[clang] [Serialization] Check for stack exhaustion when reading declarations (PR #79875)

[Chuanqi Xu via cfe-commits]

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@@ -4099,7 +4099,9 @@ Decl *ASTReader::ReadDeclRecord(DeclID ID) {
   // calls to Decl::getASTContext() by Decl's methods will find the
   // TranslationUnitDecl without crashing.
   D->setDeclContext(Context.getTranslationUnitDecl());
-  Reader.Visit(D);
+
+  // Reading some declarations can result in deep recursion.
+  SemaObj->runWithSufficientStackSpace(DeclLoc, [&] { Reader.Visit(D); });
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ChuanqiXu9 wrote:

As I said, for example, if we're compiling a pcm file to an object file. It makes sense that the Sema is not needed here.

https://github.com/llvm/llvm-project/pull/79875