[clang] [alpha.webkit.UncountedCallArgsChecker] Add a few more safe functions to call. (PR #81527)

[Ryosuke Niwa via cfe-commits]

https://github.com/rniwa created https://github.com/llvm/llvm-project/pull/81527

Added checkedDowncast, uncheckedDowncast, & toString as safe functions to call.

>From c67d64d7ca5885b03b6e0738d5e237ccbd3ed38a Mon Sep 17 00:00:00 2001
From: Ryosuke Niwa <rniwa at webkit.org>
Date: Mon, 12 Feb 2024 12:31:37 -0800
Subject: [PATCH] [alpha.webkit.UncountedCallArgsChecker] Add a few more safe
 functions to call.

Added checkedDowncast, uncheckedDowncast, & toString as safe functions to call.
---
 .../Checkers/WebKit/PtrTypesSemantics.cpp     |  5 +++--
 .../WebKit/UncountedCallArgsChecker.cpp       | 12 ++++++-----
 ...ncast.cpp => call-args-safe-functions.cpp} | 21 +++++++++++++++++++
 3 files changed, 31 insertions(+), 7 deletions(-)
 rename clang/test/Analysis/Checkers/WebKit/{call-args-dynamic-downcast.cpp => call-args-safe-functions.cpp} (55%)

diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
index d2b66341058000..e2c19ef43be132 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
@@ -192,8 +192,9 @@ bool isPtrConversion(const FunctionDecl *F) {
   // FIXME: check # of params == 1
   const auto FunctionName = safeGetName(F);
   if (FunctionName == "getPtr" || FunctionName == "WeakPtr" ||
-      FunctionName == "dynamicDowncast"
-      || FunctionName == "downcast" || FunctionName == "bitwise_cast")
+      FunctionName == "dynamicDowncast" || FunctionName == "downcast" ||
+      FunctionName == "checkedDowncast" || FunctionName == "uncheckedDowncast" || 
+      FunctionName == "bitwise_cast")
     return true;
 
   return false;
diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedCallArgsChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedCallArgsChecker.cpp
index 31ccae8b097b89..5d5fce2867f99b 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedCallArgsChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/UncountedCallArgsChecker.cpp
@@ -148,13 +148,15 @@ class UncountedCallArgsChecker
 
     auto name = safeGetName(Callee);
     if (name == "adoptRef" || name == "getPtr" || name == "WeakPtr" ||
-        name == "dynamicDowncast" || name == "downcast" || name == "bitwise_cast" ||
-        name == "is" || name == "equal" || name == "hash" ||
-        name == "isType"
+        name == "dynamicDowncast" || name == "downcast" ||
+        name == "checkedDowncast" || name == "uncheckedDowncast" ||
+        name == "bitwise_cast" || name == "is" || name == "equal" ||
+        name == "hash" || name == "isType" ||
         // FIXME: Most/all of these should be implemented via attributes.
-        || name == "equalIgnoringASCIICase" ||
+        name == "equalIgnoringASCIICase" ||
         name == "equalIgnoringASCIICaseCommon" ||
-        name == "equalIgnoringNullity")
+        name == "equalIgnoringNullity" ||
+        name == "toString")
       return true;
 
     return false;
diff --git a/clang/test/Analysis/Checkers/WebKit/call-args-dynamic-downcast.cpp b/clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
similarity index 55%
rename from clang/test/Analysis/Checkers/WebKit/call-args-dynamic-downcast.cpp
rename to clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
index 28156623d9a0fd..a87446564870cd 100644
--- a/clang/test/Analysis/Checkers/WebKit/call-args-dynamic-downcast.cpp
+++ b/clang/test/Analysis/Checkers/WebKit/call-args-safe-functions.cpp
@@ -23,13 +23,34 @@ class OtherObject {
     Derived* obj();
 };
 
+class String {
+};
+
 template<typename Target, typename Source>
 inline Target* dynamicDowncast(Source* source)
 {
     return static_cast<Target*>(source);
 }
 
+template<typename Target, typename Source>
+inline Target* checkedDowncast(Source* source)
+{
+    return static_cast<Target*>(source);
+}
+
+template<typename Target, typename Source>
+inline Target* uncheckedDowncast(Source* source)
+{
+    return static_cast<Target*>(source);
+}
+
+template<typename... Types>
+String toString(const Types&... values);
+
 void foo(OtherObject* other)
 {
     dynamicDowncast<SubDerived>(other->obj());
+    checkedDowncast<SubDerived>(other->obj());
+    uncheckedDowncast<SubDerived>(other->obj());
+    toString(other->obj());
 }