Index implicit function calls.

src/indexer.cc

@@ -145,6 +145,42 @@ bool IsLocalSemanticContainer(CXCursorKind kind) {
   }
 }
 
+// Returns true if the given entity kind can be called implicitly, ie, without
+// actually being written in the source code.
+bool CanBeCalledImplicitly(CXIdxEntityKind kind) {
+  switch (kind) {
+  case CXIdxEntity_CXXConstructor:
+  case CXIdxEntity_CXXConversionFunction:
+  case CXIdxEntity_CXXDestructor:
+    return true;
+  default:
+    return false;
+  }
+}
+
+// Returns true if the cursor spelling contains the given string. This is
+// useful to check for implicit function calls.
+bool CursorSpellingContainsString(CXCursor cursor, CXTranslationUnit cx_tu, std::string scanning_for) {
+  CXSourceRange range = clang_Cursor_getSpellingNameRange(cursor, 0, 0);
+  CXToken* tokens;
+  unsigned int num_tokens;
+  clang_tokenize(cx_tu, range, &tokens, &num_tokens);
+
+  bool result = false;
+
+  for (size_t i = 0; i < num_tokens; ++i) {
+    CXString name = clang_getTokenSpelling(cx_tu, tokens[i]);
+    if (strcmp(clang_getCString(name), scanning_for.c_str()) == 0) {
+      result = true;
+      break;
+    }
+    clang_disposeString(name);
+  }
+
+  clang_disposeTokens(cx_tu, tokens, num_tokens);
+  return result;
+}
+
 }  // namespace
 
 
@@ -1373,18 +1409,25 @@ void indexEntityReference(CXClientData client_data,
       // TODO: search full history?
       Range loc_spelling = ResolveSpelling(ref->cursor);
 
-      // Note: be careful, calling db->ToFuncId invalidates the FuncDef* ptrs.
       IndexFuncId called_id = db->ToFuncId(ref->referencedEntity->USR);
+      IndexFunc* called_def = db->Resolve(called_id);
+
+      // libclang doesn't provide a nice api to check if the given function
+      // call is implicit. ref->kind should probably work (it's either direct
+      // or implicit), but libclang only supports implicit for objective-c.
+      bool is_implicit = CanBeCalledImplicitly(ref->referencedEntity->kind) &&
+                         !CursorSpellingContainsString(ref->cursor, param->tu->cx_tu, called_def->def.short_name);
+
       if (IsFunctionCallContext(ref->container->cursor.kind)) {
         IndexFuncId caller_id = db->ToFuncId(ref->container->cursor);
         IndexFunc* caller_def = db->Resolve(caller_id);
-        IndexFunc* called_def = db->Resolve(called_id);
+        // Calling db->ToFuncId invalidates the FuncDef* ptrs.
+        called_def = db->Resolve(called_id);
 
-        AddFuncRef(&caller_def->def.callees, IndexFuncRef(called_id, loc_spelling));
-        AddFuncRef(&called_def->callers, IndexFuncRef(caller_id, loc_spelling));
+        AddFuncRef(&caller_def->def.callees, IndexFuncRef(called_id, loc_spelling, is_implicit));
+        AddFuncRef(&called_def->callers, IndexFuncRef(caller_id, loc_spelling, is_implicit));
       } else {
-        IndexFunc* called_def = db->Resolve(called_id);
-        AddFuncRef(&called_def->callers, IndexFuncRef(loc_spelling));
+        AddFuncRef(&called_def->callers, IndexFuncRef(loc_spelling, is_implicit));
       }
 
       break;

src/indexer.h

@@ -75,66 +75,62 @@ using IndexVarId = Id<IndexVar>;
 
 struct IdCache;
 
-template <typename T>
-struct Ref {
-  Id<T> id() const {
-    assert(has_id());
-    return id_;
-  }
-  bool has_id() const {
-    return id_.id != -1;
-  }
 
-  Id<T> id_;
+struct IndexFuncRef {
+  IndexFuncId id;
   Range loc;
+  bool is_implicit = false;
 
-  Ref() {}  // For serialization.
+  IndexFuncRef() {}  // For serialization.
 
