ES7: Detect Tail Position Calls and pass that to the runtime

Doing the tail call in the runtime will come in a follow-up patch

Change-Id: I8224aac0edbdc765ee9b97703948edd52fd33f3e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

2 files changed, 14 insertions, 0 deletions

diff --git a/src/qml/jit/qv4baselinejit.cpp b/src/qml/jit/qv4baselinejit.cpp
index 7b4f2b00e7..70d1672689 100644
--- a/src/qml/jit/qv4baselinejit.cpp
+++ b/src/qml/jit/qv4baselinejit.cpp
@@ -552,6 +552,19 @@ void BaselineJIT::generate_CallWithSpread(int func, int thisObject, int argc, in
     as->checkException();
 }
 
+void BaselineJIT::generate_TailCall(int func, int thisObject, int argc, int argv)
+{
+    STORE_IP();
+    as->prepareCallWithArgCount(5);
+    as->passInt32AsArg(argc, 4);
+    as->passJSSlotAsArg(argv, 3);
+    as->passJSSlotAsArg(thisObject, 2);
+    as->passJSSlotAsArg(func, 1);
+    as->passEngineAsArg(0);
+    BASELINEJIT_GENERATE_RUNTIME_CALL(Runtime::method_tailCall, CallResultDestination::InAccumulator);
+    as->checkException();
+}
+
 
 void BaselineJIT::generate_Construct(int func, int argc, int argv)
 {
diff --git a/src/qml/jit/qv4baselinejit_p.h b/src/qml/jit/qv4baselinejit_p.h
index d4c1b074f6..47ad274d23 100644
--- a/src/qml/jit/qv4baselinejit_p.h
+++ b/src/qml/jit/qv4baselinejit_p.h
@@ -131,6 +131,7 @@ public:
     void generate_CallScopeObjectProperty(int propIdx, int base, int argc, int argv) override;
     void generate_CallContextObjectProperty(int propIdx, int base, int argc, int argv) override;
     void generate_CallWithSpread(int func, int thisObject, int argc, int argv) override;
+    void generate_TailCall(int func, int thisObject, int argc, int argv) override;
     void generate_Construct(int func, int argc, int argv) override;
     void generate_ConstructWithSpread(int func, int argc, int argv) override;
     void generate_SetUnwindHandler(int offset) override;