adding decoder logic

src/peakrdl_busdecoder/__peakrdl__.py

@@ -101,6 +101,7 @@ class Exporter(ExporterSubcommandPlugin):
         arg_group.add_argument(
             "--unroll",
             action="store_true",
+            default=False,
             help="""Unroll arrayed addressable nodes into separate instances in
             the CPU interface. By default, arrayed nodes are kept as arrays.
             """,
@@ -117,5 +118,5 @@ class Exporter(ExporterSubcommandPlugin):
             module_name=options.module_name,
             package_name=options.package_name,
             address_width=options.addr_width,
-            unroll=options.unroll,
+            cpuif_unroll=options.unroll,
         )

src/peakrdl_busdecoder/addr_decode.py

@@ -1,157 +0,0 @@
-from typing import TYPE_CHECKING
-
-from systemrdl.node import FieldNode, RegNode
-from systemrdl.walker import WalkerAction
-
-from .forloop_generator import RDLForLoopGenerator
-from .sv_int import SVInt
-from .utils import get_indexed_path
-
-if TYPE_CHECKING:
-    from systemrdl.node import AddressableNode, AddrmapNode
-
-    from .exporter import BusDecoderExporter
-
-
-class AddressDecode:
-    def __init__(self, exp: "BusDecoderExporter") -> None:
-        self.exp = exp
-
-    @property
-    def top_node(self) -> "AddrmapNode":
-        return self.exp.ds.top_node
-
-    def get_implementation(self) -> str:
-        gen = DecodeLogicGenerator(self)
-        s = gen.get_content(self.top_node)
-        assert s is not None
-        return s
-
-    def get_access_strobe(self, node: RegNode | FieldNode, reduce_substrobes: bool = True) -> str:
-        """
-        Returns the Verilog string that represents the register/field's access strobe.
-        """
-        if isinstance(node, FieldNode):
-            field = node
-            path = get_indexed_path(self.top_node, node.parent)
-
-            regwidth = node.parent.get_property("regwidth")
-            accesswidth = node.parent.get_property("accesswidth")
-            if regwidth > accesswidth:
-                # Is wide register.
-                # Determine the substrobe(s) relevant to this field
-                sidx_hi = field.msb // accesswidth
-                sidx_lo = field.lsb // accesswidth
-                if sidx_hi == sidx_lo:
-                    suffix = f"[{sidx_lo}]"
-                else:
-                    suffix = f"[{sidx_hi}:{sidx_lo}]"
-                path += suffix
-
-                if sidx_hi != sidx_lo and reduce_substrobes:
-                    return "|decoded_reg_strb." + path
-
-        else:
-            path = get_indexed_path(self.top_node, node)
-
-        return "decoded_reg_strb." + path
-
-    def get_external_block_access_strobe(self, node: "AddressableNode") -> str:
-        assert node.external
-        assert not isinstance(node, RegNode)
-        path = get_indexed_path(self.top_node, node)
-        return "decoded_reg_strb." + path
-
-
-class DecodeLogicGenerator(RDLForLoopGenerator):
-    def __init__(self, addr_decode: AddressDecode) -> None:
-        self.addr_decode = addr_decode
-        super().__init__()
-
-        # List of address strides for each dimension
-        self._array_stride_stack: list[int] = []
-
-    def enter_AddressableComponent(self, node: "AddressableNode") -> WalkerAction | None:
-        super().enter_AddressableComponent(node)
-
-        if node.array_dimensions:
-            assert node.array_stride is not None
-            # Collect strides for each array dimension
-            current_stride = node.array_stride
-            strides: list[int] = []
-            for dim in reversed(node.array_dimensions):
-                strides.append(current_stride)
-                current_stride *= dim
-            strides.reverse()
-            self._array_stride_stack.extend(strides)
-
-        if node.external and not isinstance(node, RegNode):
-            # Is an external block
-            addr_str = self._get_address_str(node)
-            strb = self.addr_decode.get_external_block_access_strobe(node)
-            rhs = f"cpuif_req_masked & (cpuif_addr >= {addr_str}) & (cpuif_addr <= {addr_str} + {SVInt(node.size - 1, self.addr_decode.exp.ds.addr_width)})"
-            self.add_content(f"{strb} = {rhs};")
-            self.add_content(f"is_external |= {rhs};")
-            return WalkerAction.SkipDescendants
-
-        return WalkerAction.Continue
-
-    def _get_address_str(self, node: "AddressableNode", subword_offset: int = 0) -> str:
-        expr_width = self.addr_decode.exp.ds.addr_width
-        a = str(
-            SVInt(
-                node.raw_absolute_address - self.addr_decode.top_node.raw_absolute_address + subword_offset,
-                expr_width,
-            )
-        )
-        for i, stride in enumerate(self._array_stride_stack):
-            a += f" + ({expr_width})'(i{i}) * {SVInt(stride, expr_width)}"
-        return a
-
-    def enter_Reg(self, node: RegNode) -> None:
-        regwidth = node.get_property("regwidth")
-        accesswidth = node.get_property("accesswidth")
-
-        if regwidth == accesswidth:
-            rhs = f"cpuif_req_masked & (cpuif_addr == {self._get_address_str(node)})"
-            s = f"{self.addr_decode.get_access_strobe(node)} = {rhs};"
-            self.add_content(s)
-            if node.external:
-                readable = node.has_sw_readable
-                writable = node.has_sw_writable
-                if readable and writable:
-                    self.add_content(f"is_external |= {rhs};")
-                elif readable and not writable:
-                    self.add_content(f"is_external |= {rhs} & !cpuif_req_is_wr;")
-                elif not readable and writable:
-                    self.add_content(f"is_external |= {rhs} & cpuif_req_is_wr;")
-                else:
-                    raise RuntimeError
-        else:
-            # Register is wide. Create a substrobe for each subword
-            n_subwords = regwidth // accesswidth
-            subword_stride = accesswidth // 8
-            for i in range(n_subwords):
-                rhs = f"cpuif_req_masked & (cpuif_addr == {self._get_address_str(node, subword_offset=(i * subword_stride))})"
-                s = f"{self.addr_decode.get_access_strobe(node)}[{i}] = {rhs};"
-                self.add_content(s)
-                if node.external:
-                    readable = node.has_sw_readable
-                    writable = node.has_sw_writable
-                    if readable and writable:
-                        self.add_content(f"is_external |= {rhs};")
-                    elif readable and not writable:
-                        self.add_content(f"is_external |= {rhs} & !cpuif_req_is_wr;")
-                    elif not readable and writable:
-                        self.add_content(f"is_external |= {rhs} & cpuif_req_is_wr;")
-                    else:
-                        raise RuntimeError
-
-    def exit_AddressableComponent(self, node: "AddressableNode") -> None:
-        super().exit_AddressableComponent(node)
-
-        if not node.array_dimensions:
-            return
-
-        for _ in node.array_dimensions:
-            self._array_stride_stack.pop()

