Commit Graph

34 Commits

Author SHA1 Message Date
Serhiy Storchaka 87d5180b7a
Remove misleading comment in the AST optimizer (#29825) 2021-11-29 11:19:59 +03:00
Mark Shannon b931077375
bpo-45753: Make recursion checks more efficient. (GH-29524)
* Uses recursion remaining, instead of recursion depth to speed up check against recursion limit.
2021-11-16 11:01:57 +00:00
Serhiy Storchaka 8b01067318
bpo-28307: Tests and fixes for optimization of C-style formatting (GH-26318)
Fix errors:
* "%10.s" should be equal to "%10.0s", not "%10s".
* Tuples with starred expressions caused a SyntaxError.
2021-05-23 19:06:48 +03:00
Serhiy Storchaka a0bd9e9c11
bpo-28307: Convert simple C-style formatting with literal format into f-string. (GH-5012)
C-style formatting with literal format containing only format codes
%s, %r and %a (with optional width, precision and alignment)
will be converted to an equivalent f-string expression.

It can speed up formatting more than 2 times by eliminating
runtime parsing of the format string and creating temporary tuple.
2021-05-08 22:33:10 +03:00
Brandt Bucher dbe60ee09d
bpo-43892: Validate the first term of complex literal value patterns (GH-25735) 2021-04-29 17:19:28 -07:00
Nick Coghlan 1e7b858575
bpo-43892: Make match patterns explicit in the AST (GH-25585)
Co-authored-by: Brandt Bucher <brandtbucher@gmail.com>
2021-04-28 22:58:44 -07:00
Serhiy Storchaka face87c94e
bpo-42609: Check recursion depth in the AST validator and optimizer (GH-23744) 2021-04-25 13:38:00 +03:00
Pablo Galindo b0544ba77c
bpo-38605: Revert making 'from __future__ import annotations' the default (GH-25490)
This reverts commits 044a1048ca and 1be456ae9d, adapting the code to changes that happened after it.
2021-04-21 12:41:19 +01:00
Victor Stinner d27f8d2e07
bpo-43244: Rename pycore_ast.h functions to _PyAST_xxx() (GH-25252)
Rename AST functions of pycore_ast.h to use the "_PyAST_" prefix.
Remove macros creating aliases without prefix. For example, Module()
becomes _PyAST_Module(). Update Grammar/python.gram to use
_PyAST_xxx() functions.
2021-04-07 21:34:22 +02:00
Victor Stinner d36d6a9c18
bpo-43244: Remove Yield macro from pycore_ast.h (GH-25243)
* pycore_ast.h no longer defines the Yield macro.
* Fix a compiler warning on Windows: "warning C4005: 'Yield': macro
  redefinition".
* Python-ast.c now defines directly functions with their real
  _Py_xxx() name, rather than xxx().
* Remove "#undef Yield" in C files including pycore_ast.h.
2021-04-07 13:01:09 +02:00
Victor Stinner 8370e07e1e
bpo-43244: Remove the pyarena.h header (GH-25007)
Remove the pyarena.h header file with functions:

* PyArena_New()
* PyArena_Free()
* PyArena_Malloc()
* PyArena_AddPyObject()

These functions were undocumented, excluded from the limited C API,
and were only used internally by the compiler.

Add pycore_pyarena.h header. Rename functions:

* PyArena_New() => _PyArena_New()
* PyArena_Free() => _PyArena_Free()
* PyArena_Malloc() => _PyArena_Malloc()
* PyArena_AddPyObject() => _PyArena_AddPyObject()
2021-03-24 02:23:01 +01:00
Victor Stinner a81fca6ec8
bpo-43244: Add pycore_compile.h header file (GH-25000)
Remove the compiler functions using "struct _mod" type, because the
public AST C API was removed:

* PyAST_Compile()
* PyAST_CompileEx()
* PyAST_CompileObject()
* PyFuture_FromAST()
* PyFuture_FromASTObject()

These functions were undocumented and excluded from the limited C API.

Rename functions:

* PyAST_CompileObject() => _PyAST_Compile()
* PyFuture_FromASTObject() => _PyFuture_FromAST()

Moreover, _PyFuture_FromAST() is no longer exported (replace
PyAPI_FUNC() with extern). _PyAST_Compile() remains exported for
test_peg_generator.

