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llvm-project/llvm/tools/llvm-xray/xray-graph-diff.cpp

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//===-- xray-graph-diff.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 <cassert>
#include <cmath>
#include <limits>
#include <string>
#include "xray-graph-diff.h"
#include "xray-graph.h"
#include "xray-registry.h"
#include "xray-color-helper.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/XRay/Trace.h"
using namespace llvm;
using namespace xray;
static cl::SubCommand GraphDiff("graph-diff",
"Generate diff of function-call graphs");
static cl::opt<std::string> GraphDiffInput1(cl::Positional,
cl::desc("<xray log file 1>"),
cl::Required, cl::sub(GraphDiff));
static cl::opt<std::string> GraphDiffInput2(cl::Positional,
cl::desc("<xray log file 2>"),
cl::Required, cl::sub(GraphDiff));
static cl::opt<bool>
GraphDiffKeepGoing("keep-going",
cl::desc("Keep going on errors encountered"),
cl::sub(GraphDiff), cl::init(false));
static cl::alias GraphDiffKeepGoingA("k", cl::aliasopt(GraphDiffKeepGoing),
cl::desc("Alias for -keep-going"));
static cl::opt<bool>
GraphDiffKeepGoing1("keep-going-1",
cl::desc("Keep going on errors encountered in trace 1"),
cl::sub(GraphDiff), cl::init(false));
static cl::alias GraphDiffKeepGoing1A("k1", cl::aliasopt(GraphDiffKeepGoing1),
cl::desc("Alias for -keep-going-1"));
static cl::opt<bool>
GraphDiffKeepGoing2("keep-going-2",
cl::desc("Keep going on errors encountered in trace 2"),
cl::sub(GraphDiff), cl::init(false));
static cl::alias GraphDiffKeepGoing2A("k2", cl::aliasopt(GraphDiffKeepGoing2),
cl::desc("Alias for -keep-going-2"));
static cl::opt<std::string>
GraphDiffInstrMap("instr-map",
cl::desc("binary with the instrumentation map, or "
"a separate instrumentation map for graph"),
cl::value_desc("binary with xray_instr_map or yaml"),
cl::sub(GraphDiff), cl::init(""));
static cl::alias GraphDiffInstrMapA("m", cl::aliasopt(GraphDiffInstrMap),
cl::desc("Alias for -instr-map"));
static cl::opt<std::string>
GraphDiffInstrMap1("instr-map-1",
cl::desc("binary with the instrumentation map, or "
"a separate instrumentation map for graph 1"),
cl::value_desc("binary with xray_instr_map or yaml"),
cl::sub(GraphDiff), cl::init(""));
static cl::alias GraphDiffInstrMap1A("m1", cl::aliasopt(GraphDiffInstrMap1),
cl::desc("Alias for -instr-map-1"));
static cl::opt<std::string>
GraphDiffInstrMap2("instr-map-2",
cl::desc("binary with the instrumentation map, or "
"a separate instrumentation map for graph 2"),
cl::value_desc("binary with xray_instr_map or yaml"),
cl::sub(GraphDiff), cl::init(""));
static cl::alias GraphDiffInstrMap2A("m2", cl::aliasopt(GraphDiffInstrMap2),
cl::desc("Alias for -instr-map-2"));
static cl::opt<bool> GraphDiffDeduceSiblingCalls(
"deduce-sibling-calls",
cl::desc("Deduce sibling calls when unrolling function call stacks"),
cl::sub(GraphDiff), cl::init(false));
static cl::alias
GraphDiffDeduceSiblingCallsA("d", cl::aliasopt(GraphDiffDeduceSiblingCalls),
cl::desc("Alias for -deduce-sibling-calls"));
static cl::opt<bool> GraphDiffDeduceSiblingCalls1(
"deduce-sibling-calls-1",
cl::desc("Deduce sibling calls when unrolling function call stacks"),
