Refactor: give each runtime its own TaskId type by poursoul · Pull Request #2087 · hw-native-sys/simpler

poursoul · 2026-09-01T08:44:32Z

What

TaskId was one global-namespace struct in src/common/task_interface/, shared by both runtimes, with each runtime's bit layout supplied separately by a task_id_encoding.h of free functions.

Nothing in task_interface/ used the type, and all 15 includers were runtime-specific — the sharing was historical rather than structural. The two layouts also gave the same 32 high bits two different meanings (a ring index in tmr, an id space in hbg).

Each runtime now declares its own TaskId in its own common directory, next to the Tensor that already lives there, carrying its encoding as members:

	hbg	tmr
mint	`TaskId::make_global(int32_t)` `TaskId::make_in_graph(graph_task_id, in_graph_local_id)`	`TaskId::make(uint8_t ring, uint32_t local)`
read	`space()` / `is_global()` / `local_id()`	`ring()` / `local_id()`
both	`is_valid()` / `invalid()` / `==` / `!=`

Deleted: task_interface/task_id.h, host_build_graph/task_id_encoding.h, tensormap_and_ringbuffer/task_id_encoding.h.

Why

The type now names its runtime, so call sites drop the simpler::<rt>:: qualification the free functions required:

// before
if (!simpler::hbg::is_global_task(producer)) ...
const int32_t prod_local = simpler::hbg::task_local_id(producer_task_id);

// after
if (!producer.is_global()) ...
const int32_t prod_local = producer_task_id.local_id();

Namespacing the two also keeps their mintings off one mangled symbol. Members on a global TaskId would collide: the Itanium ABI does not encode return types, so hbg's local_id() returning int32_t and tmr's returning uint32_t would both mangle to _ZNK6TaskId8local_idEv.

Callers are unchanged

src/common is on every target's include path, so nothing there stops a translation unit from reaching both headers. A trailing using-declaration in each is what does the work: the unqualified name keeps resolving to the including runtime's type, so orchestration sources and generated kernels — 1646 bare TaskId occurrences across 6 generated and 31 hand-written files — need no change, and neither does codegen.

Two such declarations in one scope are ill-formed, so a build that reaches both runtimes fails at compile time rather than silently binding one:

src/common/tensormap_and_ringbuffer/task_id.h:75:21: error:
  'struct simpler::tmr::TaskId' conflicts with a previous declaration

Also

hbg's in-graph vocabulary follows the encoding the type now spells out. ChipTaskSlotState::in_graph_task_index becomes in_graph_local_id and IN_GRAPH_TASK_INDEX_BITS becomes IN_GRAPH_LOCAL_ID_BITS, so the value make_in_graph() packs into the low field and the value the scheduler reads back carry one name. The swimlane converter's graph_execution trace args follow (visible_in_graph_local_id_{min,max}, synthetic_id_layout).

is_invalid() is dropped in favour of !is_valid(). Its 15 call sites are all early-return guards, where the negation reads the same. is_valid() stays because it is what generated kernels emit (~1000 uses).

Test


4 platform×runtime builds (a2a3sim/a5sim × hbg/tmr)	pass
`ctest` cpput	127/127 pass
`examples + tests/st --platform a2a3sim`	pass, 0 failures
`examples + tests/st --platform a5sim`	pass, 0 failures
pre-commit	pass

Re-verified after the in_graph_local_id rename.

coderabbitai · 2026-09-01T08:45:29Z

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📝 Walkthrough

Walkthrough

The change introduces dedicated HBG and TMR TaskId headers, removes legacy encoding headers, migrates runtime and test call sites to member APIs, and updates related documentation and workflow formatting.

Changes

TaskId API migration

Layer / File(s)	Summary
HBG TaskId contract and runtime migration `src/common/host_build_graph/...`, `src/a2a3/runtime/host_build_graph/...`, `src/a5/runtime/host_build_graph/...`	Adds the HBG `TaskId` type, removes `task_id_encoding.h`, and updates HBG construction, extraction, validity, and include paths.
TMR TaskId contract and runtime migration `src/common/tensormap_and_ringbuffer/...`, `src/a2a3/runtime/tensormap_and_ringbuffer/...`, `src/a5/runtime/tensormap_and_ringbuffer/...`	Adds the TMR `TaskId` type, removes legacy helpers, and migrates orchestration, tensor-map, wait, and completion code.
TaskId migration validation `tests/st/...`, `tests/ut/...`	Updates system and unit tests to use `TaskId::make`, `TaskId::make_global`, `TaskId::make_in_graph`, `ring()`, `local_id()`, `space()`, and `is_valid()`.
Documentation and workflow alignment `.claude/...`, `docs/...`, `simpler_setup/...`, `src/*/docs/...`	Updates header references, terminology, examples, branch steps, and whitespace formatting.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 2de31

The refactor gives HBG and TMR distinct TaskId types while preserving existing wire layouts, with the supplied builds and tests passing. A minor numbering inconsistency in contributor documentation remains, but no actionable merge-blocking risk remains.

