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[clang] Do not serialize function definitions without a body (#121550)

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An instantiated templated function definition may not have a body due to
parsing errors inside the templated function. When serializing, an
assert is triggered inside `ASTRecordWriter::AddFunctionDefinition`.

The instantiation may happen on an intermediate module.

The test case was reduced from `mp-units`.
This commit is contained in:
Alejandro Álvarez Ayllón 2025-01-06 11:52:11 +01:00 committed by GitHub
parent 3134045739
commit a13bcf3ced
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8
clang/lib/Serialization/ASTWriter.cpp
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@ -7230,6 +7230,10 @@ void ASTWriter::CompletedImplicitDefinition(const FunctionDecl *D) {
if (!D->isFromASTFile())
return; // Declaration not imported from PCH.
// The function definition may not have a body due to parsing errors.
if (!D->doesThisDeclarationHaveABody())
return;
// Implicit function decl from a PCH was defined.
DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_FUNCTION_DEFINITION));
}
@ -7249,6 +7253,10 @@ void ASTWriter::FunctionDefinitionInstantiated(const FunctionDecl *D) {
if (!D->isFromASTFile())
return;
// The function definition may not have a body due to parsing errors.
if (!D->doesThisDeclarationHaveABody())
return;
DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_FUNCTION_DEFINITION));
}

42
clang/test/Modules/missing-body-in-import.cpp Normal file
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@ -0,0 +1,42 @@
// RUN: rm -rf %t
// RUN: split-file %s %t
// RUN: cd %t
// RUN: %clang_cc1 -std=c++23 mod1.cppm -emit-module-interface -o mod1.pcm -fallow-pcm-with-compiler-errors -verify
// RUN: %clang_cc1 -std=c++23 mod2.cppm -emit-module-interface -o mod2.pcm -fmodule-file=mod1=mod1.pcm -verify -fallow-pcm-with-compiler-errors
// RUN: %clang_cc1 -std=c++23 mod3.cppm -emit-module-interface -o mod3.pcm -fmodule-file=mod1=mod1.pcm -fmodule-file=mod2=mod2.pcm -verify -fallow-pcm-with-compiler-errors
// RUN: %clang_cc1 -std=c++23 main.cpp -fmodule-file=mod1=mod1.pcm -fmodule-file=mod2=mod2.pcm -fmodule-file=mod3=mod3.pcm -verify -fallow-pcm-with-compiler-errors -ast-dump-all
//--- mod1.cppm
export module mod1;
export template <unsigned N, unsigned M>
class A {
public:
constexpr A(const char[], const char[]) {
auto x = BrokenExpr; // expected-error {{use of undeclared identifier 'BrokenExpr'}}
}
};
export template<A<1,1> NTTP>
struct B {};
template < unsigned N, unsigned M >
A(const char (&)[N], const char (&)[M]) -> A< 1, 1 >;
//--- mod2.cppm
export module mod2;
import mod1;
struct C: B <A{"a", "b"}> { // expected-error {{non-type template argument is not a constant expression}}
constexpr C(int a) { }
};
//--- mod3.cppm
// expected-no-diagnostics
export module mod3;
export import mod2;
//--- main.cpp
// expected-no-diagnostics
import mod3; // no crash