utils/TableGen/ClangDiagnosticsEmitter.cpp

   1 //=- ClangDiagnosticsEmitter.cpp - Generate Clang diagnostics tables -*- C++ -*-
   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 // These tablegen backends emit Clang diagnostics tables.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ClangDiagnosticsEmitter.h"
  15 #include "Record.h"
  16 #include "llvm/Support/Debug.h"
  17 #include "llvm/Support/Compiler.h"
  18 #include "llvm/ADT/DenseSet.h"
  19 #include "llvm/ADT/StringExtras.h"
  20 #include "llvm/ADT/VectorExtras.h"
  21 #include <set>
  22 #include <map>
  23 using namespace llvm;
  24
  25 //===----------------------------------------------------------------------===//
  26 // Warning Tables (.inc file) generation.
  27 //===----------------------------------------------------------------------===//
  28
  29 void ClangDiagsDefsEmitter::run(raw_ostream &OS) {
  30   // Write the #if guard
  31   if (!Component.empty()) {
  32     std::string ComponentName = UppercaseString(Component);
  33     OS << "#ifdef " << ComponentName << "START\n";
  34     OS << "__" << ComponentName << "START = DIAG_START_" << ComponentName
  35        << ",\n";
  36     OS << "#undef " << ComponentName << "START\n";
  37     OS << "#endif\n";
  38   }
  39
  40   const std::vector<Record*> &Diags =
  41     Records.getAllDerivedDefinitions("Diagnostic");
  42
  43   for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
  44     const Record &R = *Diags[i];
  45     // Filter by component.
  46     if (!Component.empty() && Component != R.getValueAsString("Component"))
  47       continue;
  48
  49     OS << "DIAG(" << R.getName() << ", ";
  50     OS << R.getValueAsDef("Class")->getName();
  51     OS << ", diag::" << R.getValueAsDef("DefaultMapping")->getName();
  52
  53     // Description string.
  54     OS << ", \"";
  55     std::string S = R.getValueAsString("Text");
  56     EscapeString(S);
  57     OS << S << "\"";
  58
  59     // Warning associated with the diagnostic.
  60     if (DefInit *DI = dynamic_cast<DefInit*>(R.getValueInit("Group"))) {
  61       S = DI->getDef()->getValueAsString("GroupName");
  62       EscapeString(S);
  63       OS << ", \"" << S << "\"";
  64     } else {
  65       OS << ", 0";
  66     }
  67
  68     // SFINAE bit
  69     if (R.getValueAsBit("SFINAE"))
  70       OS << ", true";
  71     else
  72       OS << ", false";
  73     OS << ")\n";
  74   }
  75 }
  76
  77 //===----------------------------------------------------------------------===//
  78 // Warning Group Tables generation
  79 //===----------------------------------------------------------------------===//
  80
  81 struct GroupInfo {
  82   std::vector<const Record*> DiagsInGroup;
  83   std::vector<std::string> SubGroups;
  84   unsigned IDNo;
  85 };
  86
  87 void ClangDiagGroupsEmitter::run(raw_ostream &OS) {
  88   // Invert the 1-[0/1] mapping of diags to group into a one to many mapping of
  89   // groups to diags in the group.
  90   std::map<std::string, GroupInfo> DiagsInGroup;
  91
  92   std::vector<Record*> Diags =
  93     Records.getAllDerivedDefinitions("Diagnostic");
  94   for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
  95     const Record *R = Diags[i];
  96     DefInit *DI = dynamic_cast<DefInit*>(R->getValueInit("Group"));
  97     if (DI == 0) continue;
  98     std::string GroupName = DI->getDef()->getValueAsString("GroupName");
  99     DiagsInGroup[GroupName].DiagsInGroup.push_back(R);
 100   }
 101
 102   // Add all DiagGroup's to the DiagsInGroup list to make sure we pick up empty
 103   // groups (these are warnings that GCC supports that clang never produces).
 104   Diags = Records.getAllDerivedDefinitions("DiagGroup");
 105   for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
 106     Record *Group = Diags[i];
 107     GroupInfo &GI = DiagsInGroup[Group->getValueAsString("GroupName")];
 108
 109     std::vector<Record*> SubGroups = Group->getValueAsListOfDefs("SubGroups");
 110     for (unsigned j = 0, e = SubGroups.size(); j != e; ++j)
 111       GI.SubGroups.push_back(SubGroups[j]->getValueAsString("GroupName"));
 112   }
 113
 114   // Assign unique ID numbers to the groups.
 115   unsigned IDNo = 0;
 116   for (std::map<std::string, GroupInfo>::iterator
 117        I = DiagsInGroup.begin(), E = DiagsInGroup.end(); I != E; ++I, ++IDNo)
 118     I->second.IDNo = IDNo;
 119
 120   // Walk through the groups emitting an array for each diagnostic of the diags
 121   // that are mapped to.
 122   OS << "\n#ifdef GET_DIAG_ARRAYS\n";
 123   unsigned MaxLen = 0;
 124   for (std::map<std::string, GroupInfo>::iterator
 125        I = DiagsInGroup.begin(), E = DiagsInGroup.end(); I != E; ++I) {
 126     MaxLen = std::max(MaxLen, (unsigned)I->first.size());
 127
 128     std::vector<const Record*> &V = I->second.DiagsInGroup;
 129     if (!V.empty()) {
 130       OS << "static const short DiagArray" << I->second.IDNo << "[] = { ";
 131       for (unsigned i = 0, e = V.size(); i != e; ++i)
 132         OS << "diag::" << V[i]->getName() << ", ";
 133       OS << "-1 };\n";
 134     }
 135
 136     const std::vector<std::string> &SubGroups = I->second.SubGroups;
 137     if (!SubGroups.empty()) {
 138       OS << "static const char DiagSubGroup" << I->second.IDNo << "[] = { ";
 139       for (unsigned i = 0, e = SubGroups.size(); i != e; ++i) {
 140         std::map<std::string, GroupInfo>::iterator RI =
 141           DiagsInGroup.find(SubGroups[i]);
 142         assert(RI != DiagsInGroup.end() && "Referenced without existing?");
 143         OS << RI->second.IDNo << ", ";
 144       }
 145       OS << "-1 };\n";
 146     }
 147   }
 148   OS << "#endif // GET_DIAG_ARRAYS\n\n";
 149
 150   // Emit the table now.
 151   OS << "\n#ifdef GET_DIAG_TABLE\n";
 152   for (std::map<std::string, GroupInfo>::iterator
 153        I = DiagsInGroup.begin(), E = DiagsInGroup.end(); I != E; ++I) {
 154     std::string S = I->first;
 155     EscapeString(S);
 156     // Group option string.
 157     OS << "  { \"" << S << "\","
 158       << std::string(MaxLen-I->first.size()+1, ' ');
 159
 160     // Diagnostics in the group.
 161     if (I->second.DiagsInGroup.empty())
 162       OS << "0, ";
 163     else
 164       OS << "DiagArray" << I->second.IDNo << ", ";
 165
 166     // Subgroups.
 167     if (I->second.SubGroups.empty())
 168       OS << 0;
 169     else
 170       OS << "DiagSubGroup" << I->second.IDNo;
 171     OS << " },\n";
 172   }
 173   OS << "#endif // GET_DIAG_TABLE\n\n";
 174 }