macro optimization - string constant optimisation

This commit is contained in:
bellard 2002-09-08 21:55:47 +00:00
parent ab4da04aa9
commit 8ecc9cd789

332
tcc.c
View file

@ -588,8 +588,8 @@ void vswap(void);
void vdup(void);
int get_reg(int rc);
void macro_subst(TokenString *tok_str,
Sym **nested_list, int *macro_str);
static void macro_subst(TokenString *tok_str,
Sym **nested_list, int *macro_str);
int save_reg_forced(int r);
void gen_op(int op);
void force_charshort_cast(int t);
@ -2727,7 +2727,7 @@ int *macro_arg_subst(Sym **nested_list, int *macro_str, Sym *args)
}
/* handle the '##' operator */
int *macro_twosharps(int *macro_str)
static int *macro_twosharps(void)
{
TokenSym *ts;
int *macro_ptr1;
@ -2771,164 +2771,170 @@ int *macro_twosharps(int *macro_str)
return macro_str1.str;
}
/* do macro substitution of macro_str and add result to
(tok_str,tok_len). If macro_str is NULL, then input stream token is
substituted. 'nested_list' is the list of all macros we got inside
to avoid recursing. */
void macro_subst(TokenString *tok_str,
Sym **nested_list, int *macro_str)
/* do macro substitution of current token with macro 's' and add
result to (tok_str,tok_len). 'nested_list' is the list of all
macros we got inside to avoid recursing. Return non zero if no
substitution needs to be done */
static int macro_subst_tok(TokenString *tok_str,
Sym **nested_list, Sym *s)
{
Sym *s, *args, *sa, *sa1;
int parlevel, *mstr, t, *saved_macro_ptr;
int mstr_allocated, *macro_str1;
CString cstr;
CValue cval;
Sym *args, *sa, *sa1;
int mstr_allocated, parlevel, *mstr, t;
TokenString str;
char *cstrval;
CValue cval;
CString cstr;
/* if symbol is a macro, prepare substitution */
/* if nested substitution, do nothing */
if (sym_find2(*nested_list, tok))
return -1;
/* special macros */
if (tok == TOK___LINE__) {
cval.i = file->line_num;
tok_str_add2(tok_str, TOK_CINT, &cval);
} else if (tok == TOK___FILE__) {
cstrval = file->filename;
goto add_cstr;
tok_str_add2(tok_str, TOK_STR, &cval);
} else if (tok == TOK___DATE__) {
cstrval = "Jan 1 2002";
goto add_cstr;
} else if (tok == TOK___TIME__) {
cstrval = "00:00:00";
add_cstr:
cstr_new(&cstr);
cstr_cat(&cstr, cstrval);
cstr_ccat(&cstr, '\0');
cval.cstr = &cstr;
tok_str_add2(tok_str, TOK_STR, &cval);
cstr_free(&cstr);
} else {
mstr = (int *)s->c;
mstr_allocated = 0;
if (s->t == MACRO_FUNC) {
/* NOTE: we do not use next_nomacro to avoid eating the
next token. XXX: find better solution */
if (macro_ptr) {
t = *macro_ptr;
} else {
while (is_space(ch) || ch == '\n')
cinp();
t = ch;
}
if (t != '(') /* no macro subst */
return -1;
/* argument macro */
next_nomacro();
next_nomacro();
args = NULL;
sa = s->next;
/* NOTE: empty args are allowed, except if no args */
for(;;) {
/* handle '()' case */
if (!args && tok == ')')
break;
if (!sa)
error("macro '%s' used with too many args",
get_tok_str(s->v, 0));
tok_str_new(&str);
parlevel = 0;
/* NOTE: non zero sa->t indicates VA_ARGS */
while ((parlevel > 0 ||
(tok != ')' &&
(tok != ',' || sa->t))) &&
tok != -1) {
if (tok == '(')
parlevel++;