Remove also compatibility functions:

* PyAST_Compile()
* PyAST_CompileEx()
* PyFuture_FromAST()
2021-03-24 00:51:50 +01:00
Victor Stinner 526fdeb227
bpo-43244: Add pycore_ast.h header file (GH-24908)
Move _PyAST_GetDocString() and _PyAST_ExprAsUnicode() functions the
internal C API: from Include/ast.h to a new
Include/internal/pycore_ast.h header file. Don't export these
functions anymore: replace PyAPI_FUNC() with extern.

Remove also unused includes.
2021-03-17 23:50:50 +01:00
Brandt Bucher 145bf269df
bpo-42128: Structural Pattern Matching (PEP 634) (GH-22917)
Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Talin <viridia@gmail.com>
Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
2021-02-26 14:51:55 -08:00
Nick Coghlan 8805a4dad2
bpo-42282: Fold constants inside named expressions (GH-23190)
* The AST optimiser wasn't descending into named expressions, so
  any constant subexpressions weren't being folded at compile time
* Remove "default:" clauses inside the AST optimiser code to reduce the
  risk of similar bugs passing unnoticed in future compiler changes
2020-11-07 22:35:17 +10:00
Batuhan Taskaya 044a1048ca
bpo-38605: Make 'from __future__ import annotations' the default (GH-20434)
The hard part was making all the tests pass; there are some subtle issues here, because apparently the future import wasn't tested very thoroughly in previous Python versions.

For example, `inspect.signature()` returned type objects normally (except for forward references), but strings with the future import. We changed it to try and return type objects by calling `typing.get_type_hints()`, but fall back on returning strings if that function fails (which it may do if there are future references in the annotations that require passing in a specific namespace to resolve).
2020-10-06 13:03:02 -07:00
Pablo Galindo a5634c4067
bpo-41746: Add type information to asdl_seq objects (GH-22223)
* Add new capability to the PEG parser to type variable assignments. For instance:
```
       | a[asdl_stmt_seq*]=';'.small_stmt+ [';'] NEWLINE { a }
```

* Add new sequence types from the asdl definition (automatically generated)
* Make `asdl_seq` type a generic aliasing pointer type.
* Create a new `asdl_generic_seq` for the generic case using `void*`.
* The old `asdl_seq_GET`/`ast_seq_SET` macros now are typed.
* New `asdl_seq_GET_UNTYPED`/`ast_seq_SET_UNTYPED` macros for dealing with generic sequences.
* Changes all possible `asdl_seq` types to use specific versions everywhere.
2020-09-16 19:42:00 +01:00
Pablo Galindo c5fc156852
bpo-40334: PEP 617 implementation: New PEG parser for CPython (GH-19503)
Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
2020-04-22 23:29:27 +01:00
Pablo Galindo 33986465bd
bpo-39522: Always initialise kind attribute in constant ast nodes (GH-19525) 2020-04-14 21:40:41 +01:00
Pablo Galindo d112c600ab
bpo-39220: Do not optimise annotation if 'from __future__ import annotations' is used (GH-17866)
Do not apply AST-based optimizations if 'from __future__ import annotations' is used in order to
prevent information lost in the final version of the annotations.
2020-03-18 23:02:09 +00:00
Serhiy Storchaka 13d52c2686
bpo-34822: Simplify AST for subscription. (GH-9605)
* Remove the slice type.
* Make Slice a kind of the expr type instead of the slice type.
* Replace ExtSlice(slices) with Tuple(slices, Load()).
* Replace Index(value) with a value itself.

All non-terminal nodes in AST for expressions are now of the expr type.
2020-03-10 18:52:34 +02:00
Batuhan Taşkaya d82e469048
bpo-39639: Remove the AST "Suite" node and associated code (GH-18513)
The AST "Suite" node is no longer used and it can be removed from the ASDL definition and related structures (compiler, visitors, ...).

