From eef2b43463cb3e8349c2cd54d813f498d2d68a0b Mon Sep 17 00:00:00 2001
From: Martin Liska <martin.liska@melowntech.com>
Date: Sun, 8 Oct 2023 11:05:21 +0200
Subject: [PATCH] LLVM 18: port to latest master

Fixes:
error: 'const class clang::DependentFunctionTemplateSpecializationInfo' has no member named 'getNumTemplates'
---
 clang_delta/RemoveUnusedFunction.cpp | 32 +++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/clang_delta/RemoveUnusedFunction.cpp b/clang_delta/RemoveUnusedFunction.cpp
index 0252fc1f..ca9d3f7b 100644
--- a/clang_delta/RemoveUnusedFunction.cpp
+++ b/clang_delta/RemoveUnusedFunction.cpp
@@ -215,11 +215,23 @@ bool RUFAnalysisVisitor::VisitFunctionDecl(FunctionDecl *FD)
       FD->getDependentSpecializationInfo();
     // don't need to track all specs, just associate FD with one
     // of those
+    const FunctionDecl *Member = nullptr;
+
+#if LLVM_VERSION_MAJOR >= 18
+    ArrayRef<FunctionTemplateDecl *> members = Info->getCandidates();
+    if (!members.empty()) {
+      Member = members[0]->getTemplatedDecl();
+    }
+#else
     if (Info->getNumTemplates() > 0) {
-      const FunctionDecl *Member =
+      Member =
         Info->getTemplate(0)->getTemplatedDecl();
-      ConsumerInstance->addOneMemberSpecialization(FD, Member);
     }
+#endif
+
+    if (Member != nullptr)
+      ConsumerInstance->addOneMemberSpecialization(FD, Member);
+
     return true;
   }
 
@@ -921,11 +933,21 @@ void RemoveUnusedFunction::handleOneFunctionDecl(const FunctionDecl *TheFD)
       TheFD->getDependentSpecializationInfo();
     // don't need to track all specs, just associate FD with one
     // of those
+    const FunctionDecl *Member = nullptr;
+
+#if LLVM_VERSION_MAJOR >= 18
+    ArrayRef<FunctionTemplateDecl *> members = Info->getCandidates();
+    if (!members.empty()) {
+      Member = members[0]->getTemplatedDecl();
+    }
+#else
     if (Info->getNumTemplates() > 0) {
-      const FunctionDecl *Member =
-        Info->getTemplate(0)->getTemplatedDecl();
-      createFuncToExplicitSpecs(Member);
+      Member = Info->getTemplate(0)->getTemplatedDecl();
     }
+#endif
+
+    if (Member != nullptr)
+      createFuncToExplicitSpecs(Member);
     return;
   }