py2wasm/python.py

@@ -39,6 +39,23 @@ 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':
+                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:
+                    arg = wasm.TupleMember(
+                        self._get_type(name_arg),
+                        offset
+                    )
+
+                    args.append(arg)
+                    offset += arg.type.alloc_size()
+
+                return wasm.OurTypeTuple(args)
             else:
                 raise NotImplementedError(f'_get_type(ast.{type(name).__name__})')
 
@@ -332,11 +349,17 @@ class Visitor:
         if isinstance(node, ast.Constant):
             return self.visit_Constant(exp_type, node)
 
+        if isinstance(node, ast.Attribute):
+            return self.visit_Attribute(module, wlocals, exp_type, node)
+
+        if isinstance(node, ast.Subscript):
+            return self.visit_Subscript(module, wlocals, exp_type, node)
+
         if isinstance(node, ast.Name):
             return self.visit_Name(wlocals, exp_type, node)
 
-        if isinstance(node, ast.Attribute):
-            return self.visit_Attribute(module, wlocals, exp_type, node)
+        if isinstance(node, ast.Tuple):
+            return self.visit_Tuple(wlocals, exp_type, node)
 
         raise NotImplementedError(node)
 
@@ -470,7 +493,7 @@ class Visitor:
         This instantiates the class
         """
 
-        # TODO: malloc call
+        # TODO: free call
 
         yield wasm.Statement('i32.const', str(cls.alloc_size()))
         yield wasm.Statement('call', '$___new_reference___')
@@ -586,6 +609,77 @@ class Visitor:
         yield wasm.Statement('local.get', '$' + node.value.id)
         yield wasm.Statement(exp_type.to_wasm() + '.load', 'offset=' + str(member.offset))
 
+    def visit_Subscript(
+            self,
+            module: wasm.Module,
+            wlocals: WLocals,
+            exp_type: wasm.OurType,
+            node: ast.Subscript,
+        ) -> StatementGenerator:
+        """
+        Visits an Subscript node as (part of) an expression
+        """
+        if not isinstance(node.value, ast.Name):
+            raise NotImplementedError
+
+        if not isinstance(node.slice, ast.Index):
+            raise NotImplementedError
+
+        if not isinstance(node.slice.value, ast.Constant):
+            raise NotImplementedError
+
+        if not isinstance(node.slice.value.value, int):
+            raise NotImplementedError
+
+        if not isinstance(node.ctx, ast.Load):
+            raise NotImplementedError
+
+        tpl_idx = node.slice.value.value
+
+        tpl = wlocals[node.value.id]
+
+        assert isinstance(tpl, wasm.OurTypeTuple), f'Cannot take index of {tpl}'
+
+        assert 0 <= tpl_idx < len(tpl.members), \
+            f'Tuple index out of bounds; {node.value.id} has {len(tpl.members)} members'
+
+        member = tpl.members[tpl_idx]
+
+        yield wasm.Statement('local.get', '$' + node.value.id)
+        yield wasm.Statement(exp_type.to_wasm() + '.load', 'offset=' + str(member.offset))
+
+    def visit_Tuple(
+            self,
+            wlocals: WLocals,
+            exp_type: wasm.OurType,
+            node: ast.Tuple,
+        ) -> StatementGenerator:
+        """
+        Visits an Tuple node as (part of) an expression
+        """
+        assert isinstance(exp_type, wasm.OurTypeTuple), 'Expression is not expecting a tuple'
+
+        # TODO: free call
+
+        tpl = exp_type
+
+        yield wasm.Statement('nop', comment='Start tuple allocation')
+
+        yield wasm.Statement('i32.const', str(tpl.alloc_size()))
+        yield wasm.Statement('call', '$___new_reference___')
+        yield wasm.Statement('local.set', '$___new_reference___addr', comment='Allocate for tuple')
+
+        for member, arg in zip(tpl.members, node.elts):
+            if not isinstance(arg, ast.Constant):
+                raise NotImplementedError('TODO: Non-const tuple members')
+
+            yield wasm.Statement('local.get', '$___new_reference___addr')
+            yield wasm.Statement(f'{member.type.to_wasm()}.const', str(arg.value))
+            yield wasm.Statement(f'{member.type.to_wasm()}.store', 'offset=' + str(member.offset),
+                comment='Write tuple value to memory')
+
+        yield wasm.Statement('local.get', '$___new_reference___addr', comment='Store tuple address on stack')
+
     def visit_Name(self, wlocals: WLocals, exp_type: wasm.OurType, node: ast.Name) -> StatementGenerator:
         """
         Visits a Name node as (part of) an expression

py2wasm/wasm.py

@@ -80,6 +80,27 @@ class OurTypeClass(OurType):
     def alloc_size(self) -> int:
         return sum(x.type.alloc_size() for x in self.members)
 
+class TupleMember:
+    """
+    Represents a tuple member
+    """
+    def __init__(self, type_: OurType, offset: int) -> None:
+        self.type = type_
+        self.offset = offset
+
+class OurTypeTuple(OurType):
+    """
+    Represents a tuple
+    """
+    def __init__(self, members: List[TupleMember]) -> None:
+        self.members = members
+
+    def to_wasm(self) -> str:
+        return 'i32' # WASM uses 32 bit pointers
+
+    def alloc_size(self) -> int:
+        return sum(x.type.alloc_size() for x in self.members)
+
 
 Param = Tuple[str, OurType]
 

tests/integration/test_simple.py

@@ -317,3 +317,20 @@ def helper(shape1: Rectangle, shape2: Rectangle) -> i32:
 
     assert 545 == result.returned_value
     assert [] == result.log_int32_list
+
+@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:
+    return vector[0] + vector[1] + vector[2]
+"""
+
+    result = Suite(code_py, 'test_call').run_code()
+
+    assert 161 == result.returned_value
+    assert [] == result.log_int32_list