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f830b1c665
If we try to import this in ObjC interop mode:
```objc
typedef CF_OPTIONS(uint32_t, MyFlags) {
...
} CF_SWIFT_NAME(MyCtx.Flags);
struct MyStruct {
MyFlags flags;
...
} CF_SWIFT_NAME(MyCtx);
```
ClangImporter tries to import `MyCtx/MyStruct` before it imports
`MyFlags` (via `importDeclContextOf()`), which in turn tries to import
`MyFlags` again due to the `flags` field. The existing cycle-breaking
mechanism prevents us from looping infinitely, but leads us to import
two copies of the Swift `EnumDecl`, which can cause errors later during
CodeGen.
~~This patch adds an assertion to catch such issues earlier, and breaks
the cycle by checking the cache again.~~ This patch no longer does so
because that caused issues beyond the scope of this patch.
rdar://162317760
38 lines
1.1 KiB
Swift
38 lines
1.1 KiB
Swift
// RUN: split-file %s %t
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// RUN: %target-swift-frontend -typecheck -verify -I %t/Inputs -cxx-interoperability-mode=default -module-name main %t/program.swift
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// RUN: %target-swift-frontend -typecheck -verify -I %t/Inputs -cxx-interoperability-mode=off -module-name main %t/program.swift
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// REQUIRES: objc_interop
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//--- Inputs/module.modulemap
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module TheModule {
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header "the-header.h"
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}
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//--- Inputs/the-header.h
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#pragma once
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#define CF_SWIFT_NAME(_name) __attribute__((swift_name(#_name)))
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#define __CF_OPTIONS_ATTRIBUTES __attribute__((flag_enum,enum_extensibility(open)))
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#if (__cplusplus)
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#define CF_OPTIONS(_type, _name) __attribute__((availability(swift,unavailable))) _type _name; enum __CF_OPTIONS_ATTRIBUTES : _name
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#else
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#define CF_OPTIONS(_type, _name) enum __CF_OPTIONS_ATTRIBUTES _name : _type _name; enum _name : _type
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#endif
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typedef CF_OPTIONS(unsigned, TheFlags) {
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TheFlagsFoo = (1 << 1),
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TheFlagsBar = (1 << 2)
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} CF_SWIFT_NAME(The.Flags);
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typedef TheFlags DaFlags;
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struct TheContext {
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TheFlags flags;
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} CF_SWIFT_NAME(The);
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//--- program.swift
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import TheModule
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func f(_ _: DaFlags) {}
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