QScript: do not crash on PowerPC

There is no 'this' register in the global context.
The computation of the this register for the global context
gives the 'codeBlock' register in the frame header.

On Intel processor, a JSValue() is 0x0 when converted to a pointer,
but this is not the case on PowerPC  (it is 0xfffffff9) so it just
crash later when acessing the code block.

Solution: special condition for the global context when getting the
'this' object

Reviewed-by: Kent Hansen

1 files changed, 2 insertions, 2 deletions

diff --git a/src/script/api/qscriptengine.cpp b/src/script/api/qscriptengine.cpp
index 09042e1..3402190 100644
--- a/src/script/api/qscriptengine.cpp
+++ b/src/script/api/qscriptengine.cpp
@@ -805,7 +805,6 @@ QScriptEnginePrivate::QScriptEnginePrivate()
     JSC::JSGlobalObject *globalObject = new (globalData)QScript::GlobalObject();
 
     JSC::ExecState* exec = globalObject->globalExec();
-    *thisRegisterForFrame(exec) = JSC::JSValue();
 
     scriptObjectStructure = QScriptObject::createStructure(globalObject->objectPrototype());
 
@@ -1079,12 +1078,13 @@ JSC::JSValue QScriptEnginePrivate::toUsableValue(JSC::JSValue value)
 /*!
     \internal
     Return the 'this' value for a given context
-    The result may be null for the global context
 */
 JSC::JSValue QScriptEnginePrivate::thisForContext(JSC::ExecState *frame)
 {
     if (frame->codeBlock() != 0) {
         return frame->thisValue();
+    } else if(frame == frame->lexicalGlobalObject()->globalExec()) {
+        return frame->globalThisValue();
     } else {
         JSC::Register *thisRegister = thisRegisterForFrame(frame);
         return thisRegister->jsValue();