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* bpo-38693: Use f-strings instead of str.format() within importlib (#17058)Gregory P. Smith2022-10-061-0/+1783
| | | | | | | | | This is a small performance improvement, especially for one or two hot places such as _handle_fromlist() that are called a lot and the .format() method was being used just to join two strings with a dot. Otherwise it is merely a readability improvement. We keep `_ERR_MSG` and `_ERR_MSG_PREFIX` as those may be used elsewhere for canonical looking error messages.
* bpo-45019: Add a tool to generate list of modules to include for frozen ↵Eric Snow2021-08-301-2581/+0
| | | | | | | modules (gh-27980) Frozen modules must be added to several files in order to work properly. Before this change this had to be done manually. Here we add a tool to generate the relevant lines in those files instead. This helps us avoid mistakes and omissions. https://bugs.python.org/issue45019
* bpo-43392: Optimize repeated calls to `__import__()` (GH-24735)Germán Méndez Bravo2021-08-121-512/+519
| | | | | | | | | | | | | | | | | | | | | Implements a two steps check in `importlib._bootstrap._find_and_load()` to avoid locking when the module has been already imported and it's ready. --- Using `importlib.__import__()`, after this, does show a big difference: Before: ``` $ ./python -c 'import timeit; print(timeit.timeit("__import__(\"timeit\")", setup="from importlib import __import__"))' 15.92248619502061 ``` After: ``` $ ./python -c 'import timeit; print(timeit.timeit("__import__(\"timeit\")", setup="from importlib import __import__"))' 1.206068897008663 ``` ---
* bpo-44885: Correct the ast locations of f-strings with format specs and ↵Pablo Galindo Salgado2021-08-121-3/+3
| | | | repeated expressions (GH-27729)
* bpo-44840: Compiler: Move duplication of exit blocks with no line numbers to ↵Mark Shannon2021-08-091-2327/+2324
| | | | after CFG optimization. (GH-27656)
* bpo-44717: improve AttributeError on circular imports of submodules (GH-27338)Filipe Laíns2021-07-241-1732/+1749
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* Revert "bpo-44717: improve AttributeError on circular imports of submodules ↵Pablo Galindo Salgado2021-07-241-1749/+1732
| | | | | (GH-27299)" (GH-27331) This reverts commit 8072a1181dd64135f700b44372fbf7bf91e68072.
* bpo-44717: improve AttributeError on circular imports of submodules (GH-27299)Filipe Laíns2021-07-241-1732/+1749
| | | | | Signed-off-by: Filipe Laíns <lains@riseup.net> Co-authored-by: Łukasz Langa <lukasz@langa.pl>
* bpo-44626: Merge basic blocks earlier to enable better handling of exit ↵Mark Shannon2021-07-151-1470/+1480
| | | | blocks without line numbers (GH-27138)
* bpo-44530: Add co_qualname field to PyCodeObject (GH-26941)Gabriele N. Tornetta2021-07-071-2533/+2518
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* bpo-43950: Add code.co_positions (PEP 657) (GH-26955)Pablo Galindo2021-07-021-1774/+2404
| | | | | | | | | | | | | | | This PR is part of PEP 657 and augments the compiler to emit ending line numbers as well as starting and ending columns from the AST into compiled code objects. This allows bytecodes to be correlated to the exact source code ranges that generated them. This information is made available through the following public APIs: * The `co_positions` method on code objects. * The C API function `PyCode_Addr2Location`. Co-authored-by: Batuhan Taskaya <isidentical@gmail.com> Co-authored-by: Ammar Askar <ammar@ammaraskar.com>
* Make sure that line number is set correctly for call to __exit__ when ↵Mark Shannon2021-06-241-1729/+1729
| | | | handling exception in body of a with statement. (GH-26890)
* bpo-43693 Get rid of CO_NOFREE -- it's unused (GH-26839)Guido van Rossum2021-06-231-81/+81
| | | | | | All uses of this flag are either setting it or in doc or tests for it. So we should be able to get rid of it completely.
