forked from OSchip/llvm-project
416 lines
16 KiB
C++
416 lines
16 KiB
C++
//===- xray-converter.cpp: XRay Trace Conversion --------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Implements the trace conversion functions.
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//
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//===----------------------------------------------------------------------===//
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#include "xray-converter.h"
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#include "trie-node.h"
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#include "xray-registry.h"
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#include "llvm/DebugInfo/Symbolize/Symbolize.h"
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#include "llvm/Support/EndianStream.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/FormatVariadic.h"
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#include "llvm/Support/ScopedPrinter.h"
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#include "llvm/Support/YAMLTraits.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/XRay/InstrumentationMap.h"
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#include "llvm/XRay/Trace.h"
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#include "llvm/XRay/YAMLXRayRecord.h"
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using namespace llvm;
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using namespace xray;
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// llvm-xray convert
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// ----------------------------------------------------------------------------
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static cl::SubCommand Convert("convert", "Trace Format Conversion");
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static cl::opt<std::string> ConvertInput(cl::Positional,
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cl::desc("<xray log file>"),
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cl::Required, cl::sub(Convert));
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enum class ConvertFormats { BINARY, YAML, CHROME_TRACE_EVENT };
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static cl::opt<ConvertFormats> ConvertOutputFormat(
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"output-format", cl::desc("output format"),
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cl::values(clEnumValN(ConvertFormats::BINARY, "raw", "output in binary"),
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clEnumValN(ConvertFormats::YAML, "yaml", "output in yaml"),
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clEnumValN(ConvertFormats::CHROME_TRACE_EVENT, "trace_event",
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"Output in chrome's trace event format. "
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"May be visualized with the Catapult trace viewer.")),
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cl::sub(Convert));
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static cl::alias ConvertOutputFormat2("f", cl::aliasopt(ConvertOutputFormat),
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cl::desc("Alias for -output-format"));
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static cl::opt<std::string>
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ConvertOutput("output", cl::value_desc("output file"), cl::init("-"),
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cl::desc("output file; use '-' for stdout"),
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cl::sub(Convert));
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static cl::alias ConvertOutput2("o", cl::aliasopt(ConvertOutput),
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cl::desc("Alias for -output"));
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static cl::opt<bool>
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ConvertSymbolize("symbolize",
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cl::desc("symbolize function ids from the input log"),
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cl::init(false), cl::sub(Convert));
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static cl::alias ConvertSymbolize2("y", cl::aliasopt(ConvertSymbolize),
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cl::desc("Alias for -symbolize"));
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static cl::opt<std::string>
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ConvertInstrMap("instr_map",
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cl::desc("binary with the instrumentation map, or "
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"a separate instrumentation map"),
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cl::value_desc("binary with xray_instr_map"),
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cl::sub(Convert), cl::init(""));
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static cl::alias ConvertInstrMap2("m", cl::aliasopt(ConvertInstrMap),
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cl::desc("Alias for -instr_map"));
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static cl::opt<bool> ConvertSortInput(
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"sort",
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cl::desc("determines whether to sort input log records by timestamp"),
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cl::sub(Convert), cl::init(true));
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static cl::alias ConvertSortInput2("s", cl::aliasopt(ConvertSortInput),
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cl::desc("Alias for -sort"));
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using llvm::yaml::Output;
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void TraceConverter::exportAsYAML(const Trace &Records, raw_ostream &OS) {
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YAMLXRayTrace Trace;
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const auto &FH = Records.getFileHeader();
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Trace.Header = {FH.Version, FH.Type, FH.ConstantTSC, FH.NonstopTSC,
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FH.CycleFrequency};
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Trace.Records.reserve(Records.size());
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for (const auto &R : Records) {
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Trace.Records.push_back({R.RecordType, R.CPU, R.Type, R.FuncId,
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Symbolize ? FuncIdHelper.SymbolOrNumber(R.FuncId)
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: llvm::to_string(R.FuncId),
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R.TSC, R.TId, R.PId, R.CallArgs, R.Data});
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}
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Output Out(OS, nullptr, 0);
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Out.setWriteDefaultValues(false);
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Out << Trace;
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}
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void TraceConverter::exportAsRAWv1(const Trace &Records, raw_ostream &OS) {
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// First write out the file header, in the correct endian-appropriate format
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// (XRay assumes currently little endian).