-  Ref(Id<T> id, Range loc) : id_(id), loc(loc) {}
-  Ref(Range loc) : id_(Id<T>((size_t)-1)), loc(loc) {}
+  IndexFuncRef(IndexFuncId id, Range loc, bool is_implicit) : id(id), loc(loc), is_implicit(is_implicit) {}
+  IndexFuncRef(Range loc, bool is_implicit) : id(IndexFuncId((size_t)-1)), loc(loc), is_implicit(is_implicit) {}
 
-  bool operator==(const Ref<T>& other) {
-    return id_ == other.id_ && loc == other.loc;
+  inline bool operator==(const IndexFuncRef& other) {
+    return id == other.id && loc == other.loc;
   }
-  bool operator!=(const Ref<T>& other) { return !(*this == other); }
-  bool operator<(const Ref<T>& other) const {
-    if (id_ < other.id)
+  inline bool operator!=(const IndexFuncRef& other) { return !(*this == other); }
+  inline bool operator<(const IndexFuncRef& other) const {
+    if (id < other.id)
       return true;
-    return id_ == other.id && loc < other.loc;
+    return id == other.id && loc < other.loc;
   }
 };
 
-template <typename T>
-bool operator==(const Ref<T>& a, const Ref<T>& b) {
-  return a.id_ == b.id_ && a.loc == b.loc;
+inline bool operator==(const IndexFuncRef& a, const IndexFuncRef& b) {
+  return a.id == b.id && a.loc == b.loc;
 }
-template <typename T>
-bool operator!=(const Ref<T>& a, const Ref<T>& b) {
+inline bool operator!=(const IndexFuncRef& a, const IndexFuncRef& b) {
   return !(a == b);
 }
 
-template<typename T>
-void Reflect(Reader& visitor, Ref<T>& value) {
+inline void Reflect(Reader& visitor, IndexFuncRef& value) {
   const char* str_value = visitor.GetString();
+  if (str_value[0] == '~') {
+    value.is_implicit = true;
+    ++str_value;
+  }
   uint64_t id = atol(str_value);
   const char* loc_string = strchr(str_value, '@') + 1;
 
-  value.id_ = Id<T>(id);
+  value.id = IndexFuncId(id);
   value.loc = Range(loc_string);
 }
-template<typename T>
-void Reflect(Writer& visitor, Ref<T>& value) {
-  if (value.id_.id == -1) {
-    std::string s = "-1@" + value.loc.ToString();
-    visitor.String(s.c_str());
+inline void Reflect(Writer& visitor, IndexFuncRef& value) {
+  std::string s;
+
+  if (value.is_implicit)
+    s += "~";
+  if (value.id.id == -1) { // id.id is unsigned, special case 0 value
+    s += "-1";
   }
   else {
-    std::string s = std::to_string(value.id_.id) + "@" + value.loc.ToString();
-    visitor.String(s.c_str());
-  }
+    s += std::to_string(value.id.id);
   }
 
-using IndexFuncRef = Ref<IndexFunc>;
+  s += "@" + value.loc.ToString();
+  visitor.String(s.c_str());
+}
 
 // TODO: skip as much forward-processing as possible when |is_system_def| is
 //       set to false.

src/query.cc

@@ -339,7 +339,7 @@ QueryVarId IdMap::ToQuery(IndexVarId id) const {
   return QueryVarId(cached_var_ids_.find(id)->second);
 }
 QueryFuncRef IdMap::ToQuery(IndexFuncRef ref) const {
-  return QueryFuncRef(ToQuery(ref.id_), ToQuery(ref.loc));
+  return QueryFuncRef(ToQuery(ref.id), ToQuery(ref.loc));
 }
 
 optional<QueryLocation> IdMap::ToQuery(optional<Range> range) const {
@@ -815,8 +815,8 @@ TEST_CASE("func callers") {
   IndexFunc* pf = previous.Resolve(previous.ToFuncId("usr"));
   IndexFunc* cf = current.Resolve(current.ToFuncId("usr"));
 
-  pf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(1, 0))));
-  cf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(2, 0))));
+  pf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(1, 0)), false /*is_implicit*/));
+  cf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(2, 0)), false /*is_implicit*/));
 
   IndexUpdate update = GetDelta(previous, current);
 
@@ -856,10 +856,10 @@ TEST_CASE("apply delta") {
 
   IndexFunc* pf = previous.Resolve(previous.ToFuncId("usr"));
   IndexFunc* cf = current.Resolve(current.ToFuncId("usr"));
-  pf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(1, 0))));
-  pf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(2, 0))));
-  cf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(4, 0))));
-  cf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(5, 0))));
+  pf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(1, 0)), false /*is_implicit*/));
+  pf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(2, 0)), false /*is_implicit*/));
+  cf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(4, 0)), false /*is_implicit*/));
+  cf->callers.push_back(IndexFuncRef(IndexFuncId(0), Range(Position(5, 0)), false /*is_implicit*/));
 
