[Async CC] Test: Mark functions that call async functions async.

lib/IRGen/GenCall.cpp

@@ -1747,6 +1747,8 @@ llvm::Value *irgen::getDynamicAsyncContextSize(IRGenFunction &IGF,
                                                AsyncContextLayout layout,
                                                CanSILFunctionType functionType,
                                                llvm::Value *thickContext) {
+  // TODO: This calculation should be extracted out into a standalone function
+  //       emitted on-demand per-module to improve codesize.
   switch (functionType->getRepresentation()) {
   case SILFunctionTypeRepresentation::Thick: {
     // If the called function is thick, the size of the called function's
@@ -2061,11 +2063,15 @@ class AsyncCallEmission final : public CallEmission {
   Size contextSize;
   Address context;
   llvm::Value *thickContext = nullptr;
+  Optional<AsyncContextLayout> asyncContextLayout;
 
   AsyncContextLayout getAsyncContextLayout() {
-    return ::getAsyncContextLayout(IGF, getCallee().getOrigFunctionType(),
-                                   getCallee().getSubstFunctionType(),
-                                   getCallee().getSubstitutions());
+    if (!asyncContextLayout) {
+      asyncContextLayout.emplace(::getAsyncContextLayout(
+          IGF, getCallee().getOrigFunctionType(),
+          getCallee().getSubstFunctionType(), getCallee().getSubstitutions()));
+    }
+    return *asyncContextLayout;
   }
 
   void saveValue(ElementLayout layout, Explosion &explosion, bool isOutlined) {

lib/IRGen/GenProto.cpp

@@ -2688,21 +2688,21 @@ void irgen::emitPolymorphicParametersFromArray(IRGenFunction &IGF,
 
 Size NecessaryBindings::getBufferSize(IRGenModule &IGM) const {
   // We need one pointer for each archetype or witness table.
-  return IGM.getPointerSize() * Requirements.size();
+  return IGM.getPointerSize() * size();
 }
 
 void NecessaryBindings::restore(IRGenFunction &IGF, Address buffer,
                                 MetadataState metadataState) const {
-  bindFromGenericRequirementsBuffer(IGF, Requirements.getArrayRef(), buffer,
+  bindFromGenericRequirementsBuffer(IGF, getRequirements(), buffer,
                                     metadataState,
-                                    [&](CanType type) { return type;});
+                                    [&](CanType type) { return type; });
 }
 
 template <typename Transform>
 static void save(const NecessaryBindings &bindings, IRGenFunction &IGF,
                  Address buffer, Transform transform) {
   emitInitOfGenericRequirementsBuffer(
-      IGF, bindings.getRequirements().getArrayRef(), buffer,
+      IGF, bindings.getRequirements(), buffer,
       [&](GenericRequirement requirement) -> llvm::Value * {
         CanType type = requirement.TypeParameter;
         if (auto protocol = requirement.Protocol) {
@@ -2770,14 +2770,13 @@ void NecessaryBindings::addTypeMetadata(CanType type) {
   // Generic types are trickier, because they can require conformances.
 
   // Otherwise, just record the need for this metadata.
-  Requirements.insert({type, nullptr});
+  addRequirement({type, nullptr});
 }
 
 /// Add all the abstract conditional conformances in the specialized
 /// conformance to the \p requirements.
-static void addAbstractConditionalRequirements(
-    SpecializedProtocolConformance *specializedConformance,
-    llvm::SetVector<GenericRequirement> &requirements) {
+void NecessaryBindings::addAbstractConditionalRequirements(
+    SpecializedProtocolConformance *specializedConformance) {
   auto subMap = specializedConformance->getSubstitutionMap();
   auto condRequirements = specializedConformance->getConditionalRequirements();
   for (auto req : condRequirements) {
@@ -2789,7 +2788,7 @@ static void addAbstractConditionalRequirements(
     auto archetype = dyn_cast<ArchetypeType>(ty);
     if (!archetype)
       continue;
-    requirements.insert({ty, proto});
+    addRequirement({ty, proto});
   }
   // Recursively add conditional requirements.
   for (auto &conf : subMap.getConformances()) {
@@ -2799,7 +2798,7 @@ static void addAbstractConditionalRequirements(
         dyn_cast<SpecializedProtocolConformance>(conf.getConcrete());
     if (!specializedConf)
       continue;
-    addAbstractConditionalRequirements(specializedConf, requirements);
+    addAbstractConditionalRequirements(specializedConf);
   }
 }
 
