BlockIndexer.h

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//===- BlockIndexer.h - FDR Block Indexing Visitor ------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// An implementation of the RecordVisitor which generates a mapping between a
// thread and a range of records representing a block.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_XRAY_BLOCKINDEXER_H
#define LLVM_XRAY_BLOCKINDEXER_H
 
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/Compiler.h"
#include "llvm/XRay/FDRRecords.h"
#include <cstdint>
#include <vector>
 
namespace llvm::xray {
 
// The BlockIndexer will gather all related records associated with a
// process+thread and group them by 'Block'.
class LLVM_ABI BlockIndexer : public RecordVisitor {
public:
  struct Block {
    uint64_t ProcessID;
    int32_t ThreadID;
    WallclockRecord *WallclockTime;
    std::vector<Record *> Records;
  };
 
  // This maps the process + thread combination to a sequence of blocks.
  using Index = DenseMap<std::pair<uint64_t, int32_t>, std::vector<Block>>;
 
private:
  Index &Indices;
 
  Block CurrentBlock{0, 0, nullptr, {}};
 
public:
  explicit BlockIndexer(Index &I) : Indices(I) {}
 
  Error visit(BufferExtents &) override;
  Error visit(WallclockRecord &) override;
  Error visit(NewCPUIDRecord &) override;
  Error visit(TSCWrapRecord &) override;
  Error visit(CustomEventRecord &) override;
  Error visit(CallArgRecord &) override;
  Error visit(PIDRecord &) override;
  Error visit(NewBufferRecord &) override;
  Error visit(EndBufferRecord &) override;
  Error visit(FunctionRecord &) override;
  Error visit(CustomEventRecordV5 &) override;
  Error visit(TypedEventRecord &) override;
 
  /// The flush() function will clear out the current state of the visitor, to
  /// allow for explicitly flushing a block's records to the currently
  /// recognized thread and process combination.
  Error flush();
};
 
} // namespace llvm::xray
 
#endif // LLVM_XRAY_BLOCKINDEXER_H