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pike.c: updated codebase

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This commit is contained in:
Kyryl Melekhin
2025-11-01 18:30:11 +00:00
parent 2b7c8eb846
commit cad0f12966
2 changed files with 113 additions and 109 deletions
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212
pike.c
View File

@@ -1,6 +1,6 @@
/*
Copyright 2007-2009 Russ Cox. All Rights Reserved.
Copyright 2020-2021 Kyryl Melekhin. All Rights Reserved.
Copyright 2020-2025 Kyryl Melekhin. All Rights Reserved.
Use of this source code is governed by a BSD-style
*/
@@ -8,6 +8,9 @@ Use of this source code is governed by a BSD-style
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#define MAX(a, b) ((a) < (b) ? (b) : (a))
unsigned char utf8_length[256] = {
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
@@ -30,16 +33,17 @@ unsigned char utf8_length[256] = {
};
/* return the length of a utf-8 character */
#define uc_len(dst, s) dst = utf8_length[(unsigned char)s[0]];
#define uc_len(s) utf8_length[(unsigned char)s[0]]
/* the unicode codepoint of the given utf-8 character */
#define uc_code(dst, s) \
#define uc_code(dst, s, l) \
dst = (unsigned char)s[0]; \
if (dst < 192){} \
else if (dst < 224) \
l = utf8_length[dst]; \
if (l == 1); \
else if (l == 2) \
dst = ((dst & 0x1f) << 6) | (s[1] & 0x3f); \
else if (dst < 240) \
else if (l == 3) \
dst = ((dst & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f); \
else if (dst < 248) \
else if (l == 4) \
dst = ((dst & 0x07) << 18) | ((s[1] & 0x3f) << 12) | \
((s[2] & 0x3f) << 6) | (s[3] & 0x3f); \
else \
@@ -106,18 +110,6 @@ pc += num;
#define EMIT(at, byte) (code ? (code[at] = byte) : at)
#define PC (prog->unilen)
static int re_classmatch(const int *pc, int c)
{
/* pc points to "classnot" byte after opcode */
int is_positive = *pc++;
int cnt = *pc++;
while (cnt--) {
if (c >= *pc && c <= pc[1]) return is_positive;
pc += 2;
}
return !is_positive;
}
void re_dumpcode(rcode *prog)
{
int pc = 0, i = 0;
@@ -177,12 +169,12 @@ void re_dumpcode(rcode *prog)
prog->unilen, prog->len, prog->splits, i);
}
static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
static int compilecode(const char *re_loc, rcode *prog, int sizecode)
{
const char *re = re_loc;
int *code = sizecode ? NULL : prog->insts;
int start = PC, term = PC;
int alt_label = 0, c;
int alt_label = 0, c, l, cnt;
int alt_stack[4096], altc = 0;
int cap_stack[4096 * 5], capc = 0;
@@ -190,10 +182,9 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
switch (*re) {
case '\\':
re++;
if (!*re) return -1; /* Trailing backslash */
if (!*re)
return -1; /* Trailing backslash */
if (*re == '<' || *re == '>') {
if (re - re_loc > 2 && re[-2] == '\\')
break;
EMIT(PC++, *re == '<' ? WBEG : WEND);
term = PC;
break;
@@ -201,14 +192,14 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
default:
term = PC;
EMIT(PC++, CHAR);
uc_code(c, re) EMIT(PC++, c);
uc_code(c, re, l)
EMIT(PC++, c);
break;
case '.':
term = PC;
EMIT(PC++, ANY);
break;
case '[':;
int cnt;
term = PC;
re++;
EMIT(PC++, CLASS);
@@ -217,36 +208,39 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
re++;
} else
EMIT(PC++, 1);
PC++; /* Skip "# of pairs" byte */
PC++;
for (cnt = 0; *re != ']'; cnt++) {
if (*re == '\\') re++;
if (!*re) return -1;
uc_code(c, re) EMIT(PC++, c);
uc_len(c, re)
if (re[c] == '-' && re[c+1] != ']')
re += c+1;
uc_code(c, re) EMIT(PC++, c);
uc_len(c, re) re += c;
if (*re == '\\')
re++;
uc_code(c, re, l)
EMIT(PC++, c);
if (re[l] == '-' && re[l+1] != ']') {
re += l + 1 + (re[l+1] == '\\');
uc_code(c, re, l)
}
EMIT(PC++, c);
if (!l)
return -1;
re += l;
}
EMIT(term + 2, cnt);
break;
case '(':;
term = PC;
int sub;
int capture = 1;
if (*(re+1) == '?') {
if (re[1] == '?') {
re += 2;
if (*re == ':')
capture = 0;
