ROLLOUT 3 · amaranth-lang/amaranth
amaranth-lang__amaranth-923
Not solved
453 stotal time
23tool calls
23model calls
6,764tokens generated
164,308prompt tokens read
Empty agent patch
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System instructions 4,822 characters
You are a principal Python software engineer resolving a repository issue in `/workspace`. Your sole objective is to produce a minimal, root-cause source patch that passes every hidden fail-to-pass and pass-to-pass regression test on the first grading run. ## Critical Environment & Grader Rules 1. **Air-Gapped Sandbox & Available CLI Tools**: No network access. Never run `pip`, `uv`, `conda`, or `git fetch`. Note: `rg` (`ripgrep`) is NOT installed in the container — always use `grep -rn --include="*.py"` for fast exact searches so you never waste a tool call on `command not found`. 2. **Protected Grading Paths**: Before running official verification, the grading harness **strips and reverts all changes** to `tests/`, `test/`, `testing/`, `test_*.py`, `*_test.py`, `conftest.py`, `pyproject.toml`, `setup.cfg`, `pytest.ini`, and `tox.ini`. Every part of your fix MUST reside in non-test production source files. 3. **Untracked File Trap (`git add -N .`)**: `submit_patch` stages ALL untracked files inside `/workspace`! Never leave reproduction or scratch files inside `/workspace` — run reproductions inline via `python3 - <<'PY'` or inside `/tmp/repro.py` in a single `run_command`. 4. **Stdout Truncation Rule**: `run_command` truncates stdout after the first 5,000 characters from the TOP. Always run pytest quietly with short tracebacks: `pytest path/to/test_file.py -k pattern -q --tb=short --no-header` If a test file is large, redirect output to `/tmp/pytest.log` and inspect `tail -n 80 /tmp/pytest.log` so failure tracebacks at the bottom are never cut off. 5. **Strict Pacing Discipline**: `get_status` and `submit_patch` are free and do NOT count toward `max_tool_calls`. Target **16-22 counted tool calls total**, and **begin your first `edit_file` change no later than tool call 15**. Reserve at least 4 calls for verification, `git status --short && git diff`, and submission. ## Execution Protocol ### Phase 1 — Pinpoint Code & Tests Immediately (1-2 tool calls) - The user message already contains `Workspace Layout` — do NOT waste a turn running `ls` on top-level directories. - Run a single compound `run_command` with `grep -rn --include="*.py"` to locate: (a) the exact symbols, error strings, or functions from the problem description, (b) **all parallel or sibling implementations** (for example sync + async variants, `Client` + `AsyncClient`, serializer + deserializer, multiple backends/dialects, base + subclass methods, `__init__.py` / `__all__` exports), and (c) the closest existing unit test files under `tests/`. ### Phase 2 — Deep Read & Spec Anchor (2-5 tool calls) - Use `read_file` with generous `start_line` and `end_line` windows (180-300 lines per call so you read whole modules in fewer calls) on the target function/class, callers, type annotations, and neighboring tests. - Before editing, verify every explicit and implicit requirement from the issue: exact parameter names, defaults, boundary/domain edge cases, exception types/messages, `None` vs empty collection vs falsy (`0`, `False`, `""`) semantics, mutability/copying, and return types. ### Phase 3 — Reproduce Bug in One Call (1 tool call) - Run ONE concise command (`python3 - <<'PY' ... PY` or targeted `pytest ... -q --tb=short --no-header`) via `run_command` to observe the exact pre-fix failure. Do NOT spend multiple tool calls writing separate reproduction scripts. ### Phase 4 — Surgical Implementation Across All Parallel Paths (1-4 tool calls) - Begin editing by tool call 15! Use `edit_file` with 4-6 lines of exact surrounding context copied from `read_file`. - Update ALL parallel codepaths (sync/async, multiple classes/dialects, type hints) consistently so partial fixes do not fail sibling tests. - **2-Strike Edit Rule**: If `edit_file` fails twice on the same block due to whitespace or escaping, do not retry `edit_file` a third time — apply an atomic Python transformation via `run_command` and immediately verify `python3 -m py_compile path/to/file.py`. ### Phase 5 — Edge-Case Verification, Diff Hygiene & Clean Exit (2-4 tool calls) - Run a single compound `run_command` testing both your reproduction + boundary edge cases (`None`, empty input, leading/trailing delimiters, subdomain/prefix boundaries, subclass/async parity) AND the relevant existing `pytest` module(s) with `-q --tb=short --no-header`. - Run `git status --short && git diff` via `run_command`. Confirm: - ZERO untracked (`??`) files in `/workspace` (`rm -f` any untracked workspace files immediately), - ZERO modifications to `tests/` or protected config files (`git checkout -- tests/` if touched), - Minimal, clean diff with valid imports and indentation. - Call `submit_patch` once verification passes, then respond with a brief 2-sentence plain-text summary and make NO further tool calls.
Task prompt 5,653 characters
You are evaluating a software engineering task for repository amaranth-lang/amaranth.
Problem Statement:
Issue with `Memory` simulation
Hi,
we are currently updating Amaranth version in Coreblocks (https://github.com/kuznia-rdzeni/coreblocks/pull/461) and unexpectedly some unit tests started to fail. Part of failing unit tests check the whole core on assembler programs. Similar tests using Cocotb and Verilator passed successfully, so I assume some problems with simulation inside Amaranth (as unit tests use amaranth tests framework). After some investigation it looks like the issue is related #893. Here is a reproduction example:
```py
class MemoryReproduce(TestCaseWithSimulator):
class DUT(Elaboratable):
def __init__(self):
pass
def elaborate(self, platform):
m = Module()
self.mem = Memory(width=8, depth=8)
m.submodules.read_port = self.read_port = self.mem.read_port()
m.submodules.write_port = self.write_port = self.mem.write_port()
return m
def test_minimal(self):
m = self.DUT()
def process():
yield m.read_port.addr.eq(1)
yield m.read_port.en.eq(1)
yield
print((yield m.read_port.data))
yield
yield m.write_port.addr.eq(2)
yield m.write_port.data.eq(14)
yield m.write_port.en.eq(1)
print((yield m.read_port.data))
yield
yield m.write_port.en.eq(0)
print((yield m.read_port.data))
yield
print((yield m.read_port.data))
yield
print((yield m.read_port.data))
with self.run_simulation(m) as sim:
sim.add_sync_process(process)
```
Output for this test case:
```
0
0
0
14
0
```
Idea is that we try to read memory from the one address and write to the other one. So we expect that writing has no impact on reading. But as you can see that is not a case in Amaranth simulation. Write cause that on read data output port there is visible written value for one cycle.
## Task Budget (Session terminates when any budget is exhausted)
- Time allowance: 7.5 minutes
- Tool calls allowance: 30 calls
- Max loop iterations: 40 turns
## Execution Environment Rules
- Single command timeout: 90 seconds (commands exceeding this fail without ending the session)
- Command output limit: 5000 characters
- File view limit: 150 lines per read_file call
- File character limit: 10000 characters per read_file call
- Environment is offline (no network/PyPI access). All repository and test dependencies are ALREADY pre-installed. Do NOT attempt to run pip install or download packages.
## Instructions:
0. All source code is under `/workspace`. Do NOT search outside `/workspace` (e.g. `/usr/`, `/wheels/`, system site-packages). If imports fail, the issue is in the source code under `/workspace`, not in missing system packages.
1. Analyze the problem statement and any provided hints carefully to identify all requested script paths, CLI subcommands, or Python modules.
2. Inspect existing codebase conventions and test files before making edits.
3. Verify your implementation using targeted tests or inline assertions before submitting.
4. Call submit_patch only after your implementation is complete and verified.
5. As your final action, you must return a text-only response reporting your completion to terminate the session.
## Workspace Layout
The repository is located at `/workspace`. Here is the directory tree (up to 3 levels):
```
./CONTRIBUTING.txt
./LICENSE.txt
./README.md
./amaranth
./amaranth/__init__.py
./amaranth/_toolchain
./amaranth/_toolchain/__init__.py
./amaranth/_toolchain/yosys.py
./amaranth/_unused.py
./amaranth/_utils.py
./amaranth/asserts.py
./amaranth/back
./amaranth/back/__init__.py
./amaranth/back/cxxrtl.py
./amaranth/back/rtlil.py
./amaranth/back/verilog.py
./amaranth/build
./amaranth/build/__init__.py
./amaranth/build/dsl.py
./amaranth/build/plat.py
./amaranth/build/res.py
./amaranth/build/run.py
./amaranth/cli.py
./amaranth/compat
./amaranth/compat/__init__.py
./amaranth/compat/fhdl
./amaranth/compat/genlib
./amaranth/compat/sim
./amaranth/hdl
./amaranth/hdl/__init__.py
./amaranth/hdl/_rec.py
./amaranth/hdl/ast.py
./amaranth/hdl/cd.py
./amaranth/hdl/dsl.py
./amaranth/hdl/ir.py
./amaranth/hdl/mem.py
./amaranth/hdl/rec.py
./amaranth/hdl/xfrm.py
./amaranth/lib
./amaranth/lib/__init__.py
./amaranth/lib/cdc.py
./amaranth/lib/coding.py
./amaranth/lib/crc
./amaranth/lib/data.py
./amaranth/lib/enum.py
./amaranth/lib/fifo.py
./amaranth/lib/io.py
./amaranth/lib/scheduler.py
./amaranth/lib/wiring.py
./amaranth/rpc.py
./amaranth/sim
./amaranth/sim/__init__.py
./amaranth/sim/_base.py
./amaranth/sim/_pyclock.py
./amaranth/sim/_pycoro.py
./amaranth/sim/_pyrtl.py
./amaranth/sim/core.py
./amaranth/sim/pysim.py
./amaranth/tracer.py
./amaranth/utils.py
./amaranth/vendor
./amaranth/vendor/__init__.py
./amaranth/vendor/_gowin.py
./amaranth/vendor/_intel.py
./amaranth/vendor/_lattice_ecp5.py
./amaranth/vendor/_lattice_ice40.py
./amaranth/vendor/_lattice_machxo_2_3l.py
./amaranth/vendor/_quicklogic.py
./amaranth/vendor/_xilinx.py
./amaranth/vendor/gowin.py
./amaranth/vendor/intel.py
./amaranth/vendor/lattice_ecp5.py
./amaranth/vendor/lattice_ice40.py
./amaranth/vendor/lattice_machxo_2_3l.py
./amaranth/vendor/quicklogic.py
./amaranth/vendor/xilinx.py
./docs
./examples
./pdm_build.py
./pyproject.toml
./tests
```
Turn 1at 68 s1,198 tokens out3,835 prompt tokens
The user is reporting an issue with `Memory` simulation in Amaranth.
Writing to one memory address seems to affect reading from another address for one cycle in the simulation.
The provided reproduction code:
```py
class MemoryReproduce(TestCaseWithSimulator):
class DUT(Elaboratable):
def __init__(self):
pass
def elaborate(self, platform):
m = Module()
self.mem = Memory(width=8, depth=8)
m.submodules.read_port = self.read_port = self.mem.read_port()
m.submodules.write_port = self.write_port = self.mem.write_port()
return m
def test_minimal(self):
m = self.DUT()
def process():
yield m.read_port.addr.eq(1)
yield m.read_port.en.eq(1)
yield
print((yield m.read_port.data))
yield
yield m.write_port.addr.eq(2)
yield m.write_port.data.eq(14)
yield m.write_port.en.eq(1)
print((yield m.read_port.data))
yield
yield m.write_port.en.eq(0)
print((yield m.read_port.data))
yield
print((yield m.read_port.data))
yield
print((yield m.read_port.data))
with self.run_simulation(m) as sim:
sim.add_sync_process(process)
```
Expected output:
The memory is initialized to 0.
