cnc_wams/wasm-port/docs/compatibility-validation.md

Compatibility Validation

Purpose

This document records how the standalone LinuxCNC WASM port currently proves that migrated behavior remains tied to LinuxCNC source code and fixture semantics.

The primary native validation command is:

wasm-port/tests/native/verify_native_probes.sh

The native LinuxCNC nc_files basic/example validation command is:

wasm-port/tests/native/verify_nc_files.sh

The current WASM smoke validation command is:

wasm-port/tests/wasm/node/verify_ini_wasm.sh

The current WASM interpreter-core smoke validation command is:

wasm-port/tests/wasm/node/verify_interp_wasm.sh

The current WASM sim-config smoke validation command is:

wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh

The current WASM nc_files smoke validation command is:

wasm-port/tests/wasm/node/verify_nc_files_wasm.sh

The current WASM trajectory-planner smoke validation command is:

wasm-port/tests/wasm/node/verify_tp_wasm.sh

The current OPFS host-boundary validation command is:

wasm-port/tests/opfs/node/verify_file_service.sh

The current browser smoke validation command is:

wasm-port/tests/browser/verify_ini_panel_browser.sh

The current browser interpreter smoke validation command is:

wasm-port/tests/browser/verify_interp_browser.sh

The current aggregate host/WASM/browser smoke command is:

wasm-port/tests/host/verify_host_smokes.sh

Validation Layers

Use these layers when deciding where a LinuxCNC asset belongs. Do not widen a later layer until the narrower layer has either passed or recorded an explicit expected boundary.

Layer	Scope	Entry command	Current result	Expected boundary
1	linuxcnc/nc_files basic G-code smoke	wasm-port/tests/native/verify_nc_files.sh	total: 107, pass: 101, expected_fail: 6, unexpected_fail: 0	LinuxCNC-native entry-point/context edges only: W-axis machine context, lathe tool/cutter-comp context, upstream O-word syntax edge, and probe runtime context.
2	linuxcnc/configs/sim native strict harness	wasm-port/tests/native/verify_sim_configs.sh	total: 159, pass: 151, expected_fail: 8, unexpected_fail: 0	Native bin/rs274 cannot provide task/user-M process execution or some INI axis-mask/runtime context. The upstream incremental_repetition_g533.ngc demo remains an expected upstream demo edge and must not be made pass by changing G-code semantics.
3	Standalone native runtime probes	wasm-port/tests/native/verify_native_probes.sh	Passes with native probes complete after source sync, no-standalone-semantics, fixture baseline, sim-config, and nc_files checks	Runtime adapters may cover filesystem, HAL/user-M, remap, parameter, tool, kinematics, TP, and WASM/browser boundary behavior, but CNC semantics must still come from vendored LinuxCNC source.
4	WASM Node/browser representative smoke	wasm-port/tests/host/verify_host_smokes.sh plus targeted Node/browser commands below	Current targeted checks pass with sim_configs_wasm_node_smoke=ok, nc_files_wasm_node_smoke=ok, browser_interp_smoke=ok, browser_ini_opfs_smoke=ok, and aggregate host_wasm_opfs_browser_smokes=ok	JS/browser code may stage files, apply executable bits, persist OPFS text, and forward paths to C ABI calls. It must not implement G-code, remap, tool-table, parameter, planner, kinematics, or user-M semantics.

Layer 4 is made of focused smoke commands so failures can be isolated before running the aggregate host check:

wasm-port/tests/wasm/node/verify_ini_wasm.sh
wasm-port/tests/wasm/node/verify_interp_wasm.sh
wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh
wasm-port/tests/wasm/node/verify_nc_files_wasm.sh
wasm-port/tests/wasm/node/verify_tp_wasm.sh
wasm-port/tests/opfs/node/verify_file_service.sh
wasm-port/tests/browser/verify_ini_panel_browser.sh
wasm-port/tests/browser/verify_interp_browser.sh
wasm-port/tests/host/verify_host_smokes.sh

Layer 4 INI-context staging uses planIniFileContextStaging() to collect INI-declared [DISPLAY]OPEN_FILE, [EMCIO]TOOL_TABLE, [RS274NGC]PARAMETER_FILE, [RS274NGC]SUBROUTINE_PATH, [RS274NGC]USER_M_PATH, and remap-NGC files from the vendored source manifest without browser directory enumeration. planSimConfigStaging() is the configs/sim wrapper around that generic planner. These planners are host filesystem helpers only; execution still goes through vendored LinuxCNC interpreter/remap/tool/parameter code.

Layer responsibilities are intentionally narrow:

Layer	LinuxCNC-owned behavior	Host/WASM adapter allowance	Expected-failure policy
1	nc_files parsing and execution through upstream rs274	Generate only the native harness INI/tool-table context needed to classify upstream examples	Expected failures document missing machine/task context or known upstream example edges; they must not be made pass by changing G-code semantics.
2	configs/sim file execution through upstream rs274 with sim INI context	Locate the corresponding INI/tool table and classify main programs, macros, and remap subroutines	Expected failures document upstream standalone rs274 limits such as task/user-M process edges and the preserved incremental_repetition_g533.ngc demo edge.
3	Vendored LinuxCNC interpreter, remap, tool, parameter, kinematics, and planner code	Provide deterministic runtime shims for filesystem, HAL/user-M boundaries, machine status, and build/source-probe coverage	A standalone pass may cover a runtime edge that Layer 1/2 cannot provide, but it must still call vendored LinuxCNC source for CNC behavior.
4	Vendored LinuxCNC C ABI behavior from generated WASM modules	Stage files, apply executable bits, persist OPFS text, generate manifest-based staging plans, and forward paths/results between JS/browser and C ABI	A WASM/browser pass proves the host boundary can reproduce the staged LinuxCNC context; it does not replace native source validation or justify JS-owned CNC semantics.

Layer 2 Expected Failures

The current wasm-port/tests/native/verify_sim_configs.sh run reports total: 159, pass: 151, expected_fail: 8, and unexpected_fail: 0. The eight expected failures are:

