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.
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
// RUN: rm -rf %t
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// RUN: split-file %s %t
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// RUN: cd %t
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//
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// RUN: %clang_cc1 -std=c++20 %t/a.cppm -emit-module-interface -o %t/a.pcm
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// RUN: %clang_cc1 -module-file-info %t/a.pcm | FileCheck %t/a.cppm
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// RUN: %clang_cc1 -std=c++20 %t/b.cpp -fmodule-file=a=%t/a.pcm -fsyntax-only -verify
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// RUN: %clang_cc1 -std=c++20 %t/c.cppm -emit-module-interface -o %t/c.pcm
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// RUN: %clang_cc1 -std=c++20 %t/d.cpp -fsyntax-only -verify -fmodule-file=c=%t/c.pcm
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// RUN: %clang_cc1 -std=c++20 %t/a.cppm -emit-reduced-module-interface -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 %t/b.cpp -fmodule-file=a=%t/a.pcm -fsyntax-only -verify
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// RUN: %clang_cc1 -std=c++20 %t/c.cppm -fsyntax-only -verify
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// RUN: %clang_cc1 -module-file-info %t/a.pcm | FileCheck %t/a.cppm
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//--- a.cppm
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export module a;
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export extern "C++" int foo() { return 43; }
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export extern "C++" {
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int a();
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int b();
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int c();
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}
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export {
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extern "C++" void f1();
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extern "C++" void f2();
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extern "C++" void f3();
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}
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extern "C++" void unexported();
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// CHECK: Sub Modules:
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// CHECK-NEXT: Implicit Module Fragment '<implicit global>'
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//--- b.cpp
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import a;
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int use() {
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a();
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b();
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c();
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f1();
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f2();
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f3();
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unexported(); // expected-error {{declaration of 'unexported' must be imported from module 'a' before it is required}}
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// expected-note@a.cppm:15 {{declaration here is not visible}}
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return foo();
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}
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//--- c.cppm
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// expected-no-diagnostics
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export module c;
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extern "C++" {
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export int f();
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int h();
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}
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extern "C++" export int g();
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//--- d.cpp
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import c;
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int use() {
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return f() + g();
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}
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int use_of_nonexported() {
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return h(); // expected-error {{declaration of 'h' must be imported from module 'c' before it is required}}
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// expected-note@c.cppm:5 {{declaration here is not visible}}
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}
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