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gpgscm: Allocate small integers in the rodata section.

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* tests/gpgscm/Makefile.am (gpgscm_SOURCES): Add new file.
* tests/gpgscm/scheme-private.h (struct cell): Move number to the top
of the union so that we can initialize it.
(struct scheme): Remove 'integer_segment'.
* tests/gpgscm/scheme.c (initialize_small_integers): Remove function.
(small_integers): New variable.
(MAX_SMALL_INTEGER): Compute.
(mk_small_integer): Adapt.
(mark): Avoid marking objects already marked.  This allows us to run
the algorithm over objects in the rodata section if they are already
marked.
(scheme_init_custom_alloc): Remove initialization.
(scheme_deinit): Remove deallocation.
* tests/gpgscm/small-integers.h: New file.
--

Allocate small integers from a fixed pool in the rodata section.  This
spares us the initialization, and deduplicates integers across
different processes.  It also makes the integers immutable, increasing
memory safety.

Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2017-03-23 15:21:36 +01:00
parent c9c3fe8832
commit 8640fa880d
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GPG key ID: DD1A52F9DA8C9020
4 changed files with 861 additions and 37 deletions
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7
tests/gpgscm/scheme-private.h
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@ -45,11 +45,11 @@ typedef struct port {
struct cell {
uintptr_t _flag;
union {
num _number;
struct {
char *_svalue;
int _length;
} _string;
num _number;
port *_port;
foreign_func _ff;
struct {
@ -152,11 +152,6 @@ pointer SHARP_HOOK; /* *sharp-hook* */
pointer COMPILE_HOOK; /* *compile-hook* */
#endif
#if USE_SMALL_INTEGERS
/* A fixed allocation of small integers. */
struct cell_segment *integer_segment;
#endif
pointer free_cell; /* pointer to top of free cells */
long fcells; /* # of free cells */
size_t inhibit_gc; /* nesting of gc_disable */