Program	Layer 2 classification	Current Layer 3/4 coverage or boundary
axis/foam/foam.ngc	ini-axis-mask-UV; native upstream bin/rs274 rejects U/V words before the standalone runtime applies the INI machine axis mask.	Covered by wasm-port/tests/native/verify_native_probes.sh, wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh, and wasm-port/tests/browser/verify_interp_browser.sh, which run the vendored file with axis_foam.ini and verify U/V axis acceptance through LinuxCNC-backed file execution.
axis/vismach/5axis/bridgemill/5axisgui.ngc	ini-axis-mask-W; native upstream bin/rs274 rejects the W word outside the bridge-mill runtime context.	Covered by wasm-port/tests/native/verify_native_probes.sh, wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh, and wasm-port/tests/browser/verify_interp_browser.sh, which stage 5axis.ini, the tool table, and remap subroutines, then execute through the vendored LinuxCNC remap/file path.
axis/geometry/xyzc.ngc	user-m-code-M110; native upstream bin/rs274 does not register or execute the sim-config USER_M_PATH handler.	Covered by wasm-port/tests/native/verify_native_probes.sh, wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh, and wasm-port/tests/browser/verify_interp_browser.sh; the smoke assertions require canon_event=USER_M_COMMAND code=M110 and reject Unknown m code used: M110.
axis/external_offsets/dyn_demo.ngc	user-m-code-M111; native upstream bin/rs274 does not register or execute the sim-config USER_M_PATH handler.	Covered by wasm-port/tests/native/verify_native_probes.sh, wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh, and wasm-port/tests/browser/verify_interp_browser.sh; the smoke assertions require canon_event=USER_M_COMMAND code=M111 and reject Unknown m code used: M111.
axis/external_offsets/eoffsets.ngc	user-m-code-M111; same standalone task/user-M boundary as dyn_demo.ngc.	Covered by wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh and wasm-port/tests/browser/verify_interp_browser.sh with the vendored executable M111 and eoffset.tbl staged from the manifest.
axis/external_offsets/jwp_z.ngc	user-m-code-M111; same standalone task/user-M boundary as dyn_demo.ngc.	Covered by wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh and wasm-port/tests/browser/verify_interp_browser.sh with the vendored executable M111 and eoffset.tbl staged from the manifest.
axis/external_offsets/opa_demo.ngc	user-m-code-M111; same standalone task/user-M boundary as dyn_demo.ngc, plus a subroutine dependency.	Covered by wasm-port/tests/wasm/node/verify_sim_configs_wasm.sh and wasm-port/tests/browser/verify_interp_browser.sh, which stage M111, eoffset.tbl, and the SUBROUTINE_PATH dependency circles.ngc.
axis/vismach/5axis/table-rotary_spindle-rotary-nutating/demos/incremental_repetition_g533.ngc	upstream-demo-missing-motion-gcode; upstream standalone rs274 reports Cannot use axis values without a g code that uses them.	Preserved as an upstream demo expected failure. Do not make this pass by editing the G-code, changing JS interpreter behavior, or adding standalone semantics.

Validation Chain

The native validation script runs these checks in order:

1. tools/verify_upstream_baseline.sh Confirms ../linuxcnc is at the recorded upstream commit in tools/upstream-baseline.txt.
2. tools/verify_vendor_sync.sh Confirms every manifest file is present in vendor/linuxcnc/, no extra vendored file exists, and every vendored file is byte-identical to upstream.
3. tools/verify_no_standalone_cnc_semantics.sh Confirms standalone code has not introduced project-owned Interp::... member definitions outside the documented Python/remap runtime-edge stubs.
4. tools/verify_native_linuxcnc_fixture_baseline.sh Runs a side-by-side fixture baseline through upstream ../linuxcnc/bin/rs274 and compares normalized canonical events for fixtures that do not require standalone-only runtime adapters.
5. tools/build_native_probes.sh Builds native source probes and standalone harnesses from vendored LinuxCNC source plus narrow runtime wrappers.
6. tests/native/verify_sim_configs.sh Runs LinuxCNC configs/sim .ngc programs through the upstream ../linuxcnc/bin/rs274 standalone entry point, using nearest or explicit sim INI/tool-table mappings and classifying main programs, macro-load checks, and remap subroutines separately.
7. tests/native/verify_nc_files.sh Runs the basic/example subset of upstream linuxcnc/nc_files through ../linuxcnc/bin/rs274, with complete programs executed strictly and macro/library files wrapped only for load/parse validation.
8. tests/native/verify_native_probes.sh Checks probe exit codes, source-probe coverage, harness stdout, canonical fixture events, and expected error behavior.

Current nc_files basic-suite baseline:

total: 107
pass: 101
fail: 6
timeout: 0
expected_fail: 6
unexpected_fail: 0

The six expected failures are LinuxCNC-native entry-point/context edges: cone.ngc needs a W-axis 5-axis machine context; g76.ngc and lathe-g76.ngc need lathe cutter-compensation/tool context; lathe_g70_71_demo.ngc needs lathe profile/tool context; nestedcall.ngc uses an upstream O-word callsub syntax edge; and tool-length-probe.ngc needs probe runtime context.

The same runner also supports exploratory full-directory inventory:

wasm-port/tests/native/verify_nc_files.sh --all

Current full-directory nc_files inventory:

total: 247
pass: 219
fail: 28
timeout: 0
expected_fail: 28
unexpected_fail: 0

The additional expected failures are probe/plasmac runtime-context files and one NURBS sample using G2.2, which the current upstream bin/rs274 standalone entry point reports as Unknown g code used.

The WASM INI smoke script builds runtime/ui/ini-panel/linuxcnc_ini.js and linuxcnc_ini.wasm from vendored LinuxCNC inifile.cc, then loads that module through runtime/sdk/src/index.js in Node and verifies INI string and boolean queries against a file written to the Emscripten filesystem. Boolean conversion is validated through vendored LinuxCNC iniFindBool(), and machine-session file-name lookup is validated through LinuxCNC string queries for [RS274NGC]PARAMETER_FILE and [EMCIO]TOOL_TABLE.

