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//===- ExegesisEmitter.cpp - Generate exegesis target data ----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits llvm-exegesis information.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <map>
#include <string>
#include <vector>
using namespace llvm;
#define DEBUG_TYPE "exegesis-emitter"
namespace {
class ExegesisEmitter {
public:
ExegesisEmitter(RecordKeeper &RK);
void run(raw_ostream &OS) const;
private:
unsigned getPfmCounterId(llvm::StringRef Name) const {
const auto It = PfmCounterNameTable.find(Name);
if (It == PfmCounterNameTable.end())
PrintFatalError("no pfm counter id for " + Name);
return It->second;
}
// Collects all the ProcPfmCounters definitions available in this target.
void emitPfmCounters(raw_ostream &OS) const;
void emitPfmCountersInfo(const Record &Def,
unsigned &IssueCountersTableOffset,
raw_ostream &OS) const;
void emitPfmCountersLookupTable(raw_ostream &OS) const;
RecordKeeper &Records;
std::string Target;
// Table of counter name -> counter index.
const std::map<llvm::StringRef, unsigned> PfmCounterNameTable;
};
static std::map<llvm::StringRef, unsigned>
collectPfmCounters(const RecordKeeper &Records) {
std::map<llvm::StringRef, unsigned> PfmCounterNameTable;
const auto AddPfmCounterName = [&PfmCounterNameTable](
const Record *PfmCounterDef) {
const llvm::StringRef Counter = PfmCounterDef->getValueAsString("Counter");
if (!Counter.empty())
PfmCounterNameTable.emplace(Counter, 0);
};
for (Record *Def : Records.getAllDerivedDefinitions("ProcPfmCounters")) {
// Check that ResourceNames are unique.
llvm::SmallSet<llvm::StringRef, 16> Seen;
for (const Record *IssueCounter :
Def->getValueAsListOfDefs("IssueCounters")) {
const llvm::StringRef ResourceName =
IssueCounter->getValueAsString("ResourceName");
if (ResourceName.empty())
PrintFatalError(IssueCounter->getLoc(), "invalid empty ResourceName");
if (!Seen.insert(ResourceName).second)
PrintFatalError(IssueCounter->getLoc(),
"duplicate ResourceName " + ResourceName);
AddPfmCounterName(IssueCounter);
}
AddPfmCounterName(Def->getValueAsDef("CycleCounter"));
AddPfmCounterName(Def->getValueAsDef("UopsCounter"));
}
unsigned Index = 0;
for (auto &NameAndIndex : PfmCounterNameTable)
NameAndIndex.second = Index++;
return PfmCounterNameTable;
}
ExegesisEmitter::ExegesisEmitter(RecordKeeper &RK)
: Records(RK), PfmCounterNameTable(collectPfmCounters(RK)) {
std::vector<Record *> Targets = Records.getAllDerivedDefinitions("Target");
if (Targets.size() == 0)
PrintFatalError("No 'Target' subclasses defined!");
if (Targets.size() != 1)
PrintFatalError("Multiple subclasses of Target defined!");
Target = std::string(Targets[0]->getName());
}
void ExegesisEmitter::emitPfmCountersInfo(const Record &Def,
unsigned &IssueCountersTableOffset,
raw_ostream &OS) const {
const auto CycleCounter =
Def.getValueAsDef("CycleCounter")->getValueAsString("Counter");
const auto UopsCounter =
Def.getValueAsDef("UopsCounter")->getValueAsString("Counter");
const size_t NumIssueCounters =
Def.getValueAsListOfDefs("IssueCounters").size();
OS << "\nstatic const PfmCountersInfo " << Target << Def.getName()
<< " = {\n";
// Cycle Counter.
if (CycleCounter.empty())
OS << " nullptr, // No cycle counter.\n";
else
OS << " " << Target << "PfmCounterNames[" << getPfmCounterId(CycleCounter)
<< "], // Cycle counter\n";
// Uops Counter.
if (UopsCounter.empty())
OS << " nullptr, // No uops counter.\n";
else
OS << " " << Target << "PfmCounterNames[" << getPfmCounterId(UopsCounter)
<< "], // Uops counter\n";
// Issue Counters
if (NumIssueCounters == 0)
OS << " nullptr, // No issue counters.\n 0\n";
else
OS << " " << Target << "PfmIssueCounters + " << IssueCountersTableOffset
<< ", " << NumIssueCounters << " // Issue counters.\n";
OS << "};\n";
IssueCountersTableOffset += NumIssueCounters;
}
void ExegesisEmitter::emitPfmCounters(raw_ostream &OS) const {
// Emit the counter name table.
OS << "\nstatic const char *" << Target << "PfmCounterNames[] = {\n";
for (const auto &NameAndIndex : PfmCounterNameTable)
OS << " \"" << NameAndIndex.first << "\", // " << NameAndIndex.second
<< "\n";
OS << "};\n\n";
// Emit the IssueCounters table.
const auto PfmCounterDefs =
Records.getAllDerivedDefinitions("ProcPfmCounters");
// Only emit if non-empty.
const bool HasAtLeastOnePfmIssueCounter =
llvm::any_of(PfmCounterDefs, [](const Record *Def) {
return !Def->getValueAsListOfDefs("IssueCounters").empty();
});
if (HasAtLeastOnePfmIssueCounter) {
OS << "static const PfmCountersInfo::IssueCounter " << Target
<< "PfmIssueCounters[] = {\n";
for (const Record *Def : PfmCounterDefs) {
for (const Record *ICDef : Def->getValueAsListOfDefs("IssueCounters"))
OS << " { " << Target << "PfmCounterNames["
<< getPfmCounterId(ICDef->getValueAsString("Counter")) << "], \""
<< ICDef->getValueAsString("ResourceName") << "\"},\n";
}
OS << "};\n";
}
// Now generate the PfmCountersInfo.
unsigned IssueCountersTableOffset = 0;
for (const Record *Def : PfmCounterDefs)
emitPfmCountersInfo(*Def, IssueCountersTableOffset, OS);
OS << "\n";
} // namespace
void ExegesisEmitter::emitPfmCountersLookupTable(raw_ostream &OS) const {
std::vector<Record *> Bindings =
Records.getAllDerivedDefinitions("PfmCountersBinding");
assert(!Bindings.empty() && "there must be at least one binding");
llvm::sort(Bindings, [](const Record *L, const Record *R) {
return L->getValueAsString("CpuName") < R->getValueAsString("CpuName");
});
OS << "// Sorted (by CpuName) array of pfm counters.\n"
<< "static const CpuAndPfmCounters " << Target << "CpuPfmCounters[] = {\n";
for (Record *Binding : Bindings) {
// Emit as { "cpu", procinit },
OS << " { \"" //
<< Binding->getValueAsString("CpuName") << "\"," //
<< " &" << Target << Binding->getValueAsDef("Counters")->getName() //
<< " },\n";
}
OS << "};\n\n";
}
void ExegesisEmitter::run(raw_ostream &OS) const {
emitSourceFileHeader("Exegesis Tables", OS);
emitPfmCounters(OS);
emitPfmCountersLookupTable(OS);
}
} // end anonymous namespace
namespace llvm {
void EmitExegesis(RecordKeeper &RK, raw_ostream &OS) {
ExegesisEmitter(RK).run(OS);
}
} // end namespace llvm
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