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llvm-mirror/tools/llvm-xray/xray-graph.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===-- xray-graph.cpp: XRay Function Call Graph Renderer -----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Generate a DOT file to represent the function call graph encountered in
// the trace.
//
//===----------------------------------------------------------------------===//
#include "xray-graph.h"
#include "xray-registry.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/XRay/InstrumentationMap.h"
#include "llvm/XRay/Trace.h"
using namespace llvm;
using namespace llvm::xray;
// Setup llvm-xray graph subcommand and its options.
static cl::SubCommand GraphC("graph", "Generate function-call graph");
static cl::opt<std::string> GraphInput(cl::Positional,
cl::desc("<xray log file>"),
cl::Required, cl::sub(GraphC));
static cl::opt<bool>
GraphKeepGoing("keep-going", cl::desc("Keep going on errors encountered"),
cl::sub(GraphC), cl::init(false));
static cl::alias GraphKeepGoing2("k", cl::aliasopt(GraphKeepGoing),
cl::desc("Alias for -keep-going"),
cl::sub(GraphC));
static cl::opt<std::string>
GraphOutput("output", cl::value_desc("Output file"), cl::init("-"),
cl::desc("output file; use '-' for stdout"), cl::sub(GraphC));
static cl::alias GraphOutput2("o", cl::aliasopt(GraphOutput),
cl::desc("Alias for -output"), cl::sub(GraphC));
static cl::opt<std::string>
GraphInstrMap("instr_map",
cl::desc("binary with the instrumrntation map, or "
"a separate instrumentation map"),
cl::value_desc("binary with xray_instr_map"), cl::sub(GraphC),
cl::init(""));
static cl::alias GraphInstrMap2("m", cl::aliasopt(GraphInstrMap),
cl::desc("alias for -instr_map"),
cl::sub(GraphC));
static cl::opt<bool> GraphDeduceSiblingCalls(
"deduce-sibling-calls",
cl::desc("Deduce sibling calls when unrolling function call stacks"),
cl::sub(GraphC), cl::init(false));
static cl::alias
GraphDeduceSiblingCalls2("d", cl::aliasopt(GraphDeduceSiblingCalls),
cl::desc("Alias for -deduce-sibling-calls"),
cl::sub(GraphC));
static cl::opt<GraphRenderer::StatType>
GraphEdgeLabel("edge-label",
cl::desc("Output graphs with edges labeled with this field"),
cl::value_desc("field"), cl::sub(GraphC),
cl::init(GraphRenderer::StatType::NONE),
cl::values(clEnumValN(GraphRenderer::StatType::NONE, "none",
"Do not label Edges"),
clEnumValN(GraphRenderer::StatType::COUNT,
"count", "function call counts"),
clEnumValN(GraphRenderer::StatType::MIN, "min",
"minimum function durations"),
clEnumValN(GraphRenderer::StatType::MED, "med",
"median function durations"),
clEnumValN(GraphRenderer::StatType::PCT90, "90p",
"90th percentile durations"),
clEnumValN(GraphRenderer::StatType::PCT99, "99p",
"99th percentile durations"),
clEnumValN(GraphRenderer::StatType::MAX, "max",
"maximum function durations"),
clEnumValN(GraphRenderer::StatType::SUM, "sum",
"sum of call durations")));
static cl::alias GraphEdgeLabel2("e", cl::aliasopt(GraphEdgeLabel),
cl::desc("Alias for -edge-label"),
cl::sub(GraphC));
static cl::opt<GraphRenderer::StatType> GraphVertexLabel(
"vertex-label",
cl::desc("Output graphs with vertices labeled with this field"),
cl::value_desc("field"), cl::sub(GraphC),
cl::init(GraphRenderer::StatType::NONE),
cl::values(clEnumValN(GraphRenderer::StatType::NONE, "none",
"Do not label Vertices"),
clEnumValN(GraphRenderer::StatType::COUNT, "count",
"function call counts"),
clEnumValN(GraphRenderer::StatType::MIN, "min",
"minimum function durations"),
clEnumValN(GraphRenderer::StatType::MED, "med",
"median function durations"),
clEnumValN(GraphRenderer::StatType::PCT90, "90p",
