add the ability to associate 'category' names with clang diagnostics

and diagnostic groups.  This allows the compiler to group 
diagnostics together (e.g. "Logic Warning", 
"Format String Warning", etc) like the static analyzer does.  
This is not exposed through anything in the compiler yet.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103050 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/ClangDiagnosticsEmitter.cpp

@@ -17,11 +17,108 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/VectorExtras.h"
 #include <set>
 #include <map>
 using namespace llvm;
 
+//===----------------------------------------------------------------------===//
+// Diagnostic category computation code.
+//===----------------------------------------------------------------------===//
+
+namespace {
+class DiagGroupParentMap {
+  std::map<const Record*, std::vector<Record*> > Mapping;
+public:
+  DiagGroupParentMap() {
+    std::vector<Record*> DiagGroups
+      = Records.getAllDerivedDefinitions("DiagGroup");
+    for (unsigned i = 0, e = DiagGroups.size(); i != e; ++i) {
+      std::vector<Record*> SubGroups =
+        DiagGroups[i]->getValueAsListOfDefs("SubGroups");
+      for (unsigned j = 0, e = SubGroups.size(); j != e; ++j)
+        Mapping[SubGroups[j]].push_back(DiagGroups[i]);
+    }
+  }
+  
+  const std::vector<Record*> &getParents(const Record *Group) {
+    return Mapping[Group];
+  }
+};
+} // end anonymous namespace.
+
+
+static std::string
+getCategoryFromDiagGroup(const Record *Group,
+                         DiagGroupParentMap &DiagGroupParents) {
+  // If the DiagGroup has a category, return it.
+  std::string CatName = Group->getValueAsString("CategoryName");
+  if (!CatName.empty()) return CatName;
+  
+  // The diag group may the subgroup of one or more other diagnostic groups,
+  // check these for a category as well.
+  const std::vector<Record*> &Parents = DiagGroupParents.getParents(Group);
+  for (unsigned i = 0, e = Parents.size(); i != e; ++i) {
+    CatName = getCategoryFromDiagGroup(Parents[i], DiagGroupParents);
+    if (!CatName.empty()) return CatName;
+  }
+  return "";
+}
+
+/// getDiagnosticCategory - Return the category that the specified diagnostic
+/// lives in.
+static std::string getDiagnosticCategory(const Record *R,
+                                         DiagGroupParentMap &DiagGroupParents) {
+  // If the diagnostic itself has a category, get it.
+  std::string CatName = R->getValueAsString("CategoryName");
+  if (!CatName.empty()) return CatName;
+  
+  DefInit *Group = dynamic_cast<DefInit*>(R->getValueInit("Group"));
+  if (Group == 0) return "";
+  
+  // Check the diagnostic's diag group for a category.
+  return getCategoryFromDiagGroup(Group->getDef(), DiagGroupParents);
+}
+
+namespace {
+  class DiagCategoryIDMap {
+    StringMap<unsigned> CategoryIDs;
+    std::vector<std::string> CategoryStrings;
+  public:
+    DiagCategoryIDMap() {
+      DiagGroupParentMap ParentInfo;
+      
+      // The zero'th category is "".
+      CategoryStrings.push_back("");
+      CategoryIDs[""] = 0;
+      
+      std::vector<Record*> Diags =
+      Records.getAllDerivedDefinitions("Diagnostic");
+      for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
+        std::string Category = getDiagnosticCategory(Diags[i], ParentInfo);
+        if (Category.empty()) continue;  // Skip diags with no category.
+        
+        unsigned &ID = CategoryIDs[Category];
+        if (ID != 0) continue;  // Already seen.
+        
+        ID = CategoryStrings.size();
+        CategoryStrings.push_back(Category);
+      }
+    }
+    
+    unsigned getID(StringRef CategoryString) {
+      return CategoryIDs[CategoryString];
+    }
+    
+    typedef std::vector<std::string>::iterator iterator;
+    iterator begin() { return CategoryStrings.begin(); }
+    iterator end() { return CategoryStrings.end(); }
+  };
+} // end anonymous namespace.
+
+
+
 //===----------------------------------------------------------------------===//
 // Warning Tables (.inc file) generation.
 //===----------------------------------------------------------------------===//
@@ -40,6 +137,9 @@ void ClangDiagsDefsEmitter::run(raw_ostream &OS) {
   const std::vector<Record*> &Diags =
     Records.getAllDerivedDefinitions("Diagnostic");
   
+  DiagCategoryIDMap CategoryIDs;
+  DiagGroupParentMap DGParentMap;
+
   for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
     const Record &R = *Diags[i];
     // Filter by component.
@@ -67,6 +167,9 @@ void ClangDiagsDefsEmitter::run(raw_ostream &OS) {
       OS << ", true";
     else
       OS << ", false";
+    
+    // Category number.
+    OS << ", " << CategoryIDs.getID(getDiagnosticCategory(&R, DGParentMap));
     OS << ")\n";
   }
 }
@@ -82,6 +185,9 @@ struct GroupInfo {
 };
 
 void ClangDiagGroupsEmitter::run(raw_ostream &OS) {
+  // Compute a mapping from a DiagGroup to all of its parents.
+  DiagGroupParentMap DGParentMap;
+  
   // Invert the 1-[0/1] mapping of diags to group into a one to many mapping of
   // groups to diags in the group.
   std::map<std::string, GroupInfo> DiagsInGroup;
@@ -98,9 +204,10 @@ void ClangDiagGroupsEmitter::run(raw_ostream &OS) {
   
   // Add all DiagGroup's to the DiagsInGroup list to make sure we pick up empty
   // groups (these are warnings that GCC supports that clang never produces).
-  Diags = Records.getAllDerivedDefinitions("DiagGroup");
-  for (unsigned i = 0, e = Diags.size(); i != e; ++i) {
-    Record *Group = Diags[i];
+  std::vector<Record*> DiagGroups
+    = Records.getAllDerivedDefinitions("DiagGroup");
+  for (unsigned i = 0, e = DiagGroups.size(); i != e; ++i) {
+    Record *Group = DiagGroups[i];
     GroupInfo &GI = DiagsInGroup[Group->getValueAsString("GroupName")];
     
     std::vector<Record*> SubGroups = Group->getValueAsListOfDefs("SubGroups");
@@ -167,4 +274,12 @@ void ClangDiagGroupsEmitter::run(raw_ostream &OS) {
     OS << " },\n";
   }
   OS << "#endif // GET_DIAG_TABLE\n\n";
+  
+  // Emit the category table next.
+  DiagCategoryIDMap CategoriesByID;
+  OS << "\n#ifdef GET_CATEGORY_TABLE\n";
+  for (DiagCategoryIDMap::iterator I = CategoriesByID.begin(),
+       E = CategoriesByID.end(); I != E; ++I)
+    OS << "CATEGORY(\"" << *I << "\")\n";
+  OS << "#endif // GET_CATEGORY_TABLE\n\n";
 }