From 3fe1e09a6e285a4792224969b582ada1bd6747f8 Mon Sep 17 00:00:00 2001
From: Nikola Smiljanic <popizdeh@gmail.com>
Date: Tue, 1 Jul 2014 04:17:53 +0000
Subject: [PATCH] PR15677 - Crash in template diffing. Check that expression is
 evaluatable before evaluating it.

llvm-svn: 212090
---
 clang/lib/AST/ASTDiagnostic.cpp           | 46 +++++++++++++++++++------------
 clang/test/Misc/diag-template-diffing.cpp | 37 +++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 17 deletions(-)

diff --git a/clang/lib/AST/ASTDiagnostic.cpp b/clang/lib/AST/ASTDiagnostic.cpp
index 6919ee2..2ee26fb 100644
--- a/clang/lib/AST/ASTDiagnostic.cpp
+++ b/clang/lib/AST/ASTDiagnostic.cpp
@@ -959,25 +959,27 @@ class TemplateDiff {
                           ToIter.isEnd() && ToExpr);
           if (DefaultNTTPD->getType()->isIntegralOrEnumerationType()) {
             if (FromExpr)
-              FromInt = GetInt(FromIter, FromExpr);
+              HasFromInt = GetInt(FromIter, FromExpr, FromInt);
             if (ToExpr)
-              ToInt = GetInt(ToIter, ToExpr);
-            Tree.SetNode(FromInt, ToInt, FromExpr, ToExpr);
+              HasToInt = GetInt(ToIter, ToExpr, ToInt);
+          }
+          if (HasFromInt && HasToInt) {
+            Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
             Tree.SetSame(IsSameConvertedInt(ParamWidth, FromInt, ToInt));
             Tree.SetKind(DiffTree::Integer);
+          } else if (HasFromInt || HasToInt) {
+            Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
+            Tree.SetSame(false);
+            Tree.SetKind(DiffTree::Integer);
           } else {
             Tree.SetSame(IsEqualExpr(Context, ParamWidth, FromExpr, ToExpr));
             Tree.SetKind(DiffTree::Expression);
           }
         } else if (HasFromInt || HasToInt) {
-          if (!HasFromInt && FromExpr) {
-            FromInt = GetInt(FromIter, FromExpr);
-            HasFromInt = true;
-          }
-          if (!HasToInt && ToExpr) {
-            ToInt = GetInt(ToIter, ToExpr);
-            HasToInt = true;
-          }
+          if (!HasFromInt && FromExpr)
+            HasFromInt = GetInt(FromIter, FromExpr, FromInt);
+          if (!HasToInt && ToExpr)
+            HasToInt = GetInt(ToIter, ToExpr, ToInt);
           Tree.SetNode(FromInt, ToInt, HasFromInt, HasToInt);
           Tree.SetSame(IsSameConvertedInt(ParamWidth, FromInt, ToInt));
           Tree.SetDefault(FromIter.isEnd() && HasFromInt,
@@ -1121,20 +1123,28 @@ class TemplateDiff {
 
   /// GetInt - Retrieves the template integer argument, including evaluating
   /// default arguments.
-  llvm::APInt GetInt(const TSTiterator &Iter, Expr *ArgExpr) {
+  bool GetInt(const TSTiterator &Iter, Expr *ArgExpr, llvm::APInt &Int) {
     // Default, value-depenedent expressions require fetching
-    // from the desugared TemplateArgument
-    if (Iter.isEnd() && ArgExpr->isValueDependent())
+    // from the desugared TemplateArgument, otherwise expression needs to
+    // be evaluatable.
+    if (Iter.isEnd() && ArgExpr->isValueDependent()) {
       switch (Iter.getDesugar().getKind()) {
         case TemplateArgument::Integral:
-          return Iter.getDesugar().getAsIntegral();
+          Int = Iter.getDesugar().getAsIntegral();
+          return true;
         case TemplateArgument::Expression:
           ArgExpr = Iter.getDesugar().getAsExpr();
-          return ArgExpr->EvaluateKnownConstInt(Context);
+          Int = ArgExpr->EvaluateKnownConstInt(Context);
+          return true;
         default:
           llvm_unreachable("Unexpected template argument kind");
       }
-    return ArgExpr->EvaluateKnownConstInt(Context);
+    } else if (ArgExpr->isEvaluatable(Context)) {
+      Int = ArgExpr->EvaluateKnownConstInt(Context);
+      return true;
+    }
+
+    return false;
   }
 
   /// GetValueDecl - Retrieves the template Decl argument, including
@@ -1517,6 +1527,8 @@ class TemplateDiff {
         Bold();
       }
       OS << Val.toString(10);
+    } else if (E) {
+      PrintExpr(E);
     } else {
       OS << "(no argument)";
     }
diff --git a/clang/test/Misc/diag-template-diffing.cpp b/clang/test/Misc/diag-template-diffing.cpp
index 4680707..c43ed26 100644
--- a/clang/test/Misc/diag-template-diffing.cpp
+++ b/clang/test/Misc/diag-template-diffing.cpp
@@ -1068,6 +1068,43 @@ void foo() {
 }
 }
 
+namespace PR15677 {
+template <bool>
+struct A{};
+
+template <typename T>
+using B = A<T::value>;
+
+template <typename T>
+using B = A<!T::value>;
+// CHECK-ELIDE-NOTREE: type alias template redefinition with different types ('A<!T::value>' vs 'A<T::value>')
+
+template <int>
+struct C{};
+
+template <typename T>
+using D = C<T::value>;
+
+template <typename T>
+using D = C<T::value + 1>;
+// CHECK-ELIDE-NOTREE: type alias template redefinition with different types ('C<T::value + 1>' vs 'C<T::value>')
+
+template <typename T>
+using E = C<T::value>;
+
+template <typename T>
+using E = C<42>;
+// CHECK-ELIDE-NOTREE: type alias template redefinition with different types ('C<42>' vs 'C<T::value>')
+
+template <typename T>
+using F = C<T::value>;
+
+template <typename T>
+using F = C<21 + 21>;
+// CHECK-ELIDE-NOTREE: type alias template redefinition with different types ('C<21 + 21 aka 42>' vs 'C<T::value>')
+}
+}
+
 // CHECK-ELIDE-NOTREE: {{[0-9]*}} errors generated.
 // CHECK-NOELIDE-NOTREE: {{[0-9]*}} errors generated.
 // CHECK-ELIDE-TREE: {{[0-9]*}} errors generated.
-- 
2.7.4