da00c60dae
Close https://github.com/llvm/llvm-project/issues/71034 See https://discourse.llvm.org/t/rfc-c-20-modules-introduce-thin-bmi-and-decls-hash/74755 This patch introduces reduced BMI, which doesn't contain the definitions of functions and variables if its definitions won't contribute to the ABI. Testing is a big part of the patch. We want to make sure the reduced BMI contains the same behavior with the existing and relatively stable fatBMI. This is pretty helpful for further reduction. The user interfaces part it left to following patches to ease the reviewing.
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
// Tests that the definition in private module fragment is not reachable to its users.
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//
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// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 %t/Private.cppm -emit-module-interface \
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// RUN: -o %t/Private.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cpp \
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// RUN: -DTEST_BADINLINE -verify -fsyntax-only
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// Test again with reduced BMI.
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// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 %t/Private.cppm -emit-reduced-module-interface \
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// RUN: -o %t/Private.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cpp \
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// RUN: -DTEST_BADINLINE -verify -fsyntax-only
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//--- Private.cppm
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export module Private;
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#ifdef TEST_BADINLINE
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inline void fn_m(); // expected-error {{un-exported inline function not defined before the private module fragment}}
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// expected-note@Private.cppm:13 {{private module fragment begins here}}
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#endif
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static void fn_s();
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export struct X;
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export void g(X *x) {
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fn_s(); // OK, call to static function in same translation unit
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#ifdef TEST_BADINLINE
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fn_m(); // fn_m is not OK.
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#endif
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}
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export X *factory(); // OK
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module :private;
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struct X {}; // definition not reachable from importers of A
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X *factory() {
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return new X();
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}
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void fn_m() {}
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void fn_s() {}
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//--- Use.cpp
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import Private;
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void foo() {
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X x; // expected-error 1+{{missing '#include'; 'X' must be defined before it is used}}
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// expected-note@Private.cppm:18 1+{{definition here is not reachable}}
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auto _ = factory();
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auto *__ = factory();
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X *___ = factory();
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g(__);
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g(___);
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g(factory());
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}
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