   QueryDatabase db;
   IdMap previous_map(&db, previous.id_cache);

tests/constructors/constructor.cc

@@ -30,7 +30,7 @@ OUTPUT:
       "definition_spelling": "3:3-3:6",
       "definition_extent": "3:3-3:11",
       "declaring_type": 0,
-      "callers": ["1@7:7-7:8", "1@8:17-8:20"]
+      "callers": ["~1@7:7-7:8", "1@8:17-8:20"]
     }, {
       "id": 1,
       "usr": "c:@F@foo#",
@@ -38,7 +38,7 @@ OUTPUT:
       "detailed_name": "void foo()",
       "definition_spelling": "6:6-6:9",
       "definition_extent": "6:1-9:2",
-      "callees": ["0@7:7-7:8", "0@8:17-8:20"]
+      "callees": ["~0@7:7-7:8", "0@8:17-8:20"]
     }],
   "vars": [{
       "id": 0,

tests/constructors/destructor.cc

@@ -35,7 +35,7 @@ OUTPUT:
       "definition_spelling": "3:3-3:6",
       "definition_extent": "3:3-3:11",
       "declaring_type": 0,
-      "callers": ["2@8:7-8:8"]
+      "callers": ["~2@8:7-8:8"]
     }, {
       "id": 1,
       "usr": "c:@S@Foo@F@~Foo#",
@@ -51,7 +51,7 @@ OUTPUT:
       "detailed_name": "void foo()",
       "definition_spelling": "7:6-7:9",
       "definition_extent": "7:1-9:2",
-      "callees": ["0@8:7-8:8"]
+      "callees": ["~0@8:7-8:8"]
     }],
   "vars": [{
       "id": 0,

tests/constructors/implicit_constructor.cc

@@ -0,0 +1,63 @@
+struct Type {
+  Type() {}
+};
+
+void Make() {
+  Type foo;
+  auto foo = Type();
+}
+
+/*
+OUTPUT:
+{
+  "types": [{
+      "id": 0,
+      "usr": "c:@S@Type",
+      "short_name": "Type",
+      "detailed_name": "Type",
+      "definition_spelling": "1:8-1:12",
+      "definition_extent": "1:1-3:2",
+      "funcs": [0],
+      "instances": [0],
+      "uses": ["1:8-1:12", "2:3-2:7", "6:3-6:7"]
+    }],
+  "funcs": [{
+      "id": 0,
+      "usr": "c:@S@Type@F@Type#",
+      "short_name": "Type",
+      "detailed_name": "void Type::Type()",
+      "definition_spelling": "2:3-2:7",
+      "definition_extent": "2:3-2:12",
+      "declaring_type": 0,
+      "callers": ["~1@6:8-6:11"]
+    }, {
+      "id": 1,
+      "usr": "c:@F@Make#",
+      "short_name": "Make",
+      "detailed_name": "void Make()",
+      "definition_spelling": "5:6-5:10",
+      "definition_extent": "5:1-8:2",
+      "callees": ["~0@6:8-6:11"]
+    }],
+  "vars": [{
+      "id": 0,
+      "usr": "c:implicit_constructor.cc@51@F@Make#@foo",
+      "short_name": "foo",
+      "detailed_name": "Type foo",
+      "definition_spelling": "6:8-6:11",
+      "definition_extent": "6:3-6:11",
+      "variable_type": 0,
+      "is_local": true,
+      "uses": ["6:8-6:11"]
+    }, {
+      "id": 1,
+      "usr": "c:implicit_constructor.cc@64@F@Make#@foo",
+      "short_name": "foo",
+      "detailed_name": "auto foo",
+      "definition_spelling": "7:8-7:11",
+      "definition_extent": "7:3-7:11",
+      "is_local": true,
+      "uses": ["7:8-7:11"]
+    }]
+}
+*/

tests/usage/func_called_implicit_ctor.cc

@@ -28,7 +28,7 @@ OUTPUT:
       "detailed_name": "void Wrapper::Wrapper(int)",
       "declarations": ["2:3-2:10"],
       "declaring_type": 0,
-      "callers": ["2@8:10-8:16"]
+      "callers": ["~2@8:10-8:16"]
     }, {
       "id": 1,
       "usr": "c:@F@called#",
@@ -44,7 +44,7 @@ OUTPUT:
       "detailed_name": "Wrapper caller()",
       "definition_spelling": "7:9-7:15",
       "definition_extent": "7:1-9:2",
-      "callees": ["0@8:10-8:16", "1@8:10-8:16"]
+      "callees": ["~0@8:10-8:16", "1@8:10-8:16"]
     }]
 }
 */