Prepare compilerplugins for C++23 `if consteval`

...for which clang::IfStmt::getCond returns null

Change-Id: I8b86a033d52de87dedbdf6d867f2b3d3f57c1b5a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/148979
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

3 files changed, 25 insertions, 13 deletions

diff --git a/compilerplugins/clang/simplifydynamiccast.cxx b/compilerplugins/clang/simplifydynamiccast.cxx
index ffb81658d8c8..3b94f284de1e 100644
--- a/compilerplugins/clang/simplifydynamiccast.cxx
+++ b/compilerplugins/clang/simplifydynamiccast.cxx
@@ -46,15 +46,19 @@ private:
 
 bool SimplifyDynamicCast::TraverseIfStmt(IfStmt* ifStmt)
 {
-    auto condExpr = ifStmt->getCond()->IgnoreParenImpCasts();
-    auto dynamicCastExpr = dyn_cast<CXXDynamicCastExpr>(condExpr);
-    if (!dynamicCastExpr)
+    CXXDynamicCastExpr const* dynamicCastExpr = nullptr;
+    if (Expr const* condExpr = ifStmt->getCond())
     {
-        if (auto binaryOp = dyn_cast<BinaryOperator>(condExpr))
+        condExpr = condExpr->IgnoreParenImpCasts();
+        dynamicCastExpr = dyn_cast<CXXDynamicCastExpr>(condExpr);
+        if (!dynamicCastExpr)
         {
-            if (binaryOp->getOpcode() == BO_NE)
-                dynamicCastExpr
-                    = dyn_cast<CXXDynamicCastExpr>(binaryOp->getLHS()->IgnoreParenImpCasts());
+            if (auto binaryOp = dyn_cast<BinaryOperator>(condExpr))
+            {
+                if (binaryOp->getOpcode() == BO_NE)
+                    dynamicCastExpr
+                        = dyn_cast<CXXDynamicCastExpr>(binaryOp->getLHS()->IgnoreParenImpCasts());
+            }
         }
     }
     Decl const* subExprDecl = nullptr;
diff --git a/compilerplugins/clang/simplifypointertobool.cxx b/compilerplugins/clang/simplifypointertobool.cxx
index 097a78e16f67..11aed0f317b7 100644
--- a/compilerplugins/clang/simplifypointertobool.cxx
+++ b/compilerplugins/clang/simplifypointertobool.cxx
@@ -131,14 +131,20 @@ public:
 
     bool PreTraverseIfStmt(IfStmt* stmt)
     {
-        contextuallyConvertedExprs_.push_back(stmt->getCond()->IgnoreParenImpCasts());
+        if (auto const cond = stmt->getCond())
+        {
+            contextuallyConvertedExprs_.push_back(cond->IgnoreParenImpCasts());
+        }
         return true;
     }
 
-    bool PostTraverseIfStmt(IfStmt*, bool)
+    bool PostTraverseIfStmt(IfStmt* stmt, bool)
     {
-        assert(!contextuallyConvertedExprs_.empty());
-        contextuallyConvertedExprs_.pop_back();
+        if (stmt->getCond() != nullptr)
+        {
+            assert(!contextuallyConvertedExprs_.empty());
+            contextuallyConvertedExprs_.pop_back();
+        }
         return true;
     }
 
diff --git a/compilerplugins/clang/unnecessaryparen.cxx b/compilerplugins/clang/unnecessaryparen.cxx
index 11655d51389e..1d11aca4ab47 100644
--- a/compilerplugins/clang/unnecessaryparen.cxx
+++ b/compilerplugins/clang/unnecessaryparen.cxx
@@ -262,8 +262,10 @@ bool UnnecessaryParen::VisitParenExpr(const ParenExpr* parenExpr)
 
 bool UnnecessaryParen::VisitIfStmt(const IfStmt* ifStmt)
 {
-    handleUnreachableCodeConditionParens(ifStmt->getCond());
-    VisitSomeStmt(ifStmt, ifStmt->getCond(), "if");
+    if (auto const cond = ifStmt->getCond()) {
+        handleUnreachableCodeConditionParens(cond);
+        VisitSomeStmt(ifStmt, cond, "if");
+    }
     return true;
 }