Use cross-platform build environment variables

…14)

14: Warn for raise with three compnents r=ltratt a=nanjekyejoannah This makes sense at the AST hence isolated from the [other exception PR](softdevteam#12) Co-authored-by: Joannah Nanjekye <jnanjekye@python.org>

16: Warn for specific thread module methods r=ltratt a=nanjekyejoannah Dont merge until python#13 and python#14 are merged, some helper code cuts across. This replaces python#15 Threading module Notes Python 2: ``` >>> from thread import get_ident >>> from threading import get_ident Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name get_ident >>> import threading >>> from threading import _get_ident >>> ``` Python 3: ``` >>> from threading import get_ident >>> from thread import get_ident Traceback (most recent call last): File "<stdin>", line 1, in <module> ModuleNotFoundError: No module named 'thread' > ``` **Note:** There is no neutral way of porting Co-authored-by: Joannah Nanjekye <jnanjekye@python.org>

…ally (GH-14)

``` $ python3 --version && uname -a Python 3.10.12 Linux ip-172-31-89-138 6.2.0-1014-aws python#14~22.04.1-Ubuntu SMP Thu Oct 5 22:43:45 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux $ echo AWS-LC PYTHON; echo; ./python bench/benchmarks.py; echo; echo SYSTEM PYTHON; echo; python3 bench/benchmarks.py AWS-LC PYTHON ALGO SIZE (B) TIME (s) ==== ======== ======== TLS 0 0.000771021842956543 TLS 1024 0.0007800400257110595 TLS 1048576 0.0026435813903808595 md5 8 1.9125938415527344e-06 md5 1024 3.813743591308594e-06 md5 1048576 0.0019908883571624755 sha1 8 1.8870830535888672e-06 sha1 1024 3.3450126647949217e-06 sha1 1048576 0.001439645290374756 sha256 8 1.9631385803222656e-06 sha256 1024 5.374908447265625e-06 sha256 1048576 0.0034945359230041505 sha384 8 2.081632614135742e-06 sha384 1024 4.610776901245117e-06 sha384 1048576 0.002470192193984985 sha512 8 2.0771026611328124e-06 sha512 1024 4.634857177734375e-06 sha512 1048576 0.002472785234451294 sha3_256 8 2.4628639221191406e-06 sha3_256 1024 6.587982177734375e-06 sha3_256 1048576 0.0045334467887878415 sha3_384 8 2.4132728576660156e-06 sha3_384 1024 7.719039916992187e-06 sha3_384 1048576 0.005894896745681763 sha3_512 8 2.4335384368896486e-06 sha3_512 1024 1.061868667602539e-05 sha3_512 1048576 0.008451510906219482 SYSTEM PYTHON ALGO SIZE (B) TIME (s) ==== ======== ======== TLS 0 0.0019146842956542969 TLS 1024 0.0019197502136230468 TLS 1048576 0.00295937442779541 md5 8 1.884937286376953e-06 md5 1024 3.789663314819336e-06 md5 1048576 0.00199932861328125 sha1 8 1.8317699432373046e-06 sha1 1024 3.321409225463867e-06 sha1 1048576 0.0014382312297821045 sha256 8 2.0177364349365232e-06 sha256 1024 5.11932373046875e-06 sha256 1048576 0.003096806049346924 sha384 8 2.1207332611083983e-06 sha384 1024 4.274129867553711e-06 sha384 1048576 0.0020926313400268554 sha512 8 2.153873443603516e-06 sha512 1024 4.2979717254638674e-06 sha512 1048576 0.0020925924777984617 sha3_256 8 2.3796558380126953e-06 sha3_256 1024 5.854606628417969e-06 sha3_256 1048576 0.003778960466384888 sha3_384 8 2.38037109375e-06 sha3_384 1024 6.821155548095703e-06 sha3_384 1048576 0.004898728609085083 sha3_512 8 2.3713111877441406e-06 sha3_512 1024 9.174823760986328e-06 sha3_512 1048576 0.007007023334503174 ```

