utils/TableGen/LLVMCConfigurationEmitter.cpp

   1 //===- LLVMCConfigurationEmitter.cpp - Generate LLVMC config ----*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open
   6 // Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This tablegen backend is responsible for emitting LLVMC configuration code.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "LLVMCConfigurationEmitter.h"
  15 #include "Record.h"
  16
  17 #include "llvm/ADT/IntrusiveRefCntPtr.h"
  18 #include "llvm/ADT/StringMap.h"
  19 #include "llvm/ADT/StringSet.h"
  20
  21 #include <algorithm>
  22 #include <cassert>
  23 #include <functional>
  24 #include <stdexcept>
  25 #include <string>
  26 #include <typeinfo>
  27
  28
  29 using namespace llvm;
  30
  31 namespace {
  32
  33 //===----------------------------------------------------------------------===//
  34 /// Typedefs
  35
  36 typedef std::vector<Record*> RecordVector;
  37 typedef std::vector<const DagInit*> DagVector;
  38 typedef std::vector<std::string> StrVector;
  39
  40 //===----------------------------------------------------------------------===//
  41 /// Constants
  42
  43 // Indentation.
  44 const unsigned TabWidth = 4;
  45 const unsigned Indent1  = TabWidth*1;
  46 const unsigned Indent2  = TabWidth*2;
  47 const unsigned Indent3  = TabWidth*3;
  48 const unsigned Indent4  = TabWidth*4;
  49
  50 // Default help string.
  51 const char * const DefaultHelpString = "NO HELP MESSAGE PROVIDED";
  52
  53 // Name for the "sink" option.
  54 const char * const SinkOptionName = "SinkOption";
  55
  56 //===----------------------------------------------------------------------===//
  57 /// Helper functions
  58
  59 /// Id - An 'identity' function object.
  60 struct Id {
  61   template<typename T0>
  62   void operator()(const T0&) const {
  63   }
  64   template<typename T0, typename T1>
  65   void operator()(const T0&, const T1&) const {
  66   }
  67   template<typename T0, typename T1, typename T2>
  68   void operator()(const T0&, const T1&, const T2&) const {
  69   }
  70 };
  71
  72 int InitPtrToInt(const Init* ptr) {
  73   const IntInit& val = dynamic_cast<const IntInit&>(*ptr);
  74   return val.getValue();
  75 }
  76
  77 const std::string& InitPtrToString(const Init* ptr) {
  78   const StringInit& val = dynamic_cast<const StringInit&>(*ptr);
  79   return val.getValue();
  80 }
  81
  82 const ListInit& InitPtrToList(const Init* ptr) {
  83   const ListInit& val = dynamic_cast<const ListInit&>(*ptr);
  84   return val;
  85 }
  86
  87 const DagInit& InitPtrToDag(const Init* ptr) {
  88   const DagInit& val = dynamic_cast<const DagInit&>(*ptr);
  89   return val;
  90 }
  91
  92 const std::string GetOperatorName(const DagInit& D) {
  93   return D.getOperator()->getAsString();
  94 }
  95
  96 /// CheckBooleanConstant - Check that the provided value is a boolean constant.
  97 void CheckBooleanConstant(const Init* I) {
  98   const DefInit& val = dynamic_cast<const DefInit&>(*I);
  99   const std::string& str = val.getAsString();
 100
 101   if (str != "true" && str != "false") {
 102     throw "Incorrect boolean value: '" + str +
 103       "': must be either 'true' or 'false'";
 104   }
 105 }
 106
 107 // CheckNumberOfArguments - Ensure that the number of args in d is
 108 // greater than or equal to min_arguments, otherwise throw an exception.
 109 void CheckNumberOfArguments (const DagInit& d, unsigned minArgs) {
 110   if (d.getNumArgs() < minArgs)
 111     throw GetOperatorName(d) + ": too few arguments!";
 112 }
 113
 114 // EscapeVariableName - Escape commas and other symbols not allowed
 115 // in the C++ variable names. Makes it possible to use options named
 116 // like "Wa," (useful for prefix options).
 117 std::string EscapeVariableName (const std::string& Var) {
 118   std::string ret;
 119   for (unsigned i = 0; i != Var.size(); ++i) {
 120     char cur_char = Var[i];
 121     if (cur_char == ',') {
 122       ret += "_comma_";
 123     }
 124     else if (cur_char == '+') {
 125       ret += "_plus_";
 126     }
 127     else if (cur_char == '-') {
 128       ret += "_dash_";
 129     }
 130     else {
 131       ret.push_back(cur_char);
 132     }
 133   }
 134   return ret;
 135 }
 136
 137 /// EscapeQuotes - Replace '"' with '\"'.
 138 std::string EscapeQuotes (const std::string& Var) {
 139   std::string ret;
 140   for (unsigned i = 0; i != Var.size(); ++i) {
 141     char cur_char = Var[i];
 142     if (cur_char == '"') {
 143       ret += "\\\"";
 144     }
 145     else {
 146       ret.push_back(cur_char);
 147     }
 148   }
 149   return ret;
 150 }
 151
 152 /// OneOf - Does the input string contain this character?
 153 bool OneOf(const char* lst, char c) {
 154   while (*lst) {
 155     if (*lst++ == c)
 156       return true;
 157   }
 158   return false;
 159 }
 160
 161 template <class I, class S>
 162 void CheckedIncrement(I& P, I E, S ErrorString) {
 163   ++P;
 164   if (P == E)
 165     throw ErrorString;
 166 }
 167
 168 //===----------------------------------------------------------------------===//
 169 /// Back-end specific code
 170
 171
 172 /// OptionType - One of six different option types. See the
 173 /// documentation for detailed description of differences.
 174 namespace OptionType {
 175
 176   enum OptionType { Alias, Switch, SwitchList,
 177                     Parameter, ParameterList, Prefix, PrefixList };
 178
 179   bool IsAlias(OptionType t) {
 180     return (t == Alias);
 181   }
 182
 183   bool IsList (OptionType t) {
 184     return (t == SwitchList || t == ParameterList || t == PrefixList);
 185   }
 186
 187   bool IsSwitch (OptionType t) {
 188     return (t == Switch);
 189   }
 190
 191   bool IsSwitchList (OptionType t) {
 192     return (t == SwitchList);
 193   }
 194
 195   bool IsParameter (OptionType t) {
 196     return (t == Parameter || t == Prefix);
 197   }
 198
 199 }
 200
 201 OptionType::OptionType stringToOptionType(const std::string& T) {
 202   if (T == "alias_option")
 203     return OptionType::Alias;
 204   else if (T == "switch_option")
 205     return OptionType::Switch;
 206   else if (T == "switch_list_option")
 207     return OptionType::SwitchList;
 208   else if (T == "parameter_option")
 209     return OptionType::Parameter;
 210   else if (T == "parameter_list_option")
 211     return OptionType::ParameterList;
 212   else if (T == "prefix_option")
 213     return OptionType::Prefix;
 214   else if (T == "prefix_list_option")
 215     return OptionType::PrefixList;
 216   else
 217     throw "Unknown option type: " + T + '!';
 218 }
 219
 220 namespace OptionDescriptionFlags {
 221   enum OptionDescriptionFlags { Required = 0x1, Hidden = 0x2,
 222                                 ReallyHidden = 0x4, OneOrMore = 0x8,
 223                                 Optional = 0x10, CommaSeparated = 0x20,
 224                                 ForwardNotSplit = 0x40, ZeroOrMore = 0x80 };
 225 }
 226
 227 /// OptionDescription - Represents data contained in a single
 228 /// OptionList entry.
 229 struct OptionDescription {
 230   OptionType::OptionType Type;
 231   std::string Name;
 232   unsigned Flags;
 233   std::string Help;
 234   unsigned MultiVal;
 235   Init* InitVal;
 236
 237   OptionDescription(OptionType::OptionType t = OptionType::Switch,
 238                     const std::string& n = "",
 239                     const std::string& h = DefaultHelpString)
 240     : Type(t), Name(n), Flags(0x0), Help(h), MultiVal(1), InitVal(0)
 241   {}
 242
 243   /// GenTypeDeclaration - Returns the C++ variable type of this
 244   /// option.
 245   const char* GenTypeDeclaration() const;
 246
 247   /// GenVariableName - Returns the variable name used in the
 248   /// generated C++ code.
 249   std::string GenVariableName() const
 250   { return "autogenerated::" + GenOptionType() + EscapeVariableName(Name); }
 251
 252   /// GenPlainVariableName - Returns the variable name without the namespace
 253   /// prefix.
 254   std::string GenPlainVariableName() const
 255   { return GenOptionType() + EscapeVariableName(Name); }
 256
 257   /// Merge - Merge two option descriptions.
 258   void Merge (const OptionDescription& other);
 259
 260   /// CheckConsistency - Check that the flags are consistent.
 261   void CheckConsistency() const;
 262
 263   // Misc convenient getters/setters.
 264
 265   bool isAlias() const;
 266
 267   bool isMultiVal() const;
 268
 269   bool isCommaSeparated() const;
 270   void setCommaSeparated();
 271
 272   bool isForwardNotSplit() const;
 273   void setForwardNotSplit();
 274
 275   bool isRequired() const;
 276   void setRequired();
 277
 278   bool isOneOrMore() const;
 279   void setOneOrMore();
 280
 281   bool isZeroOrMore() const;
 282   void setZeroOrMore();
 283
 284   bool isOptional() const;
 285   void setOptional();
 286
 287   bool isHidden() const;
 288   void setHidden();
 289
 290   bool isReallyHidden() const;
 291   void setReallyHidden();
 292
 293   bool isSwitch() const
 294   { return OptionType::IsSwitch(this->Type); }
 295
 296   bool isSwitchList() const
 297   { return OptionType::IsSwitchList(this->Type); }
 298
 299   bool isParameter() const
 300   { return OptionType::IsParameter(this->Type); }
 301
 302   bool isList() const
 303   { return OptionType::IsList(this->Type); }
 304
 305   bool isParameterList() const
 306   { return (OptionType::IsList(this->Type)
 307             && !OptionType::IsSwitchList(this->Type)); }
 308
 309 private:
 310
 311   // GenOptionType - Helper function used by GenVariableName().
 312   std::string GenOptionType() const;
 313 };
 314
 315 void OptionDescription::CheckConsistency() const {
 316   unsigned i = 0;
 317
 318   i += this->isRequired();
 319   i += this->isOptional();
 320   i += this->isOneOrMore();
 321   i += this->isZeroOrMore();
 322
 323   if (i > 1) {
 324     throw "Only one of (required), (optional), (one_or_more) or "
 325       "(zero_or_more) properties is allowed!";
 326   }
 327 }
 328
 329 void OptionDescription::Merge (const OptionDescription& other)
 330 {
 331   if (other.Type != Type)
 332     throw "Conflicting definitions for the option " + Name + "!";
 333
 334   if (Help == other.Help || Help == DefaultHelpString)
 335     Help = other.Help;
 336   else if (other.Help != DefaultHelpString) {
 337     llvm::errs() << "Warning: several different help strings"
 338       " defined for option " + Name + "\n";
 339   }
 340
 341   Flags |= other.Flags;
 342 }
 343
 344 bool OptionDescription::isAlias() const {
 345   return OptionType::IsAlias(this->Type);
 346 }
 347
 348 bool OptionDescription::isMultiVal() const {
 349   return MultiVal > 1;
 350 }
 351
 352 bool OptionDescription::isCommaSeparated() const {
 353   return Flags & OptionDescriptionFlags::CommaSeparated;
 354 }
 355 void OptionDescription::setCommaSeparated() {
 356   Flags |= OptionDescriptionFlags::CommaSeparated;
 357 }
 358
 359 bool OptionDescription::isForwardNotSplit() const {
 360   return Flags & OptionDescriptionFlags::ForwardNotSplit;
 361 }
 362 void OptionDescription::setForwardNotSplit() {
 363   Flags |= OptionDescriptionFlags::ForwardNotSplit;
 364 }
 365
 366 bool OptionDescription::isRequired() const {
 367   return Flags & OptionDescriptionFlags::Required;
 368 }
 369 void OptionDescription::setRequired() {
 370   Flags |= OptionDescriptionFlags::Required;
 371 }
 372
 373 bool OptionDescription::isOneOrMore() const {
 374   return Flags & OptionDescriptionFlags::OneOrMore;
 375 }
 376 void OptionDescription::setOneOrMore() {
 377   Flags |= OptionDescriptionFlags::OneOrMore;
 378 }
 379
 380 bool OptionDescription::isZeroOrMore() const {
 381   return Flags & OptionDescriptionFlags::ZeroOrMore;
 382 }
 383 void OptionDescription::setZeroOrMore() {
 384   Flags |= OptionDescriptionFlags::ZeroOrMore;
 385 }
 386
 387 bool OptionDescription::isOptional() const {
 388   return Flags & OptionDescriptionFlags::Optional;
 389 }
 390 void OptionDescription::setOptional() {
 391   Flags |= OptionDescriptionFlags::Optional;
 392 }
 393
 394 bool OptionDescription::isHidden() const {
 395   return Flags & OptionDescriptionFlags::Hidden;
 396 }
 397 void OptionDescription::setHidden() {
 398   Flags |= OptionDescriptionFlags::Hidden;
 399 }
 400
 401 bool OptionDescription::isReallyHidden() const {
 402   return Flags & OptionDescriptionFlags::ReallyHidden;
 403 }
 404 void OptionDescription::setReallyHidden() {
 405   Flags |= OptionDescriptionFlags::ReallyHidden;
 406 }
 407
 408 const char* OptionDescription::GenTypeDeclaration() const {
 409   switch (Type) {
 410   case OptionType::Alias:
 411     return "cl::alias";
 412   case OptionType::PrefixList:
 413   case OptionType::ParameterList:
 414     return "cl::list<std::string>";
 415   case OptionType::Switch:
 416     return "cl::opt<bool>";
 417   case OptionType::SwitchList:
 418     return "cl::list<bool>";
 419   case OptionType::Parameter:
 420   case OptionType::Prefix:
 421   default:
 422     return "cl::opt<std::string>";
 423   }
 424 }
 425
 426 std::string OptionDescription::GenOptionType() const {
 427   switch (Type) {
 428   case OptionType::Alias:
 429     return "Alias_";
 430   case OptionType::PrefixList:
 431   case OptionType::ParameterList:
 432     return "List_";
 433   case OptionType::Switch:
 434     return "Switch_";
 435   case OptionType::SwitchList:
 436     return "SwitchList_";
 437   case OptionType::Prefix:
 438   case OptionType::Parameter:
 439   default:
 440     return "Parameter_";
 441   }
 442 }
 443
 444 /// OptionDescriptions - An OptionDescription array plus some helper
 445 /// functions.
 446 class OptionDescriptions {
 447   typedef StringMap<OptionDescription> container_type;
 448
 449   /// Descriptions - A list of OptionDescriptions.
 450   container_type Descriptions;
 451
 452 public:
 453   /// FindOption - exception-throwing wrapper for find().
 454   const OptionDescription& FindOption(const std::string& OptName) const;
 455
 456   // Wrappers for FindOption that throw an exception in case the option has a
 457   // wrong type.