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support::endian::Writer Writer(OS, support::endianness::little);
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const auto &FH = Records.getFileHeader();
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Writer.write(FH.Version);
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Writer.write(FH.Type);
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uint32_t Bitfield{0};
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if (FH.ConstantTSC)
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Bitfield |= 1uL;
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if (FH.NonstopTSC)
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Bitfield |= 1uL << 1;
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Writer.write(Bitfield);
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Writer.write(FH.CycleFrequency);
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// There's 16 bytes of padding at the end of the file header.
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static constexpr uint32_t Padding4B = 0;
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Writer.write(Padding4B);
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Writer.write(Padding4B);
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Writer.write(Padding4B);
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Writer.write(Padding4B);
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// Then write out the rest of the records, still in an endian-appropriate
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// format.
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for (const auto &R : Records) {
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switch (R.Type) {
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case RecordTypes::ENTER:
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case RecordTypes::ENTER_ARG:
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Writer.write(R.RecordType);
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Writer.write(static_cast<uint8_t>(R.CPU));
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Writer.write(uint8_t{0});
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break;
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case RecordTypes::EXIT:
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Writer.write(R.RecordType);
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Writer.write(static_cast<uint8_t>(R.CPU));
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Writer.write(uint8_t{1});
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break;
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case RecordTypes::TAIL_EXIT:
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Writer.write(R.RecordType);
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Writer.write(static_cast<uint8_t>(R.CPU));
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Writer.write(uint8_t{2});
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break;
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case RecordTypes::CUSTOM_EVENT:
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case RecordTypes::TYPED_EVENT:
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// Skip custom and typed event records for v1 logs.
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continue;
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}
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Writer.write(R.FuncId);
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Writer.write(R.TSC);
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Writer.write(R.TId);
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if (FH.Version >= 3)
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Writer.write(R.PId);
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else
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Writer.write(Padding4B);
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Writer.write(Padding4B);
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Writer.write(Padding4B);
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}
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}
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namespace {
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// A structure that allows building a dictionary of stack ids for the Chrome
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// trace event format.
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struct StackIdData {
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// Each Stack of function calls has a unique ID.
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unsigned id;
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// Bookkeeping so that IDs can be maintained uniquely across threads.
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// Traversal keeps sibling pointers to other threads stacks. This is helpful
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// to determine when a thread encounters a new stack and should assign a new
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// unique ID.
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SmallVector<TrieNode<StackIdData> *, 4> siblings;
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};
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using StackTrieNode = TrieNode<StackIdData>;
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// A helper function to find the sibling nodes for an encountered function in a
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// thread of execution. Relies on the invariant that each time a new node is
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// traversed in a thread, sibling bidirectional pointers are maintained.
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SmallVector<StackTrieNode *, 4>
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findSiblings(StackTrieNode *parent, int32_t FnId, uint32_t TId,
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const DenseMap<uint32_t, SmallVector<StackTrieNode *, 4>>
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&StackRootsByThreadId) {
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SmallVector<StackTrieNode *, 4> Siblings{};
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if (parent == nullptr) {
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for (auto map_iter : StackRootsByThreadId) {
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// Only look for siblings in other threads.
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if (map_iter.first != TId)
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for (auto node_iter : map_iter.second) {
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if (node_iter->FuncId == FnId)
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Siblings.push_back(node_iter);
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}
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}
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return Siblings;
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}
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for (auto *ParentSibling : parent->ExtraData.siblings)
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for (auto node_iter : ParentSibling->Callees)
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if (node_iter->FuncId == FnId)
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Siblings.push_back(node_iter);
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return Siblings;
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}
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// Given a function being invoked in a thread with id TId, finds and returns the
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// StackTrie representing the function call stack. If no node exists, creates
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// the node. Assigns unique IDs to stacks newly encountered among all threads
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// and keeps sibling links up to when creating new nodes.