"90th percentile durations"),
clEnumValN(GraphRenderer::StatType::PCT99, "99p",
"99th percentile durations"),
clEnumValN(GraphRenderer::StatType::MAX, "max",
"maximum function durations"),
clEnumValN(GraphRenderer::StatType::SUM, "sum",
"sum of call durations")));
static cl::alias GraphVertexLabel2("v", cl::aliasopt(GraphVertexLabel),
cl::desc("Alias for -edge-label"),
cl::sub(GraphC));
static cl::opt<GraphRenderer::StatType> GraphEdgeColorType(
"color-edges",
cl::desc("Output graphs with edge colors determined by this field"),
cl::value_desc("field"), cl::sub(GraphC),
cl::init(GraphRenderer::StatType::NONE),
cl::values(clEnumValN(GraphRenderer::StatType::NONE, "none",
"Do not color Edges"),
clEnumValN(GraphRenderer::StatType::COUNT, "count",
"function call counts"),
clEnumValN(GraphRenderer::StatType::MIN, "min",
"minimum function durations"),
clEnumValN(GraphRenderer::StatType::MED, "med",
"median function durations"),
clEnumValN(GraphRenderer::StatType::PCT90, "90p",
"90th percentile durations"),
clEnumValN(GraphRenderer::StatType::PCT99, "99p",
"99th percentile durations"),
clEnumValN(GraphRenderer::StatType::MAX, "max",
"maximum function durations"),
clEnumValN(GraphRenderer::StatType::SUM, "sum",
"sum of call durations")));
static cl::alias GraphEdgeColorType2("c", cl::aliasopt(GraphEdgeColorType),
cl::desc("Alias for -color-edges"),
cl::sub(GraphC));
static cl::opt<GraphRenderer::StatType> GraphVertexColorType(
"color-vertices",
cl::desc("Output graphs with vertex colors determined by this field"),
cl::value_desc("field"), cl::sub(GraphC),
cl::init(GraphRenderer::StatType::NONE),
cl::values(clEnumValN(GraphRenderer::StatType::NONE, "none",
"Do not color vertices"),
clEnumValN(GraphRenderer::StatType::COUNT, "count",
"function call counts"),
clEnumValN(GraphRenderer::StatType::MIN, "min",
"minimum function durations"),
clEnumValN(GraphRenderer::StatType::MED, "med",
"median function durations"),
clEnumValN(GraphRenderer::StatType::PCT90, "90p",
"90th percentile durations"),
clEnumValN(GraphRenderer::StatType::PCT99, "99p",
"99th percentile durations"),
clEnumValN(GraphRenderer::StatType::MAX, "max",
"maximum function durations"),
clEnumValN(GraphRenderer::StatType::SUM, "sum",
"sum of call durations")));
static cl::alias GraphVertexColorType2("b", cl::aliasopt(GraphVertexColorType),
cl::desc("Alias for -edge-label"),
cl::sub(GraphC));
template <class T> T diff(T L, T R) { return std::max(L, R) - std::min(L, R); }
// Updates the statistics for a GraphRenderer::TimeStat
static void updateStat(GraphRenderer::TimeStat &S, int64_t L) {
S.Count++;
if (S.Min > L || S.Min == 0)
S.Min = L;
if (S.Max < L)
S.Max = L;
S.Sum += L;
}
// Evaluates an XRay record and performs accounting on it.
//
// If the record is an ENTER record it pushes the FuncID and TSC onto a
// structure representing the call stack for that function.
// If the record is an EXIT record it checks computes computes the ammount of
// time the function took to complete and then stores that information in an
// edge of the graph. If there is no matching ENTER record the function tries
// to recover by assuming that there were EXIT records which were missed, for
// example caused by tail call elimination and if the option is enabled then
// then tries to recover from this.
//
// This funciton will also error if the records are out of order, as the trace
// is expected to be sorted.
//
// The graph generated has an immaginary root for functions called by no-one at
// FuncId 0.
//
// FIXME: Refactor this and account subcommand to reduce code duplication.
