Mangling for suspend/await resume partial functions

docs/ABI/Mangling.rst

@@ -148,6 +148,8 @@ Globals
   global ::= mangled-name 'TA'                     // partial application forwarder
   global ::= mangled-name 'Ta'                     // ObjC partial application forwarder
   global ::= mangled-name 'Tw' index               // async partial apply thunk for a non-constant function
+  global ::= mangled-name 'TQ' index               // Async await continuation partial function
+  global ::= mangled-name 'TY' index               // Async suspend continuation partial function
 
   global ::= type 'w' VALUE-WITNESS-KIND // value witness
 

include/swift/Demangling/DemangleNodes.def

@@ -317,6 +317,8 @@ NODE(AutoDiffDerivativeVTableThunk)
 NODE(DifferentiabilityWitness)
 NODE(IndexSubset)
 NODE(AsyncNonconstantPartialApplyThunk)
+NODE(AsyncAwaitResumePartialFunction)
+NODE(AsyncSuspendResumePartialFunction)
 
 #undef CONTEXT_NODE
 #undef NODE

lib/Demangling/Demangler.cpp

@@ -124,6 +124,8 @@ bool swift::Demangle::isFunctionAttr(Node::Kind kind) {
     case Node::Kind::DynamicallyReplaceableFunctionVar:
     case Node::Kind::AsyncFunctionPointer:
     case Node::Kind::AsyncNonconstantPartialApplyThunk:
+    case Node::Kind::AsyncAwaitResumePartialFunction:
+    case Node::Kind::AsyncSuspendResumePartialFunction:
       return true;
     default:
       return false;
@@ -2297,6 +2299,14 @@ NodePointer Demangler::demangleThunkOrSpecialization() {
     case 'X': return createNode(Node::Kind::DynamicallyReplaceableFunctionVar);
     case 'x': return createNode(Node::Kind::DynamicallyReplaceableFunctionKey);
     case 'I': return createNode(Node::Kind::DynamicallyReplaceableFunctionImpl);
+    case 'Y':
+    case 'Q': {
+      NodePointer discriminator = demangleIndexAsNode();
+      return createWithChild(
+          c == 'Q' ? Node::Kind::AsyncAwaitResumePartialFunction :
+             /*'Y'*/ Node::Kind::AsyncSuspendResumePartialFunction,
+          discriminator);
+    }
     case 'C': {
       NodePointer type = popNode(Node::Kind::Type);
       return createWithChild(Node::Kind::CoroutineContinuationPrototype, type);

lib/Demangling/NodePrinter.cpp

@@ -574,6 +574,8 @@ class NodePrinter {
     case Node::Kind::DifferentiabilityWitness:
     case Node::Kind::IndexSubset:
     case Node::Kind::AsyncNonconstantPartialApplyThunk:
+    case Node::Kind::AsyncAwaitResumePartialFunction:
+    case Node::Kind::AsyncSuspendResumePartialFunction:
       return false;
     }
     printer_unreachable("bad node kind");
@@ -2781,7 +2783,20 @@ NodePointer NodePrinter::print(NodePointer Node, bool asPrefixContext) {
     Printer << ")";
     Printer << " thunk for non-constant partial apply in ";
     return nullptr;
+  case Node::Kind::AsyncAwaitResumePartialFunction:
+    Printer << "(";
+    print(Node->getChild(0));
+    Printer << ")";
+    Printer << " await resume partial function for ";
+    return nullptr;
+  case Node::Kind::AsyncSuspendResumePartialFunction:
+    Printer << "(";
+    print(Node->getChild(0));
+    Printer << ")";
+    Printer << " suspend resume partial function for ";
+    return nullptr;
   }
+
   printer_unreachable("bad node kind!");
 }
 

lib/Demangling/OldRemangler.cpp

@@ -610,6 +610,13 @@ void Remangler::mangleAsyncNonconstantPartialApplyThunk(Node *node) {
   unreachable("unsupported");
 }
 
+void Remangler::mangleAsyncAwaitResumePartialFunction(Node *node) {
+  unreachable("unsupported");
+}
+void Remangler::mangleAsyncSuspendResumePartialFunction(Node *node) {
+  unreachable("unsupported");
+}
+
 void Remangler::mangleDirectness(Node *node) {
   auto getChar = [](Directness d) -> char {
     switch (d) {

lib/Demangling/Remangler.cpp

@@ -1397,6 +1397,8 @@ void Remangler::mangleGlobal(Node *node) {
       case Node::Kind::DynamicallyReplaceableFunctionVar:
       case Node::Kind::AsyncFunctionPointer:
       case Node::Kind::AsyncNonconstantPartialApplyThunk:
+      case Node::Kind::AsyncAwaitResumePartialFunction:
+      case Node::Kind::AsyncSuspendResumePartialFunction:
         mangleInReverseOrder = true;
         break;
       default:
@@ -1910,6 +1912,16 @@ void Remangler::mangleAsyncNonconstantPartialApplyThunk(Node *node) {
   mangleChildNode(node, 0);
 }
 
+void Remangler::mangleAsyncAwaitResumePartialFunction(Node *node) {
+  Buffer << "TQ";
+  mangleChildNode(node, 0);
+}
+
+void Remangler::mangleAsyncSuspendResumePartialFunction(Node *node) {
+  Buffer << "TY";
+  mangleChildNode(node, 0);
+}
+
 void Remangler::manglePostfixOperator(Node *node) {
   mangleIdentifierImpl(node, /*isOperator*/ true);
   Buffer << "oP";

test/Demangle/Inputs/manglings.txt

@@ -390,3 +390,5 @@ $s13test_mangling3fooyS2f_xq_t16_Differentiation14DifferentiableR_r0_lFAcDRzAcDR
 $s5async1hyyS2iJXEF ---> async.h(@concurrent (Swift.Int) -> Swift.Int) -> ()
 $s12create_pa_f2Tw_ ---> (0) thunk for non-constant partial apply in create_pa_f2
 $s12create_pa_f2Tw0_ ---> (1) thunk for non-constant partial apply in create_pa_f2
+$s5Actor02MyA0C17testAsyncFunctionyyYKFTY0_ ---> (1) suspend resume partial function for Actor.MyActor.testAsyncFunction() async throws -> ()
+$s5Actor02MyA0C17testAsyncFunctionyyYKFTQ1_ ---> (2) await resume partial function for Actor.MyActor.testAsyncFunction() async throws -> ()