cl::sub(GraphDiff), cl::init(false));
static cl::alias GraphDiffDeduceSiblingCalls1A(
"d1", cl::aliasopt(GraphDiffDeduceSiblingCalls1),
cl::desc("Alias for -deduce-sibling-calls-1"));
static cl::opt<bool> GraphDiffDeduceSiblingCalls2(
"deduce-sibling-calls-2",
cl::desc("Deduce sibling calls when unrolling function call stacks"),
cl::sub(GraphDiff), cl::init(false));
static cl::alias GraphDiffDeduceSiblingCalls2A(
"d2", cl::aliasopt(GraphDiffDeduceSiblingCalls2),
cl::desc("Alias for -deduce-sibling-calls-2"));
static cl::opt<GraphRenderer::StatType> GraphDiffEdgeLabel(
"edge-label", cl::desc("Output graphs with edges labeled with this field"),
cl::value_desc("field"), cl::sub(GraphDiff),
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 GraphDiffEdgeLabelA("e", cl::aliasopt(GraphDiffEdgeLabel),
cl::desc("Alias for -edge-label"));
static cl::opt<GraphRenderer::StatType> GraphDiffEdgeColor(
"edge-color", cl::desc("Output graphs with edges colored by this field"),
cl::value_desc("field"), cl::sub(GraphDiff),
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 GraphDiffEdgeColorA("c", cl::aliasopt(GraphDiffEdgeColor),
cl::desc("Alias for -edge-color"));
static cl::opt<GraphRenderer::StatType> GraphDiffVertexLabel(
"vertex-label",
cl::desc("Output graphs with vertices labeled with this field"),
cl::value_desc("field"), cl::sub(GraphDiff),
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 GraphDiffVertexLabelA("v", cl::aliasopt(GraphDiffVertexLabel),
cl::desc("Alias for -vertex-label"));
static cl::opt<GraphRenderer::StatType> GraphDiffVertexColor(
"vertex-color",
cl::desc("Output graphs with vertices colored by this field"),
cl::value_desc("field"), cl::sub(GraphDiff),
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 GraphDiffVertexColorA("b", cl::aliasopt(GraphDiffVertexColor),
cl::desc("Alias for -vertex-color"));
static cl::opt<int> GraphDiffVertexLabelTrunc(
"vertex-label-trun", cl::desc("What length to truncate vertex labels to "),
cl::sub(GraphDiff), cl::init(40));
static cl::alias
GraphDiffVertexLabelTrunc1("t", cl::aliasopt(GraphDiffVertexLabelTrunc),
cl::desc("Alias for -vertex-label-trun"));
static cl::opt<std::string>
GraphDiffOutput("output", cl::value_desc("Output file"), cl::init("-"),
cl::desc("output file; use '-' for stdout"),
cl::sub(GraphDiff));
static cl::alias GraphDiffOutputA("o", cl::aliasopt(GraphDiffOutput),
cl::desc("Alias for -output"));
Expected<GraphDiffRenderer> GraphDiffRenderer::Factory::getGraphDiffRenderer() {
GraphDiffRenderer R;
for (int i = 0; i < N; ++i) {
const auto &G = this->G[i].get();
for (const auto &V : G.vertices()) {
const auto &VAttr = V.second;
R.G[VAttr.SymbolName].CorrVertexPtr[i] = &V;
}
for (const auto &E : G.edges()) {
auto &EdgeTailID = E.first.first;
auto &EdgeHeadID = E.first.second;
auto EdgeTailAttrOrErr = G.at(EdgeTailID);
auto EdgeHeadAttrOrErr = G.at(EdgeHeadID);
if (!EdgeTailAttrOrErr)
return EdgeTailAttrOrErr.takeError();
if (!EdgeHeadAttrOrErr)
return EdgeHeadAttrOrErr.takeError();
GraphT::EdgeIdentifier ID{EdgeTailAttrOrErr->SymbolName,
EdgeHeadAttrOrErr->SymbolName};
R.G[ID].CorrEdgePtr[i] = &E;
}
}
return R;
}
// Returns the Relative change With respect to LeftStat between LeftStat
// and RightStat.