* bpo-43693: Turn localspluskinds into an object (GH-26749)Guido van Rossum2021-06-211-1749/+1776
| | | Managing it as a bare pointer to malloc'ed bytes is just too awkward in a few places.
* bpo-43693: Eliminate unused "fast locals". (gh-26587)Eric Snow2021-06-151-1446/+1445
| | | | | Currently, if an arg value escapes (into the closure for an inner function) we end up allocating two indices in the fast locals even though only one gets used. Additionally, using the lower index would be better in some cases, such as with no-arg `super()`. To address this, we update the compiler to fix the offsets so each variable only gets one "fast local". As a consequence, now some cell offsets are interspersed with the locals (only when an arg escapes to an inner function). https://bugs.python.org/issue43693
* bpo-43693: Un-revert commit f3fa63e. (#26609)Eric Snow2021-06-081-1470/+1470
| | | | | | | | | This was reverted in GH-26596 (commit 6d518bb) due to some bad memory accesses. * Add the MAKE_CELL opcode. (gh-26396) The memory accesses have been fixed. https://bugs.python.org/issue43693
* Revert "bpo-43693: Add the MAKE_CELL opcode and interleave fast locals ↵Pablo Galindo2021-06-081-1470/+1470
| | | | | offsets. (gh-26396)" (GH-26597) This reverts commit 631f9938b1604d4f893417ec339b9e0fa9196fb1.
* bpo-43693: Add the MAKE_CELL opcode and interleave fast locals offsets. ↵Eric Snow2021-06-071-1470/+1470
| | | | | | | (gh-26396) This moves logic out of the frame initialization code and into the compiler and eval loop. Doing so simplifies the runtime code and allows us to optimize it better. https://bugs.python.org/issue43693
* bpo-43693: Un-revert commits 2c1e258 and b2bf2bc. (gh-26577)Eric Snow2021-06-071-1635/+1597
| | | | | | | | | | These were reverted in gh-26530 (commit 17c4edc) due to refleaks. * 2c1e258 - Compute deref offsets in compiler (gh-25152) * b2bf2bc - Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388) This change fixes the refleaks. https://bugs.python.org/issue43693
* bpo-43693: Revert commits 2c1e2583fdc4db6b43d163239ea42b0e8394171f and ↵Pablo Galindo2021-06-041-1597/+1635
| | | | | | | | | | | | | b2bf2bc1ece673d387341e06c8d3c2bc6e259747 (GH-26530) * Revert "bpo-43693: Compute deref offsets in compiler (gh-25152)" This reverts commit b2bf2bc1ece673d387341e06c8d3c2bc6e259747. * Revert "bpo-43693: Add new internal code objects fields: co_fastlocalnames and co_fastlocalkinds. (gh-26388)" This reverts commit 2c1e2583fdc4db6b43d163239ea42b0e8394171f. These two commits are breaking the refleak buildbots.
