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, 16 insertions, 0 deletions

diff --git a/source/slang/slang-ast-expr.h b/source/slang/slang-ast-expr.h
index 0a875fb50..da213e8d4 100644
--- a/source/slang/slang-ast-expr.h
+++ b/source/slang/slang-ast-expr.h
@@ -545,6 +545,22 @@ class PointerTypeExpr : public Expr
     TypeExp base;
 };
 
+    /// A type expression that represents a function type, e.g. (bool, int) -> float
+class FuncTypeExpr : public Expr
+{
+    SLANG_AST_CLASS(FuncTypeExpr);
+
+    List<TypeExp> parameters;
+    TypeExp result;
+};
+
+class TupleTypeExpr : public Expr
+{
+    SLANG_AST_CLASS(TupleTypeExpr);
+
+    List<TypeExp> members;
+};
+
     /// An expression that applies a generic to arguments for some,
     /// but not all, of its explicit parameters.
     ///