Fix endianness in constant handling

When running on a big-endian system, we need to convert the constant values
into big-endian once and then it's possible to access them directly.

Change-Id: I655bad7b7734e3b95e79e5f688f0b4041d0c41c4
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/qml/compiler/qv4compileddata.cpp b/src/qml/compiler/qv4compileddata.cpp
index 121b5907db..b060d72448 100644
--- a/src/qml/compiler/qv4compileddata.cpp
+++ b/src/qml/compiler/qv4compileddata.cpp
@@ -161,6 +161,16 @@ QV4::Function *CompilationUnit::linkToEngine(ExecutionEngine *engine)
         }
     }
 
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+    Value *bigEndianConstants = new Value[data->constantTableSize];
+    const LEUInt64 *littleEndianConstants = data->constants();
+    for (uint i = 0; i < data->constantTableSize; ++i)
+        bigEndianConstants[i] = Value::fromReturnedValue(littleEndianConstants[i]);
+    constants = bigEndianConstants;
+#else
+    constants = reinterpret_cast<const Value*>(data->constants());
+#endif
+
     linkBackendToEngine(engine);
 
     if (data->indexOfRootFunction != -1)
@@ -203,6 +213,9 @@ void CompilationUnit::unlink()
     runtimeClasses = 0;
     qDeleteAll(runtimeFunctions);
     runtimeFunctions.clear();
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+    delete [] constants;
+#endif
 }
 
 void CompilationUnit::markObjects(QV4::ExecutionEngine *e)