ast2 forward declaration support

nimterop/ast2.nim

@@ -252,6 +252,8 @@ proc newTypeIdent(nimState: NimState, node: TSNode, fname = "", union = false):
     result = newNode(nkTypeDef)
     result.add prident
     result.add newNode(nkEmpty)
+    
+    nimState.identifierNodes[name] = result
   else:
     necho &"# type '{origname}' is duplicate, skipped"
 
@@ -520,6 +522,24 @@ proc addTypeObject(nimState: NimState, node: TSNode, typeDef: PNode = nil, fname
     nimState.typeSection.add typeDef
 
     nimState.printDebug(typeDef)
+  else:
+    # Forward declaration case
+    let
+      fdlist = node.anyChildInTree("field_declaration_list")
+    if not fdlist.isNil and fdlist.len > 0:
+      # Current node has fields
+      let
+        name = nimState.getNodeVal(node.getAtom())
+
+      if nimState.identifierNodes.hasKey(name):
+        let
+          def = nimState.identifierNodes[name]
+        # Duplicate nkTypeDef for `name` with empty fields
+        if def.kind == nkTypeDef and def.len == 3 and
+          def[2].kind == nkObjectTy and def[2].len == 3 and
+          def[2][2].kind == nkEmpty:
+            # Add fields to existing object
+            def[2][2] = nimState.newRecListTree(name, fdlist)
 
 proc addTypeTyped(nimState: NimState, node: TSNode, ftname = "", offset = 0) =
   # Add a type of a specified type
@@ -1135,6 +1155,7 @@ proc printNim*(gState: State, fullpath: string, root: TSNode) =
     fp = fullpath.replace("\\", "/")
 
   nimState.identifiers = newTable[string, string]()
+  nimState.identifierNodes = newTable[string, PNode]()
 
   nimState.gState = gState
   nimState.currentHeader = getCurrentHeader(fullpath)

nimterop/globals.nim

@@ -69,6 +69,7 @@ type
     outputHandle*: File
 
   NimState {.used.} = ref object
+    # All symbols that have been declared so far indexed by nimName
     identifiers*: TableRef[string, string]
 
     # Legacy ast fields, remove when ast2 becomes default
@@ -83,6 +84,9 @@ type
       config*: ConfigRef
       graph*: ModuleGraph
 
+      # Craeted symbols to generated AST - forward declaration tracking
+      identifierNodes*: TableRef[string, PNode]
+
     gState*: State
 
     currentHeader*, impShort*, sourceFile*: string

tests/include/tast2.h

@@ -14,6 +14,11 @@ typedef int *A6;
 typedef A0 **A7;
 typedef void *A8;
 
+// Forward declaration
+struct A0 {
+  int f1;
+};
+
 typedef char *A9p[3]; //, A9[4];
 typedef char *A10[3][6];
 typedef char *(*A11)[3];
@@ -67,6 +72,11 @@ typedef int *A6;
 typedef A0 **A7;
 typedef void *A8;
 
+// Forward declaration
+struct A0 {
+  int f1;
+};
+
 typedef char *A9p[3]; //, A9[4];
 typedef char *A10[3][6];
 typedef char *(*A11)[3];

tests/tast2.nim

@@ -32,9 +32,9 @@ assert D == "hello"
 assert E == 'c'
 
 assert A0 is object
-testFields(A0)
+testFields(A0, {"f1": "cint"}.toTable())
 assert A1 is A0
-testFields(A1)
+testFields(A1, {"f1": "cint"}.toTable())
 assert A2 is object
 testFields(A2)
 assert A3 is object