IRGen: We need to map the direct type error explosion back to the native result in IRGenThunk

rdar://134730970

Author: aschwaighofer

lib/IRGen/GenCall.cpp

@@ -6503,3 +6503,46 @@ llvm::FunctionType *FunctionPointer::getFunctionType() const {
 
   return Sig.getType();
 }
+
+void irgen::buildDirectError(IRGenFunction &IGF,
+                             const CombinedResultAndErrorType &combined,
+                             const NativeConventionSchema &errorSchema,
+                             SILType silErrorTy, Explosion &errorResult,
+                             bool forAsync, Explosion &out) {
+  if (combined.combinedTy->isVoidTy()) {
+    return;
+  }
+
+  llvm::Value *expandedResult = llvm::UndefValue::get(combined.combinedTy);
+  auto *structTy = dyn_cast<llvm::StructType>(combined.combinedTy);
+
+  if (!errorSchema.getExpandedType(IGF.IGM)->isVoidTy()) {
+    auto nativeError =
+        errorSchema.mapIntoNative(IGF.IGM, IGF, errorResult, silErrorTy, false);
+
+    if (structTy) {
+      for (unsigned i : combined.errorValueMapping) {
+        llvm::Value *elt = nativeError.claimNext();
+        auto *nativeTy = structTy->getElementType(i);
+        elt = convertForDirectError(IGF, elt, nativeTy,
+                                    /*forExtraction*/ false);
+        expandedResult = IGF.Builder.CreateInsertValue(expandedResult, elt, i);
+      }
+      if (forAsync) {
+        IGF.emitAllExtractValues(expandedResult, structTy, out);
+      } else {
+        out = expandedResult;
+      }
+    } else if (!errorSchema.getExpandedType(IGF.IGM)->isVoidTy()) {
+      out = convertForDirectError(IGF, nativeError.claimNext(),
+                                  combined.combinedTy,
+                                  /*forExtraction*/ false);
+    }
+  } else {
+    if (forAsync && structTy) {
+      IGF.emitAllExtractValues(expandedResult, structTy, out);
+    } else {
+      out = expandedResult;
+    }
+  }
+}

lib/IRGen/GenCall.h

@@ -278,6 +278,11 @@ namespace irgen {
   llvm::Value *convertForDirectError(IRGenFunction &IGF, llvm::Value *value,
                                      llvm::Type *toTy, bool forExtraction);
 
+  void buildDirectError(IRGenFunction &IGF,
+                        const CombinedResultAndErrorType &combined,
+                        const NativeConventionSchema &errorSchema,
+                        SILType silErrorTy, Explosion &errorResult,
+                        bool forAsync, Explosion &out);
 } // end namespace irgen
 } // end namespace swift
 

lib/IRGen/GenThunk.cpp

@@ -406,7 +406,21 @@ void IRGenThunk::emit() {
       errorArgValues.add(errorValue);
       emitAsyncReturn(IGF, *asyncLayout, origTy, errorArgValues.claimAll());
     } else {
-      IGF.emitScalarReturn(IGF.CurFn->getReturnType(), *error);
+      if (!error->empty()) {
+        // Map the direct error explosion from the call back to the native
+        // explosion for the return.
+        SILType silErrorTy = conv.getSILErrorType(expansionContext);
+        auto &errorTI = IGF.IGM.getTypeInfo(silErrorTy);
+        auto &errorSchema = errorTI.nativeReturnValueSchema(IGF.IGM);
+        auto combined =
+            combineResultAndTypedErrorType(IGF.IGM, schema, errorSchema);
+        Explosion nativeAgg;
+        buildDirectError(IGF, combined, errorSchema, silErrorTy, *error,
+                         /*forAsync*/ false, nativeAgg);
+        IGF.emitScalarReturn(IGF.CurFn->getReturnType(), nativeAgg);
+      } else {
+        IGF.emitScalarReturn(IGF.CurFn->getReturnType(), *error);
+      }
     }
     IGF.Builder.emitBlock(successBB);
   } else {

lib/IRGen/IRGenSIL.cpp

@@ -4419,48 +4419,6 @@ void IRGenSILFunction::visitThrowInst(swift::ThrowInst *i) {
                               getSILModule());
   assert(!conv.hasIndirectSILErrorResults());
 
-  auto buildDirectError = [=](const CombinedResultAndErrorType &combined,
-                              const NativeConventionSchema &errorSchema,
-                              SILType silErrorTy, Explosion &errorResult,
-                              bool forAsync, Explosion &out) {
-    if (combined.combinedTy->isVoidTy()) {
-      return;
-    }
-
-    llvm::Value *expandedResult = llvm::UndefValue::get(combined.combinedTy);
-    auto *structTy = dyn_cast<llvm::StructType>(combined.combinedTy);
-
-    if (!errorSchema.getExpandedType(IGM)->isVoidTy()) {
-      auto nativeError =
-          errorSchema.mapIntoNative(IGM, *this, errorResult, silErrorTy, false);
-
-      if (structTy) {
-        for (unsigned i : combined.errorValueMapping) {
-          llvm::Value *elt = nativeError.claimNext();
-          auto *nativeTy = structTy->getElementType(i);
-          elt = convertForDirectError(*this, elt, nativeTy,
-                                      /*forExtraction*/ false);
-          expandedResult = Builder.CreateInsertValue(expandedResult, elt, i);
-        }
-        if (forAsync) {
-          emitAllExtractValues(expandedResult, structTy, out);
-        } else {
-          out = expandedResult;
-        }
-      } else if (!errorSchema.getExpandedType(IGM)->isVoidTy()) {
-        out =
-            convertForDirectError(*this, nativeError.claimNext(),
-                                  combined.combinedTy, /*forExtraction*/ false);
-      }
-    } else {
-      if (forAsync && structTy) {
-        emitAllExtractValues(expandedResult, structTy, out);
-      } else {
-        out = expandedResult;
-      }
-    }
-  };
-
   if (!isAsync()) {
     auto fnTy = CurFn->getFunctionType();
     auto retTy = fnTy->getReturnType();
@@ -4493,7 +4451,8 @@ void IRGenSILFunction::visitThrowInst(swift::ThrowInst *i) {
           auto combined =
               combineResultAndTypedErrorType(IGM, resultSchema, errorSchema);
           Explosion nativeAgg;
-          buildDirectError(combined, errorSchema, silErrorTy, errorResult,
+          buildDirectError(*this, combined, errorSchema, silErrorTy,
+                           errorResult,
                            /*forAsync*/ false, nativeAgg);
 
           emitScalarReturn(combined.combinedTy, nativeAgg);
@@ -4543,7 +4502,7 @@ void IRGenSILFunction::visitThrowInst(swift::ThrowInst *i) {
         Explosion nativeAgg;
         auto combined =
             combineResultAndTypedErrorType(IGM, resultSchema, errorSchema);
-        buildDirectError(combined, errorSchema, silErrorTy, exn,
+        buildDirectError(*this, combined, errorSchema, silErrorTy, exn,
                          /*forAsync*/ true, nativeAgg);
         assert(exn.empty() && "Unclaimed typed error results");