else
if (*re == ':') {
cap_stack[capc++] = 0;
goto non_capture;
} else
return -1;
}
if (capture) {
sub = ++prog->sub;
EMIT(PC++, SAVE);
EMIT(PC++, sub);
}
cap_stack[capc++] = capture;
cap_stack[capc++] = 1;
non_capture:
cap_stack[capc++] = term;
cap_stack[capc++] = alt_label;
cap_stack[capc++] = start;
@@ -255,7 +249,8 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
start = PC;
break;
case ')':
if (--capc-4 < 0) return -1;
if (--capc-4 < 0)
return -1;
if (code && alt_label) {
EMIT(alt_label, REL(alt_label, PC) + 1);
int _altc = cap_stack[capc];
@@ -303,7 +298,8 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
}
break;
case '?':
if (PC == term) return -1;
if (PC == term)
return -1;
INSERT_CODE(term, 2, PC);
if (re[1] == '?') {
EMIT(term, RSPLIT);
@@ -314,7 +310,8 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
term = PC;
break;
case '*':
if (PC == term) return -1;
if (PC == term)
return -1;
INSERT_CODE(term, 2, PC);
EMIT(PC, JMP);
EMIT(PC + 1, REL(PC, term));
@@ -328,7 +325,8 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
term = PC;
break;
case '+':
if (PC == term) return -1;
if (PC == term)
return -1;
if (re[1] == '?') {
EMIT(PC, SPLIT);
re++;
@@ -357,7 +355,7 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
term = PC;
break;
}
uc_len(c, re) re += c;
re += uc_len(re);
}
if (code && alt_label) {
EMIT(alt_label, REL(alt_label, PC) + 1);
@@ -369,28 +367,25 @@ static int _compilecode(const char *re_loc, rcode *prog, int sizecode)
return capc ? -1 : 0;
}
int re_sizecode(const char *re, int *nsub)
static int re_sizecode(const char *re, int *nsub)
{
rcode dummyprog;
dummyprog.unilen = 3;
dummyprog.unilen = 4;
dummyprog.sub = 0;
int res = _compilecode(re, &dummyprog, 1);
if (res < 0) return res;
int res = compilecode(re, &dummyprog, 1);
*nsub = dummyprog.sub;
return dummyprog.unilen;
return res < 0 ? res : dummyprog.unilen;
}
int re_comp(rcode *prog, const char *re, int nsubs)
static int reg_comp(rcode *prog, const char *re, int nsubs)
{
prog->len = 0;
prog->unilen = 0;
prog->sub = 0;
prog->presub = nsubs;
prog->splits = 0;
int res = _compilecode(re, prog, 0);
if (res < 0) return res;
if (compilecode(re, prog, 0) < 0)
return -1;
int icnt = 0, scnt = SPLIT;
for (int i = 0; i < prog->unilen; i++)
switch (prog->insts[i]) {
@@ -416,20 +411,30 @@ int re_comp(rcode *prog, const char *re, int nsubs)
prog->insts[prog->unilen++] = SAVE;
prog->insts[prog->unilen++] = prog->sub + 1;
prog->insts[prog->unilen++] = MATCH;
prog->splits = (scnt - SPLIT) / 2;
prog->len = icnt + 2;
prog->splits = MAX((scnt - SPLIT) / 2, 1);
prog->len = icnt + 3;
prog->presub = sizeof(rsub) + (sizeof(char*) * (nsubs + 1) * 2);
prog->sub = prog->presub * (prog->len - prog->splits + 3);
prog->sub = prog->presub * (icnt + 6);
prog->sparsesz = scnt;
return 0;
}
#define newsub(init, copy) \
if (freesub) \
{ s1 = freesub; freesub = s1->freesub; copy } \
else \
{ if (suboff == prog->sub) suboff = 0; \
s1 = (rsub*)&nsubs[suboff]; suboff += rsubsize; init } \
if (freesub) { \
sub = freesub; freesub = sub->freesub; copy \
} else { \
if (suboff == prog->sub) \
suboff = 0; \
sub = (rsub*)&nsubs[suboff]; \
suboff += rsubsize; init \
} \
#define onlist(nn) \
if (sdense[spc] < sparsesz) \
if (sdense[sdense[spc] << 1] == (unsigned int)spc) \
deccheck(nn) \
sdense[spc] = sparsesz; \
sdense[sparsesz++ << 1] = spc; \
#define decref(csub) \
if (--csub->ref == 0) { \
@@ -446,13 +451,6 @@ if (si) { \
#define deccheck(nn) { decref(nsub) rec_check(nn) continue; } \
#define onlist(nn) \
if (sdense[spc] < sparsesz) \
if (sdense[sdense[spc] * 2] == (unsigned int)spc) \
deccheck(nn) \
sdense[spc] = sparsesz; \
sdense[sparsesz++ * 2] = spc; \
#define fastrec(nn, list, listidx) \
nsub->ref++; \
spc = *npc; \
@@ -466,20 +464,20 @@ subs[si++] = nsub; \
