[analyzer] Fix an assertion failure if plugins added dependencies

Ideally, there is no reason behind not being able to depend on checkers that
come from a different plugin (or on builtin checkers) -- however, this is only
possible if all checkers are added to the registry before resolving checker
dependencies. Since I used a binary search in my addDependency method, this also
resulted in an assertion failure (due to CheckerRegistry::Checkers not being
sorted), since the function used by plugins to register their checkers
(clang_registerCheckers) calls addDependency.

This patch resolves this issue by only noting which dependencies have to
established when addDependency is called, and resolves them at a later stage
when no more checkers are added to the registry, by which point
CheckerRegistry::Checkers is already sorted.

Differential Revision: https://reviews.llvm.org/D59461

llvm-svn: 358750

clang/include/clang/StaticAnalyzer/Frontend/CheckerRegistry.h

@@ -195,6 +195,12 @@ private:
   CheckerInfoList Checkers;
   llvm::StringMap<size_t> PackageSizes;
 
+  /// Contains all (Dependendent checker, Dependency) pairs. We need this, as
+  /// we'll resolve dependencies after all checkers were added first.
+  llvm::SmallVector<std::pair<StringRef, StringRef>, 0> Dependencies;
+
+  void resolveDependencies();
+
   DiagnosticsEngine &Diags;
   AnalyzerOptions &AnOpts;
   const LangOptions &LangOpts;

clang/lib/StaticAnalyzer/Frontend/CheckerRegistry.cpp

@@ -177,6 +177,8 @@ CheckerRegistry::CheckerRegistry(
 #undef CHECKER_DEPENDENCY
 #undef GET_CHECKER_DEPENDENCIES
 
+  resolveDependencies();
+
   // Parse '-analyzer-checker' and '-analyzer-disable-checker' options from the
   // command line.
   for (const std::pair<std::string, bool> &Opt : AnOpts.CheckersControlList) {
@@ -278,18 +280,26 @@ void CheckerRegistry::addChecker(InitializationFunction Rfn,
   }
 }
 
+void CheckerRegistry::resolveDependencies() {
+  for (const std::pair<StringRef, StringRef> &Entry : Dependencies) {
+    auto CheckerIt = binaryFind(Checkers, Entry.first);
+    assert(CheckerIt != Checkers.end() && CheckerIt->FullName == Entry.first &&
+           "Failed to find the checker while attempting to set up its "
+           "dependencies!");
+
+    auto DependencyIt = binaryFind(Checkers, Entry.second);
+    assert(DependencyIt != Checkers.end() &&
+           DependencyIt->FullName == Entry.second &&
+           "Failed to find the dependency of a checker!");
+
+    CheckerIt->Dependencies.emplace_back(&*DependencyIt);
+  }
+
+  Dependencies.clear();
+}
+
 void CheckerRegistry::addDependency(StringRef FullName, StringRef Dependency) {
-  auto CheckerIt = binaryFind(Checkers, FullName);
-  assert(CheckerIt != Checkers.end() && CheckerIt->FullName == FullName &&
-         "Failed to find the checker while attempting to set up its "
-         "dependencies!");
-
-  auto DependencyIt = binaryFind(Checkers, Dependency);
-  assert(DependencyIt != Checkers.end() &&
-         DependencyIt->FullName == Dependency &&
-         "Failed to find the dependency of a checker!");
-
-  CheckerIt->Dependencies.emplace_back(&*DependencyIt);
+  Dependencies.emplace_back(FullName, Dependency);
 }
 
 void CheckerRegistry::initializeManager(CheckerManager &CheckerMgr) const {

clang/test/Analysis/checker-dependencies.c

@@ -1,3 +1,20 @@
 // RUN: %clang_analyze_cc1 %s \
 // RUN:   -analyzer-checker=core \
 // RUN:   -analyzer-checker=nullability.NullReturnedFromNonnull
+
+// RUN: %clang_analyze_cc1 %s \
+// RUN:   -analyzer-checker=osx.cocoa.RetainCount \
+// RUN:   -analyzer-list-enabled-checkers \
+// RUN:   2>&1 | FileCheck %s -check-prefix=CHECK-IMPLICITLY-ENABLED
+
+// CHECK-IMPLICITLY-ENABLED: osx.cocoa.RetainCountBase
+// CHECK-IMPLICITLY-ENABLED: osx.cocoa.RetainCount
+
+// RUN: %clang_analyze_cc1 %s \
+// RUN:   -analyzer-checker=osx.cocoa.RetainCount \
+// RUN:   -analyzer-disable-checker=osx.cocoa.RetainCountBase \
+// RUN:   -analyzer-list-enabled-checkers \
+// RUN:   2>&1 | FileCheck %s -check-prefix=CHECK-IMPLICITLY-DISABLED
+
+// CHECK-IMPLICITLY-DISABLED-NOT: osx.cocoa.RetainCountBase
+// CHECK-IMPLICITLY-DISABLED-NOT: osx.cocoa.RetainCount