[llvm] [clang] [AIX][TOC] Add -mtocdata/-mno-tocdata options on AIX (PR #67999)

[Zaara Syeda via cfe-commits]

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@@ -265,6 +269,63 @@ bool AIXTargetCodeGenInfo::initDwarfEHRegSizeTable(
   return PPC_initDwarfEHRegSizeTable(CGF, Address, Is64Bit, /*IsAIX*/ true);
 }
 
+void AIXTargetCodeGenInfo::setTargetAttributes(
+    const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
+  if (auto *GVar = dyn_cast<llvm::GlobalVariable>(GV)) {
+    auto GVId = M.getMangledName(dyn_cast<NamedDecl>(D));
+
+    // Is this a global variable specified by the user as toc-data?
+    bool UserSpecifiedTOC =
+        llvm::binary_search(M.getCodeGenOpts().TocDataVarsUserSpecified, GVId);
+    // Assumes the same variable cannot be in both TocVarsUserSpecified and
+    // NoTocVars.
+    if (UserSpecifiedTOC ||
+        ((M.getCodeGenOpts().AllTocData) &&
+         !llvm::binary_search(M.getCodeGenOpts().NoTocDataVars, GVId))) {
+      const unsigned long PointerSize =
+          GV->getParent()->getDataLayout().getPointerSizeInBits() / 8;
+      ASTContext &Context = D->getASTContext();
+      auto *VarD = dyn_cast<VarDecl>(D);
+      assert(VarD && "Invalid declaration of global variable.");
+
+      unsigned Alignment = Context.toBits(Context.getDeclAlign(D)) / 8;
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syzaara wrote:

There is multiple places where Context is used, so I will keep it this way.

https://github.com/llvm/llvm-project/pull/67999