| //===- 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 |