py2wasm/ourlang.py

@@ -1,7 +1,7 @@
 """
 Contains the syntax tree for ourlang
 """
-from typing import Any, Dict, List, NoReturn, Union, Tuple
+from typing import Any, Dict, List, Optional, NoReturn, Union, Tuple
 
 import ast
 
@@ -73,6 +73,21 @@ class OurTypeFloat64(OurType):
     def render(self) -> str:
         return 'f64'
 
+class OurTypeTuple(OurType):
+    """
+    The tuple type, 64 bits wide
+    """
+    __slots__ = ('members', )
+
+    members: List[OurType]
+
+    def __init__(self) -> None:
+        self.members = []
+
+    def render(self) -> str:
+        mems = ', '.join(x.render() for x in self.members)
+        return f'({mems}, )'
+
 class Expression:
     """
     An expression within a statement
@@ -227,8 +242,62 @@ class FunctionCall(Expression):
             for arg in self.arguments
         )
 
+        if isinstance(self.function, StructConstructor):
+            return f'{self.function.struct.name}({args})'
+
         return f'{self.function.name}({args})'
 
+class AccessStructMember(Expression):
+    """
+    Access a struct member for reading of writing
+    """
+    __slots__ = ('varref', 'member', )
+
+    varref: VariableReference
+    member: 'StructMember'
+
+    def __init__(self, varref: VariableReference,  member: 'StructMember') -> None:
+        self.varref = varref
+        self.member = member
+
+    def render(self) -> str:
+        return f'{self.varref.render()}.{self.member.name}'
+
+class AccessTupleMember(Expression):
+    """
+    Access a tuple member for reading of writing
+    """
+    __slots__ = ('varref', 'member_idx', 'member_type', )
+
+    varref: VariableReference
+    member_idx: int
+    member_type: 'OurType'
+
+    def __init__(self, varref: VariableReference, member_idx: int, member_type: 'OurType') -> None:
+        self.varref = varref
+        self.member_idx = member_idx
+        self.member_type = member_type
+
+    def render(self) -> str:
+        return f'{self.varref.render()}[{self.member_idx}]'
+
+class TupleCreation(Expression):
+    """
+    Create a tuple instance
+    """
+    __slots__ = ('type', 'members', )
+
+    type: OurTypeTuple
+    members: List[Expression]
+
+    def __init__(self, type_: OurTypeTuple) -> None:
+        self.type = type_
+        self.members = []
+
+    def render(self) -> str:
+        mems = ', '. join(x.render() for x in self.members)
+        return f'({mems}, )'
+
 class Statement:
     """
     A statement within a function
@@ -306,11 +375,12 @@ class Function:
     """
     A function processes input and produces output
     """
-    __slots__ = ('name', 'lineno', 'exported', 'statements', 'returns', 'posonlyargs', )
+    __slots__ = ('name', 'lineno', 'exported', 'buildin', 'statements', 'returns', 'posonlyargs', )
 
     name: str
     lineno: int
     exported: bool
+    buildin: bool
     statements: List[Statement]
     returns: OurType
     posonlyargs: List[Tuple[str, OurType]]
@@ -319,6 +389,7 @@ class Function:
         self.name = name
         self.lineno = lineno
         self.exported = False
+        self.buildin = False
         self.statements = []
         self.returns = OurTypeNone()
         self.posonlyargs = []
@@ -344,6 +415,24 @@ class Function:
                 result += f'    {line}\n' if line else '\n'
         return result
 
+class StructConstructor(Function):
+    """
+    The constructor method for a struct
+    """
+    __slots__ = ('struct', )
+
+    struct: 'Struct'
+
+    def __init__(self, struct: 'Struct') -> None:
+        super().__init__(f'@{struct.name}@__init___@', -1)
+
+        self.returns = struct
+
+        for mem in struct.members:
+            self.posonlyargs.append((mem.name, mem.type, ))
+
+        self.struct = struct
+
 class StructMember:
     """
     Represents a struct member
@@ -353,7 +442,7 @@ class StructMember:
         self.type = type_
         self.offset = offset
 
-class Struct:
+class Struct(OurType):
     """
     A struct has named properties
     """
@@ -368,13 +457,35 @@ class Struct:
         self.lineno = lineno
         self.members = []
 
+    def get_member(self, name: str) -> Optional[StructMember]:
+        """
+        Returns a member by name
+        """
+        for mem in self.members:
+            if mem.name == name:
+                return mem
+
+        return None
+
     def render(self) -> str:
         """
-        Renders the function back to source code format
+        Renders the type back to source code format
 
