utils/TableGen/OptParserEmitter.cpp

   1 //===- OptParserEmitter.cpp - Table Driven Command Line Parsing -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "OptParserEmitter.h"
  11 #include "Record.h"
  12 #include "llvm/ADT/STLExtras.h"
  13 using namespace llvm;
  14
  15 static int StrCmpOptionName(const char *A, const char *B) {
  16   char a = *A, b = *B;
  17   while (a == b) {
  18     if (a == '\0')
  19       return 0;
  20
  21     a = *++A;
  22     b = *++B;
  23   }
  24
  25   if (a == '\0') // A is a prefix of B.
  26     return 1;
  27   if (b == '\0') // B is a prefix of A.
  28     return -1;
  29
  30   // Otherwise lexicographic.
  31   return (a < b) ? -1 : 1;
  32 }
  33
  34 static int CompareOptionRecords(const void *Av, const void *Bv) {
  35   const Record *A = *(Record**) Av;
  36   const Record *B = *(Record**) Bv;
  37
  38   // Sentinel options preceed all others and are only ordered by precedence.
  39   bool ASent = A->getValueAsDef("Kind")->getValueAsBit("Sentinel");
  40   bool BSent = B->getValueAsDef("Kind")->getValueAsBit("Sentinel");
  41   if (ASent != BSent)
  42     return ASent ? -1 : 1;
  43
  44   // Compare options by name, unless they are sentinels.
  45   if (!ASent)
  46     if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").c_str(),
  47                                    B->getValueAsString("Name").c_str()))
  48     return Cmp;
  49
  50   // Then by the kind precedence;
  51   int APrec = A->getValueAsDef("Kind")->getValueAsInt("Precedence");
  52   int BPrec = B->getValueAsDef("Kind")->getValueAsInt("Precedence");
  53   assert(APrec != BPrec && "Options are equivalent!");
  54   return APrec < BPrec ? -1 : 1;
  55 }
  56
  57 static const std::string getOptionName(const Record &R) {
  58   // Use the record name unless EnumName is defined.
  59   if (dynamic_cast<UnsetInit*>(R.getValueInit("EnumName")))
  60     return R.getName();
  61
  62   return R.getValueAsString("EnumName");
  63 }
  64
  65 static raw_ostream &write_cstring(raw_ostream &OS, llvm::StringRef Str) {
  66   OS << '"';
  67   OS.write_escaped(Str);
  68   OS << '"';
  69   return OS;
  70 }
  71
  72 void OptParserEmitter::run(raw_ostream &OS) {
  73   // Get the option groups and options.
  74   const std::vector<Record*> &Groups =
  75     Records.getAllDerivedDefinitions("OptionGroup");
  76   std::vector<Record*> Opts = Records.getAllDerivedDefinitions("Option");
  77
  78   if (GenDefs)
  79     EmitSourceFileHeader("Option Parsing Definitions", OS);
  80   else
  81     EmitSourceFileHeader("Option Parsing Table", OS);
  82
  83   array_pod_sort(Opts.begin(), Opts.end(), CompareOptionRecords);
  84   if (GenDefs) {
  85     OS << "#ifndef OPTION\n";
  86     OS << "#error \"Define OPTION prior to including this file!\"\n";
  87     OS << "#endif\n\n";
  88
  89     OS << "/////////\n";
  90     OS << "// Groups\n\n";
  91     for (unsigned i = 0, e = Groups.size(); i != e; ++i) {
  92       const Record &R = *Groups[i];
  93
  94       // Start a single option entry.
  95       OS << "OPTION(";
  96
  97       // The option string.
  98       OS << '"' << R.getValueAsString("Name") << '"';
  99
 100       // The option identifier name.
 101       OS  << ", "<< getOptionName(R);
 102
 103       // The option kind.
 104       OS << ", Group";
 105
 106       // The containing option group (if any).
 107       OS << ", ";
 108       if (const DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Group")))
 109         OS << getOptionName(*DI->getDef());
 110       else
 111         OS << "INVALID";
 112
 113       // The other option arguments (unused for groups).
 114       OS << ", INVALID, 0, 0";
 115
 116       // The option help text.
 117       if (!dynamic_cast<UnsetInit*>(R.getValueInit("HelpText"))) {
 118         OS << ",\n";
 119         OS << "       ";
 120         write_cstring(OS, R.getValueAsString("HelpText"));
 121       } else
 122         OS << ", 0";
 123
 124       // The option meta-variable name (unused).
 125       OS << ", 0)\n";
 126     }
 127     OS << "\n";
 128
 129     OS << "//////////\n";
 130     OS << "// Options\n\n";
 131     for (unsigned i = 0, e = Opts.size(); i != e; ++i) {
 132       const Record &R = *Opts[i];
 133
 134       // Start a single option entry.
 135       OS << "OPTION(";
 136
 137       // The option string.
 138       write_cstring(OS, R.getValueAsString("Name"));
 139
 140       // The option identifier name.
 141       OS  << ", "<< getOptionName(R);
 142
 143       // The option kind.
 144       OS << ", " << R.getValueAsDef("Kind")->getValueAsString("Name");
 145
 146       // The containing option group (if any).
 147       OS << ", ";
 148       if (const DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Group")))
 149         OS << getOptionName(*DI->getDef());
 150       else
 151         OS << "INVALID";
 152
 153       // The option alias (if any).
 154       OS << ", ";
 155       if (const DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Alias")))
 156         OS << getOptionName(*DI->getDef());
 157       else
 158         OS << "INVALID";
 159
 160       // The option flags.
 161       const ListInit *LI = R.getValueAsListInit("Flags");
 162       if (LI->empty()) {
 163         OS << ", 0";
 164       } else {
 165         OS << ", ";
 166         for (unsigned i = 0, e = LI->size(); i != e; ++i) {
 167           if (i)
 168             OS << " | ";
 169           OS << dynamic_cast<DefInit*>(LI->getElement(i))->getDef()->getName();
 170         }
 171       }
 172
 173       // The option parameter field.
 174       OS << ", " << R.getValueAsInt("NumArgs");
 175
 176       // The option help text.
 177       if (!dynamic_cast<UnsetInit*>(R.getValueInit("HelpText"))) {
 178         OS << ",\n";
 179         OS << "       ";
 180         write_cstring(OS, R.getValueAsString("HelpText"));
 181       } else
 182         OS << ", 0";
 183
 184       // The option meta-variable name.
 185       OS << ", ";
 186       if (!dynamic_cast<UnsetInit*>(R.getValueInit("MetaVarName")))
 187         write_cstring(OS, R.getValueAsString("MetaVarName"));
 188       else
 189         OS << "0";
 190
 191       OS << ")\n";
 192     }
 193   }
 194 }