[clang] Return null expr when a negative array was created. (PR #71552)

[via cfe-commits]

https://github.com/lwshanbd created https://github.com/llvm/llvm-project/pull/71552

Fix #69198 


>From 009afe8df3f17ba3b0f793ce144b8be41b15c90d Mon Sep 17 00:00:00 2001
From: Baodi Shan <lwshanbd at gmail.com>
Date: Tue, 7 Nov 2023 11:06:14 -0500
Subject: [PATCH] Return null expr when a negative array was created. Fix
 llvm#69198

---
 clang/lib/AST/Expr.cpp        | 6 +++---
 clang/lib/Sema/SemaOpenMP.cpp | 2 ++
 clang/test/OpenMP/bug69198.c  | 8 ++++++++
 3 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 clang/test/OpenMP/bug69198.c

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 74a9c49a795b4fc..55c6b732b7081f4 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -4983,10 +4983,10 @@ QualType OMPArraySectionExpr::getBaseOriginalType(const Expr *Base) {
   for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
     if (OriginalTy->isAnyPointerType())
       OriginalTy = OriginalTy->getPointeeType();
-    else {
-      assert (OriginalTy->isArrayType());
+    else if (OriginalTy->isArrayType())
       OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();
-    }
+    else
+      return {};
   }
   return OriginalTy;
 }
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index e05fa54d8118319..dcdd6e7a3f5c762 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -21014,6 +21014,8 @@ Sema::ActOnOpenMPDependClause(const OMPDependClause::DependDataTy &Data,
           if (OASE) {
             QualType BaseType =
                 OMPArraySectionExpr::getBaseOriginalType(OASE->getBase());
+            if (BaseType.isNull())
+              return nullptr;
             if (const auto *ATy = BaseType->getAsArrayTypeUnsafe())
               ExprTy = ATy->getElementType();
             else
diff --git a/clang/test/OpenMP/bug69198.c b/clang/test/OpenMP/bug69198.c
new file mode 100644
index 000000000000000..ca80d994ea051b0
--- /dev/null
+++ b/clang/test/OpenMP/bug69198.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -verify -fopenmp -x c -triple x86_64-apple-darwin10 %s
+// expected-no-diagnostics
+
+int c[-1];
+
+void foo (){
+  #pragma omp task depend(inout: c[:][:])
+}