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StackTrieNode *findOrCreateStackNode(
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StackTrieNode *Parent, int32_t FuncId, uint32_t TId,
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DenseMap<uint32_t, SmallVector<StackTrieNode *, 4>> &StackRootsByThreadId,
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DenseMap<unsigned, StackTrieNode *> &StacksByStackId, unsigned *id_counter,
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std::forward_list<StackTrieNode> &NodeStore) {
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SmallVector<StackTrieNode *, 4> &ParentCallees =
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Parent == nullptr ? StackRootsByThreadId[TId] : Parent->Callees;
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auto match = find_if(ParentCallees, [FuncId](StackTrieNode *ParentCallee) {
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return FuncId == ParentCallee->FuncId;
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});
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if (match != ParentCallees.end())
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return *match;
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SmallVector<StackTrieNode *, 4> siblings =
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findSiblings(Parent, FuncId, TId, StackRootsByThreadId);
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if (siblings.empty()) {
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NodeStore.push_front({FuncId, Parent, {}, {(*id_counter)++, {}}});
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StackTrieNode *CurrentStack = &NodeStore.front();
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StacksByStackId[*id_counter - 1] = CurrentStack;
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ParentCallees.push_back(CurrentStack);
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return CurrentStack;
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}
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unsigned stack_id = siblings[0]->ExtraData.id;
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NodeStore.push_front({FuncId, Parent, {}, {stack_id, std::move(siblings)}});
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StackTrieNode *CurrentStack = &NodeStore.front();
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for (auto *sibling : CurrentStack->ExtraData.siblings)
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sibling->ExtraData.siblings.push_back(CurrentStack);
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ParentCallees.push_back(CurrentStack);
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return CurrentStack;
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}
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void writeTraceViewerRecord(uint16_t Version, raw_ostream &OS, int32_t FuncId,
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uint32_t TId, uint32_t PId, bool Symbolize,
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const FuncIdConversionHelper &FuncIdHelper,
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double EventTimestampUs,
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const StackTrieNode &StackCursor,
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StringRef FunctionPhenotype) {
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OS << " ";
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if (Version >= 3) {
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OS << llvm::formatv(
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R"({ "name" : "{0}", "ph" : "{1}", "tid" : "{2}", "pid" : "{3}", )"
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R"("ts" : "{4:f4}", "sf" : "{5}" })",
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(Symbolize ? FuncIdHelper.SymbolOrNumber(FuncId)
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: llvm::to_string(FuncId)),
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FunctionPhenotype, TId, PId, EventTimestampUs,
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StackCursor.ExtraData.id);
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} else {
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OS << llvm::formatv(
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R"({ "name" : "{0}", "ph" : "{1}", "tid" : "{2}", "pid" : "1", )"
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R"("ts" : "{3:f3}", "sf" : "{4}" })",
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(Symbolize ? FuncIdHelper.SymbolOrNumber(FuncId)
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: llvm::to_string(FuncId)),
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FunctionPhenotype, TId, EventTimestampUs, StackCursor.ExtraData.id);
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}
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}
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} // namespace
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void TraceConverter::exportAsChromeTraceEventFormat(const Trace &Records,
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raw_ostream &OS) {
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const auto &FH = Records.getFileHeader();
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auto Version = FH.Version;
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auto CycleFreq = FH.CycleFrequency;
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unsigned id_counter = 0;
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OS << "{\n \"traceEvents\": [";
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DenseMap<uint32_t, StackTrieNode *> StackCursorByThreadId{};
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DenseMap<uint32_t, SmallVector<StackTrieNode *, 4>> StackRootsByThreadId{};
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DenseMap<unsigned, StackTrieNode *> StacksByStackId{};
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std::forward_list<StackTrieNode> NodeStore{};
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int loop_count = 0;
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for (const auto &R : Records) {
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if (loop_count++ == 0)
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OS << "\n";
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else
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OS << ",\n";
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// Chrome trace event format always wants data in micros.
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// CyclesPerMicro = CycleHertz / 10^6
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// TSC / CyclesPerMicro == TSC * 10^6 / CycleHertz == MicroTimestamp
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// Could lose some precision here by converting the TSC to a double to
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// multiply by the period in micros. 52 bit mantissa is a good start though.
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// TODO: Make feature request to Chrome Trace viewer to accept ticks and a
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// frequency or do some more involved calculation to avoid dangers of
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// conversion.
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double EventTimestampUs = double(1000000) / CycleFreq * double(R.TSC);
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StackTrieNode *&StackCursor = StackCursorByThreadId[R.TId];
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switch (R.Type) {
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case RecordTypes::CUSTOM_EVENT:
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case RecordTypes::TYPED_EVENT:
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// TODO: Support typed and custom event rendering on Chrome Trace Viewer.
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break;
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case RecordTypes::ENTER:
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case RecordTypes::ENTER_ARG:
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StackCursor = findOrCreateStackNode(StackCursor, R.FuncId, R.TId,
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StackRootsByThreadId, StacksByStackId,
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&id_counter, NodeStore);
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// Each record is represented as a json dictionary with function name,
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// type of B for begin or E for end, thread id, process id,
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// timestamp in microseconds, and a stack frame id. The ids are logged
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// in an id dictionary after the events.