Error GraphRenderer::accountRecord(const XRayRecord &Record) {
using std::make_error_code;
using std::errc;
if (CurrentMaxTSC == 0)
CurrentMaxTSC = Record.TSC;
if (Record.TSC < CurrentMaxTSC)
return make_error<StringError>("Records not in order",
make_error_code(errc::invalid_argument));
auto &ThreadStack = PerThreadFunctionStack[Record.TId];
switch (Record.Type) {
case RecordTypes::ENTER:
case RecordTypes::ENTER_ARG: {
if (Record.FuncId != 0 && G.count(Record.FuncId) == 0)
G[Record.FuncId].SymbolName = FuncIdHelper.SymbolOrNumber(Record.FuncId);
ThreadStack.push_back({Record.FuncId, Record.TSC});
break;
}
case RecordTypes::EXIT:
case RecordTypes::TAIL_EXIT: {
// FIXME: Refactor this and the account subcommand to reduce code
// duplication
if (ThreadStack.size() == 0 || ThreadStack.back().FuncId != Record.FuncId) {
if (!DeduceSiblingCalls)
return make_error<StringError>("No matching ENTRY record",
make_error_code(errc::invalid_argument));
auto Parent = std::find_if(
ThreadStack.rbegin(), ThreadStack.rend(),
[&](const FunctionAttr &A) { return A.FuncId == Record.FuncId; });
if (Parent == ThreadStack.rend())
return make_error<StringError>(
"No matching Entry record in stack",
make_error_code(errc::invalid_argument)); // There is no matching
// Function for this exit.
while (ThreadStack.back().FuncId != Record.FuncId) {
TimestampT D = diff(ThreadStack.back().TSC, Record.TSC);
VertexIdentifier TopFuncId = ThreadStack.back().FuncId;
ThreadStack.pop_back();
assert(ThreadStack.size() != 0);
EdgeIdentifier EI(ThreadStack.back().FuncId, TopFuncId);
auto &EA = G[EI];
EA.Timings.push_back(D);
updateStat(EA.S, D);
updateStat(G[TopFuncId].S, D);
}
}
uint64_t D = diff(ThreadStack.back().TSC, Record.TSC);
ThreadStack.pop_back();
VertexIdentifier VI = ThreadStack.empty() ? 0 : ThreadStack.back().FuncId;
EdgeIdentifier EI(VI, Record.FuncId);
auto &EA = G[EI];
EA.Timings.push_back(D);
updateStat(EA.S, D);
updateStat(G[Record.FuncId].S, D);
break;
}
case RecordTypes::CUSTOM_EVENT:
case RecordTypes::TYPED_EVENT:
// TODO: Support custom and typed events in the graph processing?
break;
}
return Error::success();
}
template <typename U>
void GraphRenderer::getStats(U begin, U end, GraphRenderer::TimeStat &S) {
if (begin == end) return;
std::ptrdiff_t MedianOff = S.Count / 2;
std::nth_element(begin, begin + MedianOff, end);
S.Median = *(begin + MedianOff);
std::ptrdiff_t Pct90Off = (S.Count * 9) / 10;
std::nth_element(begin, begin + Pct90Off, end);
S.Pct90 = *(begin + Pct90Off);
std::ptrdiff_t Pct99Off = (S.Count * 99) / 100;
std::nth_element(begin, begin + Pct99Off, end);
S.Pct99 = *(begin + Pct99Off);
}
void GraphRenderer::updateMaxStats(const GraphRenderer::TimeStat &S,
GraphRenderer::TimeStat &M) {
M.Count = std::max(M.Count, S.Count);
M.Min = std::max(M.Min, S.Min);
M.Median = std::max(M.Median, S.Median);
M.Pct90 = std::max(M.Pct90, S.Pct90);
M.Pct99 = std::max(M.Pct99, S.Pct99);
M.Max = std::max(M.Max, S.Max);
M.Sum = std::max(M.Sum, S.Sum);
}
void GraphRenderer::calculateEdgeStatistics() {
assert(!G.edges().empty());
for (auto &E : G.edges()) {
auto &A = E.second;
assert(!A.Timings.empty());
getStats(A.Timings.begin(), A.Timings.end(), A.S);
updateMaxStats(A.S, G.GraphEdgeMax);
}
}
void GraphRenderer::calculateVertexStatistics() {
std::vector<uint64_t> TempTimings;
for (auto &V : G.vertices()) {
if (V.first != 0) {
for (auto &E : G.inEdges(V.first)) {
auto &A = E.second;
TempTimings.insert(TempTimings.end(), A.Timings.begin(),
A.Timings.end());
}
getStats(TempTimings.begin(), TempTimings.end(), G[V.first].S);
updateMaxStats(G[V.first].S, G.GraphVertexMax);
TempTimings.clear();
}
}
}
// A Helper function for normalizeStatistics which normalises a single
// TimeStat element.
