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Erik Eckstein
080f9e6a81
Optimizes protocol conformance checking by pre-populating vtables with conformance information for "fast-cast" protocols that have superclass constraints. This optimization works by: 1. Identifying classes that are eligible for optimization (have fixed metadata layout, are not open access, and belong to the current module) 2. Finding protocols, enabled for fast casting nad that have superclass constraints and belong to the current module 3. Pre-computing conformance checks for these protocols and storing the results directly in the vtable, eliminating the need for runtime conformance lookups
99 lines
2.2 KiB
Plaintext
99 lines
2.2 KiB
Plaintext
// RUN: %target-sil-opt -wmo %s -conformance-check-optimization | %FileCheck %s
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sil_stage canonical
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import Builtin
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import Swift
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@_semantics("fast_cast")
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protocol FastCastBaseProtocol : BaseClass {}
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@_semantics("fast_cast")
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protocol FastCastIntermediateProtocol : IntermediateClass {}
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protocol SlowCastProtocol : BaseClass {}
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class BaseClass {}
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class IntermediateClass : BaseClass {}
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class ConformingClass : IntermediateClass, FastCastBaseProtocol {}
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class NonConformingClass : IntermediateClass, SlowCastProtocol {}
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class ConformingClass2 : IntermediateClass, FastCastIntermediateProtocol { }
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// CHECK-LABEL: sil_vtable BaseClass {
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// CHECK-NEXT: no_conformance FastCastBaseProtocol
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// CHECK-NEXT: }
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sil_vtable BaseClass {
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}
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// CHECK-LABEL: sil_vtable IntermediateClass {
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// CHECK-NEXT: no_conformance FastCastBaseProtocol
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// CHECK-NEXT: no_conformance FastCastIntermediateProtocol
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// CHECK-NEXT: }
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sil_vtable IntermediateClass {
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}
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// CHECK-LABEL: sil_vtable ConformingClass {
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// CHECK-NEXT: conformance ConformingClass: FastCastBaseProtocol module main
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// CHECK-NEXT: no_conformance FastCastIntermediateProtocol
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// CHECK-NEXT: }
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sil_vtable ConformingClass {
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}
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// CHECK-LABEL: sil_vtable NonConformingClass {
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// CHECK-NEXT: no_conformance FastCastBaseProtocol
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// CHECK-NEXT: no_conformance FastCastIntermediateProtocol
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// CHECK-NEXT: }
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sil_vtable NonConformingClass {
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}
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// CHECK-LABEL: sil_vtable ConformingClass2 {
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// CHECK-NEXT: no_conformance FastCastBaseProtocol
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// CHECK-NEXT: conformance ConformingClass2: FastCastIntermediateProtocol module main
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// CHECK-NEXT: }
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sil_vtable ConformingClass2 {
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}
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// Ineligible Classes (should not be optimized)
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@_semantics("fast_cast")
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protocol P2: GenBase {}
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class GenBase {}
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class GenericClass<T> : GenBase, P2 {}
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class C2 : GenBase {}
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// CHECK-LABEL: sil_vtable GenericClass {
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// CHECK-NEXT: }
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sil_vtable GenericClass {
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}
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// CHECK-LABEL: sil_vtable C2 {
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// CHECK-NEXT: }
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sil_vtable C2 {
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}
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@_semantics("fast_cast")
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protocol P3: Base3 {}
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class Base3 {}
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open class OpenClass : Base3, P3 {}
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class C3 : Base3 {}
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// CHECK-LABEL: sil_vtable OpenClass {
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// CHECK-NEXT: }
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sil_vtable OpenClass {
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}
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// CHECK-LABEL: sil_vtable C3 {
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// CHECK-NEXT: }
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sil_vtable C3 {
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}
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