Skip block context within call contexts when searching for parameters

Only the call context contains the signal parameters. However, there can
be any number of nested block contexts in a function. This manifests
itself when the function needs an execution context. The simplest way to
trigger this is attaching a debugger.

Fixes: QTBUG-75393
Change-Id: Iabdc06a9fe7bf88204525d6940b626575fee1579
Reviewed-by: Simon Hausmann <[email protected]>

1 files changed, 11 insertions, 5 deletions

diff --git a/src/qml/jsruntime/qv4qmlcontext.cpp b/src/qml/jsruntime/qv4qmlcontext.cpp
index 12ada7ee70..0c5226d46c 100644
--- a/src/qml/jsruntime/qv4qmlcontext.cpp
+++ b/src/qml/jsruntime/qv4qmlcontext.cpp
@@ -458,11 +458,17 @@ ReturnedValue QQmlContextWrapper::resolveQmlContextPropertyLookupGetter(Lookup *
     // into the handler expression through the locals of the call context. So for onClicked: { ... }
     // the parameters of the clicked signal are injected and we must allow for them to be found here
     // before any other property from the QML context.
-    ExecutionContext &ctx = static_cast<ExecutionContext &>(engine->currentStackFrame->jsFrame->context);
-    if (ctx.d()->type == Heap::ExecutionContext::Type_CallContext) {
-        uint index = ctx.d()->internalClass->indexOfValueOrGetter(name);
-        if (index < UINT_MAX)
-            return static_cast<Heap::CallContext*>(ctx.d())->locals[index].asReturnedValue();
+    for (Heap::ExecutionContext *ctx = engine->currentContext()->d(); ctx; ctx = ctx->outer) {
+        if (ctx->type == Heap::ExecutionContext::Type_CallContext) {
+            const uint index = ctx->internalClass->indexOfValueOrGetter(name);
+            if (index < std::numeric_limits<uint>::max())
+                return static_cast<Heap::CallContext *>(ctx)->locals[index].asReturnedValue();
+        }
+
+        // Skip only block contexts within the current call context.
+        // Other contexts need a regular QML property lookup. See below.
+        if (ctx->type != Heap::ExecutionContext::Type_BlockContext)
+            break;
     }
 
     bool hasProperty = false;