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https://github.com/c64scene-ar/llvm-6502.git
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8b9ea8099e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31396 91177308-0d34-0410-b5e6-96231b3b80d8
513 lines
15 KiB
C++
513 lines
15 KiB
C++
//===- SubtargetEmitter.cpp - Generate subtarget enumerations -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by James M. Laskey and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend emits subtarget enumerations.
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//
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//===----------------------------------------------------------------------===//
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#include "SubtargetEmitter.h"
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#include "CodeGenTarget.h"
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#include "Record.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Debug.h"
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#include <algorithm>
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using namespace llvm;
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//
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// Record sort by name function.
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//
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struct LessRecord {
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bool operator()(const Record *Rec1, const Record *Rec2) const {
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return Rec1->getName() < Rec2->getName();
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}
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};
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//
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// Record sort by field "Name" function.
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//
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struct LessRecordFieldName {
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bool operator()(const Record *Rec1, const Record *Rec2) const {
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return Rec1->getValueAsString("Name") < Rec2->getValueAsString("Name");
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}
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};
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//
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// Enumeration - Emit the specified class as an enumeration.
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//
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void SubtargetEmitter::Enumeration(std::ostream &OS,
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const char *ClassName,
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bool isBits) {
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// Get all records of class and sort
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std::vector<Record*> DefList = Records.getAllDerivedDefinitions(ClassName);
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std::sort(DefList.begin(), DefList.end(), LessRecord());
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// Open enumeration
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OS << "enum {\n";
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// For each record
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for (unsigned i = 0, N = DefList.size(); i < N;) {
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// Next record
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Record *Def = DefList[i];
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// Get and emit name
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std::string Name = Def->getName();
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OS << " " << Name;
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// If bit flags then emit expression (1 << i)
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if (isBits) OS << " = " << " 1 << " << i;
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// Depending on 'if more in the list' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// Close enumeration
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OS << "};\n";
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}
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//
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// FeatureKeyValues - Emit data of all the subtarget features. Used by command
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// line.
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//
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void SubtargetEmitter::FeatureKeyValues(std::ostream &OS) {
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// Gather and sort all the features
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std::vector<Record*> FeatureList =
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Records.getAllDerivedDefinitions("SubtargetFeature");
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std::sort(FeatureList.begin(), FeatureList.end(), LessRecord());
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// Begin feature table
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OS << "// Sorted (by key) array of values for CPU features.\n"
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<< "static llvm::SubtargetFeatureKV FeatureKV[] = {\n";
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// For each feature
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for (unsigned i = 0, N = FeatureList.size(); i < N;) {
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// Next feature
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Record *Feature = FeatureList[i];
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std::string Name = Feature->getName();
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std::string CommandLineName = Feature->getValueAsString("Name");
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std::string Desc = Feature->getValueAsString("Desc");
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// Emit as { "feature", "decription", feactureEnum }
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OS << " { "
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<< "\"" << CommandLineName << "\", "
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<< "\"" << Desc << "\", "
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<< Name
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<< " }";
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// Depending on 'if more in the list' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// End feature table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" FeatureKVSize = sizeof(FeatureKV)/sizeof(llvm::SubtargetFeatureKV)\n";
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OS<<"};\n";
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}
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//
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// CPUKeyValues - Emit data of all the subtarget processors. Used by command
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// line.
