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09d0cfee8d
Now we can discern the types of values in heap boxes at runtime! Closure reference captures are a common way of creating reference cycles, so this provides some basic infrastructure for detecting those someday. A closure capture descriptor has the following: - The number of captures. - The number of sources of metadata reachable from the closure. This is important for substituting generics at runtime since we can't know precisely what will get captured until we observe a closure. - The number of types in the NecessaryBindings structure. This is a holding tank in a closure for sources of metadata that can't be gotten from the captured values themselves. - The metadata source map, a list of pairs, for each source of metadata for every generic argument needed to perform substitution at runtime. Key: The typeref for the generic parameter visible from the closure in the Swift source. Value: The metadata source, which describes how to crawl the heap from the closure to get to the metadata for that generic argument. - A list of typerefs for the captured values themselves. Follow-up: IRGen tests for various capture scenarios, which will include MetadataSource encoding tests. rdar://problem/24989531
197 lines
8.3 KiB
C++
197 lines
8.3 KiB
C++
//===--- GenObjC.h - Swift IR generation for Objective-C --------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the private interface to Objective-C emission code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_GENOBJC_H
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#define SWIFT_IRGEN_GENOBJC_H
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namespace llvm {
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class Type;
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class Value;
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}
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namespace swift {
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class CanType;
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class FuncDecl;
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struct SILDeclRef;
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class SILFunction;
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class SILType;
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class Substitution;
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namespace irgen {
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class CallEmission;
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class IRGenFunction;
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class IRGenModule;
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/// The kind of message to send through the Objective-C runtime.
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enum class ObjCMessageKind {
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/// A normally-dispatched call.
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Normal,
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/// A call to a superclass method.
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Super,
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/// A call to a peer method.
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Peer
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};
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CallEmission prepareObjCMethodRootCall(IRGenFunction &IGF,
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SILDeclRef method,
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CanSILFunctionType origFnType,
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CanSILFunctionType substFnType,
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ArrayRef<Substitution> subs,
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ObjCMessageKind kind);
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void addObjCMethodCallImplicitArguments(IRGenFunction &IGF,
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Explosion &emission,
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SILDeclRef method,
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llvm::Value *self,
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SILType superSearchType);
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/// Emit a partial application of an Objective-C method to its 'self'
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/// argument.
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void emitObjCPartialApplication(IRGenFunction &IGF,
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SILDeclRef method,
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CanSILFunctionType origType,
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CanSILFunctionType partialAppliedType,
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llvm::Value *self,
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SILType selfType,
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Explosion &out);
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/// Reclaim an autoreleased return value.
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llvm::Value *emitObjCRetainAutoreleasedReturnValue(IRGenFunction &IGF,
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llvm::Value *value);
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/// Autorelease a return value.
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llvm::Value *emitObjCAutoreleaseReturnValue(IRGenFunction &IGF,
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llvm::Value *value);
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/// Build the components of an Objective-C method descriptor for the given
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/// method or constructor implementation.
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void emitObjCMethodDescriptorParts(IRGenModule &IGM,
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AbstractFunctionDecl *method,
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bool extendedEncoding,
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bool concrete,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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/// Build the components of an Objective-C method descriptor for the given
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/// property's method implementations.
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void emitObjCGetterDescriptorParts(IRGenModule &IGM,
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VarDecl *property,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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/// Build the components of an Objective-C method descriptor for the given
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/// subscript's method implementations.
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void emitObjCGetterDescriptorParts(IRGenModule &IGM,
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SubscriptDecl *subscript,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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void emitObjCGetterDescriptorParts(IRGenModule &IGM,
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AbstractStorageDecl *subscript,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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/// Build the components of an Objective-C method descriptor for the given
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/// property's method implementations.
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void emitObjCSetterDescriptorParts(IRGenModule &IGM,
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VarDecl *property,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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/// Build the components of an Objective-C method descriptor for the given
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/// subscript's method implementations.
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void emitObjCSetterDescriptorParts(IRGenModule &IGM,
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SubscriptDecl *subscript,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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void emitObjCSetterDescriptorParts(IRGenModule &IGM,
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AbstractStorageDecl *subscript,
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llvm::Constant *&selectorRef,
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llvm::Constant *&atEncoding,
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llvm::Constant *&impl);
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/// Build an Objective-C method descriptor for the given method,
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/// constructor, or destructor implementation.
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llvm::Constant *emitObjCMethodDescriptor(IRGenModule &IGM,
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AbstractFunctionDecl *method);
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/// Build an Objective-C method descriptor for the ivar initializer
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/// or destroyer of a class (-.cxx_construct or -.cxx_destruct).
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///
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/// \returns the method destructor, or an empty optional if there is
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/// no corresponding SIL function.
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Optional<llvm::Constant*> emitObjCIVarInitDestroyDescriptor(IRGenModule &IGM,
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ClassDecl *cd,
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bool isDestroyer);
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/// Get the type encoding for an ObjC property.
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void getObjCEncodingForPropertyType(IRGenModule &IGM, VarDecl *property,
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std::string &s);
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/// Produces extended encoding of ObjC block signature.
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/// \returns the encoded type.
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llvm::Constant *getBlockTypeExtendedEncoding(IRGenModule &IGM,
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CanSILFunctionType invokeTy);
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/// Produces extended encoding of method type.
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/// \returns the encoded type.
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llvm::Constant *getMethodTypeExtendedEncoding(IRGenModule &IGM,
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AbstractFunctionDecl *method);
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/// Build an Objective-C method descriptor for the given property's
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/// getter and setter methods.
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std::pair<llvm::Constant *, llvm::Constant *>
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emitObjCPropertyMethodDescriptors(IRGenModule &IGM, VarDecl *property);
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/// Build an Objective-C method descriptor for the given subscript's
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/// getter and setter methods.
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std::pair<llvm::Constant *, llvm::Constant *>
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emitObjCSubscriptMethodDescriptors(IRGenModule &IGM,
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SubscriptDecl *subscript);
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/// True if the FuncDecl requires an ObjC method descriptor.
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bool requiresObjCMethodDescriptor(FuncDecl *method);
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/// True if the ConstructorDecl requires an ObjC method descriptor.
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bool requiresObjCMethodDescriptor(ConstructorDecl *constructor);
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/// True if the VarDecl requires ObjC accessor methods and a property
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/// descriptor.
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bool requiresObjCPropertyDescriptor(IRGenModule &IGM,
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VarDecl *property);
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/// True if the SubscriptDecl requires ObjC accessor methods.
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bool requiresObjCSubscriptDescriptor(IRGenModule &IGM,
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SubscriptDecl *subscript);
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/// Allocate an Objective-C object.
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llvm::Value *emitObjCAllocObjectCall(IRGenFunction &IGF,
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llvm::Value *classPtr,
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CanType resultType);
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} // end namespace irgen
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} // end namespace swift
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#endif
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