The WASM interpreter-core smoke script builds build/wasm/core/linuxcnc_interp.js and linuxcnc_interp.wasm from the same vendored LinuxCNC interpreter source set used by the native minimal interpreter harness. It loads the module in Node through runtime/sdk/src/index.js, runs the first WASM interpreter fixture group through Interp::execute(), and compares emitted canonical events plus required LinuxCNC _setup state readback with the matching files in tests/fixtures/canon/. It also calls vendored Interp::init() and Interp::synch() through the WASM C ABI to validate the initialization canonical boundary, metric/inch machine-unit status edge, and current/selected tool slot status synchronization already covered by the native init harness. It also calls the vendored single-axis rotary indexer path through Interp::execute() to validate the UNLOCK_ROTARY/LOCK_ROTARY canonical runtime boundary already covered by the native indexer harness. It also calls vendored Interp::init_named_parameters() and Interp::find_named_param() through the WASM C ABI to validate the native named-parameter harness path for LinuxCNC built-in, INI-backed, HAL-backed, and missing named-parameter lookup. It also writes selected G-code fixtures and vendored tests/interp/g10 regressions into the Emscripten filesystem through the SDK and runs them through LinuxCNC Interp::open(), Interp::read(), and Interp::execute() to validate the file execution path, including G10 tool-table updates, tool-length offset application timing, active G5X offset changes, G92 interaction, XY-rotation behavior, G52/G92 shared-offset transitions, and G92 startup parameter-file persistence through vendored ini_load()/Interp::init()/restore_parameters(), including DISABLE_G92_PERSISTENCE clearing parameters 5210-5219. It also writes the vendored LinuxCNC xyzac-trt and xyzbc-trt table-rotary-tilting sample machine INI, remap_subs/*.ngc, and xyzac_switchkins.ngc/xyzbc_switchkins.ngc, xyzac_switchkins_test_1.ngc, xyzac_switchkins_test_2.ngc, xyzac_switchkins_test_3.ngc, boat-xyzac.ngc, boat-xyzbc.ngc, and impeller-7bl-xyzac.ngc demo files into the Emscripten filesystem. It also writes the vendored LinuxCNC xyzab-tdr table-dual-rotary INI, tool table, remap_subs/*.ngc, and xyzab-tdr-demo.ngc into the Emscripten filesystem. It also writes the vendored LinuxCNC bridge-mill 5axis.ini, tool table, remap_subs/*.ngc, and 5axisgui.ngc into the Emscripten filesystem. These checks validate the WASM C ABI/SDK path for vendored LinuxCNC REMAP parsing, vendored LinuxCNC tool-table loading from the machine INI, O-word remap execution, M68/M66 HAL synchronization, and file open()/read()/execute() completion without JavaScript M-code or kinematics semantics. The same Node smoke writes the vendored LinuxCNC tests/remap/duplicate-o-word, NGC-only tests/remap/fail/args.0, tests/remap/fail/args.1, tests/remap/fail/args.2, tests/remap/fail/body-ngc, tests/remap/m30-interaction, tests/remap/nested-remaps-oword, tests/remap/posargs.0, and tests/remap/sequencing INI, program, and remap subroutines into the Emscripten filesystem and validates those upstream NGC remap regressions through the generic runRemapFile() C ABI/SDK path, which only reads LinuxCNC INI SUBROUTINE_PATH, REMAP, and OWORD_NARGS entries and calls vendored Interp::parse_remap(), open(), read(), and execute(). The NGC-only failure cases that match upstream rs274 -n 0 flow use the sibling runRemapFileContinueOnError() C ABI/SDK path, which records LinuxCNC error text and continues the same vendored open()/read()/execute() loop without implementing failure semantics in JavaScript. The same Node smoke also writes the NGC-only LinuxCNC tests/remap/remap-io/test-ngc.ini and io_*.ngc subroutines into the Emscripten filesystem, then calls runRemapIoMdiSequence() to feed the upstream test-driver MDI sequence into vendored Interp::execute(). The SDK does not implement M62-M68, M66 input, or REMAP semantics; the standalone boundary only pre-seeds deterministic external input values and captures LinuxCNC canonical events. The same WASM interpreter smoke also writes minimal M110 and M111 fixtures into the Emscripten filesystem, marks the M1xx files executable, and validates that the standalone machine-config boundary mirrors LinuxCNC task-layer [DISPLAY]PROGRAM_PREFIX plus [RS274NGC]USER_M_PATH lookup by registering USER_DEFINED_FUNCTION entries and recording deterministic USER_M_COMMAND events instead of spawning host processes. The same Node smoke writes the vendored LinuxCNC tests/interp/do-while-break, tests/interp/oword-bug315, tests/interp/oword-bug315-p2, tests/interp/exists, tests/interp/return-value, tests/interp/subs-follow-main, tests/interp/fractional-linenumbers, tests/interp/cam-nisley with its upstream test.tbl, tests/interp/namedparam-bug424, selected tests/interp/rotation pure interpreter cases, tests/interp/iniparam, tests/interp/iniparam-failassign, tests/interp/sub-call-from-sub, tests/interp/sequence-number, and tests/interp/nested-sub-error, tests/interp/nested-sub-in-file-error, and tests/interp/abort-hot-comment files into the Emscripten filesystem and validates those upstream interpreter regressions through runFile() or runFileWithIni(), which only reads LinuxCNC INI SUBROUTINE_PATH where needed and calls vendored LinuxCNC Interp::open(), read(), and execute(). The iniparam fixtures validate vendored LinuxCNC _ini[...] lookup, missing INI-parameter error text, and read-only named-parameter assignment rejection through the INI_FILE_NAME runtime edge. It checks LinuxCNC canonical messages, canonical motion/events, and final interpreter state without JavaScript O-word, subroutine lookup, INI-variable, or read-only-parameter semantics. The same Node smoke writes LinuxCNC-format parameter files into the Emscripten filesystem and validates vendored Interp::restore_parameters() and Interp::save_parameters(), including the saved parameter values, missing required numeric parameter defaulting, and the .bak backup file boundary. It also writes the negative G-code fixtures into the Emscripten filesystem and verifies their LinuxCNC-produced error text through the Interp::open()/read()/execute() file path.

The WASM trajectory-planner smoke script builds build/wasm/tp/linuxcnc_tp.js and linuxcnc_tp.wasm from vendored LinuxCNC TP, TC, TC queue, spherical-arc, blendmath, S-curve, Ruckig-wrapper, C Ruckig support, emcpose, and posemath source files. It loads the module in Node and calls the exported TP probe C ABI to validate the same LinuxCNC linear, arc, and queued-line planner calls covered by the native linuxcnc_tp_api_probe.

The OPFS host-boundary script validates the JavaScript file-service adapter with a Node mock of the browser File System Access handles. It covers nested directory creation, text save/load, missing file behavior, invalid relative paths, unavailable OPFS storage, and the host-side OPFS path model for INI, tool table, parameter, G-code, preview-cache, and session-snapshot storage targets. It also validates the host-side session snapshot JSON envelope and round-trip store, including unsupported format/version, session-id mismatch, non-object metadata/payload rejection, custom snapshot filenames, and invalid snapshot filename rejection, plus pure-text machine file and G-code stores, including G-code program filename rejection for traversal or nested paths, without defining CNC machine-state or file-format semantics. It now also validates the OPFS-to-WASM parameter-file bridge with a mock interpreter SDK to ensure the host boundary copies text into and out of the WASM filesystem without defining parameter semantics, and that INI-derived machine file names are still rejected by the OPFS path model when they contain traversal or nested path segments. The same Node smoke also validates that explicit session file-name options take precedence over INI-derived parameter and tool-table file names, and that missing INI file-name values fall back to the host path model defaults, keeping host override policy outside CNC semantics.

The browser INI/OPFS smoke script serves wasm-port/ over localhost and runs Chromium headless against a test page that imports the JS SDK, loads the INI WASM module, queries vendored LinuxCNC INI parsing through the SDK, including machine-session parameter/tool-table file-name strings, and performs an OPFS text-file, generic session snapshot, custom snapshot filename, invalid snapshot filename/envelope, machine file, G-code text round trip, and G-code filename path-model rejection. It also verifies that the INI panel UI exposes LinuxCNC-backed [RS274NGC]PARAMETER_FILE and [EMCIO]TOOL_TABLE query results, plus the default OPFS parameter-file and tool-table mappings used when a machine session is copied into the interpreter WASM filesystem. It also clicks the INI panel's 5-axis remap demo action and verifies that the UI copies vendored LinuxCNC xyzac-trt machine/remap/demo files into the interpreter WASM filesystem, calls the LinuxCNC-backed SDK remap execution path for the vendored impeller-7bl-xyzac.ngc demo, and displays the resulting fiveaxis_* status lines without JavaScript M-code or kinematics semantics.

