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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang::TypeName::getFullyQualifiedName crashes on certain input"
href="https://bugs.llvm.org/show_bug.cgi?id=47774">47774</a>
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<th>Summary</th>
<td>clang::TypeName::getFullyQualifiedName crashes on certain input
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>awoolf@fb.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>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;
}</pre>
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