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https://github.com/KhronosGroup/SPIRV-Tools
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77fb303e58
Adds a fuzzer pass that inserts function calls into the module at random. Calls from dead blocks can be arbitrary (so long as they do not introduce recursion), while calls from other blocks can only be to livesafe functions. The change fixes some oversights in transformations to replace constants with uniforms and to obfuscate constants which testing of this fuzzer pass identified.
82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
// 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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