suspect-devices/circuitpython/py/showbc.c, branch master CircuitPython - a Python implementation for teaching coding with microcontrollers https://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=master 2019-10-08T02:16:11+00:00 mp_bytecode_print_str: avoid undefined behavior 2019-10-08T02:16:11+00:00 Jeff Epler jepler@gmail.com 2019-10-08T01:48:25+00:00 urn:sha1:85f0048d22a31f34d991e56757560f1b39c007b6 Left shift of negative numbers is undefined in the "C" standard. Multiplying by 128 has the intended effect (in the absence of integer overflow, anyway), can be implemented using the same shift instruction, but does not invoke undefined behavior. This problem was found using clang 7's scan-build static analyzer. py: Clean up unary and binary enum list to keep groups together. 2017-10-04T23:49:44+00:00 Damien George damien.p.george@gmail.com 2017-10-03T12:34:28+00:00 urn:sha1:0864a6957fe4717c3ec40ceeb373b19614a18434 2 non-bytecode binary ops (NOT_IN and IN_NOT) are moved out of the bytecode group, so this change will change the bytecode format. py: Clarify which mp_unary_op_t's may appear in the bytecode. 2017-09-25T23:35:19+00:00 Paul Sokolovsky pfalcon@users.sourceforge.net 2017-09-25T23:35:19+00:00 urn:sha1:9d836fedbdb1d28bdfc4ba475bbdfc1adb3f007a Not all can, so we don't need to reserve bytecodes for them, and can use free slots for something else later. all: Use the name MicroPython consistently in comments 2017-07-31T08:35:40+00:00 Alexander Steffen devel.20.webmeister@spamgourmet.com 2017-06-30T07:22:17+00:00 urn:sha1:55f33240f3d7051d4213629e92437a36f1fac50e There were several different spellings of MicroPython present in comments, when there should be only one. py: Add LOAD_SUPER_METHOD bytecode to allow heap-free super meth calls. 2017-04-22T13:39:20+00:00 Damien George damien.p.george@gmail.com 2017-04-18T23:45:59+00:00 urn:sha1:dd11af209d226b7d18d5148b239662e30ed60bad This patch allows the following code to run without allocating on the heap: super().foo(...) Before this patch such a call would allocate a super object on the heap and then load the foo method and call it right away. The super object is only needed to perform the lookup of the method and not needed after that. This patch makes an optimisation to allocate the super object on the C stack and discard it right after use. Changes in code size due to this patch are: bare-arm: +128 minimal: +232 unix x64: +416 unix nanbox: +364 stmhal: +184 esp8266: +340 cc3200: +128 py: Allow bytecode/native to put iter_buf on stack for simple for loops. 2017-02-16T07:38:06+00:00 Damien George damien.p.george@gmail.com 2016-01-09T23:59:52+00:00 urn:sha1:f4df3aaa72a0460614b1ab8b7b8a7927a1165e31 So that the "for x in it: ..." statement can now work without using the heap (so long as the iterator argument fits in an iter_buf structure). py/showbc: Make sure to set the const_table before printing bytecode. 2017-01-27T01:34:09+00:00 Damien George damien.p.george@gmail.com 2017-01-27T01:34:09+00:00 urn:sha1:cc4c1adf6e05dcda54393fe512e47463fc45414e py/showbc: Make printf's go to the platform print stream. 2016-09-20T01:30:54+00:00 Damien George damien.p.george@gmail.com 2016-09-20T01:30:54+00:00 urn:sha1:fbddea929d28fa75ecc4e964500eca3f2ac32e4b The system printf is no longer used by the core uPy code. Instead, the platform print stream or DEBUG_printf is used. Using DEBUG_printf in the showbc functions would mean that the code can't be tested by the test suite, so use the normal output instead. This patch also fixes parsing of bytecode-line-number mappings. py: Combine 3 comprehension opcodes (list/dict/set) into 1. 2016-09-19T02:28:03+00:00 Damien George damien.p.george@gmail.com 2016-09-18T22:46:01+00:00 urn:sha1:adaf0d865cd6c81fb352751566460506392ed55f With the previous patch combining 3 emit functions into 1, it now makes sense to also combine the corresponding VM opcodes, which is what this patch does. This eliminates 2 opcodes which simplifies the VM and reduces code size, in bytes: bare-arm:44, minimal:64, unix(NDEBUG,x86-64):272, stmhal:92, esp8266:200. Profiling (with a simple script that creates many list/dict/set comprehensions) shows no measurable change in performance. py: Make UNARY_OP_NOT a first-class op, to agree with Py not semantics. 2015-12-10T22:19:48+00:00 Damien George damien.p.george@gmail.com 2015-12-08T12:28:11+00:00 urn:sha1:bdbe8c9ae21559f6dc0b8e1ad84b7bbec2a04726 Fixes #1684 and makes "not" match Python semantics. The code is also simplified (the separate MP_BC_NOT opcode is removed) and the patch saves 68 bytes for bare-arm/ and 52 bytes for minimal/. Previously "not x" was implemented as !mp_unary_op(x, MP_UNARY_OP_BOOL), so any given object only needs to implement MP_UNARY_OP_BOOL (and the VM had a special opcode to do the ! bit). With this patch "not x" is implemented as mp_unary_op(x, MP_UNARY_OP_NOT), but this operation is caught at the start of mp_unary_op and dispatched as !mp_obj_is_true(x). mp_obj_is_true has special logic to test for truthness, and is the correct way to handle the not operation.