GPU Foreach Parsing and Checking (#1482)

This PR introduces parsing and semantic checking for a GPU foreach loop
for heterogeneouis programming. A GPU foreach loop takes the form:
```
__GPU_FOREACH(renderer, gridDims, LAMBDA(uint3 dispatchThreadID) {
        kernelCall(args, ...); });
```

And will allow the host code to call into a kernel with the correct
renderer and grid dimensions. This commit also introduces a hack to
unify types in the heterogeneous hello world file, which will hopefully
be amended in the future.

Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/source/slang/slang-check-stmt.cpp b/source/slang/slang-check-stmt.cpp
index 2d01086f1..9a5aee15c 100644
--- a/source/slang/slang-check-stmt.cpp
+++ b/source/slang/slang-check-stmt.cpp
@@ -288,4 +288,13 @@ namespace Slang
         stmt->expression = CheckExpr(stmt->expression);
     }
 
+    void SemanticsStmtVisitor::visitGpuForeachStmt(GpuForeachStmt*stmt)
+    {
+        stmt->renderer = CheckExpr(stmt->renderer);
+        stmt->gridDims = CheckExpr(stmt->gridDims);
+        ensureDeclBase(stmt->dispatchThreadID, DeclCheckState::Checked);
+        WithOuterStmt subContext(this, stmt);
+        stmt->kernelCall = subContext.CheckExpr(stmt->kernelCall);
+        return;
+    }
 }