https://bugs.llvm.org/show_bug.cgi?id=47774
Bug ID: 47774
Summary: clang::TypeName::getFullyQualifiedName crashes on
certain input
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
In the following code:
template <template <typename T> class C>
struct S {};
template <typename U>
void bar(S<U::template foo>);
TypeName::getFullyQualifiedName() crashes on the type of the ParmVarDecl
S<U::template foo>, whose type is:
TemplateSpecializationType 0x62100004b940 'S<U::template foo>' dependent S
`-TemplateArgument template U::template foo
Fully contained code with the crash is below:
#include "clang/AST/QualTypeNames.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Tooling/Tooling.h"
using namespace clang;
using namespace tooling;
class ParmVarVisitor : public RecursiveASTVisitor<ParmVarVisitor> {
public:
bool VisitParmVarDecl(ParmVarDecl* pv) {
const auto& context = pv->getASTContext();
auto type = pv->getType();
PrintingPolicy pp{LangOptions{}};
TypeName::getFullyQualifiedName(type, context, pp);
return true;
}
};
int main() {
std::unique_ptr<ASTUnit> ast = buildASTFromCode(
"template <template <typename T> class C>\nstruct S {};\ntemplate
<typename U>\nvoid bar(S<U::template foo>);",
"foo.cc");
auto* TU = ast->getASTContext().getTranslationUnitDecl();
TU->dump();
llvm::errs() << "\n";
ParmVarVisitor{}.TraverseDecl(TU);
return 0;
}
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