1 files changed, 21 insertions, 2 deletions
diff --git a/source/slang/slang-ast-expr.h b/source/slang/slang-ast-expr.h
index f2fae7ced..647eb37a4 100644
--- a/source/slang/slang-ast-expr.h
+++ b/source/slang/slang-ast-expr.h
@@ -7,8 +7,13 @@
 namespace Slang {
 
 // Syntax class definitions for expressions.
-
-// Base class for expressions that will reference declarations
+// 
+    // A placeholder for where an Expr is expected but is missing from source.
+class IncompleteExpr : public Expr
+{
+    SLANG_AST_CLASS(IncompleteExpr)
+};
+    // Base class for expressions that will reference declarations
 class DeclRefExpr: public Expr
 {
     SLANG_ABSTRACT_AST_CLASS(DeclRefExpr)
@@ -20,6 +25,9 @@ class DeclRefExpr: public Expr
     // The name of the symbol being referenced
     Name* name = nullptr;
 
+    // The original expr before DeclRef resolution.
+    Expr* originalExpr = nullptr;
+
     SLANG_UNREFLECTED
     // The scope in which to perform lookup
     Scope* scope = nullptr;
@@ -137,6 +145,13 @@ class AppExprBase : public ExprWithArgsBase
     SLANG_ABSTRACT_AST_CLASS(AppExprBase)
 
     Expr* functionExpr = nullptr;
+
+    // The original function expr before overload resolution.
+    Expr* originalFunctionExpr = nullptr;
+
+    // The source location of `(`, `)`, and `,` that marks the start/end of the application op and
+    // each argument expr. This info is used by language server.
+    List<SourceLoc> argumentDelimeterLocs;
 };
 
 class InvokeExpr: public AppExprBase
@@ -196,6 +211,7 @@ class MemberExpr: public DeclRefExpr
 {
     SLANG_AST_CLASS(MemberExpr)
     Expr* baseExpression = nullptr;
+    SourceLoc memberOperatorLoc;
 };
 
 // Member looked up on a type, rather than a value
@@ -203,6 +219,7 @@ class StaticMemberExpr: public DeclRefExpr
 {
     SLANG_AST_CLASS(StaticMemberExpr)
     Expr* baseExpression = nullptr;
+    SourceLoc memberOperatorLoc;
 };
 
 struct MatrixCoord
@@ -220,6 +237,7 @@ class MatrixSwizzleExpr : public Expr
     Expr* base = nullptr;
     int elementCount;
     MatrixCoord elementCoords[4];
+    SourceLoc memberOpLoc;
 };
 
 class SwizzleExpr: public Expr
@@ -228,6 +246,7 @@ class SwizzleExpr: public Expr
     Expr* base = nullptr;
     int elementCount;
     int elementIndices[4];
+    SourceLoc memberOpLoc;
 };
 
 // A dereference of a pointer or pointer-like type