TODO.md

@@ -2,3 +2,4 @@
 
 - Implement foldl for bytes
 - Implement a trace() builtin for debugging
+- Implement a proper type matching / checking system

phasm/compiler.py

@@ -1,17 +1,14 @@
 """
 This module contains the code to convert parsed Ourlang into WebAssembly code
 """
-from typing import Generator
-
+from . import codestyle
 from . import ourlang
 from . import typing
 from . import wasm
 
 from .stdlib import alloc as stdlib_alloc
 from .stdlib import types as stdlib_types
-from .wasmeasy import i32, i64
-
-Statements = Generator[wasm.Statement, None, None]
+from .wasmgenerator import Generator as WasmGenerator
 
 LOAD_STORE_TYPE_MAP = {
     typing.TypeUInt8: 'i32',
@@ -115,123 +112,123 @@ I64_OPERATOR_MAP = {
     '>=': 'ge_s',
 }
 
-def expression(inp: ourlang.Expression) -> Statements:
+def expression(wgn: WasmGenerator, inp: ourlang.Expression) -> None:
     """
     Compile: Any expression
     """
     if isinstance(inp, ourlang.ConstantUInt8):
-        yield i32.const(inp.value)
+        wgn.i32.const(inp.value)
         return
 
     if isinstance(inp, ourlang.ConstantUInt32):
-        yield i32.const(inp.value)
+        wgn.i32.const(inp.value)
         return
 
     if isinstance(inp, ourlang.ConstantUInt64):
-        yield i64.const(inp.value)
+        wgn.i64.const(inp.value)
         return
 
     if isinstance(inp, ourlang.ConstantInt32):
-        yield i32.const(inp.value)
+        wgn.i32.const(inp.value)
         return
 
     if isinstance(inp, ourlang.ConstantInt64):
-        yield i64.const(inp.value)
+        wgn.i64.const(inp.value)
         return
 
     if isinstance(inp, ourlang.ConstantFloat32):
-        yield wasm.Statement('f32.const', str(inp.value))
+        wgn.f32.const(inp.value)
         return
 
     if isinstance(inp, ourlang.ConstantFloat64):
-        yield wasm.Statement('f64.const', str(inp.value))
+        wgn.f64.const(inp.value)
         return
 
     if isinstance(inp, ourlang.VariableReference):
-        yield wasm.Statement('local.get', '${}'.format(inp.name))
+        wgn.add_statement('local.get', '${}'.format(inp.name))
         return
 
     if isinstance(inp, ourlang.BinaryOp):
-        yield from expression(inp.left)
-        yield from expression(inp.right)
+        expression(wgn, inp.left)
+        expression(wgn, inp.right)
 
         if isinstance(inp.type, typing.TypeUInt8):
             if operator := U8_OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i32.{operator}')
+                wgn.add_statement(f'i32.{operator}')
                 return
         if isinstance(inp.type, typing.TypeUInt32):
             if operator := OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i32.{operator}')
+                wgn.add_statement(f'i32.{operator}')
                 return
             if operator := U32_OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i32.{operator}')
+                wgn.add_statement(f'i32.{operator}')
                 return
         if isinstance(inp.type, typing.TypeUInt64):
             if operator := OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i64.{operator}')
+                wgn.add_statement(f'i64.{operator}')
                 return
             if operator := U64_OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i64.{operator}')
+                wgn.add_statement(f'i64.{operator}')
                 return
         if isinstance(inp.type, typing.TypeInt32):
             if operator := OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i32.{operator}')
+                wgn.add_statement(f'i32.{operator}')
                 return
             if operator := I32_OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i32.{operator}')
+                wgn.add_statement(f'i32.{operator}')
                 return
         if isinstance(inp.type, typing.TypeInt64):
             if operator := OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i64.{operator}')
+                wgn.add_statement(f'i64.{operator}')
                 return
             if operator := I64_OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'i64.{operator}')
+                wgn.add_statement(f'i64.{operator}')
                 return
         if isinstance(inp.type, typing.TypeFloat32):
             if operator := OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'f32.{operator}')
+                wgn.add_statement(f'f32.{operator}')
                 return
         if isinstance(inp.type, typing.TypeFloat64):
             if operator := OPERATOR_MAP.get(inp.operator, None):
-                yield wasm.Statement(f'f64.{operator}')
+                wgn.add_statement(f'f64.{operator}')
                 return
 
         raise NotImplementedError(expression, inp.type, inp.operator)
 