The browser interpreter smoke script serves wasm-port/ over localhost and runs Chromium headless against a test page that loads the interpreter-core WASM module through runtime/sdk/src/index.js, writes no CNC behavior in JavaScript, and verifies existing canonical fixtures through the exported C ABI backed by vendored LinuxCNC Interp::execute() and Interp::open()/read()/execute() paths, including the INI-aware named-parameter file path and negative interpreter fixtures with expected error text plus absent canonical motion output. It also validates vendored Interp::init() and Interp::synch() through the same SDK/C ABI path, including initialization canonical events, metric/inch machine units, and tool slot readback, and checks the vendored rotary-indexer G0 A... execution path for UNLOCK_ROTARY/LOCK_ROTARY boundary events. It also validates Interp::init_named_parameters() and Interp::find_named_param() through the same browser SDK/C ABI path for built-in, INI-backed, HAL-backed, and missing named-parameter lookup. It also directly checks browser SDK parameter-file restore/save through vendored Interp::restore_parameters() and Interp::save_parameters(), including the LinuxCNC-saved text and .bak backup, and directly checks browser SDK non-random/random tool-table load/save through vendored tooldata_common.cc. The same browser smoke uses real browser OPFS storage plus the interpreter SDK to restore/save LinuxCNC parameter files, directly checks missing-file success plus out-of-order parameter-file rejection through the same LinuxCNC restore_parameters() C ABI, and checks the random-toolchanger tooldata_save() result before OPFS text writeback, to reject invalid INI-derived parameter/tool-table file names through the OPFS path model after the names are parsed by the LinuxCNC-backed INI WASM SDK. It also verifies that explicit session parameter/tool-table file-name options override INI-derived names before OPFS text is copied into the LinuxCNC-backed WASM filesystem, and that absent INI file-name values use the default OPFS parameter/tool-table paths in a real browser session. It also writes vendored LinuxCNC xyzac-trt/xyzbc-trt INI, remap subroutines, and switchkins demo files, including xyzac_switchkins_test_1.ngc, xyzac_switchkins_test_2.ngc, xyzac_switchkins_test_3.ngc, and the larger boat-xyzac.ngc, boat-xyzbc.ngc, and impeller-7bl-xyzac.ngc demos, into the browser WASM filesystem. It also writes vendored LinuxCNC xyzab-tdr machine files and xyzab-tdr-demo.ngc into the browser WASM filesystem. It also writes vendored LinuxCNC bridge-mill machine files and 5axisgui.ngc into the browser WASM filesystem. The browser smoke verifies runFiveAxisRemapFile() for the table-rotary-tilting, table-dual-rotary, and bridge-mill sample machines through the exported LinuxCNC remap/tool-table/file execution path. It also verifies the vendored LinuxCNC configs/sim/axis/foam/foam.ngc, axis/geometry/xyzc.ngc, and axis/external_offsets/dyn_demo.ngc programs through runSimConfigProgram(), which writes the browser WASM filesystem files and forwards to runFileWithIni(). It also verifies the bridge-mill axis/vismach/5axis/bridgemill/5axisgui.ngc program through runSimConfigProgram() with executionMode: "fiveAxisRemap", which forwards to runFiveAxisRemapFile(). These paths use the real vendored executable M110 and M111 files for USER_M_PATH registration without spawning host processes. It also verifies the vendored LinuxCNC tests/remap/duplicate-o-word, NGC-only tests/remap/fail/args.0, tests/remap/fail/args.1, tests/remap/fail/args.2, tests/remap/fail/body-ngc, tests/remap/m30-interaction, tests/remap/nested-remaps-oword, tests/remap/posargs.0, and tests/remap/sequencing regressions through runRemapFile() or runRemapFileContinueOnError(), using the browser WASM filesystem and vendored LinuxCNC REMAP/O-word/file execution path without JavaScript remap semantics. It also writes the NGC-only vendored LinuxCNC tests/remap/remap-io/test-ngc.ini and io_*.ngc subroutines into the browser WASM filesystem and validates runRemapIoMdiSequence() through vendored LinuxCNC REMAP parsing and MDI execution without JavaScript M-code or I/O semantics. It also writes vendored LinuxCNC tests/interp/do-while-break, tests/interp/oword-bug315, tests/interp/oword-bug315-p2, tests/interp/exists, tests/interp/return-value, tests/interp/subs-follow-main, tests/interp/fractional-linenumbers, tests/interp/cam-nisley, tests/interp/namedparam-bug424, tests/interp/inside-corners, tests/interp/inverse-time-with-comp, and selected tests/interp/rotation .ngc files plus tests/interp/sub-call-from-sub test.ini, test.ngc, and subs/*.ngc files and tests/interp/sequence-number test.ini, test.ngc, and rm400.ngc plus tests/interp/nested-sub-error test.ini, test.ngc, and subs/nested.ngc and tests/interp/nested-sub-in-file-error test.ini, test.ngc, and subs/sequential.ngc, plus tests/interp/abort-hot-comment test.ini and test.ngc, plus tests/interp/m19 test.ini and test.ngc, plus tests/interp/magic_comments/param_format_printing test.ngc, plus selected pure-interpreter tests/interp/m98m99 cases covering Fanuc-style M98/M99, missing-P-word, missing-subprogram, mixed Fanuc/RS274NGC sub-style, and DISABLE_FANUC_STYLE_SUB INI-gated errors, main-program O-word termination rules, parameter scope, loop counts including L0, nested numbered subprograms, subprograms after main program text, leading-zero O-word lookup, named and numbered main programs, and expression-based O-sub/M98 calls, into the browser WASM filesystem and validates those upstream interpreter regressions through runFile() or runFileWithIni(), without JavaScript O-word, parameter, line-number, spindle-speed, spindle-orient, magic-comment formatting, M98/M99, subroutine lookup, or branch semantics.

The aggregate host smoke script builds the INI, interpreter-core, and trajectory-planner WASM artifacts once, then runs the Node WASM smokes, the Node OPFS mock smoke, and the Chromium browser smokes.

Source Coverage

Every .c and .cc entry in tools/source-manifest.txt must have a corresponding *_source_probe entry in build/native/source-probes.tsv. The validation fails if:

• a manifest source file lacks a source probe;
• a source probe references a file not listed in the manifest;
• a manifest file is duplicated;
• vendored files drift byte-for-byte from upstream LinuxCNC.

