Verilog Syntax Issues Resolved

[Minchan-Kwon]

Fixed Verilog syntax errors for the benchmark suite to run.

Summary by CodeRabbit

• Bug Fixes

  • Corrected multiple syntax issues and an internal signal type to ensure generated designs compile and synthesize reliably.
  • Updated a clock reference used during instantiation for consistent hardware generation.

• New Features

  • Added two new generated modules for additional clock/test scenarios.

• Chores

  • Improved SDC generation tooling: more deterministic selections, stricter option validation, revised create_clock output formatting, and cleaner command assembly.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Small Verilog netlist fixes and additions (semicolon corrections, internal signal type change, one module instantiation swapped), two new netlist modules added, and a substantial refactor of the SDC generation script (option validation, selector syntax, and command assembly).

Changes

Cohort / File(s)	Change Summary
Semicolon / syntax fixes auto_generated/netlist_files/set_false_path_netlist.v, auto_generated/netlist_files/set_max_delay_netlist.v, auto_generated/netlist_files/set_min_delay_netlist.v, auto_generated/netlist_files/set_multicycle_path_netlist.v	Added missing trailing semicolons to non-blocking assignments inside always blocks; no behavioral changes.
Signal type & cleanup auto_generated/netlist_files/set_clock_uncertainty_netlist.v	Changed internal data_internal from wire to reg to match assignment inside an always block; removed a redundant always block.
Module instantiation change auto_generated/netlist_files/set_output_delay_netlist.v	Replaced instantiation module FF with FF_ref for the ff_ref instance; wiring/logic otherwise unchanged.
New netlist modules auto_generated/netlist_files/all_clocks_netlist.v, auto_generated/netlist_files/set_disable_timing_netlist.v	Added all_clocks (inputs clk1, clk2, D; output reg Q; clk2 unused) and set_disable_timing (module now declares clk1, D, Q and assigns Q on posedge clk1) netlists.
SDC generator overhaul scripts/generate_sdc.py	Extensive refactor: changed default PERIODS/PINS, switched many selectors to [get_*] syntax, tightened mutual-exclusion/validation for options, made deterministic pin/clock selection, adjusted waveform timing ordering, and changed generator command assembly and return shapes (e.g., create_clock prerequisites added).

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

• Focus review on scripts/generate_sdc.py: option mutual-exclusion, selector/[get_*] correctness, and the altered generator outputs (ensure callers/consumers accept new command shapes).
• Verify new netlist modules for declared/used signals (e.g., all_clocks clk2 unused; set_disable_timing declares clk1 in this diff).
• Confirm FF → FF_ref instantiation matches available module definitions.
• Quick pass on semicolon fixes in netlists (low risk).

Poem

🐇 I hopped through netlists, tail a-fluff,
Semicolons settled — not one too rough.
A wire became reg, a clock found place,
Scripts rearranged with tidy grace.
Happy hops — SDCs embrace! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the primary focus of the changeset: fixing Verilog syntax errors across multiple netlist files and related script adjustments.
Docstring Coverage	✅ Passed	Docstring coverage is 92.86% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between aa0e6bb and 6c82768.

📒 Files selected for processing (6)

• auto_generated/netlist_files/set_clock_uncertainty_netlist.v (2 hunks)
• auto_generated/netlist_files/set_false_path_netlist.v (1 hunks)
• auto_generated/netlist_files/set_max_delay_netlist.v (1 hunks)
• auto_generated/netlist_files/set_min_delay_netlist.v (1 hunks)
• auto_generated/netlist_files/set_multicycle_path_netlist.v (1 hunks)
• auto_generated/netlist_files/set_output_delay_netlist.v (1 hunks)

🔇 Additional comments (6)

auto_generated/netlist_files/set_max_delay_netlist.v (1)

48-51: LGTM!

The missing semicolons have been correctly added to terminate the non-blocking assignments in the always block. This is a necessary Verilog syntax fix.

auto_generated/netlist_files/set_multicycle_path_netlist.v (1)

48-51: LGTM!

Correct syntax fix - semicolons added to terminate the procedural assignments.

auto_generated/netlist_files/set_false_path_netlist.v (1)

48-51: LGTM!

