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.
96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
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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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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std10-1-ex2-tu1.cpp \
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// RUN: -o %t/B_Y.pcm
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std10-1-ex2-tu2.cpp \
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// RUN: -fmodule-file=B:Y=%t/B_Y.pcm -o %t/B.pcm
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std10-1-ex2-tu3.cpp \
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// RUN: -o %t/B_X1.pcm -verify
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std10-1-ex2-tu4.cpp \
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// RUN: -fmodule-file=B=%t/B.pcm -fmodule-file=B:Y=%t/B_Y.pcm -o %t/B_X2.pcm
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//
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// RUN: %clang_cc1 -std=c++20 -emit-obj %t/std10-1-ex2-tu5.cpp \
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// RUN: -fmodule-file=B=%t/B.pcm -fmodule-file=B:Y=%t/B_Y.pcm -o %t/b_tu5.o
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//
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// RUN: %clang_cc1 -std=c++20 -S %t/std10-1-ex2-tu6.cpp \
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// RUN: -fmodule-file=B=%t/B.pcm -fmodule-file=B:Y=%t/B_Y.pcm -o %t/b_tu6.s -verify
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/std10-1-ex2-tu7.cpp \
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// RUN: -fmodule-file=B:X2=%t/B_X2.pcm -fmodule-file=B=%t/B.pcm \
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// RUN: -fmodule-file=B:Y=%t/B_Y.pcm -o %t/B_X3.pcm -verify
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// Test again with reduced BMI.
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// RUN: rm %t/B_X2.pcm %t/B.pcm %t/B_Y.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/std10-1-ex2-tu1.cpp \
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// RUN: -o %t/B_Y.pcm
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//
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/std10-1-ex2-tu2.cpp \
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// RUN: -fmodule-file=B:Y=%t/B_Y.pcm -o %t/B.pcm
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//
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/std10-1-ex2-tu3.cpp \
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// RUN: -o %t/B_X1.pcm -verify
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//
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/std10-1-ex2-tu4.cpp \
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// RUN: -fmodule-file=B=%t/B.pcm -fmodule-file=B:Y=%t/B_Y.pcm -o %t/B_X2.pcm
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//
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// RUN: %clang_cc1 -std=c++20 -emit-obj %t/std10-1-ex2-tu5.cpp \
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// RUN: -fmodule-file=B=%t/B.pcm -fmodule-file=B:Y=%t/B_Y.pcm -o %t/b_tu5.o
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//
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// RUN: %clang_cc1 -std=c++20 -S %t/std10-1-ex2-tu6.cpp \
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// RUN: -fmodule-file=B=%t/B.pcm -fmodule-file=B:Y=%t/B_Y.pcm -o %t/b_tu6.s -verify
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//
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/std10-1-ex2-tu7.cpp \
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// RUN: -fmodule-file=B:X2=%t/B_X2.pcm -fmodule-file=B=%t/B.pcm \
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// RUN: -fmodule-file=B:Y=%t/B_Y.pcm -o %t/B_X3.pcm -verify
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//--- std10-1-ex2-tu1.cpp
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module B:Y;
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int y();
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// expected-no-diagnostics
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//--- std10-1-ex2-tu2.cpp
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export module B;
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import :Y;
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int n = y();
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// expected-no-diagnostics
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//--- std10-1-ex2-tu3.cpp
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module B:X1; // does not implicitly import B
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int &a = n; // expected-error {{use of undeclared identifier }}
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//--- std10-1-ex2-tu4.cpp
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module B:X2; // does not implicitly import B
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import B;
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int &b = n; // OK
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// expected-no-diagnostics
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//--- std10-1-ex2-tu5.cpp
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module B; // implicitly imports B
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int &c = n; // OK
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// expected-no-diagnostics
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//--- std10-1-ex2-tu6.cpp
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import B;
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// error, n is module-local and this is not a module.
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int &c = n; // expected-error {{declaration of 'n' must be imported}}
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// expected-note@* {{declaration here is not visible}}
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//--- std10-1-ex2-tu7.cpp
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// expected-no-diagnostics
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module B:X3; // does not implicitly import B
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import :X2; // X2 is an implementation unit import B.
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// According to [module.import]p7:
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// Additionally, when a module-import-declaration in a module unit of some
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// module M imports another module unit U of M, it also imports all
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// translation units imported by non-exported module-import-declarations in
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// the module unit purview of U.
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//
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// So B is imported in B:X3 due to B:X2 imported B. So n is visible here.
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int &c = n;
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