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llvm-mirror/tools/llvm-xray/xray-graph-diff.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-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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"), cl::sub(GraphDiff));
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"), cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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"),
cl::sub(GraphDiff));
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 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 formatv(R"({0})", truncateString(VertexId, TrunLen).str());
default:
if (containsNullptr(VertexAttr.CorrVertexPtr))
return 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 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::F_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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