@@ -2811,8 +2810,8 @@ void NecessaryBindings::addProtocolConformance(CanType type,
         dyn_cast<SpecializedProtocolConformance>(concreteConformance);
     // The partial apply forwarder does not have the context to reconstruct
     // abstract conditional conformance requirements.
-    if (forPartialApply && specializedConf) {
-      addAbstractConditionalRequirements(specializedConf, Requirements);
+    if (forPartialApply() && specializedConf) {
+      addAbstractConditionalRequirements(specializedConf);
     } else if (forAsyncFunction()) {
       ProtocolDecl *protocol = conf.getRequirement();
       GenericRequirement requirement;
@@ -2821,15 +2820,15 @@ void NecessaryBindings::addProtocolConformance(CanType type,
       std::pair<GenericRequirement, ProtocolConformanceRef> pair{requirement,
                                                                  conf};
       Conformances.insert(pair);
-      Requirements.insert({type, concreteConformance->getProtocol()});
+      addRequirement({type, concreteConformance->getProtocol()});
     }
     return;
   }
   assert(isa<ArchetypeType>(type) || forAsyncFunction());
 
   // TODO: pass something about the root conformance necessary to
   // reconstruct this.
-  Requirements.insert({type, conf.getAbstract()});
+  addRequirement({type, conf.getAbstract()});
 }
 
 llvm::Value *irgen::emitWitnessTableRef(IRGenFunction &IGF,
@@ -3033,7 +3032,8 @@ NecessaryBindings NecessaryBindings::computeBindings(
     bool forPartialApplyForwarder, bool considerParameterSources) {
 
   NecessaryBindings bindings;
-  bindings.forPartialApply = forPartialApplyForwarder;
+  bindings.kind =
+      forPartialApplyForwarder ? Kind::PartialApply : Kind::AsyncFunction;
 
   // Bail out early if we don't have polymorphic parameters.
   if (!hasPolymorphicParameters(origType))

lib/IRGen/IRGenSIL.cpp

@@ -1331,7 +1331,11 @@ std::unique_ptr<COrObjCEntryPointArgumentEmission>
 getCOrObjCEntryPointArgumentEmission(IRGenSILFunction &IGF,
                                      SILBasicBlock &entry,
                                      Explosion &allParamValues) {
-  if (IGF.CurSILFn->isAsync()) {
+  if (IGF.CurSILFn->isAsync() &&
+      !(/*FIXME: Remove this condition once Task.runDetached is
+                            available.  rdar://problem/70597390*/
+        IGF.CurSILFn->getLoweredFunctionType()->getRepresentation() ==
+        SILFunctionTypeRepresentation::CFunctionPointer)) {
     llvm_unreachable("unsupported");
   } else {
     return std::make_unique<SyncCOrObjCEntryPointArgumentEmission>(
@@ -2686,7 +2690,7 @@ void IRGenSILFunction::visitFullApplySite(FullApplySite site) {
     }
   }
 
-  Explosion llArgs;    
+  Explosion llArgs;
   WitnessMetadata witnessMetadata;
   auto emission = getCallEmissionForLoweredValue(
       *this, origCalleeType, substCalleeType, calleeLV, selfValue,
@@ -3141,7 +3145,12 @@ static void emitReturnInst(IRGenSILFunction &IGF,
     auto &retTI = cast<LoadableTypeInfo>(IGF.getTypeInfo(resultTy));
     retTI.initialize(IGF, result, IGF.IndirectReturn, false);
     IGF.Builder.CreateRetVoid();
-  } else if (IGF.isAsync()) {
+  } else if (IGF.isAsync() &&
+             !(/*FIXME: Remove this condition once Task.runDetached is
+                  available.  rdar://problem/70597390*/
+               IGF.CurSILFn->getLoweredFunctionType()
+                   ->getRepresentation() ==
+               SILFunctionTypeRepresentation::CFunctionPointer)) {
     // If we're generating an async function, store the result into the buffer.
     assert(!IGF.IndirectReturn.isValid() &&
            "Formally direct results should stay direct results for async "

lib/IRGen/NecessaryBindings.h

@@ -25,31 +25,49 @@
 #include "llvm/ADT/SetVector.h"
 #include "swift/AST/Types.h"
 
-#include "Explosion.h"
-
 namespace swift {
   class CanType;
   enum class MetadataState : size_t;
   class ProtocolDecl;
   class ProtocolConformanceRef;
+  class SpecializedProtocolConformance;
 
-namespace irgen {
+  namespace irgen {
   class Address;
+  class Explosion;
   class IRGenFunction;
   class IRGenModule;
   class Size;
 