static void normalizeTimeStat(GraphRenderer::TimeStat &S,
double CycleFrequency) {
int64_t OldCount = S.Count;
S = S / CycleFrequency;
S.Count = OldCount;
}
// Normalises the statistics in the graph for a given TSC frequency.
void GraphRenderer::normalizeStatistics(double CycleFrequency) {
for (auto &E : G.edges()) {
auto &S = E.second.S;
normalizeTimeStat(S, CycleFrequency);
}
for (auto &V : G.vertices()) {
auto &S = V.second.S;
normalizeTimeStat(S, CycleFrequency);
}
normalizeTimeStat(G.GraphEdgeMax, CycleFrequency);
normalizeTimeStat(G.GraphVertexMax, CycleFrequency);
}
// Returns a string containing the value of statistic field T
std::string
GraphRenderer::TimeStat::getString(GraphRenderer::StatType T) const {
std::string St;
raw_string_ostream S{St};
double TimeStat::*DoubleStatPtrs[] = {&TimeStat::Min, &TimeStat::Median,
&TimeStat::Pct90, &TimeStat::Pct99,
&TimeStat::Max, &TimeStat::Sum};
switch (T) {
case GraphRenderer::StatType::NONE:
break;
case GraphRenderer::StatType::COUNT:
S << Count;
break;
default:
S << (*this).*
DoubleStatPtrs[static_cast<int>(T) -
static_cast<int>(GraphRenderer::StatType::MIN)];
break;
}
return S.str();
}
// Returns the quotient between the property T of this and another TimeStat as
// a double
double GraphRenderer::TimeStat::getDouble(StatType T) const {
double retval = 0;
double TimeStat::*DoubleStatPtrs[] = {&TimeStat::Min, &TimeStat::Median,
&TimeStat::Pct90, &TimeStat::Pct99,
&TimeStat::Max, &TimeStat::Sum};
switch (T) {
case GraphRenderer::StatType::NONE:
retval = 0.0;
break;
case GraphRenderer::StatType::COUNT:
retval = static_cast<double>(Count);
break;
default:
retval =
(*this).*DoubleStatPtrs[static_cast<int>(T) -
static_cast<int>(GraphRenderer::StatType::MIN)];
break;
}
return retval;
}
// Outputs a DOT format version of the Graph embedded in the GraphRenderer
// object on OS. It does this in the expected way by itterating
// through all edges then vertices and then outputting them and their
// annotations.
//
// FIXME: output more information, better presented.
void GraphRenderer::exportGraphAsDOT(raw_ostream &OS, StatType ET, StatType EC,
StatType VT, StatType VC) {
OS << "digraph xray {\n";
if (VT != StatType::NONE)
OS << "node [shape=record];\n";
for (const auto &E : G.edges()) {
const auto &S = E.second.S;
OS << "F" << E.first.first << " -> "
<< "F" << E.first.second << " [label=\"" << S.getString(ET) << "\"";
if (EC != StatType::NONE)
OS << " color=\""
<< CHelper.getColorString(
std::sqrt(S.getDouble(EC) / G.GraphEdgeMax.getDouble(EC)))
<< "\"";
OS << "];\n";
}
for (const auto &V : G.vertices()) {
const auto &VA = V.second;
if (V.first == 0)
continue;
OS << "F" << V.first << " [label=\"" << (VT != StatType::NONE ? "{" : "")
<< (VA.SymbolName.size() > 40 ? VA.SymbolName.substr(0, 40) + "..."
