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.
124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
// Tests that redefinitions in different TUs could be merged correctly and the
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// redefinitions in the same TUs could be merged diagnosticed correctly.
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//
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// RUN: rm -rf %t
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// RUN: mkdir %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 -I%t %t/normal.cpp -verify -fsyntax-only
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// RUN: %clang_cc1 -std=c++20 -I%t %t/M1.cppm -verify -fsyntax-only
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// RUN: %clang_cc1 -std=c++20 -I%t %t/M2.cppm -verify -fsyntax-only
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// RUN: %clang_cc1 -std=c++20 -I%t %t/M3.cppm -verify -fsyntax-only
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// RUN: %clang_cc1 -std=c++20 -I%t %t/M.cppm -emit-module-interface -o %t/M.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use1.cpp -verify -fsyntax-only
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use2.cpp -verify -fsyntax-only
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// / Test again with reduced BMI.
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// RUN: %clang_cc1 -std=c++20 -I%t %t/M.cppm -emit-reduced-module-interface -o %t/M.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use1.cpp -verify -fsyntax-only
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use2.cpp -verify -fsyntax-only
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//
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//--- foo.h
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#ifndef FOO
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#define FOO
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inline void func() {}
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template <typename T>
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T templ_func(T t) { return t; }
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struct S {};
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template <class C>
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struct T { C c; };
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inline int v = 43;
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#endif
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// If we copy foo.h directly, there are other warnings.
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//--- redef.h
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#ifndef REDEF
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#define REDEF
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inline void func() {}
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template <typename T>
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T templ_func(T t) { return t; }
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struct S {};
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template <class C>
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struct T { C c; };
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inline int v = 43;
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#endif
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//--- normal.cpp
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#include "foo.h"
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#include "redef.h"
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// expected-error@* {{redefinition of 'func'}}
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// expected-error@* {{redefinition of 'templ_func'}}
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// expected-error@* {{redefinition of 'S'}}
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// expected-error@* {{redefinition of 'T'}}
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// expected-error@* {{redefinition of 'v'}}
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// expected-note@* 1+{{previous definition is here}}
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//--- M1.cppm
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// These declarations are in the same TU. The compiler should complain.
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module;
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#include "foo.h"
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#include "redef.h"
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export module M1;
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// expected-error@* {{redefinition of 'func'}}
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// expected-error@* {{redefinition of 'templ_func'}}
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// expected-error@* {{redefinition of 'S'}}
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// expected-error@* {{redefinition of 'T'}}
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// expected-error@* {{redefinition of 'v'}}
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// expected-note@* 1+{{previous definition is here}}
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//--- M2.cppm
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// These declarations are in the same TU and the redefinitions are in the named modules.
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// The compiler should complain.
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module;
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#include "foo.h"
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export module M2;
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#include "redef.h"
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// FIXME: The diagnostic message looks not so good.
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//
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// expected-error@* {{declaration of 'func' in module M2 follows declaration in the global module}}
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// expected-error@* {{declaration of 'templ_func' in module M2 follows declaration in the global module}}
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// expected-error@* {{redefinition of 'S'}}
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// expected-error@* {{redefinition of 'T'}}
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// expected-error@* {{declaration of 'v' in module M2 follows declaration in the global module}}
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// expected-note@* 1+{{previous definition is here}}
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// expected-note@* 1+{{previous declaration is here}}
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//--- M3.cppm
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// These declarations are in the same TU. The compiler should complain.
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export module M3;
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#include "foo.h"
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#include "redef.h"
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// expected-error@* {{redefinition of 'func'}}
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// expected-error@* {{redefinition of 'templ_func'}}
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// expected-error@* {{redefinition of 'S'}}
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// expected-error@* {{redefinition of 'T'}}
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// expected-error@* {{redefinition of 'v'}}
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// expected-note@* 1+{{previous definition is here}}
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//--- M.cppm
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module;
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#include "foo.h"
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export module M;
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export using ::func;
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export using ::templ_func;
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export using ::S;
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export using ::T;
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export using ::v;
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//--- Use1.cpp
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// These declarations are not in the same TU. The compiler shouldn't complain.
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// expected-no-diagnostics
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#include "foo.h"
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import M;
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//--- Use2.cpp
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// These declarations are not in the same TU. The compiler shouldn't complain.
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// expected-no-diagnostics
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import M;
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#include "foo.h"
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