goto next##nn; \
#define saveclist() \
if (npc[1] > nsubp / 2 && nsub->ref > 1) { \
if (npc[1] > (nsubp >> 1) && nsub->ref > 1) { \
nsub->ref--; \
newsub(memcpy(s1->sub, nsub->sub, osubp);, \
memcpy(s1->sub, nsub->sub, osubp / 2);) \
nsub = s1; \
newsub(memcpy(sub->sub, nsub->sub, osubp);, \
memcpy(sub->sub, nsub->sub, osubp >> 1);) \
nsub = sub; \
nsub->ref = 1; \
} \
#define savenlist() \
if (nsub->ref > 1) { \
nsub->ref--; \
newsub(/*nop*/, /*nop*/) \
memcpy(s1->sub, nsub->sub, osubp); \
nsub = s1; \
newsub(,) \
memcpy(sub->sub, nsub->sub, osubp); \
nsub = sub; \
nsub->ref = 1; \
} \
@@ -513,8 +511,7 @@ if (spc > JMP) { \
} else if (spc == SAVE) { \
save##list() \
nsub->sub[npc[1]] = _sp; \
npc += 2; \
goto rec##nn; \
npc += 2; goto rec##nn; \
} else if (spc == WBEG) { \
if (((sp != s || sp != _sp) && isword(sp)) \
|| !isword(_sp)) \
@@ -555,23 +552,24 @@ clistidx = nlistidx; \
#define deccont() { decref(nsub) continue; }
int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
static int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
{
int rsubsize = prog->presub, suboff = 0;
int spc, i, j, c, *npc, osubp = nsubp * sizeof(char*);
int si = 0, clistidx = 0, nlistidx, mcont = MATCH;
if (!*s)
return 0;
const char *sp = s, *_sp = s;
int *insts = prog->insts;
int *pcs[prog->splits];
int *pcs[prog->splits], *npc, *pc, *insts = prog->insts;
rsub *subs[prog->splits];
unsigned int sdense[prog->sparsesz], sparsesz = 0;
rsub *nsub, *s1, *matched = NULL, *freesub = NULL;
rsub *nsub, *sub, *matched = NULL, *freesub = NULL;
rthread _clist[prog->len], _nlist[prog->len];
rthread *clist = _clist, *nlist = _nlist, *tmp;
int rsubsize = prog->presub, suboff = 0;
int cnt, spc, i, c, osubp = nsubp * sizeof(char*);
int si = 0, clistidx = 0, nlistidx, mcont = MATCH;
unsigned int sdense[prog->sparsesz], sparsesz = 0;
char nsubs[prog->sub];
goto jmp_start;
for (;; sp = _sp) {
uc_len(i, sp) uc_code(c, sp)
uc_code(c, sp, i)
_sp = sp+i;
nlistidx = 0; sparsesz = 0;
for (i = 0; i < clistidx; i++) {
@@ -579,13 +577,20 @@ int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
nsub = clist[i].sub;
spc = *npc;
if (spc == CHAR) {
if (c != *(npc+1))
if (c != npc[1])
deccont()
npc += 2;
} else if (spc == CLASS) {
if (!re_classmatch(npc+1, c))
pc = npc+1;
cnt = pc[1];
for (; cnt > 0; cnt--) {
pc += 2;
if (c >= *pc && c <= pc[1])
cnt = -1;
}
if ((!cnt && npc[1]) || (cnt < 0 && !npc[1]))
deccont()
npc += *(npc+2) * 2 + 3;
npc += npc[2] * 2 + 3;
} else if (spc == MATCH) {
matched:
nlist[nlistidx++].pc = &mcont;
@@ -595,9 +600,9 @@ int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
matched = nsub;
}
if (sp == _sp || nlistidx == 1) {
for (i = 0, j = i; i < nsubp; i+=2, j++) {
subp[i] = matched->sub[j];
subp[i+1] = matched->sub[nsubp / 2 + j];
for (i = 0; i < nsubp; i+=2) {
subp[i] = matched->sub[i >> 1];
subp[i+1] = matched->sub[(nsubp >> 1) + (i >> 1)];
}
return 1;
}
@@ -611,10 +616,10 @@ int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
break;
swaplist()
jmp_start:
newsub(memset(s1->sub, 0, osubp);, /*nop*/)
s1->ref = 1;
s1->sub[0] = _sp;
nsub = s1; npc = insts;
newsub(memset(sub->sub, 0, osubp);,)
sub->ref = 1;
sub->sub[0] = _sp;
nsub = sub; npc = insts;
addthread(1, clist, clistidx)
_continue:;
}
@@ -636,12 +641,11 @@ int main(int argc, char *argv[])
}
char code[sizeof(rcode)+sz];
rcode *_code = (rcode*)code;
if (re_comp(_code, argv[1], sub_els)) {
printf("Error in re_comp\n");
if (reg_comp(_code, argv[1], sub_els)) {
printf("Error in reg_comp\n");
return 1;
}
re_dumpcode(_code);
#include <time.h>
if (argc > 2) {
sub_els = (sub_els + 1) * 2;
const char *sub[sub_els];

2
test.sh
View File

@@ -581,7 +581,7 @@ expect="\
(0,10)(0,10)(0,10)(?,?)
(0,0)(0,0)(0,0)(?,?)
(0,20)(0,20)(0,20)(?,?)
(0,0)
-nomatch-
"
if [ ! -f ./a.out ]; then