Current Native Harnesses

Harness	Purpose
linuxcnc_ini_probe	Validates vendored LinuxCNC INI parsing can be used standalone.
linuxcnc_interp_state_probe	Validates interpreter state constants and structs compile under the standalone boundary.
linuxcnc_rs274_compile_probe	Validates the upstream tests/interp/compile class remains a source/compile boundary rather than being misclassified as a runtime .ngc interpreter fixture.
linuxcnc_emc_status_probe	Validates the standalone emcStatus machine-units status boundary used by vendored interpreter conversion and initialization code.
linuxcnc_namedparam_harness	Validates LinuxCNC named parameter behavior, _ini[...], and _hal[...] adapter resolution.
linuxcnc_interp_minimal_harness	Runs G-code fixtures through vendored LinuxCNC parser/execution/conversion code, captures canonical events, and validates feed-rate state readback across length-unit changes.
linuxcnc_parameter_file_harness	Validates LinuxCNC parameter file restore/save behavior and required/read-only parameter handling.
linuxcnc_interp_init_harness	Validates vendored LinuxCNC Interp::init() emits canonical initialization boundaries, reads metric/inch machine units, and synchronizes current/selected tool slots through standalone status adapters.
linuxcnc_indexer_harness	Validates vendored LinuxCNC single-axis rotary indexer dispatch emits lock/unlock and motion boundaries through the standalone event sink.
linuxcnc_remap_hal_sync_harness	Validates vendored LinuxCNC M68/M66 execution can drive the standalone HAL adapter boundary used by 5-axis switchkins remap files, including _hal[motion.switchkins-type] readback.
linuxcnc_5axis_remap_execute_harness	Validates vendored LinuxCNC REMAP parsing plus NGC remap execution for the 5-axis M429 -> M428 -> M430 -> M429 switchkins path in the xyzac-trt and xyzbc-trt sample machines, the two-remap M429 -> M428 -> M429 path in the xyzab-tdr sample machine, and the bridge-mill M429 -> M428 -> M430 -> M429 path where M428 selects the default bridge-mill kinematics. It loads vendored machine tool tables through LinuxCNC tooldata_load(), then runs vendored xyzac_switchkins.ngc, xyzbc_switchkins.ngc, xyzac_switchkins_test_1.ngc, xyzac_switchkins_test_2.ngc, xyzac_switchkins_test_3.ngc, boat-xyzac.ngc, boat-xyzbc.ngc, impeller-7bl-xyzac.ngc, xyzab-tdr-demo.ngc, and 5axisgui.ngc through the LinuxCNC file open/read/execute path.
linuxcnc_duplicate_oword_remap_harness	Validates vendored LinuxCNC upstream tests/remap/duplicate-o-word, NGC-only tests/remap/fail/args.0, tests/remap/fail/args.1, tests/remap/fail/args.2, tests/remap/fail/body-ngc, tests/remap/m30-interaction, tests/remap/nested-remaps-oword, tests/remap/posargs.0, tests/remap/sequencing, and the NGC-only tests/remap/remap-io/test-ngc.ini branch through LinuxCNC REMAP parsing, O-word remap dispatch, OWORD_NARGS, error-text reporting, G/M remap sequencing, remapped M62-M68/M66 MDI execution, and file open/read/execute. The standalone harness only supplies INI/file path setup, deterministic external input values, and canonical-event capture; it can continue after LinuxCNC errors for upstream rs274 -n 0 style tests and does not implement duplicate-label, O-word, M30, positional-argument, failure, sequencing, M62-M68, M66 input, or remap semantics.
linuxcnc_tp_api_probe	Validates vendored LinuxCNC trajectory planner calls for linear, arc, and queued motion paths.
linuxcnc_kinematics_probe	Validates vendored LinuxCNC trivkins.c plus kins_util.c initialize and perform identity forward/inverse mapping through the standalone HAL/RTAPI boundary.
linuxcnc_5axis_kinematics_probe	Validates vendored LinuxCNC 5axiskins.c through switchkins.c, including 5-axis forward/inverse round-trip behavior and switching to identity kinematics.
linuxcnc_xyzac_trt_kinematics_probe	Validates vendored LinuxCNC XYZAC TRT kinematics through switchkins.c, including forward/inverse round-trip behavior and switching to identity kinematics.
linuxcnc_xyzbc_trt_kinematics_probe	Validates vendored LinuxCNC XYZBC TRT kinematics through switchkins.c, including forward/inverse round-trip behavior and switching to identity kinematics.
linuxcnc_corexy_kinematics_probe	Validates vendored LinuxCNC CoreXY forward/inverse behavior through the standalone HAL/RTAPI boundary.
linuxcnc_rotate_kinematics_probe	Validates vendored LinuxCNC rotated-axis forward/inverse behavior.
linuxcnc_rose_kinematics_probe	Validates vendored LinuxCNC rose kinematics forward/inverse behavior.
linuxcnc_max_kinematics_probe	Validates vendored LinuxCNC max kinematics forward/inverse behavior.
linuxcnc_lineardelta_kinematics_probe	Validates vendored LinuxCNC linear-delta inverse/forward pose round-trip behavior.
linuxcnc_rotarydelta_kinematics_probe	Validates vendored LinuxCNC rotary-delta inverse/forward pose round-trip behavior.
linuxcnc_scorbot_kinematics_probe	Validates vendored LinuxCNC Scorbot forward/inverse behavior and pose round-trip behavior.
linuxcnc_tripod_kinematics_probe	Validates vendored LinuxCNC tripod inverse/forward behavior, including below-platform flag behavior.
linuxcnc_scara_kinematics_probe	Validates vendored LinuxCNC SCARA forward/inverse behavior and switching to identity kinematics.
linuxcnc_puma_kinematics_probe	Validates vendored LinuxCNC PUMA forward/inverse behavior, pose round-trip behavior, and switching to identity kinematics.
linuxcnc_genser_kinematics_probe	Validates vendored LinuxCNC generic serial kinematics forward/inverse behavior and switching to identity kinematics.
linuxcnc_genhex_kinematics_probe	Validates vendored LinuxCNC generic hexapod inverse/forward behavior, including the switchkins iterative-forward warmup path.
linuxcnc_pentakins_kinematics_probe	Validates vendored LinuxCNC pentapod inverse/forward pose round-trip behavior.

