From 9c104bb97098f690e4c8af6e17b7217891a8c690 Mon Sep 17 00:00:00 2001
From: Lars Knoll <lars.knoll@digia.com>
Date: Mon, 10 Dec 2012 19:30:08 +0100
Subject: [PATCH] Properly set up the 'this' pointer

Make sure the this pointer is setup correctly for
function calls. Also make sure we set the strict mode
flag correctly in all functions.

Change-Id: Idaacc92bf6469145b7addfac2bbddea588e85c2d
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
---
 qmljs_engine.cpp      |  1 +
 qmljs_environment.cpp | 11 +++++++++--
 qmljs_objects.cpp     |  8 +-------
 qmljs_runtime.cpp     |  4 +---
 qv4codegen.cpp        |  3 ++-
 5 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/qmljs_engine.cpp b/qmljs_engine.cpp
index a694d3e..4da9564 100644
--- a/qmljs_engine.cpp
+++ b/qmljs_engine.cpp
@@ -177,6 +177,7 @@ ExecutionEngine::ExecutionEngine(MemoryManager *memoryManager, EvalISelFactory *
     VM::Object *glo = newObject(/*rootContext*/);
     globalObject = Value::fromObject(glo);
     rootContext->activation = glo;
+    rootContext->thisObject = Value::fromObject(glo);
 
     glo->__put__(rootContext, identifier(QStringLiteral("Object")), objectCtor);
     glo->__put__(rootContext, identifier(QStringLiteral("String")), stringCtor);
diff --git a/qmljs_environment.cpp b/qmljs_environment.cpp
index 4f2f798..9f900f9 100644
--- a/qmljs_environment.cpp
+++ b/qmljs_environment.cpp
@@ -210,7 +210,7 @@ void ExecutionContext::init(ExecutionEngine *eng)
 {
     engine = eng;
     parent = 0;
-    thisObject = Value::nullValue();
+    thisObject = eng->globalObject;
 
     function = 0;
     arguments = 0;
@@ -385,11 +385,18 @@ void ExecutionContext::initCallContext(ExecutionContext *parent, const Value tha
 
     engine = parent->engine;
     this->parent = parent;
-    thisObject = that;
 
     function = f;
     strictMode = f->strictMode;
 
+    thisObject = that;
+    if (!strictMode && !thisObject.isObject()) {
+        if (thisObject.isUndefined() || thisObject.isNull())
+            thisObject = engine->globalObject;
+        else
+            thisObject = thisObject.toObject(this);
+    }
+
     arguments = args;
     argumentCount = argc;
     if (function->needsActivation || argc < function->formalParameterCount){
diff --git a/qmljs_objects.cpp b/qmljs_objects.cpp
index d74a501..6e0af63 100644
--- a/qmljs_objects.cpp
+++ b/qmljs_objects.cpp
@@ -450,7 +450,7 @@ Value FunctionObject::construct(ExecutionContext *context, Value *args, int argc
 {
     ExecutionContext k;
     ExecutionContext *ctx = needsActivation ? context->engine->newContext() : &k;
-    ctx->initCallContext(context, Value::nullValue(), this, args, argc);
+    ctx->initCallContext(context, Value::undefinedValue(), this, args, argc);
     Value result = construct(ctx);
     ctx->wireUpPrototype();
     ctx->leaveCallContext();
@@ -464,12 +464,6 @@ Value FunctionObject::call(ExecutionContext *context, Value thisObject, Value *a
     ExecutionContext k;
     ExecutionContext *ctx = needsActivation ? context->engine->newContext() : &k;
 
-    if (!strictMode && !thisObject.isObject()) {
-        if (thisObject.isUndefined() || thisObject.isNull())
-            thisObject = context->engine->globalObject;
-        else
-            thisObject = __qmljs_to_object(thisObject, context);
-    }
     ctx->initCallContext(context, thisObject, this, args, argc);
     Value result = call(ctx);
     ctx->leaveCallContext();
diff --git a/qmljs_runtime.cpp b/qmljs_runtime.cpp
index 53f313f..62e7be4 100644
--- a/qmljs_runtime.cpp
+++ b/qmljs_runtime.cpp
@@ -628,9 +628,7 @@ Value __qmljs_get_activation_property(ExecutionContext *ctx, String *name)
 
 Value __qmljs_get_thisObject(ExecutionContext *ctx)
 {
-    if (ctx->thisObject.isObject())
-        return ctx->thisObject;
-    return ctx->engine->globalObject;
+    return ctx->thisObject;
 }
 
 uint __qmljs_equal(Value x, Value y, ExecutionContext *ctx)
diff --git a/qv4codegen.cpp b/qv4codegen.cpp
index eefd3a3..d9ac31d 100644
--- a/qv4codegen.cpp
+++ b/qv4codegen.cpp
@@ -207,7 +207,8 @@ protected:
     inline void enterEnvironment(Node *node)
     {
         Environment *e = _cg->newEnvironment(node, _env);
-        e->isStrict = _cg->_context->strictMode;
+        if (!e->isStrict)
+            e->isStrict = _cg->_context->strictMode;
         _envStack.append(e);
         _env = e;
     }
-- 
2.7.4