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//===-- ImportedFunctionsInliningStats.cpp ----------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
// Generating inliner statistics for imported functions, mostly useful for
// ThinLTO.
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Utils/ImportedFunctionsInliningStatistics.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <iomanip>
#include <sstream>
#include <string>
using namespace llvm;
cl::opt<InlinerFunctionImportStatsOpts> InlinerFunctionImportStats(
"inliner-function-import-stats",
cl::init(InlinerFunctionImportStatsOpts::No),
cl::values(clEnumValN(InlinerFunctionImportStatsOpts::Basic, "basic",
"basic statistics"),
clEnumValN(InlinerFunctionImportStatsOpts::Verbose, "verbose",
"printing of statistics for each inlined function")),
cl::Hidden, cl::desc("Enable inliner stats for imported functions"));
ImportedFunctionsInliningStatistics::InlineGraphNode &
ImportedFunctionsInliningStatistics::createInlineGraphNode(const Function &F) {
auto &ValueLookup = NodesMap[F.getName()];
if (!ValueLookup) {
ValueLookup = std::make_unique<InlineGraphNode>();
ValueLookup->Imported = F.hasMetadata("thinlto_src_module");
}
return *ValueLookup;
}
void ImportedFunctionsInliningStatistics::recordInline(const Function &Caller,
const Function &Callee) {
InlineGraphNode &CallerNode = createInlineGraphNode(Caller);
InlineGraphNode &CalleeNode = createInlineGraphNode(Callee);
CalleeNode.NumberOfInlines++;
if (!CallerNode.Imported && !CalleeNode.Imported) {
// Direct inline from not imported callee to not imported caller, so we
// don't have to add this to graph. It might be very helpful if you wanna
// get the inliner statistics in compile step where there are no imported
// functions. In this case the graph would be empty.
CalleeNode.NumberOfRealInlines++;
return;
}
CallerNode.InlinedCallees.push_back(&CalleeNode);
if (!CallerNode.Imported) {
// We could avoid second lookup, but it would make the code ultra ugly.
auto It = NodesMap.find(Caller.getName());
assert(It != NodesMap.end() && "The node should be already there.");
// Save Caller as a starting node for traversal. The string has to be one
// from map because Caller can disappear (and function name with it).
NonImportedCallers.push_back(It->first());
}
}
void ImportedFunctionsInliningStatistics::setModuleInfo(const Module &M) {
ModuleName = M.getName();
for (const auto &F : M.functions()) {
if (F.isDeclaration())
continue;
AllFunctions++;
ImportedFunctions += int(F.hasMetadata("thinlto_src_module"));
}
}
static std::string getStatString(const char *Msg, int32_t Fraction, int32_t All,
const char *PercentageOfMsg,
bool LineEnd = true) {
double Result = 0;
if (All != 0)
Result = 100 * static_cast<double>(Fraction) / All;
std::stringstream Str;
Str << std::setprecision(4) << Msg << ": " << Fraction << " [" << Result
<< "% of " << PercentageOfMsg << "]";
if (LineEnd)
Str << "\n";
return Str.str();
}
void ImportedFunctionsInliningStatistics::dump(const bool Verbose) {
calculateRealInlines();
NonImportedCallers.clear();
int32_t InlinedImportedFunctionsCount = 0;
int32_t InlinedNotImportedFunctionsCount = 0;
int32_t InlinedImportedFunctionsToImportingModuleCount = 0;
int32_t InlinedNotImportedFunctionsToImportingModuleCount = 0;
const auto SortedNodes = getSortedNodes();
std::string Out;
Out.reserve(5000);
raw_string_ostream Ostream(Out);
Ostream << "------- Dumping inliner stats for [" << ModuleName
