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URL: http://github.com/python/cpython/commit/981d172f7f0613d30bef4a8934b361db7fcf0672

GH-112354: `END_FOR` instruction to only pop one value. (GH-114247) · python/cpython@981d172 · GitHub
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GH-112354: END_FOR instruction to only pop one value. (GH-114247)
* Compiler emits END_FOR; POP_TOP instead of END_FOR. To support tier 2 side exits in loops.
1 parent 6fadd68 commit 981d172

16 files changed

Lines changed: 238 additions & 184 deletions

‎Doc/library/dis.rst‎

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@@ -546,8 +546,8 @@ operations on it as if it was a Python list. The top of the stack corresponds to
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.. opcode:: END_FOR
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Removes the top two values from the stack.
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Equivalent to ``POP_TOP``; ``POP_TOP``.
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Removes the top-of-stack item.
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Equivalent to ``POP_TOP``.
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Used to clean up at the end of loops, hence the name.
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.. versionadded:: 3.12

‎Include/internal/pycore_global_objects_fini_generated.h‎

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‎Include/internal/pycore_global_strings.h‎

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@@ -276,9 +276,11 @@ struct _Py_global_strings {
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STRUCT_FOR_ID(after_in_child)
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STRUCT_FOR_ID(after_in_parent)
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STRUCT_FOR_ID(aggregate_class)
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STRUCT_FOR_ID(alias)
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STRUCT_FOR_ID(allow_code)
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STRUCT_FOR_ID(append)
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STRUCT_FOR_ID(argdefs)
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STRUCT_FOR_ID(args)
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STRUCT_FOR_ID(arguments)
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STRUCT_FOR_ID(argv)
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STRUCT_FOR_ID(as_integer_ratio)
@@ -402,6 +404,8 @@ struct _Py_global_strings {
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STRUCT_FOR_ID(errors)
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STRUCT_FOR_ID(event)
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STRUCT_FOR_ID(eventmask)
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STRUCT_FOR_ID(exc_type)
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STRUCT_FOR_ID(exc_value)
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STRUCT_FOR_ID(excepthook)
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STRUCT_FOR_ID(exception)
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STRUCT_FOR_ID(existing_file_name)
@@ -655,6 +659,7 @@ struct _Py_global_strings {
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STRUCT_FOR_ID(seek)
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STRUCT_FOR_ID(seekable)
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STRUCT_FOR_ID(selectors)
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STRUCT_FOR_ID(self)
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STRUCT_FOR_ID(send)
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STRUCT_FOR_ID(sep)
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STRUCT_FOR_ID(sequence)
@@ -717,6 +722,7 @@ struct _Py_global_strings {
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STRUCT_FOR_ID(timetuple)
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STRUCT_FOR_ID(top)
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STRUCT_FOR_ID(trace_callback)
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STRUCT_FOR_ID(traceback)
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STRUCT_FOR_ID(trailers)
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STRUCT_FOR_ID(translate)
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STRUCT_FOR_ID(true)

‎Include/internal/pycore_opcode_metadata.h‎

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‎Include/internal/pycore_runtime_init_generated.h‎

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‎Include/internal/pycore_unicodeobject_generated.h‎

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‎Lib/importlib/_bootstrap_external.py‎

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@@ -464,6 +464,7 @@ def _write_atomic(path, data, mode=0o666):
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# Python 3.13a1 3565 (Oparg of YIELD_VALUE indicates whether it is in a yield-from)
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# Python 3.13a1 3566 (Emit JUMP_NO_INTERRUPT instead of JUMP for non-loop no-lineno cases)
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# Python 3.13a1 3567 (Reimplement line number propagation by the compiler)
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# Python 3.13a1 3568 (Change semantics of END_FOR)
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# Python 3.14 will start with 3600
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@@ -480,7 +481,7 @@ def _write_atomic(path, data, mode=0o666):
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# Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
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# in PC/launcher.c must also be updated.
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MAGIC_NUMBER = (3567).to_bytes(2, 'little') + b'\r\n'
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MAGIC_NUMBER = (3568).to_bytes(2, 'little') + b'\r\n'
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_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
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‎Lib/test/test_compiler_codegen.py‎

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@@ -49,6 +49,7 @@ def test_for_loop(self):
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('JUMP', loop_lbl),
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exit_lbl,
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('END_FOR', None),
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('POP_TOP', None),
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('LOAD_CONST', 0),
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('RETURN_VALUE', None),
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]

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