static double statRelDiff(const GraphDiffRenderer::TimeStat &LeftStat,
const GraphDiffRenderer::TimeStat &RightStat,
GraphDiffRenderer::StatType T) {
double LeftAttr = LeftStat.getDouble(T);
double RightAttr = RightStat.getDouble(T);
return RightAttr / LeftAttr - 1.0;
}
static std::string getColor(const GraphDiffRenderer::GraphT::EdgeValueType &E,
const GraphDiffRenderer::GraphT &G, ColorHelper H,
GraphDiffRenderer::StatType T) {
auto &EdgeAttr = E.second;
if (EdgeAttr.CorrEdgePtr[0] == nullptr)
return H.getColorString(2.0); // A number greater than 1.0
if (EdgeAttr.CorrEdgePtr[1] == nullptr)
return H.getColorString(-2.0); // A number less than -1.0
if (T == GraphDiffRenderer::StatType::NONE)
return H.getDefaultColorString();
const auto &LeftStat = EdgeAttr.CorrEdgePtr[0]->second.S;
const auto &RightStat = EdgeAttr.CorrEdgePtr[1]->second.S;
double RelDiff = statRelDiff(LeftStat, RightStat, T);
double CappedRelDiff = std::min(1.0, std::max(-1.0, RelDiff));
return H.getColorString(CappedRelDiff);
}
static std::string getColor(const GraphDiffRenderer::GraphT::VertexValueType &V,
const GraphDiffRenderer::GraphT &G, ColorHelper H,
GraphDiffRenderer::StatType T) {
auto &VertexAttr = V.second;
if (VertexAttr.CorrVertexPtr[0] == nullptr)
return H.getColorString(2.0); // A number greater than 1.0
if (VertexAttr.CorrVertexPtr[1] == nullptr)
return H.getColorString(-2.0); // A number less than -1.0
if (T == GraphDiffRenderer::StatType::NONE)
return H.getDefaultColorString();
const auto &LeftStat = VertexAttr.CorrVertexPtr[0]->second.S;
const auto &RightStat = VertexAttr.CorrVertexPtr[1]->second.S;
double RelDiff = statRelDiff(LeftStat, RightStat, T);
double CappedRelDiff = std::min(1.0, std::max(-1.0, RelDiff));
return H.getColorString(CappedRelDiff);
}
static Twine truncateString(const StringRef &S, size_t n) {
return (S.size() > n) ? Twine(S.substr(0, n)) + "..." : Twine(S);
}
template <typename T> static bool containsNullptr(const T &Collection) {
for (const auto &E : Collection)
if (E == nullptr)
return true;
return false;
}
static std::string getLabel(const GraphDiffRenderer::GraphT::EdgeValueType &E,
GraphDiffRenderer::StatType EL) {
auto &EdgeAttr = E.second;
switch (EL) {
case GraphDiffRenderer::StatType::NONE:
return "";
default:
if (containsNullptr(EdgeAttr.CorrEdgePtr))
return "";
const auto &LeftStat = EdgeAttr.CorrEdgePtr[0]->second.S;
const auto &RightStat = EdgeAttr.CorrEdgePtr[1]->second.S;
double RelDiff = statRelDiff(LeftStat, RightStat, EL);
return std::string(formatv(R"({0:P})", RelDiff));
}
}
static std::string getLabel(const GraphDiffRenderer::GraphT::VertexValueType &V,
GraphDiffRenderer::StatType VL, int TrunLen) {
const auto &VertexId = V.first;
const auto &VertexAttr = V.second;
switch (VL) {
case GraphDiffRenderer::StatType::NONE:
return std::string(
formatv(R"({0})", truncateString(VertexId, TrunLen).str()));
default:
if (containsNullptr(VertexAttr.CorrVertexPtr))
return std::string(
formatv(R"({0})", truncateString(VertexId, TrunLen).str()));
const auto &LeftStat = VertexAttr.CorrVertexPtr[0]->second.S;
const auto &RightStat = VertexAttr.CorrVertexPtr[1]->second.S;
double RelDiff = statRelDiff(LeftStat, RightStat, VL);
return std::string(formatv(
R"({{{0}|{1:P}})", truncateString(VertexId, TrunLen).str(), RelDiff));
}
}
static double getLineWidth(const GraphDiffRenderer::GraphT::EdgeValueType &E,
GraphDiffRenderer::StatType EL) {
auto &EdgeAttr = E.second;
switch (EL) {
case GraphDiffRenderer::StatType::NONE:
return 1.0;
default:
if (containsNullptr(EdgeAttr.CorrEdgePtr))
return 1.0;
const auto &LeftStat = EdgeAttr.CorrEdgePtr[0]->second.S;
const auto &RightStat = EdgeAttr.CorrEdgePtr[1]->second.S;
double RelDiff = statRelDiff(LeftStat, RightStat, EL);
return (RelDiff > 1.0) ? RelDiff : 1.0;
}
}
void GraphDiffRenderer::exportGraphAsDOT(raw_ostream &OS, StatType EdgeLabel,
StatType EdgeColor,
StatType VertexLabel,
StatType VertexColor, int TruncLen) {
// Get numbering of vertices for dot output.