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//
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void SubtargetEmitter::CPUKeyValues(std::ostream &OS) {
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// Gather and sort processor information
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std::vector<Record*> ProcessorList =
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Records.getAllDerivedDefinitions("Processor");
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std::sort(ProcessorList.begin(), ProcessorList.end(), LessRecordFieldName());
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// Begin processor table
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OS << "// Sorted (by key) array of values for CPU subtype.\n"
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<< "static const llvm::SubtargetFeatureKV SubTypeKV[] = {\n";
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// For each processor
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for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
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// Next processor
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Record *Processor = ProcessorList[i];
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std::string Name = Processor->getValueAsString("Name");
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std::vector<Record*> FeatureList =
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Processor->getValueAsListOfDefs("Features");
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// Emit as { "cpu", "description", f1 | f2 | ... fn },
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OS << " { "
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<< "\"" << Name << "\", "
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<< "\"Select the " << Name << " processor\", ";
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if (FeatureList.empty()) {
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OS << "0";
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} else {
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for (unsigned j = 0, M = FeatureList.size(); j < M;) {
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Record *Feature = FeatureList[j];
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std::string Name = Feature->getName();
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OS << Name;
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if (++j < M) OS << " | ";
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}
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}
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OS << " }";
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// Depending on 'if more in the list' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// End processor table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" SubTypeKVSize = sizeof(SubTypeKV)/sizeof(llvm::SubtargetFeatureKV)\n";
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OS<<"};\n";
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}
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//
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// CollectAllItinClasses - Gathers and enumerates all the itinerary classes.
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// Returns itinerary class count.
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//
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unsigned SubtargetEmitter::CollectAllItinClasses(std::ostream &OS,
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std::map<std::string, unsigned> &ItinClassesMap) {
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// Gather and sort all itinerary classes
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std::vector<Record*> ItinClassList =
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Records.getAllDerivedDefinitions("InstrItinClass");
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std::sort(ItinClassList.begin(), ItinClassList.end(), LessRecord());
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// For each itinerary class
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unsigned N = ItinClassList.size();
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for (unsigned i = 0; i < N; i++) {
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// Next itinerary class
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Record *ItinClass = ItinClassList[i];
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// Get name of itinerary class
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std::string Name = ItinClass->getName();
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// Assign itinerary class a unique number
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ItinClassesMap[Name] = i;
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}
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" ItinClassesSize = " << N << "\n";
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OS<<"};\n";
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// Return itinerary class count
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return N;
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}
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//
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// FormItineraryString - Compose a string containing the data initialization
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// for the specified itinerary. N is the number of stages.
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//
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void SubtargetEmitter::FormItineraryString(Record *ItinData,
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std::string &ItinString,
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unsigned &NStages) {
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// Get states list
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std::vector<Record*> StageList = ItinData->getValueAsListOfDefs("Stages");
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// For each stage
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unsigned N = NStages = StageList.size();
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for (unsigned i = 0; i < N; i++) {
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// Next stage
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Record *Stage = StageList[i];
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// Form string as ,{ cycles, u1 | u2 | ... | un }
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int Cycles = Stage->getValueAsInt("Cycles");
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ItinString += " { " + itostr(Cycles) + ", ";
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// Get unit list
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std::vector<Record*> UnitList = Stage->getValueAsListOfDefs("Units");
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// For each unit
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for (unsigned j = 0, M = UnitList.size(); j < M;) {
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// Next unit
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Record *Unit = UnitList[j];
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// Add name and bitwise or
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ItinString += Unit->getName();
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if (++j < M) ItinString += " | ";
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}
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// Close off stage
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ItinString += " }";
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}
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}
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//
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// EmitStageData - Generate unique itinerary stages. Record itineraries for
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// processors.