1. read addr 1: 0
2. write addr 2, data 14: read addr 1 should still be 0.
3. write en 0: read addr 1 should still be 0.
...
So expected is 0, 0, 0, 0, 0.
Actual output:
0
0
0
14
0
Wait, the reported output is:
0
0
0
14
0
Let's re-examine the `process()`:
```py
def process():
yield m.read_port.addr.eq(1) # cycle 0
yield m.read_port.en.eq(1) # cycle 0
yield # end of cycle 0, start of cycle 1
print((yield m.read_port.data)) # cycle 1: read data from addr 1 (should be 0)
yield # end of cycle 1, start of cycle 2
yield m.write_port.addr.eq(2) # cycle 2
yield m.write_port.data.eq(14) # cycle 2
yield m.write_port.en.eq(1) # cycle 2
print((yield m.read_port.data)) # cycle 2: read data from addr 1 (should be 0)
yield # end of cycle 2, start of cycle 3
yield m.write_port.en.eq(0) # cycle 3
print((yield m.read_port.data)) # cycle 3: read data from addr 1 (should be 0)
yield # end of cycle 3, start of cycle 4
print((yield m.read_port.data)) # cycle 4: read data from addr 1 (should be 0)
yield # end of cycle 4, start of cycle 5
print((yield m.read_port.data)) # cycle 5: read data from addr 1 (should be 0)
```
Wait, the reported output has 5 prints.
1st print: cycle 1.
2nd print: cycle 2.
3rd print: cycle 3.
4th print: cycle 4.
5th print: cycle 5.
Output:
0 (cycle 1)
0 (cycle 2)
0 (cycle 3)
14 (cycle 4)
0 (cycle 5)
Actually, let's look at the reported output again:
0
0
0
14
0
Wait, my cycle counting might be slightly off depending on how `yield` works in the simulator.
In Amaranth's `sim`, `yield` usually advances by one clock cycle if it's a sync process.-
Wait, `sim.add_sync_process(process)`. In a sync process, `yield` is used for signaling and waiting for the next clock edge.
Let's run the reproduction and see.
I need to find where `Memory` is implemented and how it's simulated.
`amaranth/hdl/mem.py` seems to be the place for `Memory` definition.
`amaranth/sim/_pyrtl.py` might contain the simulation logic for memory.
Phase 1: Locate symbols.
TOOL CALL · run_command
{
"command": "grep -rn --include=\"*.py\" \"Memory\" amaranth/hdl/mem.py amaranth/sim/_pyrtl.py"
}Result of run_command 995 characters
{
"status": "ok",
"stdout": "amaranth/hdl/mem.py:9:__all__ = [\"Memory\", \"ReadPort\", \"WritePort\", \"DummyPort\"]\namaranth/hdl/mem.py:12:class Memory(Elaboratable):\namaranth/hdl/mem.py:40: raise TypeError(\"Memory width must be a non-negative integer, not {!r}\"\namaranth/hdl/mem.py:43: raise TypeError(\"Memory depth must be a non-negative integer, not {!r}\"\namaranth/hdl/mem.py:72: raise ValueError(\"Memory initialization value count exceed memory depth ({} > {})\"\namaranth/hdl/mem.py:82: raise TypeError(\"Memory initialization value at address {:x}: {}\"\namaranth/hdl/mem.py:217: memory : :class:`Memory`\namaranth/hdl/mem.py:218: Memory associated with the port.\namaranth/hdl/mem.py:229: memory : :class:`Memory`\namaranth/hdl/mem.py:275: memory : :class:`Memory`\namaranth/hdl/mem.py:276: Memory associated with the port.\namaranth/hdl/mem.py:285: memory : :class:`Memory`\n",
"stderr": "",
"exit_code": 0
}Generated tokens 1,198 tokens · stopped: STOP
<|channel>thought
The user is reporting an issue with `Memory` simulation in Amaranth.
Writing to one memory address seems to affect reading from another address for one cycle in the simulation.
The provided reproduction code:
```py
class MemoryReproduce(TestCaseWithSimulator):
class DUT(Elaboratable):
def __init__(self):
pass
def elaborate(self, platform):
m = Module()
self.mem = Memory(width=8, depth=8)
m.submodules.read_port = self.read_port = self.mem.read_port()
m.submodules.write_port = self.write_port = self.mem.write_port()
return m
def test_minimal(self):
m = self.DUT()
def process():
yield m.read_port.addr.eq(1)
yield m.read_port.en.eq(1)
yield
print((yield m.read_port.data))
yield
yield m.write_port.addr.eq(2)
yield m.write_port.data.eq(14)
yield m.write_port.en.eq(1)
print((yield m.read_port.data))
yield
yield m.write_port.en.eq(0)
print((yield m.read_port.data))
yield
print((yield m.read_port.data))
yield
print((yield m.read_port.data))
with self.run_simulation(m) as sim:
sim.add_sync_process(process)
```
Expected output:
The memory is initialized to 0.
1. read addr 1: 0
2. write addr 2, data 14: read addr 1 should still be 0.
3. write en 0: read addr 1 should still be 0.
...
So expected is 0, 0, 0, 0, 0.
Actual output:
0
0
0
14
0
Wait, the reported output is:
0
0
0
14
0
Let's re-examine the `process()`:
```py
def process():
yield m.read_port.addr.eq(1) # cycle 0
yield m.read_port.en.eq(1) # cycle 0
yield # end of cycle 0, start of cycle 1
print((yield m.read_port.data)) # cycle 1: read data from addr 1 (should be 0)
yield # end of cycle 1, start of cycle 2
yield m.write_port.addr.eq(2) # cycle 2
yield m.write_port.data.eq(14) # cycle 2
yield m.write_port.en.eq(1) # cycle 2
print((yield m.read_port.data)) # cycle 2: read data from addr 1 (should be 0)
yield # end of cycle 2, start of cycle 3
yield m.write_port.en.eq(0) # cycle 3
print((yield m.read_port.data)) # cycle 3: read data from addr 1 (should be 0)
yield # end of cycle 3, start of cycle 4
print((yield m.read_port.data)) # cycle 4: read data from addr 1 (should be 0)
yield # end of cycle 4, start of cycle 5
print((yield m.read_port.data)) # cycle 5: read data from addr 1 (should be 0)
```
Wait, the reported output has 5 prints.
1st print: cycle 1.
2nd print: cycle 2.
3rd print: cycle 3.
4th print: cycle 4.
5th print: cycle 5.
Output:
0 (cycle 1)
0 (cycle 2)
0 (cycle 3)
14 (cycle 4)
0 (cycle 5)
Actually, let's look at the reported output again:
0
0
0
14
0
Wait, my cycle counting might be slightly off depending on how `yield` works in the simulator.
In Amaranth's `sim`, `yield` usually advances by one clock cycle if it's a sync process.-
Wait, `sim.add_sync_process(process)`. In a sync process, `yield` is used for signaling and waiting for the next clock edge.
Let's run the reproduction and see.
I need to find where `Memory` is implemented and how it's simulated.
`amaranth/hdl/mem.py` seems to be the place for `Memory` definition.
`amaranth/sim/_pyrtl.py` might contain the simulation logic for memory.
Phase 1: Locate symbols.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn --include="*.py" "Memory" amaranth/hdl/mem.py amaranth/sim/_pyrtl.py<|"|>}<tool_call|><|tool_response>
Turn 2at 72 s66 tokens out5,382 prompt tokens
The `grep` didn't show `Memory` in `amaranth/sim/_pyrtl.py`. Let me search for `Memory` in all of `amaranth/sim`.
TOOL CALL · run_command
{
"command": "grep -rn \"Memory\" amaranth/sim/"
}Result of run_command 127 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "",
"details": {
"stdout": "",
"stderr": "",
"exit_code": 1
}
}Generated tokens 66 tokens · stopped: STOP
The `grep` didn't show `Memory` in `amaranth/sim/_pyrtl.py`. Let me search for `Memory` in all of `amaranth/sim`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "Memory" amaranth/sim/<|"|>}<tool_call|><|tool_response>
Turn 3at 80 s157 tokens out5,503 prompt tokens
Wait, `grep -rn "Memory" amaranth/sim/` failed? That's strange. Maybe it's called something else in the simulator. Let's look at `amaranth/hdl/mem.py` to see how `Memory` is structured and how it's supposed to be simulated. Also, I want to check `amaranth/sim/_pyrtl.py` for any memory-like simulation. Wait, maybe it's `PyMemory` or something? Let's search for "mem" in `amaranth/sim`.
TOOL CALL · run_command
{
"command": "grep -rn \"mem\" amaranth/sim/ | head -n 20"
}Result of run_command 60 characters
{
"status": "ok",
"stdout": "",
"stderr": "",
"exit_code": 0
}Generated tokens 157 tokens · stopped: STOP
Wait, `grep -rn "Memory" amaranth/sim/` failed? That's strange. Maybe it's called something else in the simulator.
Let's look at `amaranth/hdl/mem.py` to see how `Memory` is structured and how it's supposed to be simulated.
Also, I want to check `amaranth/sim/_pyrtl.py` for any memory-like simulation.
Wait, maybe it's `PyMemory` or something?
Let's search for "mem" in `amaranth/sim`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "mem" amaranth/sim/ | head -n 20<|"|>}<tool_call|><|tool_response>
Turn 4at 93 s197 tokens out5,697 prompt tokens
That's very weird. `grep` is returning nothing. Maybe my `grep` command is wrong or the directory structure is different. Wait, I saw `amaranth/sim/_pyrtl.py` in the workspace layout. Let me try `grep -rn "Memory" .` but filtered to `amaranth/sim`. Actually, let's look at `amaranth/sim/_pyrtl.py` content. But first, let's try to reproduce the bug. I need a test file. The provided code uses `TestCaseWithSimulator`. I should find where that is defined. It's likely in `amaranth/sim/pysim.py` or `amaranth/sim/_base.py`. Let's find `TestCaseWithSimulator`.
TOOL CALL · run_command
{
"command": "grep -rn \"TestCaseWithSimulator\" amaranth/sim/"
}Result of run_command 127 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "",
"details": {
"stdout": "",
"stderr": "",
"exit_code": 1
}
}Generated tokens 197 tokens · stopped: STOP
That's very weird. `grep` is returning nothing. Maybe my `grep` command is wrong or the directory structure is different.
Wait, I saw `amaranth/sim/_pyrtl.py` in the workspace layout.
Let me try `grep -rn "Memory" .` but filtered to `amaranth/sim`.
Actually, let's look at `amaranth/sim/_pyrtl.py` content.
But first, let's try to reproduce the bug.
I need a test file. The provided code uses `TestCaseWithSimulator`. I should find where that is defined.
It's likely in `amaranth/sim/pysim.py` or `amaranth/sim/_base.py`.
Let's find `TestCaseWithSimulator`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "TestCaseWithSimulator" amaranth/sim/<|"|>}<tool_call|><|tool_response>
Turn 5at 97 s77 tokens out5,949 prompt tokens
Still nothing? Maybe it's not in `amaranth/sim/` but in `tests/`? No, the user said " unit tests use amaranth tests framework". Let's search the whole repository for `TestCaseWithSimulator`.
TOOL CALL · run_command
{
"command": "grep -rn \"TestCaseWithSimulator\" ."
