Added inline function analyzer

[alexcekay]

Added an inline function analyzer to identify potential FLASH savings.

[niklaut]

Very cool tool!

Added my (cosmetic) review as a fixup commit:

• Added dataclasses
• Unprivated the __functions otherwise they wouldn't show in the docs.
• Made all paths render as relative to CWD.

As a functional improvement I would recommend to add an integer (or float?) argument that describes the storage overhead of converting an inlined function into a non-inlined function. It would need at least a 16-bit branch instruction and probably also require moving around some registers. Perhaps best we just measure it for the largest candidate and then use that as an average number. I would assume that this gives a more realistic and smaller list of candidates (and filters out very small inlined functions).

[niklaut]

This is epic!

[niklaut]

Example output:

 $ python -m emdbg.analyze.inline -f build/px4_fmu-v6x_default/px4_fmu-v6x_default.elf --overhead 16

src/lib/conversion/rotation.h:161 -- Total Size: 4248 (3.55%) -- Total Size without instruction overhead: 4120 (14.85%)
                                                                  ╷                               ╷           ╷      ╷                           ╷
  Translation unit                                                │ File name                     │ File line │ Size │ Call instruction overhead │ %
 ═════════════════════════════════════════════════════════════════╪═══════════════════════════════╪═══════════╪══════╪═══════════════════════════╪═══════
  src/drivers/optical_flow/pmw3901/PMW3901.cpp                    │ src/lib/conversion/rotation.h │ 396       │ 482  │ 16                        │ 11.35
  src/modules/commander/mag_calibration.cpp                       │ src/lib/conversion/rotation.h │ 396       │ 274  │ 16                        │ 6.45
  src/modules/sensors/vehicle_optical_flow/VehicleOpticalFlow.cpp │ src/lib/conversion/rotation.h │ 396       │ 242  │ 16                        │ 5.70
  src/lib/drivers/magnetometer/PX4Magnetometer.cpp                │ src/lib/conversion/rotation.h │ 396       │ 298  │ 16                        │ 7.02
  src/lib/drivers/accelerometer/PX4Accelerometer.cpp              │ src/lib/conversion/rotation.h │ 380       │ 1046 │ 16                        │ 24.62
  src/lib/drivers/accelerometer/PX4Accelerometer.cpp              │ src/lib/conversion/rotation.h │ 396       │ 430  │ 16                        │ 10.12
  src/lib/drivers/gyroscope/PX4Gyroscope.cpp                      │ src/lib/conversion/rotation.h │ 380       │ 1046 │ 16                        │ 24.62
  src/lib/drivers/gyroscope/PX4Gyroscope.cpp                      │ src/lib/conversion/rotation.h │ 396       │ 430  │ 16                        │ 10.12
                                                                  ╵                               ╵           ╵      ╵                           ╵

src/lib/conversion/rotation.h:378 -- Total Size: 2672 (2.23%) -- Total Size without instruction overhead: 2640 (9.52%)
                                                     ╷                                                    ╷           ╷      ╷                           ╷
  Translation unit                                   │ File name                                          │ File line │ Size │ Call instruction overhead │ %
 ════════════════════════════════════════════════════╪════════════════════════════════════════════════════╪═══════════╪══════╪═══════════════════════════╪═══════
  src/lib/drivers/accelerometer/PX4Accelerometer.cpp │ src/lib/drivers/accelerometer/PX4Accelerometer.cpp │ 144       │ 1336 │ 16                        │ 50.00
  src/lib/drivers/gyroscope/PX4Gyroscope.cpp         │ src/lib/drivers/gyroscope/PX4Gyroscope.cpp         │ 143       │ 1336 │ 16                        │ 50.00
                                                     ╵                                                    ╵           ╵      ╵                           ╵

src/lib/world_magnetic_model/geo_mag_declination.cpp:69 -- Total Size: 2068 (1.73%) -- Total Size without instruction overhead: 2004 (7.22%)
                                                       ╷                                                      ╷           ╷      ╷                           ╷
  Translation unit                                     │ File name                                            │ File line │ Size │ Call instruction overhead │ %
 ══════════════════════════════════════════════════════╪══════════════════════════════════════════════════════╪═══════════╪══════╪═══════════════════════════╪═══════
  src/lib/world_magnetic_model/geo_mag_declination.cpp │ src/lib/world_magnetic_model/geo_mag_declination.cpp │ 125       │ 522  │ 16                        │ 25.24
  src/lib/world_magnetic_model/geo_mag_declination.cpp │ src/lib/world_magnetic_model/geo_mag_declination.cpp │ 113       │ 514  │ 16                        │ 24.85
  src/lib/world_magnetic_model/geo_mag_declination.cpp │ src/lib/world_magnetic_model/geo_mag_declination.cpp │ 107       │ 514  │ 16                        │ 24.85
  src/lib/world_magnetic_model/geo_mag_declination.cpp │ src/lib/world_magnetic_model/geo_mag_declination.cpp │ 125       │ 518  │ 16                        │ 25.05
                                                       ╵                                                      ╵           ╵      ╵                           ╵

src/lib/conversion/rotation.h:394 -- Total Size: 2016 (1.69%) -- Total Size without instruction overhead: 1936 (6.98%)
                                                                  ╷                                                                 ╷           ╷      ╷                           ╷
  Translation unit                                                │ File name                                                       │ File line │ Size │ Call instruction overhead │ %
 ═════════════════════════════════════════════════════════════════╪═════════════════════════════════════════════════════════════════╪═══════════╪══════╪═══════════════════════════╪═══════
  src/modules/commander/mag_calibration.cpp                       │ src/modules/commander/mag_calibration.cpp                       │ 785       │ 330  │ 16                        │ 16.37
  src/modules/sensors/vehicle_optical_flow/VehicleOpticalFlow.cpp │ src/modules/sensors/vehicle_optical_flow/VehicleOpticalFlow.cpp │ 276       │ 304  │ 16                        │ 15.08
  src/lib/drivers/magnetometer/PX4Magnetometer.cpp                │ src/lib/drivers/magnetometer/PX4Magnetometer.cpp                │ 72        │ 374  │ 16                        │ 18.55
  src/lib/drivers/accelerometer/PX4Accelerometer.cpp              │ src/lib/drivers/accelerometer/PX4Accelerometer.cpp              │ 117       │ 504  │ 16                        │ 25.00
  src/lib/drivers/gyroscope/PX4Gyroscope.cpp                      │ src/lib/drivers/gyroscope/PX4Gyroscope.cpp                      │ 117       │ 504  │ 16                        │ 25.00
                                                                  ╵                                                                 ╵           ╵      ╵                           ╵