: VA.SymbolName);
if (VT != StatType::NONE)
OS << "|" << VA.S.getString(VT) << "}\"";
else
OS << "\"";
if (VC != StatType::NONE)
OS << " color=\""
<< CHelper.getColorString(
std::sqrt(VA.S.getDouble(VC) / G.GraphVertexMax.getDouble(VC)))
<< "\"";
OS << "];\n";
}
OS << "}\n";
}
Expected<GraphRenderer> GraphRenderer::Factory::getGraphRenderer() {
InstrumentationMap Map;
if (!GraphInstrMap.empty()) {
auto InstrumentationMapOrError = loadInstrumentationMap(GraphInstrMap);
if (!InstrumentationMapOrError)
return joinErrors(
make_error<StringError>(
Twine("Cannot open instrumentation map '") + GraphInstrMap + "'",
std::make_error_code(std::errc::invalid_argument)),
InstrumentationMapOrError.takeError());
Map = std::move(*InstrumentationMapOrError);
}
const auto &FunctionAddresses = Map.getFunctionAddresses();
symbolize::LLVMSymbolizer::Options Opts(
symbolize::FunctionNameKind::LinkageName, true, true, false, "");
symbolize::LLVMSymbolizer Symbolizer(Opts);
const auto &Header = Trace.getFileHeader();
llvm::xray::FuncIdConversionHelper FuncIdHelper(InstrMap, Symbolizer,
FunctionAddresses);
xray::GraphRenderer GR(FuncIdHelper, DeduceSiblingCalls);
for (const auto &Record : Trace) {
auto E = GR.accountRecord(Record);
if (!E)
continue;
for (const auto &ThreadStack : GR.getPerThreadFunctionStack()) {
errs() << "Thread ID: " << ThreadStack.first << "\n";
auto Level = ThreadStack.second.size();
for (const auto &Entry : llvm::reverse(ThreadStack.second))
errs() << "#" << Level-- << "\t"
<< FuncIdHelper.SymbolOrNumber(Entry.FuncId) << '\n';
}
if (!GraphKeepGoing)
return joinErrors(make_error<StringError>(
"Error encountered generating the call graph.",
std::make_error_code(std::errc::invalid_argument)),
std::move(E));
handleAllErrors(std::move(E),
[&](const ErrorInfoBase &E) { E.log(errs()); });
}
GR.G.GraphEdgeMax = {};
GR.G.GraphVertexMax = {};
GR.calculateEdgeStatistics();
GR.calculateVertexStatistics();
if (Header.CycleFrequency)
GR.normalizeStatistics(Header.CycleFrequency);
return GR;
}
// Here we register and implement the llvm-xray graph subcommand.
// The bulk of this code reads in the options, opens the required files, uses
// those files to create a context for analysing the xray trace, then there is a
// short loop which actually analyses the trace, generates the graph and then
// outputs it as a DOT.
//
// FIXME: include additional filtering and annalysis passes to provide more
// specific useful information.
static CommandRegistration Unused(&GraphC, []() -> Error {
GraphRenderer::Factory F;
F.KeepGoing = GraphKeepGoing;
F.DeduceSiblingCalls = GraphDeduceSiblingCalls;
F.InstrMap = GraphInstrMap;
auto TraceOrErr = loadTraceFile(GraphInput, true);
if (!TraceOrErr)
return make_error<StringError>(
Twine("Failed loading input file '") + GraphInput + "'",
make_error_code(llvm::errc::invalid_argument));
F.Trace = std::move(*TraceOrErr);
auto GROrError = F.getGraphRenderer();
if (!GROrError)
return GROrError.takeError();
auto &GR = *GROrError;
std::error_code EC;
raw_fd_ostream OS(GraphOutput, EC, sys::fs::OpenFlags::F_Text);
if (EC)
return make_error<StringError>(
Twine("Cannot open file '") + GraphOutput + "' for writing.", EC);
GR.exportGraphAsDOT(OS, GraphEdgeLabel, GraphEdgeColorType, GraphVertexLabel,
GraphVertexColorType);
return Error::success();
});
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