else if (tok == ')')
parlevel--;
tok_str_add2(&str, tok, &tokc);
next_nomacro();
}
tok_str_add(&str, 0);
sym_push2(&args, sa->v & ~SYM_FIELD, sa->t, (int)str.str);
sa = sa->next;
if (tok == ')') {
/* special case for gcc var args: add an empty
var arg argument if it is omitted */
if (sa && sa->t && gnu_ext)
continue;
else
break;
}
if (tok != ',')
expect(",");
next_nomacro();
}
if (sa) {
error("macro '%s' used with too few args",
get_tok_str(s->v, 0));
}
/* now subst each arg */
mstr = macro_arg_subst(nested_list, mstr, args);
/* free memory */
sa = args;
while (sa) {
sa1 = sa->prev;
tok_str_free((int *)sa->c);
tcc_free(sa);
sa = sa1;
}
mstr_allocated = 1;
}
sym_push2(nested_list, s->v, 0, 0);
macro_subst(tok_str, nested_list, mstr);
/* pop nested defined symbol */
sa1 = *nested_list;
*nested_list = sa1->prev;
tcc_free(sa1);
if (mstr_allocated)
tok_str_free(mstr);
}
return 0;
}
/* do macro substitution of macro_str and add result to
(tok_str,tok_len). 'nested_list' is the list of all macros we got
inside to avoid recursing. */
static void macro_subst(TokenString *tok_str,
Sym **nested_list, int *macro_str)
{
Sym *s;
int *saved_macro_ptr;
int *macro_str1;
saved_macro_ptr = macro_ptr;
macro_ptr = macro_str;
macro_str1 = NULL;
if (macro_str) {
/* first scan for '##' operator handling */
macro_str1 = macro_twosharps(macro_str);
macro_ptr = macro_str1;
}
/* first scan for '##' operator handling */
macro_str1 = macro_twosharps();
macro_ptr = macro_str1;
while (1) {
next_nomacro();
if (tok == 0)
break;
if ((s = sym_find1(&define_stack, tok)) != NULL) {
/* if symbol is a macro, prepare substitution */
/* if nested substitution, do nothing */
if (sym_find2(*nested_list, tok))
s = sym_find1(&define_stack, tok);
if (s != NULL) {
if (macro_subst_tok(tok_str, nested_list, s) != 0)
goto no_subst;
/* special macros */
if (tok == TOK___LINE__) {
cval.i = file->line_num;
tok_str_add2(tok_str, TOK_CINT, &cval);
} else if (tok == TOK___FILE__) {
cstrval = file->filename;
goto add_cstr;
tok_str_add2(tok_str, TOK_STR, &cval);
} else if (tok == TOK___DATE__) {
cstrval = "Jan 1 2002";
goto add_cstr;
} else if (tok == TOK___TIME__) {
cstrval = "00:00:00";
add_cstr:
cstr_new(&cstr);
cstr_cat(&cstr, cstrval);
cstr_ccat(&cstr, '\0');
cval.cstr = &cstr;
tok_str_add2(tok_str, TOK_STR, &cval);
cstr_free(&cstr);
} else {
mstr = (int *)s->c;
mstr_allocated = 0;
if (s->t == MACRO_FUNC) {
/* NOTE: we do not use next_nomacro to avoid eating the
next token. XXX: find better solution */
if (macro_ptr) {
t = *macro_ptr;
} else {
while (is_space(ch) || ch == '\n')
cinp();
t = ch;
}
if (t != '(') /* no macro subst */
goto no_subst;
/* argument macro */
next_nomacro();
next_nomacro();
args = NULL;
sa = s->next;
/* NOTE: empty args are allowed, except if no args */
for(;;) {
/* handle '()' case */
if (!args && tok == ')')
break;
if (!sa)
error("macro '%s' used with too many args",
get_tok_str(s->v, 0));
tok_str_new(&str);
parlevel = 0;
/* NOTE: non zero sa->t indicates VA_ARGS */
while ((parlevel > 0 ||
(tok != ')' &&
(tok != ',' || sa->t))) &&