src/peakrdl_busdecoder/body/__init__.py

@@ -0,0 +1,15 @@
+from .body import Body, SupportsStr
+from .for_loop_body import ForLoopBody
+from .while_loop_body import WhileLoopBody
+from .if_body import IfBody
+from .combinational_body import CombinationalBody
+
+
+__all__ = [
+    "Body",
+    "SupportsStr",
+    "ForLoopBody",
+    "WhileLoopBody",
+    "IfBody",
+    "CombinationalBody",
+]

src/peakrdl_busdecoder/body/body.py

@@ -0,0 +1,17 @@
+from typing import Protocol, Self
+
+
+class SupportsStr(Protocol):
+    def __str__(self) -> str: ...
+
+
+class Body:
+    def __init__(self) -> None:
+        self.lines: list[SupportsStr] = []
+
+    def __str__(self) -> str:
+        return "\n".join(map(str, self.lines))
+
+    def __add__(self, other: SupportsStr) -> Self:
+        self.lines.append(other)
+        return self

src/peakrdl_busdecoder/body/combinational_body.py

@@ -0,0 +1,8 @@
+from textwrap import indent
+from .body import Body
+
+class CombinationalBody(Body):
+    def __str__(self) -> str:
+        return f"""always_comb begin
+            {indent(super().__str__(), "\t")}
+        end"""

