Improve sys.settrace to help support debugpy / pdb debugging by andrewleech · Pull Request #8767 · micropython/micropython

andrewleech · 2022-06-16T23:48:37Z

Companion support for micropython/micropython-lib#1022 & micropython/micropython-lib#499

Requires micropython be built with MICROPY_PY_SYS_SETTRACE eg. unix standard variant

Includes:

sys/settrace: Add sys._getframe() function.
Refer to https://docs.python.org/3/library/sys.html#sys._getframe
sys/settrace: Add frame.f_trace object support.
f_trace holds a python obj on the frame, used in bdb to track active trace function for call stack.

codecov-commenter · 2022-06-20T00:09:22Z

Codecov Report

❌ Patch coverage is 51.42857% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.39%. Comparing base (2dc2e30) to head (3280c2a).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
py/profile.c	44.82%	16 Missing ⚠️
py/modsys.c	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8767      +/-   ##
==========================================
- Coverage   98.46%   98.39%   -0.08%     
==========================================
  Files         176      176              
  Lines       22784    22816      +32     
==========================================
+ Hits        22435    22450      +15     
- Misses        349      366      +17

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Requires micropython/micropython#8767

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

dpgeorge · 2022-06-27T02:24:27Z

+MP_DEFINE_CONST_FUN_OBJ_0(mp_sys_gettrace_obj, mp_sys_gettrace);
+
+// _getframe(): Return current frame object.
+STATIC mp_obj_t mp_sys_getframe(size_t n_args, const mp_obj_t *args) {


please call it mp_sys__getframe

dpgeorge · 2022-06-27T02:26:22Z

+    if (attr == MP_QSTR___code__) {
+        mp_obj_fun_bc_t *self = MP_OBJ_TO_PTR(self_in);
+        mp_obj_code_t *code = MP_OBJ_TO_PTR(mp_obj_new_code(self->context, self->rc));
+        if (code != NULL) {


can code be null?

dpgeorge · 2022-06-27T02:32:04Z

    switch (attr) {
        case MP_QSTR_f_back:
            dest[0] = mp_const_none;
            if (o->code_state->prev_state) {
+                if (!o->code_state->prev_state->frame) {


did you find a case where this could be NULL? maybe it needs a test...

dpgeorge · 2022-06-27T02:33:24Z

+            dest[0] = o->trace_obj;
+            break;
+        case MP_QSTR_f_locals:
+            dest[0] = MP_OBJ_FROM_PTR(o->code->dict_locals);


is this needed? locals in uPy doesn't work well

can we just return an empty dict instead?

dpgeorge · 2022-06-27T02:33:58Z

@@ -274,6 +292,7 @@ mp_obj_t mp_obj_new_frame(const mp_code_state_t *code_state) {
    o->lineno = mp_prof_bytecode_lineno(rc, o->lasti);
    o->trace_opcodes = false;
    o->callback = MP_OBJ_NULL;
+    o->trace_obj = MP_OBJ_NULL;


maybe call it f_trace

dpgeorge · 2022-06-27T02:35:11Z

@@ -60,7 +61,9 @@ mp_obj_t mp_obj_new_frame(const mp_code_state_t *code_state);

 // This is the implementation for the sys.settrace
 mp_obj_t mp_prof_settrace(mp_obj_t callback);
+mp_obj_t mp_prof_gettrace();


please put void in arg list

dpgeorge · 2022-06-27T02:35:58Z

@@ -313,6 +332,33 @@ mp_obj_t mp_prof_settrace(mp_obj_t callback) {
    return mp_const_none;
 }

+mp_obj_t mp_prof_gettrace() {


void in arg list

dpgeorge · 2022-06-27T02:38:19Z

+    return prof_trace_cb;
+}
+
+mp_obj_t mp_prof_get_frame(int depth) {


can we change int to size_t to indicate it can't be negative?

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

github-actions · 2023-08-24T01:07:00Z

Code size report:

Reference:  extmod: Add USB Network (NCM) driver implementation. [1c3c201]
Comparison: py/profile: Keep tracing usable after a trace callback raises. [merge of a764b6c]
  mpy-cross:    +0 +0.000% 
   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64: +39512 +4.536% standard[incl +14208(data)]
      stm32:    +0 +0.000% PYBV10
      esp32:    +0 +0.000% ESP32_GENERIC
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS
  qemu rv32:    +0 +0.000% VIRT_RV32

Re-enable binascii.crc32()

projectgus · 2024-03-07T23:51:51Z

This is an automated heads-up that we've just merged a Pull Request
that removes the STATIC macro from MicroPython's C API.

See #13763

A search suggests this PR might apply the STATIC macro to some C code. If it
does, then next time you rebase the PR (or merge from master) then you should
please replace all the STATIC keywords with static.

Although this is an automated message, feel free to @-reply to me directly if
you have any questions about this.

