#86dtbrzdm - Fix class instantiation causing stack error

boa3/internal/compiler/codegenerator/codegenerator.py

@@ -522,19 +522,25 @@ def get_symbol(self, identifier: str, scope: ISymbol | None = None, is_internal:
             return found_id, found_symbol
         return identifier, Type.none
 
-    def initialize_static_fields(self) -> bool:
+    def initialize_static_fields(self) -> tuple[bool, bool]:
         """
         Converts the signature of the method
 
-        :return: whether there are static fields to be initialized
+        :return: whether there are static fields to be initialized and if they can be generated already
         """
+        can_init_static_fields = False
+        has_static_fields = False
+        default_result = (has_static_fields, can_init_static_fields)
+
         if not self.can_init_static_fields:
-            return False
+            return default_result
         if self.initialized_static_fields:
-            return False
+            return default_result
 
         num_static_fields = len(self._statics)
-        if num_static_fields > 0:
+        has_static_fields = num_static_fields > 0
+        can_init_static_fields = True
+        if has_static_fields:
             init_data = bytearray([num_static_fields])
             self.__insert1(OpcodeInfo.INITSSLOT, init_data)
 
@@ -548,7 +554,7 @@ def initialize_static_fields(self) -> bool:
             init_method.init_bytecode = self.last_code
             self.symbol_table[constants.INITIALIZE_METHOD_ID] = init_method
 
-        return num_static_fields > 0
+        return has_static_fields, can_init_static_fields
 
     def end_initialize(self):
         """

boa3/internal/compiler/codegenerator/codegeneratorvisitor.py

@@ -205,7 +205,8 @@ def visit_Module(self, module: ast.Module) -> GeneratorData:
         for stmt in function_stmts:
             self.visit(stmt)
 
-        if self.generator.initialize_static_fields():
+        has_static_fields, can_initialize_static_fields = self.generator.initialize_static_fields()
+        if can_initialize_static_fields:
             last_symbols = self.symbols  # save to revert in the end and not compromise consequent visits
             class_non_static_stmts = []
 
@@ -243,23 +244,24 @@ def visit_Module(self, module: ast.Module) -> GeneratorData:
                         class_non_static_stmts.append(cls_fun)
                     self.symbols = last_symbols  # don't use inner scopes to evaluate the other globals
 
-            # to generate the 'initialize' method for Neo
-            self._log_info(f"Compiling '{constants.INITIALIZE_METHOD_ID}' function")
-            self._is_generating_initialize = True
-            for stmt in global_stmts:
-                cur_tree = self._tree
-                cur_filename = self.filename
-                if hasattr(stmt, 'origin'):
-                    if hasattr(stmt.origin, 'filename'):
-                        self.set_filename(stmt.origin.filename)
-                    self._tree = stmt.origin
-
-                self.visit(stmt)
-                self.filename = cur_filename
-                self._tree = cur_tree
-
-            self._is_generating_initialize = False
-            self.generator.end_initialize()
+            if has_static_fields:
+                # to generate the 'initialize' method for Neo
+                self._log_info(f"Compiling '{constants.INITIALIZE_METHOD_ID}' function")
+                self._is_generating_initialize = True
+                for stmt in global_stmts:
+                    cur_tree = self._tree
+                    cur_filename = self.filename
+                    if hasattr(stmt, 'origin'):
+                        if hasattr(stmt.origin, 'filename'):
+                            self.set_filename(stmt.origin.filename)
+                        self._tree = stmt.origin
+
+                    self.visit(stmt)
+                    self.filename = cur_filename
+                    self._tree = cur_tree
+
+                self._is_generating_initialize = False
+                self.generator.end_initialize()
 
             # generate any symbol inside classes that's not variables AFTER generating 'initialize' method
             for stmt in class_non_static_stmts:

boa3_test/test_sc/class_test/ClassInitWithStaticVariable.py

@@ -0,0 +1,27 @@
+from typing import Any
+
+from boa3.sc.compiletime import public
+
+FOO = "bar"
+
+
+class MyNFT:
+    def __init__(self, shape: str, color: str, background: str, size: str) -> None:
+        self.shape = shape
+        self.color = color
+        self.background = background
+        self.size = size
+
+    def export(self) -> dict:
+        return {
+            'shape': self.shape,
+            'color': self.color,
+            'background': self.background,
+            'size': self.size
+        }
+
+
+@public
+def test() -> Any:
+    nft = MyNFT('Rectangle', 'Blue', 'Black', 'Small')
+    return nft

boa3_test/tests/compiler_tests/test_class.py

@@ -489,3 +489,19 @@ async def test_return_dict_with_class_attributes(self):
         }
         result, _ = await self.call('test_pair', [], return_type=dict[str,str])
         self.assertEqual(expected_result, result)
+
+    async def test_class_init_with_static_variable_no_optimization(self):
+        await self.set_up_contract('ClassInitWithStaticVariable.py', optimize=False)
+        from boa3_test.test_sc.class_test.ClassInitWithStaticVariable import MyNFT
+
+        expected_result = MyNFT('Rectangle', 'Blue', 'Black', 'Small')
+        result, _ = await self.call('test', [], return_type=list)
+        self.assertObjectEqual(expected_result, result)
+
+    async def test_class_init_with_static_variable_optimized(self):
+        await self.set_up_contract('ClassInitWithStaticVariable.py', optimize=True)
+        from boa3_test.test_sc.class_test.ClassInitWithStaticVariable import MyNFT
+
+        expected_result = MyNFT('Rectangle', 'Blue', 'Black', 'Small')
+        result, _ = await self.call('test', [], return_type=list)
+        self.assertObjectEqual(expected_result, result)