src/peakrdl_busdecoder/body/for_loop_body.py

@@ -0,0 +1,15 @@
+from textwrap import indent
+from .body import Body
+
+
+class ForLoopBody(Body):
+    def __init__(self, type: str, iterator: str, dim: int):
+        super().__init__()
+        self._type = type
+        self._iterator = iterator
+        self._dim = dim
+
+    def __str__(self) -> str:
+        return f"""for ({self._type} {self._iterator} = 0; {self._iterator} < {self._dim}; {self._iterator}++) begin
+{indent(super().__str__(), "\t")}
+end"""

src/peakrdl_busdecoder/body/if_body.py

@@ -0,0 +1,84 @@
+from __future__ import annotations
+from types import EllipsisType
+from typing import Self
+from .body import Body, SupportsStr
+
+
+class IfBody(Body):
+    def __init__(self, *, indent: int = 4) -> None:
+        super().__init__()
+        # (None means 'else')
+        self._branches: list[tuple[SupportsStr | None, Body]] = []
+        self._has_else = False
+        self._indent = " " * indent
+
+    # --- Item access: if/else-if via condition; else via Ellipsis/None ---
+    def __getitem__(self, condition: SupportsStr | EllipsisType | None) -> Body:
+        if self._has_else:
+            raise RuntimeError("Cannot add branches after an 'else' branch.")
+        if condition is Ellipsis or condition is None:
+            if self._has_else:
+                raise RuntimeError("Only one 'else' branch is allowed.")
+            self._has_else = True
+            b = Body()
+            self._branches.append((None, b))
+            return b
+        # conditional branch
+        b = Body()
+        self._branches.append((condition, b))
+        return b
+
+    # --- In-place or: if/else-if via (cond, Body); else via Body ---
+    def __ior__(self, other: tuple[SupportsStr, Body] | Body) -> Self:
+        if isinstance(other, Body):
+            if self._has_else:
+                raise RuntimeError("Only one 'else' branch is allowed.")
+            if self._has_else or (self._branches and self._branches[-1][0] is None):
+                raise RuntimeError("Cannot add branches after an 'else' branch.")
+            self._branches.append((None, other))
+            self._has_else = True
+            return self
+
+        cond, body = other
+        if self._has_else:
+            raise RuntimeError("Cannot add branches after an 'else' branch.")
+        self._branches.append((cond, body))
+        return self
+
+    # --- Context manager for a branch ---
+    class _BranchCtx:
+        def __init__(self, outer: IfBody, condition: SupportsStr | None) -> None:
+            self._outer = outer
+            # route through __getitem__ to reuse validation logic
+            self._body = outer[Ellipsis if condition is None else condition]
+
+        def __enter__(self) -> Body:
+            return self._body
+
+        def __exit__(
+            self,
+            exc_type: type[BaseException] | None,
+            exc: BaseException | None,
+            tb: object | None,
+        ) -> bool:
+            return False
+
+    def cm(self, condition: SupportsStr | None) -> "IfBody._BranchCtx":
+        """Use with: with ifb.cm('cond') as b: ...  ; use None for else."""
+        return IfBody._BranchCtx(self, condition)
+
+    # --- Rendering ---
+    def __str__(self) -> str:
+        out: list[str] = []
+        for i, (cond, body) in enumerate(self._branches):
+            if i == 0 and cond is not None:
+                out.append(f"if ({cond}) begin")
+            elif cond is not None:
+                out.append(f"else if ({cond}) begin")
+            else:
+                out.append("else begin")
+            body_str = str(body)
+            if body_str:
+                out.extend(self._indent + ln for ln in body_str.splitlines())
+            out.append("end")
+        return "\n".join(out)

src/peakrdl_busdecoder/body/while_loop_body.py

@@ -0,0 +1,13 @@
+from textwrap import indent
+from .body import Body
+
+
+class WhileLoopBody(Body):
+    def __init__(self, condition: str):
+        super().__init__()
+        self._condition = condition
+
+    def __str__(self) -> str:
+        return f"""while ({self._condition}) begin
+            {indent(super().__str__(), "\t")}
+        end"""

src/peakrdl_busdecoder/cpuif/apb3/apb3_cpuif.py

@@ -12,7 +12,7 @@ class APB3Cpuif(BaseCpuif):
         if not child.is_array:
             return base
         if child.current_idx is not None:
-            return f"{base}_{'_'.join(map(str, child.current_idx))} [N_{child.inst_name.upper()}S]"
+            return f"{base}_{'_'.join(map(str, child.current_idx))}"
         return f"{base} [N_{child.inst_name.upper()}S]"
 
