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xdiff: PATIENCE/HISTOGRAM are not independent option bits 

Because the default Myers, patience and histogram algorithms cannot be in
effect at the same time, XDL_PATIENCE_DIFF and XDL_HISTOGRAM_DIFF are not
independent bits.  Instead of wasting one bit per algorithm, define a few
macros to access the few bits they occupy and update the code that access
them.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2012-02-19 15:36:55 -08:00
parent e5b06629de
commit 307ab20b33
8 changed files with 24 additions and 20 deletions
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4
diff.c
View File

@ -3400,9 +3400,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
else if (!strcmp(arg, "--ignore-space-at-eol"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
else if (!strcmp(arg, "--patience"))
DIFF_XDL_SET(options, PATIENCE_DIFF);
options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
else if (!strcmp(arg, "--histogram"))
DIFF_XDL_SET(options, HISTOGRAM_DIFF);
options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
/* flags options */
else if (!strcmp(arg, "--binary")) {

2
diff.h
View File

@ -88,6 +88,8 @@ typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data)
#define DIFF_XDL_SET(opts, flag) ((opts)->xdl_opts |= XDF_##flag)
#define DIFF_XDL_CLR(opts, flag) ((opts)->xdl_opts &= ~XDF_##flag)
#define DIFF_WITH_ALG(opts, flag) (((opts)->xdl_opts & ~XDF_DIFF_ALGORITHM_MASK) | XDF_##flag)
enum diff_words_type {
DIFF_WORDS_NONE = 0,
DIFF_WORDS_PORCELAIN,

4
merge-recursive.c
View File

@ -2069,9 +2069,9 @@ int parse_merge_opt(struct merge_options *o, const char *s)
else if (!prefixcmp(s, "subtree="))
o->subtree_shift = s + strlen("subtree=");
else if (!strcmp(s, "patience"))
o->xdl_opts |= XDF_PATIENCE_DIFF;
o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
else if (!strcmp(s, "histogram"))
o->xdl_opts |= XDF_HISTOGRAM_DIFF;
o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
else if (!strcmp(s, "ignore-space-change"))
o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
else if (!strcmp(s, "ignore-all-space"))

5
xdiff/xdiff.h
View File

@ -32,9 +32,12 @@ extern "C" {
#define XDF_IGNORE_WHITESPACE (1 << 2)
#define XDF_IGNORE_WHITESPACE_CHANGE (1 << 3)
#define XDF_IGNORE_WHITESPACE_AT_EOL (1 << 4)
#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE | XDF_IGNORE_WHITESPACE_AT_EOL)
#define XDF_PATIENCE_DIFF (1 << 5)
#define XDF_HISTOGRAM_DIFF (1 << 6)
#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE | XDF_IGNORE_WHITESPACE_AT_EOL)
#define XDF_DIFF_ALGORITHM_MASK (XDF_PATIENCE_DIFF | XDF_HISTOGRAM_DIFF)
#define XDF_DIFF_ALG(x) ((x) & XDF_DIFF_ALGORITHM_MASK)
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_COMMON (1 << 1)

4
xdiff/xdiffi.c
View File

@ -328,10 +328,10 @@ int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdalgoenv_t xenv;
diffdata_t dd1, dd2;
if (xpp->flags & XDF_PATIENCE_DIFF)
if (XDF_DIFF_ALG(xpp->flags) == XDF_PATIENCE_DIFF)
return xdl_do_patience_diff(mf1, mf2, xpp, xe);
if (xpp->flags & XDF_HISTOGRAM_DIFF)
if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
return xdl_do_histogram_diff(mf1, mf2, xpp, xe);
if (xdl_prepare_env(mf1, mf2, xpp, xe) < 0) {

2
xdiff/xhistogram.c
View File

@ -252,7 +252,7 @@ static int fall_back_to_classic_diff(struct histindex *index,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
xpp.flags = index->xpp->flags & ~XDF_HISTOGRAM_DIFF;
xpp.flags = index->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(index->env, &xpp,
line1, count1, line2, count2);

2
xdiff/xpatience.c
View File

@ -288,7 +288,7 @@ static int fall_back_to_classic_diff(struct hashmap *map,
int line1, int count1, int line2, int count2)
{
xpparam_t xpp;
xpp.flags = map->xpp->flags & ~XDF_PATIENCE_DIFF;
xpp.flags = map->xpp->flags & ~XDF_DIFF_ALGORITHM_MASK;
return xdl_fall_back_diff(map->env, &xpp,
line1, count1, line2, count2);

21
xdiff/xprepare.c
View File

@ -181,7 +181,7 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
if (!(recs = (xrecord_t **) xdl_malloc(narec * sizeof(xrecord_t *))))
goto abort;
if (xpp->flags & XDF_HISTOGRAM_DIFF)
if (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF)
hbits = hsize = 0;
else {
hbits = xdl_hashbits((unsigned int) narec);
@ -209,8 +209,8 @@ static int xdl_prepare_ctx(unsigned int pass, mmfile_t *mf, long narec, xpparam_
crec->ha = hav;
recs[nrec++] = crec;
if (!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
if ((XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
xdl_classify_record(pass, cf, rhash, hbits, crec) < 0)
goto abort;
}
}
@ -273,16 +273,15 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
* (nrecs) will be updated correctly anyway by
* xdl_prepare_ctx().
*/
sample = xpp->flags & XDF_HISTOGRAM_DIFF ? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1;
sample = (XDF_DIFF_ALG(xpp->flags) == XDF_HISTOGRAM_DIFF
? XDL_GUESS_NLINES2 : XDL_GUESS_NLINES1);
enl1 = xdl_guess_lines(mf1, sample) + 1;
enl2 = xdl_guess_lines(mf2, sample) + 1;
if (!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0) {
if (XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF &&
xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0)
return -1;
}
if (xdl_prepare_ctx(1, mf1, enl1, xpp, &cf, &xe->xdf1) < 0) {
@ -296,9 +295,9 @@ int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
return -1;
}
if (!(xpp->flags & XDF_PATIENCE_DIFF) &&
!(xpp->flags & XDF_HISTOGRAM_DIFF) &&
xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
if ((XDF_DIFF_ALG(xpp->flags) != XDF_PATIENCE_DIFF) &&
(XDF_DIFF_ALG(xpp->flags) != XDF_HISTOGRAM_DIFF) &&
xdl_optimize_ctxs(&cf, &xe->xdf1, &xe->xdf2) < 0) {
xdl_free_ctx(&xe->xdf2);
xdl_free_ctx(&xe->xdf1);