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[CIR] Add empty handlers for Using and UsingShadow decls #143032

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Merged
merged 1 commit into from
Jun 5, 2025
Merged

[CIR] Add empty handlers for Using and UsingShadow decls #143032

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5 changes: 5 additions & 0 deletions clang/lib/CIR/CodeGen/CIRGenModule.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1135,6 +1135,7 @@ void CIRGenModule::emitTopLevelDecl(Decl *decl) {
emitGlobalOpenACCDecl(cast<OpenACCDeclareDecl>(decl));
break;
case Decl::Enum:
case Decl::Using: // using X; [C++]
case Decl::UsingDirective: // using namespace X; [C++]
case Decl::Typedef:
case Decl::TypeAlias: // using foo = bar; [C++11]
Expand All @@ -1143,6 +1144,10 @@ void CIRGenModule::emitTopLevelDecl(Decl *decl) {
assert(!cir::MissingFeatures::generateDebugInfo());
break;

// No code generation needed.
case Decl::UsingShadow:
break;

// C++ Decls
case Decl::LinkageSpec:
case Decl::Namespace:
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43 changes: 43 additions & 0 deletions clang/test/CIR/CodeGen/namespace.cpp
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Expand Up @@ -50,3 +50,46 @@ int f4(void) {
// CHECK: %[[G3_ADDR:.*]] = cir.get_global @_ZN4test5test22g3E : !cir.ptr<!s32i>
// CHECK: %[[G3_VAL:.*]] = cir.load{{.*}} %[[G3_ADDR]] : !cir.ptr<!s32i>, !s32i
// CHECK: %[[SUM2:.*]] = cir.binop(add, %[[SUM]], %[[G3_VAL]]) nsw : !s32i

using test2::f3;
using test2::g3;

int f5() {
f3();
return g3;
}

// CHECK: cir.func @_Z2f5v()
// CHECK: cir.call @_ZN4test5test22f3Ev()
// CHECK: %[[G3_ADDR:.*]] = cir.get_global @_ZN4test5test22g3E : !cir.ptr<!s32i>
// CHECK: %[[G3_VAL:.*]] = cir.load{{.*}} %[[G3_ADDR]] : !cir.ptr<!s32i>, !s32i

namespace test3 {
struct S {
int a;
} s;
}

using test3::s;

int f6() {
return s.a;
}

// CHECK: cir.func @_Z2f6v()
// CHECK: cir.get_global @_ZN5test31sE : !cir.ptr<!rec_test33A3AS>
// CHECK: cir.get_member %{{.*}}[0] {name = "a"}

int shadowedFunc() {
return 3;
}

namespace shadow {
using ::shadowedFunc;
}

void f7() {
shadow::shadowedFunc();
}

// CHECK: cir.func @_Z2f7v()
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