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DefinitionShadower: fix crash with C++20 concepts

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In principle, for a TemplateDecl, `isDefinition()` issues a recursive
call passing the templated decl as a parameter.  A `ConceptDecl` is
derived from `TemplateDecl`, however, it should always be considered
a definition.

Also, update the DeclShadowing test incorporating a C++20 concept.

Fixes #12779.
This commit is contained in:
Javier Lopez-Gomez 2023-05-07 19:31:22 +02:00 committed by jenkins
parent ad5841e05c
commit 5f576a2ba8
2 changed files with 21 additions and 4 deletions
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6
lib/Interpreter/DefinitionShadower.cpp
View File

@ -35,7 +35,9 @@ namespace cling {
&& (SM.getFileID(SM.getIncludeLoc(FID)) == SM.getMainFileID());
}
/// \brief Returns whether the given {Function,Tag,Var}Decl/TemplateDecl is a definition.
/// \brief Returns whether a declaration is a definition. A `TemplateDecl` is
/// a definition if the templated decl is itself a definition; a concept is
/// always considered a definition.
static bool isDefinition(const Decl *D) {
if (auto FD = dyn_cast<FunctionDecl>(D))
return FD->isThisDeclarationADefinition();
@ -44,7 +46,7 @@ namespace cling {
if (auto VD = dyn_cast<VarDecl>(D))
return VD->isThisDeclarationADefinition();
if (auto TD = dyn_cast<TemplateDecl>(D))
return isDefinition(TD->getTemplatedDecl());
return isa<ConceptDecl>(TD) || isDefinition(TD->getTemplatedDecl());
return true;
}

19
test/CodeUnloading/DeclShadowing.C
View File

@ -6,14 +6,17 @@
// LICENSE.TXT for details.
//------------------------------------------------------------------------------
// RUN: cat %s | %cling 2>&1 | FileCheck %s
// RUN: cat %s | %cling 2>&1 | FileCheck --implicit-check-not error: %s
#include "cling/Interpreter/Interpreter.h"
#include "cling/Utils/AST.h"
#include "clang/AST/Decl.h"
#include <type_traits>
#if __cplusplus > 202002L
#include <concepts>
#endif
#include <cstdlib>
#include <string>
#include <type_traits>
unsigned _i;
struct _X {};
@ -98,6 +101,18 @@ f(33)
f(3.3f)
//CHECK-NEXT: (int) 21930
#if __cplusplus > 202002L
template <typename T>
concept IsIntegral = false;
// Replace concept definition; no error is expected in `constrained_fn(10)` below
template <typename T>
concept IsIntegral = std::is_integral<T>::value;
void constrained_fn(IsIntegral auto x) {}
void g() { constrained_fn(10); }
#endif
cling::runtime::gClingOpts->AllowRedefinition = 0;
// ==== Check DeclContext