}Result of run_command 127 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "",
"details": {
"stdout": "",
"stderr": "",
"exit_code": 1
}
}Generated tokens 77 tokens · stopped: STOP
Still nothing? Maybe it's not in `amaranth/sim/` but in `tests/`?
No, the user said " unit tests use amaranth tests framework".
Let's search the whole repository for `TestCaseWithSimulator`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "TestCaseWithSimulator" .<|"|>}<tool_call|><|tool_response>
Turn 6at 101 s49 tokens out6,081 prompt tokens
This is extremely strange. Is `grep` working? Let me try `ls -R amaranth/sim/`.
TOOL CALL · run_command
{
"command": "ls -R amaranth/sim/"
}Result of run_command 154 characters
{
"status": "ok",
"stdout": "amaranth/sim/:\n__init__.py\n_base.py\n_pyclock.py\n_pycoro.py\n_pyrtl.py\ncore.py\npysim.py\n",
"stderr": "",
"exit_code": 0
}Generated tokens 49 tokens · stopped: STOP
This is extremely strange. Is `grep` working?
Let me try `ls -R amaranth/sim/`.
<channel|><|tool_call>call:run_command{command:<|"|>ls -R amaranth/sim/<|"|>}<tool_call|><|tool_response>
Turn 7at 104 s59 tokens out6,220 prompt tokens
Okay, files are there. Let me try `grep -l "class " amaranth/sim/pysim.py`.
TOOL CALL · run_command
{
"command": "grep -l \"class \" amaranth/sim/pysim.py"
}Result of run_command 83 characters
{
"status": "ok",
"stdout": "amaranth/sim/pysim.py\n",
"stderr": "",
"exit_code": 0
}Generated tokens 59 tokens · stopped: STOP
Okay, files are there. Let me try `grep -l "class " amaranth/sim/pysim.py`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -l "class " amaranth/sim/pysim.py<|"|>}<tool_call|><|tool_response>
Turn 8at 115 s167 tokens out6,329 prompt tokens
Wait, if `grep -l "class " amaranth/sim/pysim.py` works, why did `grep -rn "Memory" amaranth/sim/` fail? Ah, maybe I should check if there are any special characters or the `grep` behavior is weird. Wait, the user's reproduction code uses `TestCaseWithSimulator`. If it's not in the repo, maybe it's in a base class I don't see. Actually, maybe I should check `amaranth/sim/pysim.py` and `amaranth/sim/_pyrtl.py` directly.
TOOL CALL · run_command
{
"command": "cat amaranth/sim/pysim.py | head -n 50"
}Result of run_command 1,761 characters
{
"status": "ok",
"stdout": "from contextlib import contextmanager\nimport itertools\nimport re\nfrom vcd import VCDWriter\nfrom vcd.gtkw import GTKWSave\n\nfrom ..hdl import *\nfrom ..hdl.ast import SignalDict\nfrom ._base import *\nfrom ._pyrtl import _FragmentCompiler\nfrom ._pycoro import PyCoroProcess\nfrom ._pyclock import PyClockProcess\n\n\n__all__ = [\"PySimEngine\"]\n\n\nclass _NameExtractor:\n def __init__(self):\n self.names = SignalDict()\n\n def __call__(self, fragment, *, hierarchy=(\"bench\", \"top\",)):\n def add_signal_name(signal):\n hierarchical_signal_name = (*hierarchy, signal.name)\n if signal not in self.names:\n self.names[signal] = {hierarchical_signal_name}\n else:\n self.names[signal].add(hierarchical_signal_name)\n\n for domain_name, domain_signals in fragment.drivers.items():\n if domain_name is not None:\n domain = fragment.domains[domain_name]\n add_signal_name(domain.clk)\n if domain.rst is not None:\n add_signal_name(domain.rst)\n\n for statement in fragment.statements:\n for signal in statement._lhs_signals() | statement._rhs_signals():\n if not isinstance(signal, (ClockSignal, ResetSignal)):\n add_signal_name(signal)\n\n for subfragment_index, (subfragment, subfragment_name) in enumerate(fragment.subfragments):\n if subfragment_name is None:\n subfragment_name = \"U${}\".format(subfragment_index)\n self(subfragment, hierarchy=(*hierarchy, subfragment_name))\n\n return self.names\n\n\nclass _VCDWriter:\n",
"stderr": "",
"exit_code": 0
}Generated tokens 167 tokens · stopped: STOP
Wait, if `grep -l "class " amaranth/sim/pysim.py` works, why did `grep -rn "Memory" amaranth/sim/` fail?
Ah, maybe I should check if there are any special characters or the `grep` behavior is weird.
Wait, the user's reproduction code uses `TestCaseWithSimulator`. If it's not in the repo, maybe it's in a base class I don't see.
Actually, maybe I should check `amaranth/sim/pysim.py` and `amaranth/sim/_pyrtl.py` directly.
<channel|><|tool_call>call:run_command{command:<|"|>cat amaranth/sim/pysim.py | head -n 50<|"|>}<tool_call|><|tool_response>
Turn 9at 125 s122 tokens out6,999 prompt tokens
`PySimEngine` is here. Let's search for `TestCaseWithSimulator` in the whole repository again, but more carefully. Actually, the user's code might be a snippet and `TestCaseWithSimulator` might be something they defined or is part of some other utility. But the problem is about `Memory` simulation. Let's look at `amaranth/hdl/mem.py` to see how `Memory` is defined.
TOOL CALL · read_file
{
"filepath": "amaranth/hdl/mem.py"
}Result of read_file 5,973 characters
{
"status": "ok",
"filepath": "amaranth/hdl/mem.py",
"content": "import operator\nfrom collections import OrderedDict\n\nfrom .. import tracer\nfrom .ast import *\nfrom .ir import Elaboratable, Instance, Fragment\n\n\n__all__ = [\"Memory\", \"ReadPort\", \"WritePort\", \"DummyPort\"]\n\n\nclass Memory(Elaboratable):\n \"\"\"A word addressable storage.\n\n Parameters\n ----------\n width : int\n Access granularity. Each storage element of this memory is ``width`` bits in size.\n depth : int\n Word count. This memory contains ``depth`` storage elements.\n init : list of int\n Initial values. At power on, each storage element in this memory is initialized to\n the corresponding element of ``init``, if any, or to zero otherwise.\n Uninitialized memories are not currently supported.\n name : str\n Name hint for this memory. If ``None`` (default) the name is inferred from the variable\n name this ``Signal`` is assigned to.\n attrs : dict\n Dictionary of synthesis attributes.\n\n Attributes\n ----------\n width : int\n depth : int\n init : list of int\n attrs : dict\n \"\"\"\n def __init__(self, *, width, depth, init=None, name=None, attrs=None, simulate=True):\n if not isinstance(width, int) or width < 0:\n raise TypeError(\"Memory width must be a non-negative integer, not {!r}\"\n .format(width))\n if not isinstance(depth, int) or depth < 0:\n raise TypeError(\"Memory depth must be a non-negative integer, not {!r}\"\n .format(depth))\n\n self.name = name or tracer.get_var_name(depth=2, default=\"$memory\")\n self.src_loc = tracer.get_src_loc()\n\n self.width = width\n self.depth = depth\n self.attrs = OrderedDict(() if attrs is None else attrs)\n\n # Array of signals for simulation.\n self._array = Array()\n if simulate:\n for addr in range(self.depth):\n self._array.append(Signal(self.width, name=\"{}({})\"\n .format(name or \"memory\", addr)))\n\n self.init = init\n self._read_ports = []\n self._write_ports = []\n\n @property\n def init(self):\n return self._init\n\n @init.setter\n def init(self, new_init):\n self._init = [] if new_init is None else list(new_init)\n if len(self.init) > self.depth:\n raise ValueError(\"Memory initialization value count exceed memory depth ({} > {})\"\n .format(len(self.init), self.depth))\n\n try:\n for addr in range(len(self._array)):\n if addr < len(self._init):\n self._array[addr].reset = operator.index(self._init[addr])\n else:\n self._array[addr].reset = 0\n except TypeError as e:\n raise TypeError(\"Memory initialization value at address {:x}: {}\"\n .format(addr, e)) from None\n\n def read_port(self, *, src_loc_at=0, **kwargs):\n \"\"\"Get a read port.\n\n See :class:`ReadPort` for details.\n\n Arguments\n ---------\n domain : str\n transparent : bool\n\n Returns\n -------\n An instance of :class:`ReadPort` associated with this memory.\n \"\"\"\n return ReadPort(self, src_loc_at=1 + src_loc_at, **kwargs)\n\n def write_port(self, *, src_loc_at=0, **kwargs):\n \"\"\"Get a write port.\n\n See :class:`WritePort` for details.\n\n Arguments\n ---------\n domain : str\n granularity : int\n\n Returns\n -------\n An instance of :class:`WritePort` associated with this memory.\n \"\"\"\n return WritePort(self, src_loc_at=1 + src_loc_at, **kwargs)\n\n def __getitem__(self, index):\n \"\"\"Simulation only.\"\"\"\n return self._array[index]\n\n def elaborate(self, platform):\n init = \"\".join(format(Const(elem, unsigned(self.width)).value, f\"0{self.width}b\") for elem in reversed(self.init))\n init = Const(int(init or \"0\", 2), self.depth * self.width)\n rd_clk = []\n rd_clk_enable = 0\n rd_transparency_mask = 0\n for index, port in enumerate(self._read_ports):\n if port.domain != \"comb\":\n rd_clk.append(ClockSignal(port.domain))\n rd_clk_enable |= 1 << index\n if port.transparent:\n for write_index, write_port in enumerate(self._write_ports):\n if port.domain == write_port.domain:\n rd_transparency_mask |= 1 << (index * len(self._write_ports) + write_index)\n else:\n rd_clk.append(Const(0, 1))\n f = Instance(\"$mem_v2\",\n *((\"a\", attr, value) for attr, value in self.attrs.items()),\n p_SIZE=self.depth,\n p_OFFSET=0,\n p_ABITS=Shape.cast(range(self.depth)).width,\n p_WIDTH=self.width,\n p_INIT=init,\n p_RD_PORTS=len(self._read_ports),\n p_RD_CLK_ENABLE=Const(rd_clk_enable, len(self._read_ports)) if self._read_ports else Const(0, 1),\n p_RD_CLK_POLARITY=Const(-1, unsigned(len(self._read_ports))) if self._read_ports else Const(0, 1),\n p_RD_TRANSPARENCY_MASK=Const(rd_transparency_mask, max(1, len(self._read_ports) * len(self._write_ports))),\n p_RD_COLLISION_X_MASK=Const(0, max(1, len(self._read_ports) * len(self._write_ports))),\n p_RD_WIDE_CONTINUATION=Const(0, len(self._read_ports)) if self._read_ports else Const(0, 1),\n p_RD_CE_OVER_SRST=Const(0, len(self._read_ports)) if self._read_ports else Const(0, 1),",
"start_line": 1,
"end_line": 150,
"total_lines": 354,
"is_truncated": true
}Generated tokens 122 tokens · stopped: STOP
`PySimEngine` is here.
Let's search for `TestCaseWithSimulator` in the whole repository again, but more carefully.
Actually, the user's code might be a snippet and `TestCaseWithSimulator` might be something they defined or is part of some other utility.
But the problem is about `Memory` simulation.
Let's look at `amaranth/hdl/mem.py` to see how `Memory` is defined.
<channel|><|tool_call>call:read_file{filepath:<|"|>amaranth/hdl/mem.py<|"|>}<tool_call|><|tool_response>
Turn 10at 142 s179 tokens out8,865 prompt tokens
`Memory` has an `_array` which is an `Array` of `Signal`s.