Current WASM Harnesses

Harness	Purpose
tests/wasm/node/verify_ini_wasm.sh	Validates the browser-facing INI WASM module can be built from vendored LinuxCNC inifile.cc, loaded through the JS SDK in Node, and queried through the exported C ABI, including LinuxCNC-backed boolean conversion and machine-session file-name string lookup.
tests/wasm/node/verify_interp_wasm.sh	Validates the interpreter-core WASM module can be built from vendored LinuxCNC interpreter/remap source, loaded through the interpreter JS SDK, run the first fixture group through Interp::execute() and selected file fixtures plus vendored upstream tests/interp regression files through Interp::open()/read()/execute(), match the native canonical event plus required state readback fixtures, emit run_step execution-status records with LinuxCNC line number, encoded source statement, return code, and interpreter axis positions for file execution, cover vendored tests/interp/flowsnake recursive O-word file execution, tests/interp/g6164 path-control and naive-cam tolerance execution, tests/interp/oword-unwind continue-on-error stack unwind behavior through planner-staged INI context, selected tests/interp/bad file-error paths, and tests/interp/g33.1 rigid-tap file execution, run vendored xyzac-trt/xyzbc-trt switchkins remap demo files through the WASM C ABI/SDK path, and run parameter-file restore/save through vendored LinuxCNC Interp::restore_parameters() and Interp::save_parameters().
tests/wasm/node/verify_sim_configs_wasm.sh	Validates representative vendored LinuxCNC configs/sim programs in Node WASM through planSimConfigStaging() plus runSimConfigProgram(). The generic planIniFileContextStaging() planner and its sim-config wrapper use INI text and tools/source-manifest.txt to collect the program, INI, tool table, parameter file when vendored, SUBROUTINE_PATH files, USER_M_PATH files, and remap-NGC files before forwarding to runFileWithIni() or runFiveAxisRemapFile(). This covers INI-driven U/V/W axis mask handling, real USER_M_PATH registration for executable M110/M111, all four current external-offset M111 expected-failure programs, SUBROUTINE_PATH staging for opa_demo.ngc -> circles.ngc, bridge-mill remap-subroutine staging, and vendored LinuxCNC bridge-mill NGC remap execution without spawning host processes. The same smoke includes synthetic staging-plan assertions for generic TOOL_TABLE, PARAMETER_FILE, multi-directory SUBROUTINE_PATH, USER_M_PATH, and REMAP ... ngc=... file collection.
tests/wasm/node/verify_nc_files_wasm.sh	Validates representative vendored LinuxCNC nc_files examples in Node WASM by copying 3D_Chips.ngc, arcspiral.ngc, hole-circle.ngc, factorial.ngc, and m6demo.ngc into the Emscripten filesystem and forwarding to the LinuxCNC-backed Interp::open()/read()/execute() path. 3D_Chips.ngc is staged with a minimal INI-declared tool.tbl because the upstream program contains T1 M6; JavaScript only stages files and checks LinuxCNC output, including run_step status records, and does not implement G-code, O-word, tool-change, or M-code behavior.
tests/wasm/node/verify_tp_wasm.sh	Validates a standalone trajectory-planner WASM module can be built from vendored LinuxCNC TP/TC/Ruckig support source, loaded in Node, and run the same linear, arc, and queued-line planner probe paths covered by the native TP harness.
tests/opfs/node/verify_file_service.sh	Validates the host-owned OPFS text-file adapter, path model, session snapshot store including custom filenames and envelope/path rejection paths, machine file store, G-code text store including filename rejection paths, OPFS-to-WASM parameter/tool-table bridges, and grouped machine-session loading without moving file persistence, parameter semantics, or tool-table semantics into the WASM core.
tests/browser/verify_ini_panel_browser.sh	Validates the INI SDK, INI/interpreter WASM module loading, LinuxCNC-backed INI machine-session file-name string lookup, OPFS text-file round trip, generic session snapshot round trip plus custom filename and envelope/path rejection paths, machine file text round trip, G-code text round trip plus filename rejection paths, and the INI panel UI's machine-session load with default OPFS parameter/tool-table file mapping, G-code run, run_step-backed progress/line/statement/axis display, canonical-event display paths, and 5-axis remap demo action in a real browser runtime.
tests/browser/verify_interp_browser.sh	Validates the interpreter-core WASM module loads through the interpreter JS SDK in a real browser runtime and runs selected positive and negative canonical fixtures plus vendored upstream tests/interp regression files through vendored LinuxCNC Interp::execute() and Interp::open()/read()/execute() via the exported C ABI, including direct browser SDK and OPFS-backed parameter-file restore/save, non-random/random tool-table load/save through vendored LinuxCNC source, vendored xyzac-trt/xyzbc-trt switchkins remap demo execution, representative vendored configs/sim foam, geometry, external_offsets, and bridge-mill programs through runSimConfigProgram(), representative vendored nc_files examples through runFile() or runFileWithIni() when the upstream file requires INI/tool-table context, and a synthetic browser assertion that planIniFileContextStaging() can collect INI, program, tool-table, parameter, multi-directory subroutine, executable user-M, and remap-NGC files using only manifest text.
tests/host/verify_host_smokes.sh	Runs the current host-side Node, WASM interpreter-core, WASM trajectory-planner, OPFS, and browser smoke validation with shared WASM builds.

Fixture Coverage

Positive G-code fixtures currently cover:

• linear traverse/feed
• arc semantics
• modal absolute/incremental motion
• position parameters
• canned cycles
• coordinate offsets
• G53 machine-coordinate motion
• feed and motion control modes
• probing
• threading and rigid tap
• NURBS G5/G6
• spindle orient
• tool semantics
• tool table setup
• tool-data reload boundary
• interpreter state-tag boundary
• percent-delimited file FINISH boundary
• file-open ON_RESET boundary
• comment logging canonical calls
• local, INI-backed named parameters and numbered parameters
• O-word subroutines
• continue-on-error O-word unwind
• program-end modal reset
• canonical runtime edge calls

Negative fixtures currently cover:

• zero-feed G1
• arc radius mismatch
• zero-radius arc
• G53 incremental-mode rejection
• read-only named parameter writes
• read-only numbered parameter writes
• missing tool
• missing tool length offset

The negative fixture expectations are also checked against upstream rs274 -g: the baseline requires LinuxCNC to reject each program, to emit the expected error text, and to omit the canonical event lines marked as absent in tests/fixtures/canon_errors/.

Validation Boundaries

Current full-core validation is native-only. WASM/SDK validation covers the INI parser smoke harness and an initial interpreter-core canonical event smoke for minimal_linear, arc_semantics, length_units, modal_incremental, plane_selection, coordinate_offsets, g53_machine_coordinates, feed_control_modes, position_params, probe_semantics, spindle_orient, comment_logging, numbered_params, tool_semantics, tool_table_setup, tool_reload, canned_cycles, cutter_comp_motion, threading_sync, nurbs_g5_semantics, nurbs_g6_semantics, state_tag_motion, canon_runtime_edges, program_end_modal_reset, namedparam_ini_semantics, and namedparam_semantics through both Node WASM and browser INI-aware program ABI smoke coverage, plus the g1_zero_feed, arc_radius_mismatch, arc_zero_radius, cutter_comp_plane_change, g53_incremental, namedparam_readonly, numbered_param_readonly, tool_not_found, and tool_length_offset_not_found negative fixtures. The WASM interpreter file path additionally covers the same canonical-event fixture group, plus namedparam_ini_semantics and namedparam_semantics through the INI-aware file execution ABI, file_open_reset, percent_file_finish, oword_subroutine, g6164, and oword_unwind. position_params uses a dedicated file-path expectation under tests/fixtures/canon_file/ because LinuxCNC file execution advances the post-execute position parameters differently than the line-by-line MDI smoke; both expectations now also pin post-execute modal, override, spindle, mist, and flood _setup state readback. coordinate_offsets also uses a dedicated file-path expectation because LinuxCNC file execution leaves the post-execute position parameters at the file-path reset state while the line-by-line MDI path exposes the active G55 offset values; both paths pin the post-execute modal, override, spindle, mist, and flood _setup state. tool_semantics also pins the post-execute position-parameter and modal, override, spindle, mist, and flood _setup state after T/M6/G43/G49/M61 tool behavior. feed_control_modes pins the post-execute feed and motion-control modal state plus the same position-parameter, override, spindle, mist, and flood _setup state readback after G93/G94/G95 and G61/G61.1/G64 transitions. The same Node WASM and browser file-path smokes also cover the negative fixture group and check the LinuxCNC file-execution error text plus absent canonical motion constraints where applicable. canon_runtime_edges also pins the vendored interpreter's post-program modal, override, spindle, mist, and flood _setup state readback after the canonical runtime-edge calls complete. The Node WASM and browser interpreter smokes also cover LinuxCNC parameter-file restore/save behavior through the exported C ABI, including out-of-order file rejection, missing-file success, missing required numeric parameter defaulting, required numeric parameter writeback, removal of named-parameter-only lines from saved output, and the .bak backup produced by vendored save_parameters(), including direct browser SDK readback from the Emscripten filesystem, browser OPFS readback of the backup text after the host bridge writes it to persistent storage, plus INI-derived custom and explicit host override parameter-file paths saved back to OPFS with their LinuxCNC-produced backup text. It also covers LinuxCNC tool-table load/save behavior through vendored tooldata_common.cc, including the non-random and random-toolchanger tooldata_init() branches, with the SDK only copying text into the Emscripten filesystem and calling the exported C ABI; the browser smoke directly reads back both non-random and random saved tool-table text from the Emscripten filesystem, checks the random-toolchanger tooldata_save() C ABI result before OPFS persistence writes the saved table text back, and verifies that INI-derived custom and explicit host override tool-table OPFS paths can be saved and read back after the table is loaded through vendored LinuxCNC. The same Node WASM and browser interpreter smokes now validate the exported Interp::init()/Interp::synch() probe for initialization canonical events, metric/inch emcStatus machine-unit conversion, and current/selected tool slot synchronization. They also validate the exported rotary-indexer probe for vendored LinuxCNC UNLOCK_ROTARY/LOCK_ROTARY dispatch around a single-axis G0 A... move, plus the exported named-parameter probe for direct LinuxCNC init_named_parameters() and find_named_param() lookup of built-in, INI-backed, HAL-backed, and missing named parameters. OPFS validation covers the JavaScript host-boundary adapter, the INI browser smoke harness, the INI panel UI's machine-session load and G-code run buttons, the raw canonical-event display fed directly by LinuxCNC interpreter WASM output, the Node parameter/tool-table bridges that copy OPFS text through the SDK into vendored LinuxCNC file APIs, the Node machine-session bridge that groups INI, parameter, and tool-table loading, the random-toolchanger flag derived from vendored LinuxCNC INI boolean parsing, INI-derived [RS274NGC]PARAMETER_FILE and [EMCIO]TOOL_TABLE file names mapped to OPFS machine files, OPFS path-model rejection of invalid INI-derived file names, explicit host session file-name overrides taking precedence over INI-derived names, default host path fallback when INI file-name values are absent, session snapshot custom filename handling plus envelope/path rejection for unsupported format/version, wrong session id, and invalid snapshot filenames, and a browser interpreter smoke that uses the same session bridge with real LinuxCNC INI WASM parsing before saving OPFS-backed parameter and tool-table text through vendored LinuxCNC file APIs, including default OPFS path fallback when INI file-name values are absent. Full browser coverage, full SDK coverage, and richer machine-state validation remain future work.