Poem

A rabbit hops through headers bright
New TaskIds pack the bits just right
Old helper paths fade away
Tests follow the modern way
Rings and locals dance in flight
Documentation shines tonight

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 70 functions across 50 files. (24 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description clearly explains the runtime-specific TaskId refactor, API migration, removed headers, compatibility approach, and test results.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: each runtime now owns its own TaskId type.

Full details: Docstring Coverage

Explanation

Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 70 functions across 50 files. (24 skipped: 7 unsupported, 17 over the file limit.)

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Inline comments:
In @.claude/lib/github/branch-naming.md:
- Around line 19-21: Renumber the two workflow steps in the branch-naming
instructions sequentially: change the first shown step from 1 to 2 and the
following step from 2 to 3, preserving their text and the existing step 1.

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📥 Commits

Reviewing files that changed from the base of the PR and between 95fb452 and 2de318b.

📒 Files selected for processing (77)

.claude/lib/github/branch-naming.md
.claude/skills/github-pr/SKILL.md
docs/dfx/dep-gen.md
simpler_setup/tools/swimlane_converter.py
src/a2a3/runtime/host_build_graph/common/intrinsic.h
src/a2a3/runtime/host_build_graph/docs/profiling_levels.md
src/a2a3/runtime/host_build_graph/runtime/aicore_completion_mailbox.h
src/a2a3/runtime/host_build_graph/runtime/async_kernel_api.h
src/a2a3/runtime/host_build_graph/runtime/backend/sdma/sdma_completion_kernel.h
src/a2a3/runtime/host_build_graph/runtime/scheduler/scheduler.h
src/a2a3/runtime/tensormap_and_ringbuffer/common/intrinsic.h
src/a2a3/runtime/tensormap_and_ringbuffer/docs/MULTI_RING.md
src/a2a3/runtime/tensormap_and_ringbuffer/host/dep_gen_replay.cpp
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/aicore_completion_mailbox.h
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/async_kernel_api.h
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/backend/sdma/sdma_completion_kernel.h
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/dep_compute.h
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/orchestrator.cpp
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/runtime_core.cpp
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/runtime_types.h
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/shared/tensormap.cpp
src/a2a3/runtime/tensormap_and_ringbuffer/runtime/tensormap.h
src/a5/runtime/host_build_graph/common/intrinsic.h
src/a5/runtime/host_build_graph/docs/profiling_levels.md
src/a5/runtime/host_build_graph/runtime/aicore_completion_mailbox.h
src/a5/runtime/host_build_graph/runtime/async_kernel_api.h
src/a5/runtime/host_build_graph/runtime/backend/sdma/sdma_completion_kernel.h
src/a5/runtime/host_build_graph/runtime/scheduler/scheduler.h
src/a5/runtime/tensormap_and_ringbuffer/common/intrinsic.h
src/a5/runtime/tensormap_and_ringbuffer/docs/MULTI_RING.md
src/a5/runtime/tensormap_and_ringbuffer/host/dep_gen_replay.cpp
src/a5/runtime/tensormap_and_ringbuffer/runtime/aicore_completion_mailbox.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/async_kernel_api.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/backend/sdma/sdma_completion_kernel.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/backend/urma/urma_completion_kernel.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/dep_compute.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/orchestrator.cpp
src/a5/runtime/tensormap_and_ringbuffer/runtime/ring_buffer.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/runtime_core.cpp
src/a5/runtime/tensormap_and_ringbuffer/runtime/runtime_types.h
src/a5/runtime/tensormap_and_ringbuffer/runtime/shared/tensormap.cpp
src/a5/runtime/tensormap_and_ringbuffer/runtime/tensormap.h
src/common/host_build_graph/dep_compute.h
src/common/host_build_graph/dep_gen_host_graph.h
src/common/host_build_graph/device/graph_execution.cpp
src/common/host_build_graph/graph_cache.h
src/common/host_build_graph/graph_execution.h
src/common/host_build_graph/runtime_types.h
src/common/host_build_graph/shared/orchestrator.cpp
src/common/host_build_graph/shared/runtime_core.cpp
src/common/host_build_graph/task_id.h
src/common/host_build_graph/task_id_encoding.h
src/common/host_build_graph/tensor.h
src/common/host_build_graph/tensormap.h
src/common/task_interface/task_id.h
src/common/tensormap_and_ringbuffer/task_id.h
src/common/tensormap_and_ringbuffer/task_id_encoding.h
src/common/tensormap_and_ringbuffer/tensor.h
tests/st/host_build_graph_validation/kernels/orchestration/validation_orch.cpp
tests/ut/cpp/a2a3/test_graph_activation.cpp
tests/ut/cpp/a2a3/test_hbg_submit_poison.cpp
tests/ut/cpp/a2a3/test_hbg_tensormap.cpp
tests/ut/cpp/a2a3/test_orchestrator_fanin.cpp
tests/ut/cpp/a2a3/test_tensormap.cpp
tests/ut/cpp/a5/test_graph_activation.cpp
tests/ut/cpp/a5/test_hbg_scheduler_contracts.cpp
tests/ut/cpp/a5/test_hbg_submit_poison.cpp
tests/ut/cpp/a5/test_orchestrator_fanin.cpp
tests/ut/cpp/a5/test_tensormap.cpp
tests/ut/cpp/a5/test_wiring.cpp
tests/ut/cpp/common/test_dep_gen_replay.cpp
tests/ut/cpp/common/test_hbg_graph_cache.cpp
tests/ut/cpp/common/test_hbg_graph_recording_bounds.cpp
tests/ut/cpp/common/test_hbg_graph_submit_failure.cpp
tests/ut/cpp/common/test_hbg_slot_claim.cpp
tests/ut/cpp/common/test_hbg_sm_compaction.cpp
tests/ut/cpp/common/test_scope_deadlock_detection.cpp