     @property
@@ -75,4 +75,4 @@ class APB3Cpuif(BaseCpuif):
         address on the bus matches the address range of the given node.
         """
         addr_pred = self.get_address_predicate(node)
-        return addr_pred
+        return addr_pred

src/peakrdl_busdecoder/cpuif/apb3/apb3_cpuif_flat.py

@@ -61,3 +61,4 @@ class APB3CpuifFlat(BaseCpuif):
         if idx is not None:
             return f"{base}_{signal}[{idx}]"
         return f"{base}_{signal}[N_{node.inst_name.upper()}S]"
+

src/peakrdl_busdecoder/cpuif/apb3/apb3_tmpl.sv

@@ -1,4 +1,4 @@
-{%- if cpuif.is_interface -%}
+{%- if cpuif.is_interface %}
 `ifndef SYNTHESIS
     initial begin
         assert_bad_addr_width: assert($bits({{cpuif.signal("PADDR")}}) >= {{ds.package_name}}::{{ds.module_name|upper}}_MIN_ADDR_WIDTH)
@@ -16,14 +16,14 @@ assign cpuif_rd_en = !{{cpuif.signal("PWRITE")}};
 
 {%- for child in cpuif.addressable_children -%}
 {%- if child is array -%}
-for (genvar g_{{child.inst_name|lower}}_idx = 0; g_{{child.inst_name|lower}}_idx < N_{{child.inst_name|upper}}S; g_{{child.inst_name|lower}}_idx++) begin : g_passthrough_{{child.inst_name|lower}}
-    assign {{cpuif.signal("PCLK", child, f"g_{child.inst_name.lower()}_idx")}}    = {{cpuif.signal("PCLK")}};
-    assign {{cpuif.signal("PRESETn", child, f"g_{child.inst_name.lower()}_idx")}} = {{cpuif.signal("PRESETn")}};
-    assign {{cpuif.signal("PSELx", child, f"g_{child.inst_name.lower()}_idx")}}    = (cpuif_wr_req[{{loop.indx}}] || cpuif_rd_req[{{loop.indx}}]) ? 1'b1 : 1'b0;
-    assign {{cpuif.signal("PENABLE", child, f"g_{child.inst_name.lower()}_idx")}} = {{cpuif.signal("PENABLE")}};
-    assign {{cpuif.signal("PWRITE", child, f"g_{child.inst_name.lower()}_idx")}}  = (cpuif_wr_req[{{loop.index}}]) ? 1'b1 : 1'b0;
-    assign {{cpuif.signal("PADDR", child, f"g_{child.inst_name.lower()}_idx")}}   = {{cpuif.get_address_slice(cpuif_wr_addr, child)}};
-    assign {{cpuif.signal("PWDATA", child, f"g_{child.inst_name.lower()}_idx")}}  = cpuif_wr_data;
+for (genvar g_idx = 0; g_idx < N_{{child.inst_name|upper}}S; g_idx++) begin : g_passthrough_{{child.inst_name|lower}}
+    assign {{cpuif.signal("PCLK", child, "g_idx")}}    = {{cpuif.signal("PCLK")}};
+    assign {{cpuif.signal("PRESETn", child, "g_idx")}} = {{cpuif.signal("PRESETn")}};
+    assign {{cpuif.signal("PSELx", child, "g_idx")}}    = (cpuif_wr_req[{{loop.index}}] || cpuif_rd_req[{{loop.index}}]) ? 1'b1 : 1'b0;
+    assign {{cpuif.signal("PENABLE", child, "g_idx")}} = {{cpuif.signal("PENABLE")}};
+    assign {{cpuif.signal("PWRITE", child, "g_idx")}}  = (cpuif_wr_req[{{loop.index}}]) ? 1'b1 : 1'b0;
+    assign {{cpuif.signal("PADDR", child, "g_idx")}}   = cpuif_wr_addr{{child|address_slice}};
+    assign {{cpuif.signal("PWDATA", child, "g_idx")}}  = cpuif_wr_data;
     assign cpuif_rd_ack[loop.index] = {{cpuif.signal("PREADY", child)}};
     assign cpuif_rd_data[loop.index] = {{cpuif.signal("PRDATA", child)}};
     assign cpuif_rd_err[loop.index] = {{cpuif.signal("PSLVERR", child)}};
@@ -34,13 +34,13 @@ assign {{cpuif.signal("PRESETn", child)}} = {{cpuif.signal("PRESETn")}};
 assign {{cpuif.signal("PSELx", child)}}    = (cpuif_wr_sel[{{loop.index0}}] || cpuif_rd_sel[{{loop.index0}}]) ? 1'b1 : 1'b0;
 assign {{cpuif.signal("PENABLE", child)}} = {{cpuif.signal("PENABLE")}};
 assign {{cpuif.signal("PWRITE", child)}}  = (cpuif_wr_req[{{loop.index}}]) ? 1'b1 : 1'b0;
-assign {{cpuif.signal("PADDR", child)}}   = {{cpuif.get_address_slice(cpuif_wr_addr, child)}};
+assign {{cpuif.signal("PADDR", child)}}   = cpuif_wr_addr{{child|address_slice}};
 assign {{cpuif.signal("PWDATA", child)}}  = cpuif_wr_data;
 assign cpuif_rd_ack[loop.index] = {{cpuif.signal("PREADY", child)}};
 assign cpuif_rd_data[loop.index] = {{cpuif.signal("PRDATA", child)}};
 assign cpuif_rd_err[loop.index] = {{cpuif.signal("PSLVERR", child)}};
 {%- endif -%}
-{%- endfor -%}
+{%- endfor%}
 
