V4 Debugger: Allow executing jobs on contexts without v4Function

Previously this would crash as it tried to determine strict mode by
querying the function. Check the functions of out contexts, too, and
finally try the global context if none is found.

Change-Id: Ib21c2f4f242a67909944b71640a154ff181c33e1
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 7 insertions, 4 deletions

diff --git a/src/plugins/qmltooling/qmldbg_debugger/qv4debugjob.cpp b/src/plugins/qmltooling/qmldbg_debugger/qv4debugjob.cpp
index e852f574a7..8b51574525 100644
--- a/src/plugins/qmltooling/qmldbg_debugger/qv4debugjob.cpp
+++ b/src/plugins/qmltooling/qmldbg_debugger/qv4debugjob.cpp
@@ -67,11 +67,11 @@ void JavaScriptJob::run()
     QV4::ScopedContext ctx(scope, engine->currentContext());
     QObject scopeObject;
 
+    QV4::CppStackFrame *frame = engine->currentStackFrame;
     if (frameNr > 0) {
-        QV4::CppStackFrame *f = engine->currentStackFrame;
         for (int i = 0; i < frameNr; ++i)
-            f = f->parent;
-        ctx = static_cast<QV4::ExecutionContext *>(&f->jsFrame->context);
+            frame = frame->parent;
+        ctx = static_cast<QV4::ExecutionContext *>(&frame->jsFrame->context);
     }
 
     if (context >= 0) {
@@ -103,7 +103,10 @@ void JavaScriptJob::run()
     }
 
     QV4::Script script(ctx, QV4::Compiler::EvalCode, this->script);
-    script.strictMode = ctx->d()->v4Function->isStrict();
+    if (QV4::Function *function = frame->v4Function)
+        script.strictMode = function->isStrict();
+    else if (engine->globalCode)
+        script.strictMode = engine->globalCode->isStrict();
     // In order for property lookups in QML to work, we need to disable fast v4 lookups. That
     // is a side-effect of inheritContext.
     script.inheritContext = true;