     if isinstance(inp, ourlang.UnaryOp):
-        yield from expression(inp.right)
+        expression(wgn, inp.right)
 
         if isinstance(inp.type, typing.TypeFloat32):
             if inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS:
-                yield wasm.Statement(f'f32.{inp.operator}')
+                wgn.add_statement(f'f32.{inp.operator}')
                 return
         if isinstance(inp.type, typing.TypeFloat64):
             if inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS:
-                yield wasm.Statement(f'f64.{inp.operator}')
+                wgn.add_statement(f'f64.{inp.operator}')
                 return
 
         if isinstance(inp.type, typing.TypeInt32):
             if inp.operator == 'len':
                 if isinstance(inp.right.type, typing.TypeBytes):
-                    yield i32.load()
+                    wgn.i32.load()
                     return
 
         raise NotImplementedError(expression, inp.type, inp.operator)
 
     if isinstance(inp, ourlang.FunctionCall):
         for arg in inp.arguments:
-            yield from expression(arg)
+            expression(wgn, arg)
 
-        yield wasm.Statement('call', '${}'.format(inp.function.name))
+        wgn.add_statement('call', '${}'.format(inp.function.name))
         return
 
     if isinstance(inp, ourlang.AccessBytesIndex):
         if not isinstance(inp.type, typing.TypeUInt8):
             raise NotImplementedError(inp, inp.type)
 
-        yield from expression(inp.varref)
-        yield from expression(inp.index)
-        yield wasm.Statement('call', '$stdlib.types.__subscript_bytes__')
+        expression(wgn, inp.varref)
+        expression(wgn, inp.index)
+        wgn.call(stdlib_types.__subscript_bytes__)
         return
 
     if isinstance(inp, ourlang.AccessStructMember):
@@ -241,8 +238,8 @@ def expression(inp: ourlang.Expression) -> Statements:
             # as members of struct or tuples
             raise NotImplementedError(expression, inp, inp.member)
 
-        yield from expression(inp.varref)
-        yield wasm.Statement(f'{mtyp}.load', 'offset=' + str(inp.member.offset))
+        expression(wgn, inp.varref)
+        wgn.add_statement(f'{mtyp}.load', 'offset=' + str(inp.member.offset))
         return
 
     if isinstance(inp, ourlang.AccessTupleMember):
@@ -252,47 +249,62 @@ def expression(inp: ourlang.Expression) -> Statements:
             # as members of struct or tuples
             raise NotImplementedError(expression, inp, inp.member)
 
-        yield from expression(inp.varref)
-        yield wasm.Statement(f'{mtyp}.load', 'offset=' + str(inp.member.offset))
+        expression(wgn, inp.varref)
+        wgn.add_statement(f'{mtyp}.load', 'offset=' + str(inp.member.offset))
+        return
+
+    if isinstance(inp, ourlang.Fold):
+        mtyp = LOAD_STORE_TYPE_MAP.get(inp.base.type.__class__)
+        if mtyp is None:
+            # In the future might extend this by having structs or tuples
+            # as members of struct or tuples
+            raise NotImplementedError(expression, inp, inp.base)
+
+        if inp.iter.type.__class__.__name__ != 'TypeBytes':
+            raise NotImplementedError(expression, inp, inp.iter.type)
+
+        tmp_var = wgn.temp_var_u8(f'fold_{codestyle.type_(inp.type)}')
+        expression(wgn, inp.base)
+        wgn.local.set(tmp_var)
+
+        # FIXME: Do a loop
+        wgn.unreachable(comment='Not implemented yet')
         return
 
     raise NotImplementedError(expression, inp)
 
-def statement_return(inp: ourlang.StatementReturn) -> Statements:
+def statement_return(wgn: WasmGenerator, inp: ourlang.StatementReturn) -> None:
     """
     Compile: Return statement
     """
-    yield from expression(inp.value)
-    yield wasm.Statement('return')
+    expression(wgn, inp.value)
+    wgn.return_()
 
-def statement_if(inp: ourlang.StatementIf) -> Statements:
+def statement_if(wgn: WasmGenerator, inp: ourlang.StatementIf) -> None:
     """
     Compile: If statement
     """
-    yield from expression(inp.test)
-
-    yield wasm.Statement('if')
-
+    expression(wgn, inp.test)
+    with wgn.if_():
         for stat in inp.statements:
-        yield from statement(stat)
+            statement(wgn, stat)
 
         if inp.else_statements:
-        yield wasm.Statement('else')
-        for stat in inp.else_statements:
-            yield from statement(stat)
+            raise NotImplementedError
+            # yield wasm.Statement('else')
+            # for stat in inp.else_statements:
+            #     statement(wgn, stat)
 