<< "] -------\n";
if (Verbose)
Ostream << "-- List of inlined functions:\n";
for (const auto &Node : SortedNodes) {
assert(Node->second->NumberOfInlines >= Node->second->NumberOfRealInlines);
if (Node->second->NumberOfInlines == 0)
continue;
if (Node->second->Imported) {
InlinedImportedFunctionsCount++;
InlinedImportedFunctionsToImportingModuleCount +=
int(Node->second->NumberOfRealInlines > 0);
} else {
InlinedNotImportedFunctionsCount++;
InlinedNotImportedFunctionsToImportingModuleCount +=
int(Node->second->NumberOfRealInlines > 0);
}
if (Verbose)
Ostream << "Inlined "
<< (Node->second->Imported ? "imported " : "not imported ")
<< "function [" << Node->first() << "]"
<< ": #inlines = " << Node->second->NumberOfInlines
<< ", #inlines_to_importing_module = "
<< Node->second->NumberOfRealInlines << "\n";
}
auto InlinedFunctionsCount =
InlinedImportedFunctionsCount + InlinedNotImportedFunctionsCount;
auto NotImportedFuncCount = AllFunctions - ImportedFunctions;
auto ImportedNotInlinedIntoModule =
ImportedFunctions - InlinedImportedFunctionsToImportingModuleCount;
Ostream << "-- Summary:\n"
<< "All functions: " << AllFunctions
<< ", imported functions: " << ImportedFunctions << "\n"
<< getStatString("inlined functions", InlinedFunctionsCount,
AllFunctions, "all functions")
<< getStatString("imported functions inlined anywhere",
InlinedImportedFunctionsCount, ImportedFunctions,
"imported functions")
<< getStatString("imported functions inlined into importing module",
InlinedImportedFunctionsToImportingModuleCount,
ImportedFunctions, "imported functions",
/*LineEnd=*/false)
<< getStatString(", remaining", ImportedNotInlinedIntoModule,
ImportedFunctions, "imported functions")
<< getStatString("non-imported functions inlined anywhere",
InlinedNotImportedFunctionsCount,
NotImportedFuncCount, "non-imported functions")
<< getStatString(
"non-imported functions inlined into importing module",
InlinedNotImportedFunctionsToImportingModuleCount,
NotImportedFuncCount, "non-imported functions");
Ostream.flush();
dbgs() << Out;
}
void ImportedFunctionsInliningStatistics::calculateRealInlines() {
// Removing duplicated Callers.
llvm::sort(NonImportedCallers);
NonImportedCallers.erase(
std::unique(NonImportedCallers.begin(), NonImportedCallers.end()),
NonImportedCallers.end());
for (const auto &Name : NonImportedCallers) {
auto &Node = *NodesMap[Name];
if (!Node.Visited)
dfs(Node);
}
}
void ImportedFunctionsInliningStatistics::dfs(InlineGraphNode &GraphNode) {
assert(!GraphNode.Visited);
GraphNode.Visited = true;
for (auto *const InlinedFunctionNode : GraphNode.InlinedCallees) {
InlinedFunctionNode->NumberOfRealInlines++;
if (!InlinedFunctionNode->Visited)
dfs(*InlinedFunctionNode);
}
}
ImportedFunctionsInliningStatistics::SortedNodesTy
ImportedFunctionsInliningStatistics::getSortedNodes() {
SortedNodesTy SortedNodes;
SortedNodes.reserve(NodesMap.size());
for (const NodesMapTy::value_type &Node : NodesMap)
SortedNodes.push_back(&Node);
llvm::sort(SortedNodes, [&](const SortedNodesTy::value_type &Lhs,
const SortedNodesTy::value_type &Rhs) {
if (Lhs->second->NumberOfInlines != Rhs->second->NumberOfInlines)
return Lhs->second->NumberOfInlines > Rhs->second->NumberOfInlines;
if (Lhs->second->NumberOfRealInlines != Rhs->second->NumberOfRealInlines)
return Lhs->second->NumberOfRealInlines >
Rhs->second->NumberOfRealInlines;
return Lhs->first() < Rhs->first();
});
return SortedNodes;
}
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