 458   const OptionDescription& FindSwitch(const std::string& OptName) const;
 459   const OptionDescription& FindParameter(const std::string& OptName) const;
 460   const OptionDescription& FindParameterList(const std::string& OptName) const;
 461   const OptionDescription&
 462   FindListOrParameter(const std::string& OptName) const;
 463   const OptionDescription&
 464   FindParameterListOrParameter(const std::string& OptName) const;
 465
 466   /// insertDescription - Insert new OptionDescription into
 467   /// OptionDescriptions list
 468   void InsertDescription (const OptionDescription& o);
 469
 470   // Support for STL-style iteration
 471   typedef container_type::const_iterator const_iterator;
 472   const_iterator begin() const { return Descriptions.begin(); }
 473   const_iterator end() const { return Descriptions.end(); }
 474 };
 475
 476 const OptionDescription&
 477 OptionDescriptions::FindOption(const std::string& OptName) const {
 478   const_iterator I = Descriptions.find(OptName);
 479   if (I != Descriptions.end())
 480     return I->second;
 481   else
 482     throw OptName + ": no such option!";
 483 }
 484
 485 const OptionDescription&
 486 OptionDescriptions::FindSwitch(const std::string& OptName) const {
 487   const OptionDescription& OptDesc = this->FindOption(OptName);
 488   if (!OptDesc.isSwitch())
 489     throw OptName + ": incorrect option type - should be a switch!";
 490   return OptDesc;
 491 }
 492
 493 const OptionDescription&
 494 OptionDescriptions::FindParameterList(const std::string& OptName) const {
 495   const OptionDescription& OptDesc = this->FindOption(OptName);
 496   if (!OptDesc.isList() || OptDesc.isSwitchList())
 497     throw OptName + ": incorrect option type - should be a parameter list!";
 498   return OptDesc;
 499 }
 500
 501 const OptionDescription&
 502 OptionDescriptions::FindParameter(const std::string& OptName) const {
 503   const OptionDescription& OptDesc = this->FindOption(OptName);
 504   if (!OptDesc.isParameter())
 505     throw OptName + ": incorrect option type - should be a parameter!";
 506   return OptDesc;
 507 }
 508
 509 const OptionDescription&
 510 OptionDescriptions::FindListOrParameter(const std::string& OptName) const {
 511   const OptionDescription& OptDesc = this->FindOption(OptName);
 512   if (!OptDesc.isList() && !OptDesc.isParameter())
 513     throw OptName
 514       + ": incorrect option type - should be a list or parameter!";
 515   return OptDesc;
 516 }
 517
 518 const OptionDescription&
 519 OptionDescriptions::FindParameterListOrParameter
 520 (const std::string& OptName) const {
 521   const OptionDescription& OptDesc = this->FindOption(OptName);
 522   if ((!OptDesc.isList() && !OptDesc.isParameter()) || OptDesc.isSwitchList())
 523     throw OptName
 524       + ": incorrect option type - should be a parameter list or parameter!";
 525   return OptDesc;
 526 }
 527
 528 void OptionDescriptions::InsertDescription (const OptionDescription& o) {
 529   container_type::iterator I = Descriptions.find(o.Name);
 530   if (I != Descriptions.end()) {
 531     OptionDescription& D = I->second;
 532     D.Merge(o);
 533   }
 534   else {
 535     Descriptions[o.Name] = o;
 536   }
 537 }
 538
 539 /// HandlerTable - A base class for function objects implemented as
 540 /// 'tables of handlers'.
 541 template <typename Handler>
 542 class HandlerTable {
 543 protected:
 544   // Implementation details.
 545
 546   /// HandlerMap - A map from property names to property handlers
 547   typedef StringMap<Handler> HandlerMap;
 548
 549   static HandlerMap Handlers_;
 550   static bool staticMembersInitialized_;
 551
 552 public:
 553
 554   Handler GetHandler (const std::string& HandlerName) const {
 555     typename HandlerMap::iterator method = Handlers_.find(HandlerName);
 556
 557     if (method != Handlers_.end()) {
 558       Handler h = method->second;
 559       return h;
 560     }
 561     else {
 562       throw "No handler found for property " + HandlerName + "!";
 563     }
 564   }
 565
 566   void AddHandler(const char* Property, Handler H) {
 567     Handlers_[Property] = H;
 568   }
 569
 570 };
 571
 572 template <class Handler, class FunctionObject>
 573 Handler GetHandler(FunctionObject* Obj, const DagInit& Dag) {
 574   const std::string& HandlerName = GetOperatorName(Dag);
 575   return Obj->GetHandler(HandlerName);
 576 }
 577
 578 template <class FunctionObject>
 579 void InvokeDagInitHandler(FunctionObject* Obj, Init* I) {
 580   typedef void (FunctionObject::*Handler) (const DagInit&);
 581
 582   const DagInit& Dag = InitPtrToDag(I);
 583   Handler h = GetHandler<Handler>(Obj, Dag);
 584
 585   ((Obj)->*(h))(Dag);
 586 }
 587
 588 template <class FunctionObject>
 589 void InvokeDagInitHandler(const FunctionObject* const Obj,
 590                           const Init* I, unsigned IndentLevel, raw_ostream& O)
 591 {
 592   typedef void (FunctionObject::*Handler)
 593     (const DagInit&, unsigned IndentLevel, raw_ostream& O) const;
 594
 595   const DagInit& Dag = InitPtrToDag(I);
 596   Handler h = GetHandler<Handler>(Obj, Dag);
 597
 598   ((Obj)->*(h))(Dag, IndentLevel, O);
 599 }
 600
 601 template <typename H>
 602 typename HandlerTable<H>::HandlerMap HandlerTable<H>::Handlers_;
 603
 604 template <typename H>
 605 bool HandlerTable<H>::staticMembersInitialized_ = false;
 606
 607
 608 /// CollectOptionProperties - Function object for iterating over an
 609 /// option property list.
 610 class CollectOptionProperties;
 611 typedef void (CollectOptionProperties::* CollectOptionPropertiesHandler)
 612 (const DagInit&);
 613
 614 class CollectOptionProperties
 615 : public HandlerTable<CollectOptionPropertiesHandler>
 616 {
 617 private:
 618
 619   /// optDescs_ - OptionDescriptions table. This is where the
 620   /// information is stored.
 621   OptionDescription& optDesc_;
 622
 623 public:
 624
 625   explicit CollectOptionProperties(OptionDescription& OD)
 626     : optDesc_(OD)
 627   {
 628     if (!staticMembersInitialized_) {
 629       AddHandler("help", &CollectOptionProperties::onHelp);
 630       AddHandler("hidden", &CollectOptionProperties::onHidden);
 631       AddHandler("init", &CollectOptionProperties::onInit);
 632       AddHandler("multi_val", &CollectOptionProperties::onMultiVal);
 633       AddHandler("one_or_more", &CollectOptionProperties::onOneOrMore);
 634       AddHandler("zero_or_more", &CollectOptionProperties::onZeroOrMore);
 635       AddHandler("really_hidden", &CollectOptionProperties::onReallyHidden);
 636       AddHandler("required", &CollectOptionProperties::onRequired);
 637       AddHandler("optional", &CollectOptionProperties::onOptional);
 638       AddHandler("comma_separated", &CollectOptionProperties::onCommaSeparated);
 639       AddHandler("forward_not_split",
 640                  &CollectOptionProperties::onForwardNotSplit);
 641
 642       staticMembersInitialized_ = true;
 643     }
 644   }
 645
 646   /// operator() - Just forwards to the corresponding property
 647   /// handler.
 648   void operator() (Init* I) {
 649     InvokeDagInitHandler(this, I);
 650   }
 651
 652 private:
 653
 654   /// Option property handlers --
 655   /// Methods that handle option properties such as (help) or (hidden).
 656
 657   void onHelp (const DagInit& d) {
 658     CheckNumberOfArguments(d, 1);
 659     optDesc_.Help = EscapeQuotes(InitPtrToString(d.getArg(0)));
 660   }
 661
 662   void onHidden (const DagInit& d) {
 663     CheckNumberOfArguments(d, 0);
 664     optDesc_.setHidden();
 665   }
 666
 667   void onReallyHidden (const DagInit& d) {
 668     CheckNumberOfArguments(d, 0);
 669     optDesc_.setReallyHidden();
 670   }
 671
 672   void onCommaSeparated (const DagInit& d) {
 673     CheckNumberOfArguments(d, 0);
 674     if (!optDesc_.isParameterList())
 675       throw "'comma_separated' is valid only on parameter list options!";
 676     optDesc_.setCommaSeparated();
 677   }
 678
 679   void onForwardNotSplit (const DagInit& d) {
 680     CheckNumberOfArguments(d, 0);
 681     if (!optDesc_.isParameter())
 682       throw "'forward_not_split' is valid only for parameter options!";
 683     optDesc_.setForwardNotSplit();
 684   }
 685
 686   void onRequired (const DagInit& d) {
 687     CheckNumberOfArguments(d, 0);
 688
 689     optDesc_.setRequired();
 690     optDesc_.CheckConsistency();
 691   }
 692
 693   void onInit (const DagInit& d) {
 694     CheckNumberOfArguments(d, 1);
 695     Init* i = d.getArg(0);
 696     const std::string& str = i->getAsString();
 697
 698     bool correct = optDesc_.isParameter() && dynamic_cast<StringInit*>(i);
 699     correct |= (optDesc_.isSwitch() && (str == "true" || str == "false"));
 700
 701     if (!correct)
 702       throw "Incorrect usage of the 'init' option property!";
 703
 704     optDesc_.InitVal = i;
 705   }
 706
 707   void onOneOrMore (const DagInit& d) {
 708     CheckNumberOfArguments(d, 0);
 709
 710     optDesc_.setOneOrMore();
 711     optDesc_.CheckConsistency();
 712   }
 713
 714   void onZeroOrMore (const DagInit& d) {
 715     CheckNumberOfArguments(d, 0);
 716
 717     if (optDesc_.isList())
 718       llvm::errs() << "Warning: specifying the 'zero_or_more' property "
 719         "on a list option has no effect.\n";
 720
 721     optDesc_.setZeroOrMore();
 722     optDesc_.CheckConsistency();
 723   }
 724
 725   void onOptional (const DagInit& d) {
 726     CheckNumberOfArguments(d, 0);
 727
 728     if (!optDesc_.isList())
 729       llvm::errs() << "Warning: specifying the 'optional' property"
 730         "on a non-list option has no effect.\n";
 731
 732     optDesc_.setOptional();
 733     optDesc_.CheckConsistency();
 734   }
 735
 736   void onMultiVal (const DagInit& d) {
 737     CheckNumberOfArguments(d, 1);
 738     int val = InitPtrToInt(d.getArg(0));
 739     if (val < 2)
 740       throw "Error in the 'multi_val' property: "
 741         "the value must be greater than 1!";
 742     if (!optDesc_.isParameterList())
 743       throw "The multi_val property is valid only on list options!";
 744     optDesc_.MultiVal = val;
 745   }
 746
 747 };
 748
 749 /// AddOption - A function object that is applied to every option
 750 /// description. Used by CollectOptionDescriptions.
 751 class AddOption {
 752 private:
 753   OptionDescriptions& OptDescs_;
 754
 755 public:
 756   explicit AddOption(OptionDescriptions& OD) : OptDescs_(OD)
 757   {}
 758
 759   void operator()(const Init* i) {
 760     const DagInit& d = InitPtrToDag(i);
 761     CheckNumberOfArguments(d, 1);
 762
 763     const OptionType::OptionType Type =
 764       stringToOptionType(GetOperatorName(d));
 765     const std::string& Name = InitPtrToString(d.getArg(0));
 766
 767     OptionDescription OD(Type, Name);
 768
 769     CheckNumberOfArguments(d, 2);
 770
 771     if (OD.isAlias()) {
 772       // Aliases store the aliased option name in the 'Help' field.
 773       OD.Help = InitPtrToString(d.getArg(1));
 774     }
 775     else {
 776       processOptionProperties(d, OD);
 777     }
 778
 779     OptDescs_.InsertDescription(OD);
 780   }
 781
 782 private:
 783   /// processOptionProperties - Go through the list of option
 784   /// properties and call a corresponding handler for each.
 785   static void processOptionProperties (const DagInit& d, OptionDescription& o) {
 786     CheckNumberOfArguments(d, 2);
 787     DagInit::const_arg_iterator B = d.arg_begin();
 788     // Skip the first argument: it's always the option name.
 789     ++B;
 790     std::for_each(B, d.arg_end(), CollectOptionProperties(o));
 791   }
 792
 793 };
 794
 795 /// CollectOptionDescriptions - Collects option properties from all
 796 /// OptionLists.
 797 void CollectOptionDescriptions (const RecordVector& V,
 798                                 OptionDescriptions& OptDescs)
 799 {
 800   // For every OptionList:
 801   for (RecordVector::const_iterator B = V.begin(), E = V.end(); B!=E; ++B)
 802   {
 803     // Throws an exception if the value does not exist.
 804     ListInit* PropList = (*B)->getValueAsListInit("options");
 805
 806     // For every option description in this list: invoke AddOption.
 807     std::for_each(PropList->begin(), PropList->end(), AddOption(OptDescs));
 808   }
 809 }
 810
 811 // Tool information record
 812
 813 namespace ToolFlags {
 814   enum ToolFlags { Join = 0x1, Sink = 0x2 };
 815 }
 816
 817 struct ToolDescription : public RefCountedBase<ToolDescription> {
 818   std::string Name;
 819   Init* CmdLine;
 820   Init* Actions;
 821   StrVector InLanguage;
 822   std::string InFileOption;
 823   std::string OutFileOption;
 824   StrVector OutLanguage;
 825   std::string OutputSuffix;
 826   unsigned Flags;
 827   const Init* OnEmpty;
 828
 829   // Various boolean properties
 830   void setSink()      { Flags |= ToolFlags::Sink; }
 831   bool isSink() const { return Flags & ToolFlags::Sink; }
 832   void setJoin()      { Flags |= ToolFlags::Join; }
 833   bool isJoin() const { return Flags & ToolFlags::Join; }
 834
 835   // Default ctor here is needed because StringMap can only store
 836   // DefaultConstructible objects
 837   ToolDescription (const std::string &n = "")
 838     : Name(n), CmdLine(0), Actions(0), OutFileOption("-o"),
 839       Flags(0), OnEmpty(0)
 840   {}
 841 };
 842
 843 /// ToolDescriptions - A list of Tool information records.
 844 typedef std::vector<IntrusiveRefCntPtr<ToolDescription> > ToolDescriptions;
 845
 846
 847 /// CollectToolProperties - Function object for iterating over a list of
 848 /// tool property records.
 849
 850 class CollectToolProperties;
 851 typedef void (CollectToolProperties::* CollectToolPropertiesHandler)
 852 (const DagInit&);
 853
 854 class CollectToolProperties : public HandlerTable<CollectToolPropertiesHandler>
 855 {
 856 private:
 857
 858   /// toolDesc_ - Properties of the current Tool. This is where the
 859   /// information is stored.
 860   ToolDescription& toolDesc_;
 861
 862 public:
 863
 864   explicit CollectToolProperties (ToolDescription& d)
 865     : toolDesc_(d)
 866   {
 867     if (!staticMembersInitialized_) {
 868
 869       AddHandler("actions", &CollectToolProperties::onActions);
 870       AddHandler("command", &CollectToolProperties::onCommand);
 871       AddHandler("in_language", &CollectToolProperties::onInLanguage);
 872       AddHandler("join", &CollectToolProperties::onJoin);
 873       AddHandler("out_language", &CollectToolProperties::onOutLanguage);
 874
 875       AddHandler("out_file_option", &CollectToolProperties::onOutFileOption);
 876       AddHandler("in_file_option", &CollectToolProperties::onInFileOption);
 877
 878       AddHandler("output_suffix", &CollectToolProperties::onOutputSuffix);
 879       AddHandler("sink", &CollectToolProperties::onSink);
 880       AddHandler("works_on_empty", &CollectToolProperties::onWorksOnEmpty);
 881
 882       staticMembersInitialized_ = true;
 883     }
 884   }
 885
 886   void operator() (Init* I) {
 887     InvokeDagInitHandler(this, I);
 888   }
 889
 890 private:
 891
 892   /// Property handlers --
 893   /// Functions that extract information about tool properties from
 894   /// DAG representation.
