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.
67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
// Based on C++20 10.2 example 5.
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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/std-10-2-ex5-tu1.cpp \
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// RUN: -o %t/M.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-obj %t/std-10-2-ex5-tu2.cpp \
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// RUN: -fmodule-file=M=%t/M.pcm -o %t/tu-2.o
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// RUN: %clang_cc1 -std=c++20 -emit-obj %t/std-10-2-ex5-tu3.cpp \
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// RUN: -fmodule-file=M=%t/M.pcm -verify -o %t/main.o
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// Test again with reduced BMI.
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// RUN: rm %t/M.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/std-10-2-ex5-tu1.cpp \
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// RUN: -o %t/M.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-obj %t/std-10-2-ex5-tu2.cpp \
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// RUN: -fmodule-file=M=%t/M.pcm -o %t/tu-2.o
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// RUN: %clang_cc1 -std=c++20 -emit-obj %t/std-10-2-ex5-tu3.cpp \
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// RUN: -fmodule-file=M=%t/M.pcm -verify -o %t/main.o
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//--- std-10-2-ex5-tu1.cpp
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export module M;
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export struct X {
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static void f();
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struct Y {};
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};
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namespace {
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struct S {};
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} // namespace
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export void f(S); // OK
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struct T {};
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export T id(T); // OK
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export struct A; // A exported as incomplete
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export auto rootFinder(double a) {
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return [=](double x) { return (x + a / x) / 2; };
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}
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export const int n = 5; // OK, n has external linkage
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//--- std-10-2-ex5-tu2.cpp
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module M;
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struct A {
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int value;
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};
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//--- std-10-2-ex5-tu3.cpp
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import M;
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int main() {
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X::f(); // OK, X is exported and definition of X is reachable
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X::Y y; // OK, X::Y is exported as a complete type
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auto f = rootFinder(2); // OK
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// error: A is incomplete
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return A{45}.value; // expected-error {{invalid use of incomplete type 'A'}}
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// expected-error@-1 {{member access into incomplete type 'A'}}
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// expected-note@std-10-2-ex5-tu1.cpp:12 2{{forward declaration of 'A'}}
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}
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