``` $ python3 --version && uname -a Python 3.10.12 Linux ip-172-31-89-138 6.2.0-1014-aws python#14~22.04.1-Ubuntu SMP Thu Oct 5 22:43:45 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux $ ./python bench/benchmarks.py; echo; python3 bench/benchmarks.py OPENSSL VERSION: AWS-LC 1.19.0 ALGO SIZE (B) TIME (s) ==== ======== ======== TLS 0 0.0007833797931671143 TLS 1024 0.0007857415676116944 TLS 1048576 0.002678983211517334 md5 8 1.9640922546386718e-06 md5 1024 3.949642181396484e-06 md5 1048576 0.0019850776195526124 sha1 8 1.847982406616211e-06 sha1 1024 3.45301628112793e-06 sha1 1048576 0.0014366722106933594 sha256 8 1.9931793212890624e-06 sha256 1024 5.559206008911133e-06 sha256 1048576 0.0035069866180419923 sha384 8 2.08735466003418e-06 sha384 1024 4.766225814819336e-06 sha384 1048576 0.0024656279087066652 sha512 8 2.061605453491211e-06 sha512 1024 4.767894744873047e-06 sha512 1048576 0.0024675443172454833 sha3_256 8 2.3877620697021486e-06 sha3_256 1024 6.785154342651367e-06 sha3_256 1048576 0.004528818607330322 sha3_384 8 2.38800048828125e-06 sha3_384 1024 7.86590576171875e-06 sha3_384 1048576 0.0058933842182159425 sha3_512 8 2.4230480194091797e-06 sha3_512 1024 1.0911941528320313e-05 sha3_512 1048576 0.008463276624679565 OPENSSL VERSION: OpenSSL 3.0.2 15 Mar 2022 ALGO SIZE (B) TIME (s) ==== ======== ======== TLS 0 0.0018935666084289552 TLS 1024 0.0019144091606140136 TLS 1048576 0.0029557681083679198 md5 8 1.8961429595947266e-06 md5 1024 3.826141357421875e-06 md5 1048576 0.0019944441318511964 sha1 8 1.855611801147461e-06 sha1 1024 3.2887458801269532e-06 sha1 1048576 0.001434556007385254 sha256 8 1.9848346710205076e-06 sha256 1024 5.077362060546875e-06 sha256 1048576 0.003089451551437378 sha384 8 2.099514007568359e-06 sha384 1024 4.216670989990234e-06 sha384 1048576 0.0020866355895996095 sha512 8 2.0647048950195313e-06 sha512 1024 4.217624664306641e-06 sha512 1048576 0.002087009906768799 sha3_256 8 2.408742904663086e-06 sha3_256 1024 5.91588020324707e-06 sha3_256 1048576 0.0037849726676940916 sha3_384 8 2.4039745330810547e-06 sha3_384 1024 6.922245025634765e-06 sha3_384 1048576 0.004906209945678711 sha3_512 8 2.3734569549560547e-06 sha3_512 1024 9.36126708984375e-06 sha3_512 1048576 0.007021739959716797 ```

``` $ python3 --version && uname -a Python 3.10.12 Linux ip-172-31-89-138 6.2.0-1014-aws python#14~22.04.1-Ubuntu SMP Thu Oct 5 22:43:45 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux $ ./python bench/benchmarks.py; echo; python3 bench/benchmarks.py OPENSSL VERSION: AWS-LC 1.19.0 ALGO SIZE (B) TIME (s) ==== ======== ======== TLS 0 0.0007833797931671143 TLS 1024 0.0007857415676116944 TLS 1048576 0.002678983211517334 md5 8 1.9640922546386718e-06 md5 1024 3.949642181396484e-06 md5 1048576 0.0019850776195526124 sha1 8 1.847982406616211e-06 sha1 1024 3.45301628112793e-06 sha1 1048576 0.0014366722106933594 sha256 8 1.9931793212890624e-06 sha256 1024 5.559206008911133e-06 sha256 1048576 0.0035069866180419923 sha384 8 2.08735466003418e-06 sha384 1024 4.766225814819336e-06 sha384 1048576 0.0024656279087066652 sha512 8 2.061605453491211e-06 sha512 1024 4.767894744873047e-06 sha512 1048576 0.0024675443172454833 sha3_256 8 2.3877620697021486e-06 sha3_256 1024 