 895
 896   void onActions (const DagInit& d) {
 897     CheckNumberOfArguments(d, 1);
 898     Init* Case = d.getArg(0);
 899     if (typeid(*Case) != typeid(DagInit) ||
 900         GetOperatorName(static_cast<DagInit&>(*Case)) != "case")
 901       throw "The argument to (actions) should be a 'case' construct!";
 902     toolDesc_.Actions = Case;
 903   }
 904
 905   void onCommand (const DagInit& d) {
 906     CheckNumberOfArguments(d, 1);
 907     toolDesc_.CmdLine = d.getArg(0);
 908   }
 909
 910   /// onInOutLanguage - Common implementation of on{In,Out}Language().
 911   void onInOutLanguage (const DagInit& d, StrVector& OutVec) {
 912     CheckNumberOfArguments(d, 1);
 913
 914     // Copy strings to the output vector.
 915     for (unsigned i = 0, NumArgs = d.getNumArgs(); i < NumArgs; ++i) {
 916       OutVec.push_back(InitPtrToString(d.getArg(i)));
 917     }
 918
 919     // Remove duplicates.
 920     std::sort(OutVec.begin(), OutVec.end());
 921     StrVector::iterator newE = std::unique(OutVec.begin(), OutVec.end());
 922     OutVec.erase(newE, OutVec.end());
 923   }
 924
 925
 926   void onInLanguage (const DagInit& d) {
 927     this->onInOutLanguage(d, toolDesc_.InLanguage);
 928   }
 929
 930   void onJoin (const DagInit& d) {
 931     CheckNumberOfArguments(d, 0);
 932     toolDesc_.setJoin();
 933   }
 934
 935   void onOutLanguage (const DagInit& d) {
 936     this->onInOutLanguage(d, toolDesc_.OutLanguage);
 937   }
 938
 939   void onOutFileOption (const DagInit& d) {
 940     CheckNumberOfArguments(d, 1);
 941     toolDesc_.OutFileOption = InitPtrToString(d.getArg(0));
 942   }
 943
 944   void onInFileOption (const DagInit& d) {
 945     CheckNumberOfArguments(d, 1);
 946     toolDesc_.InFileOption = InitPtrToString(d.getArg(0));
 947   }
 948
 949   void onOutputSuffix (const DagInit& d) {
 950     CheckNumberOfArguments(d, 1);
 951     toolDesc_.OutputSuffix = InitPtrToString(d.getArg(0));
 952   }
 953
 954   void onSink (const DagInit& d) {
 955     CheckNumberOfArguments(d, 0);
 956     toolDesc_.setSink();
 957   }
 958
 959   void onWorksOnEmpty (const DagInit& d) {
 960     toolDesc_.OnEmpty = d.getArg(0);
 961   }
 962
 963 };
 964
 965 /// CollectToolDescriptions - Gather information about tool properties
 966 /// from the parsed TableGen data (basically a wrapper for the
 967 /// CollectToolProperties function object).
 968 void CollectToolDescriptions (const RecordVector& Tools,
 969                               ToolDescriptions& ToolDescs)
 970 {
 971   // Iterate over a properties list of every Tool definition
 972   for (RecordVector::const_iterator B = Tools.begin(),
 973          E = Tools.end(); B!=E; ++B) {
 974     const Record* T = *B;
 975     // Throws an exception if the value does not exist.
 976     ListInit* PropList = T->getValueAsListInit("properties");
 977
 978     IntrusiveRefCntPtr<ToolDescription>
 979       ToolDesc(new ToolDescription(T->getName()));
 980
 981     std::for_each(PropList->begin(), PropList->end(),
 982                   CollectToolProperties(*ToolDesc));
 983     ToolDescs.push_back(ToolDesc);
 984   }
 985 }
 986
 987 /// FillInEdgeVector - Merge all compilation graph definitions into
 988 /// one single edge list.
 989 void FillInEdgeVector(const RecordVector& CompilationGraphs,
 990                       DagVector& Out) {
 991   for (RecordVector::const_iterator B = CompilationGraphs.begin(),
 992          E = CompilationGraphs.end(); B != E; ++B) {
 993     const ListInit* Edges = (*B)->getValueAsListInit("edges");
 994
 995     for (ListInit::const_iterator B = Edges->begin(),
 996            E = Edges->end(); B != E; ++B) {
 997       Out.push_back(&InitPtrToDag(*B));
 998     }
 999   }
1000 }
1001
1002 /// NotInGraph - Helper function object for FilterNotInGraph.
1003 struct NotInGraph {
1004 private:
1005   const llvm::StringSet<>& ToolsInGraph_;
1006
1007 public:
1008   NotInGraph(const llvm::StringSet<>& ToolsInGraph)
1009   : ToolsInGraph_(ToolsInGraph)
1010   {}
1011
1012   bool operator()(const IntrusiveRefCntPtr<ToolDescription>& x) {
1013     return (ToolsInGraph_.count(x->Name) == 0);
1014   }
1015 };
1016
1017 /// FilterNotInGraph - Filter out from ToolDescs all Tools not
1018 /// mentioned in the compilation graph definition.
1019 void FilterNotInGraph (const DagVector& EdgeVector,
1020                        ToolDescriptions& ToolDescs) {
1021
1022   // List all tools mentioned in the graph.
1023   llvm::StringSet<> ToolsInGraph;
1024
1025   for (DagVector::const_iterator B = EdgeVector.begin(),
1026          E = EdgeVector.end(); B != E; ++B) {
1027
1028     const DagInit* Edge = *B;
1029     const std::string& NodeA = InitPtrToString(Edge->getArg(0));
1030     const std::string& NodeB = InitPtrToString(Edge->getArg(1));
1031
1032     if (NodeA != "root")
1033       ToolsInGraph.insert(NodeA);
1034     ToolsInGraph.insert(NodeB);
1035   }
1036
1037   // Filter ToolPropertiesList.
1038   ToolDescriptions::iterator new_end =
1039     std::remove_if(ToolDescs.begin(), ToolDescs.end(),
1040                    NotInGraph(ToolsInGraph));
1041   ToolDescs.erase(new_end, ToolDescs.end());
1042 }
1043
1044 /// FillInToolToLang - Fills in two tables that map tool names to
1045 /// input & output language names.  Helper function used by TypecheckGraph().
1046 void FillInToolToLang (const ToolDescriptions& ToolDescs,
1047                        StringMap<StringSet<> >& ToolToInLang,
1048                        StringMap<StringSet<> >& ToolToOutLang) {
1049   for (ToolDescriptions::const_iterator B = ToolDescs.begin(),
1050          E = ToolDescs.end(); B != E; ++B) {
1051     const ToolDescription& D = *(*B);
1052     for (StrVector::const_iterator B = D.InLanguage.begin(),
1053            E = D.InLanguage.end(); B != E; ++B)
1054       ToolToInLang[D.Name].insert(*B);
1055     for (StrVector::const_iterator B = D.OutLanguage.begin(),
1056            E = D.OutLanguage.end(); B != E; ++B)
1057       ToolToOutLang[D.Name].insert(*B);
1058   }
1059 }
1060
1061 /// Intersect - Is set intersection non-empty?
1062 bool Intersect (const StringSet<>& S1, const StringSet<>& S2) {
1063   for (StringSet<>::const_iterator B = S1.begin(), E = S1.end(); B != E; ++B) {
1064     if (S2.count(B->first()) != 0)
1065       return true;
1066   }
1067   return false;
1068 }
1069
1070 /// TypecheckGraph - Check that names for output and input languages
1071 /// on all edges do match.
1072 void TypecheckGraph (const DagVector& EdgeVector,
1073                      const ToolDescriptions& ToolDescs) {
1074   StringMap<StringSet<> > ToolToInLang;
1075   StringMap<StringSet<> > ToolToOutLang;
1076
1077   FillInToolToLang(ToolDescs, ToolToInLang, ToolToOutLang);
1078
1079   for (DagVector::const_iterator B = EdgeVector.begin(),
1080          E = EdgeVector.end(); B != E; ++B) {
1081     const DagInit* Edge = *B;
1082     const std::string& NodeA = InitPtrToString(Edge->getArg(0));
1083     const std::string& NodeB = InitPtrToString(Edge->getArg(1));
1084     StringMap<StringSet<> >::iterator IA = ToolToOutLang.find(NodeA);
1085     StringMap<StringSet<> >::iterator IB = ToolToInLang.find(NodeB);
1086
1087     if (NodeB == "root")
1088       throw "Edges back to the root are not allowed!";
1089
1090     if (NodeA != "root") {
1091       if (IA == ToolToOutLang.end())
1092         throw NodeA + ": no output language defined!";
1093       if (IB == ToolToInLang.end())
1094         throw NodeB + ": no input language defined!";
1095
1096       if (!Intersect(IA->second, IB->second)) {
1097         throw "Edge " + NodeA + "->" + NodeB
1098           + ": output->input language mismatch";
1099       }
1100     }
1101   }
1102 }
1103
1104 /// WalkCase - Walks the 'case' expression DAG and invokes
1105 /// TestCallback on every test, and StatementCallback on every
1106 /// statement. Handles 'case' nesting, but not the 'and' and 'or'
1107 /// combinators (that is, they are passed directly to TestCallback).
1108 /// TestCallback must have type 'void TestCallback(const DagInit*, unsigned
1109 /// IndentLevel, bool FirstTest)'.
1110 /// StatementCallback must have type 'void StatementCallback(const Init*,
1111 /// unsigned IndentLevel)'.
1112 template <typename F1, typename F2>
1113 void WalkCase(const Init* Case, F1 TestCallback, F2 StatementCallback,
1114               unsigned IndentLevel = 0)
1115 {
1116   const DagInit& d = InitPtrToDag(Case);
1117
1118   // Error checks.
1119   if (GetOperatorName(d) != "case")
1120     throw "WalkCase should be invoked only on 'case' expressions!";
1121
1122   if (d.getNumArgs() < 2)
1123     throw "There should be at least one clause in the 'case' expression:\n"
1124       + d.getAsString();
1125
1126   // Main loop.
1127   bool even = false;
1128   const unsigned numArgs = d.getNumArgs();
1129   unsigned i = 1;
1130   for (DagInit::const_arg_iterator B = d.arg_begin(), E = d.arg_end();
1131        B != E; ++B) {
1132     Init* arg = *B;
1133
1134     if (!even)
1135     {
1136       // Handle test.
1137       const DagInit& Test = InitPtrToDag(arg);
1138
1139       if (GetOperatorName(Test) == "default" && (i+1 != numArgs))
1140         throw "The 'default' clause should be the last in the "
1141           "'case' construct!";
1142       if (i == numArgs)
1143         throw "Case construct handler: no corresponding action "
1144           "found for the test " + Test.getAsString() + '!';
1145
1146       TestCallback(Test, IndentLevel, (i == 1));
1147     }
1148     else
1149     {
1150       if (dynamic_cast<DagInit*>(arg)
1151           && GetOperatorName(static_cast<DagInit&>(*arg)) == "case") {
1152         // Nested 'case'.
1153         WalkCase(arg, TestCallback, StatementCallback, IndentLevel + Indent1);
1154       }
1155
1156       // Handle statement.
1157       StatementCallback(arg, IndentLevel);
1158     }
1159
1160     ++i;
1161     even = !even;
1162   }
1163 }
1164
1165 /// ExtractOptionNames - A helper function object used by
1166 /// CheckForSuperfluousOptions() to walk the 'case' DAG.
1167 class ExtractOptionNames {
1168   llvm::StringSet<>& OptionNames_;
1169
1170   void processDag(const Init* Statement) {
1171     const DagInit& Stmt = InitPtrToDag(Statement);
1172     const std::string& ActionName = GetOperatorName(Stmt);
1173     if (ActionName == "forward" || ActionName == "forward_as" ||
1174         ActionName == "forward_value" ||
1175         ActionName == "forward_transformed_value" ||
1176         ActionName == "parameter_equals" || ActionName == "element_in_list") {
1177       CheckNumberOfArguments(Stmt, 1);
1178
1179       Init* Arg = Stmt.getArg(0);
1180       if (typeid(*Arg) == typeid(StringInit))
1181         OptionNames_.insert(InitPtrToString(Arg));
1182     }
1183     else if (ActionName == "any_switch_on" || ActionName == "switch_on" ||
1184              ActionName == "any_not_empty" || ActionName == "any_empty" ||
1185              ActionName == "not_empty" || ActionName == "empty") {
1186       for (unsigned i = 0, NumArgs = Stmt.getNumArgs(); i < NumArgs; ++i) {
1187         Init* Arg = Stmt.getArg(i);
1188         if (typeid(*Arg) == typeid(StringInit))
1189           OptionNames_.insert(InitPtrToString(Arg));
1190       }
1191     }
1192     else if (ActionName == "and" || ActionName == "or" || ActionName == "not") {
1193       for (unsigned i = 0, NumArgs = Stmt.getNumArgs(); i < NumArgs; ++i) {
1194         this->processDag(Stmt.getArg(i));
1195       }
1196     }
1197   }
1198
1199 public:
1200   ExtractOptionNames(llvm::StringSet<>& OptionNames) : OptionNames_(OptionNames)
1201   {}
1202
1203   void operator()(const Init* Statement) {
1204     // Statement is either a dag, or a list of dags.
1205     if (typeid(*Statement) == typeid(ListInit)) {
1206       const ListInit& DagList = *static_cast<const ListInit*>(Statement);
1207       for (ListInit::const_iterator B = DagList.begin(), E = DagList.end();
1208            B != E; ++B)
1209         this->processDag(*B);
1210     }
1211     else {
1212       this->processDag(Statement);
1213     }
1214   }
1215
1216   void operator()(const DagInit& Test, unsigned, bool) {
1217     this->operator()(&Test);
1218   }
1219   void operator()(const Init* Statement, unsigned) {
1220     this->operator()(Statement);
1221   }
1222 };
1223
1224 /// IsOptionalEdge - Validate that the 'optional_edge' has proper structure.
1225 bool IsOptionalEdge (const DagInit& Edg) {
1226   return (GetOperatorName(Edg) == "optional_edge") && (Edg.getNumArgs() > 2);
1227 }
1228
1229 /// CheckForSuperfluousOptions - Check that there are no side
1230 /// effect-free options (specified only in the OptionList). Otherwise,
1231 /// output a warning.
1232 void CheckForSuperfluousOptions (const DagVector& EdgeVector,
1233                                  const ToolDescriptions& ToolDescs,
1234                                  const OptionDescriptions& OptDescs) {
1235   llvm::StringSet<> nonSuperfluousOptions;
1236
1237   // Add all options mentioned in the ToolDesc.Actions to the set of
1238   // non-superfluous options.
