shenleiandClaude Opus 5
5fad769ee8
The embedded 40250 script layer needs its own interpreter on five platforms. 2.7 is end-of-life, so nothing can be fetched from the target SDKs and the source is vendored (official 2.7.18 tarball, trimmed to 25MB; Lib/ stays for step 3's python27.zip). cpython-2.7.18/CMakeLists.txt builds one `mtpython` static library from exactly the 133 objects the reference libpython2.7.a contains, off by default behind -DMTGODOT_EMBED_PYTHON=ON. The source list and the built-in module table (config/config.c, 39 entries) are shared; pyconfig.h is a probe result and is not, so each platform keeps its own under config/<platform>/, regenerated by tools/py_embed/gen_pyconfig.sh and checked against the shared table. Three vendor patches, documented in docs/THIRD-PARTY.md: configure/configure.ac learn arm64 on macOS, and posixmodule.c undefines the process-control calls it hard-defines past pyconfig.h when building for iOS. macOS (ctest python.embed: every builtin imports, codecs and pickle work off the vendored Lib/), Android arm64 and iOS arm64 build. Linux needs a Linux host and Windows needs a MinGW-vs-MSVC decision; both are noted for step 4. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
|
|
/* Computation of FIRST stets */
|
|
|
|
#include "pgenheaders.h"
|
|
#include "grammar.h"
|
|
#include "token.h"
|
|
|
|
extern int Py_DebugFlag;
|
|
|
|
/* Forward */
|
|
static void calcfirstset(grammar *, dfa *);
|
|
|
|
void
|
|
addfirstsets(grammar *g)
|
|
{
|
|
int i;
|
|
dfa *d;
|
|
|
|
if (Py_DebugFlag)
|
|
printf("Adding FIRST sets ...\n");
|
|
for (i = 0; i < g->g_ndfas; i++) {
|
|
d = &g->g_dfa[i];
|
|
if (d->d_first == NULL)
|
|
calcfirstset(g, d);
|
|
}
|
|
}
|
|
|
|
static void
|
|
calcfirstset(grammar *g, dfa *d)
|
|
{
|
|
int i, j;
|
|
state *s;
|
|
arc *a;
|
|
int nsyms;
|
|
int *sym;
|
|
int nbits;
|
|
static bitset dummy;
|
|
bitset result;
|
|
int type;
|
|
dfa *d1;
|
|
label *l0;
|
|
|
|
if (Py_DebugFlag)
|
|
printf("Calculate FIRST set for '%s'\n", d->d_name);
|
|
|
|
if (dummy == NULL)
|
|
dummy = newbitset(1);
|
|
if (d->d_first == dummy) {
|
|
fprintf(stderr, "Left-recursion for '%s'\n", d->d_name);
|
|
return;
|
|
}
|
|
if (d->d_first != NULL) {
|
|
fprintf(stderr, "Re-calculating FIRST set for '%s' ???\n",
|
|
d->d_name);
|
|
}
|
|
d->d_first = dummy;
|
|
|
|
l0 = g->g_ll.ll_label;
|
|
nbits = g->g_ll.ll_nlabels;
|
|
result = newbitset(nbits);
|
|
|
|
sym = (int *)PyObject_MALLOC(sizeof(int));
|
|
if (sym == NULL)
|
|
Py_FatalError("no mem for new sym in calcfirstset");
|
|
nsyms = 1;
|
|
sym[0] = findlabel(&g->g_ll, d->d_type, (char *)NULL);
|
|
|
|
s = &d->d_state[d->d_initial];
|
|
for (i = 0; i < s->s_narcs; i++) {
|
|
a = &s->s_arc[i];
|
|
for (j = 0; j < nsyms; j++) {
|
|
if (sym[j] == a->a_lbl)
|
|
break;
|
|
}
|
|
if (j >= nsyms) { /* New label */
|
|
sym = (int *)PyObject_REALLOC(sym,
|
|
sizeof(int) * (nsyms + 1));
|
|
if (sym == NULL)
|
|
Py_FatalError(
|
|
"no mem to resize sym in calcfirstset");
|
|
sym[nsyms++] = a->a_lbl;
|
|
type = l0[a->a_lbl].lb_type;
|
|
if (ISNONTERMINAL(type)) {
|
|
d1 = PyGrammar_FindDFA(g, type);
|
|
if (d1->d_first == dummy) {
|
|
fprintf(stderr,
|
|
"Left-recursion below '%s'\n",
|
|
d->d_name);
|
|
}
|
|
else {
|
|
if (d1->d_first == NULL)
|
|
calcfirstset(g, d1);
|
|
mergebitset(result,
|
|
d1->d_first, nbits);
|
|
}
|
|
}
|
|
else if (ISTERMINAL(type)) {
|
|
addbit(result, a->a_lbl);
|
|
}
|
|
}
|
|
}
|
|
d->d_first = result;
|
|
if (Py_DebugFlag) {
|
|
printf("FIRST set for '%s': {", d->d_name);
|
|
for (i = 0; i < nbits; i++) {
|
|
if (testbit(result, i))
|
|
printf(" %s", PyGrammar_LabelRepr(&l0[i]));
|
|
}
|
|
printf(" }\n");
|
|
}
|
|
|
|
PyObject_FREE(sym);
|
|
}
|