WASM/Browser Fixture Matrix

The executable fixture lists for Node WASM and browser interpreter smoke tests are centralized in tests/fixtures/interp-fixture-matrix.mjs. Additions to the matrix must continue to route execution through the SDK and exported C ABI backed by vendored LinuxCNC interpreter code; the matrix is only a test coverage list, not a CNC behavior implementation.

Node WASM Interp::execute() coverage currently includes:

• minimal_linear
• arc_semantics
• length_units
• modal_incremental
• plane_selection
• coordinate_offsets
• g53_machine_coordinates
• feed_control_modes
• position_params
• probe_semantics
• spindle_orient
• comment_logging
• numbered_params
• tool_semantics
• tool_table_setup
• tool_reload
• canned_cycles
• cutter_comp_motion
• threading_sync
• nurbs_g5_semantics
• nurbs_g6_semantics
• state_tag_motion
• canon_runtime_edges
• program_end_modal_reset
• namedparam_ini_semantics through the INI-aware program ABI
• namedparam_semantics through the INI-aware program ABI

Node WASM file-path coverage currently includes:

• minimal_linear
• arc_semantics
• length_units
• modal_incremental
• plane_selection
• g53_machine_coordinates
• feed_control_modes
• probe_semantics
• spindle_orient
• comment_logging
• numbered_params
• tool_semantics
• tool_table_setup
• tool_reload
• canned_cycles
• cutter_comp_motion
• threading_sync
• nurbs_g5_semantics
• nurbs_g6_semantics
• state_tag_motion
• canon_runtime_edges
• program_end_modal_reset
• file_open_reset
• percent_file_finish
• oword_subroutine
• coordinate_offsets through the dedicated canon_file/ expectation
• position_params through the dedicated canon_file/ expectation
• namedparam_ini_semantics through the INI-aware file ABI
• namedparam_semantics through the INI-aware file ABI

Node WASM file-path negative coverage currently includes every fixture under tests/fixtures/gcode_errors/:

• g1_zero_feed
• arc_radius_mismatch
• arc_zero_radius
• cutter_comp_plane_change
• g53_incremental
• namedparam_readonly
• numbered_param_readonly
• tool_length_offset_not_found
• tool_not_found

Browser interpreter file-path negative coverage currently includes the same negative fixture list through Interp::open()/read()/execute():

• g1_zero_feed
• arc_radius_mismatch
• arc_zero_radius
• cutter_comp_plane_change
• g53_incremental
• namedparam_readonly
• numbered_param_readonly
• tool_length_offset_not_found
• tool_not_found

Browser interpreter Interp::execute() coverage currently includes:

• minimal_linear
• arc_semantics
• length_units
• modal_incremental
• plane_selection
• coordinate_offsets
• g53_machine_coordinates
• feed_control_modes
• position_params
• canned_cycles
• numbered_params
• comment_logging
• tool_semantics
• tool_table_setup
• probe_semantics
• spindle_orient
• cutter_comp_motion
• threading_sync
• nurbs_g5_semantics
• nurbs_g6_semantics
• state_tag_motion
• canon_runtime_edges
• tool_reload
• program_end_modal_reset
• namedparam_ini_semantics through the INI-aware program ABI
• namedparam_semantics through the INI-aware program ABI

Browser interpreter negative coverage currently includes every fixture under tests/fixtures/gcode_errors/:

• g1_zero_feed
• arc_radius_mismatch
• arc_zero_radius
• g53_incremental
• cutter_comp_plane_change
• namedparam_readonly
• numbered_param_readonly
• tool_length_offset_not_found
• tool_not_found

Browser interpreter file-path coverage currently includes the same INTERP_FILE_FIXTURES list as the Node WASM smoke:

• minimal_linear
• arc_semantics
• length_units
• modal_incremental
• plane_selection
• g53_machine_coordinates
• feed_control_modes
• probe_semantics
• spindle_orient
• comment_logging
• numbered_params
• tool_semantics
• tool_table_setup
• tool_reload
• canned_cycles
• cutter_comp_motion
• threading_sync
• nurbs_g5_semantics
• nurbs_g6_semantics
• state_tag_motion
• canon_runtime_edges
• program_end_modal_reset
• file_open_reset
• percent_file_finish
• oword_subroutine
• coordinate_offsets through the dedicated canon_file/ expectation
• position_params through the dedicated canon_file/ expectation
• namedparam_ini_semantics through the INI-aware file ABI
• namedparam_semantics through the INI-aware file ABI

All current positive G-code fixtures have browser interpreter smoke coverage through either Interp::execute(), the file-path ABI, or the INI-aware file-path ABI.

