ES7: Detect Tail Position Calls and pass that to the runtime

Doing the tail call in the runtime will come in a follow-up patch

Change-Id: I8224aac0edbdc765ee9b97703948edd52fd33f3e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/qml/compiler/qv4compilercontext_p.h b/src/qml/compiler/qv4compilercontext_p.h
index 63306b3672..a29f4ea4cb 100644
--- a/src/qml/compiler/qv4compilercontext_p.h
+++ b/src/qml/compiler/qv4compilercontext_p.h
@@ -343,6 +343,17 @@ struct Context {
     void emitBlockFooter(Compiler::Codegen *codegen);
 
     void setupFunctionIndices(Moth::BytecodeGenerator *bytecodeGenerator);
+
+    bool canHaveTailCalls() const
+    {
+        if (!isStrict)
+            return false;
+        if (contextType == ContextType::Function)
+            return !isGenerator;
+        if (contextType == ContextType::Block && parent)
+            return parent->canHaveTailCalls();
+        return false;
+    }
 };