Co-Authored-By: Victor Stinner <vstinner@python.org>
Co-authored-by: Brett Cannon <54418+brettcannon@users.noreply.github.com>
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
2020-03-04 16:16:46 +00:00
Anthony Sottile b121a4a45f Fix constant folding optimization for positional only arguments (GH-17837) 2020-01-05 17:03:56 +00:00
Ivan Levkivskyi 9932a22897
bpo-33416: Add end positions to Python AST (GH-11605)
The majority of this PR is tediously passing `end_lineno` and `end_col_offset` everywhere. Here are non-trivial points:
* It is not possible to reconstruct end positions in AST "on the fly", some information is lost after an AST node is constructed, so we need two more attributes for every AST node `end_lineno` and `end_col_offset`.
* I add end position information to both CST and AST.  Although it may be technically possible to avoid adding end positions to CST, the code becomes more cumbersome and less efficient.
* Since the end position is not known for non-leaf CST nodes while the next token is added, this requires a bit of extra care (see `_PyNode_FinalizeEndPos`). Unless I made some mistake, the algorithm should be linear.
* For statements, I "trim" the end position of suites to not include the terminal newlines and dedent (this seems to be what people would expect), for example in
  ```python
  class C:
      pass

  pass
  ```
  the end line and end column for the class definition is (2, 8).
* For `end_col_offset` I use the common Python convention for indexing, for example for `pass` the `end_col_offset` is 4 (not 3), so that `[0:4]` gives one the source code that corresponds to the node.
* I added a helper function `ast.get_source_segment()`, to get source text segment corresponding to a given AST node. It is also useful for testing.

An (inevitable) downside of this PR is that AST now takes almost 25% more memory. I think however it is probably justified by the benefits.
2019-01-22 11:18:22 +00:00
Victor Stinner 5f2df88b63
bpo-35177: Add dependencies between header files (GH-10361)
* ast.h now includes Python-ast.h and node.h
* parsetok.h now includes node.h and grammar.h
* symtable.h now includes Python-ast.h
* Modify asdl_c.py to enhance Python-ast.h:

  * Add #ifndef/#define Py_PYTHON_AST_H to be able to include the header
    twice
  * Add "extern { ... }" for C++
  * Undefine "Yield" macro conflicting with winbase.h

* Remove "#undef Yield" from C files, it's now done in Python-ast.h
* Remove now useless includes in C files
2018-11-12 00:56:19 +01:00
Serhiy Storchaka 3f22811fef
bpo-32892: Use ast.Constant instead of specific constant AST types. (GH-9445) 2018-09-27 17:42:37 +03:00
Serhiy Storchaka 143ce5c6db
bpo-33691: Add _PyAST_GetDocString(). (GH-7236) 2018-05-30 10:56:16 +03:00
Serhiy Storchaka 73cbe7a01a
bpo-32911: Revert bpo-29463. (GH-7121) (GH-7197)
Remove the docstring attribute of AST types and restore docstring
expression as a first stmt in their body.

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>
2018-05-29 12:04:55 +03:00
Serhiy Storchaka 3f7e9aa2ef
bpo-32925: Optimized iterating and containing test for literal lists (GH-5842)
consisting of non-constants: `x in [a, b]` and `for x in [a, b]`.
The case of all constant elements already was optimized.
2018-03-11 10:54:47 +02:00
Victor Stinner 05d68a8bd8
bpo-9566: Fix size_t=>int downcast warnings (#5230)
* Use wider types (int => Py_ssize_t) to avoid integer overflows.
* Fix gc.get_freeze_count(): use Py_ssize_t type rather than int, since gc_list_size() returns a Py_ssize_t.
2018-01-18 11:15:25 +01:00
Serhiy Storchaka 3dfbaf51f0
bpo-32372: Move __debug__ optimization to the AST level. (#4925) 2017-12-25 12:47:50 +02:00
Serhiy Storchaka 2e3f570185
bpo-30416: Protect the optimizer during constant folding. (#4860)
It no longer spends much time doing complex calculations and no
longer consumes much memory for creating large constants that will
be dropped later.

This fixes also bpo-21074.
2017-12-15 14:11:43 +02:00
Serhiy Storchaka 15a8728415
bpo-29469: Optimize literal lists and sets iterating on the AST level. (#4866) 2017-12-14 20:24:31 +02:00
INADA Naoki 7ea143ae79
bpo-29469: Move constant folding to AST optimizer (GH-2858) 2017-12-14 16:47:20 +09:00