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

Add sys.gettrace() to mirror settrace, add sys._getframe() for stack frame inspection, and enable sys.settrace() by default on unix standard variant. These additions provide the baseline infrastructure needed for pdb and debugpy to function on MicroPython. Signed-off-by: Andrew Leech <[email protected]>

…#8767) Improve sys.settrace to support debugpy/pdb debugging: adds sys.settrace, sys.gettrace, sys._getframe, frame.f_trace, and enables settrace on the unix standard variant.

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

A raising callback leaves mp_prof_callback_invoke through an nlr jump, so mp_prof_is_executing stayed set for the rest of the process. Every trace hook in the VM tests that flag, so no callback was ever invoked again while sys.settrace() and sys.gettrace() went on reporting success: tracing was silently and permanently off, and a fresh sys.settrace() could not recover it. With assertions enabled the same state trips assert(!mp_prof_is_executing) in mp_prof_frame_enter. The call is now wrapped in nlr_push/nlr_pop; the exception path clears the guard, unsets the trace callback and re-raises. Unsetting matches CPython, and it is what makes the state after a raise recoverable rather than merely different: a callback that raised once is on an error path and would raise again on every subsequent line, which on a device is unrecoverable. A debugger that means to keep tracing re-installs explicitly. TRACE_TICK now also requires the global callback to still be set. Without it "unset" does not unset: frames already on the stack hold the callback the tracer returned for them and go on calling it, so sys.settrace(None) did not stop tracing the frames that were running. A deliberate raise from a trace callback is how a debugger unwinds a target out of a frame it is stopped in - with no second thread and a message pump that runs inside the trace function, it is the only mechanism available. tests/misc/sys_settrace_raise.py covers propagation into the traced program, the unset, that a following sys.settrace() traces exactly as much as it did before the raise, and settrace(None) called from inside a traced frame. It has no .exp file deliberately: the output is identical under CPython, so the test runner compares the two. Signed-off-by: Andrew Leech <[email protected]>

octoprobe-bot · 2026-08-10T01:06:09Z

Octoprobe PR report

Duration: 2h 10min, 113422 tests run, 69ms/test
Tested ports: esp32 esp8266 mimxrt nrf rp2 samd stm32
Summary Report , Logdirectory

Test	Tests passed	Tests skipped	Tests xfailed	Tests failed
format flash	9	8
run-tests.py	30396	4389	15	50
run-tests.py --via-mpy --emit native	32756	5899	54	70
run-tests.py --via-mpy	32828	4678	14	59
run-perfbench.py	388	15	2
run-natmodtests.py	732	146	11
run-mpremote-tests.sh	308			84
run-tests.py --test-dirs=extmod_hardware	154	148	64	39
run-tests.py --test-dirs=extmod_hardware --emit-native	160	158	66	39
Total	97731	15441	226	341

Failures

Group: run-mpremote-tests.sh

Test	esp32 0c30- ESP32_C3_DEVKIT	esp32 5d21- ESP32_DEVKIT	esp32 472b- ESP32_S3_DEVKIT	esp32 1830- LOLIN_C3_MINI	esp8266 7921- LOLIN_D1_MINI	mimxrt 1133- TEENSY40	nrf 3c2a- ARDUINO_NANO_33	rp2 5334- RPI_PICO2	rp2 5334- RPI_PICO2- RISCV	rp2 552b- RPI_PICO2_W	rp2 6038- RPI_PICO_W	samd 5f2a- ADA_ITSYBITSY_M0	stm32 2b35- NUCLEO_WB55	stm32 7b21- PYBV11	stm32 3a21- PYBV11- DP	stm32 3a21- PYBV11- DP_THREAD	stm32 7b21- PYBV11- THREAD
test_recursive_cp.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_errno.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_resume.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_fs_tree.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_filesystem.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_mip_local_install.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	FAIL FAIL FAIL	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_eval_exec_run.sh	_pass _pass _pass	_pass _pass _pass	pass FAIL FAIL	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass	_pass	_pass _pass _pass	_pass _pass _pass	_pass _pass _pass
test_mount.sh	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL

Group: run-tests.py --test-dirs=extmod_hardware

Test	esp32 0c30- ESP32_C3_DEVKIT	esp32 5d21- ESP32_DEVKIT	esp32 472b- ESP32_S3_DEVKIT	esp32 1830- LOLIN_C3_MINI	esp8266 7921- LOLIN_D1_MINI	mimxrt 1133- TEENSY40	nrf 3c2a- ARDUINO_NANO_33	rp2 5334- RPI_PICO2	rp2 5334- RPI_PICO2- RISCV	rp2 552b- RPI_PICO2_W	rp2 5f2c- RPI_PICO_W	samd 5f2a- ADA_ITSYBITSY_M0	stm32 2b35- NUCLEO_WB55	stm32 7b21- PYBV11	stm32 3a21- PYBV11- DP	stm32 3a21- PYBV11- DP_THREAD	stm32 7b21- PYBV11- THREAD
extmod_hardware/machine_can2.py	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	FAIL FAIL FAIL	skip	skip skip skip	skip	skip skip [skip](https://reports.octoprobe.org/github\_selfhosted\_testrun\_737/RUN-TESTS\_EXTMOD\_HARDWARE@5334-...[Comment body truncated]*

