mirror of
https://github.com/apple/swift.git
synced 2026-06-27 12:25:55 +02:00
John McCall
e249fd680e
Similarly to how we've always handled parameter types, we now recursively expand tuples in result types and separately determine a result convention for each result. The most important code-generation change here is that indirect results are now returned separately from each other and from any direct results. It is generally far better, when receiving an indirect result, to receive it as an independent result; the caller is much more likely to be able to directly receive the result in the address they want to initialize, rather than having to receive it in temporary memory and then copy parts of it into the target. The most important conceptual change here that clients and producers of SIL must be aware of is the new distinction between a SILFunctionType's *parameters* and its *argument list*. The former is just the formal parameters, derived purely from the parameter types of the original function; indirect results are no longer in this list. The latter includes the indirect result arguments; as always, all the indirect results strictly precede the parameters. Apply instructions and entry block arguments follow the argument list, not the parameter list. A relatively minor change is that there can now be multiple direct results, each with its own result convention. This is a minor change because I've chosen to leave return instructions as taking a single operand and apply instructions as producing a single result; when the type describes multiple results, they are implicitly bound up in a tuple. It might make sense to split these up and allow e.g. return instructions to take a list of operands; however, it's not clear what to do on the caller side, and this would be a major change that can be separated out from this already over-large patch. Unsurprisingly, the most invasive changes here are in SILGen; this requires substantial reworking of both call emission and reabstraction. It also proved important to switch several SILGen operations over to work with RValue instead of ManagedValue, since otherwise they would be forced to spuriously "implode" buffers.
112 lines
5.6 KiB
Swift
112 lines
5.6 KiB
Swift
// RUN: %target-swift-frontend -sdk %S/Inputs %s -I %S/Inputs -enable-source-import -emit-silgen -verify | FileCheck %s
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import Foundation
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// REQUIRES: objc_interop
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// ==== Metatype to object conversions
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc20convMetatypeToObjectFFCSo8NSObjectMS0_T_
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func convMetatypeToObject(f: NSObject -> NSObject.Type) {
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// CHECK: function_ref @_TTRXFo_oCSo8NSObject_dXMTS__XFo_oS__oPs9AnyObject__
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// CHECK: partial_apply
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let _: NSObject -> AnyObject = f
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}
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// CHECK-LABEL: sil shared [transparent] [reabstraction_thunk] @_TTRXFo_oCSo8NSObject_dXMTS__XFo_oS__oPs9AnyObject__ : $@convention(thin) (@owned NSObject, @owned @callee_owned (@owned NSObject) -> @thick NSObject.Type) -> @owned AnyObject {
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// CHECK: apply %1(%0)
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// CHECK: thick_to_objc_metatype {{.*}} : $@thick NSObject.Type to $@objc_metatype NSObject.Type
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// CHECK: objc_metatype_to_object {{.*}} : $@objc_metatype NSObject.Type to $AnyObject
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// CHECK: return
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@objc protocol NSBurrito {}
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc31convExistentialMetatypeToObjectFFPS_9NSBurrito_PMPS0__T_
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func convExistentialMetatypeToObject(f: NSBurrito -> NSBurrito.Type) {
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// CHECK: function_ref @_TTRXFo_oP24function_conversion_objc9NSBurrito__dXPMTPS0___XFo_oPS0___oPs9AnyObject__
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// CHECK: partial_apply
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let _: NSBurrito -> AnyObject = f
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}
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// CHECK-LABEL: sil shared [transparent] [reabstraction_thunk] @_TTRXFo_oP24function_conversion_objc9NSBurrito__dXPMTPS0___XFo_oPS0___oPs9AnyObject__ : $@convention(thin) (@owned NSBurrito, @owned @callee_owned (@owned NSBurrito) -> @thick NSBurrito.Type) -> @owned AnyObject
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// CHECK: apply %1(%0)
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// CHECK: thick_to_objc_metatype {{.*}} : $@thick NSBurrito.Type to $@objc_metatype NSBurrito.Type
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// CHECK: objc_existential_metatype_to_object {{.*}} : $@objc_metatype NSBurrito.Type to $AnyObject
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// CHECK: return
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc28convProtocolMetatypeToObjectFFT_MPS_9NSBurrito_T_
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func convProtocolMetatypeToObject(f: () -> NSBurrito.Protocol) {
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// CHECK: function_ref @_TTRXFo__dXMtP24function_conversion_objc9NSBurrito__XFo__oCSo8Protocol_
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// CHECK: partial_apply
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let _: () -> Protocol = f
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}