Correct syntax fix - semicolons properly terminate the non-blocking assignments in the always block.

auto_generated/netlist_files/set_min_delay_netlist.v (1)

48-51: LGTM!

Correct syntax fix - semicolons added to terminate the procedural assignments.

auto_generated/netlist_files/set_output_delay_netlist.v (1)

21-21: LGTM!

The instantiation now correctly references module FF_ref (defined at line 38) instead of the non-existent FF. This fix resolves the module elaboration error while maintaining all port connections.

auto_generated/netlist_files/set_clock_uncertainty_netlist.v (1)

22-22: Correct fix: wire to reg conversion.

The change from wire to reg is necessary because data_internal is assigned inside an always block (line 25). This is a required syntax correction.

[coderabbitai]

Actionable comments posted: 5

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

scripts/generate_sdc.py (1)

682-710: Bug: to_obj uses through_list instead of to_list.

to_list is defined on line 684 but never used. On line 710, to_obj is assigned from through_list instead of to_list. This appears to be a copy-paste error that affects the correctness of generated -to options.

-            to_obj = random.choice(through_list)
+            to_obj = random.choice(to_list)

🧹 Nitpick comments (1)

scripts/generate_sdc.py (1)

426-432: Remove extraneous f prefix from strings without placeholders.

These f-strings have no placeholders and don't need the f prefix:

• Line 426: f"-clock [get_clocks src_clk]" → "-clock [get_clocks src_clk]"
• Line 432: f"-reference_pin [get_pins ff_ref/clk]" → "-reference_pin [get_pins ff_ref/clk]"

This pattern repeats in multiple places (lines 496, 503, 567, 630, 634, 638, 642, 646, 650, 1200, 1204).

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 6c82768 and 0e603cf.

📒 Files selected for processing (4)

• auto_generated/netlist_files/all_clocks_netlist.v (1 hunks)
• auto_generated/netlist_files/set_clock_uncertainty_netlist.v (1 hunks)
• auto_generated/netlist_files/set_disable_timing_netlist.v (1 hunks)
• scripts/generate_sdc.py (23 hunks)

🧰 Additional context used

🪛 Ruff (0.14.6)

scripts/generate_sdc.py

220-220: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

221-221: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

229-229: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

426-426: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

432-432: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

443-443: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

496-496: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

503-503: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

514-514: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

546-546: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

550-550: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

567-567: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

630-630: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

634-634: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

638-638: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

642-642: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

646-646: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

650-650: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

684-684: Local variable to_list is assigned to but never used

Remove assignment to unused variable to_list

(F841)

---

778-778: Local variable to_list is assigned to but never used

Remove assignment to unused variable to_list

(F841)

---

798-798: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

802-802: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

803-803: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

804-804: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

872-872: Local variable to_list is assigned to but never used

Remove assignment to unused variable to_list

(F841)

---

893-893: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

897-897: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

898-898: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

899-899: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

966-966: Local variable to_list is assigned to but never used

Remove assignment to unused variable to_list

(F841)

---

972-972: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

994-994: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

995-995: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

996-996: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

1196-1196: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

1200-1200: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

1204-1204: f-string without any placeholders

Remove extraneous f prefix

(F541)

🔇 Additional comments (4)

auto_generated/netlist_files/set_clock_uncertainty_netlist.v (1)

22-22: Correct fix: data_internal must be reg for procedural assignment.

The change from wire to reg is necessary since data_internal is assigned inside an always block (line 25). The removal of the redundant always block (mentioned in the summary) also resolves the prior multi-driver concern.

scripts/generate_sdc.py (3)

591-612: Good addition of mutual exclusion validation.

The new logic properly enforces mutual exclusivity constraints:

• Only one -from variant allowed
• Only one -to variant allowed
• Both from and to must be present together (or neither)
• objects cannot be combined with from options

---

1179-1187: Good addition of exclusive options validation.

The new logic correctly enforces that -divide_by, -multiply_by, and -edges are mutually exclusive, which aligns with SDC specification.

---

1373-1384: Good addition of mutual exclusion validation for all_registers.

The logic correctly enforces that return type options (-cells, -data_pins, -clock_pins, -async_pins, -output_pins) are mutually exclusive, and that -level_sensitive and -edge_triggered cannot be combined.