tok != -1) {
if (tok == '(')
parlevel++;
else if (tok == ')')
parlevel--;
tok_str_add2(&str, tok, &tokc);
next_nomacro();
}
tok_str_add(&str, 0);
sym_push2(&args, sa->v & ~SYM_FIELD, sa->t, (int)str.str);
sa = sa->next;
if (tok == ')') {
/* special case for gcc var args: add an empty
var arg argument if it is omitted */
if (sa && sa->t && gnu_ext)
continue;
else
break;
}
if (tok != ',')
expect(",");
next_nomacro();
}
if (sa) {
error("macro '%s' used with too few args",
get_tok_str(s->v, 0));
}
/* now subst each arg */
mstr = macro_arg_subst(nested_list, mstr, args);
/* free memory */
sa = args;
while (sa) {
sa1 = sa->prev;
tok_str_free((int *)sa->c);
tcc_free(sa);
sa = sa1;
}
mstr_allocated = 1;
}
sym_push2(nested_list, s->v, 0, 0);
macro_subst(tok_str, nested_list, mstr);
/* pop nested defined symbol */
sa1 = *nested_list;
*nested_list = sa1->prev;
tcc_free(sa1);
if (mstr_allocated)
tok_str_free(mstr);
}
} else {
no_subst:
/* no need to add if reading input stream */
if (!macro_str)
return;
tok_str_add2(tok_str, tok, &tokc);
}
/* only replace one macro while parsing input stream */
if (!macro_str)
return;
}
macro_ptr = saved_macro_ptr;
if (macro_str1)
tok_str_free(macro_str1);
tok_str_free(macro_str1);
}
/* return next token with macro substitution */
void next(void)
{
Sym *nested_list;
Sym *nested_list, *s;
TokenString str;
/* special 'ungettok' case for label parsing */
@ -2938,23 +2944,26 @@ void next(void)
tok1 = 0;
} else {
redo:
next_nomacro();
if (!macro_ptr) {
/* if not reading from macro substituted string, then try
to substitute */
/* XXX: optimize non macro case */
tok_str_new(&str);
nested_list = NULL;
macro_subst(&str, &nested_list, NULL);
if (str.str) {
tok_str_add(&str, 0);
macro_ptr = str.str;
macro_ptr_allocated = str.str;
goto redo;
to substitute macros */
if (tok >= TOK_IDENT) {
s = sym_find1(&define_stack, tok);
if (s) {
/* we have a macro: we try to substitute */
tok_str_new(&str);
nested_list = NULL;
if (macro_subst_tok(&str, &nested_list, s) == 0) {
/* substitution done, NOTE: maybe empty */
tok_str_add(&str, 0);
macro_ptr = str.str;
macro_ptr_allocated = str.str;
goto redo;
}
}
}
if (tok == 0)
goto redo;
} else {
next_nomacro();
if (tok == 0) {
/* end of macro string: free it */
tok_str_free(macro_ptr_allocated);
@ -6226,13 +6235,20 @@ static void decl_initializer(int t, Section *sec, unsigned long c,
if (!size_only) {
if (cstr_len > nb)
warning("initializer-string for array is too long");
for(i=0;i<nb;i++) {
if (tok == TOK_STR)
ch = ((unsigned char *)cstr->data)[i];
else
ch = ((int *)cstr->data)[i];
init_putv(t1, sec, c + (array_length + i) * size1,
ch, EXPR_VAL);
/* in order to go faster for common case (char
string in global variable, we handle it
specifically */
if (sec && tok == TOK_STR && size1 == 1) {
memcpy(sec->data + c + array_length, cstr->data, nb);
} else {
for(i=0;i<nb;i++) {
if (tok == TOK_STR)
ch = ((unsigned char *)cstr->data)[i];
else
ch = ((int *)cstr->data)[i];
init_putv(t1, sec, c + (array_length + i) * size1,
ch, EXPR_VAL);
}
}
}
array_length += nb;