1239   for (ToolDescriptions::const_iterator B = ToolDescs.begin(),
1240          E = ToolDescs.end(); B != E; ++B) {
1241     const ToolDescription& TD = *(*B);
1242     ExtractOptionNames Callback(nonSuperfluousOptions);
1243     if (TD.Actions)
1244       WalkCase(TD.Actions, Callback, Callback);
1245   }
1246
1247   // Add all options mentioned in the 'case' clauses of the
1248   // OptionalEdges of the compilation graph to the set of
1249   // non-superfluous options.
1250   for (DagVector::const_iterator B = EdgeVector.begin(),
1251          E = EdgeVector.end(); B != E; ++B) {
1252     const DagInit& Edge = **B;
1253     if (IsOptionalEdge(Edge)) {
1254       const DagInit& Weight = InitPtrToDag(Edge.getArg(2));
1255       WalkCase(&Weight, ExtractOptionNames(nonSuperfluousOptions), Id());
1256     }
1257   }
1258
1259   // Check that all options in OptDescs belong to the set of
1260   // non-superfluous options.
1261   for (OptionDescriptions::const_iterator B = OptDescs.begin(),
1262          E = OptDescs.end(); B != E; ++B) {
1263     const OptionDescription& Val = B->second;
1264     if (!nonSuperfluousOptions.count(Val.Name)
1265         && Val.Type != OptionType::Alias)
1266       llvm::errs() << "Warning: option '-" << Val.Name << "' has no effect! "
1267         "Probable cause: this option is specified only in the OptionList.\n";
1268   }
1269 }
1270
1271 /// EmitCaseTest0Args - Helper function used by EmitCaseConstructHandler().
1272 bool EmitCaseTest0Args(const std::string& TestName, raw_ostream& O) {
1273   if (TestName == "single_input_file") {
1274     O << "InputFilenames.size() == 1";
1275     return true;
1276   }
1277   else if (TestName == "multiple_input_files") {
1278     O << "InputFilenames.size() > 1";
1279     return true;
1280   }
1281
1282   return false;
1283 }
1284
1285 /// EmitMultipleArgumentTest - Helper function used by
1286 /// EmitCaseTestMultipleArgs()
1287 template <typename F>
1288 void EmitMultipleArgumentTest(const DagInit& D, const char* LogicOp,
1289                               F Callback, raw_ostream& O)
1290 {
1291   for (unsigned i = 0, NumArgs = D.getNumArgs(); i < NumArgs; ++i) {
1292     if (i != 0)
1293        O << ' ' << LogicOp << ' ';
1294     Callback(InitPtrToString(D.getArg(i)), O);
1295   }
1296 }
1297
1298 // Callbacks for use with EmitMultipleArgumentTest
1299
1300 class EmitSwitchOn {
1301   const OptionDescriptions& OptDescs_;
1302 public:
1303   EmitSwitchOn(const OptionDescriptions& OptDescs) : OptDescs_(OptDescs)
1304   {}
1305
1306   void operator()(const std::string& OptName, raw_ostream& O) const {
1307     const OptionDescription& OptDesc = OptDescs_.FindSwitch(OptName);
1308     O << OptDesc.GenVariableName();
1309   }
1310 };
1311
1312 class EmitEmptyTest {
1313   bool EmitNegate_;
1314   const OptionDescriptions& OptDescs_;
1315 public:
1316   EmitEmptyTest(bool EmitNegate, const OptionDescriptions& OptDescs)
1317     : EmitNegate_(EmitNegate), OptDescs_(OptDescs)
1318   {}
1319
1320   void operator()(const std::string& OptName, raw_ostream& O) const {
1321     const char* Neg = (EmitNegate_ ? "!" : "");
1322     if (OptName == "o") {
1323       O << Neg << "OutputFilename.empty()";
1324     }
1325     else if (OptName == "save-temps") {
1326       O << Neg << "(SaveTemps == SaveTempsEnum::Unset)";
1327     }
1328     else {
1329       const OptionDescription& OptDesc = OptDescs_.FindListOrParameter(OptName);
1330       O << Neg << OptDesc.GenVariableName() << ".empty()";
1331     }
1332   }
1333 };
1334
1335
1336 /// EmitCaseTestMultipleArgs - Helper function used by EmitCaseTest1Arg()
1337 bool EmitCaseTestMultipleArgs (const std::string& TestName,
1338                                const DagInit& d,
1339                                const OptionDescriptions& OptDescs,
1340                                raw_ostream& O) {
1341   if (TestName == "any_switch_on") {
1342     EmitMultipleArgumentTest(d, "||", EmitSwitchOn(OptDescs), O);
1343     return true;
1344   }
1345   else if (TestName == "switch_on") {
1346     EmitMultipleArgumentTest(d, "&&", EmitSwitchOn(OptDescs), O);
1347     return true;
1348   }
1349   else if (TestName == "any_not_empty") {
1350     EmitMultipleArgumentTest(d, "||", EmitEmptyTest(true, OptDescs), O);
1351     return true;
1352   }
1353   else if (TestName == "any_empty") {
1354     EmitMultipleArgumentTest(d, "||", EmitEmptyTest(false, OptDescs), O);
1355     return true;
1356   }
1357   else if (TestName == "not_empty") {
1358     EmitMultipleArgumentTest(d, "&&", EmitEmptyTest(true, OptDescs), O);
1359     return true;
1360   }
1361   else if (TestName == "empty") {
1362     EmitMultipleArgumentTest(d, "&&", EmitEmptyTest(false, OptDescs), O);
1363     return true;
1364   }
1365
1366   return false;
1367 }
1368
1369 /// EmitCaseTest1Arg - Helper function used by EmitCaseTest1OrMoreArgs()
1370 bool EmitCaseTest1Arg (const std::string& TestName,
1371                        const DagInit& d,
1372                        const OptionDescriptions& OptDescs,
1373                        raw_ostream& O) {
1374   const std::string& Arg = InitPtrToString(d.getArg(0));
1375
1376   if (TestName == "input_languages_contain") {
1377     O << "InLangs.count(\"" << Arg << "\") != 0";
1378     return true;
1379   }
1380   else if (TestName == "in_language") {
1381     // This works only for single-argument Tool::GenerateAction. Join
1382     // tools can process several files in different languages simultaneously.
1383
1384     // TODO: make this work with Edge::Weight (if possible).
1385     O << "LangMap.GetLanguage(inFile) == \"" << Arg << '\"';
1386     return true;
1387   }
1388
1389   return false;
1390 }
1391
1392 /// EmitCaseTest1OrMoreArgs - Helper function used by
1393 /// EmitCaseConstructHandler()
1394 bool EmitCaseTest1OrMoreArgs(const std::string& TestName,
1395                              const DagInit& d,
1396                              const OptionDescriptions& OptDescs,
1397                              raw_ostream& O) {
1398   CheckNumberOfArguments(d, 1);
1399   return EmitCaseTest1Arg(TestName, d, OptDescs, O) ||
1400     EmitCaseTestMultipleArgs(TestName, d, OptDescs, O);
1401 }
1402
1403 /// EmitCaseTest2Args - Helper function used by EmitCaseConstructHandler().
1404 bool EmitCaseTest2Args(const std::string& TestName,
1405                        const DagInit& d,
1406                        unsigned IndentLevel,
1407                        const OptionDescriptions& OptDescs,
1408                        raw_ostream& O) {
1409   CheckNumberOfArguments(d, 2);
1410   const std::string& OptName = InitPtrToString(d.getArg(0));
1411   const std::string& OptArg = InitPtrToString(d.getArg(1));
1412
1413   if (TestName == "parameter_equals") {
1414     const OptionDescription& OptDesc = OptDescs.FindParameter(OptName);
1415     O << OptDesc.GenVariableName() << " == \"" << OptArg << "\"";
1416     return true;
1417   }
1418   else if (TestName == "element_in_list") {
1419     const OptionDescription& OptDesc = OptDescs.FindParameterList(OptName);
1420     const std::string& VarName = OptDesc.GenVariableName();
1421     O << "std::find(" << VarName << ".begin(),\n";
1422     O.indent(IndentLevel + Indent1)
1423       << VarName << ".end(), \""
1424       << OptArg << "\") != " << VarName << ".end()";
1425     return true;
1426   }
1427
1428   return false;
1429 }
1430
1431 // Forward declaration.
1432 // EmitLogicalOperationTest and EmitCaseTest are mutually recursive.
1433 void EmitCaseTest(const DagInit& d, unsigned IndentLevel,
1434                   const OptionDescriptions& OptDescs,
1435                   raw_ostream& O);
1436
1437 /// EmitLogicalOperationTest - Helper function used by
1438 /// EmitCaseConstructHandler.
1439 void EmitLogicalOperationTest(const DagInit& d, const char* LogicOp,
1440                               unsigned IndentLevel,
1441                               const OptionDescriptions& OptDescs,
1442                               raw_ostream& O) {
1443   O << '(';
1444   for (unsigned i = 0, NumArgs = d.getNumArgs(); i < NumArgs; ++i) {
1445     const DagInit& InnerTest = InitPtrToDag(d.getArg(i));
1446     EmitCaseTest(InnerTest, IndentLevel, OptDescs, O);
1447     if (i != NumArgs - 1) {
1448       O << ")\n";
1449       O.indent(IndentLevel + Indent1) << ' ' << LogicOp << " (";
1450     }
1451     else {
1452       O << ')';
1453     }
1454   }
1455 }
1456
1457 void EmitLogicalNot(const DagInit& d, unsigned IndentLevel,
1458                     const OptionDescriptions& OptDescs, raw_ostream& O)
1459 {
1460   CheckNumberOfArguments(d, 1);
1461   const DagInit& InnerTest = InitPtrToDag(d.getArg(0));
1462   O << "! (";
1463   EmitCaseTest(InnerTest, IndentLevel, OptDescs, O);
1464   O << ")";
1465 }
1466
1467 /// EmitCaseTest - Helper function used by EmitCaseConstructHandler.
1468 void EmitCaseTest(const DagInit& d, unsigned IndentLevel,
1469                   const OptionDescriptions& OptDescs,
1470                   raw_ostream& O) {
1471   const std::string& TestName = GetOperatorName(d);
1472
1473   if (TestName == "and")
1474     EmitLogicalOperationTest(d, "&&", IndentLevel, OptDescs, O);
1475   else if (TestName == "or")
1476     EmitLogicalOperationTest(d, "||", IndentLevel, OptDescs, O);
1477   else if (TestName == "not")
1478     EmitLogicalNot(d, IndentLevel, OptDescs, O);
1479   else if (EmitCaseTest0Args(TestName, O))
1480     return;
1481   else if (EmitCaseTest1OrMoreArgs(TestName, d, OptDescs, O))
1482     return;
1483   else if (EmitCaseTest2Args(TestName, d, IndentLevel, OptDescs, O))
1484     return;
1485   else
1486     throw "Unknown test '" + TestName + "' used in the 'case' construct!";
1487 }
1488
1489
1490 /// EmitCaseTestCallback - Callback used by EmitCaseConstructHandler.
1491 class EmitCaseTestCallback {
1492   bool EmitElseIf_;
1493   const OptionDescriptions& OptDescs_;
1494   raw_ostream& O_;
1495 public:
1496
1497   EmitCaseTestCallback(bool EmitElseIf,
1498                        const OptionDescriptions& OptDescs, raw_ostream& O)
1499     : EmitElseIf_(EmitElseIf), OptDescs_(OptDescs), O_(O)
1500   {}
1501
1502   void operator()(const DagInit& Test, unsigned IndentLevel, bool FirstTest)
1503   {
1504     if (GetOperatorName(Test) == "default") {
1505       O_.indent(IndentLevel) << "else {\n";
1506     }
1507     else {
1508       O_.indent(IndentLevel)
1509         << ((!FirstTest && EmitElseIf_) ? "else if (" : "if (");
1510       EmitCaseTest(Test, IndentLevel, OptDescs_, O_);
1511       O_ << ") {\n";
1512     }
1513   }
1514 };
1515
1516 /// EmitCaseStatementCallback - Callback used by EmitCaseConstructHandler.
1517 template <typename F>
1518 class EmitCaseStatementCallback {
1519   F Callback_;
1520   raw_ostream& O_;
1521 public:
1522
1523   EmitCaseStatementCallback(F Callback, raw_ostream& O)
1524     : Callback_(Callback), O_(O)
1525   {}
1526
1527   void operator() (const Init* Statement, unsigned IndentLevel) {
1528     // Is this a nested 'case'?
1529     bool IsCase = dynamic_cast<const DagInit*>(Statement) &&
1530       GetOperatorName(static_cast<const DagInit&>(*Statement)) == "case";
1531
1532     // If so, ignore it, it is handled by our caller, WalkCase.
1533     if (!IsCase) {
1534       if (typeid(*Statement) == typeid(ListInit)) {
1535         const ListInit& DagList = *static_cast<const ListInit*>(Statement);
1536         for (ListInit::const_iterator B = DagList.begin(), E = DagList.end();
1537              B != E; ++B)
1538           Callback_(*B, (IndentLevel + Indent1), O_);
1539       }
1540       else {
1541         Callback_(Statement, (IndentLevel + Indent1), O_);
1542       }
1543     }
1544     O_.indent(IndentLevel) << "}\n";
1545   }
1546
1547 };
1548
1549 /// EmitCaseConstructHandler - Emit code that handles the 'case'
1550 /// construct. Takes a function object that should emit code for every case
1551 /// clause. Implemented on top of WalkCase.
1552 /// Callback's type is void F(const Init* Statement, unsigned IndentLevel,
1553 /// raw_ostream& O).
1554 /// EmitElseIf parameter controls the type of condition that is emitted ('if
1555 /// (..) {..} else if (..) {} .. else {..}' vs. 'if (..) {..} if(..)  {..}
1556 /// .. else {..}').
1557 template <typename F>
1558 void EmitCaseConstructHandler(const Init* Case, unsigned IndentLevel,
1559                               F Callback, bool EmitElseIf,
1560                               const OptionDescriptions& OptDescs,
1561                               raw_ostream& O) {
1562   WalkCase(Case, EmitCaseTestCallback(EmitElseIf, OptDescs, O),
1563            EmitCaseStatementCallback<F>(Callback, O), IndentLevel);
1564 }
1565
1566 /// TokenizeCmdLine - converts from
1567 /// "$CALL(HookName, 'Arg1', 'Arg2')/path -arg1 -arg2" to
1568 /// ["$CALL(", "HookName", "Arg1", "Arg2", ")/path", "-arg1", "-arg2"].
