[clang-tidy] Added check to disable bugprone-infinite-loop on known false condition

Summary: Addresses [[ https://bugs.llvm.org/show_bug.cgi?id=44816 | bugprone-infinite-loop false positive with CATCH2 ]] by disabling the check on loops where the condition is known to always eval as false, in other words not a loop.

Reviewers: aaron.ballman, alexfh, hokein, gribozavr2, JonasToth

Reviewed By: gribozavr2

Subscribers: xazax.hun, cfe-commits

Tags: #clang, #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D74374
diff --git a/clang-tools-extra/clang-tidy/bugprone/InfiniteLoopCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/InfiniteLoopCheck.cpp
index 5a70537..0079300 100644
--- a/clang-tools-extra/clang-tidy/bugprone/InfiniteLoopCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/InfiniteLoopCheck.cpp
@@ -152,6 +152,13 @@
   return Result;
 }
 
+static bool isKnownFalse(const Expr &Cond, const ASTContext &Ctx) {
+  bool Result = false;
+  if (Cond.EvaluateAsBooleanCondition(Result, Ctx))
+    return !Result;
+  return false;
+}
+
 void InfiniteLoopCheck::registerMatchers(MatchFinder *Finder) {
   const auto LoopCondition = allOf(
       hasCondition(
@@ -170,6 +177,9 @@
   const auto *LoopStmt = Result.Nodes.getNodeAs<Stmt>("loop-stmt");
   const auto *Func = Result.Nodes.getNodeAs<FunctionDecl>("func");
 
+  if (isKnownFalse(*Cond, *Result.Context))
+    return;
+
   bool ShouldHaveConditionVariables = true;
   if (const auto *While = dyn_cast<WhileStmt>(LoopStmt)) {
     if (const VarDecl *LoopVarDecl = While->getConditionVariable()) {