[clang] [llvm] [WIP] ABI Lowering Library (PR #140112)

[Nikita Popov via llvm-commits]

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@@ -872,20 +895,122 @@ const CGFunctionInfo &CodeGenTypes::arrangeLLVMFunctionInfo(
   } else if (info.getCC() == CC_Swift || info.getCC() == CC_SwiftAsync) {
     swiftcall::computeABIInfo(CGM, *FI);
   } else {
-    CGM.getABIInfo().computeInfo(*FI);
+    if (isBPF)
+      CGM.fetchABIInfo(TB).computeInfo(*tempFI);
+    else
+      CGM.getABIInfo().computeInfo(*FI);
   }
 
   // Loop over all of the computed argument and return value info.  If any of
   // them are direct or extend without a specified coerce type, specify the
   // default now.
-  ABIArgInfo &retInfo = FI->getReturnInfo();
-  if (retInfo.canHaveCoerceToType() && retInfo.getCoerceToType() == nullptr)
-    retInfo.setCoerceToType(ConvertType(FI->getReturnType()));
+  if (isBPF && tempFI) {
+    llvm::ABITypeMapper ReverseMapper(getLLVMContext());
 
-  for (auto &I : FI->arguments())
-    if (I.info.canHaveCoerceToType() && I.info.getCoerceToType() == nullptr)
-      I.info.setCoerceToType(ConvertType(I.type));
+    const auto &abiRetInfo = tempFI->getReturnInfo();
+    ABIArgInfo &cgRetInfo = FI->getReturnInfo();
+
+    if (abiRetInfo.isDirect()) {
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nikic wrote:

We should have a separate function for converting the ABIArgInfo, so it's not repeated for returns and args.

https://github.com/llvm/llvm-project/pull/140112