-    yield wasm.Statement('end')
-
-def statement(inp: ourlang.Statement) -> Statements:
+def statement(wgn: WasmGenerator, inp: ourlang.Statement) -> None:
     """
     Compile: any statement
     """
     if isinstance(inp, ourlang.StatementReturn):
-        yield from statement_return(inp)
+        statement_return(wgn, inp)
         return
 
     if isinstance(inp, ourlang.StatementIf):
-        yield from statement_if(inp)
+        statement_if(wgn, inp)
         return
 
     if isinstance(inp, ourlang.StatementPass):
@@ -329,27 +341,15 @@ def function(inp: ourlang.Function) -> wasm.Function:
     """
     assert not inp.imported
 
+    wgn = WasmGenerator()
+
     if isinstance(inp, ourlang.TupleConstructor):
-        statements = [
-            *_generate_tuple_constructor(inp)
-        ]
-        locals_ = [
-            ('___new_reference___addr', wasm.WasmTypeInt32(), ),
-        ]
+        _generate_tuple_constructor(wgn, inp)
     elif isinstance(inp, ourlang.StructConstructor):
-        statements = [
-            *_generate_struct_constructor(inp)
-        ]
-        locals_ = [
-            ('___new_reference___addr', wasm.WasmTypeInt32(), ),
-        ]
+        _generate_struct_constructor(wgn, inp)
     else:
-        statements = [
-            x
-            for y in inp.statements
-            for x in statement(y)
-        ]
-        locals_ = [] # FIXME: Implement function locals, if required
+        for stat in inp.statements:
+            statement(wgn, stat)
 
     return wasm.Function(
         inp.name,
@@ -358,9 +358,12 @@ def function(inp: ourlang.Function) -> wasm.Function:
             function_argument(x)
             for x in inp.posonlyargs
         ],
-        locals_,
+        [
+            (k, v.wasm_type(), )
+            for k, v in wgn.locals.items()
+        ],
         type_(inp.returns),
-        statements
+        wgn.statements
     )
 
 def module(inp: ourlang.Module) -> wasm.Module:
@@ -389,12 +392,15 @@ def module(inp: ourlang.Module) -> wasm.Module:
 
     return result
 
-def _generate_tuple_constructor(inp: ourlang.TupleConstructor) -> Statements:
-    yield wasm.Statement('i32.const', str(inp.tuple.alloc_size()))
-    yield wasm.Statement('call', '$stdlib.alloc.__alloc__')
+def _generate_tuple_constructor(wgn: WasmGenerator, inp: ourlang.TupleConstructor) -> None:
+    tmp_var = wgn.temp_var_i32('tuple_adr')
 
-    yield wasm.Statement('local.set', '$___new_reference___addr')
+    # Allocated the required amounts of bytes in memory
+    wgn.i32.const(inp.tuple.alloc_size())
+    wgn.call(stdlib_alloc.__alloc__)
+    wgn.local.set(tmp_var)
 
+    # Store each member individually
     for member in inp.tuple.members:
         mtyp = LOAD_STORE_TYPE_MAP.get(member.type.__class__)
         if mtyp is None:
@@ -402,18 +408,22 @@ def _generate_tuple_constructor(inp: ourlang.TupleConstructor) -> Statements:
             # as members of struct or tuples
             raise NotImplementedError(expression, inp, member)
 
-        yield wasm.Statement('local.get', '$___new_reference___addr')
-        yield wasm.Statement('local.get', f'$arg{member.idx}')
-        yield wasm.Statement(f'{mtyp}.store', 'offset=' + str(member.offset))
+        wgn.local.get(tmp_var)
+        wgn.add_statement('local.get', f'$arg{member.idx}')
+        wgn.add_statement(f'{mtyp}.store', 'offset=' + str(member.offset))
 
-    yield wasm.Statement('local.get', '$___new_reference___addr')
+    # Return the allocated address
+    wgn.local.get(tmp_var)
 
-def _generate_struct_constructor(inp: ourlang.StructConstructor) -> Statements:
-    yield wasm.Statement('i32.const', str(inp.struct.alloc_size()))
-    yield wasm.Statement('call', '$stdlib.alloc.__alloc__')
+def _generate_struct_constructor(wgn: WasmGenerator, inp: ourlang.StructConstructor) -> None:
+    tmp_var = wgn.temp_var_i32('tuple_adr')
 
