985c2b9226
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
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
//===- BlockIndexer.cpp - 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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#include "llvm/XRay/BlockIndexer.h"
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namespace llvm {
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namespace xray {
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Error BlockIndexer::visit(BufferExtents &) {
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if (CurrentState == State::ThreadIDFound) {
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Index::iterator It;
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std::tie(It, std::ignore) =
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Indices.insert({{CurrentBlock.ProcessID, CurrentBlock.ThreadID}, {}});
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It->second.push_back({CurrentBlock.ProcessID, CurrentBlock.ThreadID,
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CurrentBlock.WallclockTime,
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std::move(CurrentBlock.Records)});
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CurrentBlock.ProcessID = 0;
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CurrentBlock.ThreadID = 0;
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CurrentBlock.WallclockTime = nullptr;
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CurrentBlock.Records = {};
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}
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CurrentState = State::ExtentsFound;
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return Error::success();
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}
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Error BlockIndexer::visit(WallclockRecord &R) {
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CurrentBlock.Records.push_back(&R);
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CurrentBlock.WallclockTime = &R;
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return Error::success();
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}
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Error BlockIndexer::visit(NewCPUIDRecord &R) {
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(TSCWrapRecord &R) {
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(CustomEventRecord &R) {
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(CallArgRecord &R) {
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(PIDRecord &R) {
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CurrentBlock.ProcessID = R.pid();
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(NewBufferRecord &R) {
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CurrentState = State::ThreadIDFound;
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CurrentBlock.ThreadID = R.tid();
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(EndBufferRecord &R) {
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CurrentState = State::SeekExtents;
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::visit(FunctionRecord &R) {
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CurrentBlock.Records.push_back(&R);
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return Error::success();
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}
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Error BlockIndexer::flush() {
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CurrentState = State::SeekExtents;
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Index::iterator It;
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std::tie(It, std::ignore) =
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Indices.insert({{CurrentBlock.ProcessID, CurrentBlock.ThreadID}, {}});
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It->second.push_back({CurrentBlock.ProcessID, CurrentBlock.ThreadID,
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CurrentBlock.WallclockTime,
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std::move(CurrentBlock.Records)});
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CurrentBlock.ProcessID = 0;
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CurrentBlock.ThreadID = 0;
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CurrentBlock.Records = {};
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return Error::success();
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}
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} // namespace xray
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} // namespace llvm
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