MVP for higher order functions (#2849)

* MVP for higher order functions

* Add shader subgroup partitioned glsl intrinsics

* Implement parsing and checking for tuple types

Currently there is no way to do anything useful with them from the source language however

* neaten

* Correct precedence of function type parsing

* neaten

* higher order function tests

* function types of any arity

* Inference for higher order functions

* Add second test for unsynchronized params

* regenerate vs projects

* dx11 -> dx12 for saturated cooperations tests

* Disable saturated cooperation tests on vulkan

They fail on release builds in CI, not essential for the higher order function work however

* remove saturated-cooperation tests

* Remove unnecessary assert and clarify control flow in AddDeclRefOverloadCandidates

* Add Tuple type name mangling

* Use functype keyword to introduce function types

* Add more inference tests for hof

---------

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/source/slang/slang-check-impl.h b/source/slang/slang-check-impl.h
index 2a78fa999..efc3989e2 100644
--- a/source/slang/slang-check-impl.h
+++ b/source/slang/slang-check-impl.h
@@ -1528,7 +1528,7 @@ namespace Slang
             SourceLoc loc;
 
             // The original expression (if any) that triggered things
-            Expr* originalExpr = nullptr;
+            AppExprBase* originalExpr = nullptr;
 
             // Source location of the "function" part of the expression, if any
             SourceLoc       funcLoc;
@@ -1695,6 +1695,11 @@ namespace Slang
             FuncType*		/*funcType*/,
             OverloadResolveContext&	/*context*/);
 
+        void AddFuncExprOverloadCandidate(
+            FuncType* funcType,
+            OverloadResolveContext& context,
+            Expr* expr);
+
         // Add a candidate callee for overload resolution, based on
         // calling a particular `ConstructorDecl`.
         void AddCtorOverloadCandidate(
@@ -1966,6 +1971,8 @@ namespace Slang
         Expr* visitAndTypeExpr(AndTypeExpr* expr);
         Expr* visitPointerTypeExpr(PointerTypeExpr* expr);
         Expr* visitModifiedTypeExpr(ModifiedTypeExpr* expr);
+        Expr* visitFuncTypeExpr(FuncTypeExpr* expr);
+        Expr* visitTupleTypeExpr(TupleTypeExpr* expr);
 
         Expr* visitForwardDifferentiateExpr(ForwardDifferentiateExpr* expr);
         Expr* visitBackwardDifferentiateExpr(BackwardDifferentiateExpr* expr);