Merge pull request swiftlang#80708 from atrick/irgen-addressable

atrick · web-flow · commit 21480b802184 · 2025-04-10T14:22:01.000-07:00
Fix IRGen for @_addressable params which may be "captured".
diff --git a/include/swift/AST/Types.h b/include/swift/AST/Types.h
@@ -5452,6 +5452,10 @@ class SILFunctionType final
     return getParameters().back();
   }
 
+  unsigned getSelfParameterIndex() const {
+    return NumParameters - 1;
+  }
+
   /// Return SILParameterInfo for the isolated parameter in this SILFunctionType
   /// if one exists. Returns None otherwise.
   std::optional<SILParameterInfo> maybeGetIsolatedParameter() const {
@@ -5656,6 +5660,17 @@ class SILFunctionType final
   /// Defined in SILType.cpp.
   bool isAddressable(unsigned paramIdx, SILFunction *caller);
 
+  /// Return true of the specified parameter is addressable based on its type
+  /// lowering. This includes @_addressableForDependencies parameter types.
+  ///
+  /// 'genericEnv' may be null.
+  ///
+  /// Defined in SILType.cpp.
+  bool isAddressable(unsigned paramIdx, SILModule &module,
+                     GenericEnvironment *genericEnv,
+                     Lowering::TypeConverter &typeConverter,
+                     TypeExpansionContext expansion);
+
   /// Returns true if the function type stores a Clang type that cannot
   /// be derived from its Swift type. Returns false otherwise, including if
   /// the function type is not @convention(c) or @convention(block).
diff --git a/lib/IRGen/GenCall.cpp b/lib/IRGen/GenCall.cpp
@@ -305,13 +305,14 @@ static void addDereferenceableAttributeToBuilder(IRGenModule &IGM,
 static void addIndirectValueParameterAttributes(IRGenModule &IGM,
                                                 llvm::AttributeList &attrs,
                                                 const TypeInfo &ti,
-                                                unsigned argIndex) {
+                                                unsigned argIndex,
+                                                bool addressable) {
   llvm::AttrBuilder b(IGM.getLLVMContext());
   // Value parameter pointers can't alias or be captured.
   b.addAttribute(llvm::Attribute::NoAlias);
   // Bitwise takable value types are guaranteed not to capture
   // a pointer into itself.
-  if (ti.isBitwiseTakable(ResilienceExpansion::Maximal))
+  if (!addressable && ti.isBitwiseTakable(ResilienceExpansion::Maximal))
     b.addAttribute(llvm::Attribute::NoCapture);
   // The parameter must reference dereferenceable memory of the type.
   addDereferenceableAttributeToBuilder(IGM, b, ti);
@@ -340,7 +341,7 @@ static void addPackParameterAttributes(IRGenModule &IGM,
 static void addInoutParameterAttributes(IRGenModule &IGM, SILType paramSILType,
                                         llvm::AttributeList &attrs,
                                         const TypeInfo &ti, unsigned argIndex,
-                                        bool aliasable) {
+                                        bool aliasable, bool addressable) {
   llvm::AttrBuilder b(IGM.getLLVMContext());
   // Thanks to exclusivity checking, it is not possible to alias inouts except
   // those that are inout_aliasable.
@@ -351,7 +352,7 @@ static void addInoutParameterAttributes(IRGenModule &IGM, SILType paramSILType,
   }
   // Bitwise takable value types are guaranteed not to capture
   // a pointer into itself.
-  if (ti.isBitwiseTakable(ResilienceExpansion::Maximal))
+  if (!addressable && ti.isBitwiseTakable(ResilienceExpansion::Maximal))
     b.addAttribute(llvm::Attribute::NoCapture);
   // The inout must reference dereferenceable memory of the type.
   addDereferenceableAttributeToBuilder(IGM, b, ti);
@@ -600,9 +601,11 @@ namespace {
     Signature getSignature();
 
   private:
-    const TypeInfo &expand(SILParameterInfo param);
+    const TypeInfo &expand(unsigned paramIdx);
     llvm::Type *addIndirectResult(SILType resultType, bool useInReg = false);
 
+    bool isAddressableParam(unsigned paramIdx);
+
     SILFunctionConventions getSILFuncConventions() const {
       return SILFunctionConventions(FnType, IGM.getSILModule());
     }
@@ -1781,24 +1784,27 @@ static ArrayRef<llvm::Type *> expandScalarOrStructTypeToArray(llvm::Type *&ty) {
   return expandedTys;
 }
 