 always_comb begin
     {{cpuif.signal("PREADY")}} = 1'b0;

src/peakrdl_busdecoder/cpuif/base_cpuif.py

@@ -82,6 +82,7 @@ class BaseCpuif:
         jj_env.filters["clog2"] = clog2  # type: ignore
         jj_env.filters["is_pow2"] = is_pow2  # type: ignore
         jj_env.filters["roundup_pow2"] = roundup_pow2  # type: ignore
+        jj_env.filters["address_slice"] = self.get_address_slice  # type: ignore
 
         context = {
             "cpuif": self,
@@ -90,3 +91,34 @@ class BaseCpuif:
 
         template = jj_env.get_template(self.template_path)
         return template.render(context)
+
+    def get_address_slice(self, node: AddressableNode) -> str:
+        """
+        Returns a SystemVerilog expression that extracts the address bits
+        relevant to the given node.
+        """
+        addr_mask = (1 << self.addr_width) - 1
+        addr = node.absolute_address & addr_mask
+        size = node.size
+        if size == 0:
+            raise ValueError(f"Node size '{size:#X}' must be greater than 0")
+        if (addr % size) != 0:
+            raise ValueError(f"Node address '{addr:#X}' must be aligned to its size '{size:#X}'")
+
+        # Calculate the address range of the node
+        addr_start = addr
+        addr_end = addr + size - 1
+        if addr_end > addr_mask:
+            raise ValueError("Node address range exceeds address width")
+
+        # Calculate the number of bits needed to represent the size
+        size_bits = size.bit_length() - 1
+        if size_bits < 0:
+            size_bits = 0
+
+        if size_bits >= self.addr_width:
+            # Node covers entire address space, so return full address
+            return ""
+
+        # Extract the relevant bits from PADDR
+        return f"[{self.addr_width - 1}:{size_bits}]"

