[clang] [HLSL] Resource initialization by constructors (PR #135120)

[Damyan Pepper via cfe-commits]

================
@@ -89,12 +89,51 @@ RESOURCE<float> Buffer;
 // CHECK-SAME{LITERAL}: [[hlsl::raw_buffer]]
 // CHECK-SAME{LITERAL}: [[hlsl::contained_type(element_type)]]
 
+// Default constructor
+
+// CHECK: CXXConstructorDecl {{.*}} [[RESOURCE]]<element_type> 'void ()' inline
+// CHECK-NEXT: CompoundStmt
+// CHECK-NEXT: BinaryOperator {{.*}} '='
+// CHECK-NEXT: MemberExpr {{.*}} lvalue .__handle
+// CHECK-NEXT: CXXThisExpr {{.*}} '[[RESOURCE]]<element_type>' lvalue implicit this
+// CHECK-NEXT: CallExpr {{.*}} '__hlsl_resource_t
+// CHECK-NEXT: ImplicitCastExpr {{.*}} <BuiltinFnToFnPtr>
+// CHECK-NEXT: DeclRefExpr {{.*}} '<builtin fn type>' Function {{.*}} '__builtin_hlsl_resource_createpoisonhandle'
+// CHECK-NEXT: MemberExpr {{.*}} lvalue .__handle
+// CHECK-NEXT: CXXThisExpr {{.*}} '[[RESOURCE]]<element_type>' lvalue implicit this
+// CHECK-NEXT: AlwaysInlineAttr
+
+// Constructor from binding
+
+// CHECK: CXXConstructorDecl {{.*}} [[RESOURCE]]<element_type> 'void (unsigned int, unsigned int, int, unsigned int)' inline
+// CHECK-NEXT: ParmVarDecl {{.*}} registerNo 'unsigned int'
+// CHECK-NEXT: ParmVarDecl {{.*}} spaceNo 'unsigned int'
+// CHECK-NEXT: ParmVarDecl {{.*}} range 'int'
+// CHECK-NEXT: ParmVarDecl {{.*}} index 'unsigned int'
+// CHECK-NEXT: CompoundStmt {{.*}}
+// CHECK-NEXT: BinaryOperator {{.*}} '='
+// CHECK-NEXT: MemberExpr {{.*}} lvalue .__handle
+// CHECK-NEXT: CXXThisExpr {{.*}} '[[RESOURCE]]<element_type>' lvalue implicit this
+// CHECK-NEXT: CallExpr {{.*}} '__hlsl_resource_t
+// CHECK-NEXT: ImplicitCastExpr {{.*}} <BuiltinFnToFnPtr>
+// CHECK-NEXT: DeclRefExpr {{.*}} '<builtin fn type>' Function {{.*}} '__builtin_hlsl_resource_createhandlefrombinding'
+// CHECK-NEXT: MemberExpr {{.*}} lvalue .__handle
+// CHECK-NEXT: CXXThisExpr {{.*}} '[[RESOURCE]]<element_type>' lvalue implicit this
+// CHECK-NEXT: DeclRefExpr {{.*}} 'unsigned int' ParmVar {{.*}} 'registerNo' 'unsigned int'
+// CHECK-NEXT: DeclRefExpr {{.*}} 'unsigned int' ParmVar {{.*}} 'spaceNo' 'unsigned int'
+// CHECK-NEXT: DeclRefExpr {{.*}} 'int' ParmVar {{.*}} 'range' 'int'
+// CHECK-NEXT: DeclRefExpr {{.*}} 'unsigned int' ParmVar {{.*}} 'index' 'unsigned int'
+// CHECK-NEXT: AlwaysInlineAttr
+
+// Subsctript operators
----------------
damyanp wrote:

```suggestion
// Subscript operators
```

https://github.com/llvm/llvm-project/pull/135120