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Title: bpo-17611. Move unwinding of stack for "pseudo exceptions" from interpreter to compiler. by markshannon · Pull Request #5071 · python/cpython · GitHub

Open Graph Title: bpo-17611. Move unwinding of stack for "pseudo exceptions" from interpreter to compiler. by markshannon · Pull Request #5071 · python/cpython

X Title: bpo-17611. Move unwinding of stack for "pseudo exceptions" from interpreter to compiler. by markshannon · Pull Request #5071 · python/cpython

Description: See bpo-17611 for detailed discussion. This PR: Handles stack unwinding in the compiler rather than the interpreter, getting rid of "pseudo exceptions". Deletes a number of overly complicated bytecodes, either eliminating them entirely or replacing them with simpler alternatives. Removes one field from PyTryBlock reducing the size of a frame by 80 bytes. This PR is not yet ready for merging as it does not include a misc.news entry, updates to Docs/library/dis.rst and the dis module tests fail. If it is agreed that this is to be merged, then I will fill in the missing parts. There are also a couple of further improvements that I would like to make, but have intentionally omitted. I intend to add them in separate PRs: Replace LOAD_ADDR with LOAD_CONST in the peephole optimiser. Fix stack size computation. https://bugs.python.org/issue17611

Open Graph Description: See bpo-17611 for detailed discussion. This PR: Handles stack unwinding in the compiler rather than the interpreter, getting rid of "pseudo exceptions". Deletes a number of overly compli...

X Description: See bpo-17611 for detailed discussion. This PR: Handles stack unwinding in the compiler rather than the interpreter, getting rid of "pseudo exceptions". Deletes a number of overl...

Opengraph URL: https://github.com/python/cpython/pull/5071

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bpo-17611. Move unwinding of stack for "pseudo exceptions" from interpreter to compiler. https://github.com/python/cpython/pull/5071/files#top
Show all changes 12 commits https://github.com/python/cpython/pull/5071/files
5473b29 bpo-17611: Move unwinding of stack from interpreter to compiler markshannon Dec 29, 2017 https://github.com/python/cpython/pull/5071/commits/5473b291437f8b45ece516aa297d5df200315b2e
b9c381d Cleanup pitrou Jul 23, 2017 https://github.com/python/cpython/pull/5071/commits/b9c381d9f4ef9c53c2334dec64bb12185e73e8b8
79d87aa Add JUMP_FINALLY/END_FINALLY bytecodes to implement JSR-style finally… markshannon Dec 29, 2017 https://github.com/python/cpython/pull/5071/commits/79d87aa8e2e65355c74786432012bffe61f908ce
ec6fbd6 Remove WITH_CLEANUP_START and WITH_CLEANUP_FINISH bytecodes. markshannon Dec 30, 2017 https://github.com/python/cpython/pull/5071/commits/ec6fbd66a3d2189452131b7fe29f062787cb96b7
8e87479 Remove WITH_EXCEPT_FINISH bytecode. markshannon Dec 31, 2017 https://github.com/python/cpython/pull/5071/commits/8e874795781b928b1b24d49585aa0c3a75db44e6
37191f6 Add test to verify that unwinding in the compiler works for nested fi… markshannon Dec 31, 2017 https://github.com/python/cpython/pull/5071/commits/37191f690dec123213df3a567a0f7527b0f90be5
f37efd0 Add SETUP_WITH bytecode to push a block with stack offset of -1. Used… markshannon Dec 31, 2017 https://github.com/python/cpython/pull/5071/commits/f37efd02226f205885722cfe2702e947ee8a3e2c
fc35844 Combine all 'type's of try-block handlers. Remove SETUP_FINALLY bytec… markshannon Dec 31, 2017 https://github.com/python/cpython/pull/5071/commits/fc358448eb1ea96b2e534cf2762e1492184acae0
1535786 Tidy up compile.c markshannon Dec 31, 2017 https://github.com/python/cpython/pull/5071/commits/15357860dff212e205fecba0fe0444b56b872424
ef9623a Rename ENTER_WITH to BEGIN_WITH for consistency with BEFORE_ASYNC_WITH. markshannon Jan 1, 2018 https://github.com/python/cpython/pull/5071/commits/ef9623aac6bf4eb082479e08af1368d0faefbe25
e22251d Avoid code duplication. markshannon Jan 1, 2018 https://github.com/python/cpython/pull/5071/commits/e22251d07cd16ea4f3bc10cdc7ca693356ec8710
400d574 Update stack depth calculation to account for new style of finally bl… markshannon Jan 2, 2018 https://github.com/python/cpython/pull/5071/commits/400d574ab5bbbffaf14ec54f4f00f7a8387358d9
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