bpo-17611. Move unwinding of stack for "pseudo exceptions" from interpreter to compiler.#5071

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markshannon wants to merge 12 commits intopython:masterfrom

markshannon:unwind-stack-in-compiler

Commits on Dec 29, 2017

bpo-17611: Move unwinding of stack from interpreter to compiler
markshannon
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Cleanup

pitrou
authored and
markshannon
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Commits on Jan 2, 2018

Add JUMP_FINALLY/END_FINALLY bytecodes to implement JSR-style finally block handling.
markshannon
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Remove WITH_CLEANUP_START and WITH_CLEANUP_FINISH bytecodes.
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Remove WITH_EXCEPT_FINISH bytecode.
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Add test to verify that unwinding in the compiler works for nested finally blocks. Potential bug pointed out by Neil Schemenauer.
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Add SETUP_WITH bytecode to push a block with stack offset of -1. Used for correct compiliation of with statement.
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Combine all 'type's of try-block handlers. Remove SETUP_FINALLY bytecode as it is now fully synonymous with SETUP_EXCEPT.
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Tidy up compile.c
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Rename ENTER_WITH to BEGIN_WITH for consistency with BEFORE_ASYNC_WITH.
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Avoid code duplication.
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Update stack depth calculation to account for new style of finally blocks. Fixes bpo-24340.
markshannon
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