This filter is documented in wp-includes/general-template.php
wp_loginout
Display the Log In/Out link.
get_search_form
Filters the HTML output of the search form.
search_form_format
Filters the HTML format of the search form.
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search_form_args
Filters the array of arguments used when generating the search form.
pre_get_search_form
Fires before the search form is retrieved, at the start of get_search_form().
get_search_form
Display search form.
get_template_part
Fires before a template part is loaded.
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get_template_part_{$slug}
Fires before the specified template part file is loaded.
get_template_part
Loads a template part into a template.
get_sidebar
Fires before the sidebar template file is loaded.
get_sidebar
Load sidebar template.
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get_footer
Fires before the footer template file is loaded.
get_footer
Load footer template.
get_header
Fires before the header template file is loaded.