[coderabbitai]

⚠️ Potential issue | 🔴 Critical

Syntax error: Trailing comma in port list.

The trailing comma after output reg Q, on line 15 will cause a Verilog compilation error. Also note that clk2 is declared but unused in the module logic (this may be intentional for SDC testing purposes).

 module all_clocks(
     input wire clk1,
     input wire clk2,
     input wire D,
-    output reg Q,
+    output reg Q
 );

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	module all_clocks(
	input wire clk1,
	input wire clk2,
	input wire D,
	output reg Q,
	);
	module all_clocks(
	input wire clk1,
	input wire clk2,
	input wire D,
	output reg Q
	);

🤖 Prompt for AI Agents

In auto_generated/netlist_files/all_clocks_netlist.v around lines 10 to 15,
remove the trailing comma after "output reg Q," in the module port list to fix
the Verilog syntax error; additionally, either remove the declared but unused
"clk2" port if it's not needed, or document/annotate its intentional unused
status (or wire it into the design) to avoid lint/compile warnings.

[coderabbitai]

Actionable comments posted: 0

♻️ Duplicate comments (2)

scripts/generate_sdc.py (2)

668-763: set_false_path: to_obj bug fixed and exclusivity constraints added

This now correctly selects to_obj from to_list (rather than through_list as previously flagged) and enforces at most one from*, through*, and to* variant per command, which matches the intended semantics for mutually exclusive variants.

---

858-951: set_min_delay mirrors set_max_delay logic correctly

The structure and mutual exclusion checks are consistent with set_max_delay, and to_obj is now chosen from to_list as intended. This keeps the min/max delay generators in sync and fixes the earlier to_obj selection issue.

🧹 Nitpick comments (6)

scripts/generate_sdc.py (6)

455-524: set_output_delay option guards mirror input-delay behavior appropriately

The same mutual-exclusion rules as set_input_delay are now applied here, and the fixed -clock [get_clocks src_clk] / -reference_pin [get_pins ff_ref/clk] choices are coherent with the clock and FF naming used elsewhere. One tiny nit: clk = random.choice(CLOCKS) is now unused and can be dropped as dead code if you want to keep linters quiet later.

---

526-577: Consider making set_clock_latency syntax closer to canonical SDC

Spec examples typically use set_clock_latency -source <latency> [get_clocks {clk}], i.e., options first, then latency, then clocks. (mithro-vtr.readthedocs.io)
Your generator currently emits set_clock_latency <delay> <object> [-source] ..., which may still parse on tolerant engines but is non‑canonical and could be less portable across SDC implementations.

If you care about portability, I’d suggest reordering to something like:

pieces = ["set_clock_latency"]
if "-source" in option_combination:
    pieces.append("-source")
# other flags...
pieces.append(str(delay))
pieces.append(random.choice(CLOCKS))  # or CLOCKS+PINS+PORTS for the target list

Please confirm against your target STA engine (e.g., OpenSTA/TimeQuest/VPR) whether the current ordering is accepted, and adjust if needed.

---

579-667: New mutual-exclusion logic in set_clock_uncertainty is a good step; consider tightening object rules

The from_options/to_options counting avoids mixing multiple from/to variants and prevents “half-specified” from/to (only one side set), which aligns with typical clock‑to‑clock uncertainty usage. (mithro-vtr.readthedocs.io)

Given you already block objects when any -from* is present, you may want to also block objects when any -to* is present for symmetry, unless you explicitly rely on set_clock_uncertainty -to ... <uncertainty> [objects] forms. That would look like:

if "objects" in option_combination and (from_count > 0 or to_count > 0):
    continue

---

764-856: set_max_delay mutual-exclusion logic is solid; option semantics could be tightened further

The new from_options/through_options/to_options counting ensures only one variant from each family is present, which prevents invalid mixes like -from + -rise_from. That’s a clear improvement.

The docstring says -rise/-fall “can only be used with plain -to, -from, -through.” Right now, combinations like -rise with -rise_from are still possible. If your target STA treats those as illegal or ambiguous, you might want an extra guard that skips any combination where -rise/-fall co‑occurs with -rise_*/-fall_* variants.