         This'll look like Python code.
         """
-        return '?'
+        return self.name
+
+    def render_definition(self) -> str:
+        """
+        Renders the definition back to source code format
+
+        This'll look like Python code.
+        """
+        result = f'class {self.name}:\n'
+        for mem in self.members:
+            result += f'    {mem.name}: {mem.type.render()}\n'
+
+        return result
 
 class Module:
     """
@@ -396,6 +507,14 @@ class Module:
         self.functions = {}
         self.structs = {}
 
+        # sqrt is guaranteed by wasm, so we should provide it
+        # ATM it's a 32 bit variant, but that might change.
+        sqrt = Function('sqrt', -2)
+        sqrt.buildin = True
+        sqrt.returns = self.types['f32']
+        sqrt.posonlyargs = [('@', self.types['f32'], )]
+        self.functions[sqrt.name] = sqrt
+
     def render(self) -> str:
         """
         Renders the module back to source code format
@@ -403,10 +522,21 @@ class Module:
         This'll look like Python code.
         """
         result = ''
+
+        for struct in self.structs.values():
+            if result:
+                result += '\n'
+            result += struct.render_definition()
+
         for function in self.functions.values():
+            if function.lineno < 0:
+                # Buildin (-2) or auto generated (-1)
+                continue
+
             if result:
                 result += '\n'
             result += function.render()
+
         return result
 
 class StaticError(Exception):
@@ -431,8 +561,10 @@ class OurVisitor:
 
         _not_implemented(not node.type_ignores, 'Module.type_ignores')
 
+        # Second pass for the types
+
         for stmt in node.body:
-            res = self.visit_Module_stmt(module, stmt)
+            res = self.pre_visit_Module_stmt(module, stmt)
 
             if isinstance(res, Function):
                 if res.name in module.functions:
@@ -449,19 +581,26 @@ class OurVisitor:
                     )
 
                 module.structs[res.name] = res
+                constructor = StructConstructor(res)
+                module.functions[constructor.name] = constructor
+
+        # Second pass for the function bodies
+
+        for stmt in node.body:
+            self.visit_Module_stmt(module, stmt)
 
         return module
 
-    def visit_Module_stmt(self, module: Module, node: ast.stmt) -> Union[Function, Struct]:
+    def pre_visit_Module_stmt(self, module: Module, node: ast.stmt) -> Union[Function, Struct]:
         if isinstance(node, ast.FunctionDef):
-            return self.visit_Module_FunctionDef(module, node)
+            return self.pre_visit_Module_FunctionDef(module, node)
 
         if isinstance(node, ast.ClassDef):
-            return self.visit_Module_ClassDef(module, node)
+            return self.pre_visit_Module_ClassDef(module, node)
 
         raise NotImplementedError(f'{node} on Module')
 
-    def visit_Module_FunctionDef(self, module: Module, node: ast.FunctionDef) -> Function:
+    def pre_visit_Module_FunctionDef(self, module: Module, node: ast.FunctionDef) -> Function:
         function = Function(node.name, node.lineno)
 
         _not_implemented(not node.args.posonlyargs, 'FunctionDef.args.posonlyargs')
@@ -496,18 +635,9 @@ class OurVisitor:
 
         _not_implemented(not node.type_comment, 'FunctionDef.type_comment')
 
-        # Deferred parsing
-
-        our_locals = dict(function.posonlyargs)
-
-        for stmt in node.body:
-            function.statements.append(
-                self.visit_Module_FunctionDef_stmt(module, function, our_locals, stmt)
-            )
-
         return function
 
-    def visit_Module_ClassDef(self, module: Module, node: ast.ClassDef) -> Struct:
+    def pre_visit_Module_ClassDef(self, module: Module, node: ast.ClassDef) -> Struct:
         struct = Struct(node.name, node.lineno)
 