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writeTraceViewerRecord(Version, OS, R.FuncId, R.TId, R.PId, Symbolize,
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FuncIdHelper, EventTimestampUs, *StackCursor, "B");
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break;
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case RecordTypes::EXIT:
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case RecordTypes::TAIL_EXIT:
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// No entries to record end for.
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if (StackCursor == nullptr)
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break;
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// Should we emit an END record anyway or account this condition?
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// (And/Or in loop termination below)
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StackTrieNode *PreviousCursor = nullptr;
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do {
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if (PreviousCursor != nullptr) {
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OS << ",\n";
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}
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writeTraceViewerRecord(Version, OS, StackCursor->FuncId, R.TId, R.PId,
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Symbolize, FuncIdHelper, EventTimestampUs,
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*StackCursor, "E");
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PreviousCursor = StackCursor;
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StackCursor = StackCursor->Parent;
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} while (PreviousCursor->FuncId != R.FuncId && StackCursor != nullptr);
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break;
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}
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}
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OS << "\n ],\n"; // Close the Trace Events array.
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OS << " "
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<< "\"displayTimeUnit\": \"ns\",\n";
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// The stackFrames dictionary substantially reduces size of the output file by
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// avoiding repeating the entire call stack of function names for each entry.
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OS << R"( "stackFrames": {)";
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int stack_frame_count = 0;
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for (auto map_iter : StacksByStackId) {
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if (stack_frame_count++ == 0)
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OS << "\n";
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else
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OS << ",\n";
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OS << " ";
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OS << llvm::formatv(
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R"("{0}" : { "name" : "{1}")", map_iter.first,
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(Symbolize ? FuncIdHelper.SymbolOrNumber(map_iter.second->FuncId)
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: llvm::to_string(map_iter.second->FuncId)));
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if (map_iter.second->Parent != nullptr)
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OS << llvm::formatv(R"(, "parent": "{0}")",
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map_iter.second->Parent->ExtraData.id);
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OS << " }";
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}
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OS << "\n }\n"; // Close the stack frames map.
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OS << "}\n"; // Close the JSON entry.
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}
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namespace llvm {
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namespace xray {
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static CommandRegistration Unused(&Convert, []() -> Error {
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// FIXME: Support conversion to BINARY when upgrading XRay trace versions.
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InstrumentationMap Map;
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if (!ConvertInstrMap.empty()) {
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auto InstrumentationMapOrError = loadInstrumentationMap(ConvertInstrMap);
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if (!InstrumentationMapOrError)
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return joinErrors(make_error<StringError>(
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Twine("Cannot open instrumentation map '") +
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ConvertInstrMap + "'",
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std::make_error_code(std::errc::invalid_argument)),
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InstrumentationMapOrError.takeError());
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Map = std::move(*InstrumentationMapOrError);
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}
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const auto &FunctionAddresses = Map.getFunctionAddresses();
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symbolize::LLVMSymbolizer Symbolizer;
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llvm::xray::FuncIdConversionHelper FuncIdHelper(ConvertInstrMap, Symbolizer,
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FunctionAddresses);
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llvm::xray::TraceConverter TC(FuncIdHelper, ConvertSymbolize);
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std::error_code EC;
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raw_fd_ostream OS(ConvertOutput, EC,
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ConvertOutputFormat == ConvertFormats::BINARY
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? sys::fs::OpenFlags::OF_None
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: sys::fs::OpenFlags::OF_Text);
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if (EC)
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return make_error<StringError>(
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Twine("Cannot open file '") + ConvertOutput + "' for writing.", EC);
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auto TraceOrErr = loadTraceFile(ConvertInput, ConvertSortInput);
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if (!TraceOrErr)
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return joinErrors(
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make_error<StringError>(
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Twine("Failed loading input file '") + ConvertInput + "'.",
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std::make_error_code(std::errc::executable_format_error)),
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TraceOrErr.takeError());
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auto &T = *TraceOrErr;
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switch (ConvertOutputFormat) {
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case ConvertFormats::YAML:
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TC.exportAsYAML(T, OS);
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break;
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case ConvertFormats::BINARY:
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TC.exportAsRAWv1(T, OS);
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break;
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case ConvertFormats::CHROME_TRACE_EVENT:
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TC.exportAsChromeTraceEventFormat(T, OS);
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break;
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}
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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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