[CBP] Pointer frontend changes + groupshared pointer support (#7848)

Resolves #7628
Resolves: #8197

Primary Goals:
1. Add `Access` to pointer
2. AddressSpace::GroupShared support for pointers (SPIR-V)
3. Add `__getAddress()` to replace `&`
* `&` is not updated to `require(cpu)` since slangpy uses `&`. This
means we must: (1) merge PR; (2) replace `&` with `__getAddress()`; (3)
add `require(cpu)` to `&`

Changes:
* Added to `Ptr` the `Access` generic argument & logic (for
`Access::Read`).
* Moved the generic argument `AddressSpace` from `Ptr` to the end of the
type.
* Added pointer casting support between any `Ptr` as long as the
`AddressSpace` is the same
* Disallow globallycoherent T* and coherent T*
* Disallow const T*, T const*, and const T*
* Fixed .natvis display of `ConstantValue` `ValOperandNode`
* Support generic resolution of type-casted integers
* Added `VariablePointer` emitting for spirv + other minor logic needed
for groupshared pointers

Breaking Changes:
* Anyone using the `AddressSpace` of `Ptr` will now have to account for
the `Access` argument
* we disallow various syntax paired with `Ptr` and `T*`

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/source/slang/slang-parser.cpp b/source/slang/slang-parser.cpp
index 1302975df..e71b6162c 100644
--- a/source/slang/slang-parser.cpp
+++ b/source/slang/slang-parser.cpp
@@ -7026,7 +7026,6 @@ static NodeBase* parseSizeOfExpr(Parser* parser, void* /*userData*/)
 
 static NodeBase* parseAlignOfExpr(Parser* parser, void* /*userData*/)
 {
-    // We could have a type or a variable or an expression
     AlignOfExpr* alignOfExpr = parser->astBuilder->create<AlignOfExpr>();
 
     parser->ReadMatchingToken(TokenType::LParent);
@@ -7058,6 +7057,17 @@ static NodeBase* parseCountOfExpr(Parser* parser, void* /*userData*/)
     return countOfExpr;
 }
 
+static NodeBase* parseAddressOfExpr(Parser* parser, void* /*userData*/)
+{
+    // We could have a type or a variable or an expression
+    AddressOfExpr* addressOfExpr = parser->astBuilder->create<AddressOfExpr>();
+
+    parser->ReadMatchingToken(TokenType::LParent);
+    addressOfExpr->arg = parser->ParseExpression();
+    parser->ReadMatchingToken(TokenType::RParent);
+    return addressOfExpr;
+}
+
 static NodeBase* parseTryExpr(Parser* parser, void* /*userData*/)
 {
     auto tryExpr = parser->astBuilder->create<TryExpr>();
@@ -9648,6 +9658,7 @@ static const SyntaxParseInfo g_parseSyntaxEntries[] = {
     _makeParseExpr("sizeof", parseSizeOfExpr),
     _makeParseExpr("alignof", parseAlignOfExpr),
     _makeParseExpr("countof", parseCountOfExpr),
+    _makeParseExpr("__getAddress", parseAddressOfExpr),
 };
 
 ConstArrayView<SyntaxParseInfo> getSyntaxParseInfos()