[clang][Interp] Handle CXXNoexceptExprs

Differential Revision: https://reviews.llvm.org/D155707
llvm · Jul 26, 2023 · 378fcbf · 378fcbf
1 parent 744a968
commit 378fcbf
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diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.cpp b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -1006,6 +1006,15 @@ bool ByteCodeExprGen<Emitter>::VisitCXXReinterpretCastExpr(
   return this->emitInvalidCast(CastKind::Reinterpret, E);
 }
 
+template <class Emitter>
+bool ByteCodeExprGen<Emitter>::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
+  assert(E->getType()->isBooleanType());
+
+  if (DiscardResult)
+    return true;
+  return this->emitConstBool(E->getValue(), E);
+}
+
 template <class Emitter> bool ByteCodeExprGen<Emitter>::discard(const Expr *E) {
   if (E->containsErrors())
     return false;

diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.h b/clang/lib/AST/Interp/ByteCodeExprGen.h
@@ -99,6 +99,7 @@ class ByteCodeExprGen : public ConstStmtVisitor<ByteCodeExprGen<Emitter>, bool>,
   bool VisitPredefinedExpr(const PredefinedExpr *E);
   bool VisitCXXThrowExpr(const CXXThrowExpr *E);
   bool VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E);
+  bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E);
 
 protected:
   bool visitExpr(const Expr *E) override;

diff --git a/clang/test/AST/Interp/literals.cpp b/clang/test/AST/Interp/literals.cpp
@@ -910,3 +910,25 @@ namespace PredefinedExprs {
   static_assert(heh(2) == 'h', "");
 #endif
 }
+
+namespace NE {
+  constexpr int foo() noexcept {
+    return 1;
+  }
+  static_assert(noexcept(foo()), "");
+  constexpr int foo2() {
+    return 1;
+  }
+  static_assert(!noexcept(foo2()), "");
+
+#if __cplusplus > 201402L
+  constexpr int a() {
+    int b = 0;
+    (void)noexcept(++b); // expected-warning {{expression with side effects has no effect in an unevaluated context}} \
+                         // ref-warning {{expression with side effects has no effect in an unevaluated context}}
+
+    return b;
+  }
+  static_assert(a() == 0, "");
+#endif
+}
diff --git a/clang/test/SemaCXX/cxx0x-noexcept-expression.cpp b/clang/test/SemaCXX/cxx0x-noexcept-expression.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++2a %s -fexceptions -fcxx-exceptions -Wno-unevaluated-expression
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++2a %s -fexceptions -fcxx-exceptions -Wno-unevaluated-expression -fexperimental-new-constant-interpreter
 
 void f(); // expected-note {{possible target for call}}
 void f(int); // expected-note {{possible target for call}}