6.785154342651367e-06 sha3_256 1048576 0.004528818607330322 sha3_384 8 2.38800048828125e-06 sha3_384 1024 7.86590576171875e-06 sha3_384 1048576 0.0058933842182159425 sha3_512 8 2.4230480194091797e-06 sha3_512 1024 1.0911941528320313e-05 sha3_512 1048576 0.008463276624679565 OPENSSL VERSION: OpenSSL 3.0.2 15 Mar 2022 ALGO SIZE (B) TIME (s) ==== ======== ======== TLS 0 0.0018935666084289552 TLS 1024 0.0019144091606140136 TLS 1048576 0.0029557681083679198 md5 8 1.8961429595947266e-06 md5 1024 3.826141357421875e-06 md5 1048576 0.0019944441318511964 sha1 8 1.855611801147461e-06 sha1 1024 3.2887458801269532e-06 sha1 1048576 0.001434556007385254 sha256 8 1.9848346710205076e-06 sha256 1024 5.077362060546875e-06 sha256 1048576 0.003089451551437378 sha384 8 2.099514007568359e-06 sha384 1024 4.216670989990234e-06 sha384 1048576 0.0020866355895996095 sha512 8 2.0647048950195313e-06 sha512 1024 4.217624664306641e-06 sha512 1048576 0.002087009906768799 sha3_256 8 2.408742904663086e-06 sha3_256 1024 5.91588020324707e-06 sha3_256 1048576 0.0037849726676940916 sha3_384 8 2.4039745330810547e-06 sha3_384 1024 6.922245025634765e-06 sha3_384 1048576 0.004906209945678711 sha3_512 8 2.3734569549560547e-06 sha3_512 1024 9.36126708984375e-06 sha3_512 1048576 0.007021739959716797 ```

Fix bug in specialization and make reification atomic

…at (python#14)

Move bytecode_offset=-1 initialization into hir_c_alloc_instr so the invariant is structurally enforced — even if hir_c_init_instr is accidentally skipped, bytecode_offset will be -1 (not 0 from calloc). Add runtime regression test in hir_instr_c_verify.cpp that verifies the invariant for all three allocation paths (raw alloc, init_instr, init_deopt). Runs at startup via __attribute__((constructor)). Addresses gap flagged 5 times (Pythia python#14, python#40, python#59, librarian x2).

exp-json/research now a self-contained fourth branch with 8 shipped C-side optimisations in Modules/_json.c: E3 dispatch reorder, E5 raw PyObject** array, E1 single-pass classifier scan, E9 small-int parse, E10 cached ASCII separators, E11 writer size hint, E7 direct float-to-writer, E14 list-path separator extension. Rejected E2 (manual decoder scan specialisation regressed by 1-2pp; compiler already auto-vectorises). Skipped E4 (roadmap assumed per-instance memo; _default_decoder is already a module singleton). Results vs main (taskset-pinned, 21-run trimmed mean): web-api dumps -13.2% log-line dumps -15.8% NDJSON loads -8.6% bulk dump 100k -14.4% unicode ascii=F -14.6% deep tree rt -12.7% Third-party smoke: simplejson / pydantic / jsonschema / fastapi all produce identical output to main. cpython-perf-ideas.md: struck python#14 (json key-memo LRU — moot) and flagged the `_json.c` radar item as partially landed.

Bug python#14: phx_rc_env_block_state reallocs block_states array, invalidating pred state pointers from collectPredStates. Fix: allocate current block's state BEFORE collecting pred pointers. Also add NULL/empty guard in initializeInState for predecessors whose out-state hasn't been populated yet (backedge case). Found via ASAN: heap-use-after-free in phx_sm_get called from phx_rc_initialize_in_state. match/case pattern matching now compiles.