 /// NecessaryBindings - The set of metadata that must be saved in
 /// order to perform some set of operations on a type.
 class NecessaryBindings {
-  llvm::SetVector<GenericRequirement> Requirements;
+  enum class Kind {
+    /// Are the bindings to be computed for a partial apply forwarder.
+    /// In the case this is true we need to store/restore the conformance of a
+    /// specialized type with conditional conformance because the conditional
+    /// requirements are not available in the partial apply forwarder.
+    PartialApply,
+    AsyncFunction,
+  };
+  Kind kind;
+  llvm::SetVector<GenericRequirement> RequirementsSet;
+  llvm::SmallVector<GenericRequirement, 2> RequirementsVector;
   llvm::DenseMap<GenericRequirement, ProtocolConformanceRef> Conformances;
 
-  /// Are the bindings to be computed for a partial apply forwarder.
-  /// In the case this is true we need to store/restore the conformance of a
-  /// specialized type with conditional conformance because the conditional
-  /// requirements are not available in the partial apply forwarder.
-  bool forPartialApply = false;
+  void addRequirement(GenericRequirement requirement) {
+    switch (kind) {
+    case Kind::PartialApply:
+      RequirementsSet.insert(requirement);
+      break;
+    case Kind::AsyncFunction:
+      RequirementsVector.push_back(requirement);
+      break;
+    }
+  }
+
+  void addAbstractConditionalRequirements(
+      SpecializedProtocolConformance *specializedConformance);
 
 public:
   NecessaryBindings() = default;
@@ -70,24 +88,27 @@ class NecessaryBindings {
 
   /// Get the requirement from the bindings at index i.
   const GenericRequirement &operator[](size_t i) const {
-    return Requirements[i];
+    switch (kind) {
+    case Kind::PartialApply:
+      return RequirementsSet[i];
+    case Kind::AsyncFunction:
+      return RequirementsVector[i];
+    }
   }
 
   ProtocolConformanceRef
   getConformance(const GenericRequirement &requirement) const {
     return Conformances.lookup(requirement);
   }
 
-  size_t size() const {
-    return Requirements.size();
-  }
+  size_t size() const { return getRequirements().size(); }
 
   /// Add whatever information is necessary to reconstruct a witness table
   /// reference for the given type.
   void addProtocolConformance(CanType type, ProtocolConformanceRef conf);
 
   /// Is the work to do trivial?
-  bool empty() const { return Requirements.empty(); }
+  bool empty() const { return getRequirements().empty(); }
 
   /// Returns the required size of the bindings.
   /// Pointer alignment is sufficient.
@@ -101,11 +122,17 @@ class NecessaryBindings {
   /// Restore the necessary bindings from the given buffer.
   void restore(IRGenFunction &IGF, Address buffer, MetadataState state) const;
 
-  const llvm::SetVector<GenericRequirement> &getRequirements() const {
-    return Requirements;
+  const llvm::ArrayRef<GenericRequirement> getRequirements() const {
+    switch (kind) {
+    case Kind::PartialApply:
+      return RequirementsSet.getArrayRef();
+    case Kind::AsyncFunction:
+      return RequirementsVector;
+    }
   }
 
-  bool forAsyncFunction() { return !forPartialApply; }
+  bool forPartialApply() { return kind == Kind::PartialApply; }
+  bool forAsyncFunction() { return kind == Kind::AsyncFunction; }
 
 private:
   static NecessaryBindings computeBindings(IRGenModule &IGM,

test/IRGen/async/partial_apply.sil

@@ -372,25 +372,25 @@ bb0(%0 : $*A2<A3>):
   return %5 : $@async @callee_guaranteed () -> (@owned A1, @error Error)
 }
 
-sil @capture_class : $@async @convention(thin) (@guaranteed A3) -> ()
-
-// CHECK-LABEL: define{{.*}} swiftcc i8* @partial_apply_stack_in_coroutine(i8* {{.*}} %0, %T13partial_apply2A3C* %1)
-sil @partial_apply_stack_in_coroutine : $@yield_once (@owned A3) -> () {
-entry(%0: $A3):
-  %f = function_ref @capture_class : $@async @convention(thin) (@guaranteed A3) -> ()
-  %p = partial_apply [callee_guaranteed] [on_stack] %f(%0) : $@async @convention(thin) (@guaranteed A3) -> ()
-  apply %p() : $@noescape @async @callee_guaranteed () -> ()
-  dealloc_stack %p : $@noescape @async @callee_guaranteed () -> ()
-  %1000 = integer_literal $Builtin.Int32, 1000
-  yield (), resume resume, unwind unwind
-
-resume:
-  %ret = tuple ()
-  return %ret : $()
-
-unwind:
-  unwind
-}
+//sil @capture_class : $@async @convention(thin) (@guaranteed A3) -> ()
+//
+//// CHECK LABEL: define{{.*}} swiftcc i8* @partial_apply_stack_in_coroutine(i8* {{.*}} %0, %T13partial_apply2A3C* %1)
+//sil @partial_apply_stack_in_coroutine : $@async @yield_once (@owned A3) -> () {
+//entry(%0: $A3):
+//  %f = function_ref @capture_class : $@async @convention(thin) (@guaranteed A3) -> ()
+//  %p = partial_apply [callee_guaranteed] [on_stack] %f(%0) : $@async @convention(thin) (@guaranteed A3) -> ()
+//  apply %p() : $@noescape @async @callee_guaranteed () -> ()
+//  dealloc_stack %p : $@noescape @async @callee_guaranteed () -> ()
+//  %1000 = integer_literal $Builtin.Int32, 1000
+//  yield (), resume resume, unwind unwind
+//
+//resume:
+//  %ret = tuple ()
+//  return %ret : $()
+//
+//unwind:
+//  unwind
+//}
 sil_vtable A3 {}
 
