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bac5d0e9a1
When Swift imports C structs, it synthesizes an initializer that takes no arguments and zero-initializes the C struct. When C++ interop is enabled, Clang treats all C structs as if they were C++ structs. This means that some of the C structs will get a default constructor implicitly generated by Clang. This implicit default constructor will not zero-initialize trivial fields of the struct. This is a common source of confusion and subtle bugs for developers who try to enable C++ interop in existing projects that use C interop and rely on zero-initialization of C structs. rdar://115909532
53 lines
2.7 KiB
Swift
53 lines
2.7 KiB
Swift
// Target-specific tests for C++ constructor call code generation.
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// RUN: %swift -module-name MySwift -target aarch64-unknown-linux-android -dump-clang-diagnostics -I %S/Inputs -enable-experimental-cxx-interop -emit-ir %s -parse-stdlib -parse-as-library -disable-legacy-type-info -Xcc -fignore-exceptions | %FileCheck %s -check-prefix=ITANIUM_ARM
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// REQUIRES: OS=linux-android
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// REQUIRES: CPU=aarch64
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import Constructors
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import TypeClassification
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public func createHasVirtualBase() -> HasVirtualBase {
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// ITANIUM_ARM: define protected swiftcc void @"$s7MySwift20createHasVirtualBaseSo0deF0VyF"(ptr noalias sret({{.*}}) %0)
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// To verify that the thunk is inlined, make sure there's no intervening
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// `define`, i.e. the call to the C++ constructor happens in
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// createHasVirtualBase(), not some later function.
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// ITANIUM_ARM-NOT: define
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// Note `this` return type.
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// ITANIUM_ARM: call void @_ZN14HasVirtualBaseC1E7ArgType(ptr %{{[0-9]+}}, i64 %{{[0-9]+}})
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return HasVirtualBase(ArgType())
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}
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public func createImplicitDefaultConstructor() -> ImplicitDefaultConstructor {
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// ITANIUM_ARM: define protected swiftcc i32 @"$s7MySwift32createImplicitDefaultConstructorSo0deF0VyF"()
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// ITANIUM_ARM-NOT: define
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// Note `this` return type.
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// ITANIUM_ARM: call void @llvm.memset.p0.i64
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// ITANIUM_ARM: call void @_ZN26ImplicitDefaultConstructorC2Ev(ptr %{{[0-9]+}})
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return ImplicitDefaultConstructor()
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}
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public func createStructWithSubobjectCopyConstructorAndValue() {
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// ITANIUM_ARM-LABEL: define protected swiftcc void @"$s7MySwift48createStructWithSubobjectCopyConstructorAndValueyyF"()
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// ITANIUM_ARM: [[MEMBER:%.*]] = alloca %TSo33StructWithCopyConstructorAndValueV
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// ITANIUM_ARM: [[OBJ:%.*]] = alloca %TSo42StructWithSubobjectCopyConstructorAndValueV
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// ITANIUM_ARM: [[TMP:%.*]] = alloca %TSo33StructWithCopyConstructorAndValueV
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// ITANIUM_ARM: call void @_ZN33StructWithCopyConstructorAndValueC2Ev(ptr [[MEMBER]])
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// ITANIUM_ARM: call void @_ZN33StructWithCopyConstructorAndValueC2ERKS_(ptr [[TMP]], ptr [[MEMBER]])
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// ITANIUM_ARM: ret void
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let member = StructWithCopyConstructorAndValue()
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let obj = StructWithSubobjectCopyConstructorAndValue(member: member)
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}
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public func createTemplatedConstructor() {
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// ITANIUM_ARM-LABEL: define protected swiftcc void @"$s7MySwift26createTemplatedConstructoryyF"()
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// ITANIUM_ARM: [[OBJ:%.*]] = alloca %TSo20TemplatedConstructorV
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// ITANIUM_ARM: [[IVAL:%.*]] = load i64, ptr
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// ITANIUM_ARM: call void @_ZN20TemplatedConstructorC2I7ArgTypeEET_(ptr [[OBJ]], i64 [[IVAL]])
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// ITANIUM_ARM: ret void
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// ITANIUM_ARM-LABEL: define {{.*}}void @_ZN20TemplatedConstructorC2I7ArgTypeEET_(ptr {{.*}}, i64 {{.*}})
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let templated = TemplatedConstructor(ArgType())
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}
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