src/peakrdl_busdecoder/decoder.py

@@ -0,0 +1,132 @@
+from collections import deque
+
+from systemrdl.node import AddressableNode
+from systemrdl.walker import RDLListener, RDLSimpleWalker, WalkerAction
+
+from .body import Body, ForLoopBody, IfBody
+from .sv_int import SVInt
+
+
+class AddressDecode:
+    def __init__(self, node: AddressableNode, addr_width: int) -> None:
+        self._node = node
+        self._addr_width = addr_width
+
+    def walk(self) -> str:
+        walker = RDLSimpleWalker()
+        dlg = DecodeLogicGenerator(self)
+        walker.walk(self._node, dlg, skip_top=True)
+        return str(dlg)
+
+    @property
+    def node(self) -> AddressableNode:
+        return self._node
+
+    @property
+    def addr_width(self) -> int:
+        return self._addr_width
+
+
+class DecodeLogicGenerator(RDLListener):
+    cpuif_addr_signal = "addr"
+    cpuif_sel_prefix = "cpuif_"
+
+    def __init__(
+        self,
+        address_decoder: AddressDecode,
+        max_depth: int = 1,
+    ) -> None:
+        self._address_decoder = address_decoder
+        self._depth = 0
+        self._max_depth = max_depth
+
+        self._stack: list[Body] = [IfBody()]
+        self._conditions: deque[str] = deque()
+        self._select_signal = [f"{self.cpuif_sel_prefix}{address_decoder.node.inst_name}"]
+
+        # Stack to keep track of array strides for nested arrayed components
+        self._array_stride_stack: list[int] = []
+
+    def enter_AddressableComponent(self, node: AddressableNode) -> WalkerAction | None:
+        # Generate address bounds
+        addr_width = self._address_decoder.addr_width
+        l_bound = SVInt(
+            node.raw_absolute_address - self._address_decoder.node.raw_absolute_address,
+            addr_width,
+        )
+        u_bound = l_bound + SVInt(node.total_size, addr_width)
+
+        # Handle arrayed components
+        l_bound_str = str(l_bound)
+        u_bound_str = str(u_bound)
+        for i, stride in enumerate(self._array_stride_stack):
+            l_bound_str += f" + (({addr_width})'(i{i}) * {SVInt(stride, addr_width)})"
+            u_bound_str += f" + (({addr_width})'(i{i}) * {SVInt(stride, addr_width)})"
+
+        # Generate condition string
+        condition = (
+            f"({self.cpuif_addr_signal} >= ({l_bound_str})) && ({self.cpuif_addr_signal} < ({u_bound_str}))"
+        )
+
+        if node.array_dimensions:
+            assert node.array_stride is not None, "Array stride should be defined for arrayed components"
+            # Collect strides for each array dimension
+            current_stride = node.array_stride
+            strides: list[int] = []
+            for dim in reversed(node.array_dimensions):
+                strides.append(current_stride)
+                current_stride *= dim
+            strides.reverse()
+            self._array_stride_stack.extend(strides)
+
+        # Generate condition string and manage stack
+        signal = node.inst_name
+        if isinstance(self._stack[-1], IfBody) and node.array_dimensions:
+            # arrayed component with new if-body
+            self._conditions.append(condition)
+            for dim in node.array_dimensions:
+                fb = ForLoopBody(
+                    "int",
+                    f"i{self._depth}",
+                    dim,
+                )
+                self._stack.append(fb)
+                signal += f"[i{self._depth}]"
+                self._depth += 1
+
+            self._stack.append(IfBody())
+        elif isinstance(self._stack[-1], IfBody):
+            # non-arrayed component with if-body
+            with self._stack[-1].cm(condition) as b:
+                b += f"{'.'.join([*self._select_signal, signal])} = 1'b1;"
+        self._select_signal.append(signal)
+
+        # if node.external:
+        #     return WalkerAction.SkipDescendants
+
+        return WalkerAction.Continue
+
+    def exit_AddressableComponent(self, node: AddressableNode) -> None:
+        self._select_signal.pop()
+
+        if not node.array_dimensions:
+            return
+
+        ifb = self._stack.pop()
+        self._stack[-1] += ifb
+
+        for _ in node.array_dimensions:
+            self._depth -= 1
+
+            b = self._stack.pop()
+            if b.lines:
+                if isinstance(self._stack[-1], IfBody):
+                    with self._stack[-1].cm(self._conditions.pop()) as parent_b:
+                        parent_b += b
+                else:
+                    self._stack[-1] += b
+
+            self._array_stride_stack.pop()
+
+    def __str__(self) -> str:
+        return str(self._stack[-1])