1569 void TokenizeCmdLine(const std::string& CmdLine, StrVector& Out) {
1570   const char* Delimiters = " \t\n\v\f\r";
1571   enum TokenizerState
1572   { Normal, SpecialCommand, InsideSpecialCommand, InsideQuotationMarks }
1573   cur_st  = Normal;
1574
1575   if (CmdLine.empty())
1576     return;
1577   Out.push_back("");
1578
1579   std::string::size_type B = CmdLine.find_first_not_of(Delimiters),
1580     E = CmdLine.size();
1581
1582   for (; B != E; ++B) {
1583     char cur_ch = CmdLine[B];
1584
1585     switch (cur_st) {
1586     case Normal:
1587       if (cur_ch == '$') {
1588         cur_st = SpecialCommand;
1589         break;
1590       }
1591       if (OneOf(Delimiters, cur_ch)) {
1592         // Skip whitespace
1593         B = CmdLine.find_first_not_of(Delimiters, B);
1594         if (B == std::string::npos) {
1595           B = E-1;
1596           continue;
1597         }
1598         --B;
1599         Out.push_back("");
1600         continue;
1601       }
1602       break;
1603
1604
1605     case SpecialCommand:
1606       if (OneOf(Delimiters, cur_ch)) {
1607         cur_st = Normal;
1608         Out.push_back("");
1609         continue;
1610       }
1611       if (cur_ch == '(') {
1612         Out.push_back("");
1613         cur_st = InsideSpecialCommand;
1614         continue;
1615       }
1616       break;
1617
1618     case InsideSpecialCommand:
1619       if (OneOf(Delimiters, cur_ch)) {
1620         continue;
1621       }
1622       if (cur_ch == '\'') {
1623         cur_st = InsideQuotationMarks;
1624         Out.push_back("");
1625         continue;
1626       }
1627       if (cur_ch == ')') {
1628         cur_st = Normal;
1629         Out.push_back("");
1630       }
1631       if (cur_ch == ',') {
1632         continue;
1633       }
1634
1635       break;
1636
1637     case InsideQuotationMarks:
1638       if (cur_ch == '\'') {
1639         cur_st = InsideSpecialCommand;
1640         continue;
1641       }
1642       break;
1643     }
1644
1645     Out.back().push_back(cur_ch);
1646   }
1647 }
1648
1649 /// SubstituteCall - Given "$CALL(HookName, [Arg1 [, Arg2 [...]]])", output
1650 /// "hooks::HookName([Arg1 [, Arg2 [, ...]]])". Helper function used by
1651 /// SubstituteSpecialCommands().
1652 StrVector::const_iterator
1653 SubstituteCall (StrVector::const_iterator Pos,
1654                 StrVector::const_iterator End,
1655                 bool IsJoin, raw_ostream& O)
1656 {
1657   const char* errorMessage = "Syntax error in $CALL invocation!";
1658   CheckedIncrement(Pos, End, errorMessage);
1659   const std::string& CmdName = *Pos;
1660
1661   if (CmdName == ")")
1662     throw "$CALL invocation: empty argument list!";
1663
1664   O << "hooks::";
1665   O << CmdName << "(";
1666
1667
1668   bool firstIteration = true;
1669   while (true) {
1670     CheckedIncrement(Pos, End, errorMessage);
1671     const std::string& Arg = *Pos;
1672     assert(Arg.size() != 0);
1673
1674     if (Arg[0] == ')')
1675       break;
1676
1677     if (firstIteration)
1678       firstIteration = false;
1679     else
1680       O << ", ";
1681
1682     if (Arg == "$INFILE") {
1683       if (IsJoin)
1684         throw "$CALL(Hook, $INFILE) can't be used with a Join tool!";
1685       else
1686         O << "inFile.c_str()";
1687     }
1688     else {
1689       O << '"' << Arg << '"';
1690     }
1691   }
1692
1693   O << ')';
1694
1695   return Pos;
1696 }
1697
1698 /// SubstituteEnv - Given '$ENV(VAR_NAME)', output 'getenv("VAR_NAME")'. Helper
1699 /// function used by SubstituteSpecialCommands().
1700 StrVector::const_iterator
1701 SubstituteEnv (StrVector::const_iterator Pos,
1702                StrVector::const_iterator End, raw_ostream& O)
1703 {
1704   const char* errorMessage = "Syntax error in $ENV invocation!";
1705   CheckedIncrement(Pos, End, errorMessage);
1706   const std::string& EnvName = *Pos;
1707
1708   if (EnvName == ")")
1709     throw "$ENV invocation: empty argument list!";
1710
1711   O << "checkCString(std::getenv(\"";
1712   O << EnvName;
1713   O << "\"))";
1714
1715   CheckedIncrement(Pos, End, errorMessage);
1716
1717   return Pos;
1718 }
1719
1720 /// SubstituteSpecialCommands - Given an invocation of $CALL or $ENV, output
1721 /// handler code. Helper function used by EmitCmdLineVecFill().
1722 StrVector::const_iterator
1723 SubstituteSpecialCommands (StrVector::const_iterator Pos,
1724                            StrVector::const_iterator End,
1725                            bool IsJoin, raw_ostream& O)
1726 {
1727
1728   const std::string& cmd = *Pos;
1729
1730   // Perform substitution.
1731   if (cmd == "$CALL") {
1732     Pos = SubstituteCall(Pos, End, IsJoin, O);
1733   }
1734   else if (cmd == "$ENV") {
1735     Pos = SubstituteEnv(Pos, End, O);
1736   }
1737   else {
1738     throw "Unknown special command: " + cmd;
1739   }
1740
1741   // Handle '$CMD(ARG)/additional/text'.
1742   const std::string& Leftover = *Pos;
1743   assert(Leftover.at(0) == ')');
1744   if (Leftover.size() != 1)
1745     O << " + std::string(\"" << (Leftover.c_str() + 1) << "\")";
1746
1747   return Pos;
1748 }
1749
1750 /// EmitCmdLineVecFill - Emit code that fills in the command line
1751 /// vector. Helper function used by EmitGenerateActionMethod().
1752 void EmitCmdLineVecFill(const Init* CmdLine, const std::string& ToolName,
1753                         bool IsJoin, unsigned IndentLevel,
1754                         raw_ostream& O) {
1755   StrVector StrVec;
1756   TokenizeCmdLine(InitPtrToString(CmdLine), StrVec);
1757
1758   if (StrVec.empty())
1759     throw "Tool '" + ToolName + "' has empty command line!";
1760
1761   StrVector::const_iterator B = StrVec.begin(), E = StrVec.end();
1762
1763   // Emit the command itself.
1764   assert(!StrVec[0].empty());
1765   O.indent(IndentLevel) << "cmd = ";
1766   if (StrVec[0][0] == '$') {
1767     B = SubstituteSpecialCommands(B, E, IsJoin, O);
1768     ++B;
1769   }
1770   else {
1771     O << '"' << StrVec[0] << '"';
1772     ++B;
1773   }
1774   O << ";\n";
1775
1776   // Go through the command arguments.
1777   assert(B <= E);
1778   for (; B != E; ++B) {
1779     const std::string& cmd = *B;
1780
1781     assert(!cmd.empty());
1782     O.indent(IndentLevel);
1783
1784     if (cmd.at(0) == '$') {
1785       O << "vec.push_back(std::make_pair(0, ";
1786       B = SubstituteSpecialCommands(B, E, IsJoin, O);
1787       O << "));\n";
1788     }
1789     else {
1790       O << "vec.push_back(std::make_pair(0, \"" << cmd << "\"));\n";
1791     }
1792   }
1793
1794 }
1795
1796 /// EmitForEachListElementCycleHeader - Emit common code for iterating through
1797 /// all elements of a list. Helper function used by
1798 /// EmitForwardOptionPropertyHandlingCode.
1799 void EmitForEachListElementCycleHeader (const OptionDescription& D,
1800                                         unsigned IndentLevel,
1801                                         raw_ostream& O) {
1802   unsigned IndentLevel1 = IndentLevel + Indent1;
1803
1804   O.indent(IndentLevel)
1805     << "for (" << D.GenTypeDeclaration()
1806     << "::iterator B = " << D.GenVariableName() << ".begin(),\n";
1807   O.indent(IndentLevel)
1808     << "E = " << D.GenVariableName() << ".end(); B != E;) {\n";
1809   O.indent(IndentLevel1) << "unsigned pos = " << D.GenVariableName()
1810                          << ".getPosition(B - " << D.GenVariableName()
1811                          << ".begin());\n";
1812 }
1813
1814 /// EmitForwardOptionPropertyHandlingCode - Helper function used to
1815 /// implement EmitActionHandler. Emits code for
1816 /// handling the (forward) and (forward_as) option properties.
1817 void EmitForwardOptionPropertyHandlingCode (const OptionDescription& D,
1818                                             unsigned IndentLevel,
1819                                             const std::string& NewName,
1820                                             raw_ostream& O) {
1821   const std::string& Name = NewName.empty()
1822     ? ("-" + D.Name)
1823     : NewName;
1824   unsigned IndentLevel1 = IndentLevel + Indent1;
1825
1826   switch (D.Type) {
1827   case OptionType::Switch:
1828     O.indent(IndentLevel)
1829       << "vec.push_back(std::make_pair(" << D.GenVariableName()
1830       << ".getPosition(), \"" << Name << "\"));\n";
1831     break;
1832   case OptionType::Parameter:
1833     O.indent(IndentLevel) << "vec.push_back(std::make_pair("
1834                           << D.GenVariableName()
1835                           <<".getPosition(), \"" << Name;
1836
1837     if (!D.isForwardNotSplit()) {
1838       O << "\"));\n";
1839       O.indent(IndentLevel) << "vec.push_back(std::make_pair("
1840                             << D.GenVariableName() << ".getPosition(), "
1841                             << D.GenVariableName() << "));\n";
1842     }
1843     else {
1844       O << "=\" + " << D.GenVariableName() << "));\n";
1845     }
1846     break;
1847   case OptionType::Prefix:
1848     O.indent(IndentLevel) << "vec.push_back(std::make_pair("
1849                           << D.GenVariableName() << ".getPosition(), \""
1850                           << Name << "\" + "
1851                           << D.GenVariableName() << "));\n";
1852     break;
1853   case OptionType::PrefixList:
1854     EmitForEachListElementCycleHeader(D, IndentLevel, O);
1855     O.indent(IndentLevel1) << "vec.push_back(std::make_pair(pos, \""
1856                            << Name << "\" + " << "*B));\n";
1857     O.indent(IndentLevel1) << "++B;\n";
1858
1859     for (int i = 1, j = D.MultiVal; i < j; ++i) {
1860       O.indent(IndentLevel1) << "vec.push_back(std::make_pair(pos, *B));\n";
1861       O.indent(IndentLevel1) << "++B;\n";
1862     }
1863
1864     O.indent(IndentLevel) << "}\n";
1865     break;
1866   case OptionType::ParameterList:
1867     EmitForEachListElementCycleHeader(D, IndentLevel, O);
1868     O.indent(IndentLevel1) << "vec.push_back(std::make_pair(pos, \""
1869                            << Name << "\"));\n";
1870
1871     for (int i = 0, j = D.MultiVal; i < j; ++i) {
1872       O.indent(IndentLevel1) << "vec.push_back(std::make_pair(pos, *B));\n";
1873       O.indent(IndentLevel1) << "++B;\n";
1874     }
1875
1876     O.indent(IndentLevel) << "}\n";
1877     break;
1878   case OptionType::SwitchList:
1879     EmitForEachListElementCycleHeader(D, IndentLevel, O);
1880     O.indent(IndentLevel1) << "vec.push_back(std::make_pair(pos, \""
1881                            << Name << "\"));\n";
1882     O.indent(IndentLevel1) << "++B;\n";
1883     O.indent(IndentLevel) << "}\n";
1884     break;
1885   case OptionType::Alias:
1886   default:
1887     throw "Aliases are not allowed in tool option descriptions!";
1888   }
1889 }
1890
1891 /// ActionHandlingCallbackBase - Base class of EmitActionHandlersCallback and
1892 /// EmitPreprocessOptionsCallback.
1893 struct ActionHandlingCallbackBase
1894 {
1895
1896   void onErrorDag(const DagInit& d,
1897                   unsigned IndentLevel, raw_ostream& O) const
1898   {
1899     O.indent(IndentLevel)
1900       << "PrintError(\""
1901       << (d.getNumArgs() >= 1 ? InitPtrToString(d.getArg(0)) : "Unknown error!")
1902       << "\");\n";
1903     O.indent(IndentLevel) << "return 1;\n";
1904   }
1905
1906   void onWarningDag(const DagInit& d,
1907                     unsigned IndentLevel, raw_ostream& O) const
1908   {
1909     CheckNumberOfArguments(d, 1);
1910     O.indent(IndentLevel) << "llvm::errs() << \""
1911                           << InitPtrToString(d.getArg(0)) << "\";\n";
1912   }
1913
1914 };
1915
1916 /// EmitActionHandlersCallback - Emit code that handles actions. Used by
1917 /// EmitGenerateActionMethod() as an argument to EmitCaseConstructHandler().
1918 class EmitActionHandlersCallback;
1919
1920 typedef void (EmitActionHandlersCallback::* EmitActionHandlersCallbackHandler)
1921 (const DagInit&, unsigned, raw_ostream&) const;
1922
1923 class EmitActionHandlersCallback :
1924   public ActionHandlingCallbackBase,
1925   public HandlerTable<EmitActionHandlersCallbackHandler>
1926 {
1927   typedef EmitActionHandlersCallbackHandler Handler;
1928
1929   const OptionDescriptions& OptDescs;
1930
1931   /// EmitHookInvocation - Common code for hook invocation from actions. Used by
1932   /// onAppendCmd and onOutputSuffix.
