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  1. //===- BlockVerifier.h - FDR Block Verifier -------------------------------===//
  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. // An implementation of the RecordVisitor which verifies a sequence of records
  10. // associated with a block, following the FDR mode log format's specifications.
  11. //
  12. //===----------------------------------------------------------------------===//
  13. #ifndef LLVM_XRAY_BLOCKVERIFIER_H
  14. #define LLVM_XRAY_BLOCKVERIFIER_H
  15.  
  16. #include "llvm/XRay/FDRRecords.h"
  17. #include <array>
  18. #include <bitset>
  19.  
  20. namespace llvm {
  21. namespace xray {
  22.  
  23. class BlockVerifier : public RecordVisitor {
  24. public:
  25.   // We force State elements to be size_t, to be used as indices for containers.
  26.   enum class State : std::size_t {
  27.     Unknown,
  28.     BufferExtents,
  29.     NewBuffer,
  30.     WallClockTime,
  31.     PIDEntry,
  32.     NewCPUId,
  33.     TSCWrap,
  34.     CustomEvent,
  35.     TypedEvent,
  36.     Function,
  37.     CallArg,
  38.     EndOfBuffer,
  39.     StateMax,
  40.   };
  41.  
  42. private:
  43.   // We keep track of the current record seen by the verifier.
  44.   State CurrentRecord = State::Unknown;
  45.  
  46.   // Transitions the current record to the new record, records an error on
  47.   // invalid transitions.
  48.   Error transition(State To);
  49.  
  50. public:
  51.   Error visit(BufferExtents &) override;
  52.   Error visit(WallclockRecord &) override;
  53.   Error visit(NewCPUIDRecord &) override;
  54.   Error visit(TSCWrapRecord &) override;
  55.   Error visit(CustomEventRecord &) override;
  56.   Error visit(CallArgRecord &) override;
  57.   Error visit(PIDRecord &) override;
  58.   Error visit(NewBufferRecord &) override;
  59.   Error visit(EndBufferRecord &) override;
  60.   Error visit(FunctionRecord &) override;
  61.   Error visit(CustomEventRecordV5 &) override;
  62.   Error visit(TypedEventRecord &) override;
  63.  
  64.   Error verify();
  65.   void reset();
  66. };
  67.  
  68. } // namespace xray
  69. } // namespace llvm
  70.  
  71. #endif // LLVM_XRAY_BLOCKVERIFIER_H
  72.