         _not_implemented(not node.bases, 'ClassDef.bases')
@@ -536,6 +666,26 @@ class OurVisitor:
 
         return struct
 
+    def visit_Module_stmt(self, module: Module, node: ast.stmt) -> None:
+        if isinstance(node, ast.FunctionDef):
+            self.visit_Module_FunctionDef(module, node)
+            return
+
+        if isinstance(node, ast.ClassDef):
+            return
+
+        raise NotImplementedError(f'{node} on Module')
+
+    def visit_Module_FunctionDef(self, module: Module, node: ast.FunctionDef) -> None:
+        function = module.functions[node.name]
+
+        our_locals = dict(function.posonlyargs)
+
+        for stmt in node.body:
+            function.statements.append(
+                self.visit_Module_FunctionDef_stmt(module, function, our_locals, stmt)
+            )
+
     def visit_Module_FunctionDef_stmt(self, module: Module, function: Function, our_locals: OurLocals, node: ast.stmt) -> Statement:
         if isinstance(node, ast.Return):
             if node.value is None:
@@ -571,6 +721,8 @@ class OurVisitor:
                 operator = '+'
             elif isinstance(node.op, ast.Sub):
                 operator = '-'
+            elif isinstance(node.op, ast.Mult):
+                operator = '*'
             else:
                 raise NotImplementedError(f'Operator {node.op}')
 
@@ -602,6 +754,10 @@ class OurVisitor:
 
             if isinstance(node.ops[0], ast.Gt):
                 operator = '>'
+            elif isinstance(node.ops[0], ast.Eq):
+                operator = '=='
+            elif isinstance(node.ops[0], ast.Lt):
+                operator = '<'
             else:
                 raise NotImplementedError(f'Operator {node.ops}')
 
@@ -615,33 +771,23 @@ class OurVisitor:
             )
 
         if isinstance(node, ast.Call):
-            if node.keywords:
-                _raise_static_error(node, 'Keyword calling not supported') # Yet?
-
-            if not isinstance(node.func, ast.Name):
-                raise NotImplementedError(f'Calling methods that are not a name {node.func}')
-            if not isinstance(node.func.ctx, ast.Load):
-                _raise_static_error(node, 'Must be load context')
-
-            if node.func.id not in module.functions:
-                _raise_static_error(node, 'Call to undefined function')
-
-            func = module.functions[node.func.id]
-            if func.returns != exp_type:
-                _raise_static_error(node, f'Function does not return {exp_type.render()}')
-
-            result = FunctionCall(func)
-            result.arguments.extend(
-                self.visit_Module_FunctionDef_expr(module, function, our_locals, exp_type, expr)
-                for expr in node.args
-            )
-            return result
+            return self.visit_Module_FunctionDef_Call(module, function, our_locals, exp_type, node)
 
         if isinstance(node, ast.Constant):
             return self.visit_Module_FunctionDef_Constant(
                 module, function, exp_type, node,
             )
 
+        if isinstance(node, ast.Attribute):
+            return self.visit_Module_FunctionDef_Attribute(
+                module, function, our_locals, exp_type, node,
+            )
+
+        if isinstance(node, ast.Subscript):
+            return self.visit_Module_FunctionDef_Subscript(
+                module, function, our_locals, exp_type, node,
+            )
+
         if isinstance(node, ast.Name):
             if not isinstance(node.ctx, ast.Load):
                 _raise_static_error(node, 'Must be load context')
@@ -649,8 +795,120 @@ class OurVisitor:
             if node.id in our_locals:
                 return VariableReference(our_locals[node.id], node.id)
 
+        if isinstance(node, ast.Tuple):
+            if not isinstance(node.ctx, ast.Load):
+                _raise_static_error(node, 'Must be load context')
+
+            if not isinstance(exp_type, OurTypeTuple):
+                _raise_static_error(node, f'Expression is expecting a {exp_type.render()}, not a tuple')
+
+            if len(exp_type.members) != len(node.elts):
+                _raise_static_error(node, f'Expression is expecting a tuple of size {len(exp_type.members)}, but {len(node.elts)} are given')
+
+            result = TupleCreation(exp_type)
+            result.members = [
+                self.visit_Module_FunctionDef_expr(module, function, our_locals, arg_type, arg_node)
+                for arg_node, arg_type in zip(node.elts, exp_type.members)
+            ]
+            return result
+
         raise NotImplementedError(f'{node} as expr in FunctionDef')
 
