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76f5aab534
Summary: In this change, we overhaul the implementation for loading `llvm::xray::Trace` objects from files by using the combination of specific FDR Record types and visitors breaking up the logic to reconstitute an execution trace from flight-data recorder mode traces. This change allows us to handle out-of-temporal order blocks as written in files, and more consistently recreate an execution trace spanning multiple blocks and threads. To do this, we use the `WallclockRecord` associated with each block to maintain temporal order of blocks, before attempting to recreate an execution trace. The new addition in this change is the `TraceExpander` type which can be thought of as a decompression/decoding routine. This allows us to maintain the state of an execution environment (thread+process) and create `XRayRecord` instances that fit nicely into the `Trace` container. We don't have a specific unit test for the TraceExpander type, since the end-to-end tests for the `llvm-xray convert` tools already cover precisely this codepath. This change completes the refactoring started with D50441. Depends on D51911. Reviewers: mboerger, eizan Subscribers: mgorny, hiraditya, mgrang, llvm-commits Differential Revision: https://reviews.llvm.org/D51912 llvm-svn: 341906
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===- BlockIndexer.h - FDR Block Indexing Visitor ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// An implementation of the RecordVisitor which generates a mapping between a
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// thread and a range of records representing a block.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_XRAY_BLOCKINDEXER_H_
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#define LLVM_LIB_XRAY_BLOCKINDEXER_H_
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/XRay/FDRRecords.h"
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#include <cstdint>
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#include <vector>
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namespace llvm {
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namespace xray {
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// The BlockIndexer will gather all related records associated with a
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// process+thread and group them by 'Block'.
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class BlockIndexer : public RecordVisitor {
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public:
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struct Block {
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uint64_t ProcessID;
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int32_t ThreadID;
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WallclockRecord *WallclockTime;
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std::vector<Record *> Records;
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};
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// This maps the process + thread combination to a sequence of blocks.
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using Index = DenseMap<std::pair<uint64_t, int32_t>, std::vector<Block>>;
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private:
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Index &Indices;
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enum class State : unsigned { SeekExtents, ExtentsFound, ThreadIDFound };
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State CurrentState = State::SeekExtents;
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Block CurrentBlock{0, 0, nullptr, {}};
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public:
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explicit BlockIndexer(Index &I) : RecordVisitor(), Indices(I) {}
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Error visit(BufferExtents &) override;
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Error visit(WallclockRecord &) override;
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Error visit(NewCPUIDRecord &) override;
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Error visit(TSCWrapRecord &) override;
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Error visit(CustomEventRecord &) override;
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Error visit(CallArgRecord &) override;
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Error visit(PIDRecord &) override;
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Error visit(NewBufferRecord &) override;
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Error visit(EndBufferRecord &) override;
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Error visit(FunctionRecord &) override;
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/// The flush() function will clear out the current state of the visitor, to
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/// allow for explicitly flushing a block's records to the currently
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/// recognized thread and process combination.
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Error flush();
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};
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} // namespace xray
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} // namespace llvm
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#endif // LLVM_LIB_XRAY_BLOCKINDEXER_H_
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