clang  10.0.0svn
MPIChecker.h
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1 //===-- MPIChecker.h - Verify MPI API usage- --------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file defines the main class of MPI-Checker which serves as an entry
11 /// point. It is created once for each translation unit analysed.
12 /// The checker defines path-sensitive checks, to verify correct usage of the
13 /// MPI API.
14 ///
15 //===----------------------------------------------------------------------===//
16 
17 #ifndef LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_MPICHECKER_MPICHECKER_H
18 #define LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_MPICHECKER_MPICHECKER_H
19 
20 #include "MPIBugReporter.h"
21 #include "MPITypes.h"
25 
26 namespace clang {
27 namespace ento {
28 namespace mpi {
29 
30 class MPIChecker : public Checker<check::PreCall, check::DeadSymbols> {
31 public:
32  MPIChecker() : BReporter(*this) {}
33 
34  // path-sensitive callbacks
35  void checkPreCall(const CallEvent &CE, CheckerContext &Ctx) const {
36  dynamicInit(Ctx);
37  checkUnmatchedWaits(CE, Ctx);
38  checkDoubleNonblocking(CE, Ctx);
39  }
40 
41  void checkDeadSymbols(SymbolReaper &SymReaper, CheckerContext &Ctx) const {
42  dynamicInit(Ctx);
43  checkMissingWaits(SymReaper, Ctx);
44  }
45 
46  void dynamicInit(CheckerContext &Ctx) const {
47  if (FuncClassifier)
48  return;
49  const_cast<std::unique_ptr<MPIFunctionClassifier> &>(FuncClassifier)
50  .reset(new MPIFunctionClassifier{Ctx.getASTContext()});
51  }
52 
53  /// Checks if a request is used by nonblocking calls multiple times
54  /// in sequence without intermediate wait. The check contains a guard,
55  /// in order to only inspect nonblocking functions.
56  ///
57  /// \param PreCallEvent MPI call to verify
58  void checkDoubleNonblocking(const clang::ento::CallEvent &PreCallEvent,
59  clang::ento::CheckerContext &Ctx) const;
60 
61  /// Checks if the request used by the wait function was not used at all
62  /// before. The check contains a guard, in order to only inspect wait
63  /// functions.
64  ///
65  /// \param PreCallEvent MPI call to verify
66  void checkUnmatchedWaits(const clang::ento::CallEvent &PreCallEvent,
67  clang::ento::CheckerContext &Ctx) const;
68 
69  /// Check if a nonblocking call is not matched by a wait.
70  /// If a memory region is not alive and the last function using the
71  /// request was a nonblocking call, this is rated as a missing wait.
73  clang::ento::CheckerContext &Ctx) const;
74 
75 private:
76  /// Collects all memory regions of a request(array) used by a wait
77  /// function. If the wait function uses a single request, this is a single
78  /// region. For wait functions using multiple requests, multiple regions
79  /// representing elements in the array are collected.
80  ///
81  /// \param ReqRegions vector the regions get pushed into
82  /// \param MR top most region to iterate
83  /// \param CE MPI wait call using the request(s)
84  void allRegionsUsedByWait(
86  const clang::ento::MemRegion *const MR, const clang::ento::CallEvent &CE,
87  clang::ento::CheckerContext &Ctx) const;
88 
89  /// Returns the memory region used by a wait function.
90  /// Distinguishes between MPI_Wait and MPI_Waitall.
91  ///
92  /// \param CE MPI wait call
94  topRegionUsedByWait(const clang::ento::CallEvent &CE) const;
95 
96  const std::unique_ptr<MPIFunctionClassifier> FuncClassifier;
97  MPIBugReporter BReporter;
98 };
99 
100 } // end of namespace: mpi
101 } // end of namespace: ento
102 } // end of namespace: clang
103 
104 #endif
This file provides definitions to model concepts of MPI.
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:94
void checkDeadSymbols(SymbolReaper &SymReaper, CheckerContext &Ctx) const
Definition: MPIChecker.h:41
void checkDoubleNonblocking(const clang::ento::CallEvent &PreCallEvent, clang::ento::CheckerContext &Ctx) const
Checks if a request is used by nonblocking calls multiple times in sequence without intermediate wait...
Definition: MPIChecker.cpp:24
void checkPreCall(const CallEvent &CE, CheckerContext &Ctx) const
Definition: MPIChecker.h:35
void dynamicInit(CheckerContext &Ctx) const
Definition: MPIChecker.h:46
This file defines functionality to identify and classify MPI functions.
A class responsible for cleaning up unused symbols.
Dataflow Directional Tag Classes.
Represents an abstract call to a function or method along a particular path.
Definition: CallEvent.h:138
void checkUnmatchedWaits(const clang::ento::CallEvent &PreCallEvent, clang::ento::CheckerContext &Ctx) const
Checks if the request used by the wait function was not used at all before.
Definition: MPIChecker.cpp:56
This file defines prefabricated reports which are emitted in case of MPI related bugs, detected by path-sensitive analysis.
void checkMissingWaits(clang::ento::SymbolReaper &SymReaper, clang::ento::CheckerContext &Ctx) const
Check if a nonblocking call is not matched by a wait.
Definition: MPIChecker.cpp:100