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llvm/tools/llvm-xray/xray-graph.cc
Dean Michael Berris 365612c08f [XRay][tools] Remove some assertions in llvm-xray graph 
Summary:
Assertions assuming that function calls may not have zero durations do
not seem to hold in the wild. There are valid cases where the conversion
of the tsc counters end up becoming zero-length durations. These
assertions don't really hold and the algorithms don't need those to be
true for them to work.

Reviewers: dblaikie, echristo

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31519

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299150 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-31 01:56:45 +00:00

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//===-- xray-graph.cc - XRay Function Call Graph Renderer -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Generate a DOT file to represent the function call graph encountered in
// the trace.
//
//===----------------------------------------------------------------------===//
#include <algorithm>
#include <cassert>
#include <cmath>
#include <system_error>
#include <utility>
#include "xray-graph.h"
#include "xray-registry.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/XRay/InstrumentationMap.h"
#include "llvm/XRay/Trace.h"
#include "llvm/XRay/YAMLXRayRecord.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 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 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 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 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 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 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: {
if (G.count(Record.FuncId) == 0)
G[Record.FuncId].SymbolName = FuncIdHelper.SymbolOrNumber(Record.FuncId);
ThreadStack.push_back({Record.FuncId, Record.TSC});
break;
}
case RecordTypes::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;
}
}
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) {
S.Min /= CycleFrequency;
S.Median /= CycleFrequency;
S.Max /= CycleFrequency;
S.Sum /= CycleFrequency;
S.Pct90 /= CycleFrequency;
S.Pct99 /= CycleFrequency;
}
// 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::getAsString(GraphRenderer::StatType T) const {
std::string St;
raw_string_ostream S{St};
switch (T) {
case GraphRenderer::StatType::COUNT:
S << Count;
break;
case GraphRenderer::StatType::MIN:
S << Min;
break;
case GraphRenderer::StatType::MED:
S << Median;
break;
case GraphRenderer::StatType::PCT90:
S << Pct90;
break;
case GraphRenderer::StatType::PCT99:
S << Pct99;
break;
case GraphRenderer::StatType::MAX:
S << Max;
break;
case GraphRenderer::StatType::SUM:
S << Sum;
break;
case GraphRenderer::StatType::NONE:
break;
}
return S.str();
}
// Returns the quotient between the property T of this and another TimeStat as
// a double
double GraphRenderer::TimeStat::compare(StatType T, const TimeStat &O) const {
double retval = 0;
switch (T) {
case GraphRenderer::StatType::COUNT:
retval = static_cast<double>(Count) / static_cast<double>(O.Count);
break;
case GraphRenderer::StatType::MIN:
retval = Min / O.Min;
break;
case GraphRenderer::StatType::MED:
retval = Median / O.Median;
break;
case GraphRenderer::StatType::PCT90:
retval = Pct90 / O.Pct90;
break;
case GraphRenderer::StatType::PCT99:
retval = Pct99 / O.Pct99;
break;
case GraphRenderer::StatType::MAX:
retval = Max / O.Max;
break;
case GraphRenderer::StatType::SUM:
retval = Sum / O.Sum;
break;
case GraphRenderer::StatType::NONE:
retval = 0.0;
break;
}
return std::sqrt(
retval); // the square root here provides more dynamic contrast for
// low runtime edges, giving better separation and
// coloring lower down the call stack.
}
// 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, const XRayFileHeader &H,
StatType ET, StatType EC, StatType VT,
StatType VC) {
G.GraphEdgeMax = {};
G.GraphVertexMax = {};
calculateEdgeStatistics();
calculateVertexStatistics();
if (H.CycleFrequency)
normalizeStatistics(H.CycleFrequency);
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.getAsString(ET) << "\"";
if (EC != StatType::NONE)
OS << " color=\"" << CHelper.getColorString(S.compare(EC, G.GraphEdgeMax))
<< "\"";
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.getAsString(VT) << "}\"";
else
OS << "\"";
if (VC != StatType::NONE)
OS << " color=\"" << CHelper.getColorString(VA.S.compare(VC, G.GraphVertexMax))
<< "\"";
OS << "];\n";
}
OS << "}\n";
}
// 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 {
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);
llvm::xray::FuncIdConversionHelper FuncIdHelper(GraphInstrMap, Symbolizer,
FunctionAddresses);
xray::GraphRenderer GR(FuncIdHelper, GraphDeduceSiblingCalls);
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);
auto TraceOrErr = loadTraceFile(GraphInput, true);
if (!TraceOrErr)
return joinErrors(
make_error<StringError>(Twine("Failed loading input file '") +
GraphInput + "'",
make_error_code(llvm::errc::invalid_argument)),
TraceOrErr.takeError());
auto &Trace = *TraceOrErr;
const auto &Header = Trace.getFileHeader();
// Here we generate the call graph from entries we find in the trace.
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.exportGraphAsDOT(OS, Header, GraphEdgeLabel, GraphEdgeColorType,
GraphVertexLabel, GraphVertexColorType);
return Error::success();
});
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