-    yield wasm.Statement('local.set', '$___new_reference___addr')
+    # Allocated the required amounts of bytes in memory
+    wgn.i32.const(inp.struct.alloc_size())
+    wgn.call(stdlib_alloc.__alloc__)
+    wgn.local.set(tmp_var)
 
+    # Store each member individually
     for member in inp.struct.members:
         mtyp = LOAD_STORE_TYPE_MAP.get(member.type.__class__)
         if mtyp is None:
@@ -421,8 +431,9 @@ def _generate_struct_constructor(inp: ourlang.StructConstructor) -> Statements:
             # as members of struct or tuples
             raise NotImplementedError(expression, inp, member)
 
-        yield wasm.Statement('local.get', '$___new_reference___addr')
-        yield wasm.Statement('local.get', f'${member.name}')
-        yield wasm.Statement(f'{mtyp}.store', 'offset=' + str(member.offset))
+        wgn.local.get(tmp_var)
+        wgn.add_statement('local.get', f'${member.name}')
+        wgn.add_statement(f'{mtyp}.store', 'offset=' + str(member.offset))
 
-    yield wasm.Statement('local.get', '$___new_reference___addr')
+    # Return the allocated address
+    wgn.local.get(tmp_var)

phasm/ourlang.py

@@ -3,6 +3,8 @@ Contains the syntax tree for ourlang
 """
 from typing import Dict, List, Tuple
 
+import enum
+
 from typing_extensions import Final
 
 WEBASSEMBLY_BUILDIN_FLOAT_OPS: Final = ('abs', 'sqrt', 'ceil', 'floor', 'trunc', 'nearest', )
@@ -225,6 +227,37 @@ class AccessTupleMember(Expression):
         self.varref = varref
         self.member = member
 
+class Fold(Expression):
+    """
+    A (left or right) fold
+    """
+    class Direction(enum.Enum):
+        """
+        Which direction to fold in
+        """
+        LEFT = 0
+        RIGHT = 1
+
+    dir: Direction
+    func: 'Function'
+    base: Expression
+    iter: Expression
+
+    def __init__(
+            self,
+            type_: TypeBase,
+            dir_: Direction,
+            func: 'Function',
+            base: Expression,
+            iter_: Expression,
+        ) -> None:
+        super().__init__(type_)
+
+        self.dir = dir_
+        self.func = func
+        self.base = base
+        self.iter = iter_
+
 class Statement:
     """
     A statement within a function

phasm/parser.py

@@ -38,6 +38,8 @@ from .ourlang import (
     StructConstructor, TupleConstructor,
     UnaryOp, VariableReference,
 
+    Fold,
+
     Statement,
     StatementIf, StatementPass, StatementReturn,
 )
@@ -348,7 +350,7 @@ class OurVisitor:
 
         raise NotImplementedError(f'{node} as expr in FunctionDef')
 
-    def visit_Module_FunctionDef_Call(self, module: Module, function: Function, our_locals: OurLocals, exp_type: TypeBase, node: ast.Call) -> Union[FunctionCall, UnaryOp]:
+    def visit_Module_FunctionDef_Call(self, module: Module, function: Function, our_locals: OurLocals, exp_type: TypeBase, node: ast.Call) -> Union[Fold, FunctionCall, UnaryOp]:
         if node.keywords:
             _raise_static_error(node, 'Keyword calling not supported') # Yet?
 
@@ -386,6 +388,37 @@ class OurVisitor:
                 'len',
                 self.visit_Module_FunctionDef_expr(module, function, our_locals, module.types['bytes'], node.args[0]),
             )
+        elif node.func.id == 'foldl':
+            # TODO: This should a much more generic function!
+            # For development purposes, we're assuming you're doing a foldl(Callable[[u8, u8], u8], u8, bytes)
+            # In the future, we should probably infer the type of the second argument,
+            # and use it as expected types for the other u8s and the Iterable[u8] (i.e. bytes)
+
+            if not isinstance(exp_type, TypeUInt8):
+                _raise_static_error(node, f'Cannot make {node.func.id} result in {exp_type} - not implemented yet')
+
+            if 3 != len(node.args):
+                _raise_static_error(node, f'Function {node.func.id} requires 3 arguments but {len(node.args)} are given')
+
+            t_u8 = module.types['u8']
+
+            # TODO: This is not generic
+            subnode = node.args[0]
+            if not isinstance(subnode, ast.Name):
+                raise NotImplementedError(f'Calling methods that are not a name {subnode}')
+            if not isinstance(subnode.ctx, ast.Load):
+                _raise_static_error(subnode, 'Must be load context')
+            if subnode.id not in module.functions:
+                _raise_static_error(subnode, 'Reference to undefined function')
+            func = module.functions[subnode.id]
+
+            return Fold(
+                exp_type,
+                Fold.Direction.LEFT,
+                func,
+                self.visit_Module_FunctionDef_expr(module, function, our_locals, t_u8, node.args[1]),
+                self.visit_Module_FunctionDef_expr(module, function, our_locals, module.types['bytes'], node.args[2]),
+            )
         else:
             if node.func.id not in module.functions:
                 _raise_static_error(node, 'Call to undefined function')