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767 Signed-off-by: Andrew Leech <[email protected]>

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech force-pushed the pdb_support branch 2 times, most recently from 16bd204 to e027113 Compare June 19, 2022 23:51

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Jun 20, 2022

bdb: Re-enable usage of frame.f_trace.

c1d415b

Requires micropython/micropython#8767

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Jun 20, 2022

bdb: Re-enable usage of frame.f_trace.

c03abd8

Requires micropython/micropython#8767

andrewleech mentioned this pull request Jun 21, 2022

Draft: Working towards pdb debugging support. micropython/micropython-lib#499

Open

andrewleech force-pushed the pdb_support branch from e027113 to f3c6bf2 Compare June 22, 2022 00:37

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Jun 22, 2022

bdb: Add initial micropython support.

b690b51

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Jun 22, 2022

bdb: Add initial micropython support.

6f5221d

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Jun 22, 2022

bdb: Add initial micropython support.

da52b43

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

dpgeorge reviewed Jun 27, 2022

View reviewed changes

dpgeorge added the py-core Relates to py/ directory in source label Jun 29, 2022

dpgeorge changed the title ~~Draft: Working towards pdb debugging support.~~ Improve sys.settrace support to help support bdb/pdb debugging Jun 29, 2022

dpgeorge changed the title ~~Improve sys.settrace support to help support bdb/pdb debugging~~ Improve sys.settrace to help support bdb/pdb debugging Jun 29, 2022

rkompass mentioned this pull request Dec 27, 2022

m.iMX RT: After a few seconds print() hangs #10335

Closed

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Aug 24, 2023

bdb: Add initial micropython support.

448c386

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

andrewleech force-pushed the pdb_support branch from f3c6bf2 to c32fec4 Compare August 24, 2023 00:57

RetiredWizard pushed a commit to RetiredWizard/micropython that referenced this pull request Dec 30, 2023

Merge pull request micropython#8767 from dhalbert/turn-on-crc32

1d13364

Re-enable binascii.crc32()

Gadgetoid mentioned this pull request Feb 29, 2024

global: Remove the STATIC macro. #13763

Merged

andrewleech pushed a commit to andrewleech/micropython-lib that referenced this pull request Jun 11, 2025

bdb: Add initial micropython support.

1f036b1

Requires micropython to be compiled with MICROPY_PY_SYS_SETTRACE. Also requires micropython/micropython#8767

andrewleech force-pushed the pdb_support branch from c32fec4 to b55ccd4 Compare June 11, 2025 00:32

andrewleech mentioned this pull request Jun 11, 2025

python-ecosys/debugpy: Add VS Code debugging support for MicroPython. micropython/micropython-lib#1022

Open

andrewleech changed the title ~~Improve sys.settrace to help support bdb/pdb debugging~~ Improve sys.settrace to help support debugpy / pdb debugging Jun 11, 2025

andrewleech force-pushed the pdb_support branch from b55ccd4 to a7ae522 Compare June 11, 2025 12:22

andrewleech force-pushed the pdb_support branch 4 times, most recently from 0bbcb6e to e0237a8 Compare March 26, 2026 05:12

andrewleech force-pushed the pdb_support branch from e0237a8 to 3280c2a Compare March 30, 2026 20:39

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Jul 14, 2026

Merge branch 'pdb_support'

668eacc

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech mentioned this pull request Jul 14, 2026

py/settrace: Preserve local variable names in frame.f_locals. andrewleech/micropython#5

Open

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Jul 14, 2026

Merge branch 'pdb_support'

87a514a

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Jul 14, 2026

Merge branch 'pdb_support'

c287c75

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 4, 2026

Merge branch 'pdb_support'

c3dfed8

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

11f15f3

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

e1d4cdc

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

461cb23

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

2afdf18

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

1f7e242

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

1e325dd

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

c3ae429

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 5, 2026

Merge branch 'pdb_support'

a23b1b4

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 6, 2026

Merge branch 'pdb_support'

93cd855

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Aug 6, 2026

Merge branch 'pdb_support'

0046e23

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech force-pushed the pdb_support branch from 139da48 to a764b6c Compare August 22, 2026 07:04

andrewleech mentioned this pull request Sep 26, 2026

py/vm: Report loop lines again after backward jumps andrewleech/micropython#73

Draft

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Sep 27, 2026

Merge branch 'pdb_support'

9221129

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Sep 27, 2026

Merge branch 'pdb_support'

9655b4c

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

andrewleech pushed a commit to andrewleech/micropython that referenced this pull request Sep 27, 2026

Merge branch 'pdb_support'

6e7f2b0

sys.settrace: gettrace, _getframe, f_trace support (PR micropython#8767) MBM-PR: 8767 MBM-URL: micropython#8767

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Group: run-mpremote-tests.sh

Group: run-tests.py --test-dirs=extmod_hardware

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