1933   void EmitHookInvocation(const std::string& Str,
1934                           const char* BlockOpen, const char* BlockClose,
1935                           unsigned IndentLevel, raw_ostream& O) const
1936   {
1937     StrVector Out;
1938     TokenizeCmdLine(Str, Out);
1939
1940     for (StrVector::const_iterator B = Out.begin(), E = Out.end();
1941          B != E; ++B) {
1942       const std::string& cmd = *B;
1943
1944       O.indent(IndentLevel) << BlockOpen;
1945
1946       if (cmd.at(0) == '$')
1947         B = SubstituteSpecialCommands(B, E,  /* IsJoin = */ true, O);
1948       else
1949         O << '"' << cmd << '"';
1950
1951       O << BlockClose;
1952     }
1953   }
1954
1955   void onAppendCmd (const DagInit& Dag,
1956                     unsigned IndentLevel, raw_ostream& O) const
1957   {
1958     CheckNumberOfArguments(Dag, 1);
1959     this->EmitHookInvocation(InitPtrToString(Dag.getArg(0)),
1960                              "vec.push_back(std::make_pair(65536, ", "));\n",
1961                              IndentLevel, O);
1962   }
1963
1964   void onForward (const DagInit& Dag,
1965                   unsigned IndentLevel, raw_ostream& O) const
1966   {
1967     CheckNumberOfArguments(Dag, 1);
1968     const std::string& Name = InitPtrToString(Dag.getArg(0));
1969     EmitForwardOptionPropertyHandlingCode(OptDescs.FindOption(Name),
1970                                           IndentLevel, "", O);
1971   }
1972
1973   void onForwardAs (const DagInit& Dag,
1974                     unsigned IndentLevel, raw_ostream& O) const
1975   {
1976     CheckNumberOfArguments(Dag, 2);
1977     const std::string& Name = InitPtrToString(Dag.getArg(0));
1978     const std::string& NewName = InitPtrToString(Dag.getArg(1));
1979     EmitForwardOptionPropertyHandlingCode(OptDescs.FindOption(Name),
1980                                           IndentLevel, NewName, O);
1981   }
1982
1983   void onForwardValue (const DagInit& Dag,
1984                        unsigned IndentLevel, raw_ostream& O) const
1985   {
1986     CheckNumberOfArguments(Dag, 1);
1987     const std::string& Name = InitPtrToString(Dag.getArg(0));
1988     const OptionDescription& D = OptDescs.FindParameterListOrParameter(Name);
1989
1990     if (D.isSwitchList()) {
1991       throw std::runtime_error
1992         ("forward_value is not allowed with switch_list");
1993     }
1994
1995     if (D.isParameter()) {
1996       O.indent(IndentLevel) << "vec.push_back(std::make_pair("
1997                             << D.GenVariableName() << ".getPosition(), "
1998                             << D.GenVariableName() << "));\n";
1999     }
2000     else {
2001       O.indent(IndentLevel) << "for (" << D.GenTypeDeclaration()
2002                             << "::iterator B = " << D.GenVariableName()
2003                             << ".begin(), \n";
2004       O.indent(IndentLevel + Indent1) << " E = " << D.GenVariableName()
2005                                       << ".end(); B != E; ++B)\n";
2006       O.indent(IndentLevel) << "{\n";
2007       O.indent(IndentLevel + Indent1)
2008         << "unsigned pos = " << D.GenVariableName()
2009         << ".getPosition(B - " << D.GenVariableName()
2010         << ".begin());\n";
2011       O.indent(IndentLevel + Indent1)
2012         << "vec.push_back(std::make_pair(pos, *B));\n";
2013       O.indent(IndentLevel) << "}\n";
2014     }
2015   }
2016
2017   void onForwardTransformedValue (const DagInit& Dag,
2018                                   unsigned IndentLevel, raw_ostream& O) const
2019   {
2020     CheckNumberOfArguments(Dag, 2);
2021     const std::string& Name = InitPtrToString(Dag.getArg(0));
2022     const std::string& Hook = InitPtrToString(Dag.getArg(1));
2023     const OptionDescription& D = OptDescs.FindParameterListOrParameter(Name);
2024
2025     O.indent(IndentLevel) << "vec.push_back(std::make_pair("
2026                           << D.GenVariableName() << ".getPosition("
2027                           << (D.isList() ? "0" : "") << "), "
2028                           << "hooks::" << Hook << "(" << D.GenVariableName()
2029                           << (D.isParameter() ? ".c_str()" : "") << ")));\n";
2030   }
2031
2032   void onNoOutFile (const DagInit& Dag,
2033                     unsigned IndentLevel, raw_ostream& O) const
2034   {
2035     CheckNumberOfArguments(Dag, 0);
2036     O.indent(IndentLevel) << "no_out_file = true;\n";
2037   }
2038
2039   void onOutputSuffix (const DagInit& Dag,
2040                        unsigned IndentLevel, raw_ostream& O) const
2041   {
2042     CheckNumberOfArguments(Dag, 1);
2043     this->EmitHookInvocation(InitPtrToString(Dag.getArg(0)),
2044                              "output_suffix = ", ";\n", IndentLevel, O);
2045   }
2046
2047   void onStopCompilation (const DagInit& Dag,
2048                           unsigned IndentLevel, raw_ostream& O) const
2049   {
2050     O.indent(IndentLevel) << "stop_compilation = true;\n";
2051   }
2052
2053
2054   void onUnpackValues (const DagInit& Dag,
2055                        unsigned IndentLevel, raw_ostream& O) const
2056   {
2057     throw "'unpack_values' is deprecated. "
2058       "Use 'comma_separated' + 'forward_value' instead!";
2059   }
2060
2061  public:
2062
2063   explicit EmitActionHandlersCallback(const OptionDescriptions& OD)
2064     : OptDescs(OD)
2065   {
2066     if (!staticMembersInitialized_) {
2067       AddHandler("error", &EmitActionHandlersCallback::onErrorDag);
2068       AddHandler("warning", &EmitActionHandlersCallback::onWarningDag);
2069       AddHandler("append_cmd", &EmitActionHandlersCallback::onAppendCmd);
2070       AddHandler("forward", &EmitActionHandlersCallback::onForward);
2071       AddHandler("forward_as", &EmitActionHandlersCallback::onForwardAs);
2072       AddHandler("forward_value", &EmitActionHandlersCallback::onForwardValue);
2073       AddHandler("forward_transformed_value",
2074                  &EmitActionHandlersCallback::onForwardTransformedValue);
2075       AddHandler("no_out_file",
2076                  &EmitActionHandlersCallback::onNoOutFile);
2077       AddHandler("output_suffix", &EmitActionHandlersCallback::onOutputSuffix);
2078       AddHandler("stop_compilation",
2079                  &EmitActionHandlersCallback::onStopCompilation);
2080       AddHandler("unpack_values",
2081                  &EmitActionHandlersCallback::onUnpackValues);
2082
2083
2084       staticMembersInitialized_ = true;
2085     }
2086   }
2087
2088   void operator()(const Init* I,
2089                   unsigned IndentLevel, raw_ostream& O) const
2090   {
2091     InvokeDagInitHandler(this, I, IndentLevel, O);
2092   }
2093 };
2094
2095 void EmitGenerateActionMethodHeader(const ToolDescription& D,
2096                                     bool IsJoin, bool Naked,
2097                                     raw_ostream& O)
2098 {
2099   O.indent(Indent1) << "int GenerateAction(Action& Out,\n";
2100
2101   if (IsJoin)
2102     O.indent(Indent2) << "const PathVector& inFiles,\n";
2103   else
2104     O.indent(Indent2) << "const sys::Path& inFile,\n";
2105
2106   O.indent(Indent2) << "const bool HasChildren,\n";
2107   O.indent(Indent2) << "const llvm::sys::Path& TempDir,\n";
2108   O.indent(Indent2) << "const InputLanguagesSet& InLangs,\n";
2109   O.indent(Indent2) << "const LanguageMap& LangMap) const\n";
2110   O.indent(Indent1) << "{\n";
2111
2112   if (!Naked) {
2113     O.indent(Indent2) << "std::string cmd;\n";
2114     O.indent(Indent2) << "std::string out_file;\n";
2115     O.indent(Indent2)
2116       << "std::vector<std::pair<unsigned, std::string> > vec;\n";
2117     O.indent(Indent2) << "bool stop_compilation = !HasChildren;\n";
2118     O.indent(Indent2) << "bool no_out_file = false;\n";
2119     O.indent(Indent2) << "std::string output_suffix(\""
2120                       << D.OutputSuffix << "\");\n";
2121   }
2122 }
2123
2124 // EmitGenerateActionMethod - Emit either a normal or a "join" version of the
2125 // Tool::GenerateAction() method.
2126 void EmitGenerateActionMethod (const ToolDescription& D,
2127                                const OptionDescriptions& OptDescs,
2128                                bool IsJoin, raw_ostream& O) {
2129
2130   EmitGenerateActionMethodHeader(D, IsJoin, /* Naked = */ false, O);
2131
2132   if (!D.CmdLine)
2133     throw "Tool " + D.Name + " has no cmd_line property!";
2134
2135   // Process the 'command' property.
2136   O << '\n';
2137   EmitCmdLineVecFill(D.CmdLine, D.Name, IsJoin, Indent2, O);
2138   O << '\n';
2139
2140   // Process the 'actions' list of this tool.
2141   if (D.Actions)
2142     EmitCaseConstructHandler(D.Actions, Indent2,
2143                              EmitActionHandlersCallback(OptDescs),
2144                              false, OptDescs, O);
2145   O << '\n';
2146
2147   // Input file (s)
2148   if (!D.InFileOption.empty()) {
2149     O.indent(Indent2)
2150       << "vec.push_back(std::make_pair(InputFilenames.getPosition(0), \""
2151       << D.InFileOption << "\");\n";
2152   }
2153
2154   if (IsJoin) {
2155     O.indent(Indent2)
2156       << "for (PathVector::const_iterator B = inFiles.begin(),\n";
2157     O.indent(Indent3) << "E = inFiles.end(); B != E; ++B)\n";
2158     O.indent(Indent2) << "{\n";
2159     O.indent(Indent3) << "vec.push_back(std::make_pair("
2160                       << "InputFilenames.getPosition(B - inFiles.begin()), "
2161                       << "B->str()));\n";
2162     O.indent(Indent2) << "}\n";
2163   }
2164   else {
2165     O.indent(Indent2) << "vec.push_back(std::make_pair("
2166                       << "InputFilenames.getPosition(0), inFile.str()));\n";
2167   }
2168
2169   // Output file
2170   O.indent(Indent2) << "if (!no_out_file) {\n";
2171   if (!D.OutFileOption.empty())
2172     O.indent(Indent3) << "vec.push_back(std::make_pair(65536, \""
2173                       << D.OutFileOption << "\"));\n";
2174
2175   O.indent(Indent3) << "out_file = this->OutFilename("
2176                     << (IsJoin ? "sys::Path(),\n" : "inFile,\n");
2177   O.indent(Indent4) <<
2178     "TempDir, stop_compilation, output_suffix.c_str()).str();\n\n";
2179   O.indent(Indent3) << "vec.push_back(std::make_pair(65536, out_file));\n";
2180
2181   O.indent(Indent2) << "}\n\n";
2182
2183   // Handle the Sink property.
2184   std::string SinkOption("autogenerated::");
2185   SinkOption += SinkOptionName;
2186   if (D.isSink()) {
2187     O.indent(Indent2) << "if (!" << SinkOption << ".empty()) {\n";
2188     O.indent(Indent3) << "for (cl::list<std::string>::iterator B = "
2189                       << SinkOption << ".begin(), E = " << SinkOption
2190                       << ".end(); B != E; ++B)\n";
2191     O.indent(Indent4) << "vec.push_back(std::make_pair(" << SinkOption
2192                       << ".getPosition(B - " << SinkOption
2193                       <<  ".begin()), *B));\n";
2194     O.indent(Indent2) << "}\n";
2195   }
2196
2197   O.indent(Indent2) << "Out.Construct(cmd, this->SortArgs(vec), "
2198                     << "stop_compilation, out_file);\n";
2199   O.indent(Indent2) << "return 0;\n";
2200   O.indent(Indent1) << "}\n\n";
2201 }
2202
2203 /// EmitGenerateActionMethods - Emit two GenerateAction() methods for
2204 /// a given Tool class.
2205 void EmitGenerateActionMethods (const ToolDescription& ToolDesc,
2206                                 const OptionDescriptions& OptDescs,
2207                                 raw_ostream& O) {
2208   if (!ToolDesc.isJoin()) {
2209     EmitGenerateActionMethodHeader(ToolDesc, /* IsJoin = */ true,
2210                                    /* Naked = */ true, O);
2211     O.indent(Indent2) << "PrintError(\"" << ToolDesc.Name
2212                       << " is not a Join tool!\");\n";
2213     O.indent(Indent2) << "return -1;\n";
2214     O.indent(Indent1) << "}\n\n";
2215   }
2216   else {
2217     EmitGenerateActionMethod(ToolDesc, OptDescs, true, O);
2218   }
2219
2220   EmitGenerateActionMethod(ToolDesc, OptDescs, false, O);
2221 }
2222
2223 /// EmitInOutLanguageMethods - Emit the [Input,Output]Language()
2224 /// methods for a given Tool class.
2225 void EmitInOutLanguageMethods (const ToolDescription& D, raw_ostream& O) {
2226   O.indent(Indent1) << "const char** InputLanguages() const {\n";
2227   O.indent(Indent2) << "return InputLanguages_;\n";
2228   O.indent(Indent1) << "}\n\n";
2229
2230   O.indent(Indent1) << "const char** OutputLanguages() const {\n";
2231   O.indent(Indent2) << "return OutputLanguages_;\n";
2232   O.indent(Indent1) << "}\n\n";
2233 }
2234
2235 /// EmitNameMethod - Emit the Name() method for a given Tool class.
2236 void EmitNameMethod (const ToolDescription& D, raw_ostream& O) {
2237   O.indent(Indent1) << "const char* Name() const {\n";
2238   O.indent(Indent2) << "return \"" << D.Name << "\";\n";
2239   O.indent(Indent1) << "}\n\n";
2240 }
2241
2242 /// EmitIsJoinMethod - Emit the IsJoin() method for a given Tool
2243 /// class.
2244 void EmitIsJoinMethod (const ToolDescription& D, raw_ostream& O) {
2245   O.indent(Indent1) << "bool IsJoin() const {\n";
2246   if (D.isJoin())
2247     O.indent(Indent2) << "return true;\n";
2248   else
2249     O.indent(Indent2) << "return false;\n";
2250   O.indent(Indent1) << "}\n\n";
2251 }
2252
2253 /// EmitWorksOnEmptyCallback - Callback used by EmitWorksOnEmptyMethod in
2254 /// conjunction with EmitCaseConstructHandler.
2255 void EmitWorksOnEmptyCallback (const Init* Value,
2256                                unsigned IndentLevel, raw_ostream& O) {
2257   CheckBooleanConstant(Value);
2258   O.indent(IndentLevel) << "return " << Value->getAsString() << ";\n";
2259 }
2260
2261 /// EmitWorksOnEmptyMethod - Emit the WorksOnEmpty() method for a given Tool
2262 /// class.
2263 void EmitWorksOnEmptyMethod (const ToolDescription& D,
2264                              const OptionDescriptions& OptDescs,
2265                              raw_ostream& O)
2266 {
2267   O.indent(Indent1) << "bool WorksOnEmpty() const {\n";
2268   if (D.OnEmpty == 0)
2269     O.indent(Indent2) << "return false;\n";
2270   else
2271     EmitCaseConstructHandler(D.OnEmpty, Indent2, EmitWorksOnEmptyCallback,
2272                              /*EmitElseIf = */ true, OptDescs, O);
2273   O.indent(Indent1) << "}\n\n";
2274 }
2275
2276 /// EmitStrArray - Emit definition of a 'const char**' static member
2277 /// variable. Helper used by EmitStaticMemberDefinitions();
2278 void EmitStrArray(const std::string& Name, const std::string& VarName,
2279                   const StrVector& StrVec, raw_ostream& O) {
2280   O << "const char* " << Name << "::" << VarName << "[] = {";
2281   for (StrVector::const_iterator B = StrVec.begin(), E = StrVec.end();
2282        B != E; ++B)
2283     O << '\"' << *B << "\", ";
2284   O << "0};\n";
2285 }
2286
2287 /// EmitStaticMemberDefinitions - Emit static member definitions for a
2288 /// given Tool class.
2289 void EmitStaticMemberDefinitions(const ToolDescription& D, raw_ostream& O) {
2290   if (D.InLanguage.empty())
2291     throw "Tool " + D.Name + " has no 'in_language' property!";
2292   if (D.OutLanguage.empty())
2293     throw "Tool " + D.Name + " has no 'out_language' property!";
2294
2295   EmitStrArray(D.Name, "InputLanguages_", D.InLanguage, O);
2296   EmitStrArray(D.Name, "OutputLanguages_", D.OutLanguage, O);
2297   O << '\n';
2298 }
2299
2300 /// EmitToolClassDefinition - Emit a Tool class definition.
2301 void EmitToolClassDefinition (const ToolDescription& D,
2302                               const OptionDescriptions& OptDescs,
2303                               raw_ostream& O) {
2304   if (D.Name == "root")
2305     return;
2306
2307   // Header
2308   O << "class " << D.Name << " : public ";
2309   if (D.isJoin())
2310     O << "JoinTool";
2311   else
2312     O << "Tool";
2313
2314   O << " {\nprivate:\n";
2315   O.indent(Indent1) << "static const char* InputLanguages_[];\n";
2316   O.indent(Indent1) << "static const char* OutputLanguages_[];\n\n";
2317
2318   O << "public:\n";
2319   EmitNameMethod(D, O);
2320   EmitInOutLanguageMethods(D, O);
2321   EmitIsJoinMethod(D, O);
2322   EmitWorksOnEmptyMethod(D, OptDescs, O);
2323   EmitGenerateActionMethods(D, OptDescs, O);
2324
2325   // Close class definition
2326   O << "};\n";
2327
2328   EmitStaticMemberDefinitions(D, O);
2329
2330 }
2331
2332 /// EmitOptionDefinitions - Iterate over a list of option descriptions
2333 /// and emit registration code.