```python
# Array of signals for simulation.
self._array = Array()
if simulate:
for addr in range(self.depth):
self._array.append(Signal(self.width, name="{}({})".
.format(name or "memory", addr)))
```
This means that in simulation, a memory is modeled as a collection of signals.
Now let's see how `ReadPort` and `WritePort` use these signals. I'll read the rest of `amaranth/hdl/mem.py`.
TOOL CALL · read_file
{
"filepath": "amaranth/hdl/mem.py",
"start_line": 151
}Result of read_file 7,018 characters
{
"status": "ok",
"filepath": "amaranth/hdl/mem.py",
"content": " p_RD_ARST_VALUE=Const(0, len(self._read_ports) * self.width),\n p_RD_SRST_VALUE=Const(0, len(self._read_ports) * self.width),\n p_RD_INIT_VALUE=Const(0, len(self._read_ports) * self.width),\n p_WR_PORTS=len(self._write_ports),\n p_WR_CLK_ENABLE=Const(-1, unsigned(len(self._write_ports))) if self._write_ports else Const(0, 1),\n p_WR_CLK_POLARITY=Const(-1, unsigned(len(self._write_ports))) if self._write_ports else Const(0, 1),\n p_WR_PRIORITY_MASK=Const(0, len(self._write_ports) * len(self._write_ports)) if self._write_ports else Const(0, 1),\n p_WR_WIDE_CONTINUATION=Const(0, len(self._write_ports)) if self._write_ports else Const(0, 1),\n i_RD_CLK=Cat(rd_clk),\n i_RD_EN=Cat(port.en for port in self._read_ports),\n i_RD_ARST=Const(0, len(self._read_ports)),\n i_RD_SRST=Const(0, len(self._read_ports)),\n i_RD_ADDR=Cat(port.addr for port in self._read_ports),\n o_RD_DATA=Cat(port.data for port in self._read_ports),\n i_WR_CLK=Cat(ClockSignal(port.domain) for port in self._write_ports),\n i_WR_EN=Cat(Cat(en_bit.replicate(port.granularity) for en_bit in port.en) for port in self._write_ports),\n i_WR_ADDR=Cat(port.addr for port in self._write_ports),\n i_WR_DATA=Cat(port.data for port in self._write_ports),\n )\n for port in self._read_ports:\n port._MustUse__used = True\n if port.domain == \"comb\":\n # Asynchronous port\n f.add_statements(port.data.eq(self._array[port.addr]))\n f.add_driver(port.data)\n else:\n # Synchronous port\n data = self._array[port.addr]\n for write_port in self._write_ports:\n if port.domain == write_port.domain and port.transparent:\n if len(write_port.en) > 1:\n parts = []\n for index, en_bit in enumerate(write_port.en):\n offset = index * write_port.granularity\n bits = slice(offset, offset + write_port.granularity)\n cond = en_bit & (port.addr == write_port.addr)\n parts.append(Mux(cond, write_port.data[bits], data[bits]))\n data = Cat(parts)\n else:\n data = Mux(write_port.en, write_port.data, data)\n f.add_statements(\n Switch(port.en, {\n 1: port.data.eq(data)\n })\n )\n f.add_driver(port.data, port.domain)\n for port in self._write_ports:\n port._MustUse__used = True\n if len(port.en) > 1:\n for index, en_bit in enumerate(port.en):\n offset = index * port.granularity\n bits = slice(offset, offset + port.granularity)\n write_data = self._array[port.addr][bits].eq(port.data[bits])\n f.add_statements(Switch(en_bit, { 1: write_data }))\n else:\n write_data = self._array[port.addr].eq(port.data)\n f.add_statements(Switch(port.en, { 1: write_data }))\n for signal in self._array:\n f.add_driver(signal, port.domain)\n return f\n\nclass ReadPort(Elaboratable):\n \"\"\"A memory read port.\n\n Parameters\n ----------\n memory : :class:`Memory`\n Memory associated with the port.\n domain : str\n Clock domain. Defaults to ``\"sync\"``. If set to ``\"comb\"``, the port is asynchronous.\n Otherwise, the read data becomes available on the next clock cycle.\n transparent : bool\n Port transparency. If set (default), a read at an address that is also being written to in\n the same clock cycle will output the new value. Otherwise, the old value will be output\n first. This behavior only applies to ports in the same domain.\n\n Attributes\n ----------\n memory : :class:`Memory`\n domain : str\n transparent : bool\n addr : Signal(range(memory.depth)), in\n Read address.\n data : Signal(memory.width), out\n Read data.\n en : Signal or Const, in\n Read enable. If asserted, ``data`` is updated with the word stored at ``addr``.\n\n Exceptions\n ----------\n Raises :exn:`ValueError` if the read port is simultaneously asynchronous and non-transparent.\n \"\"\"\n def __init__(self, memory, *, domain=\"sync\", transparent=True, src_loc_at=0):\n if domain == \"comb\" and not transparent:\n raise ValueError(\"Read port cannot be simultaneously asynchronous and non-transparent\")\n\n self.memory = memory\n self.domain = domain\n self.transparent = transparent\n\n self.addr = Signal(range(memory.depth),\n name=\"{}_r_addr\".format(memory.name), src_loc_at=1 + src_loc_at)\n self.data = Signal(memory.width,\n name=\"{}_r_data\".format(memory.name), src_loc_at=1 + src_loc_at)\n if self.domain != \"comb\":\n self.en = Signal(name=\"{}_r_en\".format(memory.name), reset=1,\n src_loc_at=1 + src_loc_at)\n else:\n self.en = Const(1)\n\n memory._read_ports.append(self)\n\n def elaborate(self, platform):\n if self is self.memory._read_ports[0]:\n return self.memory\n else:\n return Fragment()\n\n\nclass WritePort(Elaboratable):\n \"\"\"A memory write port.\n\n Parameters\n ----------\n memory : :class:`Memory`\n Memory associated with the port.\n domain : str\n Clock domain. Defaults to ``\"sync\"``. Writes have a latency of 1 clock cycle.\n granularity : int\n Port granularity. Defaults to ``memory.width``. Write data is split evenly in\n ``memory.width // granularity`` chunks, which can be updated independently.\n\n Attributes\n ----------\n memory : :class:`Memory`\n domain : str\n granularity : int\n addr : Signal(range(memory.depth)), in\n Write address.\n data : Signal(memory.width), in\n Write data.\n en : Signal(memory.width // granularity), in\n Write enable. Each bit selects a non-overlapping chunk of ``granularity`` bits on the\n ``data`` signal, which is written to memory at ``addr``. Unselected chunks are ignored.\n\n Exceptions\n ----------\n Raises :exn:`ValueError` if the write port granularity is greater than memory width, or does not\n divide memory width evenly.\n \"\"\"",
"start_line": 151,
"end_line": 300,
"total_lines": 354,
"is_truncated": true
}Generated tokens 179 tokens · stopped: STOP
`Memory` has an `_array` which is an `Array` of `Signal`s.
```python
# Array of signals for simulation.
self._array = Array()
if simulate:
for addr in range(self.depth):
self._array.append(Signal(self.width, name="{}({})".
.format(name or "memory", addr)))
```
This means that in simulation, a memory is modeled as a collection of signals.
Now let's see how `ReadPort` and `WritePort` use these signals. I'll read the rest of `amaranth/hdl/mem.py`.
<channel|><|tool_call>call:read_file{filepath:<|"|>amaranth/hdl/mem.py<|"|>,start_line:151}<tool_call|><|tool_response>
Turn 11at 145 s41 tokens out11,031 prompt tokens
And the rest of `WritePort`.
TOOL CALL · read_file
{
"filepath": "amaranth/hdl/mem.py",
"start_line": 301
}Result of read_file 2,670 characters
{
"status": "ok",
"filepath": "amaranth/hdl/mem.py",
"content": " def __init__(self, memory, *, domain=\"sync\", granularity=None, src_loc_at=0):\n if granularity is None:\n granularity = memory.width\n if not isinstance(granularity, int) or granularity < 0:\n raise TypeError(\"Write port granularity must be a non-negative integer, not {!r}\"\n .format(granularity))\n if granularity > memory.width:\n raise ValueError(\"Write port granularity must not be greater than memory width \"\n \"({} > {})\"\n .format(granularity, memory.width))\n if memory.width // granularity * granularity != memory.width:\n raise ValueError(\"Write port granularity must divide memory width evenly\")\n\n self.memory = memory\n self.domain = domain\n self.granularity = granularity\n\n self.addr = Signal(range(memory.depth),\n name=\"{}_w_addr\".format(memory.name), src_loc_at=1 + src_loc_at)\n self.data = Signal(memory.width,\n name=\"{}_w_data\".format(memory.name), src_loc_at=1 + src_loc_at)\n self.en = Signal(memory.width // granularity,\n name=\"{}_w_en\".format(memory.name), src_loc_at=1 + src_loc_at)\n\n memory._write_ports.append(self)\n\n def elaborate(self, platform):\n if not self.memory._read_ports and self is self.memory._write_ports[0]:\n return self.memory\n else:\n return Fragment()\n\n\nclass DummyPort:\n \"\"\"Dummy memory port.\n\n This port can be used in place of either a read or a write port for testing and verification.\n It does not include any read/write port specific attributes, i.e. none besides ``\"domain\"``;\n any such attributes may be set manually.\n \"\"\"\n def __init__(self, *, data_width, addr_width, domain=\"sync\", name=None, granularity=None):\n self.domain = domain\n\n if granularity is None:\n granularity = data_width\n if name is None:\n name = tracer.get_var_name(depth=2, default=\"dummy\")\n\n self.addr = Signal(addr_width,\n name=\"{}_addr\".format(name), src_loc_at=1)\n self.data = Signal(data_width,\n name=\"{}_data\".format(name), src_loc_at=1)\n self.en = Signal(data_width // granularity,\n name=\"{}_en\".format(name), src_loc_at=1)",
"start_line": 301,
"end_line": 354,
"total_lines": 354,
"is_truncated": false
}Generated tokens 41 tokens · stopped: STOP
And the rest of `WritePort`.
<channel|><|tool_call>call:read_file{filepath:<|"|>amaranth/hdl/mem.py<|"|>,start_line:301}<tool_call|><|tool_response>
Turn 12at 225 s1,398 tokens out11,811 prompt tokens
Now let's analyze how `Memory` simulation works in ` elaborate`.
```python
for port in self._read_ports:
port._MustUse__used = True
if port.domain == "comb":
# Asynchronous port
f.add_statements(port.data.eq(self._array[port.addr]))
f.add_driver(port.data)
else:
# Synchronous port
data = self._array[port.addr]
for write_port in self._write_ports:
if port.domain == write_port.domain and port.transparent:
if len(write_port.en) > 1:
# ... parts handling ...
else:
data = Mux(write_port.en, write_port.data, data)
f.add_statements(
Switch(port.en, {
1: port.data.eq(data)
})
)
f.add_driver(port.data, port.domain)
for port in self._write_ports:
port._MustUse__used = True
if len(port.en) > 1:
for index, en_bit in enumerate(port.en):
offset = index * port.granularity
bits = slice(offset, offset + port.granularity)
write_data = self._array[port.addr][bits].eq(port.data[bits])
f.add_statements(Switch(en_bit, { 1: write_data }))
else:
write_data = self._array[port.addr].eq(port.data)
f.add_statements(Switch(port.en, { 1: write_data }))
for signal in self._array:
f.add_driver(signal, port.domain)
```
Crucially, for a synchronous read port:
```python
data = self._array[port.addr]
for write_port in self._write_ports:
if port.domain == write_port.domain and port.transparent:
# ...
data = Mux(write_port.en, write_port.data, data)
f.add_statements(
Switch(port.en, {
1: port.data.eq(data)
})
)
```
And for a write port:
```python
else:
write_data = self._array[port.addr].eq(port.data)
f.add_statements(Switch(port.en, { 1: write_data }))
```
The issue is that when `write_port.en` is high, it updates `self._array[port.addr]`.
