================
@@ -290,3 +294,295 @@ void SemaHLSL::DiagnoseAttrStageMismatch(
<< A << HLSLShaderAttr::ConvertShaderTypeToStr(Stage)
<< (AllowedStages.size() != 1) << join(StageStrings, ", ");
}
+
+namespace {
+
+/// This class implements HLSL availability diagnostics for default
+/// and relaxed mode
+///
+/// The goal of this diagnostic is to emit an error or warning when an
+/// unavailable API is found in a code that is reachable from the shader
+/// entry function or from an exported function (when compiling shader
+/// library).
+///
+/// This is done by traversing the AST of all shader entry point functions
+/// and of all exported functions, and any functions that are refrenced
+/// from this AST. In other words, any function that are reachable from
+/// the entry points.
+class DiagnoseHLSLAvailability
+ : public RecursiveASTVisitor<DiagnoseHLSLAvailability> {
+
+ Sema &SemaRef;
+
+ // Stack of functions to be scaned
+ llvm::SmallVector<const FunctionDecl *, 8> DeclsToScan;
+
+ // List of functions that were already scanned and in which environment.
+ //
+ // Maps FunctionDecl to a unsigned number that represents a set of shader
----------------
damyanp wrote:
```suggestion
// Tracks which environments functions have been scanned in.
//
// Maps FunctionDecl to an unsigned number that represents the set of shader
```
Note that there is a case where a FunctionDecl can be mapped to "0", indicating
that it hasn't been scanned in any environments.
https://github.com/llvm/llvm-project/pull/92704
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