phasm/typing.py

@@ -127,7 +127,7 @@ class TypeTuple(TypeBase):
         """
         Generates an internal name for this tuple
         """
-        mems = '@'.join('?' for x in self.members)
+        mems = '@'.join('?' for x in self.members) # FIXME: Should not be a questionmark
         assert ' ' not in mems, 'Not implement yet: subtuples'
         return f'tuple@{mems}'
 

phasm/wasmgenerator.py

@@ -16,29 +16,70 @@ class VarType_Base:
         self.name = name
         self.name_ref = f'${name}'
 
+class VarType_u8(VarType_Base):
+    wasm_type = wasm.WasmTypeInt32
+
 class VarType_i32(VarType_Base):
     wasm_type = wasm.WasmTypeInt32
 
-class Generator_i32:
-    def __init__(self, generator: 'Generator') -> None:
+class Generator_i32i64:
+    def __init__(self, prefix: str, generator: 'Generator') -> None:
+        self.prefix = prefix
         self.generator = generator
 
         # 2.4.1. Numeric Instructions
         # ibinop
-        self.add = functools.partial(self.generator.add, 'i32.add')
+        self.add = functools.partial(self.generator.add_statement, f'{prefix}.add')
 
         # irelop
-        self.eq = functools.partial(self.generator.add, 'i32.eq')
-        self.ne = functools.partial(self.generator.add, 'i32.ne')
-        self.lt_u = functools.partial(self.generator.add, 'i32.lt_u')
+        self.eq = functools.partial(self.generator.add_statement, f'{prefix}.eq')
+        self.ne = functools.partial(self.generator.add_statement, f'{prefix}.ne')
+        self.lt_u = functools.partial(self.generator.add_statement, f'{prefix}.lt_u')
 
         # 2.4.4. Memory Instructions
-        self.load = functools.partial(self.generator.add, 'i32.load')
-        self.load8_u = functools.partial(self.generator.add, 'i32.load8_u')
-        self.store = functools.partial(self.generator.add, 'i32.store')
+        self.load = functools.partial(self.generator.add_statement, f'{prefix}.load')
+        self.load8_u = functools.partial(self.generator.add_statement, f'{prefix}.load8_u')
+        self.store = functools.partial(self.generator.add_statement, f'{prefix}.store')
 
     def const(self, value: int, comment: Optional[str] = None) -> None:
-        self.generator.add('i32.const', f'0x{value:08x}', comment=comment)
+        self.generator.add_statement(f'{self.prefix}.const', f'0x{value:08x}', comment=comment)
+
+class Generator_i32(Generator_i32i64):
+    def __init__(self, generator: 'Generator') -> None:
+        super().__init__('i32', generator)
+
+class Generator_i64(Generator_i32i64):
+    def __init__(self, generator: 'Generator') -> None:
+        super().__init__('i64', generator)
+
+class Generator_f32f64:
+    def __init__(self, prefix: str, generator: 'Generator') -> None:
+        self.prefix = prefix
+        self.generator = generator
+
+        # 2.4.1. Numeric Instructions
+        # fbinop
+        self.add = functools.partial(self.generator.add_statement, f'{prefix}.add')
+
+        # frelop
+        self.eq = functools.partial(self.generator.add_statement, f'{prefix}.eq')
+        self.ne = functools.partial(self.generator.add_statement, f'{prefix}.ne')
+
+        # 2.4.4. Memory Instructions
+        self.load = functools.partial(self.generator.add_statement, f'{prefix}.load')
+        self.store = functools.partial(self.generator.add_statement, f'{prefix}.store')
+
+    def const(self, value: float, comment: Optional[str] = None) -> None:
+        # FIXME: Is this sufficient to guarantee the float comes across properly?
+        self.generator.add_statement(f'{self.prefix}.const', f'{value}', comment=comment)
+
+class Generator_f32(Generator_f32f64):
+    def __init__(self, generator: 'Generator') -> None:
+        super().__init__('f32', generator)
+
+class Generator_f64(Generator_f32f64):
+    def __init__(self, generator: 'Generator') -> None:
+        super().__init__('f64', generator)
 