* bpo-43693: Compute deref offsets in compiler (gh-25152)Mark Shannon2021-06-041-4/+4
| | | | | | Merges locals and cells into a single array. Saves a pointer in the interpreter and means that we don't need the LOAD_CLOSURE opcode any more https://bugs.python.org/issue43693
* bpo-43693: Add new internal code objects fields: co_fastlocalnames and ↵Eric Snow2021-06-031-1635/+1597
| | | | | | | | | | | | | | | | | co_fastlocalkinds. (gh-26388) A number of places in the code base (notably ceval.c and frameobject.c) rely on mapping variable names to indices in the frame "locals plus" array (AKA fast locals), and thus opargs. Currently the compiler indirectly encodes that information on the code object as the tuples co_varnames, co_cellvars, and co_freevars. At runtime the dependent code must calculate the proper mapping from those, which isn't ideal and impacts performance-sensitive sections. This is something we can easily address in the compiler instead. This change addresses the situation by replacing internal use of co_varnames, etc. with a single combined tuple of names in locals-plus order, along with a minimal array mapping each to its kind (local vs. cell vs. free). These two new PyCodeObject fields, co_fastlocalnames and co_fastllocalkinds, are not exposed to Python code for now, but co_varnames, etc. are still available with the same values as before (though computed lazily). Aside from the (mild) performance impact, there are a number of other benefits: * there's now a clear, direct relationship between locals-plus and variables * code that relies on the locals-plus-to-name mapping is simpler * marshaled code objects are smaller and serialize/de-serialize faster Also note that we can take this approach further by expanding the possible values in co_fastlocalkinds to include specific argument types (e.g. positional-only, kwargs). Doing so would allow further speed-ups in _PyEval_MakeFrameVector(), which is where args get unpacked into the locals-plus array. It would also allow us to shrink marshaled code objects even further. https://bugs.python.org/issue43693
* bpo-44298: Fix line numbers for early exits in with statements. (GH-26513)Mark Shannon2021-06-031-1770/+1770
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* bpo-43693: Add _PyCode_New(). (gh-26375)Eric Snow2021-05-271-1483/+1461
| | | | | This is an internal-only API that helps us manage the many values used to create a code object. https://bugs.python.org/issue43693
* bpo-26110: Add ``CALL_METHOD_KW`` opcode to speedup method calls with ↵Ken Jin2021-05-151-5/+5
| | | | | | | | | keywords (GH-26014) * Add CALL_METHOD_KW * Make CALL_METHOD branchless too since it shares the same code * Place parentheses in STACK_SHRINK
* bpo-43933: Force RETURN_VALUE bytecodes to have line numbers (GH-26054)Mark Shannon2021-05-121-1730/+1731
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* bpo-40222: "Zero cost" exception handling (GH-25729)Mark Shannon2021-05-071-1709/+1798
| | | | | | | | "Zero cost" exception handling. * Uses a lookup table to determine how to handle exceptions. * Removes SETUP_FINALLY and POP_TOP block instructions, eliminating (most of) the runtime overhead of try statements. * Reduces the size of the frame object by about 60%.
* bpo-43933: Set frame.f_lineno during call to __exit__ (GH-25719)Mark Shannon2021-04-301-1300/+1301
| | | * Set line number of __exit__ call in a with statement to be that of the with keyword.
* bpo-42739: Don't use sentinels to mark end of line table. (GH-25657)Mark Shannon2021-04-291-1606/+1597
| | | | | * Add length parameter to PyLineTable_InitAddressRange and doen't use sentinel values at end of table. Makes the line number table more robust. * Update PyCodeAddressRange to match PEP 626.
* bpo-41323: compiler: Reuse tuple in constant tuple folding (GH-25419)Inada Naoki2021-04-161-663/+663
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* bpo-42135: Deprecate implementations of find_module() and find_loader() ↵Brett Cannon2021-04-061-732/+750
| | | | (GH-25169)
* bpo-27129: Use instruction offsets, not byte offsets, in bytecode and ↵Mark Shannon2021-04-011-1089/+1084
| | | | | | | internally. (GH-25069) * Use instruction offset, rather than bytecode offset. Streamlines interpreter dispatch a bit, and removes most EXTENDED_ARGs for jumps. * Change some uses of PyCode_Addr2Line to PyFrame_GetLineNumber
* bpo-42134: Raise ImportWarning when calling find_module() in the import ↵Brett Cannon2021-03-301-441/+448
| | | | system (GH-25044)
* bpo-42136: Deprecate module_repr() as found in importlib (GH-25022)Brett Cannon2021-03-261-772/+786
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* bpo-42137: have ModuleType.__repr__ prefer __spec__ over module_repr() ↵Brett Cannon2021-03-241-123/+124
| | | | | (GH-24953) This is to work towards the removal of the use of module_repr() in Python 3.12 (documented as deprecated since 3.4).
