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lib/re1.5: Minor improvement in code size. 

Signed-off-by: Andrew Leech <andrew@alelec.net>
pull/8152/head
Andrew Leech 2023-06-07 10:07:14 +10:00
rodzic 5deef8005b
commit 8e354bf903
1 zmienionych plików z 11 dodań i 11 usunięć
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22
lib/re1.5/compilecode.c
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@ -10,7 +10,7 @@
#define INSERT_CODE(at, num, pc) \
((code ? memmove(code + at + num, code + at, pc - at) : 0), pc += num)
#define REL(at, to) (to - at - 2)
#define EMIT(at, byte) (code ? (code[at] = byte) : (at))
#define EMIT(at, byte) {int _at = at; code ? (code[_at] = byte) : (0);}
#define EMIT_CHECKED(at, byte) (_emit_checked(at, code, byte, &err))
#define PC (prog->bytelen)
@ -29,8 +29,9 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
int term = PC;
int alt_label = 0;
const char *re_top = re + len;
while (re < re_top && *re != ')') {
int remain;
while ((remain = re_top - re) && *re != ')') {
switch (*re) {
case '\\':
re++;
@ -80,8 +81,7 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
goto emit_char_pair;
}
}
if (!c) return NULL;
if (re_top - re > 2 && re[1] == '-' && re[2] != ']') {
if (remain > 2 && re[1] == '-' && re[2] != ']') {
re += 2;
}
emit_char_pair:
@ -94,7 +94,7 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
case '(': {
term = PC;
int sub = 0;
int capture = re_top - re > 2 && (re[1] != '?' || re[2] != ':');
int capture = remain > 2 && (re[1] != '?' || re[2] != ':');
if (capture) {
sub = ++prog->sub;
@ -107,8 +107,8 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
re++;
if (re >= re_top) return NULL; // Trailing bracket
re = _compilecode(re, re_top - re, prog, sizecode);
if (re == NULL || re >= re_top || *re != ')') return NULL; // error, or no matching paren
re = _compilecode(re, remain, prog, sizecode);
if (re == NULL || *re != ')') return NULL; // error, or no matching paren
if (capture) {
EMIT(PC++, Save);
@ -121,7 +121,7 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
case '?':
if (PC == term) return NULL; // nothing to repeat
INSERT_CODE(term, 2, PC);
if (re_top - re > 1 && re[1] == '?') {
if (remain > 1 && re[1] == '?') {
EMIT(term, RSplit);
re++;
} else {
@ -137,7 +137,7 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
EMIT(PC, Jmp);
EMIT_CHECKED(PC + 1, REL(PC, term));
PC += 2;
if (re_top - re > 1 && re[1] == '?') {
if (remain > 1 && re[1] == '?') {
EMIT(term, RSplit);
re++;
} else {
@ -149,7 +149,7 @@ static const char *_compilecode(const char *re, size_t len, ByteProg *prog, int
break;
case '+':
if (PC == term) return NULL; // nothing to repeat
if (re_top - re > 1 && re[1] == '?') {
if (remain > 1 && re[1] == '?') {
EMIT(PC, Split);
re++;
} else {