[PATCH] D56992: [clang] Mark lambda-to-function-pointer conversion as noexcept

Ignat Loskutov via Phabricator via cfe-commits Mon, 21 Jan 2019 07:39:16 -0800

loskutov updated this revision to Diff 182792.
loskutov edited the summary of this revision.
loskutov added a comment.


Reflected the change in cxx_dr_status.html and specified `-std=c++17` for the 
test.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D56992/new/

https://reviews.llvm.org/D56992

Files:
  clang/lib/Sema/SemaLambda.cpp
  clang/test/AST/ast-dump-expr.cpp
  clang/test/CXX/expr/expr.prim/expr.prim.lambda/p9.cpp
  clang/www/cxx_dr_status.html

Index: clang/www/cxx_dr_status.html
===================================================================
--- clang/www/cxx_dr_status.html
+++ clang/www/cxx_dr_status.html
@@ -10147,7 +10147,7 @@
     <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1722";>1722</a></td>
     <td>CD4</td>
     <td>Should lambda to function pointer conversion function be <TT>noexcept</TT>?</td>
-    <td class="none" align="center">Unknown</td>
+    <td class="full" align="center">Yes</td>
   </tr>
   <tr class="open" id="1723">
     <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1723";>1723</a></td>
Index: clang/test/CXX/expr/expr.prim/expr.prim.lambda/p9.cpp
===================================================================
--- /dev/null
+++ clang/test/CXX/expr/expr.prim/expr.prim.lambda/p9.cpp
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++17 %s -verify
+// expected-no-diagnostics
+
+void test_noexcept() {
+  const auto lambda = [](int x) { return x + 1; };
+  static_assert(noexcept((int (*)(int))(lambda)),
+                "Lambda-to-function-pointer conversion is expected to be noexcept");
+}
Index: clang/test/AST/ast-dump-expr.cpp
===================================================================
--- clang/test/AST/ast-dump-expr.cpp
+++ clang/test/AST/ast-dump-expr.cpp
@@ -290,7 +290,7 @@
   // CHECK-NEXT: Destructor
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:6, col:8> col:3 operator() 'auto () const' inline
   // CHECK-NEXT: CompoundStmt
-  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:8> col:3 implicit constexpr operator auto (*)() 'auto (*() const)()' inline
+  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:8> col:3 implicit constexpr operator auto (*)() 'auto (*() const noexcept)()' inline
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:3, col:8> col:3 implicit __invoke 'auto ()' static inline
   // CHECK-NEXT: CompoundStmt 0x{{[^ ]*}} <col:7, col:8>
 
@@ -307,7 +307,7 @@
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:16, col:18> col:3 operator() 'auto (int, ...) const' inline
   // CHECK-NEXT: ParmVarDecl 0x{{[^ ]*}} <col:6, col:10> col:10 a 'int'
   // CHECK-NEXT: CompoundStmt
-  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:18> col:3 implicit constexpr operator auto (*)(int, ...) 'auto (*() const)(int, ...)' inline
+  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:18> col:3 implicit constexpr operator auto (*)(int, ...) 'auto (*() const noexcept)(int, ...)' inline
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:3, col:18> col:3 implicit __invoke 'auto (int, ...)' static inline
   // CHECK-NEXT: ParmVarDecl 0x{{[^ ]*}} <col:6, col:10> col:10 a 'int'
   // CHECK-NEXT: CompoundStmt 0x{{[^ ]*}} <col:17, col:18>
@@ -455,7 +455,7 @@
   // CHECK-NEXT: Destructor
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:8, col:19> col:3 constexpr operator() 'auto () const' inline
   // CHECK-NEXT: CompoundStmt
-  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:19> col:3 implicit constexpr operator auto (*)() 'auto (*() const)()' inline
+  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:19> col:3 implicit constexpr operator auto (*)() 'auto (*() const noexcept)()' inline
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:3, col:19> col:3 implicit __invoke 'auto ()' static inline
   // CHECK-NEXT: CompoundStmt 0x{{[^ ]*}} <col:18, col:19>
 
@@ -471,7 +471,7 @@
   // CHECK-NEXT: Destructor
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:8, col:17> col:3 operator() 'auto ()' inline
   // CHECK-NEXT: CompoundStmt
-  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:17> col:3 implicit constexpr operator auto (*)() 'auto (*() const)()' inline
+  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:17> col:3 implicit constexpr operator auto (*)() 'auto (*() const noexcept)()' inline
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:3, col:17> col:3 implicit __invoke 'auto ()' static inline
   // CHECK-NEXT: CompoundStmt 0x{{[^ ]*}} <col:16, col:17>
 
@@ -487,7 +487,7 @@
   // CHECK-NEXT: Destructor
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:8, col:18> col:3 operator() 'auto () const noexcept' inline
   // CHECK-NEXT: CompoundStmt
-  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:18> col:3 implicit constexpr operator auto (*)() noexcept 'auto (*() const)() noexcept' inline
+  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:18> col:3 implicit constexpr operator auto (*)() noexcept 'auto (*() const noexcept)() noexcept' inline
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:3, col:18> col:3 implicit __invoke 'auto () noexcept' static inline
   // CHECK-NEXT: CompoundStmt 0x{{[^ ]*}} <col:17, col:18>
 
@@ -505,7 +505,7 @@
   // CHECK-NEXT: CompoundStmt
   // CHECK-NEXT: ReturnStmt 0x{{[^ ]*}} <col:17, col:24>
   // CHECK-NEXT: IntegerLiteral 0x{{[^ ]*}} <col:24> 'int' 0
-  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:27> col:3 implicit constexpr operator int (*)() 'auto (*() const)() -> int' inline
+  // CHECK-NEXT: CXXConversionDecl 0x{{[^ ]*}} <col:3, col:27> col:3 implicit constexpr operator int (*)() 'auto (*() const noexcept)() -> int' inline
   // CHECK-NEXT: CXXMethodDecl 0x{{[^ ]*}} <col:3, col:27> col:3 implicit __invoke 'auto () -> int' static inline
   // CHECK-NEXT: CompoundStmt 0x{{[^ ]*}} <col:15, col:27>
   // CHECK-NEXT: ReturnStmt 0x{{[^ ]*}} <col:17, col:24>
@@ -568,4 +568,4 @@
   // CHECK: CallExpr 0x{{[^ ]*}} <line:[[@LINE+1]]:{{[^>]+}}> 'void'{{$}}
   f(x);
 }
-} // namespace test_adl_call_three
\ No newline at end of file
+} // namespace test_adl_call_three
Index: clang/lib/Sema/SemaLambda.cpp
===================================================================
--- clang/lib/Sema/SemaLambda.cpp
+++ clang/lib/Sema/SemaLambda.cpp
@@ -1227,9 +1227,10 @@
   FunctionProtoType::ExtProtoInfo ConvExtInfo(
       S.Context.getDefaultCallingConvention(
       /*IsVariadic=*/false, /*IsCXXMethod=*/true));
-  // The conversion function is always const.
+  // The conversion function is always const and noexcept.
   ConvExtInfo.TypeQuals = Qualifiers();
   ConvExtInfo.TypeQuals.addConst();
+  ConvExtInfo.ExceptionSpec.Type = EST_BasicNoexcept;
   QualType ConvTy =
       S.Context.getFunctionType(PtrToFunctionTy, None, ConvExtInfo);

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[PATCH] D56992: [clang] Mark lambda-to-function-pointer conversion as noexcept

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