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70 lines
2.1 KiB
70 lines
2.1 KiB
// Copyright 2022 The Centipede Authors.
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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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// https://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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#include "./centipede/call_graph.h"
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#include <cstddef>
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#include <cstdint>
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#include <vector>
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#include "absl/log/check.h"
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#include "./centipede/control_flow.h"
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#include "./centipede/pc_info.h"
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namespace fuzztest::internal {
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void CallGraph::InitializeCallGraph(const CFTable &cf_table,
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const PCTable &pc_table) {
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// Find all function entries.
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for (auto pc_info : pc_table) {
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if (pc_info.has_flag(PCInfo::kFuncEntry))
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function_entries_.insert(pc_info.pc);
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}
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uintptr_t current_function_entry = 0;
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for (size_t j = 0; j < cf_table.size();) {
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std::vector<uintptr_t> current_callees;
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auto current_pc = cf_table[j];
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++j;
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basic_blocks_.insert(current_pc);
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if (IsFunctionEntry(current_pc)) current_function_entry = current_pc;
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// Iterate over successors.
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while (cf_table[j]) {
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++j;
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}
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++j; // Step over the delimeter.
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// Iterate over callees.
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while (cf_table[j]) {
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current_callees.push_back(cf_table[j]);
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++j;
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}
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++j; // Step over the delimeter.
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CHECK_LE(j, cf_table.size());
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if (current_callees.empty()) continue;
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basic_block_callees_[current_pc] = current_callees;
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// Append collected callees to the call graph.
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call_graph_[current_function_entry].insert(
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call_graph_[current_function_entry].end(), current_callees.begin(),
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current_callees.end());
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}
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// This should stay empty.
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CHECK(empty_.empty());
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}
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} // namespace fuzztest::internal
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