file_cache Class Reference

#include <input.h>

Collaboration diagram for file_cache:

Data Structures
struct	input_context

Public Member Functions
	file_cache ()
	~file_cache ()
file_cache_slot *	lookup_or_add_file (const char *file_path)
void	forcibly_evict_file (const char *file_path)
void	initialize_input_context (diagnostic_input_charset_callback ccb, bool should_skip_bom)
char_span	get_source_file_content (const char *file_path)
char_span	get_source_line (const char *file_path, int line)
bool	missing_trailing_newline_p (const char *file_path)

Private Member Functions
file_cache_slot *	evicted_cache_tab_entry (unsigned *highest_use_count)
file_cache_slot *	add_file (const char *file_path)
file_cache_slot *	lookup_file (const char *file_path)

Private Attributes
file_cache_slot *	m_file_slots
input_context	in_context

Static Private Attributes
static const size_t	num_file_slots = 16

Detailed Description

A cache of source files for use when emitting diagnostics
(and in a few places in the C/C++ frontends).

Results are only valid until the next call to the cache, as
slots can be evicted.

Filenames are stored by pointer, and so must outlive the cache
instance.   

Constructor & Destructor Documentation

file_cache()

file_cache::file_cache

(

)

file_cache's ctor.   

References initialize_input_context().

~file_cache()

file_cache::~file_cache

(

)

file_cache's dtor.   

References m_file_slots.

Member Function Documentation

add_file()

file_cache_slot * file_cache::add_file ( const char * file_path )

private

Create the cache used for the content of a given file to be
accessed by caret diagnostic.  This cache is added to an array of
cache and can be retrieved by lookup_file_in_cache_tab.  This
function returns the created cache.  Note that only the last
num_file_slots files are cached.

This can return nullptr if the FILE_PATH can't be opened for
reading, or if the content can't be converted to the input_charset.   

References evicted_cache_tab_entry(), fopen, ggc_alloc(), in_context, NULL, and r.

Referenced by lookup_or_add_file().

evicted_cache_tab_entry()

file_cache_slot * file_cache::evicted_cache_tab_entry ( unsigned * highest_use_count )

private

Return the file cache that has been less used, recently, or the
first empty one.  If HIGHEST_USE_COUNT is non-null,
*HIGHEST_USE_COUNT is set to the highest use count of the entries
in the cache table.   

References file_cache_slot::get_file_path(), file_cache_slot::get_use_count(), ggc_alloc(), i, m_file_slots, NULL, and num_file_slots.

Referenced by add_file().

forcibly_evict_file()

void file_cache::forcibly_evict_file

(

const char *

file_path

)

Purge any mention of FILENAME from the cache of files used for
printing source code.  For use in selftests when working
with tempfiles.   

References gcc_assert, ggc_alloc(), lookup_file(), and r.

get_source_file_content()

char_span file_cache::get_source_file_content

(

const char *

file_path

)

References file_cache_slot::get_full_file_content(), ggc_alloc(), and lookup_or_add_file().

Referenced by sarif_builder::maybe_make_artifact_content_object().

get_source_line()

char_span file_cache::get_source_line	(	const char *	file_path,
		int	line )

Return the physical source line that corresponds to FILE_PATH/LINE.
The line is not nul-terminated.  The returned pointer is only
valid until the next call of location_get_source_line.
Note that the line can contain several null characters,
so the returned value's length has the actual length of the line.
If the function fails, a NULL char_span is returned.   

References ggc_alloc(), lookup_or_add_file(), NULL, and file_cache_slot::read_line_num().

Referenced by asm_show_source(), edited_file::get_num_lines(), sarif_builder::get_source_lines(), edited_file::print_content(), edited_file::print_diff_hunk(), and edited_file::print_run_of_changed_lines().

initialize_input_context()

void file_cache::initialize_input_context	(	diagnostic_input_charset_callback	ccb,
		bool	should_skip_bom )

References file_cache::input_context::ccb, default_charset_callback(), in_context, and file_cache::input_context::should_skip_bom.

Referenced by file_cache(), and diagnostic_context::initialize_input_context().

lookup_file()

file_cache_slot * file_cache::lookup_file ( const char * file_path )

private

Lookup the cache used for the content of a given file accessed by
caret diagnostic.  Return the found cached file, or NULL if no
cached file was found.   

References gcc_assert, file_cache_slot::get_file_path(), ggc_alloc(), i, file_cache_slot::inc_use_count(), m_file_slots, NULL, num_file_slots, and r.

Referenced by forcibly_evict_file(), and lookup_or_add_file().

lookup_or_add_file()

file_cache_slot * file_cache::lookup_or_add_file

(

const char *

file_path

)

Lookup the cache used for the content of a given file accessed by
caret diagnostic.  If no cached file was found, create a new cache
for this file, add it to the array of cached file and return
it.

This can return nullptr on a cache miss if FILE_PATH can't be opened for
reading, or if the content can't be converted to the input_charset.   

References add_file(), ggc_alloc(), lookup_file(), NULL, and r.

Referenced by get_source_file_content(), get_source_line(), and missing_trailing_newline_p().

missing_trailing_newline_p()

bool file_cache::missing_trailing_newline_p

(

const char *

file_path

)

Determine if FILE_PATH missing a trailing newline on its final line.
Only valid to call once all of the file has been loaded, by
requesting a line number beyond the end of the file.   

References gcc_assert, ggc_alloc(), lookup_or_add_file(), and r.

Referenced by edited_file::get_num_lines().

Field Documentation

in_context

input_context file_cache::in_context

private

Referenced by add_file(), and initialize_input_context().

m_file_slots

file_cache_slot* file_cache::m_file_slots

private

Referenced by evicted_cache_tab_entry(), lookup_file(), and ~file_cache().

num_file_slots

const size_t file_cache::num_file_slots = 16

staticprivate

Referenced by evicted_cache_tab_entry(), and lookup_file().

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The documentation for this class was generated from the following files:

• input.h
• input.cc