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//===-- TimeProfiler.cpp - Hierarchical Time Profiler ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file Hierarchical time profiler implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/TimeProfiler.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/FileSystem.h"
#include <cassert>
#include <chrono>
#include <string>
#include <unordered_map>
#include <vector>
using namespace std::chrono;
namespace llvm {
TimeTraceProfiler *TimeTraceProfilerInstance = nullptr;
static std::string escapeString(StringRef Src) {
std::string OS;
for (const unsigned char &C : Src) {
switch (C) {
case '"':
case '/':
case '\\':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
OS += '\\';
OS += C;
break;
default:
if (isPrint(C)) {
OS += C;
}
}
}
return OS;
}
typedef duration<steady_clock::rep, steady_clock::period> DurationType;
typedef std::pair<size_t, DurationType> CountAndDurationType;
typedef std::pair<std::string, CountAndDurationType>
NameAndCountAndDurationType;
struct Entry {
time_point<steady_clock> Start;
DurationType Duration;
std::string Name;
std::string Detail;
};
struct TimeTraceProfiler {
TimeTraceProfiler() {
Stack.reserve(8);
Entries.reserve(128);
StartTime = steady_clock::now();
}
void begin(std::string Name, llvm::function_ref<std::string()> Detail) {
Entry E = {steady_clock::now(), {}, Name, Detail()};
Stack.push_back(std::move(E));
}
void end() {
assert(!Stack.empty() && "Must call begin() first");
auto &E = Stack.back();
E.Duration = steady_clock::now() - E.Start;
// Only include sections longer than 500us.
if (duration_cast<microseconds>(E.Duration).count() > 500)
Entries.emplace_back(E);
// Track total time taken by each "name", but only the topmost levels of
// them; e.g. if there's a template instantiation that instantiates other
// templates from within, we only want to add the topmost one. "topmost"
// happens to be the ones that don't have any currently open entries above
// itself.
if (std::find_if(++Stack.rbegin(), Stack.rend(), [&](const Entry &Val) {
return Val.Name == E.Name;
}) == Stack.rend()) {
auto &CountAndTotal = CountAndTotalPerName[E.Name];
CountAndTotal.first++;
CountAndTotal.second += E.Duration;
}
Stack.pop_back();
}
void Write(std::unique_ptr<raw_pwrite_stream> &OS) {
assert(Stack.empty() &&
"All profiler sections should be ended when calling Write");
*OS << "{ \"traceEvents\": [\n";
// Emit all events for the main flame graph.
for (const auto &E : Entries) {
auto StartUs = duration_cast<microseconds>(E.Start - StartTime).count();
auto DurUs = duration_cast<microseconds>(E.Duration).count();
*OS << "{ \"pid\":1, \"tid\":0, \"ph\":\"X\", \"ts\":" << StartUs
<< ", \"dur\":" << DurUs << ", \"name\":\"" << escapeString(E.Name)
<< "\", \"args\":{ \"detail\":\"" << escapeString(E.Detail)
<< "\"} },\n";
}
// Emit totals by section name as additional "thread" events, sorted from
// longest one.
int Tid = 1;
std::vector<NameAndCountAndDurationType> SortedTotals;
SortedTotals.reserve(CountAndTotalPerName.size());
for (const auto &E : CountAndTotalPerName) {
SortedTotals.emplace_back(E.getKey(), E.getValue());
}
std::sort(SortedTotals.begin(), SortedTotals.end(),
[](const NameAndCountAndDurationType &A,
const NameAndCountAndDurationType &B) {
return A.second.second > B.second.second;
});
for (const auto &E : SortedTotals) {
auto DurUs = duration_cast<microseconds>(E.second.second).count();
auto Count = CountAndTotalPerName[E.first].first;
*OS << "{ \"pid\":1, \"tid\":" << Tid << ", \"ph\":\"X\", \"ts\":" << 0
<< ", \"dur\":" << DurUs << ", \"name\":\"Total "
<< escapeString(E.first) << "\", \"args\":{ \"count\":" << Count
<< ", \"avg ms\":" << (DurUs / Count / 1000) << "} },\n";
++Tid;
}
// Emit metadata event with process name.
*OS << "{ \"cat\":\"\", \"pid\":1, \"tid\":0, \"ts\":0, \"ph\":\"M\", "
"\"name\":\"process_name\", \"args\":{ \"name\":\"clang\" } }\n";
*OS << "] }\n";
}
std::vector<Entry> Stack;
std::vector<Entry> Entries;
StringMap<CountAndDurationType> CountAndTotalPerName;
time_point<steady_clock> StartTime;
};
void timeTraceProfilerInitialize() {
assert(TimeTraceProfilerInstance == nullptr &&
"Profiler should not be initialized");
TimeTraceProfilerInstance = new TimeTraceProfiler();
}
void timeTraceProfilerCleanup() {
delete TimeTraceProfilerInstance;
TimeTraceProfilerInstance = nullptr;
}
void timeTraceProfilerWrite(std::unique_ptr<raw_pwrite_stream> &OS) {
assert(TimeTraceProfilerInstance != nullptr &&
"Profiler object can't be null");
TimeTraceProfilerInstance->Write(OS);
}
void timeTraceProfilerBegin(StringRef Name, StringRef Detail) {
if (TimeTraceProfilerInstance != nullptr)
TimeTraceProfilerInstance->begin(Name, [&]() { return Detail; });
}
void timeTraceProfilerBegin(StringRef Name,
llvm::function_ref<std::string()> Detail) {
if (TimeTraceProfilerInstance != nullptr)
TimeTraceProfilerInstance->begin(Name, Detail);
}
void timeTraceProfilerEnd() {
if (TimeTraceProfilerInstance != nullptr)
TimeTraceProfilerInstance->end();
}
} // namespace llvm
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