2334 void EmitOptionDefinitions (const OptionDescriptions& descs,
2335                             bool HasSink, raw_ostream& O)
2336 {
2337   std::vector<OptionDescription> Aliases;
2338
2339   // Emit static cl::Option variables.
2340   for (OptionDescriptions::const_iterator B = descs.begin(),
2341          E = descs.end(); B!=E; ++B) {
2342     const OptionDescription& val = B->second;
2343
2344     if (val.Type == OptionType::Alias) {
2345       Aliases.push_back(val);
2346       continue;
2347     }
2348
2349     O << val.GenTypeDeclaration() << ' '
2350       << val.GenPlainVariableName();
2351
2352     O << "(\"" << val.Name << "\"\n";
2353
2354     if (val.Type == OptionType::Prefix || val.Type == OptionType::PrefixList)
2355       O << ", cl::Prefix";
2356
2357     if (val.isRequired()) {
2358       if (val.isList() && !val.isMultiVal())
2359         O << ", cl::OneOrMore";
2360       else
2361         O << ", cl::Required";
2362     }
2363
2364     if (val.isOptional())
2365         O << ", cl::Optional";
2366
2367     if (val.isOneOrMore())
2368         O << ", cl::OneOrMore";
2369
2370     if (val.isZeroOrMore())
2371         O << ", cl::ZeroOrMore";
2372
2373     if (val.isReallyHidden())
2374       O << ", cl::ReallyHidden";
2375     else if (val.isHidden())
2376       O << ", cl::Hidden";
2377
2378     if (val.isCommaSeparated())
2379       O << ", cl::CommaSeparated";
2380
2381     if (val.MultiVal > 1)
2382       O << ", cl::multi_val(" << val.MultiVal << ')';
2383
2384     if (val.InitVal) {
2385       const std::string& str = val.InitVal->getAsString();
2386       O << ", cl::init(" << str << ')';
2387     }
2388
2389     if (!val.Help.empty())
2390       O << ", cl::desc(\"" << val.Help << "\")";
2391
2392     O << ");\n\n";
2393   }
2394
2395   // Emit the aliases (they should go after all the 'proper' options).
2396   for (std::vector<OptionDescription>::const_iterator
2397          B = Aliases.begin(), E = Aliases.end(); B != E; ++B) {
2398     const OptionDescription& val = *B;
2399
2400     O << val.GenTypeDeclaration() << ' '
2401       << val.GenPlainVariableName()
2402       << "(\"" << val.Name << '\"';
2403
2404     const OptionDescription& D = descs.FindOption(val.Help);
2405     O << ", cl::aliasopt(" << D.GenVariableName() << ")";
2406
2407     O << ", cl::desc(\"" << "An alias for -" + val.Help  << "\"));\n";
2408   }
2409
2410   // Emit the sink option.
2411   if (HasSink)
2412     O << "cl::list<std::string> " << SinkOptionName << "(cl::Sink);\n";
2413
2414   O << '\n';
2415 }
2416
2417 /// EmitPreprocessOptionsCallback - Helper function passed to
2418 /// EmitCaseConstructHandler() by EmitPreprocessOptions().
2419
2420 class EmitPreprocessOptionsCallback;
2421
2422 typedef void
2423 (EmitPreprocessOptionsCallback::* EmitPreprocessOptionsCallbackHandler)
2424 (const DagInit&, unsigned, raw_ostream&) const;
2425
2426 class EmitPreprocessOptionsCallback :
2427   public ActionHandlingCallbackBase,
2428   public HandlerTable<EmitPreprocessOptionsCallbackHandler>
2429 {
2430   typedef EmitPreprocessOptionsCallbackHandler Handler;
2431   typedef void
2432   (EmitPreprocessOptionsCallback::* HandlerImpl)
2433   (const Init*, unsigned, raw_ostream&) const;
2434
2435   const OptionDescriptions& OptDescs_;
2436
2437   void onEachArgument(const DagInit& d, HandlerImpl h,
2438                       unsigned IndentLevel, raw_ostream& O) const
2439   {
2440     CheckNumberOfArguments(d, 1);
2441
2442     for (unsigned i = 0, NumArgs = d.getNumArgs(); i < NumArgs; ++i) {
2443       ((this)->*(h))(d.getArg(i), IndentLevel, O);
2444     }
2445   }
2446
2447   void onUnsetOptionImpl(const Init* I,
2448                          unsigned IndentLevel, raw_ostream& O) const
2449   {
2450     const std::string& OptName = InitPtrToString(I);
2451     const OptionDescription& OptDesc = OptDescs_.FindOption(OptName);
2452
2453     if (OptDesc.isSwitch()) {
2454       O.indent(IndentLevel) << OptDesc.GenVariableName() << " = false;\n";
2455     }
2456     else if (OptDesc.isParameter()) {
2457       O.indent(IndentLevel) << OptDesc.GenVariableName() << " = \"\";\n";
2458     }
2459     else if (OptDesc.isList()) {
2460       O.indent(IndentLevel) << OptDesc.GenVariableName() << ".clear();\n";
2461     }
2462     else {
2463       throw "Can't apply 'unset_option' to alias option '" + OptName + "'!";
2464     }
2465   }
2466
2467   void onUnsetOption(const DagInit& d,
2468                      unsigned IndentLevel, raw_ostream& O) const
2469   {
2470     this->onEachArgument(d, &EmitPreprocessOptionsCallback::onUnsetOptionImpl,
2471                          IndentLevel, O);
2472   }
2473
2474   void onSetOptionImpl(const DagInit& D,
2475                        unsigned IndentLevel, raw_ostream& O) const {
2476     CheckNumberOfArguments(D, 2);
2477
2478     const std::string& OptName = InitPtrToString(D.getArg(0));
2479     const OptionDescription& OptDesc = OptDescs_.FindOption(OptName);
2480     const Init* Value = D.getArg(1);
2481
2482     if (OptDesc.isList()) {
2483       const ListInit& List = InitPtrToList(Value);
2484
2485       O.indent(IndentLevel) << OptDesc.GenVariableName() << ".clear();\n";
2486       for (ListInit::const_iterator B = List.begin(), E = List.end();
2487            B != E; ++B) {
2488         const Init* CurElem = *B;
2489         if (OptDesc.isSwitchList())
2490           CheckBooleanConstant(CurElem);
2491
2492         O.indent(IndentLevel)
2493           << OptDesc.GenVariableName() << ".push_back(\""
2494           << (OptDesc.isSwitchList() ? CurElem->getAsString()
2495               : InitPtrToString(CurElem))
2496           << "\");\n";
2497       }
2498     }
2499     else if (OptDesc.isSwitch()) {
2500       CheckBooleanConstant(Value);
2501       O.indent(IndentLevel) << OptDesc.GenVariableName()
2502                             << " = " << Value->getAsString() << ";\n";
2503     }
2504     else if (OptDesc.isParameter()) {
2505       const std::string& Str = InitPtrToString(Value);
2506       O.indent(IndentLevel) << OptDesc.GenVariableName()
2507                             << " = \"" << Str << "\";\n";
2508     }
2509     else {
2510       throw "Can't apply 'set_option' to alias option '" + OptName + "'!";
2511     }
2512   }
2513
2514   void onSetSwitch(const Init* I,
2515                    unsigned IndentLevel, raw_ostream& O) const {
2516     const std::string& OptName = InitPtrToString(I);
2517     const OptionDescription& OptDesc = OptDescs_.FindOption(OptName);
2518
2519     if (OptDesc.isSwitch())
2520       O.indent(IndentLevel) << OptDesc.GenVariableName() << " = true;\n";
2521     else
2522       throw "set_option: -" + OptName + " is not a switch option!";
2523   }
2524
2525   void onSetOption(const DagInit& d,
2526                    unsigned IndentLevel, raw_ostream& O) const
2527   {
2528     CheckNumberOfArguments(d, 1);
2529
2530     // 2-argument form: (set_option "A", true), (set_option "B", "C"),
2531     // (set_option "D", ["E", "F"])
2532     if (d.getNumArgs() == 2) {
2533       const OptionDescription& OptDesc =
2534         OptDescs_.FindOption(InitPtrToString(d.getArg(0)));
2535       const Init* Opt2 = d.getArg(1);
2536
2537       if (!OptDesc.isSwitch() || typeid(*Opt2) != typeid(StringInit)) {
2538         this->onSetOptionImpl(d, IndentLevel, O);
2539         return;
2540       }
2541     }
2542
2543     // Multiple argument form: (set_option "A"), (set_option "B", "C", "D")
2544     this->onEachArgument(d, &EmitPreprocessOptionsCallback::onSetSwitch,
2545                          IndentLevel, O);
2546   }
2547
2548 public:
2549
2550   EmitPreprocessOptionsCallback(const OptionDescriptions& OptDescs)
2551   : OptDescs_(OptDescs)
2552   {
2553     if (!staticMembersInitialized_) {
2554       AddHandler("error", &EmitPreprocessOptionsCallback::onErrorDag);
2555       AddHandler("warning", &EmitPreprocessOptionsCallback::onWarningDag);
2556       AddHandler("unset_option", &EmitPreprocessOptionsCallback::onUnsetOption);
2557       AddHandler("set_option", &EmitPreprocessOptionsCallback::onSetOption);
2558
2559       staticMembersInitialized_ = true;
2560     }
2561   }
2562
2563   void operator()(const Init* I,
2564                   unsigned IndentLevel, raw_ostream& O) const
2565   {
2566     InvokeDagInitHandler(this, I, IndentLevel, O);
2567   }
2568
2569 };
2570
2571 /// EmitPreprocessOptions - Emit the PreprocessOptions() function.
2572 void EmitPreprocessOptions (const RecordKeeper& Records,
2573                             const OptionDescriptions& OptDecs, raw_ostream& O)
2574 {
2575   O << "int PreprocessOptions () {\n";
2576
2577   const RecordVector& OptionPreprocessors =
2578     Records.getAllDerivedDefinitions("OptionPreprocessor");
2579
2580   for (RecordVector::const_iterator B = OptionPreprocessors.begin(),
2581          E = OptionPreprocessors.end(); B!=E; ++B) {
2582     DagInit* Case = (*B)->getValueAsDag("preprocessor");
2583     EmitCaseConstructHandler(Case, Indent1,
2584                              EmitPreprocessOptionsCallback(OptDecs),
2585                              false, OptDecs, O);
2586   }
2587
2588   O << '\n';
2589   O.indent(Indent1) << "return 0;\n";
2590   O << "}\n\n";
2591 }
2592
2593 class DoEmitPopulateLanguageMap;
2594 typedef void (DoEmitPopulateLanguageMap::* DoEmitPopulateLanguageMapHandler)
2595 (const DagInit& D);
2596
2597 class DoEmitPopulateLanguageMap
2598 : public HandlerTable<DoEmitPopulateLanguageMapHandler>
2599 {
2600 private:
2601   raw_ostream& O_;
2602
2603 public:
2604
2605   explicit DoEmitPopulateLanguageMap (raw_ostream& O) : O_(O) {
2606     if (!staticMembersInitialized_) {
2607       AddHandler("lang_to_suffixes",
2608                  &DoEmitPopulateLanguageMap::onLangToSuffixes);
2609
2610       staticMembersInitialized_ = true;
2611     }
2612   }
2613
2614   void operator() (Init* I) {
2615     InvokeDagInitHandler(this, I);
2616   }
2617
2618 private:
2619
2620   void onLangToSuffixes (const DagInit& d) {
2621     CheckNumberOfArguments(d, 2);
2622
2623     const std::string& Lang = InitPtrToString(d.getArg(0));
2624     Init* Suffixes = d.getArg(1);
2625
2626     // Second argument to lang_to_suffixes is either a single string...
2627     if (typeid(*Suffixes) == typeid(StringInit)) {
2628       O_.indent(Indent1) << "langMap[\"" << InitPtrToString(Suffixes)
2629                          << "\"] = \"" << Lang << "\";\n";
2630     }
2631     // ...or a list of strings.
2632     else {
2633       const ListInit& Lst = InitPtrToList(Suffixes);
2634       assert(Lst.size() != 0);
2635       for (ListInit::const_iterator B = Lst.begin(), E = Lst.end();
2636            B != E; ++B) {
2637         O_.indent(Indent1) << "langMap[\"" << InitPtrToString(*B)
2638                            << "\"] = \"" << Lang << "\";\n";
2639       }
2640     }
2641   }
2642
2643 };
2644
2645 /// EmitPopulateLanguageMap - Emit the PopulateLanguageMap() function.
2646 void EmitPopulateLanguageMap (const RecordKeeper& Records, raw_ostream& O)
2647 {
2648   O << "int PopulateLanguageMap (LanguageMap& langMap) {\n";
2649
2650   // For each LanguageMap:
2651   const RecordVector& LangMaps =
2652     Records.getAllDerivedDefinitions("LanguageMap");
2653
2654   // Call DoEmitPopulateLanguageMap.
2655   for (RecordVector::const_iterator B = LangMaps.begin(),
2656          E = LangMaps.end(); B!=E; ++B) {
2657     ListInit* LangMap = (*B)->getValueAsListInit("map");
2658     std::for_each(LangMap->begin(), LangMap->end(),
2659                   DoEmitPopulateLanguageMap(O));
2660   }
2661
2662   O << '\n';
2663   O.indent(Indent1) << "return 0;\n";
2664   O << "}\n\n";
2665 }
2666
2667 /// EmitEdgePropertyHandlerCallback - Emits code that handles edge
2668 /// properties. Helper function passed to EmitCaseConstructHandler() by
2669 /// EmitEdgeClass().
2670 void EmitEdgePropertyHandlerCallback (const Init* i, unsigned IndentLevel,
2671                                       raw_ostream& O) {
2672   const DagInit& d = InitPtrToDag(i);
2673   const std::string& OpName = GetOperatorName(d);
2674
2675   if (OpName == "inc_weight") {
2676     O.indent(IndentLevel) << "ret += ";
2677   }
2678   else if (OpName == "error") {
2679     CheckNumberOfArguments(d, 1);
2680     O.indent(IndentLevel) << "PrintError(\""
2681                           << InitPtrToString(d.getArg(0))
2682                           << "\");\n";
2683     O.indent(IndentLevel) << "return -1;\n";
2684     return;
2685   }
2686   else {
2687     throw "Unknown operator in edge properties list: '" + OpName + "'!"
2688       "\nOnly 'inc_weight', 'dec_weight' and 'error' are allowed.";
2689   }
2690
2691   if (d.getNumArgs() > 0)
2692     O << InitPtrToInt(d.getArg(0)) << ";\n";
2693   else
2694     O << "2;\n";
2695
2696 }
2697
2698 /// EmitEdgeClass - Emit a single Edge# class.
2699 void EmitEdgeClass (unsigned N, const std::string& Target,
2700                     const DagInit& Case, const OptionDescriptions& OptDescs,
2701                     raw_ostream& O) {
2702
2703   // Class constructor.
2704   O << "class Edge" << N << ": public Edge {\n"
2705     << "public:\n";
2706   O.indent(Indent1) << "Edge" << N << "() : Edge(\"" << Target
2707                     << "\") {}\n\n";
2708
2709   // Function Weight().
2710   O.indent(Indent1)
2711     << "int Weight(const InputLanguagesSet& InLangs) const {\n";
2712   O.indent(Indent2) << "unsigned ret = 0;\n";
2713
2714   // Handle the 'case' construct.