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//
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void SubtargetEmitter::EmitStageData(std::ostream &OS,
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unsigned NItinClasses,
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std::map<std::string, unsigned> &ItinClassesMap,
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std::vector<std::vector<InstrItinerary> > &ProcList) {
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// Gather processor iteraries
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std::vector<Record*> ProcItinList =
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Records.getAllDerivedDefinitions("ProcessorItineraries");
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// If just no itinerary then don't bother
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if (ProcItinList.size() < 2) return;
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// Begin stages table
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OS << "static llvm::InstrStage Stages[] = {\n"
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" { 0, 0 }, // No itinerary\n";
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unsigned ItinEnum = 1;
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std::map<std::string, unsigned> ItinMap;
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for (unsigned i = 0, N = ProcItinList.size(); i < N; i++) {
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// Next record
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Record *Proc = ProcItinList[i];
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// Get processor itinerary name
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std::string Name = Proc->getName();
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// Skip default
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if (Name == "NoItineraries") continue;
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// Create and expand processor itinerary to cover all itinerary classes
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std::vector<InstrItinerary> ItinList;
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ItinList.resize(NItinClasses);
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// Get itinerary data list
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std::vector<Record*> ItinDataList = Proc->getValueAsListOfDefs("IID");
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// For each itinerary data
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for (unsigned j = 0, M = ItinDataList.size(); j < M; j++) {
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// Next itinerary data
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Record *ItinData = ItinDataList[j];
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// Get string and stage count
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std::string ItinString;
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unsigned NStages;
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FormItineraryString(ItinData, ItinString, NStages);
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// Check to see if it already exists
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unsigned Find = ItinMap[ItinString];
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// If new itinerary
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if (Find == 0) {
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// Emit as { cycles, u1 | u2 | ... | un }, // index
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OS << ItinString << ", // " << ItinEnum << "\n";
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// Record Itin class number
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ItinMap[ItinString] = Find = ItinEnum++;
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}
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// Set up itinerary as location and location + stage count
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InstrItinerary Intinerary = { Find, Find + NStages };
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// Locate where to inject into processor itinerary table
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std::string Name = ItinData->getValueAsDef("TheClass")->getName();
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Find = ItinClassesMap[Name];
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// Inject - empty slots will be 0, 0
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ItinList[Find] = Intinerary;
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}
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// Add process itinerary to list
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ProcList.push_back(ItinList);
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}
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// Closing stage
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OS << " { 0, 0 } // End itinerary\n";
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// End stages table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" StagesSize = sizeof(Stages)/sizeof(llvm::InstrStage)\n";
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OS<<"};\n";
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}
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//
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// EmitProcessorData - Generate data for processor itineraries.
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//
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void SubtargetEmitter::EmitProcessorData(std::ostream &OS,
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std::vector<std::vector<InstrItinerary> > &ProcList) {
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// Get an iterator for processor itinerary stages
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std::vector<std::vector<InstrItinerary> >::iterator
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ProcListIter = ProcList.begin();
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// For each processor itinerary
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std::vector<Record*> Itins =
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Records.getAllDerivedDefinitions("ProcessorItineraries");
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for (unsigned i = 0, N = Itins.size(); i < N; i++) {
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// Next record
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Record *Itin = Itins[i];
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// Get processor itinerary name
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std::string Name = Itin->getName();
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// Skip default
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if (Name == "NoItineraries") continue;
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// Begin processor itinerary table
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OS << "\n";
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OS << "static llvm::InstrItinerary " << Name << "[] = {\n";
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// For each itinerary class
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std::vector<InstrItinerary> &ItinList = *ProcListIter++;
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for (unsigned j = 0, M = ItinList.size(); j < M;) {
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InstrItinerary &Intinerary = ItinList[j];
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// Emit in the form of { first, last } // index
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if (Intinerary.First == 0) {
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OS << " { 0, 0 }";
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} else {
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OS << " { " << Intinerary.First << ", " << Intinerary.Last << " }";
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}
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// If more in list add comma
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if (++j < M) OS << ",";
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OS << " // " << (j - 1) << "\n";
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}
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// End processor itinerary table
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OS << "};\n";
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}
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}
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//
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// EmitProcessorLookup - generate cpu name to itinerary lookup table.
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//
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void SubtargetEmitter::EmitProcessorLookup(std::ostream &OS) {
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// Gather and sort processor information
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std::vector<Record*> ProcessorList =
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Records.getAllDerivedDefinitions("Processor");
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std::sort(ProcessorList.begin(), ProcessorList.end(), LessRecordFieldName());
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// Begin processor table
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OS << "\n";
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OS << "// Sorted (by key) array of itineraries for CPU subtype.\n"
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<< "static const llvm::SubtargetInfoKV ProcItinKV[] = {\n";
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// For each processor
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for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
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// Next processor
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Record *Processor = ProcessorList[i];
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std::string Name = Processor->getValueAsString("Name");
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std::string ProcItin = Processor->getValueAsDef("ProcItin")->getName();
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// Emit as { "cpu", procinit },
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OS << " { "
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<< "\"" << Name << "\", "
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<< "(void *)&" << ProcItin;
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OS << " }";
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// Depending on ''if more in the list'' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// End processor table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" ProcItinKVSize = sizeof(ProcItinKV)/"
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"sizeof(llvm::SubtargetInfoKV)\n";
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OS<<"};\n";
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}
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//
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// EmitData - Emits all stages and itineries, folding common patterns.