* bpo-39316: Make sure that attribute accesses and stores, including method ↵Mark Shannon2021-03-141-3/+3
| | | | calls, conform to PEP 626. (GH-24859)
* bpo-42217: compiler: merge same co_code and co_linetable objects (GH-23056)Inada Naoki2021-02-101-1576/+1568
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* bpo-42908: Mark cleanup code at end of try-except and with artificial (#24202)Mark Shannon2021-01-131-1576/+1577
| | | | | | | | | * Mark bytecodes at end of try-except as artificial. * Make sure that the CFG is consistent throughout optimiization. * Extend line-number propagation logic so that implicit returns after 'try-except' or 'with' have the correct line numbers. * Update importlib
* bpo-42810: Mark jumps at end of if and try statements as artificial. (GH-24091)Mark Shannon2021-01-041-801/+801
| | | | | | | * Mark jumps at end of if and try statements as artificial. * Update importlib * Add comment explaining the purpose of ADDOP_JUMP_NOLINE.
* bpo-42246: Don't eliminate jumps to jumps, if it will break PEP 626. (GH-23896)Mark Shannon2020-12-231-765/+766
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* bpo-42634: Mark reraise after except blocks as artificial. (GH-23877)Mark Shannon2020-12-211-1726/+1729
| | | | | | | * Mark reraise after except blocks as artificial. * Update importlib * Update dis test.
* bpo-42246: Make sure that `f_lasti`, and thus `f_lineno`, is set correctly ↵Mark Shannon2020-12-171-43/+43
| | | | | | | | | after raising or reraising an exception (GH-23803) * Ensure that f_lasti is set correctly after an exception is raised to conform to PEP 626. * Update importlib * Add NEWS.
* bpo-42645: Make sure that return/break/continue are only traced once when ↵Mark Shannon2020-12-161-1660/+1660
| | | | | | | | | exiting via a finally block. (GH-23780) * Make sure that return/break/continue are only traced once when exiting via a finally block. * Add test for return in try-finally. * Update importlib
* bpo-42615: Delete redundant jump instructions that only bypass empty blocks ↵Om G2020-12-161-101/+101
| | | | | | | | | | | | | | | | | | | | | | | (GH-23733) * Delete jump instructions that bypass empty blocks * Add news entry * Explicitly check for unconditional jump opcodes Using the is_jump function results in the inclusion of instructions like returns for which this optimization is not really valid. So, instead explicitly check that the instruction is an unconditional jump. * Handle conditional jumps, delete jumps gracefully * Ensure b_nofallthrough and b_reachable are valid * Add test for redundant jumps * Regenerate importlib.h and edit Misc/ACKS * Fix bad whitespace
* bpo-42246: Remove DO_NOT_EMIT_BYTECODE macros, so that while loops and if ↵Mark Shannon2020-12-151-1704/+1705
| | | | statements conform to PEP 626. (GH-23743)
* bpo-42635: Mark JUMP_ABSOLUTE at end of 'for' loop as artificial to avoid ↵Mark Shannon2020-12-141-1756/+1756
| | | | spurious line events. (GH-23761)
* Don't generate spurious line number in try-except-finally. (#23760)Mark Shannon2020-12-141-1489/+1489
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* bpo-26131: Deprecate usage of load_module() (GH-23469)Brett Cannon2020-12-041-1779/+1811
| | | Raise an ImportWarning when the import system falls back on load_module(). As for implementations of load_module(), raise a DeprecationWarning.
* bpo-42246: Don't forget the entry block when ensuring that all exits have a ↵Mark Shannon2020-12-041-1/+1
| | | | | line number (GH-23636) Don't forget the entry block when ensuring that all exits have a line number.
* bpo-42246: Make sure that line number is correct after a return, as required ↵Mark Shannon2020-12-021-1439/+1436
| | | | | by PEP 626 (GH-23495) Make sure that line number is correct after a return, as defined by PEP 626.
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