0f7aaeb324
Close https://github.com/llvm/llvm-project/issues/71347 Previously I misread the concept of module purview. I thought if a declaration attached to a unnamed module, it can't be part of the module purview. But after the issue report, I recognized that module purview is more of a concept about locations instead of semantics. Concretely, the things in the language linkage after module declarations can be exported. This patch refactors `Module::isModulePurview()` and introduces some possible code cleanups.
75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
// RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -o %t.0.pcm -verify -DTEST=0
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -o %t.1.pcm -verify -DTEST=1
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -fmodule-file=foo=%t.0.pcm -o %t.2.pcm -verify -DTEST=2
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -fmodule-file=foo=%t.0.pcm -o %t.3.pcm -verify -Dfoo=bar -DTEST=3
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#if TEST == 0 || TEST == 2
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// expected-no-diagnostics
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#endif
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export module foo;
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static int m;
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int n;
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#if TEST == 0
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export {
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int a;
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int b;
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constexpr int *p = &n;
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}
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export int c;
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namespace N {
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export void f() {}
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} // namespace N
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export struct T {
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} t;
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#elif TEST == 3
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int use_a = a; // expected-error {{use of undeclared identifier 'a'}}
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#undef foo
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import foo; // expected-error {{imports must immediately follow the module declaration}}
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export {}
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export {
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; // No diagnostic after P2615R1 DR
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}
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export {
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static_assert(true); // No diagnostic after P2615R1 DR
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}
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int use_b = b; // expected-error{{use of undeclared identifier 'b'}}
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int use_n = n; // FIXME: this should not be visible, because it is not exported
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extern int n;
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static_assert(&n != p); // expected-error{{use of undeclared identifier 'p'}}
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#endif
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#if TEST == 1
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struct S {
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export int n; // expected-error {{expected member name or ';'}}
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export static int n; // expected-error {{expected member name or ';'}}
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};
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#endif
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// FIXME: Exports of declarations without external linkage are disallowed.
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// Exports of declarations with non-external-linkage types are disallowed.
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// Cannot export within another export. This isn't precisely covered by the
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// language rules right now, but (per personal correspondence between zygoloid
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// and gdr) is the intent.
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#if TEST == 1
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export { // expected-note {{export block begins here}}
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extern "C++" {
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namespace NestedExport {
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export { // expected-error {{export declaration appears within another export declaration}}
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int q;
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}
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} // namespace NestedExport
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}
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}
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#endif
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