111 строки
4.5 KiB
C++
111 строки
4.5 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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#ifndef SOURCE_FUZZ_CALL_GRAPH_H_
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#define SOURCE_FUZZ_CALL_GRAPH_H_
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#include <map>
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#include <set>
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace fuzz {
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// Represents the acyclic call graph of a SPIR-V module.
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// The module is assumed to be recursion-free, so there are no cycles in the
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// graph. This class is immutable, so it will need to be recomputed if the
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// module changes.
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class CallGraph {
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public:
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// Creates a call graph corresponding to the given SPIR-V module.
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explicit CallGraph(opt::IRContext* context);
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// Returns a mapping from each function to its number of distinct callers.
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const std::map<uint32_t, uint32_t>& GetFunctionInDegree() const {
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return function_in_degree_;
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}
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// Returns the ids of the functions that |function_id| directly invokes.
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const std::set<uint32_t>& GetDirectCallees(uint32_t function_id) const {
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return call_graph_edges_.at(function_id);
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}
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// Returns the ids of the functions that |function_id| directly or indirectly
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// invokes.
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std::set<uint32_t> GetIndirectCallees(uint32_t function_id) const;
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// Returns the ids of all the functions in the graph in a topological order,
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// in relation to the function calls, which are assumed to be recursion-free.
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const std::vector<uint32_t>& GetFunctionsInTopologicalOrder() const {
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return functions_in_topological_order_;
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}
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// Returns the maximum loop nesting depth from which |function_id| can be
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// called. This is computed inter-procedurally (i.e. if main calls A from
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// depth 2 and A calls B from depth 1, the result will be 3 for A).
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// This is a static analysis, so it's not necessarily true that the depth
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// returned can actually be reached at runtime.
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uint32_t GetMaxCallNestingDepth(uint32_t function_id) const {
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return function_max_loop_nesting_depth_.at(function_id);
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}
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private:
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// Computes |call_graph_edges_| and |function_in_degree_|. For each pair (A,
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// B) of functions such that there is at least a function call from A to B,
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// adds, to |call_to_max_depth|, a mapping from (A, B) to the maximum loop
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// nesting depth (within A) of any such function call.
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void BuildGraphAndGetDepthOfFunctionCalls(
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opt::IRContext* context,
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std::map<std::pair<uint32_t, uint32_t>, uint32_t>* call_to_max_depth);
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// Computes a topological order of the functions in the graph, writing the
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// result to |functions_in_topological_order_|. Assumes that the function
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// calls are recursion-free and that |function_in_degree_| has been computed.
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void ComputeTopologicalOrderOfFunctions();
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// Computes |function_max_loop_nesting_depth_| so that each function is mapped
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// to the maximum loop nesting depth from which it can be called, as described
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// by the comment to GetMaxCallNestingDepth. Assumes that |call_graph_edges_|
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// and |functions_in_topological_order_| have been computed, and that
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// |call_to_max_depth| contains a mapping for each edge in the graph.
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void ComputeInterproceduralFunctionCallDepths(
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const std::map<std::pair<uint32_t, uint32_t>, uint32_t>&
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call_to_max_depth);
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// Pushes the direct callees of |function_id| on to |queue|.
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void PushDirectCallees(uint32_t function_id,
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std::queue<uint32_t>* queue) const;
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// Maps each function id to the ids of its immediate callees.
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std::map<uint32_t, std::set<uint32_t>> call_graph_edges_;
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// For each function id, stores the number of distinct functions that call
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// the function.
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std::map<uint32_t, uint32_t> function_in_degree_;
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// Stores the ids of the functions in a topological order,
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// in relation to the function calls, which are assumed to be recursion-free.
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std::vector<uint32_t> functions_in_topological_order_;
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// For each function id, stores the maximum loop nesting depth that the
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// function can be called from.
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std::map<uint32_t, uint32_t> function_max_loop_nesting_depth_;
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_CALL_GRAPH_H_
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