[llvm] [llvm][Support] Add indirection to call correct validate(...) function (PR #71966)

[via llvm-commits]

https://github.com/arrv-sc updated https://github.com/llvm/llvm-project/pull/71966

>From 51531b2ed8886774698f2b677dbfc623ac47d88d Mon Sep 17 00:00:00 2001
From: Alexander Romanov <alexander.romanov at syntacore.com>
Date: Thu, 14 Dec 2023 11:23:32 +0300
Subject: [PATCH] [llvm][Support] Add indirection to call correct validate(...)
 function     Previously "yamlize" overload for validatedMappingTraits was    
 unconditionally calling "MappingTraits<T>::validate" even if    
 "MappingContextTraits<T, Context>" was passed to it. Therefore    
 compilation failed when specifying    
 "MappingContextTraits<T,Context>::validate()"

---
 llvm/include/llvm/Support/YAMLTraits.h | 17 +++++++++++++++--
 llvm/unittests/Support/YAMLIOTest.cpp  |  3 +++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/Support/YAMLTraits.h b/llvm/include/llvm/Support/YAMLTraits.h
index 99074105a55698..3b1f4bad57fcf1 100644
--- a/llvm/include/llvm/Support/YAMLTraits.h
+++ b/llvm/include/llvm/Support/YAMLTraits.h
@@ -1058,6 +1058,19 @@ yamlize(IO &io, T &Val, bool, EmptyContext &Ctx) {
   }
 }
 
+namespace detail {
+
+template <typename T, typename Context>
+std::string doValidate(IO &io, T &Val, Context &Ctx) {
+  return MappingContextTraits<T, Context>::validate(io, Val, Ctx);
+}
+
+template <typename T> std::string doValidate(IO &io, T &Val, EmptyContext &) {
+  return MappingTraits<T>::validate(io, Val);
+}
+
+} // namespace detail
+
 template <typename T, typename Context>
 std::enable_if_t<validatedMappingTraits<T, Context>::value, void>
 yamlize(IO &io, T &Val, bool, Context &Ctx) {
@@ -1066,7 +1079,7 @@ yamlize(IO &io, T &Val, bool, Context &Ctx) {
   else
     io.beginMapping();
   if (io.outputting()) {
-    std::string Err = MappingTraits<T>::validate(io, Val);
+    std::string Err = detail::doValidate(io, Val, Ctx);
     if (!Err.empty()) {
       errs() << Err << "\n";
       assert(Err.empty() && "invalid struct trying to be written as yaml");
@@ -1074,7 +1087,7 @@ yamlize(IO &io, T &Val, bool, Context &Ctx) {
   }
   detail::doMapping(io, Val, Ctx);
   if (!io.outputting()) {
-    std::string Err = MappingTraits<T>::validate(io, Val);
+    std::string Err = detail::doValidate(io, Val, Ctx);
     if (!Err.empty())
       io.setError(Err);
   }
diff --git a/llvm/unittests/Support/YAMLIOTest.cpp b/llvm/unittests/Support/YAMLIOTest.cpp
index 488746764ae655..401981f3841ee2 100644
--- a/llvm/unittests/Support/YAMLIOTest.cpp
+++ b/llvm/unittests/Support/YAMLIOTest.cpp
@@ -2623,6 +2623,9 @@ template <> struct MappingContextTraits<SimpleMap, MappingContext> {
     ++Context.A;
     io.mapRequired("Context", Context.A);
   }
+  static std::string validate(IO &io, SimpleMap &sm, MappingContext &Context) {
+    return "";
+  }
 };
 
 template <> struct MappingTraits<NestedMap> {