Use int.bit_length() when checking fitness for assignment width in order to avoid OOM insanity #224

Author: amykyta3

src/systemrdl/core/ExprVisitor.py

@@ -118,7 +118,7 @@ def visitNumberVerilog(self, ctx: SystemRDLParser.NumberVerilogContext):
                 src_ref_from_antlr(ctx.VLOG_INT())
             )
 
-        if val >= (1 << width):
+        if val.bit_length() > width:
             self.msg.fatal(
                 "Value of integer literal exceeds the specified width",
                 src_ref_from_antlr(ctx.VLOG_INT())

src/systemrdl/properties/builtin.py

@@ -76,7 +76,7 @@ def validate(self, node: m_node.Node, value: Any) -> None:
             # 5.2.2.1-a: If value is a bit mask, the mask shall have the same width
             # as the field
             if not isinstance(value, bool) and isinstance(value, int):
-                if value >= (1 << node.width):
+                if value.bit_length() > node.width:
                     self.env.msg.error(
                         "Bit mask (%d) of property 'dontcompare' exceeds width (%d) of field '%s'"
                         % (value, node.width, node.inst_name),
@@ -433,7 +433,7 @@ def validate(self, node: m_node.Node, value: Any) -> None:
         assert isinstance(node, m_node.FieldNode)
         if isinstance(value, int):
             # 9.5.1-c: The reset value cannot be larger than can fit in the field
-            if value >= (1 << node.width):
+            if value.bit_length() > node.width:
                 self.env.msg.error(
                     "The reset value (%d) of field '%s' cannot fit within its width (%d)"
                     % (value, node.inst_name, node.width),

src/systemrdl/properties/user_defined.py

@@ -90,8 +90,8 @@ def validate(self, node: m_node.Node, value: Any) -> None:
 
             # Spec does not specify, but assuming this check gets ignored for
             # non-vector nodes
-            if isinstance(node, m_node.VectorNode):
-                if value >= (1 << node.width):
+            if isinstance(node, m_node.VectorNode) and isinstance(value, int):
+                if value.bit_length() > node.width:
                     self.env.msg.error(
                         "Value (%d) of the '%s' property cannot fit within the width (%d) of component '%s'"
                         % (value, self.name, node.width, node.inst_name),