Revert various template unreachability code I committed accidentally.

r148774, r148775, r148776, r148777

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148780 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/CFG.cpp

@@ -721,7 +721,7 @@ void CFGBuilder::addAutomaticObjDtors(LocalScope::const_iterator B,
     }
     
     const CXXDestructorDecl *Dtor = Ty->getAsCXXRecordDecl()->getDestructor();
-    if (Dtor && cast<FunctionType>(Dtor->getType())->getNoReturnAttr())
+    if (cast<FunctionType>(Dtor->getType())->getNoReturnAttr())
       Block = createNoReturnBlock();
     else
       autoCreateBlock();
@@ -750,12 +750,13 @@ void CFGBuilder::addImplicitDtorsForDestructor(const CXXDestructorDecl *DD) {
   // Before virtual bases destroy direct base objects.
   for (CXXRecordDecl::base_class_const_iterator BI = RD->bases_begin(),
       BE = RD->bases_end(); BI != BE; ++BI) {
-    if (!BI->isVirtual())
-      if (const CXXRecordDecl *CD = BI->getType()->getAsCXXRecordDecl())
-        if (!CD->hasTrivialDestructor()) {
-          autoCreateBlock();
-          appendBaseDtor(Block, BI);
-        }
+    if (!BI->isVirtual()) {
+      const CXXRecordDecl *CD = BI->getType()->getAsCXXRecordDecl();
+      if (!CD->hasTrivialDestructor()) {
+        autoCreateBlock();
+        appendBaseDtor(Block, BI);
+      }
+    }
   }
 
   // First destroy member objects.
@@ -864,7 +865,7 @@ LocalScope* CFGBuilder::addLocalScopeForVarDecl(VarDecl *VD,
 
   // Check if type is a C++ class with non-trivial destructor.
   if (const CXXRecordDecl *CD = QT->getAsCXXRecordDecl())
-    if (CD->hasDefinition() && !CD->hasTrivialDestructor()) {
+    if (!CD->hasTrivialDestructor()) {
       // Add the variable to scope
       Scope = createOrReuseLocalScope(Scope);
       Scope->addVar(VD);

lib/Sema/AnalysisBasedWarnings.cpp

@@ -782,7 +782,8 @@ AnalysisBasedWarnings::IssueWarnings(sema::AnalysisBasedWarnings::Policy P,
     return;
 
   // For code in dependent contexts, we'll do this at instantiation time.
-  bool Dependent = cast<DeclContext>(D)->isDependentContext();
+  if (cast<DeclContext>(D)->isDependentContext())
+    return;
 
   if (Diags.hasErrorOccurred() || Diags.hasFatalErrorOccurred()) {
     // Flush out any possibly unreachable diagnostics.
@@ -825,7 +826,7 @@ AnalysisBasedWarnings::IssueWarnings(sema::AnalysisBasedWarnings::Policy P,
   // Construct the analysis context with the specified CFG build options.
   
   // Emit delayed diagnostics.
-  if (!fscope->PossiblyUnreachableDiags.empty() && !Dependent) {
+  if (!fscope->PossiblyUnreachableDiags.empty()) {
     bool analyzed = false;
 
     // Register the expressions with the CFGBuilder.
@@ -873,7 +874,7 @@ AnalysisBasedWarnings::IssueWarnings(sema::AnalysisBasedWarnings::Policy P,
   
   
   // Warning: check missing 'return'
-  if (P.enableCheckFallThrough && !Dependent) {
+  if (P.enableCheckFallThrough) {
     const CheckFallThroughDiagnostics &CD =
       (isa<BlockDecl>(D) ? CheckFallThroughDiagnostics::MakeForBlock()
                          : CheckFallThroughDiagnostics::MakeForFunction(D));
@@ -894,7 +895,7 @@ AnalysisBasedWarnings::IssueWarnings(sema::AnalysisBasedWarnings::Policy P,
   }
 
   // Check for thread safety violations
-  if (P.enableThreadSafetyAnalysis && !Dependent) {
+  if (P.enableThreadSafetyAnalysis) {
     SourceLocation FL = AC.getDecl()->getLocation();
     thread_safety::ThreadSafetyReporter Reporter(S, FL);
     thread_safety::runThreadSafetyAnalysis(AC, Reporter);

test/SemaCXX/array-bounds.cpp

@@ -73,21 +73,17 @@ void test() {
   (*array_ptr)[3] = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
 }
 
-// FIXME: we should see the next note only 3 times and the following warning once, not twice
-//        since it is independent of the template parameter 'I'.
 template <int I> struct S {
-  char arr[I]; // expected-note 4 {{declared here}}
+  char arr[I]; // expected-note 2 {{declared here}}
 };
 template <int I> void f() {
   S<3> s;
-  s.arr[4] = 0; // expected-warning 2 {{array index 4 is past the end of the array (which contains 3 elements)}}
-  s.arr[I] = 0; // expected-warning {{array index 5 is past the end of the array (which contains 3 elements)}} \
-                   expected-warning {{array index 3 is past the end of the array (which contains 3 elements)}}
+  s.arr[4] = 0; // expected-warning {{array index 4 is past the end of the array (which contains 3 elements)}}
+  s.arr[I] = 0; // expected-warning {{array index 5 is past the end of the array (which contains 3 elements)}}
 }
 
 void test_templates() {
   f<5>(); // expected-note {{in instantiation}}
-  f<3>(); // expected-note {{in instantiation}}
 }
 
 #define SIZE 10

test/SemaCXX/warn-unreachable.cpp

@@ -98,24 +98,6 @@ void test_unreachable_templates_harness() {
   test_unreachable_templates<TestUnreachableB>(); 
 }
 
-// Do warn about non-dependent unreachable code in templates
-// Warn even if the template is never instantiated
-
-template<typename T> void test_non_dependent_unreachable_templates() {
-  TestUnreachableA::foo();
-  isUnreachable(); // expected-warning {{will never be executed}}
-}
-
-// Warn only once even if the template is instantiated multiple times
-
-template<typename T> void test_non_dependent_unreachable_templates2() {
-  TestUnreachableA::foo();
-  isUnreachable(); // expected-warning {{will never be executed}}
-}
-
-template void test_non_dependent_unreachable_templates2<int>();
-template void test_non_dependent_unreachable_templates2<long>();
-
 // Do warn about explict template specializations, as they represent
 // actual concrete functions that somebody wrote.
 
@@ -125,19 +107,3 @@ template <> void funcToSpecialize<int>() {
   dead(); // expected-warning {{will never be executed}}
 }
 
-// Ensure we don't regress a fix involving undefined bases to template
-// destructors when computing the CFG for unreachable code analysis
-template<int> struct imp;
-template<int a>
-struct aligned_storage : imp<a> {
- ~aligned_storage() { }
-};
-
-// is this valid?
-template<typename T>
-class outer {
-  class inner;
-  void func() {
-    inner t;
-  }
-};