The current fixture expectations validate standalone behavior against both the vendored LinuxCNC source path and an upstream rs274 side-by-side baseline for parser/conversion, arc geometry, offsets, feed-control and feed-state readback, comment/logging, numbered-parameter, local named-parameter plus _ini[...] lookup through rs274 -i, probing, spindle-orient, file-open reset, file-finish, tool-reload, tool select/change/length-offset, M61 current-tool-number update, canned-cycle, state-tag motion, tool-table setup, and O-word subroutine fixtures, plus vendored tests/interp/flowsnake recursive O-word toolpath, tests/interp/cam-nisley storm-door latch cam execution with upstream tool-table context and a bare-run missing-tool negative check, tests/interp/inside-corners cutter-compensation concave/convex/tangent geometry across XY and ZX planes, tests/interp/inverse-time-with-comp inverse-time feed and cutter-compensation interaction, selected upstream tests/interp/bad file-error paths including canned-cycle A-axis rejection, center-format arc radius mismatch rejection, and selected upstream tests/interp/good center-format arc tolerance acceptance, selected tests/interp/g72-* lathe facing canned-cycle iteration regressions, selected tests/interp/g71-* lathe roughing/finish canned-cycle regressions, tests/interp/g76 lathe threading with upstream tool-table context, cutter-compensation rejection, selected standalone tests/ccomp cutter-compensation file execution with upstream tool tables, threading/rigid tap, vendored tests/interp/g33.1 rigid-tap file execution, NURBS dispatch boundaries, and the comparable canonical runtime edge and program-end cleanup calls. The standalone vendored-source harness, Node WASM smoke, and browser smoke also pin coordinate_offsets MDI/file-path, feed_control_modes, run_step file-execution status output for line number, URI-encoded source statement, return code, and current interpreter axis positions, the position_params MDI/file-path, tool_semantics, and canon_runtime_edges post-program modal, override, spindle, mist, and flood _setup state. Native and WASM standalone checks also cover the user M-code registration boundary for INI-declared M110/M111 handlers while keeping process execution outside the browser/WASM runtime. Node and browser WASM sim-config coverage now run the real vendored axis/geometry/xyzc.ngc and the axis/external_offsets/dyn_demo.ngc, eoffsets.ngc, jwp_z.ngc, and opa_demo.ngc programs with their executable M110/M111 files, opa_demo.ngc's SUBROUTINE_PATH dependency on circles.ngc, axis/foam/foam.ngc with its U/V machine configuration and shared axis/sim.tbl tool table staged beside the INI, and bridge-mill 5axisgui.ngc with its W machine coordinates. The same upstream baseline also validates the current negative fixture error text and absent canonical-event constraints. Fixtures that depend on standalone-only runtime adapters, HAL state, upstream rs274 output gaps such as WAIT or hidden NURBS control-point detail, or richer machine session state still need dedicated native LinuxCNC baselines.

Remaining positive fixtures that are not in the upstream rs274 side-by-side baseline are intentionally held out until they get a dedicated native LinuxCNC baseline: namedparam_semantics still depends on the standalone HAL adapter, while namedparam_ini_semantics now covers the local named-parameter and LinuxCNC _ini[...] subset against upstream rs274 -i. state_tag_motion now compares its motion events with upstream rs274, while UPDATE_TAG events remain a standalone state-tag capture boundary. tool_semantics now compares T/M6/G43/G49 and M61 canonical/current-pocket readback with upstream rs274 -t -i; Interp::synch() current/selected tool slot reads are covered by the native init harness.

The kinematics probes currently cover LinuxCNC identity/trivial kinematics, the switchable 5axiskins XYZBCW bridge-mill model, TRT xyzac/xyzbc table-rotary models, CoreXY, rotated-axis, rose, max, linear-delta, rotary-delta, Scorbot, tripod, SCARA, PUMA, generic serial, generic hexapod, and pentapod models.

linuxcnc_5axis_remap_asset_probe pins the LinuxCNC sample-machine assets that define five-axis switchkins M428, M429, and M430: bridge-mill, dual-rotary, and table-rotary-tilting INI files, remap_subs/*.ngc, HAL switchkins links, tool tables, and demo programs. It verifies that these commands remain LinuxCNC REMAP entries backed by LinuxCNC NGC subroutines using M68, M66, and _hal[motion.switchkins-type]; it does not implement the remap execution path.

linuxcnc_remap_parse_harness links vendored interp_remap.cc for the standalone remap descriptor path. It reads the vendored xyzac-trt, xyzbc-trt, xyzab-tdr, and bridge-mill INI REMAP entries, resolves their remap_subs/*.ngc files through LinuxCNC find_ngc_file(), and validates the resulting _setup.m_remapped descriptors for each machine's LinuxCNC-defined M428/M429/M430 set. Python callbacks remain runtime boundaries. Native and WASM validation now execute the NGC remap/file paths through vendored LinuxCNC O-word dispatch and the standalone HAL adapter boundary.

linuxcnc_duplicate_oword_remap_harness vendors LinuxCNC's upstream tests/remap/duplicate-o-word and tests/remap/m30-interaction files unchanged and runs each test.ngc with its test.ini through vendored Interp::parse_remap(), open(), read(), and execute(). Native, Node WASM, and browser interpreter validation assert the same successful LinuxCNC regression paths, including the remapped M207/M208 messages and final FINISH() event for duplicate O-word, and the M400 M30 remap-level interaction with PROGRAM_END.

linuxcnc_interp_minimal_harness now also runs selected vendored LinuxCNC upstream tests/interp/*/test.ngc files through vendored Interp::open(), read(), and execute(), using LinuxCNC INI SUBROUTINE_PATH for tests/interp/sub-call-from-sub, tests/interp/sequence-number, and tests/interp/nested-sub-error, tests/interp/nested-sub-in-file-error, and tests/interp/abort-hot-comment, plus LinuxCNC [RS274NGC]ORIENT_OFFSET for tests/interp/m19. Native, Node WASM, and browser interpreter validation assert the LinuxCNC canonical messages, canonical events, error texts, and interpreter state for O-word loop/break/subroutine paths, dynamic O-word calls, EXISTS[], subroutine return values, subroutines after main programs, fractional line numbers, named-parameter parsing, M19 spindle-orient offset and wait timeout canonical events, magic-comment parameter formatting, valid external subroutine calls from another external subroutine, external-subroutine #<_line> reporting, nested-subroutine-definition rejection, and blocked forward seek to a later numbered subroutine in the same external file, selected tests/interp/rotation absolute-position #<_abs_x>, #<_abs_y>, and #<_abs_z> reporting under G54, G92, XY rotation, and unit changes plus rotated-coordinate G28 and G53 endpoint behavior, selected tests/interp/m98m99 Fanuc-style M98/M99 subprogram calls, missing-P-word, missing-subprogram, mixed Fanuc/RS274NGC sub-style, and DISABLE_FANUC_STYLE_SUB INI-gated errors, main-program O-word termination rules, parameter-scope differences, loop counts including L0, nested numbered subprograms, subprograms after main program text, leading-zero O-word lookup, named/numbered main programs, and O-expression calls, plus (ABORT,...) hot-comment numbered, named, and INI-parameter expansion, with skipped branch/subroutine messages and post-abort program end asserted absent where applicable. The same native, Node WASM, and browser interpreter validation also stages an INI-declared variable file to verify LinuxCNC G92 startup persistence and the DISABLE_G92_PERSISTENCE startup clear path through vendored interpreter initialization.