[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, 40 insertions, 0 deletions

diff --git a/tests/language-feature/pointer/const-ptr-variations.slang b/tests/language-feature/pointer/const-ptr-variations.slang
new file mode 100644
index 000000000..a2619d6c4
--- /dev/null
+++ b/tests/language-feature/pointer/const-ptr-variations.slang
@@ -0,0 +1,40 @@
+//TEST:SIMPLE(filecheck=CHECK_1):-stage compute -entry computeMain -target spirv -DT1
+//TEST:SIMPLE(filecheck=CHECK_2):-stage compute -entry computeMain -target spirv -DT2
+//TEST:SIMPLE(filecheck=CHECK_3):-stage compute -entry computeMain -target spirv -DT3
+//TEST:SIMPLE(filecheck=CHECK_4):-stage compute -entry computeMain -target spirv -DT4
+
+// Tests for invalid use of `const` with Ptr/T*
+// Due to bad syntax breaking the parser, it is more robust to use disjoint tests with
+// #define's.
+cbuffer Globals
+{
+    int* ptr;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int id : SV_DispatchThreadID)
+{
+    // disallowed syntax with modifier `const`
+#ifdef T1
+    // CHECK_1: ([[# @LINE+1]]): error
+    int const* ptr1 = ptr;
+#endif
+
+#ifdef T2
+    // CHECK_2: ([[# @LINE+1]]): error
+    int* const ptr2 = ptr;
+#endif
+
+#ifdef T3
+    // CHECK_3: ([[# @LINE+1]]): error 20017
+    const int* ptr3 = ptr;
+    // CHECK_3: ([[# @LINE+1]]): error 20018
+    Ptr<const int> ptr4 = ptr;
+#endif
+
+#ifdef T4
+    // CHECK_4: OpEntryPoint
+    // CHECK_4-NOT: error
+    const Ptr<int> ptr5 = ptr;
+#endif
+}
\ No newline at end of file