src/peakrdl_busdecoder/dereferencer.py

@@ -1,41 +0,0 @@
-from typing import TYPE_CHECKING
-
-from systemrdl.node import AddressableNode, AddrmapNode, FieldNode, RegNode
-
-if TYPE_CHECKING:
-    from .addr_decode import AddressDecode
-    from .exporter import BusDecoderExporter, DesignState
-
-
-class Dereferencer:
-    """
-    This class provides an interface to convert conceptual SystemRDL references
-    into Verilog identifiers
-    """
-
-    def __init__(self, exp: "BusDecoderExporter") -> None:
-        self.exp = exp
-
-    @property
-    def address_decode(self) -> "AddressDecode":
-        return self.exp.address_decode
-
-    @property
-    def ds(self) -> "DesignState":
-        return self.exp.ds
-
-    @property
-    def top_node(self) -> AddrmapNode:
-        return self.exp.ds.top_node
-
-    def get_access_strobe(self, obj: RegNode | FieldNode, reduce_substrobes: bool = True) -> str:
-        """
-        Returns the Verilog string that represents the register's access strobe
-        """
-        return self.address_decode.get_access_strobe(obj, reduce_substrobes)
-
-    def get_external_block_access_strobe(self, obj: "AddressableNode") -> str:
-        """
-        Returns the Verilog string that represents the external block's access strobe
-        """
-        return self.address_decode.get_external_block_access_strobe(obj)

src/peakrdl_busdecoder/exporter.py

@@ -1,14 +1,15 @@
 import os
+from datetime import datetime
+from importlib.metadata import version
 from typing import TYPE_CHECKING, Any
 
 import jinja2 as jj
 from systemrdl.node import AddrmapNode, RootNode
 from systemrdl.rdltypes.user_enum import UserEnum
 
-from .addr_decode import AddressDecode
 from .cpuif import BaseCpuif
 from .cpuif.apb4 import APB4Cpuif
-from .dereferencer import Dereferencer
+from .decoder import AddressDecode
 from .identifier_filter import kw_filter as kwf
 from .scan_design import DesignScanner
 from .sv_int import SVInt
@@ -22,13 +23,12 @@ if TYPE_CHECKING:
 class BusDecoderExporter:
     cpuif: BaseCpuif
     address_decode: AddressDecode
-    dereferencer: Dereferencer
     ds: "DesignState"
 
     def __init__(self, **kwargs: Any) -> None:
         # Check for stray kwargs
         if kwargs:
-            raise TypeError(f"got an unexpected keyword argument '{list(kwargs.keys())[0]}'")
+            raise TypeError(f"got an unexpected keyword argument '{next(iter(kwargs.keys()))}'")
 
         loader = jj.ChoiceLoader(
             [
@@ -84,18 +84,19 @@ class BusDecoderExporter:
 
         # Check for stray kwargs
         if kwargs:
-            raise TypeError(f"got an unexpected keyword argument '{list(kwargs.keys())[0]}'")
+            raise TypeError(f"got an unexpected keyword argument '{next(iter(kwargs.keys()))}'")
 
         # Construct exporter components
         self.cpuif = cpuif_cls(self)
-        self.address_decode = AddressDecode(self)
-        self.dereferencer = Dereferencer(self)
+        self.address_decode = AddressDecode(top_node, self.ds.addr_width)
 
         # Validate that there are no unsupported constructs
         DesignValidator(self).do_validate()
 
         # Build Jinja template context
         context = {
+            "current_date": datetime.now().strftime("%Y-%m-%d"),
+            "version": version("peakrdl-busdecoder"),
             "cpuif": self.cpuif,
             "address_decode": self.address_decode,
             "ds": self.ds,
@@ -115,9 +116,6 @@ class BusDecoderExporter:
         stream = template.stream(context)
         stream.dump(module_file_path)
 
-        if hwif_report_file:
-            hwif_report_file.close()
-
 
 class DesignState:
     """
@@ -147,6 +145,9 @@ class DesignState:
         # Track any referenced enums
         self.user_enums: list[type[UserEnum]] = []
 
