mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
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// Copyright (c) 2020 Google LLC
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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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#include "source/fuzz/call_graph.h"
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#include <queue>
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namespace spvtools {
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namespace fuzz {
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CallGraph::CallGraph(opt::IRContext* context) {
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// Initialize function in-degree and call graph edges to 0 and empty.
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for (auto& function : *context->module()) {
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function_in_degree_[function.result_id()] = 0;
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call_graph_edges_[function.result_id()] = std::set<uint32_t>();
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}
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// Consider every function.
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for (auto& function : *context->module()) {
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// Avoid considering the same callee of this function multiple times by
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// recording known callees.
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std::set<uint32_t> known_callees;
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// Consider every function call instruction in every block.
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for (auto& block : function) {
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for (auto& instruction : block) {
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if (instruction.opcode() != SpvOpFunctionCall) {
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continue;
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}
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// Get the id of the function being called.
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uint32_t callee = instruction.GetSingleWordInOperand(0);
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if (known_callees.count(callee)) {
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// We have already considered a call to this function - ignore it.
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continue;
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}
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// Increase the callee's in-degree and add an edge to the call graph.
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function_in_degree_[callee]++;
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call_graph_edges_[function.result_id()].insert(callee);
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// Mark the callee as 'known'.
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known_callees.insert(callee);
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}
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}
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}
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}
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void CallGraph::PushDirectCallees(uint32_t function_id,
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std::queue<uint32_t>* queue) const {
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for (auto callee : GetDirectCallees(function_id)) {
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queue->push(callee);
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}
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}
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std::set<uint32_t> CallGraph::GetIndirectCallees(uint32_t function_id) const {
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std::set<uint32_t> result;
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std::queue<uint32_t> queue;
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PushDirectCallees(function_id, &queue);
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while (!queue.empty()) {
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auto next = queue.front();
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queue.pop();
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if (result.count(next)) {
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continue;
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}
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result.insert(next);
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PushDirectCallees(next, &queue);
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}
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return result;
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}
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} // namespace fuzz
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} // namespace spvtools
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