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// CHECK-LABEL: sil shared [transparent] [reabstraction_thunk] @_TTRXFo__dXMtP24function_conversion_objc9NSBurrito__XFo__oCSo8Protocol_ : $@convention(thin) (@owned @callee_owned () -> @thin NSBurrito.Protocol) -> @owned Protocol
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// CHECK: apply %0() : $@callee_owned () -> @thin NSBurrito.Protocol
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// CHECK: objc_protocol #NSBurrito : $Protocol
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// CHECK: strong_retain
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// CHECK: return
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// ==== Representation conversions
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc11funcToBlockFFT_T_bT_T_ : $@convention(thin) (@owned @callee_owned () -> ()) -> @owned @convention(block) () -> ()
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// CHECK: [[BLOCK_STORAGE:%.*]] = alloc_stack $@block_storage
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// CHECK: [[BLOCK:%.*]] = init_block_storage_header [[BLOCK_STORAGE]]
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// CHECK: [[COPY:%.*]] = copy_block [[BLOCK]] : $@convention(block) () -> ()
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// CHECK: return [[COPY]]
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func funcToBlock(x: () -> ()) -> @convention(block) () -> () {
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return x
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}
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc11blockToFuncFbT_T_FT_T_ : $@convention(thin) (@owned @convention(block) () -> ()) -> @owned @callee_owned () -> ()
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// CHECK: [[COPIED:%.*]] = copy_block %0
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// CHECK: [[THUNK:%.*]] = function_ref @_TTRXFdCb___XFo___
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// CHECK: [[FUNC:%.*]] = partial_apply [[THUNK]]([[COPIED]])
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// CHECK: return [[FUNC]]
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func blockToFunc(x: @convention(block) () -> ()) -> () -> () {
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return x
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}
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// ==== Representation change + function type conversion
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc22blockToFuncExistentialFbT_SiFT_P_ : $@convention(thin) (@owned @convention(block) () -> Int) -> @owned @callee_owned () -> @out protocol<>
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// CHECK: function_ref @_TTRXFdCb__dSi_XFo__dSi_
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// CHECK: partial_apply
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// CHECK: function_ref @_TTRXFo__dSi_XFo__iP__
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// CHECK: partial_apply
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// CHECK: return
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func blockToFuncExistential(x: @convention(block) () -> Int) -> () -> Any {
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return x
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}
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// CHECK-LABEL: sil shared [transparent] [reabstraction_thunk] @_TTRXFdCb__dSi_XFo__dSi_ : $@convention(thin) (@owned @convention(block) () -> Int) -> Int
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// CHECK-LABEL: sil shared [transparent] [reabstraction_thunk] @_TTRXFo__dSi_XFo__iP__ : $@convention(thin) (@owned @callee_owned () -> Int) -> @out protocol<>
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// C function pointer conversions
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class A : NSObject {}
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class B : A {}
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc18cFuncPtrConversionFcCS_1AT_cCS_1BT_
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func cFuncPtrConversion(x: @convention(c) A -> ()) -> @convention(c) B -> () {
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// CHECK: convert_function %0 : $@convention(c) (A) -> () to $@convention(c) (B) -> ()
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// CHECK: return
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return x
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}
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func cFuncPtr(a: A) {}
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// CHECK-LABEL: sil hidden @_TF24function_conversion_objc19cFuncDeclConversionFT_cCS_1BT_
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func cFuncDeclConversion() -> @convention(c) B -> () {
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// CHECK: function_ref @_TToF24function_conversion_objc8cFuncPtrFCS_1AT_ : $@convention(c) (A) -> ()
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// CHECK: convert_function %0 : $@convention(c) (A) -> () to $@convention(c) (B) -> ()
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// CHECK: return
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return cFuncPtr
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}
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func cFuncPtrConversionUnsupported(x: @convention(c) (@convention(block) () -> ()) -> ())
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-> @convention(c) (@convention(c) () -> ()) -> () {
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return x // expected-error{{C function pointer signature '@convention(c) (@convention(block) () -> ()) -> ()' is not compatible with expected type '@convention(c) (@convention(c) () -> ()) -> ()'}}
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}
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