_set<uintptr_t> basic_blocks_; |
| std::vector<uintptr_t> empty_; |
| }; |
| |
| } // namespace centipede |
| |
| #endif // THIRD_PARTY_CENTIPEDE_CALL_GRAPH_H_ |