But `self._array[port.addr]` is not a signal itself, it's indexed into `self._array` which contains `Signal`s.
Wait, `self._array[port.addr]` where `port.addr` is a `Signal`.
In Amaranth, indexing a list of signals with a signal creates a special expression.
Let's see how `self._array[port.addr]` is handled in `amaranth/sim/_pyrtl.py` (or wherever expressions are evaluated).
Wait, if `port.addr` is a Signal, `self._array[port.addr]` is an expression.
If we have `self._array[port.addr].eq(port.data)`, this is a signal assignment.
The problem description says: "Write cause that on read data output port there is visible written value for one cycle."
This suggests that the write is happening and then the read port (which might be reading the same address or different address) is picking up this value.
Actually, the reproduction code says they read address 1 and write address 2.
```py
yield m.read_port.addr.eq(1)
yield m.read_port.en.eq(1)
yield
print((yield m.read_port.data)) # cycle 1: read addr 1
yield
yield m.write_port.addr.eq(2)
yield m.write_port.data.eq(14)
yield m.write_port.en.eq(1)
print((yield m.read_port.data)) # cycle 2: read addr 1
```
Wait, in cycle 2, `m.read_port.addr` is still 1 (it was set in cycle 0 and not changed).
But `m.write_port.addr` is 2.
If `m.read_port.data` becomes 14, it means the write to address 2 somehow affected the read from address 1.
Wait, if `self._array[port.addr]` is not implemented correctly in simulation, maybe it's ignoring the address when updating or reading?
Let's look at how `self._array[port.addr]` is simulated.
I need to find where `Array` or indexing is handled in simulation.
`self._array` is an `amaranth.hdl.ast.Array`. Let's check `amaranth/hdl/ast.py`.
But first, I'll write a reproduction script and run it. I need to make sure I have a working environment and can use `amaranth.sim`.
Since I don't know where `TestCaseWithSimulator` is, I'll write a standalone script using `PySimEngine`.
Wait, I should try to find `TestCaseWithSimulator` again. Maybe it's in `tests/` but not in `amaranth/sim/`?
No, usually it's a base class provided by the framework.
Let me check `amaranth/sim/pysim.py` again.
Actually, I can just use the `amaranth.sim.PySimEngine`.
Let's create a reproduction script in `/tmp/repro.py`.
I need to see how to use `PySimEngine`.
TOOL CALL · run_command
{
"command": "cat amaranth/sim/pysim.py | grep -C 5 \"PySimEngine\""
}Result of run_command 589 characters
{
"status": "ok",
"stdout": "from ._pyrtl import _FragmentCompiler\nfrom ._pycoro import PyCoroProcess\nfrom ._pyclock import PyClockProcess\n\n\n__all__ = [\"PySimEngine\"]\n\n\nclass _NameExtractor:\n def __init__(self):\n self.names = SignalDict()\n--\n changed.update(self.pending)\n self.pending.clear()\n return converged\n\n\nclass PySimEngine(BaseEngine):\n def __init__(self, fragment):\n self._state = _PySimulation()\n self._timeline = self._state.timeline\n\n self._fragment = fragment\n",
"stderr": "",
"exit_code": 0
}Generated tokens 1,398 tokens · stopped: STOP
Now let's analyze how `Memory` simulation works in ` elaborate`.
```python
for port in self._read_ports:
port._MustUse__used = True
if port.domain == "comb":
# Asynchronous port
f.add_statements(port.data.eq(self._array[port.addr]))
f.add_driver(port.data)
else:
# Synchronous port
data = self._array[port.addr]
for write_port in self._write_ports:
if port.domain == write_port.domain and port.transparent:
if len(write_port.en) > 1:
# ... parts handling ...
else:
data = Mux(write_port.en, write_port.data, data)
f.add_statements(
Switch(port.en, {
1: port.data.eq(data)
})
)
f.add_driver(port.data, port.domain)
for port in self._write_ports:
port._MustUse__used = True
if len(port.en) > 1:
for index, en_bit in enumerate(port.en):
offset = index * port.granularity
bits = slice(offset, offset + port.granularity)
write_data = self._array[port.addr][bits].eq(port.data[bits])
f.add_statements(Switch(en_bit, { 1: write_data }))
else:
write_data = self._array[port.addr].eq(port.data)
f.add_statements(Switch(port.en, { 1: write_data }))
for signal in self._array:
f.add_driver(signal, port.domain)
```
Crucially, for a synchronous read port:
```python
data = self._array[port.addr]
for write_port in self._write_ports:
if port.domain == write_port.domain and port.transparent:
# ...
data = Mux(write_port.en, write_port.data, data)
f.add_statements(
Switch(port.en, {
1: port.data.eq(data)
})
)
```
And for a write port:
```python
else:
write_data = self._array[port.addr].eq(port.data)
f.add_statements(Switch(port.en, { 1: write_data }))
```
The issue is that when `write_port.en` is high, it updates `self._array[port.addr]`.
But `self._array[port.addr]` is not a signal itself, it's indexed into `self._array` which contains `Signal`s.
Wait, `self._array[port.addr]` where `port.addr` is a `Signal`.
In Amaranth, indexing a list of signals with a signal creates a special expression.
Let's see how `self._array[port.addr]` is handled in `amaranth/sim/_pyrtl.py` (or wherever expressions are evaluated).
Wait, if `port.addr` is a Signal, `self._array[port.addr]` is an expression.
If we have `self._array[port.addr].eq(port.data)`, this is a signal assignment.
The problem description says: "Write cause that on read data output port there is visible written value for one cycle."
This suggests that the write is happening and then the read port (which might be reading the same address or different address) is picking up this value.
Actually, the reproduction code says they read address 1 and write address 2.
```py
yield m.read_port.addr.eq(1)
yield m.read_port.en.eq(1)
yield
print((yield m.read_port.data)) # cycle 1: read addr 1
yield
yield m.write_port.addr.eq(2)
yield m.write_port.data.eq(14)
yield m.write_port.en.eq(1)
print((yield m.read_port.data)) # cycle 2: read addr 1
```
Wait, in cycle 2, `m.read_port.addr` is still 1 (it was set in cycle 0 and not changed).
But `m.write_port.addr` is 2.
If `m.read_port.data` becomes 14, it means the write to address 2 somehow affected the read from address 1.
Wait, if `self._array[port.addr]` is not implemented correctly in simulation, maybe it's ignoring the address when updating or reading?
Let's look at how `self._array[port.addr]` is simulated.
I need to find where `Array` or indexing is handled in simulation.
`self._array` is an `amaranth.hdl.ast.Array`. Let's check `amaranth/hdl/ast.py`.
But first, I'll write a reproduction script and run it. I need to make sure I have a working environment and can use `amaranth.sim`.
Since I don't know where `TestCaseWithSimulator` is, I'll write a standalone script using `PySimEngine`.
Wait, I should try to find `TestCaseWithSimulator` again. Maybe it's in `tests/` but not in `amaranth/sim/`?
No, usually it's a base class provided by the framework.
Let me check `amaranth/sim/pysim.py` again.
Actually, I can just use the `amaranth.sim.PySimEngine`.
Let's create a reproduction script in `/tmp/repro.py`.
I need to see how to use `PySimEngine`.
<channel|><|tool_call>call:run_command{command:<|"|>cat amaranth/sim/pysim.py | grep -C 5 "PySimEngine"<|"|>}<tool_call|><|tool_response>
Turn 13at 252 s363 tokens out13,405 prompt tokens
Okay, `PySimEngine` takes a `fragment`.
Let's try to build a reproduction script.
I'll need `Elaboratable`, `Module`, `Memory`, `Signal`, and `PySimEngine`.
```python
from amaranth import hdl
from amaranth.sim import PySimEngine
class DUT(hdl.Elaboratable):
def __init__(self):
self.mem = None
self.read_port = None
self.write_port = None
def elaborate(self, platform):
m = hdl.Module()
self.mem = hdl.Memory(width=8, depth=8)
self.read_port = self.mem.read_port()
self.write_port = self.mem.write_port()
m.submodules.read_port = self.read_port
m.submodules.write_port = self.write_port
return m
def process(dut):
# Use a generator to simulate clock cycles
# We need to use PySimEngine.sim.add_sync_process if we want to use the engine.
# But we can also just use the simulation loop.
pass
# Let's use the provided reproduction code if I can find how to run it.
```
Wait, the user provided a `TestCaseWithSimulator` example. Let's try to find where that class is.
If I search for `class TestCaseWithSimulator` in the whole repo.
TOOL CALL · run_command
{
"command": "grep -rn \"class TestCaseWithSimulator\" ."
}Result of run_command 127 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "",
"details": {
"stdout": "",
"stderr": "",
"exit_code": 1
}
}Generated tokens 363 tokens · stopped: STOP
Okay, `PySimEngine` takes a `fragment`.
Let's try to build a reproduction script.
I'll need `Elaboratable`, `Module`, `Memory`, `Signal`, and `PySimEngine`.
```python
from amaranth import hdl
from amaranth.sim import PySimEngine
class DUT(hdl.Elaboratable):
def __init__(self):
self.mem = None
self.read_port = None
self.write_port = None
def elaborate(self, platform):
m = hdl.Module()
self.mem = hdl.Memory(width=8, depth=8)
self.read_port = self.mem.read_port()
self.write_port = self.mem.write_port()
m.submodules.read_port = self.read_port
m.submodules.write_port = self.write_port
return m
def process(dut):
# Use a generator to simulate clock cycles
# We need to use PySimEngine.sim.add_sync_process if we want to use the engine.
# But we can also just use the simulation loop.
pass
# Let's use the provided reproduction code if I can find how to run it.
```
Wait, the user provided a `TestCaseWithSimulator` example. Let's try to find where that class is.
If I search for `class TestCaseWithSimulator` in the whole repo.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "class TestCaseWithSimulator" .<|"|>}<tool_call|><|tool_response>
Turn 14at 259 s132 tokens out13,823 prompt tokens
Okay, it's not in the repo. Maybe it's because the user is using a different version or they have their own base class. But the issue is with `amaranth` simulation, so I should be able to reproduce it with `amaranth.sim`. Let's try to implement the reproduction using `PySimEngine` directly. I'll look at `amaranth/sim/core.py` to see if there is a more useful helper.
TOOL CALL · run_command
{
"command": "cat amaranth/sim/core.py | head -n 50"
}Result of run_command 1,247 characters
{
"status": "ok",
"stdout": "import inspect\nimport warnings\n\nfrom .._utils import deprecated\nfrom ..hdl.cd import *\nfrom ..hdl.ir import *\nfrom ._base import BaseEngine\n\n\n__all__ = [\"Settle\", \"Delay\", \"Tick\", \"Passive\", \"Active\", \"Simulator\"]\n\n\nclass Command:\n pass\n\n\nclass Settle(Command):\n def __repr__(self):\n return \"(settle)\"\n\n\nclass Delay(Command):\n def __init__(self, interval=None):\n self.interval = None if interval is None else float(interval)\n\n def __repr__(self):\n if self.interval is None:\n return \"(delay ε)\"\n else:\n return \"(delay {:.3}us)\".format(self.interval * 1e6)\n\n\nclass Tick(Command):\n def __init__(self, domain=\"sync\"):\n if not isinstance(domain, (str, ClockDomain)):\n raise TypeError(\"Domain must be a string or a ClockDomain instance, not {!r}\"\n .format(domain))\n assert domain != \"comb\"\n self.domain = domain\n\n def __repr__(self):\n return \"(tick {})\".format(self.domain)\n\n\nclass Passive(Command):\n def __repr__(self):\n return \"(passive)\"\n\n\nclass Active(Command):\n",
"stderr": "",
"exit_code": 0
}Generated tokens 132 tokens · stopped: STOP
Okay, it's not in the repo. Maybe it's because the user is using a different version or they have their own base class.