2715   EmitCaseConstructHandler(&Case, Indent2, EmitEdgePropertyHandlerCallback,
2716                            false, OptDescs, O);
2717
2718   O.indent(Indent2) << "return ret;\n";
2719   O.indent(Indent1) << "}\n\n};\n\n";
2720 }
2721
2722 /// EmitEdgeClasses - Emit Edge* classes that represent graph edges.
2723 void EmitEdgeClasses (const DagVector& EdgeVector,
2724                       const OptionDescriptions& OptDescs,
2725                       raw_ostream& O) {
2726   int i = 0;
2727   for (DagVector::const_iterator B = EdgeVector.begin(),
2728          E = EdgeVector.end(); B != E; ++B) {
2729     const DagInit& Edge = **B;
2730     const std::string& Name = GetOperatorName(Edge);
2731
2732     if (Name == "optional_edge") {
2733       assert(IsOptionalEdge(Edge));
2734       const std::string& NodeB = InitPtrToString(Edge.getArg(1));
2735
2736       const DagInit& Weight = InitPtrToDag(Edge.getArg(2));
2737       EmitEdgeClass(i, NodeB, Weight, OptDescs, O);
2738     }
2739     else if (Name != "edge") {
2740       throw "Unknown edge class: '" + Name + "'!";
2741     }
2742
2743     ++i;
2744   }
2745 }
2746
2747 /// EmitPopulateCompilationGraph - Emit the PopulateCompilationGraph() function.
2748 void EmitPopulateCompilationGraph (const DagVector& EdgeVector,
2749                                    const ToolDescriptions& ToolDescs,
2750                                    raw_ostream& O)
2751 {
2752   O << "int PopulateCompilationGraph (CompilationGraph& G) {\n";
2753
2754   for (ToolDescriptions::const_iterator B = ToolDescs.begin(),
2755          E = ToolDescs.end(); B != E; ++B)
2756     O.indent(Indent1) << "G.insertNode(new " << (*B)->Name << "());\n";
2757
2758   O << '\n';
2759
2760   // Insert edges.
2761
2762   int i = 0;
2763   for (DagVector::const_iterator B = EdgeVector.begin(),
2764          E = EdgeVector.end(); B != E; ++B) {
2765     const DagInit& Edge = **B;
2766     const std::string& NodeA = InitPtrToString(Edge.getArg(0));
2767     const std::string& NodeB = InitPtrToString(Edge.getArg(1));
2768
2769     O.indent(Indent1) << "if (int ret = G.insertEdge(\"" << NodeA << "\", ";
2770
2771     if (IsOptionalEdge(Edge))
2772       O << "new Edge" << i << "()";
2773     else
2774       O << "new SimpleEdge(\"" << NodeB << "\")";
2775
2776     O << "))\n";
2777     O.indent(Indent2) << "return ret;\n";
2778
2779     ++i;
2780   }
2781
2782   O << '\n';
2783   O.indent(Indent1) << "return 0;\n";
2784   O << "}\n\n";
2785 }
2786
2787 /// HookInfo - Information about the hook type and number of arguments.
2788 struct HookInfo {
2789
2790   // A hook can either have a single parameter of type std::vector<std::string>,
2791   // or NumArgs parameters of type const char*.
2792   enum HookType { ListHook, ArgHook };
2793
2794   HookType Type;
2795   unsigned NumArgs;
2796
2797   HookInfo() : Type(ArgHook), NumArgs(1)
2798   {}
2799
2800   HookInfo(HookType T) : Type(T), NumArgs(1)
2801   {}
2802
2803   HookInfo(unsigned N) : Type(ArgHook), NumArgs(N)
2804   {}
2805 };
2806
2807 typedef llvm::StringMap<HookInfo> HookInfoMap;
2808
2809 /// ExtractHookNames - Extract the hook names from all instances of
2810 /// $CALL(HookName) in the provided command line string/action. Helper
2811 /// function used by FillInHookNames().
2812 class ExtractHookNames {
2813   HookInfoMap& HookNames_;
2814   const OptionDescriptions& OptDescs_;
2815 public:
2816   ExtractHookNames(HookInfoMap& HookNames, const OptionDescriptions& OptDescs)
2817     : HookNames_(HookNames), OptDescs_(OptDescs)
2818   {}
2819
2820   void onAction (const DagInit& Dag) {
2821     const std::string& Name = GetOperatorName(Dag);
2822
2823     if (Name == "forward_transformed_value") {
2824       CheckNumberOfArguments(Dag, 2);
2825       const std::string& OptName = InitPtrToString(Dag.getArg(0));
2826       const std::string& HookName = InitPtrToString(Dag.getArg(1));
2827       const OptionDescription& D =
2828         OptDescs_.FindParameterListOrParameter(OptName);
2829
2830       HookNames_[HookName] = HookInfo(D.isList() ? HookInfo::ListHook
2831                                       : HookInfo::ArgHook);
2832     }
2833     else if (Name == "append_cmd" || Name == "output_suffix") {
2834       CheckNumberOfArguments(Dag, 1);
2835       this->onCmdLine(InitPtrToString(Dag.getArg(0)));
2836     }
2837   }
2838
2839   void onCmdLine(const std::string& Cmd) {
2840     StrVector cmds;
2841     TokenizeCmdLine(Cmd, cmds);
2842
2843     for (StrVector::const_iterator B = cmds.begin(), E = cmds.end();
2844          B != E; ++B) {
2845       const std::string& cmd = *B;
2846
2847       if (cmd == "$CALL") {
2848         unsigned NumArgs = 0;
2849         CheckedIncrement(B, E, "Syntax error in $CALL invocation!");
2850         const std::string& HookName = *B;
2851
2852         if (HookName.at(0) == ')')
2853           throw "$CALL invoked with no arguments!";
2854
2855         while (++B != E && B->at(0) != ')') {
2856           ++NumArgs;
2857         }
2858
2859         HookInfoMap::const_iterator H = HookNames_.find(HookName);
2860
2861         if (H != HookNames_.end() && H->second.NumArgs != NumArgs &&
2862             H->second.Type != HookInfo::ArgHook)
2863           throw "Overloading of hooks is not allowed. Overloaded hook: "
2864             + HookName;
2865         else
2866           HookNames_[HookName] = HookInfo(NumArgs);
2867       }
2868     }
2869   }
2870
2871   void operator()(const Init* Arg) {
2872
2873     // We're invoked on an action (either a dag or a dag list).
2874     if (typeid(*Arg) == typeid(DagInit)) {
2875       const DagInit& Dag = InitPtrToDag(Arg);
2876       this->onAction(Dag);
2877       return;
2878     }
2879     else if (typeid(*Arg) == typeid(ListInit)) {
2880       const ListInit& List = InitPtrToList(Arg);
2881       for (ListInit::const_iterator B = List.begin(), E = List.end(); B != E;
2882            ++B) {
2883         const DagInit& Dag = InitPtrToDag(*B);
2884         this->onAction(Dag);
2885       }
2886       return;
2887     }
2888
2889     // We're invoked on a command line string.
2890     this->onCmdLine(InitPtrToString(Arg));
2891   }
2892
2893   void operator()(const Init* Statement, unsigned) {
2894     this->operator()(Statement);
2895   }
2896 };
2897
2898 /// FillInHookNames - Actually extract the hook names from all command
2899 /// line strings. Helper function used by EmitHookDeclarations().
2900 void FillInHookNames(const ToolDescriptions& ToolDescs,
2901                      const OptionDescriptions& OptDescs,
2902                      HookInfoMap& HookNames)
2903 {
2904   // For all tool descriptions:
2905   for (ToolDescriptions::const_iterator B = ToolDescs.begin(),
2906          E = ToolDescs.end(); B != E; ++B) {
2907     const ToolDescription& D = *(*B);
2908
2909     // Look for 'forward_transformed_value' in 'actions'.
2910     if (D.Actions)
2911       WalkCase(D.Actions, Id(), ExtractHookNames(HookNames, OptDescs));
2912
2913     // Look for hook invocations in 'cmd_line'.
2914     if (!D.CmdLine)
2915       continue;
2916     if (dynamic_cast<StringInit*>(D.CmdLine))
2917       // This is a string.
2918       ExtractHookNames(HookNames, OptDescs).operator()(D.CmdLine);
2919     else
2920       // This is a 'case' construct.
2921       WalkCase(D.CmdLine, Id(), ExtractHookNames(HookNames, OptDescs));
2922   }
2923 }
2924
2925 /// EmitHookDeclarations - Parse CmdLine fields of all the tool
2926 /// property records and emit hook function declaration for each
2927 /// instance of $CALL(HookName).
2928 void EmitHookDeclarations(const ToolDescriptions& ToolDescs,
2929                           const OptionDescriptions& OptDescs, raw_ostream& O) {
2930   HookInfoMap HookNames;
2931
2932   FillInHookNames(ToolDescs, OptDescs, HookNames);
2933   if (HookNames.empty())
2934     return;
2935
2936   for (HookInfoMap::const_iterator B = HookNames.begin(),
2937          E = HookNames.end(); B != E; ++B) {
2938     const char* HookName = B->first();
2939     const HookInfo& Info = B->second;
2940
2941     O.indent(Indent1) << "std::string " << HookName << "(";
2942
2943     if (Info.Type == HookInfo::ArgHook) {
2944       for (unsigned i = 0, j = Info.NumArgs; i < j; ++i) {
2945         O << "const char* Arg" << i << (i+1 == j ? "" : ", ");
2946       }
2947     }
2948     else {
2949       O << "const std::vector<std::string>& Arg";
2950     }
2951
2952     O <<");\n";
2953   }
2954 }
2955
2956 /// EmitIncludes - Emit necessary #include directives and some
2957 /// additional declarations.
2958 void EmitIncludes(raw_ostream& O) {
2959   O << "#include \"llvm/CompilerDriver/BuiltinOptions.h\"\n"
2960     << "#include \"llvm/CompilerDriver/CompilationGraph.h\"\n"
2961     << "#include \"llvm/CompilerDriver/Error.h\"\n"
2962     << "#include \"llvm/CompilerDriver/Tool.h\"\n\n"
2963
2964     << "#include \"llvm/Support/CommandLine.h\"\n"
2965     << "#include \"llvm/Support/raw_ostream.h\"\n\n"
2966
2967     << "#include <algorithm>\n"
2968     << "#include <cstdlib>\n"
2969     << "#include <iterator>\n"
2970     << "#include <stdexcept>\n\n"
2971
2972     << "using namespace llvm;\n"
2973     << "using namespace llvmc;\n\n"
2974
2975     << "inline const char* checkCString(const char* s)\n"
2976     << "{ return s == NULL ? \"\" : s; }\n\n";
2977 }
2978
2979
2980 /// DriverData - Holds all information about the driver.
2981 struct DriverData {
2982   OptionDescriptions OptDescs;
2983   ToolDescriptions ToolDescs;
2984   DagVector Edges;
2985   bool HasSink;
2986 };
2987
2988 /// HasSink - Go through the list of tool descriptions and check if
2989 /// there are any with the 'sink' property set.
2990 bool HasSink(const ToolDescriptions& ToolDescs) {
2991   for (ToolDescriptions::const_iterator B = ToolDescs.begin(),
2992          E = ToolDescs.end(); B != E; ++B)
2993     if ((*B)->isSink())
2994       return true;
2995
2996   return false;
2997 }
2998
2999 /// CollectDriverData - Collect compilation graph edges, tool properties and
3000 /// option properties from the parse tree.
3001 void CollectDriverData (const RecordKeeper& Records, DriverData& Data) {
3002   // Collect option properties.
3003   const RecordVector& OptionLists =
3004     Records.getAllDerivedDefinitions("OptionList");
3005   CollectOptionDescriptions(OptionLists, Data.OptDescs);
3006
3007   // Collect tool properties.
3008   const RecordVector& Tools = Records.getAllDerivedDefinitions("Tool");
3009   CollectToolDescriptions(Tools, Data.ToolDescs);
3010   Data.HasSink = HasSink(Data.ToolDescs);
3011
3012   // Collect compilation graph edges.
3013   const RecordVector& CompilationGraphs =
3014     Records.getAllDerivedDefinitions("CompilationGraph");
3015   FillInEdgeVector(CompilationGraphs, Data.Edges);
3016 }
3017
3018 /// CheckDriverData - Perform some sanity checks on the collected data.
3019 void CheckDriverData(DriverData& Data) {
3020   // Filter out all tools not mentioned in the compilation graph.
3021   FilterNotInGraph(Data.Edges, Data.ToolDescs);
3022
3023   // Typecheck the compilation graph.
3024   TypecheckGraph(Data.Edges, Data.ToolDescs);
3025
3026   // Check that there are no options without side effects (specified
3027   // only in the OptionList).
3028   CheckForSuperfluousOptions(Data.Edges, Data.ToolDescs, Data.OptDescs);
3029 }
3030
3031 void EmitDriverCode(const DriverData& Data, raw_ostream& O) {
3032   // Emit file header.
3033   EmitIncludes(O);
3034
3035   // Emit global option registration code.
3036   O << "namespace llvmc {\n"
3037     << "namespace autogenerated {\n\n";
3038   EmitOptionDefinitions(Data.OptDescs, Data.HasSink, O);
3039   O << "} // End namespace autogenerated.\n"
3040     << "} // End namespace llvmc.\n\n";
3041
3042   // Emit hook declarations.
3043   O << "namespace hooks {\n";
3044   EmitHookDeclarations(Data.ToolDescs, Data.OptDescs, O);
3045   O << "} // End namespace hooks.\n\n";
3046
3047   O << "namespace {\n\n";
3048   O << "using namespace llvmc::autogenerated;\n\n";
3049
3050   // Emit Tool classes.
3051   for (ToolDescriptions::const_iterator B = Data.ToolDescs.begin(),
3052          E = Data.ToolDescs.end(); B!=E; ++B)
3053     EmitToolClassDefinition(*(*B), Data.OptDescs, O);
3054
3055   // Emit Edge# classes.
3056   EmitEdgeClasses(Data.Edges, Data.OptDescs, O);
3057
3058   O << "} // End anonymous namespace.\n\n";
3059
3060   O << "namespace llvmc {\n";
3061   O << "namespace autogenerated {\n\n";
3062
3063   // Emit PreprocessOptions() function.
3064   EmitPreprocessOptions(Records, Data.OptDescs, O);
3065
3066   // Emit PopulateLanguageMap() function
3067   // (language map maps from file extensions to language names).
3068   EmitPopulateLanguageMap(Records, O);
3069
3070   // Emit PopulateCompilationGraph() function.
3071   EmitPopulateCompilationGraph(Data.Edges, Data.ToolDescs, O);
3072
3073   O << "} // End namespace autogenerated.\n";
3074   O << "} // End namespace llvmc.\n\n";
3075
3076   // EOF
3077 }
3078
3079
3080 // End of anonymous namespace
3081 }
3082
3083 /// run - The back-end entry point.
3084 void LLVMCConfigurationEmitter::run (raw_ostream &O) {
3085   try {
3086     DriverData Data;
3087
3088     CollectDriverData(Records, Data);
3089     CheckDriverData(Data);
3090
3091     this->EmitSourceFileHeader("llvmc-based driver: auto-generated code", O);
3092     EmitDriverCode(Data, O);
3093
3094   } catch (std::exception& Error) {
3095     throw Error.what() + std::string(" - usually this means a syntax error.");
3096   }
3097 }