Treat substitution free template string literals as string bindings

Before this change, they were treated as script bindings, which are less
efficient, and could not be used in ListElement.

Fixes: QTBUG-95139
Pick-to: 6.2
Change-Id: Ic66052c7f58b3ffdf1b7c0c169f42b4f99df62a1
Reviewed-by: Maximilian Goldstein <max.goldstein@qt.io>
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/qml/compiler/qqmlirbuilder.cpp b/src/qml/compiler/qqmlirbuilder.cpp
index c623fcfd6e..e213f5dbe9 100644
--- a/src/qml/compiler/qqmlirbuilder.cpp
+++ b/src/qml/compiler/qqmlirbuilder.cpp
@@ -1125,6 +1125,12 @@ void IRBuilder::setBindingValue(QV4::CompiledData::Binding *binding, QQmlJS::AST
         if (QQmlJS::AST::StringLiteral *lit = QQmlJS::AST::cast<QQmlJS::AST::StringLiteral *>(expr)) {
             binding->type = QV4::CompiledData::Binding::Type_String;
             binding->stringIndex = registerString(lit->value.toString());
+        } else if (QQmlJS::AST::TemplateLiteral *templateLit = QQmlJS::AST::cast<QQmlJS::AST::TemplateLiteral *>(expr);
+                   templateLit && templateLit->hasNoSubstitution) {
+            // A template literal without substitution is just a string.
+            // With substitution, it could however be an arbitrarily complex expression
+            binding->type = QV4::CompiledData::Binding::Type_String;
+            binding->stringIndex = registerString(templateLit->value.toString());
         } else if (expr->kind == QQmlJS::AST::Node::Kind_TrueLiteral) {
             binding->type = QV4::CompiledData::Binding::Type_Boolean;
             binding->value.b = true;