Avoid exception checks after calls to some run-time functions

We know that some run-time functions won't thrown an exception, so this
patch annotates them with a tricked NoThrowContext* instead of
ExecutionContext*, which allows the masm isel to detect calls to them
and avoid generating the exception handling checks after the call.

Change-Id: Ida1c9497edda14f26e1d6389b0144f6abeeba654
Reviewed-by: Lars Knoll <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/qml/compiler/qv4isel_masm_p.h b/src/qml/compiler/qv4isel_masm_p.h
index b55192aae7..bf01d0429d 100644
--- a/src/qml/compiler/qv4isel_masm_p.h
+++ b/src/qml/compiler/qv4isel_masm_p.h
@@ -104,6 +104,22 @@ template <typename A>
 struct ExceptionCheck<QV4::ExecutionContext *(*)(QV4::ExecutionContext *, A)> {
     enum { NeedsCheck = 0 };
 };
+template <>
+struct ExceptionCheck<QV4::ReturnedValue (*)(QV4::NoThrowContext *)> {
+    enum { NeedsCheck = 0 };
+};
+template <typename A>
+struct ExceptionCheck<QV4::ReturnedValue (*)(QV4::NoThrowContext *, A)> {
+    enum { NeedsCheck = 0 };
+};
+template <typename A, typename B>
+struct ExceptionCheck<QV4::ReturnedValue (*)(QV4::NoThrowContext *, A, B)> {
+    enum { NeedsCheck = 0 };
+};
+template <typename A, typename B, typename C>
+struct ExceptionCheck<void (*)(QV4::NoThrowContext *, A, B, C)> {
+    enum { NeedsCheck = 0 };
+};
 
 class Assembler : public JSC::MacroAssembler
 {