-const TypeInfo &SignatureExpansion::expand(SILParameterInfo param) {
+const TypeInfo &SignatureExpansion::expand(unsigned paramIdx) {
+  auto param = FnType->getParameters()[paramIdx];
   auto paramSILType = getSILFuncConventions().getSILType(
       param, IGM.getMaximalTypeExpansionContext());
   auto &ti = IGM.getTypeInfo(paramSILType);
   switch (auto conv = param.getConvention()) {
   case ParameterConvention::Indirect_In:
   case ParameterConvention::Indirect_In_Guaranteed:
   case ParameterConvention::Indirect_In_CXX:
-    addIndirectValueParameterAttributes(IGM, Attrs, ti, ParamIRTypes.size());
+    addIndirectValueParameterAttributes(IGM, Attrs, ti, ParamIRTypes.size(),
+                                        isAddressableParam(paramIdx));
     addPointerParameter(IGM.getStorageType(getSILFuncConventions().getSILType(
         param, IGM.getMaximalTypeExpansionContext())));
     return ti;
 
   case ParameterConvention::Indirect_Inout:
   case ParameterConvention::Indirect_InoutAliasable:
     addInoutParameterAttributes(
-        IGM, paramSILType, Attrs, ti, ParamIRTypes.size(),
-        conv == ParameterConvention::Indirect_InoutAliasable);
+      IGM, paramSILType, Attrs, ti, ParamIRTypes.size(),
+      conv == ParameterConvention::Indirect_InoutAliasable,
+      isAddressableParam(paramIdx));
     addPointerParameter(IGM.getStorageType(getSILFuncConventions().getSILType(
         param, IGM.getMaximalTypeExpansionContext())));
     return ti;
@@ -1822,7 +1828,8 @@ const TypeInfo &SignatureExpansion::expand(SILParameterInfo param) {
       auto &nativeSchema = ti.nativeParameterValueSchema(IGM);
       if (nativeSchema.requiresIndirect()) {
         addIndirectValueParameterAttributes(IGM, Attrs, ti,
-                                            ParamIRTypes.size());
+                                            ParamIRTypes.size(),
+                                            /*addressable*/ false);
         ParamIRTypes.push_back(ti.getStorageType()->getPointerTo());
         return ti;
       }
@@ -1842,6 +1849,13 @@ const TypeInfo &SignatureExpansion::expand(SILParameterInfo param) {
   llvm_unreachable("bad parameter convention");
 }
 
+bool SignatureExpansion::isAddressableParam(unsigned paramIdx) {
+  return FnType->isAddressable(paramIdx, IGM.IRGen.SIL,
+                               IGM.getGenericEnvironment(),
+                               IGM.getSILTypes(),
+                               IGM.getMaximalTypeExpansionContext());
+}
+
 /// Does the given function type have a self parameter that should be
 /// given the special treatment for self parameters?
 ///
@@ -1887,7 +1901,6 @@ static void addParamInfo(SignatureExpansionABIDetails *details,
 }
 
 void SignatureExpansion::expandKeyPathAccessorParameters() {
-  auto params = FnType->getParameters();
   unsigned numArgsToExpand;
   SmallVector<llvm::Type *, 4> tailParams;
 
@@ -1933,7 +1946,7 @@ void SignatureExpansion::expandKeyPathAccessorParameters() {
     llvm_unreachable("non keypath accessor convention");
   }
   for (unsigned i = 0; i < numArgsToExpand; i++) {
-    expand(params[i]);
+    expand(i);
   }
   for (auto tailParam : tailParams) {
     ParamIRTypes.push_back(tailParam);
@@ -1987,9 +2000,9 @@ void SignatureExpansion::expandParameters(
     params = params.drop_back();
   }
 
-  for (auto param : params) {
-    const TypeInfo &ti = expand(param);
-    addParamInfo(recordedABIDetails, ti, param.getConvention());
+  for (auto pair : enumerate(params)) {
+    const TypeInfo &ti = expand(pair.index());
+    addParamInfo(recordedABIDetails, ti, pair.value().getConvention());
   }
   if (recordedABIDetails && FnType->hasSelfParam() && !hasSelfContext)
     recordedABIDetails->parameters.back().isSelf = true;
@@ -2015,7 +2028,7 @@ void SignatureExpansion::expandParameters(
 
     if (claimSelf())
       IGM.addSwiftSelfAttributes(Attrs, curLength);
-    expand(FnType->getSelfParameter());
+    expand(FnType->getSelfParameterIndex());
     if (recordedABIDetails)
       recordedABIDetails->hasTrailingSelfParam = true;
     assert(ParamIRTypes.size() == curLength + 1 &&
@@ -2260,8 +2273,8 @@ void SignatureExpansion::expandAsyncEntryType() {
     params = params.drop_back();
   }
 