+        self.has_external_addressable = False
+        self.has_external_block = False
+
         # Scan the design to fill in above variables
         DesignScanner(self).do_scan()
 

src/peakrdl_busdecoder/forloop_generator.py

@@ -1,99 +0,0 @@
-import textwrap
-from typing import TYPE_CHECKING
-
-from systemrdl.walker import RDLListener, RDLWalker, WalkerAction
-
-if TYPE_CHECKING:
-    from systemrdl.node import AddressableNode, Node
-
-
-class Body:
-    def __init__(self) -> None:
-        self.children: list[str | Body] = []
-
-    def __str__(self) -> str:
-        s = "\n".join(str(x) for x in self.children)
-        return s
-
-
-class LoopBody(Body):
-    def __init__(self, dim: int, iterator: str, i_type: str) -> None:
-        super().__init__()
-        self.dim = dim
-        self.iterator = iterator
-        self.i_type = i_type
-
-    def __str__(self) -> str:
-        s = super().__str__()
-        return (
-            f"for({self.i_type} {self.iterator}=0; {self.iterator}<{self.dim}; {self.iterator}++) begin\n"
-            + textwrap.indent(s, "\t")
-            + "\nend"
-        )
-
-
-class ForLoopGenerator:
-    i_type = "int"
-    loop_body_cls = LoopBody
-
-    def __init__(self) -> None:
-        self._loop_level = 0
-        self._stack: list[Body] = []
-
-    @property
-    def current_loop(self) -> Body:
-        return self._stack[-1]
-
-    def push_loop(self, dim: int) -> None:
-        i = f"i{self._loop_level}"
-        b = self.loop_body_cls(dim, i, self.i_type)
-        self._stack.append(b)
-        self._loop_level += 1
-
-    def add_content(self, s: str) -> None:
-        self.current_loop.children.append(s)
-
-    def pop_loop(self) -> None:
-        b = self._stack.pop()
-
-        if b.children:
-            # Loop body is not empty. Attach it to the parent
-            self.current_loop.children.append(b)
-        self._loop_level -= 1
-
-    def start(self) -> None:
-        assert not self._stack
-        b = Body()
-        self._stack.append(b)
-
-    def finish(self) -> str | None:
-        b = self._stack.pop()
-        assert not self._stack
-
-        if not b.children:
-            return None
-        return str(b)
-
-
-class RDLForLoopGenerator(ForLoopGenerator, RDLListener):
-    def get_content(self, node: "Node") -> str | None:
-        self.start()
-        walker = RDLWalker()
-        walker.walk(node, self, skip_top=True)
-        return self.finish()
-
-    def enter_AddressableComponent(self, node: "AddressableNode") -> WalkerAction | None:
-        if not node.array_dimensions:
-            return None
-
-        for dim in node.array_dimensions:
-            self.push_loop(dim)
-        return None
-
-    def exit_AddressableComponent(self, node: "AddressableNode") -> WalkerAction | None:
-        if not node.array_dimensions:
-            return None
-
-        for _ in node.array_dimensions:
-            self.pop_loop()
-        return None

src/peakrdl_busdecoder/module_tmpl.sv

@@ -12,11 +12,11 @@
 
 
 module {{ds.module_name}}
-    {%- if cpuif.parameters %} #(
-        {{-cpuif.parameters|join(",\n")|indent(8)}}
-    ) {%- endif %} (
-        {{-cpuif.port_declaration|indent(8)}}
-    );
+{%- if cpuif.parameters %} #(
+    {{cpuif.parameters|join(",\n")|indent(4)}}
+) {%- endif %} (
+    {{cpuif.port_declaration|indent(4)}}
+);
 
     //--------------------------------------------------------------------------
     // CPU Bus interface logic

src/peakrdl_busdecoder/sv_int.py

@@ -13,3 +13,9 @@ class SVInt:
             return f"{self.value.bit_length()}'h{self.value:x}"
         else:
             return f"'h{self.value:x}"
+
+    def __add__(self, other: "SVInt") -> "SVInt":
+        if self.width is not None and other.width is not None:
+            return SVInt(self.value + other.value, max(self.width, other.width))
+        else:
+            return SVInt(self.value + other.value, None)