But the issue is with `amaranth` simulation, so I should be able to reproduce it with `amaranth.sim`.
Let's try to implement the reproduction using `PySimEngine` directly.
I'll look at `amaranth/sim/core.py` to see if there is a more useful helper.
<channel|><|tool_call>call:run_command{command:<|"|>cat amaranth/sim/core.py | head -n 50<|"|>}<tool_call|><|tool_response>
Turn 15at 266 s100 tokens out14,344 prompt tokens
I'll try to write a minimal reproduction script using `amaranth.sim.PySimEngine` and `amaranth.hdl`. Since I don't have a clear example of how to use `PySimEngine` outside of a test case, let's look at some existing tests in `tests/`.
TOOL CALL · run_command
{
"command": "find tests/ -name \"*test*.py\" | head -n 20"
}Result of run_command 573 characters
{
"status": "ok",
"stdout": "tests/test_lib_coding.py\ntests/test_examples.py\ntests/test_tracer.py\ntests/test_lib_io.py\ntests/test_hdl_rec.py\ntests/test_hdl_cd.py\ntests/test_build_dsl.py\ntests/test_hdl_ir.py\ntests/test_build_plat.py\ntests/test_lib_cdc.py\ntests/compat/test_coding.py\ntests/compat/test_signed.py\ntests/compat/test_passive.py\ntests/compat/test_fifo.py\ntests/compat/test_run_simulation.py\ntests/compat/test_constant.py\ntests/compat/test_size.py\ntests/compat/test_fsm.py\ntests/test_hdl_dsl.py\ntests/test_sim.py\n",
"stderr": "",
"exit_code": 0
}Generated tokens 100 tokens · stopped: STOP
I'll try to write a minimal reproduction script using `amaranth.sim.PySimEngine` and `amaranth.hdl`.
Since I don't have a clear example of how to use `PySimEngine` outside of a test case, let's look at some existing tests in `tests/`.
<channel|><|tool_call>call:run_command{command:<|"|>find tests/ -name "*test*.py" | head -n 20<|"|>}<tool_call|><|tool_response>
Turn 16at 319 s80 tokens out3,657 prompt tokens
`tests/test_sim.py` seems like a good place to look for how simulations are run. Also `tests/test_hdl_dsl.py` might have memory tests.
TOOL CALL · run_command
{
"command": "grep -rn \"Memory\" tests/test_hdl_dsl.py | head -n 20"
}Result of run_command 60 characters
{
"status": "ok",
"stdout": "",
"stderr": "",
"exit_code": 0
}Generated tokens 80 tokens · stopped: STOP
`tests/test_sim.py` seems like a good place to look for how simulations are run.
Also `tests/test_hdl_dsl.py` might have memory tests.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "Memory" tests/test_hdl_dsl.py | head -n 20<|"|>}<tool_call|><|tool_response>
Turn 17at 321 s49 tokens out3,774 prompt tokens
Let's check `tests/test_sim.py`.
TOOL CALL · run_command
{
"command": "grep -rn \"Memory\" tests/test_sim.py | head -n 20"
}Result of run_command 283 characters
{
"status": "ok",
"stdout": "689: self.memory = Memory(width=8, depth=4, init=[0xaa, 0x55])\n805: self.memory = Memory(width=8, depth=4, init=[0xaa, 0x55])\n821: m.submodules.memory = memory = Memory(width=32, depth=4, init=init)\n",
"stderr": "",
"exit_code": 0
}Generated tokens 49 tokens · stopped: STOP
Let's check `tests/test_sim.py`.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "Memory" tests/test_sim.py | head -n 20<|"|>}<tool_call|><|tool_response>
Turn 18at 325 s62 tokens out3,957 prompt tokens
Okay, let's see how they are using `Memory` in `tests/test_sim.py`.
TOOL CALL · read_file
{
"end_line": 720,
"filepath": "tests/test_sim.py",
"start_line": 680
}Result of read_file 1,826 characters
{
"status": "ok",
"filepath": "tests/test_sim.py",
"content": " r\"Received unsupported command 1 from process .+?\"):\n yield 1\n yield Settle()\n survived = True\n sim.add_process(process)\n self.assertTrue(survived)\n\n def setUp_memory(self, rd_synchronous=True, rd_transparent=True, wr_granularity=None):\n self.m = Module()\n self.memory = Memory(width=8, depth=4, init=[0xaa, 0x55])\n self.m.submodules.rdport = self.rdport = \\\n self.memory.read_port(domain=\"sync\" if rd_synchronous else \"comb\",\n transparent=rd_transparent)\n self.m.submodules.wrport = self.wrport = \\\n self.memory.write_port(granularity=wr_granularity)\n\n def test_memory_init(self):\n self.setUp_memory()\n with self.assertSimulation(self.m) as sim:\n def process():\n yield self.rdport.addr.eq(1)\n yield\n yield\n self.assertEqual((yield self.rdport.data), 0x55)\n yield self.rdport.addr.eq(2)\n yield\n yield\n self.assertEqual((yield self.rdport.data), 0x00)\n sim.add_clock(1e-6)\n sim.add_sync_process(process)\n\n def test_memory_write(self):\n self.setUp_memory()\n with self.assertSimulation(self.m) as sim:\n def process():\n yield self.wrport.addr.eq(4)\n yield self.wrport.data.eq(0x33)\n yield self.wrport.en.eq(1)\n yield\n yield self.wrport.en.eq(0)\n yield self.rdport.addr.eq(4)",
"start_line": 680,
"end_line": 720,
"total_lines": 998,
"is_truncated": false
}Generated tokens 62 tokens · stopped: STOP
Okay, let's see how they are using `Memory` in `tests/test_sim.py`.
<channel|><|tool_call>call:read_file{filepath:<|"|>tests/test_sim.py<|"|>,start_line:680,end_line:720}<tool_call|><|tool_response>
Turn 19at 335 s127 tokens out4,570 prompt tokens
They are using `assertSimulation` which probably handles the `PySimEngine` setup. Let's see how `assertSimulation` is defined in `tests/test_sim.py` or where it's imported from. Or maybe it's in a base class. Looking at `tests/test_sim.py` again, I don't see the definition of `assertSimulation` in the read range.. Let me search for it.
TOOL CALL · run_command
{
"command": "grep -rn \"def assertSimulation\" tests/test_sim.py"
}Result of run_command 120 characters
{
"status": "ok",
"stdout": "414: def assertSimulation(self, module, deadline=None):\n",
"stderr": "",
"exit_code": 0
}Generated tokens 127 tokens · stopped: STOP
They are using `assertSimulation` which probably handles the `PySimEngine` setup.
Let's see how `assertSimulation` is defined in `tests/test_sim.py` or where it's imported from. Or maybe it's in a base class.
Looking at `tests/test_sim.py` again, I don't see the definition of `assertSimulation` in the read range.. Let me search for it.
<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "def assertSimulation" tests/test_sim.py<|"|>}<tool_call|><|tool_response>
Turn 20at 337 s56 tokens out4,752 prompt tokens
Let's read `assertSimulation` in `tests/test_sim.py`.
TOOL CALL · read_file
{
"end_line": 440,
"filepath": "tests/test_sim.py",
"start_line": 410
}Result of read_file 1,280 characters
{
"status": "ok",
"filepath": "tests/test_sim.py",
"content": "\n\nclass SimulatorIntegrationTestCase(FHDLTestCase):\n @contextmanager\n def assertSimulation(self, module, deadline=None):\n sim = Simulator(module)\n yield sim\n with sim.write_vcd(\"test.vcd\", \"test.gtkw\"):\n if deadline is None:\n sim.run()\n else:\n sim.run_until(deadline)\n\n def setUp_counter(self):\n self.count = Signal(3, reset=4)\n self.sync = ClockDomain()\n\n self.m = Module()\n self.m.d.sync += self.count.eq(self.count + 1)\n self.m.domains += self.sync\n\n def test_counter_process(self):\n self.setUp_counter()\n with self.assertSimulation(self.m) as sim:\n def process():\n self.assertEqual((yield self.count), 4)\n yield Delay(1e-6)\n self.assertEqual((yield self.count), 4)\n yield self.sync.clk.eq(1)\n self.assertEqual((yield self.count), 4)\n yield Settle()",
"start_line": 410,
"end_line": 440,
"total_lines": 998,
"is_truncated": false,
"budget_warning": "Only 10 tool call(s) remaining (20/30 used). Finalize your edits and call submit_patch soon."
}Generated tokens 56 tokens · stopped: STOP
Let's read `assertSimulation` in `tests/test_sim.py`.<channel|><|tool_call>call:read_file{end_line:440,filepath:<|"|>tests/test_sim.py<|"|>,start_line:410}<tool_call|><|tool_response>
Turn 21at 391 s845 tokens out5,209 prompt tokens
Wait, `Simulator` is imported from `.sim`. Let's check `amaranth/sim/__init__.py` or `amaranth/sim/core.py` to see what `Simulator` is. In `amaranth/sim/core.py`, I saw `__all__ = ["Settle", "Delay", "Tick", "Passive", "Active", "Simulator"]`. Wait, I didn't see `Simulator` defined in `amaranth/sim/core.py` in the first `cat` output. Let me look further down. But wait, I can just use `PySimEngine` if I want to reproduce. Or better yet, I'll write a standalone script using `Simulator` if it's available. Actually, let's try to reproduce the bug as described: Writing to address 2, reading from address 1. Reading from address 1 should not be affected by writing to address 2. Here is a reproduction script I'll write to `/tmp/repro.py`.
TOOL CALL · write_file
{
"content": "\nfrom amaranth import hdl\nfrom amaranth.sim import Simulator\n\nclass MemRepro(hdl.Elaboratable):\n def __init__(self):\n self.mem = None\n self.read_port = None\n self.write_port = None\n\n def elaborate(self, platform):\n m = hdl.Module()\n self.mem = hdl.Memory(width=8, depth=8)\n self.read_port = self.mem.read_port()\n self.write_port = self.mem.write_port()\n m.submodules.read_port = self.read_port\n m.submodules.write_port = self.write_port\n return m\n\ndef process(dut):\n # Initialize memory\n # The memory is initialized to 0 by default in simulation.\n \n # Read from addr 1\n yield dut.read_port.addr.eq(1)\n yield hdl.Tick() # Advance clock\n # For synchronous read, we might need another tick or settle\n # Let's check the current value.\n val1_init = yield dut.read_port.data\n print(f\"Initial read from addr 1: {val1_init}\")\n\n # Now write to addr 2 while reading from addr 1\n yield dut.read_port.addr.eq(1)\n yield dut.write_port.addr.eq(2)\n yield dut.write_port.data.eq(0xAA)\n yield dut.write_port.en.eq(1)\n \n yield hdl.Tick() # Clock edge: write happening, read might be updated\n \n val1_during_write = yield dut.read_port.data\n print(f\"Read from addr 1 while writing 0xAA to addr 2: {val1_during_write}\")\n \n if val1_during_write == 0xAA:\n print(\"BUG DETECTED: Read port 1 got value written to port 2!\")\n else:\n print(\"No bug detected.\")\n\n yield dut.write_port.en.eq(0)\n yield hdl.Tick()\n \n val1_after_write = yield dut.read_port.data\n print(f\"Read from addr 1 after write: {val1_after_write}\")\n\ndut = MemRepro()\nsim = Simulator(dut)\nsim.add_clock(1e-6)\nsim.add_sync_process(process, dut)\nsim.run()\n",
"filepath": "/tmp/repro.py"
}Result of write_file 249 characters
{
"status": "error",
"error_type": "FileWriteError",
"error_message": "Path traversal detected: '/tmp/repro.py' escapes workspace root.",
"budget_warning": "Only 9 tool call(s) remaining (21/30 used). Finalize your edits and call submit_patch soon."
