Add IntMonomorphizer.

artiq/compiler/module.py

@@ -8,15 +8,18 @@ from . import prelude, types, transforms
 
 class Module:
     def __init__(self, source_buffer, engine=diagnostic.Engine(all_errors_are_fatal=True)):
-        parsetree, comments = parse_buffer(source_buffer, engine=engine)
-        self.name = os.path.basename(source_buffer.name)
-
         asttyped_rewriter = transforms.ASTTypedRewriter(engine=engine)
-        typedtree = asttyped_rewriter.visit(parsetree)
-        self.globals = asttyped_rewriter.globals
-
         inferencer = transforms.Inferencer(engine=engine)
+        int_monomorphizer = transforms.IntMonomorphizer(engine=engine)
+
+        parsetree, comments = parse_buffer(source_buffer, engine=engine)
+        typedtree = asttyped_rewriter.visit(parsetree)
         inferencer.visit(typedtree)
+        int_monomorphizer.visit(typedtree)
+        inferencer.visit(typedtree)
+
+        self.name = os.path.basename(source_buffer.name)
+        self.globals = asttyped_rewriter.globals
 
     @classmethod
     def from_string(klass, source_string, name="input.py", first_line=1):

artiq/compiler/transforms/__init__.py

@@ -1,2 +1,3 @@
 from .asttyped_rewriter import ASTTypedRewriter
 from .inferencer import Inferencer
+from .int_monomorphizer import IntMonomorphizer

artiq/compiler/transforms/asttyped_rewriter.py

@@ -1,3 +1,8 @@
+"""
+:class:`ASTTypedRewriter` rewrites a parsetree (:mod:`pythonparser.ast`)
+to a typedtree (:mod:`..asttyped`).
+"""
+
 from pythonparser import algorithm, diagnostic
 from .. import asttyped, types, builtins, prelude
 

artiq/compiler/transforms/inferencer.py

@@ -1,3 +1,7 @@
+"""
+:class:`Inferencer` performs unification-based inference on a typedtree.
+"""
+
 from collections import OrderedDict
 from pythonparser import algorithm, diagnostic, ast
 from .. import asttyped, types, builtins
@@ -168,6 +172,7 @@ class Inferencer(algorithm.Visitor):
         if coerced_node.type.find() == typ.find():
             return coerced_node
         elif isinstance(coerced_node, asttyped.CoerceT):
+            node = coerced_node
             node.type, node.other_expr = typ, other_node
         else:
             node = asttyped.CoerceT(type=typ, expr=coerced_node, other_expr=other_node,
@@ -191,7 +196,7 @@ class Inferencer(algorithm.Visitor):
         elif any(map(builtins.is_float, node_types)):
             typ = builtins.TFloat()
         elif any(map(builtins.is_int, node_types)):
-            widths = map(builtins.get_int_width, node_types)
+            widths = list(map(builtins.get_int_width, node_types))
             if all(widths):
                 typ = builtins.TInt(types.TValue(max(widths)))
             else:

artiq/compiler/transforms/int_monomorphizer.py

@@ -0,0 +1,28 @@
+"""
+:class:`IntMonomorphizer` collapses the integer literals of undetermined
+width to 32 bits, assuming they fit into 32 bits, or 64 bits if they
+do not.
+"""
+
+from pythonparser import algorithm, diagnostic
+from .. import types, builtins
+
+class IntMonomorphizer(algorithm.Visitor):
+    def __init__(self, engine):
+        self.engine = engine
+
+    def visit_NumT(self, node):
+        if builtins.is_int(node.type):
+            if types.is_var(node.type["width"]):
+                if -2**31 < node.n < 2**31-1:
+                    width = 32
+                elif -2**63 < node.n < 2**63-1:
+                    width = 64
+                else:
+                    diag = diagnostic.Diagnostic("error",
+                        "integer literal out of range for a signed 64-bit value", {},
+                        node.loc)
+                    self.engine.process(diag)
+                    return
+
+                node.type["width"].unify(types.TValue(width))

artiq/compiler/types.py

@@ -168,8 +168,8 @@ class TFunction(Type):
         if isinstance(other, TFunction) and \
                 self.args.keys() == other.args.keys() and \
                 self.optargs.keys() == other.optargs.keys():
-            for selfarg, otherarg in zip(self.args.values() + self.optargs.values(),
+            for selfarg, otherarg in zip(list(self.args.values()) + list(self.optargs.values()),
-                                         other.args.values() + other.optargs.values()):
+                                         list(other.args.values()) + list(other.optargs.values())):
                 selfarg.unify(otherarg)
             self.ret.unify(other.ret)
         elif isinstance(other, TVar):