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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
93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
//===- FDRTraceExpander.cpp -----------------------------------------------===//
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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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#include "llvm/XRay/FDRTraceExpander.h"
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namespace llvm {
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namespace xray {
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void TraceExpander::resetCurrentRecord() {
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if (BuildingFunction)
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C(CurrentRecord);
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BuildingFunction = false;
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CurrentRecord.CallArgs.clear();
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}
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Error TraceExpander::visit(BufferExtents &) {
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resetCurrentRecord();
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return Error::success();
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}
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Error TraceExpander::visit(WallclockRecord &) { return Error::success(); }
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Error TraceExpander::visit(NewCPUIDRecord &R) {
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CPUId = R.cpuid();
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BaseTSC = R.tsc();
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return Error::success();
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}
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Error TraceExpander::visit(TSCWrapRecord &R) {
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BaseTSC = R.tsc();
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return Error::success();
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}
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Error TraceExpander::visit(CustomEventRecord &) {
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// TODO: Support custom event records in the future.
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resetCurrentRecord();
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return Error::success();
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}
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Error TraceExpander::visit(CallArgRecord &R) {
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CurrentRecord.CallArgs.push_back(R.arg());
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CurrentRecord.Type = RecordTypes::ENTER_ARG;
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return Error::success();
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}
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Error TraceExpander::visit(PIDRecord &R) {
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PID = R.pid();
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return Error::success();
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}
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Error TraceExpander::visit(NewBufferRecord &R) {
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if (IgnoringRecords)
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IgnoringRecords = false;
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TID = R.tid();
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if (LogVersion == 2)
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PID = R.tid();
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return Error::success();
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}
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Error TraceExpander::visit(EndBufferRecord &) {
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IgnoringRecords = true;
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resetCurrentRecord();
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return Error::success();
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}
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Error TraceExpander::visit(FunctionRecord &R) {
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resetCurrentRecord();
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if (!IgnoringRecords) {
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BaseTSC += R.delta();
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CurrentRecord.Type = R.recordType();
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CurrentRecord.FuncId = R.functionId();
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CurrentRecord.TSC = BaseTSC;
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CurrentRecord.PId = PID;
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CurrentRecord.TId = TID;
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CurrentRecord.CPU = CPUId;
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BuildingFunction = true;
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}
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return Error::success();
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}
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Error TraceExpander::flush() {
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resetCurrentRecord();
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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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