 

test/IRGen/async/run-call-classinstance-int64-to-void.sil

@@ -30,12 +30,12 @@ class S {
 // CHECK-LL: define hidden swiftcc void @classinstanceSInt64ToVoid(%swift.context* {{%[0-9]*}}) {{#[0-9]*}} {
 sil hidden @classinstanceSInt64ToVoid : $@async @convention(method) (Int64, @guaranteed S) -> () {
 bb0(%int : $Int64, %instance : $S):
-  %take_s = function_ref @take_S : $@convention(thin) (@guaranteed S) -> ()
-  %result = apply %take_s(%instance) : $@convention(thin) (@guaranteed S) -> ()
+  %take_s = function_ref @take_S : $@async @convention(thin) (@guaranteed S) -> ()
+  %result = apply %take_s(%instance) : $@async @convention(thin) (@guaranteed S) -> ()
   return %result : $()
 }
 
-sil hidden @take_S : $@convention(thin) (@guaranteed S) -> () {
+sil hidden @take_S : $@async @convention(thin) (@guaranteed S) -> () {
 bb0(%instance : $S):
   %any = alloc_stack $Any
   strong_retain %instance : $S
@@ -83,7 +83,7 @@ sil_vtable S {
   #S.deinit!deallocator: @S_deallocating_deinit
 }
 
-sil @main : $@convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
+sil @main : $@async @convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
 bb0(%0 : $Int32, %1 : $UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>):
 
   %s_type = metatype $@thick S.Type

test/IRGen/async/run-call-classinstance-void-to-void.sil

@@ -30,12 +30,12 @@ class S {
 // CHECK-LL: define hidden swiftcc void @classinstanceSVoidToVoid(%swift.context* {{%[0-9]*}}) {{#[0-9]*}} {
 sil hidden @classinstanceSVoidToVoid : $@async @convention(method) (@guaranteed S) -> () {
 bb0(%instance : $S):
-  %take_s = function_ref @take_S : $@convention(thin) (@guaranteed S) -> ()
-  %result = apply %take_s(%instance) : $@convention(thin) (@guaranteed S) -> ()
+  %take_s = function_ref @take_S : $@async @convention(thin) (@guaranteed S) -> ()
+  %result = apply %take_s(%instance) : $@async @convention(thin) (@guaranteed S) -> ()
   return %result : $()
 }
 
-sil hidden @take_S : $@convention(thin) (@guaranteed S) -> () {
+sil hidden @take_S : $@async @convention(thin) (@guaranteed S) -> () {
 bb0(%instance : $S):
   %any = alloc_stack $Any
   strong_retain %instance : $S
@@ -83,7 +83,7 @@ sil_vtable S {
   #S.deinit!deallocator: @S_deallocating_deinit
 }
 
-sil @main : $@convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
+sil @main : $@async @convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
 bb0(%0 : $Int32, %1 : $UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>):
 
   %s_type = metatype $@thick S.Type

test/IRGen/async/run-call-existential-to-void.sil

@@ -49,7 +49,7 @@ bb0(%existential : $*P):
   return %result : $()
 }
 
-sil hidden @call : $@convention(thin) () -> () {
+sil hidden @call : $@async @convention(thin) () -> () {
 bb0:
   %S_type = metatype $@thin S.Type
   %int_literal = integer_literal $Builtin.Int64, 7384783
@@ -66,10 +66,10 @@ bb0:
   return %result : $()
 }
 
-sil @main : $@convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
+sil @main : $@async @convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
 bb0(%0 : $Int32, %1 : $UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>):
-  %call = function_ref @call : $@convention(thin) () -> () // CHECK: 7384783
-  %result = apply %call() : $@convention(thin) () -> ()
+  %call = function_ref @call : $@async @convention(thin) () -> () // CHECK: 7384783
+  %result = apply %call() : $@async @convention(thin) () -> ()
 
   %2 = integer_literal $Builtin.Int32, 0
   %3 = struct $Int32 (%2 : $Builtin.Int32)