-  for (auto param : params) {
-    expand(param);
+  for (unsigned i : range(params.size())) {
+    expand(i);
   }
 
   // Next, the generic signature.
@@ -2279,7 +2292,7 @@ void SignatureExpansion::expandAsyncEntryType() {
   if (hasSelfContext) {
     auto curLength = ParamIRTypes.size();
     (void)curLength;
-    expand(FnType->getSelfParameter());
+    expand(FnType->getSelfParameterIndex());
     assert(ParamIRTypes.size() == curLength + 1 &&
            "adding 'self' added unexpected number of parameters");
     if (claimSelf())
diff --git a/lib/SIL/IR/SILType.cpp b/lib/SIL/IR/SILType.cpp
@@ -707,6 +707,17 @@ bool SILFunctionType::isNoReturnFunction(SILModule &M,
 }
 
 bool SILFunctionType::isAddressable(unsigned paramIdx, SILFunction *caller) {
+  return isAddressable(paramIdx, caller->getModule(),
+                       caller->getGenericEnvironment(),
+                       caller->getModule().Types,
+                       caller->getTypeExpansionContext());
+}
+
+// 'genericEnv' may be null.
+bool SILFunctionType::isAddressable(unsigned paramIdx, SILModule &module,
+                                    GenericEnvironment *genericEnv,
+                                    Lowering::TypeConverter &typeConverter,
+                                    TypeExpansionContext expansion) {
   SILParameterInfo paramInfo = getParameters()[paramIdx];
   for (auto &depInfo : getLifetimeDependencies()) {
     auto *addressableIndices = depInfo.getAddressableIndices();
@@ -715,13 +726,12 @@ bool SILFunctionType::isAddressable(unsigned paramIdx, SILFunction *caller) {
     }
     auto *condAddressableIndices = depInfo.getConditionallyAddressableIndices();
     if (condAddressableIndices && condAddressableIndices->contains(paramIdx)) {
-      CanType argType = paramInfo.getArgumentType(
-        caller->getModule(), this, caller->getTypeExpansionContext());
-      CanType contextType =
-        argType->hasTypeParameter()
-        ? caller->mapTypeIntoContext(argType)->getCanonicalType()
+      CanType argType = paramInfo.getArgumentType(module, this, expansion);
+      CanType contextType = genericEnv
+        ? genericEnv->mapTypeIntoContext(argType)->getCanonicalType()
         : argType;
-      auto &tl = caller->getTypeLowering(contextType);
+      assert(!contextType->hasTypeParameter());
+      auto &tl = typeConverter.getTypeLowering(contextType, expansion);
       if (tl.getRecursiveProperties().isAddressableForDependencies())
         return true;
     }
diff --git a/test/IRGen/addressable.swift b/test/IRGen/addressable.swift
@@ -0,0 +1,34 @@
+// RUN: %target-swift-frontend -module-name A -emit-ir -primary-file %s \
+// RUN: -enable-experimental-feature LifetimeDependence \
+// RUN: -enable-experimental-feature AddressableTypes \
+// RUN: | %FileCheck %s
+
+// REQUIRES: swift_feature_AddressableTypes
+// REQUIRES: swift_feature_LifetimeDependence
+
+public struct NE: ~Escapable {}
+
+@_addressableForDependencies
+public struct Holder {}
+
+@_silgen_name("holder_NE")
+@lifetime(borrow holder)
+func getNE(_ holder: Holder) -> NE
+
+@_silgen_name("holder_mut_NE")
+@lifetime(&holder)
+func getMutNE(_ holder: inout Holder) -> NE
+
+// The parameter cannot be 'nocapture'.
+//
+// CHECK-LABEL: define{{.*}} swiftcc void @"$s1A17testAddressableInyAA2NEVAA6HolderVF"(ptr noalias %0)
+public func testAddressableIn(_ holder: Holder) -> NE {
+  getNE(holder)
+}
+
+// The parameter cannot be 'nocapture'.
+//
+// CHECK-LABEL: define{{.*}} swiftcc void @"$s1A20testAddressableInoutyAA2NEVAA6HolderVzF"(ptr %0)
+public func testAddressableInout(_ holder: inout Holder) -> NE {
+  getMutNE(&holder)
+}