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//
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void SubtargetEmitter::EmitData(std::ostream &OS) {
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std::map<std::string, unsigned> ItinClassesMap;
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std::vector<std::vector<InstrItinerary> > ProcList;
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// Enumerate all the itinerary classes
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unsigned NItinClasses = CollectAllItinClasses(OS, ItinClassesMap);
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// Make sure the rest is worth the effort
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HasItineraries = NItinClasses != 1; // Ignore NoItinerary.
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if (HasItineraries) {
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// Emit the stage data
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EmitStageData(OS, NItinClasses, ItinClassesMap, ProcList);
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// Emit the processor itinerary data
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EmitProcessorData(OS, ProcList);
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// Emit the processor lookup data
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EmitProcessorLookup(OS);
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}
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}
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//
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// ParseFeaturesFunction - Produces a subtarget specific function for parsing
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// the subtarget features string.
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//
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void SubtargetEmitter::ParseFeaturesFunction(std::ostream &OS) {
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std::vector<Record*> Features =
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Records.getAllDerivedDefinitions("SubtargetFeature");
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std::sort(Features.begin(), Features.end(), LessRecord());
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OS << "// ParseSubtargetFeatures - Parses features string setting specified\n"
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"// subtarget options.\n"
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"void llvm::";
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OS << Target;
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OS << "Subtarget::ParseSubtargetFeatures(const std::string &FS,\n"
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" const std::string &CPU) {\n"
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" SubtargetFeatures Features(FS);\n"
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" Features.setCPUIfNone(CPU);\n"
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" uint32_t Bits = Features.getBits(SubTypeKV, SubTypeKVSize,\n"
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" FeatureKV, FeatureKVSize);\n";
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for (unsigned i = 0; i < Features.size(); i++) {
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// Next record
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Record *R = Features[i];
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std::string Instance = R->getName();
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std::string Name = R->getValueAsString("Name");
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std::string Value = R->getValueAsString("Value");
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std::string Attribute = R->getValueAsString("Attribute");
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OS << " if ((Bits & " << Instance << ") != 0) "
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<< Attribute << " = " << Value << ";\n";
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}
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if (HasItineraries) {
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OS << "\n"
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<< " InstrItinerary *Itinerary = (InstrItinerary *)"
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"Features.getInfo(ProcItinKV, ProcItinKVSize);\n"
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" InstrItins = InstrItineraryData(Stages, Itinerary);\n";
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}
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OS << "}\n";
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}
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//
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// SubtargetEmitter::run - Main subtarget enumeration emitter.
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//
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void SubtargetEmitter::run(std::ostream &OS) {
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Target = CodeGenTarget().getName();
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EmitSourceFileHeader("Subtarget Enumeration Source Fragment", OS);
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OS << "#include \"llvm/Target/SubtargetFeature.h\"\n";
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OS << "#include \"llvm/Target/TargetInstrItineraries.h\"\n\n";
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Enumeration(OS, "FuncUnit", true);
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OS<<"\n";
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// Enumeration(OS, "InstrItinClass", false);
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// OS<<"\n";
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Enumeration(OS, "SubtargetFeature", true);
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OS<<"\n";
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FeatureKeyValues(OS);
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OS<<"\n";
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CPUKeyValues(OS);
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OS<<"\n";
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EmitData(OS);
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OS<<"\n";
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ParseFeaturesFunction(OS);
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}
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