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Fix __uuidof handling on non-type template parameter in C++17 

Clang used to pass the base lvalue of a non-type template parameter
to the template instantiation phase when the base part is __uuidof
and it's running in C++17 mode.
However, that drops its LValuePath, and unintentionally transforms
&__uuidof(...) to __uuidof(...).

This CL fixes that by passing whole expr. Fixes PR24986.

https://reviews.llvm.org/D46820?id=146557
Patch from Taiju Tsuiki <tzik@chromium.org>!

llvm-svn: 332614
This commit is contained in:
Nico Weber 2018-05-17 15:26:37 +00:00
parent c8dd6ccc8a
commit d60bbcee98
2 changed files with 14 additions and 1 deletions
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2
clang/lib/Sema/SemaTemplate.cpp
View File

@ -6245,7 +6245,7 @@ ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param,
// -- a predefined __func__ variable
if (auto *E = Value.getLValueBase().dyn_cast<const Expr*>()) {
if (isa<CXXUuidofExpr>(E)) {
Converted = TemplateArgument(const_cast<Expr*>(E));
Converted = TemplateArgument(ArgResult.get());
break;
}
Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref)

13
clang/test/SemaCXX/ms-uuid.cpp
View File

@ -1,4 +1,5 @@
// RUN: %clang_cc1 -fsyntax-only -verify -fms-extensions %s -Wno-deprecated-declarations
// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify -fms-extensions %s -Wno-deprecated-declarations
typedef struct _GUID {
unsigned long Data1;
@ -92,4 +93,16 @@ class __declspec(uuid("000000A0-0000-0000-C000-000000000049"))
// the previous case).
[uuid("000000A0-0000-0000-C000-000000000049"),
uuid("000000A0-0000-0000-C000-000000000049")] class C10;
template <const GUID* p>
void F1() {
// Regression test for PR24986. The given GUID should just work as a pointer.
const GUID* q = p;
}
void F2() {
// The UUID should work for a non-type template parameter.
F1<&__uuidof(C1)>();
}
}