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Fuse the three stacks into a single one.

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In order to make it easy to perform benchmarks to ensure that there are no
performance loss, lalr1.cc is forked into lalr1-fusion.cc.  Eventually,
lalr1-fusion.cc will replace lalr1.cc.

Meanwhile, to make sure that lalr1-fusion.cc is correctly exercized by the
test suite, the user must install a symbolic link from lalr1.cc to it.

Instead of having three stacks (state, value, location), use a stack
of triples.  This considerably simplifies the code (and it will be
easier not to require locations as currently does the C++ parser),
and also gives a 10% speedup according to etc/bench (probably mainly since
memory allocation is done once instead of three times).

Another motivation is to make it easier to destruct properly
semantic values: now that they are bound to their state (hence
symbol type) it will be easier to call the appropriate destructor.

These changes should probably benefit the C parser too.

	* data/lalr1.cc: Copy as...  * data/lalr1-fusion.cc: this new
	file.
	(b4_rhs_value, b4_rhs_location): New definitions overriding those
	from c++.m4.
	(state_stack_type, semantic_stack_type, location_stack_type)
	(yystate_stack_, yysemantic_stack_, yylocation_stack_): Remove.
	(data_type, stack_type, yystack_): New.
	(YYLLOC_DEFAULT, yypush_): Adjust.
	(yyerror_range): Now based on data_type, not location_type.
This commit is contained in:
Akim Demaille
2008-10-22 05:25:11 -05:00
parent 7dedf26e55
commit 0e0ed236ab
2 changed files with 1378 additions and 0 deletions
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@@ -1,3 +1,35 @@
2008-11-03 Akim Demaille <demaille@gostai.com>
Fuse the three stacks into a single one.
In order to make it easy to perform benchmarks to ensure that there are no
performance loss, lalr1.cc is forked into lalr1-fusion.cc. Eventually,
lalr1-fusion.cc will replace lalr1.cc.
Meanwhile, to make sure that lalr1-fusion.cc is correctly exercized by the
test suite, the user must install a symbolic link from lalr1.cc to it.
Instead of having three stacks (state, value, location), use a stack
of triples. This considerably simplifies the code (and it will be
easier not to require locations as currently does the C++ parser),
and also gives a 10% speedup according to etc/bench (probably mainly since
memory allocation is done once instead of three times).
Another motivation is to make it easier to destruct properly
semantic values: now that they are bound to their state (hence
symbol type) it will be easier to call the appropriate destructor.
These changes should probably benefit the C parser too.
* data/lalr1.cc: Copy as... * data/lalr1-fusion.cc: this new
file.
(b4_rhs_value, b4_rhs_location): New definitions overriding those
from c++.m4.
(state_stack_type, semantic_stack_type, location_stack_type)
(yystate_stack_, yysemantic_stack_, yylocation_stack_): Remove.
(data_type, stack_type, yystack_): New.
(YYLLOC_DEFAULT, yypush_): Adjust.
(yyerror_range): Now based on data_type, not location_type.
2008-11-03 Akim Demaille <demaille@gostai.com>
Push the state, value, and location at the same time.

1346
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