Initial support for resolving meta-property access for the scope and context objects at QML compile time

This avoids having to do a string lookup for ids and in the import cache at
run-time, before we can do a string hash lookup in the property cache. Instead
we resolve final properties in the context and scope object at compile time and
look them up at run-time using their index instead. The dependencies to these
properties are also tracked separately and recorded in the compiled data.

This is merely the initial patch. There's a lot left to do, such as having
specialized getter and setters for specific property types. Setters are missing
altogether right now and will fall back to name lookup.

Change-Id: If3cb4e7c9454ef4850a615f0935b311c9395b165
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 10 insertions, 4 deletions

diff --git a/src/qml/compiler/qv4compileddata_p.h b/src/qml/compiler/qv4compileddata_p.h
index 60a697e53e..1c0d72e521 100644
--- a/src/qml/compiler/qv4compileddata_p.h
+++ b/src/qml/compiler/qv4compileddata_p.h
@@ -235,7 +235,11 @@ struct Function
 
     // Qml Extensions Begin
     quint32 nDependingIdObjects;
-    quint32 dependingIdObjectsOffset;
+    quint32 dependingIdObjectsOffset; // Array of resolved ID objects
+    quint32 nDependingContextProperties;
+    quint32 dependingContextPropertiesOffset; // Array of int pairs (property index and notify index)
+    quint32 nDependingScopeProperties;
+    quint32 dependingScopePropertiesOffset; // Array of int pairs (property index and notify index)
     // Qml Extensions End
 
 //    quint32 formalsIndex[nFormals]
@@ -247,11 +251,13 @@ struct Function
     const quint32 *localsTable() const { return reinterpret_cast<const quint32 *>(reinterpret_cast<const char *>(this) + localsOffset); }
     const quint32 *lineNumberMapping() const { return reinterpret_cast<const quint32 *>(reinterpret_cast<const char *>(this) + lineNumberMappingOffset); }
     const quint32 *qmlIdObjectDependencyTable() const { return reinterpret_cast<const quint32 *>(reinterpret_cast<const char *>(this) + dependingIdObjectsOffset); }
+    const quint32 *qmlContextPropertiesDependencyTable() const { return reinterpret_cast<const quint32 *>(reinterpret_cast<const char *>(this) + dependingContextPropertiesOffset); }
+    const quint32 *qmlScopePropertiesDependencyTable() const { return reinterpret_cast<const quint32 *>(reinterpret_cast<const char *>(this) + dependingScopePropertiesOffset); }
 
-    inline bool hasQmlDependencies() const { return nDependingIdObjects; }
+    inline bool hasQmlDependencies() const { return nDependingIdObjects > 0 || nDependingContextProperties > 0 || nDependingScopeProperties > 0; }
 
-    static int calculateSize(int nFormals, int nLocals, int nInnerfunctions, int lineNumberMappings, int nIdObjectDependencies) {
-        return (sizeof(Function) + (nFormals + nLocals + nInnerfunctions + 2 * lineNumberMappings + nIdObjectDependencies) * sizeof(quint32) + 7) & ~0x7;
+    static int calculateSize(int nFormals, int nLocals, int nInnerfunctions, int lineNumberMappings, int nIdObjectDependencies, int nPropertyDependencies) {
+        return (sizeof(Function) + (nFormals + nLocals + nInnerfunctions + 2 * lineNumberMappings + nIdObjectDependencies + 2 * nPropertyDependencies) * sizeof(quint32) + 7) & ~0x7;
     }
 };