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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
66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
//===--- GenFunc.h - Swift IR generation for functions ----------*- 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 the function and
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// function-type emission code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_GENFUNC_H
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#define SWIFT_IRGEN_GENFUNC_H
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#include "swift/AST/Types.h"
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namespace llvm {
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class Function;
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class Value;
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}
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namespace swift {
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namespace irgen {
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class Address;
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class Explosion;
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class ForeignFunctionInfo;
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class IRGenFunction;
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/// Project the capture address from on-stack block storage.
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Address projectBlockStorageCapture(IRGenFunction &IGF,
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Address storageAddr,
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CanSILBlockStorageType storageTy);
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/// Emit the block header into a block storage slot.
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void emitBlockHeader(IRGenFunction &IGF,
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Address storage,
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CanSILBlockStorageType blockTy,
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llvm::Function *invokeFunction,
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CanSILFunctionType invokeTy,
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ForeignFunctionInfo foreignInfo);
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/// Emit a partial application thunk for a function pointer applied to a
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/// partial set of argument values.
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void emitFunctionPartialApplication(IRGenFunction &IGF,
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SILFunction &SILFn,
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llvm::Value *fnPtr,
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llvm::Value *fnContext,
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Explosion &args,
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ArrayRef<SILParameterInfo> argTypes,
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ArrayRef<Substitution> subs,
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CanSILFunctionType origType,
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CanSILFunctionType substType,
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CanSILFunctionType outType,
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Explosion &out);
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} // end namespace irgen
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} // end namespace swift
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#endif
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