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bpo-26415: reduce peak memory consumption by the parser #10995

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bpo-26415: reduce peak memory consumption by the parser #10995

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1 change: 1 addition & 0 deletions .gitattributes
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Expand Up @@ -59,3 +59,4 @@ Doc/library/token-list.inc linguist-generated=true
Include/token.h linguist-generated=true
Lib/token.py linguist-generated=true
Parser/token.c linguist-generated=true
Modules/gramvalid.c linguist-generated=true
1 change: 1 addition & 0 deletions Include/node.h
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Expand Up @@ -22,6 +22,7 @@ PyAPI_FUNC(node *) PyNode_New(int type);
PyAPI_FUNC(int) PyNode_AddChild(node *n, int type,
char *str, int lineno, int col_offset,
int end_lineno, int end_col_offset);
PyAPI_FUNC(void) PyNode_Compress(node *n);
PyAPI_FUNC(void) PyNode_Free(node *n);
#ifndef Py_LIMITED_API
PyAPI_FUNC(Py_ssize_t) _PyNode_SizeOf(node *n);
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4 changes: 3 additions & 1 deletion Makefile.pre.in
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Expand Up @@ -794,9 +794,11 @@ regen-grammar: regen-token
$(PYTHON_FOR_REGEN) -m Parser.pgen $(srcdir)/Grammar/Grammar \
$(srcdir)/Grammar/Tokens \
$(srcdir)/Include/graminit.h.new \
$(srcdir)/Python/graminit.c.new
$(srcdir)/Python/graminit.c.new \
$(srcdir)/Modules/gramvalid.c.new
$(UPDATE_FILE) $(srcdir)/Include/graminit.h $(srcdir)/Include/graminit.h.new
$(UPDATE_FILE) $(srcdir)/Python/graminit.c $(srcdir)/Python/graminit.c.new
$(UPDATE_FILE) $(srcdir)/Modules/gramvalid.c $(srcdir)/Modules/gramvalid.c.new

.PHONY=regen-ast
regen-ast:
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2018-12-06-16-55-19.bpo-26415.jbufv5.rst
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@@ -0,0 +1,3 @@
Reduce peak memory consumption by the parser, by compressing some
branchless stretches in the parse tree into a single node. AST is
not affected.
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