}Generated tokens 845 tokens · stopped: STOP
Wait, `Simulator` is imported from `.sim`.
Let's check `amaranth/sim/__init__.py` or `amaranth/sim/core.py` to see what `Simulator` is.
In `amaranth/sim/core.py`, I saw `__all__ = ["Settle", "Delay", "Tick", "Passive", "Active", "Simulator"]`.
Wait, I didn't see `Simulator` defined in `amaranth/sim/core.py` in the first `cat` output. Let me look further down.
But wait, I can just use `PySimEngine` if I want to reproduce.
Or better yet, I'll write a standalone script using `Simulator` if it's available.
Actually, let's try to reproduce the bug as described:
Writing to address 2, reading from address 1.
Reading from address 1 should not be affected by writing to address 2.
Here is a reproduction script I'll write to `/tmp/repro.py`.<channel|><|tool_call>call:write_file{content:<|"|>
from amaranth import hdl
from amaranth.sim import Simulator
class MemRepro(hdl.Elaboratable):
def __init__(self):
self.mem = None
self.read_port = None
self.write_port = None
def elaborate(self, platform):
m = hdl.Module()
self.mem = hdl.Memory(width=8, depth=8)
self.read_port = self.mem.read_port()
self.write_port = self.mem.write_port()
m.submodules.read_port = self.read_port
m.submodules.write_port = self.write_port
return m
def process(dut):
# Initialize memory
# The memory is initialized to 0 by default in simulation.
# Read from addr 1
yield dut.read_port.addr.eq(1)
yield hdl.Tick() # Advance clock
# For synchronous read, we might need another tick or settle
# Let's check the current value.
val1_init = yield dut.read_port.data
print(f"Initial read from addr 1: {val1_init}")
# Now write to addr 2 while reading from addr 1
yield dut.read_port.addr.eq(1)
yield dut.write_port.addr.eq(2)
yield dut.write_port.data.eq(0xAA)
yield dut.write_port.en.eq(1)
yield hdl.Tick() # Clock edge: write happening, read might be updated
val1_during_write = yield dut.read_port.data
print(f"Read from addr 1 while writing 0xAA to addr 2: {val1_during_write}")
if val1_during_write == 0xAA:
print("BUG DETECTED: Read port 1 got value written to port 2!")
else:
print("No bug detected.")
yield dut.write_port.en.eq(0)
yield hdl.Tick()
val1_after_write = yield dut.read_port.data
print(f"Read from addr 1 after write: {val1_after_write}")
dut = MemRepro()
sim = Simulator(dut)
sim.add_clock(1e-6)
sim.add_sync_process(process, dut)
sim.run()
<|"|>,filepath:<|"|>/tmp/repro.py<|"|>}<tool_call|><|tool_response>
Turn 22at 412 s641 tokens out6,143 prompt tokens
Ah, I cannot write to `/tmp/`. I must write to `/workspace` but I must remember to remove it before `submit_patch`. Or better, use `python3 - <<'PY'`. Let me try to run the reproduction using `python3 - <<'PY'`. Wait, I need to make sure `amaranth` is in the python path.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nfrom amaranth import hdl\nfrom amaranth.sim import Simulator\n\nclass MemRepro(hdl.Elaboratable):\n def __init__(self):\n self.mem = None\n self.read_port = None\n self.write_port = None\n\n def elaborate(self, platform):\n m = hdl.Module()\n self.mem = hdl.Memory(width=8, depth=8)\n self.read_port = self.mem.read_port()\n self.write_port = self.mem.write_port()\n m.submodules.read_port = self.read_port\n m.submodules.write_port = self.write_port\n return m\n\ndef process(dut):\n # Initialize memory\n # Read from addr 1\n yield dut.read_port.addr.eq(1)\n yield hdl.Tick()\n val1_init = yield dut.read_port.data\n print(f\"Initial read from addr 1: {val1_init}\")\n\n # Now write to addr 2 while reading from addr 1\n yield dut.read_port.addr.eq(1)\n yield dut.write_port.addr.eq(2)\n yield dut.write_port.data.eq(0xAA)\n yield dut.write_port.en.eq(1)\n \n yield hdl.Tick()\n \n val1_during_write = yield dut.read_port.data\n print(f\"Read from addr 1 while writing 0xAA to addr 2: {val1_during_write}\")\n \n if val1_during_write == 0xAA:\n print(\"BUG DETECTED: Read port 1 got value written to port 2!\")\n else:\n print(\"No bug detected.\")\n\n yield dut.write_port.en.eq(0)\n yield hdl.Tick()\n \n val1_after_write = yield dut.read_port.data\n print(f\"Read from addr 1 after write: {val1_after_write}\")\n\ndut = MemRepro()\nsim = Simulator(dut)\nsim.add_clock(1e-6)\nsim.add_sync_process(process, dut)\nsim.run()\nPY\n"
}Result of run_command 570 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "Traceback (most recent call last):\n File \"<stdin>\", line 52, in <module>\nTypeError: Simulator.add_sync_process() takes 2 positional arguments but 3 were given\n",
"details": {
"stdout": "",
"stderr": "Traceback (most recent call last):\n File \"<stdin>\", line 52, in <module>\nTypeError: Simulator.add_sync_process() takes 2 positional arguments but 3 were given\n",
"exit_code": 1
},
"budget_warning": "Only 8 tool call(s) remaining (22/30 used). Finalize your edits and call submit_patch soon."
}Generated tokens 641 tokens · stopped: STOP
Ah, I cannot write to `/tmp/`. I must write to `/workspace` but I must remember to remove it before `submit_patch`. Or better, use `python3 - <<'PY'`.
Let me try to run the reproduction using `python3 - <<'PY'`.
Wait, I need to make sure `amaranth` is in the python path.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
from amaranth import hdl
from amaranth.sim import Simulator
class MemRepro(hdl.Elaboratable):
def __init__(self):
self.mem = None
self.read_port = None
self.write_port = None
def elaborate(self, platform):
m = hdl.Module()
self.mem = hdl.Memory(width=8, depth=8)
self.read_port = self.mem.read_port()
self.write_port = self.mem.write_port()
m.submodules.read_port = self.read_port
m.submodules.write_port = self.write_port
return m
def process(dut):
# Initialize memory
# Read from addr 1
yield dut.read_port.addr.eq(1)
yield hdl.Tick()
val1_init = yield dut.read_port.data
print(f"Initial read from addr 1: {val1_init}")
# Now write to addr 2 while reading from addr 1
yield dut.read_port.addr.eq(1)
yield dut.write_port.addr.eq(2)
yield dut.write_port.data.eq(0xAA)
yield dut.write_port.en.eq(1)
yield hdl.Tick()
val1_during_write = yield dut.read_port.data
print(f"Read from addr 1 while writing 0xAA to addr 2: {val1_during_write}")
if val1_during_write == 0xAA:
print("BUG DETECTED: Read port 1 got value written to port 2!")
else:
print("No bug detected.")
yield dut.write_port.en.eq(0)
yield hdl.Tick()
val1_after_write = yield dut.read_port.data
print(f"Read from addr 1 after write: {val1_after_write}")
dut = MemRepro()
sim = Simulator(dut)
sim.add_clock(1e-6)
sim.add_sync_process(process, dut)
sim.run()
PY
<|"|>}<tool_call|><|tool_response>
Turn 23at 431 s599 tokens out6,972 prompt tokens
Okay, `add_sync_process` takes 2 arguments. I gave it `(process, dut)`. It should probably be just `process`. Let's try again.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nfrom amaranth import hdl\nfrom amaranth.sim import Simulator\n\nclass MemRepro(hdl.Elaboratable):\n def __init__(self):\n self.mem = None\n self.read_port = None\n self.write_port = None\n\n def elaborate(self, platform):\n m = hdl.Module()\n self.mem = hdl.Memory(width=8, depth=8)\n self.read_port = self.mem.read_port()\n self.write_port = self.mem.write_port()\n m.submodules.read_port = self.read_port\n m.submodules.write_port = self.write_port\n return m\n\ndef process(dut):\n # Initialize memory\n # Read from addr 1\n yield dut.read_port.addr.eq(1)\n yield hdl.Tick()\n val1_init = yield dut.read_port.data\n print(f\"Initial read from addr 1: {val1_init}\")\n\n # Now write to addr 2 while reading from addr 1\n yield dut.read_port.addr.eq(1)\n yield dut.write_port.addr.eq(2)\n yield dut.write_port.data.eq(0xAA)\n yield dut.write_port.en.eq(1)\n \n yield hdl.Tick()\n \n val1_during_write = yield dut.read_port.data\n print(f\"Read from addr 1 while writing 0xAA to addr 2: {val1_during_write}\")\n \n if val1_during_write == 0xAA:\n print(\"BUG DETECTED: Read port 1 got value written to port 2!\")\n else:\n print(\"No bug detected.\")\n\n yield dut.write_port.en.eq(0)\n yield hdl.Tick()\n \n val1_after_write = yield dut.read_port.data\n print(f\"Read from addr 1 after write: {val1_after_write}\")\n\ndut = MemRepro()\nsim = Simulator(dut)\nsim.add_clock(1e-6)\nsim.add_sync_process(process)\nsim.run()\nPY\n"
}Result of run_command 1,842 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "Traceback (most recent call last):\n File \"<stdin>\", line 53, in <module>\n File \"/workspace/amaranth/sim/core.py\", line 172, in run\n while self.advance():\n File \"/workspace/amaranth/sim/core.py\", line 163, in advance\n return self._engine.advance()\n File \"/workspace/amaranth/sim/pysim.py\", line 319, in advance\n self._step()\n File \"/workspace/amaranth/sim/pysim.py\", line 308, in _step\n process.run()\n File \"/workspace/amaranth/sim/_pycoro.py\", line 125, in run\n self.coroutine.throw(exn)\n File \"/workspace/amaranth/sim/_pycoro.py\", line 64, in run\n command = self.coroutine.send(response)\n File \"/workspace/amaranth/sim/core.py\", line 91, in wrapper\n yield from process()\nTypeError: process() missing 1 required positional argument: 'dut'\n",
"details": {
"stdout": "",
"stderr": "Traceback (most recent call last):\n File \"<stdin>\", line 53, in <module>\n File \"/workspace/amaranth/sim/core.py\", line 172, in run\n while self.advance():\n File \"/workspace/amaranth/sim/core.py\", line 163, in advance\n return self._engine.advance()\n File \"/workspace/amaranth/sim/pysim.py\", line 319, in advance\n self._step()\n File \"/workspace/amaranth/sim/pysim.py\", line 308, in _step\n process.run()\n File \"/workspace/amaranth/sim/_pycoro.py\", line 125, in run\n self.coroutine.throw(exn)\n File \"/workspace/amaranth/sim/_pycoro.py\", line 64, in run\n command = self.coroutine.send(response)\n File \"/workspace/amaranth/sim/core.py\", line 91, in wrapper\n yield from process()\nTypeError: process() missing 1 required positional argument: 'dut'\n",
"exit_code": 1
},
"budget_warning": "Only 7 tool call(s) remaining (23/30 used). Finalize your edits and call submit_patch soon."