+    def visit_Module_FunctionDef_Call(self, module: Module, function: Function, our_locals: OurLocals, exp_type: OurType, node: ast.Call) -> FunctionCall:
+        if node.keywords:
+            _raise_static_error(node, 'Keyword calling not supported') # Yet?
+
+        if not isinstance(node.func, ast.Name):
+            raise NotImplementedError(f'Calling methods that are not a name {node.func}')
+        if not isinstance(node.func.ctx, ast.Load):
+            _raise_static_error(node, 'Must be load context')
+
+        if node.func.id in module.structs:
+            struct = module.structs[node.func.id]
+            struct_constructor = StructConstructor(struct)
+
+            func = module.functions[struct_constructor.name]
+        else:
+            if node.func.id not in module.functions:
+                _raise_static_error(node, 'Call to undefined function')
+
+            func = module.functions[node.func.id]
+
+        if func.returns != exp_type:
+            _raise_static_error(node, f'Function {node.func.id} does not return {exp_type.render()}')
+
+        if len(func.posonlyargs) != len(node.args):
+            _raise_static_error(node, f'Function {node.func.id} requires {len(func.posonlyargs)} arguments but {len(node.args)} are given')
+
+        result = FunctionCall(func)
+        result.arguments.extend(
+            self.visit_Module_FunctionDef_expr(module, function, our_locals, arg_type, arg_expr)
+            for arg_expr, (_, arg_type) in zip(node.args, func.posonlyargs)
+        )
+        return result
+
+    def visit_Module_FunctionDef_Attribute(self, module: Module, function: Function, our_locals: OurLocals, exp_type: OurType, node: ast.Attribute) -> Expression:
+        if not isinstance(node.value, ast.Name):
+            _raise_static_error(node, 'Must reference a name')
+
+        if not isinstance(node.ctx, ast.Load):
+            _raise_static_error(node, 'Must be load context')
+
+        if not node.value.id in our_locals:
+            _raise_static_error(node, f'Undefined variable {node.value.id}')
+
+        node_typ = our_locals[node.value.id]
+        if not isinstance(node_typ, Struct):
+            _raise_static_error(node, f'Cannot take attribute of non-struct {node.value.id}')
+
+        member = node_typ.get_member(node.attr)
+        if member is None:
+            _raise_static_error(node, f'{node_typ.name} has no attribute {node.attr}')
+
+        if exp_type != member.type:
+            _raise_static_error(node, f'Expected {exp_type.render()}, got {member.type.render()} instead')
+
+        return AccessStructMember(
+            VariableReference(node_typ, node.value.id),
+            member,
+        )
+
+    def visit_Module_FunctionDef_Subscript(self, module: Module, function: Function, our_locals: OurLocals, exp_type: OurType, node: ast.Subscript) -> Expression:
+        if not isinstance(node.value, ast.Name):
+            _raise_static_error(node, 'Must reference a name')
+
+        if not isinstance(node.slice, ast.Index):
+            _raise_static_error(node, 'Must subscript using an index')
+
+        if not isinstance(node.slice.value, ast.Constant):
+            _raise_static_error(node, 'Must subscript using a constant index') # FIXME: Implement variable indexes
+
+        if not isinstance(node.slice.value.value, int):
+            _raise_static_error(node, 'Must subscript using a constant integer index')
+
+        if not isinstance(node.ctx, ast.Load):
+            _raise_static_error(node, 'Must be load context')
+
+        if not node.value.id in our_locals:
+            _raise_static_error(node, f'Undefined variable {node.value.id}')
+
+        node_typ = our_locals[node.value.id]
+        if not isinstance(node_typ, OurTypeTuple):
+            _raise_static_error(node, f'Cannot take index of non-tuple {node.value.id}')
+
+        if len(node_typ.members) <= node.slice.value.value:
+            _raise_static_error(node, f'Index {node.slice.value.value} out of bounds for tuple {node.value.id}')
+
+        member = node_typ.members[node.slice.value.value]
+        if exp_type != member:
+            _raise_static_error(node, f'Expected {exp_type.render()}, got {member.render()} instead')
+
+        return AccessTupleMember(
+            VariableReference(node_typ, node.value.id),
+            node.slice.value.value,
+            member,
+        )
+
     def visit_Module_FunctionDef_Constant(self, module: Module, function: Function, exp_type: OurType, node: ast.Constant) -> Expression:
         del module
         del function
@@ -696,10 +954,24 @@ class OurVisitor:
             if not isinstance(node.ctx, ast.Load):
                 _raise_static_error(node, 'Must be load context')
 
-            if node.id not in module.types:
-                _raise_static_error(node, 'Unrecognized type')
+            if node.id in module.types:
+                return module.types[node.id]
 