💤 Files with no reviewable changes (3)

src/common/task_interface/task_id.h
src/common/tensormap_and_ringbuffer/task_id_encoding.h
src/common/host_build_graph/task_id_encoding.h

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TaskId was one global-namespace struct in task_interface/, shared by both runtimes, with each runtime's bit layout supplied separately by a task_id_encoding.h of free functions. Nothing in task_interface used the type and every includer was runtime-specific, so the sharing was historical rather than structural -- and the two layouts meant two different meanings for the same 32 high bits. Each runtime now declares its own TaskId in its own common directory, next to the Tensor that already lives there, carrying its encoding as members: simpler::hbg::TaskId make_global / make_in_graph / space / is_global simpler::tmr::TaskId make / ring both local_id / is_valid / invalid The type now names its runtime, so call sites drop the simpler::<rt>:: qualification the free functions required. The two mintings also stop sharing a mangled symbol, which they did because the Itanium ABI does not encode return types. src/common is on every target's include path, so include-path scoping alone does not keep the two headers apart. The trailing using-declaration is what does: two of them in one scope are ill-formed, so a build that reaches both runtimes fails at compile time rather than silently binding one. Because the unqualified name still resolves, orchestration sources and generated kernels are unchanged -- which is the reason TaskId carries such a declaration where the Tensor beside it does not, since codegen has no runtime to qualify with. An in-graph task's own identifier is named in_graph_local_id throughout, replacing in_graph_task_index on ChipTaskSlotState and IN_GRAPH_TASK_INDEX_BITS on the encoding, so the field, the constant and make_in_graph's parameter all spell the same concept the same way. is_invalid() is dropped in favour of !is_valid(). Its fifteen call sites are all early-return guards, where the negation reads the same.

coderabbitai Bot reviewed Sep 1, 2026

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Comment thread .claude/lib/github/branch-naming.md

poursoul force-pushed the task-id-per-runtime branch from 2de318b to fadd06b Compare September 1, 2026 09:22

poursoul force-pushed the task-id-per-runtime branch from fadd06b to f8f1007 Compare September 1, 2026 09:24

zhusy54 approved these changes Sep 1, 2026

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poursoul merged commit 8f1e50c into hw-native-sys:main Sep 2, 2026
20 checks passed

zhusy54 mentioned this pull request Sep 2, 2026

Update: switch A5 HBG single-lane scheduling to AICore #2090

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Refactor: give each runtime its own TaskId type - #2087

Refactor: give each runtime its own TaskId type#2087
poursoul merged 1 commit into
hw-native-sys:mainfrom
poursoul:task-id-per-runtime

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