}Generated tokens 599 tokens · stopped: STOP
Okay, `add_sync_process` takes 2 arguments. I gave it `(process, dut)`. It should probably be just `process`.
Let's try again.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
from amaranth import hdl
from amaranth.sim import Simulator
class MemRepro(hdl.Elaboratable):
def __init__(self):
self.mem = None
self.read_port = None
self.write_port = None
def elaborate(self, platform):
m = hdl.Module()
self.mem = hdl.Memory(width=8, depth=8)
self.read_port = self.mem.read_port()
self.write_port = self.mem.write_port()
m.submodules.read_port = self.read_port
m.submodules.write_port = self.write_port
return m
def process(dut):
# Initialize memory
# Read from addr 1
yield dut.read_port.addr.eq(1)
yield hdl.Tick()
val1_init = yield dut.read_port.data
print(f"Initial read from addr 1: {val1_init}")
# Now write to addr 2 while reading from addr 1
yield dut.read_port.addr.eq(1)
yield dut.write_port.addr.eq(2)
yield dut.write_port.data.eq(0xAA)
yield dut.write_port.en.eq(1)
yield hdl.Tick()
val1_during_write = yield dut.read_port.data
print(f"Read from addr 1 while writing 0xAA to addr 2: {val1_during_write}")
if val1_during_write == 0xAA:
print("BUG DETECTED: Read port 1 got value written to port 2!")
else:
print("No bug detected.")
yield dut.write_port.en.eq(0)
yield hdl.Tick()
val1_after_write = yield dut.read_port.data
print(f"Read from addr 1 after write: {val1_after_write}")
dut = MemRepro()
sim = Simulator(dut)
sim.add_clock(1e-6)
sim.add_sync_process(process)
sim.run()
PY
<|"|>}<tool_call|><|tool_response>
Patch, tests and logs
Final code change Included
Test output Missing
Not saved for this rollout. Nothing has been inferred or reconstructed.
Test errors Missing
Not saved for this rollout. Nothing has been inferred or reconstructed.
Test report (JUnit) Missing
Not saved for this rollout. Nothing has been inferred or reconstructed.
Agent log Included
[ 0.0s] 📋 System Prompt: You are a principal Python software engineer resolving a repository issue in `/workspace`.
[ 0.0s] 🎯 Task Prompt: You are evaluating a software engineering task for repository amaranth-lang/amaranth.
[ 67.5s] 💭 (3693 chars) "The user is reporting an issue with `Memory` simulation in Amaranth.
Writing to one memory address seems to affect readi..."
[ 67.5s] 🔧 run_command grep -rn --include="*.py" "Memory" amaranth/hdl/mem.py amaranth/sim/_pyrtl.py
[ 67.6s] → amaranth/hdl/mem.py:9:__all__ = ["Memory", "ReadPort", "WritePort", "DummyPort"]
[ 71.2s] 💭 (113 chars) "The `grep` didn't show `Memory` in `amaranth/sim/_pyrtl.py`. Let me search for `Memory` in
all of `amaranth/sim`."
[ 71.2s] 🔧 run_command grep -rn "Memory" amaranth/sim/
[ 71.3s] → error (exit 0):
[ 79.7s] 💭 (388 chars) "Wait, `grep -rn "Memory" amaranth/sim/` failed? That's strange. Maybe it's called something
else in the simulator.
Let'..."
[ 79.7s] 🔧 run_command grep -rn "mem" amaranth/sim/ | head -n 20
[ 79.7s] 🔧
[ 92.3s] 💭 (560 chars) "That's very weird. `grep` is returning nothing. Maybe my `grep` command is wrong or the
directory structure is different..."
[ 92.3s] 🔧 run_command grep -rn "TestCaseWithSimulator" amaranth/sim/
[ 92.4s] → error (exit 0):
[ 96.6s] 💭 (191 chars) "Still nothing? Maybe it's not in `amaranth/sim/` but in `tests/`?
No, the user said " unit tests use amaranth tests fram..."
[ 96.6s] 🔧 run_command grep -rn "TestCaseWithSimulator" .
[ 96.6s] → error (exit 0):
[ 100.4s] 💭 (79 chars) "This is extremely strange. Is `grep` working?
Let me try `ls -R amaranth/sim/`."
[ 100.4s] 🔧 run_command ls -R amaranth/sim/
[ 100.5s] → amaranth/sim/:
[ 103.7s] 💭 (75 chars) "Okay, files are there. Let me try `grep -l "class " amaranth/sim/pysim.py`."
[ 103.7s] 🔧 run_command grep -l "class " amaranth/sim/pysim.py
[ 103.7s] → amaranth/sim/pysim.py
[ 114.9s] 💭 (423 chars) "Wait, if `grep -l "class " amaranth/sim/pysim.py` works, why did `grep -rn "Memory"
amaranth/sim/` fail?
Ah, maybe I sho..."
[ 114.9s] 🔧 run_command cat amaranth/sim/pysim.py | head -n 50
[ 114.9s] → from contextlib import contextmanager
[ 124.1s] 💭 (369 chars) "`PySimEngine` is here.
Let's search for `TestCaseWithSimulator` in the whole repository again, but more carefully.
Actu..."
[ 124.1s] 📖 read_file (amaranth/hdl/mem.py)
[ 124.2s] ✓ {'status': 'ok', 'filepath': 'amaranth/hdl/mem.py', 'content': 'import operator\nfrom collections import
OrderedDict\n\n…
[ 141.7s] 💭 (543 chars) "`Memory` has an `_array` which is an `Array` of `Signal`s.
```python
# Array of signals for simulation.
..."
[ 141.7s] 📖 read_file (amaranth/hdl/mem.py)
[ 141.8s] ✓ {'status': 'ok', 'filepath': 'amaranth/hdl/mem.py', 'content': ' p_RD_ARST_VALUE=Const(0,
len(self._read_port…
[ 144.7s] 💭 (28 chars) "And the rest of `WritePort`."
[ 144.7s] 📖 read_file (amaranth/hdl/mem.py)
[ 144.7s] ✓ {'status': 'ok', 'filepath': 'amaranth/hdl/mem.py', 'content': ' def __init__(self, memory, *,
domain="sync", granula…
[ 224.3s] 💭 (4903 chars) "Now let's analyze how `Memory` simulation works in ` elaborate`.
```python
for port in self._read_ports:
..."
[ 224.3s] 🔧 run_command cat amaranth/sim/pysim.py | grep -C 5 "PySimEngine"
[ 224.4s] → from ._pyrtl import _FragmentCompiler
[ 251.3s] 💭 (1139 chars) "Okay, `PySimEngine` takes a `fragment`.
Let's try to build a reproduction script.
I'll need `Elaboratable`, `Module`, `..."
[ 251.3s] 🔧 run_command grep -rn "class TestCaseWithSimulator" .
[ 251.4s] → error (exit 0):
[ 258.4s] 💭 (369 chars) "Okay, it's not in the repo. Maybe it's because the user is using a different version or they
have their own base class.
..."
[ 258.4s] 🔧 run_command cat amaranth/sim/core.py | head -n 50
[ 258.4s] → import inspect
[ 265.4s] 💭 (234 chars) "I'll try to write a minimal reproduction script using `amaranth.sim.PySimEngine` and
`amaranth.hdl`.
Since I don't have ..."
[ 265.4s] 🔧 run_command find tests/ -name "*test*.py" | head -n 20
[ 265.5s] → tests/test_lib_coding.py
[ 318.7s] 💭 (134 chars) "`tests/test_sim.py` seems like a good place to look for how simulations are run.
Also `tests/test_hdl_dsl.py` might have..."
[ 318.7s] 🔧 run_command grep -rn "Memory" tests/test_hdl_dsl.py | head -n 20
[ 318.7s] 🔧
[ 320.5s] 💭 (32 chars) "Let's check `tests/test_sim.py`."
[ 320.5s] 🔧 run_command grep -rn "Memory" tests/test_sim.py | head -n 20
[ 320.5s] → 689: self.memory = Memory(width=8, depth=4, init=[0xaa, 0x55])
[ 324.1s] 💭 (67 chars) "Okay, let's see how they are using `Memory` in `tests/test_sim.py`."
[ 324.1s] 📖 read_file (tests/test_sim.py)
[ 324.2s] ✓ {'status': 'ok', 'filepath': 'tests/test_sim.py', 'content': ' r"Received
unsupported command 1 f…
[ 334.6s] 💭 (337 chars) "They are using `assertSimulation` which probably handles the `PySimEngine` setup.
Let's see how `assertSimulation` is de..."
[ 334.6s] 🔧 run_command grep -rn "def assertSimulation" tests/test_sim.py
[ 334.6s] → 414: def assertSimulation(self, module, deadline=None):
[ 336.7s] 💭 (53 chars) "Let's read `assertSimulation` in `tests/test_sim.py`."
[ 336.7s] 📖 read_file (tests/test_sim.py)
[ 336.7s] ✓ {'status': 'ok', 'filepath': 'tests/test_sim.py', 'content': '\n\nclass
SimulatorIntegrationTestCase(FHDLTestCase):\n …
[ 390.8s] 💭 (743 chars) "Wait, `Simulator` is imported from `.sim`.
Let's check `amaranth/sim/__init__.py` or `amaranth/sim/core.py` to see what ..."
[ 390.8s] 📝 write_file (/tmp/repro.py, 58 lines)
[ 390.8s] ❌ {'status': 'error', 'error_type': 'FileWriteError', 'error_message': "Path traversal detected:
'/tmp/repro.py' escapes w…
[ 411.9s] 💭 (272 chars) "Ah, I cannot write to `/tmp/`. I must write to `/workspace` but I must remember to remove it
before `submit_patch`. Or b..."
[ 411.9s] 🔧 run_command (55 lines) python3 - <<'PY'
[ 412.2s] → error (exit 0):
[ 430.2s] 💭 (127 chars) "Okay, `add_sync_process` takes 2 arguments. I gave it `(process, dut)`. It should probably
be just `process`.
Let's try..."
[ 430.2s] 🔧 run_command (55 lines) python3 - <<'PY'
[ 430.3s] → error (exit 0):
Native result row
{
"agent_error": "Agent exceeded session timeout (7.5 min)",
"duration_seconds": 452.8,
"error": "Empty agent patch",
"grade": {
"error": "Empty agent patch",
"resolved": false,
"strict_clean_patch": false,
"test_exit_code": -1
},
"instance_id": "amaranth-lang__amaranth-923",
"pass_idx": 0,
"patch_chars": 0,
"phase1_seconds": 452.8,
"repo": "amaranth-lang/amaranth",
"request_log_path": "/kaggle-root/working/r31/rollouts_X/requests/amaranth-lang__amaranth-923__p0__r3.jsonl",
"resolved": false,
"rollout_idx": 3,
"run_key": "amaranth-lang__amaranth-923__p0__r3",
"strict_clean_patch": false,
"tool_calls": 23,
"total_llm_calls": 23,
"trace_path": "/kaggle-root/working/r31/rollouts_X/traces/trace_amaranth-lang__amaranth-923__p0__r3.json"
}