linux

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kconfig: split menu.c out of parser.y Compile menu.c as an independent compilation unit. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2021-04-14 00:08:17 +09:00



kbuild: move some helper headers from scripts/kconfig/ to scripts/include/ Move array_size.h, hashtable.h, list.h, list_types.h from scripts/kconfig/ to scripts/include/. These headers will be useful for other host programs. Remove scripts/mod/list.h. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2024-07-20 16:27:38 +09:00
kconfig: use generic macros to implement symbol hashtable Use helper macros in hashtable.h for generic hashtable implementation. We can git rid of the hash head index of for_all_symbols(). Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2024-02-11 21:41:05 +09:00







kconfig: use hash table to reuse expressions Currently, every expression in Kconfig files produces a new abstract syntax tree (AST), even if it is identical to a previously encountered one. Consider the following code: config FOO bool "FOO" depends on (A \|\| B) && C config BAR bool "BAR" depends on (A \|\| B) && C config BAZ bool "BAZ" depends on A \|\| B The "depends on" lines are similar, but currently a separate AST is allocated for each one. The current data structure looks like this: FOO->dep ==> AND BAR->dep ==> AND BAZ->dep ==> OR / \ / \ / \ OR C OR C A B / \ / \ A B A B This is redundant; FOO->dep and BAR->dep have identical ASTs but different memory instances. We can optimize this; FOO->dep and BAR->dep can share the same AST, and BAZ->dep can reference its sub tree. The optimized data structure looks like this: FOO->dep, BAR->dep ==> AND / \ BAZ->dep ==> OR C / \ A B This commit introduces a hash table to keep track of allocated expressions. If an identical expression is found, it is reused. This does not necessarily result in memory savings, as menu_finalize() transforms expressions without freeing up stale ones. This will be addressed later. One optimization that can be easily implemented is caching the expression's value. Once FOO's dependency, (A \|\| B) && C, is calculated, it can be cached, eliminating the need to recalculate it for BAR. This commit also reverts commit e983b7b17ad1 ("kconfig/menu.c: fix multiple references to expressions in menu_add_prop()"). Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2024-09-08 21:43:20 +09:00



kconfig: cache expression values Cache expression values to avoid recalculating them repeatedly. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2024-09-08 21:43:21 +09:00

kconfig: split menu.c out of parser.y Compile menu.c as an independent compilation unit. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2021-04-14 00:08:17 +09:00



kconfig: remove zconf_curname() and zconf_lineno() Now zconf_curname() and zconf_lineno() are so simple that they just return cur_filename, cur_lineno, respectively. Remove these functions, and then use cur_filename and cur_lineno directly. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2024-02-03 00:58:08 +09:00


kconfig: split menu.c out of parser.y Compile menu.c as an independent compilation unit. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2021-04-14 00:08:17 +09:00

27 lines 548 B Raw Normal View History

27 lines

548 B

Raw Normal View History