[clang] [NFC][Clang] Fix potential dereferencing of nullptr (PR #86759)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-codegen

@llvm/pr-subscribers-clang

Author: None (smanna12)

<details>
<summary>Changes</summary>

This patch replaces dyn_cast&lt;&gt; with cast&lt;&gt; to resolve potential 
static analyzer bugs for

1. Dereferencing a pointer issue with nullptr GVar when calling addAttribute() 
in AIXTargetCodeGenInfo::setTargetAttributes(clang::Decl const *, 
llvm::GlobalValue *, clang::CodeGen::CodeGenModule &amp;).

2. Dereferencing a pointer issue with nullptr GG when calling 
getCorrespondingConstructor() in 
DeclareImplicitDeductionGuidesForTypeAlias(clang::Sema &amp;, 
clang::TypeAliasTemplateDecl *, clang::SourceLocation).

3. Dereferencing a pointer issue with nullptr CurrentBT when calling getKind() 
in ComplexExprEmitter::GetHigherPrecisionFPType(clang::QualType).

---
Full diff: https://github.com/llvm/llvm-project/pull/86759.diff


3 Files Affected:

- (modified) clang/lib/CodeGen/CGExprComplex.cpp (+1-1) 
- (modified) clang/lib/CodeGen/Targets/PPC.cpp (+1-1) 
- (modified) clang/lib/Sema/SemaTemplate.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp 
b/clang/lib/CodeGen/CGExprComplex.cpp
index b873bc6737bb0a..c3774d0cb75edc 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -289,7 +289,7 @@ class ComplexExprEmitter
                                         const BinOpInfo &Op);
 
   QualType GetHigherPrecisionFPType(QualType ElementType) {
-    const auto *CurrentBT = dyn_cast<BuiltinType>(ElementType);
+    const auto *CurrentBT = cast<BuiltinType>(ElementType);
     switch (CurrentBT->getKind()) {
     case BuiltinType::Kind::Float16:
       return CGF.getContext().FloatTy;
diff --git a/clang/lib/CodeGen/Targets/PPC.cpp 
b/clang/lib/CodeGen/Targets/PPC.cpp
index 00b04723f17dd2..3eadb19bd2058f 100644
--- a/clang/lib/CodeGen/Targets/PPC.cpp
+++ b/clang/lib/CodeGen/Targets/PPC.cpp
@@ -274,7 +274,7 @@ void AIXTargetCodeGenInfo::setTargetAttributes(
   if (!isa<llvm::GlobalVariable>(GV))
     return;
 
-  auto *GVar = dyn_cast<llvm::GlobalVariable>(GV);
+  auto *GVar = cast<llvm::GlobalVariable>(GV);
   auto GVId = GV->getName();
 
   // Is this a global variable specified by the user as toc-data?
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 005529a53270c3..aab72dbaf48c46 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -2974,7 +2974,7 @@ void DeclareImplicitDeductionGuidesForTypeAlias(
     if (auto *FPrime = SemaRef.InstantiateFunctionDeclaration(
             F, TemplateArgListForBuildingFPrime, AliasTemplate->getLocation(),
             Sema::CodeSynthesisContext::BuildingDeductionGuides)) {
-      auto *GG = dyn_cast<CXXDeductionGuideDecl>(FPrime);
+      auto *GG = cast<CXXDeductionGuideDecl>(FPrime);
       buildDeductionGuide(SemaRef, AliasTemplate, FPrimeTemplateParamList,
                           GG->getCorrespondingConstructor(),
                           GG->getExplicitSpecifier(), GG->getTypeSourceInfo(),

``````````

</details>


https://github.com/llvm/llvm-project/pull/86759
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