StringMap<int32_t> VertexNo;
int i = 0;
for (const auto &V : G.vertices()) {
VertexNo[V.first] = i++;
}
ColorHelper H(ColorHelper::DivergingScheme::PiYG);
OS << "digraph xrayDiff {\n";
if (VertexLabel != StatType::NONE)
OS << "node [shape=record]\n";
for (const auto &E : G.edges()) {
const auto &HeadId = E.first.first;
const auto &TailId = E.first.second;
OS << formatv(R"(F{0} -> F{1} [tooltip="{2} -> {3}" label="{4}" )"
R"(color="{5}" labelfontcolor="{5}" penwidth={6}])"
"\n",
VertexNo[HeadId], VertexNo[TailId],
(HeadId.equals("")) ? static_cast<StringRef>("F0") : HeadId,
TailId, getLabel(E, EdgeLabel), getColor(E, G, H, EdgeColor),
getLineWidth(E, EdgeColor));
}
for (const auto &V : G.vertices()) {
const auto &VertexId = V.first;
if (VertexId.equals("")) {
OS << formatv(R"(F{0} [label="F0"])"
"\n",
VertexNo[VertexId]);
continue;
}
OS << formatv(R"(F{0} [label="{1}" color="{2}"])"
"\n",
VertexNo[VertexId], getLabel(V, VertexLabel, TruncLen),
getColor(V, G, H, VertexColor));
}
OS << "}\n";
}
template <typename T> static T &ifSpecified(T &A, cl::alias &AA, T &B) {
if (A.getPosition() == 0 && AA.getPosition() == 0)
return B;
return A;
}
static CommandRegistration Unused(&GraphDiff, []() -> Error {
std::array<GraphRenderer::Factory, 2> Factories{
{{ifSpecified(GraphDiffKeepGoing1, GraphDiffKeepGoing1A,
GraphDiffKeepGoing),
ifSpecified(GraphDiffDeduceSiblingCalls1, GraphDiffDeduceSiblingCalls1A,
GraphDiffDeduceSiblingCalls),
ifSpecified(GraphDiffInstrMap1, GraphDiffInstrMap1A, GraphDiffInstrMap),
Trace()},
{ifSpecified(GraphDiffKeepGoing2, GraphDiffKeepGoing2A,
GraphDiffKeepGoing),
ifSpecified(GraphDiffDeduceSiblingCalls2, GraphDiffDeduceSiblingCalls2A,
GraphDiffDeduceSiblingCalls),
ifSpecified(GraphDiffInstrMap2, GraphDiffInstrMap2A, GraphDiffInstrMap),
Trace()}}};
std::array<std::string, 2> Inputs{{GraphDiffInput1, GraphDiffInput2}};
std::array<GraphRenderer::GraphT, 2> Graphs;
for (int i = 0; i < 2; i++) {
auto TraceOrErr = loadTraceFile(Inputs[i], true);
if (!TraceOrErr)
return make_error<StringError>(
Twine("Failed Loading Input File '") + Inputs[i] + "'",
make_error_code(llvm::errc::invalid_argument));
Factories[i].Trace = std::move(*TraceOrErr);
auto GraphRendererOrErr = Factories[i].getGraphRenderer();
if (!GraphRendererOrErr)
return GraphRendererOrErr.takeError();
auto GraphRenderer = *GraphRendererOrErr;
Graphs[i] = GraphRenderer.getGraph();
}
GraphDiffRenderer::Factory DGF(Graphs[0], Graphs[1]);
auto GDROrErr = DGF.getGraphDiffRenderer();
if (!GDROrErr)
return GDROrErr.takeError();
auto &GDR = *GDROrErr;
std::error_code EC;
raw_fd_ostream OS(GraphDiffOutput, EC, sys::fs::OpenFlags::OF_Text);
if (EC)
return make_error<StringError>(
Twine("Cannot open file '") + GraphDiffOutput + "' for writing.", EC);
GDR.exportGraphAsDOT(OS, GraphDiffEdgeLabel, GraphDiffEdgeColor,
GraphDiffVertexLabel, GraphDiffVertexColor,
GraphDiffVertexLabelTrunc);
return Error::success();
});
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