 class Generator_Local:
     def __init__(self, generator: 'Generator') -> None:
@@ -46,17 +87,17 @@ class Generator_Local:
 
     # 2.4.3. Variable Instructions
     def get(self, variable: VarType_Base, comment: Optional[str] = None) -> None:
-        self.generator.add('local.get', variable.name_ref, comment=comment)
+        self.generator.add_statement('local.get', variable.name_ref, comment=comment)
 
     def set(self, variable: VarType_Base, comment: Optional[str] = None) -> None:
         self.generator.locals.setdefault(variable.name, variable)
 
-        self.generator.add('local.set', variable.name_ref, comment=comment)
+        self.generator.add_statement('local.set', variable.name_ref, comment=comment)
 
     def tee(self, variable: VarType_Base, comment: Optional[str] = None) -> None:
         self.generator.locals.setdefault(variable.name, variable)
 
-        self.generator.add('local.tee', variable.name_ref, comment=comment)
+        self.generator.add_statement('local.tee', variable.name_ref, comment=comment)
 
 class GeneratorBlock:
     def __init__(self, generator: 'Generator', name: str) -> None:
@@ -64,11 +105,11 @@ class GeneratorBlock:
         self.name = name
 
     def __enter__(self) -> None:
-        self.generator.add(self.name)
+        self.generator.add_statement(self.name)
 
     def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
         if not exc_type:
-            self.generator.add('end')
+            self.generator.add_statement('end')
 
 class Generator:
     def __init__(self) -> None:
@@ -76,29 +117,46 @@ class Generator:
         self.locals: Dict[str, VarType_Base] = {}
 
         self.i32 = Generator_i32(self)
+        self.i64 = Generator_i64(self)
+        self.f32 = Generator_f32(self)
+        self.f64 = Generator_f64(self)
 
         # 2.4.3 Variable Instructions
         self.local = Generator_Local(self)
 
         # 2.4.5 Control Instructions
-        self.nop = functools.partial(self.add, 'nop')
-        self.unreachable = functools.partial(self.add, 'unreachable')
+        self.nop = functools.partial(self.add_statement, 'nop')
+        self.unreachable = functools.partial(self.add_statement, 'unreachable')
         # block
         # loop
         self.if_ = functools.partial(GeneratorBlock, self, 'if')
         # br
         # br_if
         # br_table
-        self.return_ = functools.partial(self.add, 'return')
+        self.return_ = functools.partial(self.add_statement, 'return')
         # call
         # call_indirect
 
     def call(self, function: wasm.Function) -> None:
-        self.add('call', f'${function.name}')
+        self.add_statement('call', f'${function.name}')
 
-    def add(self, name: str, *args: str, comment: Optional[str] = None) -> None:
+    def add_statement(self, name: str, *args: str, comment: Optional[str] = None) -> None:
         self.statements.append(wasm.Statement(name, *args, comment=comment))
 
+    def temp_var_i32(self, infix: str) -> VarType_i32:
+        idx = 0
+        while (varname := f'__{infix}_tmp_var_{idx}__') in self.locals:
+            idx += 1
+
+        return VarType_i32(varname)
+
+    def temp_var_u8(self, infix: str) -> VarType_u8:
+        idx = 0
+        while (varname := f'__{infix}_tmp_var_{idx}__') in self.locals:
+            idx += 1
+
+        return VarType_u8(varname)
+
 def func_wrapper(exported: bool = True) -> Callable[[Any], wasm.Function]:
     """
     This wrapper will execute the function and return

tests/integration/test_simple.py

@@ -411,7 +411,9 @@ def testEntry(f: bytes) -> bytes:
 
     result = Suite(code_py).run_code(b'This is a test')
 
-    assert 4 == result.returned_value
+    # THIS DEPENDS ON THE ALLOCATOR
+    # A different allocator will return a different value
+    assert 20 == result.returned_value
 
 @pytest.mark.integration_test
 def test_bytes_length():