-            return module.types[node.id]
+            if node.id in module.structs:
+                return module.structs[node.id]
+
+            _raise_static_error(node, f'Unrecognized type {node.id}')
+
+        if isinstance(node, ast.Tuple):
+            if not isinstance(node.ctx, ast.Load):
+                _raise_static_error(node, 'Must be load context')
+
+            result = OurTypeTuple()
+            result.members = [
+                self.visit_type(module, elt)
+                for elt in node.elts
+            ]
+            return result
 
         raise NotImplementedError(f'{node} as type')
 

py2wasm/python.py

@@ -41,14 +41,12 @@ class Visitor:
         if isinstance(name, ast.expr):
             if isinstance(name, ast.Name):
                 name = name.id
-            elif isinstance(name, ast.Subscript) and isinstance(name.value, ast.Name) and name.value.id == 'Tuple':
+            elif isinstance(name, ast.Tuple):
                 assert isinstance(name.ctx, ast.Load)
-                assert isinstance(name.slice, ast.Index)
-                assert isinstance(name.slice.value, ast.Tuple)
 
                 args: List[wasm.TupleMember] = []
                 offset = 0
-                for name_arg in name.slice.value.elts:
+                for name_arg in name.elts:
                     arg = wasm.TupleMember(
                         self._get_type(name_arg),
                         offset

tests/integration/helpers.py

@@ -14,7 +14,7 @@ import wasmer_compiler_cranelift
 
 import wasmtime
 
-from py2wasm.utils import process
+from py2wasm.utils import our_process, process
 
 DASHES = '-' * 16
 
@@ -69,6 +69,9 @@ class Suite:
 
         Returned is an object with the results set
         """
+        our_module = our_process(self.code_py, self.test_name)
+        assert self.code_py == '\n' + our_module.render() # \n for formatting in tests
+
         code_wat = process(self.code_py, self.test_name)
 
         sys.stderr.write(f'{DASHES} Assembly {DASHES}\n')

tests/integration/test_simple.py

@@ -179,6 +179,7 @@ def testEntry(a: i32) -> i32:
     assert 1 == result.returned_value
 
 @pytest.mark.integration_test
+@pytest.mark.skip('Such a return is not how things should be')
 def test_if_complex():
     code_py = """
 @exported
@@ -254,7 +255,6 @@ def testEntry() -> i32:
 @pytest.mark.integration_test
 def test_struct_0():
     code_py = """
-
 class CheckedValue:
     value: i32
 
@@ -274,11 +274,10 @@ def helper(cv: CheckedValue) -> i32:
 @pytest.mark.integration_test
 def test_struct_1():
     code_py = """
-
 class Rectangle:
     height: i32
     width: i32
-    border: i32 # = 5
+    border: i32
 
 @exported
 def testEntry() -> i32:
@@ -296,21 +295,17 @@ def helper(shape: Rectangle) -> i32:
 @pytest.mark.integration_test
 def test_struct_2():
     code_py = """
-
 class Rectangle:
     height: i32
     width: i32
-    border: i32 # = 5
+    border: i32
 
 @exported
 def testEntry() -> i32:
     return helper(Rectangle(100, 150, 2), Rectangle(200, 90, 3))
 
 def helper(shape1: Rectangle, shape2: Rectangle) -> i32:
-    return (
-        shape1.height + shape1.width + shape1.border
-        + shape2.height + shape2.width + shape2.border
-    )
+    return shape1.height + shape1.width + shape1.border + shape2.height + shape2.width + shape2.border
 """
 
     result = Suite(code_py, 'test_call').run_code()
@@ -321,12 +316,11 @@ def helper(shape1: Rectangle, shape2: Rectangle) -> i32:
 @pytest.mark.integration_test
 def test_tuple_int():
     code_py = """
-
 @exported
 def testEntry() -> i32:
     return helper((24, 57, 80, ))
 
-def helper(vector: Tuple[i32, i32, i32]) -> i32:
+def helper(vector: (i32, i32, i32, )) -> i32:
     return vector[0] + vector[1] + vector[2]
 """
 
@@ -338,14 +332,11 @@ def helper(vector: Tuple[i32, i32, i32]) -> i32:
 @pytest.mark.integration_test
 def test_tuple_float():
     code_py = """
-
 @exported
 def testEntry() -> f32:
     return helper((1.0, 2.0, 3.0, ))
 
-def helper(v: Tuple[f32, f32, f32]) -> f32:
-    # sqrt is guaranteed by wasm, so we can use it
-    # ATM it's a 32 bit variant, but that might change.
+def helper(v: (f32, f32, f32, )) -> f32:
     return sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2])
 """