---

953-1054: set_multicycle_path: exclusivity checks look good; review multiplier placement and option conflicts

The new from_options/through_options/to_options mutual-exclusion logic, plus the -start/-end conflict check, is a nice improvement and avoids many invalid combinations.

Two things to double‑check:

1. multiplier is chosen once per generate_set_multicycle_path() call, so every emitted command in that run shares the same multicycle factor. If you intended to vary multipliers per combination, move the multiplier = random.choice(DIVISORS) inside the inner loop.
2. The docstring says -setup/-hold and -rise/-fall are mutually exclusive, but the current logic doesn’t enforce that. If your STA tool is strict about those being alternatives, you may want to skip combinations containing both flags.

---

1511-1517: Narrowed default command_list to path-based generators

Commenting out the broad command_list and using ["set_false_path", "set_min_delay", "set_max_delay", "set_multicycle_path"] by default is reasonable given the new netlist focus. Just be aware that other generators (e.g., create_clock, set_clock_uncertainty) are still wired into GENERATORS; if you later want coverage for them, you’ll need to re-expand command_list in your driver script or here.

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0e603cf and 3f5aeaf.

📒 Files selected for processing (3)

• auto_generated/netlist_files/all_clocks_netlist.v (1 hunks)
• auto_generated/netlist_files/set_disable_timing_netlist.v (1 hunks)
• scripts/generate_sdc.py (23 hunks)

🚧 Files skipped from review as they are similar to previous changes (2)

• auto_generated/netlist_files/all_clocks_netlist.v
• auto_generated/netlist_files/set_disable_timing_netlist.v

🧰 Additional context used

🪛 Ruff (0.14.6)

scripts/generate_sdc.py

220-220: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

221-221: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

229-229: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

426-426: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

432-432: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

443-443: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

496-496: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

503-503: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

514-514: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

546-546: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

550-550: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

567-567: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

630-630: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

634-634: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

638-638: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

642-642: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

646-646: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

650-650: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

708-708: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

709-709: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

710-710: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

798-798: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

802-802: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

803-803: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

804-804: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

893-893: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

897-897: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

898-898: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

899-899: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

972-972: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

994-994: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

995-995: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

996-996: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

1196-1196: Standard pseudo-random generators are not suitable for cryptographic purposes

(S311)

---

1200-1200: f-string without any placeholders

Remove extraneous f prefix

(F541)

---

1204-1204: f-string without any placeholders

Remove extraneous f prefix

(F541)

🔇 Additional comments (6)

scripts/generate_sdc.py (6)

24-32: Updated PERIODS/PINS/PORTS/CLOCKS constants look consistent with get_ usage*

The new value ranges and explicit [get_* …] forms align with how the generators build SDC commands and with the updated netlists; no issues from a generation/coverage perspective.

---

198-234: generate_create_clock changes look good

Using {5, 10, 20} for PERIODS, random but bounded rise_time/fall_time, and explicit pin forms in pin_list all produce plausible create_clock calls and remain structurally valid. No further changes needed here.

---

385-454: Stronger validation for set_input_delay combinations is correct

The new guards (requiring -clock when -clock_fall is present, making -max/-min mutually exclusive, and disallowing -reference_pin together with latency options) match common SDC expectations and avoid obviously invalid combinations. The fixed -clock and -reference_pin object choices also look consistent with the new netlists.

---

1173-1242: create_generated_clock: exclusive options and pin selection look consistent

Limiting -divide_by/-multiply_by/-edges to at most one per command matches SDC expectations, and using [get_pins reg0/clk] plus a -source pointing to either a port or MMCM input produces realistic generated-clock scenarios. The added create_clock prerequisite for src_clk is also consistent with the rest of the script.

---

1306-1307: all_clocks now emits prerequisite create_clock calls explicitly

Returning a single multi-line string with two create_clock definitions followed by all_clocks matches the updated netlists and ensures the clocks exist before all_clocks is referenced. This is a sensible change.

---

1366-1407: all_registers: new exclusivity checks match the documented intent

The return_type_options counting correctly enforces that only one of -cells/-data_pins/-clock_pins/-async_pins/-output_pins is present, and the additional guard preventing simultaneous -level_sensitive and -edge_triggered flags matches the docstring. This should prevent a lot of invalid SDC from being generated.

[AlexandreSinger]

LGTM