Introduce the wide/xwide instruction prefixes

And add proper decoding for the prefixed instructions to the
VME and bytecode dumper.

We still only generate XWide instructions, that will get fixed
in the next change.

Change-Id: I6d2dc6a0a4f706044038274ca79e019a6c9bb7d9
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 5 insertions, 4 deletions

diff --git a/src/qml/compiler/qv4bytecodegenerator.cpp b/src/qml/compiler/qv4bytecodegenerator.cpp
index 72c3d4e96f..3ce3acdb86 100644
--- a/src/qml/compiler/qv4bytecodegenerator.cpp
+++ b/src/qml/compiler/qv4bytecodegenerator.cpp
@@ -71,11 +71,12 @@ void BytecodeGenerator::compressInstructions()
 {
     for (auto &i : instructions) {
         Instr instr = i.instr;
-        i.packed[0] = static_cast<char>(i.type);
-        memcpy(i.packed + 1, reinterpret_cast<char *>(&instr), i.size);
-        ++i.size;
+        i.packed[0] = static_cast<char>(Instr::Type::XWide);
+        i.packed[1] = static_cast<char>(i.type);
+        memcpy(i.packed + 2, reinterpret_cast<char *>(&instr), i.size);
+        i.size += 2;
         if (i.offsetForJump != -1)
-            ++i.offsetForJump;
+            i.offsetForJump += 2;
     }
 }