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ftepp.c
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ftepp.c
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/*
* Copyright (C) 2012, 2013, 2014
* Wolfgang Bumiller
* Dale Weiler
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "gmqcc.h"
#include "lexer.h"
#define HT_MACROS 1024
typedef struct {
bool on;
bool was_on;
bool had_else;
} ppcondition;
typedef struct {
int token;
char *value;
/* a copy from the lexer */
union {
vec3_t v;
int i;
double f;
int t; /* type */
} constval;
} pptoken;
typedef struct {
lex_ctx_t ctx;
char *name;
char **params;
/* yes we need an extra flag since `#define FOO x` is not the same as `#define FOO() x` */
bool has_params;
bool variadic;
pptoken **output;
} ppmacro;
typedef struct ftepp_s {
lex_file *lex;
int token;
unsigned int errors;
bool output_on;
ppcondition *conditions;
/*ppmacro **macros;*/
ht macros; /* hashtable<string, ppmacro*> */
char *output_string;
char *itemname;
char *includename;
bool in_macro;
uint32_t predef_countval;
uint32_t predef_randval;
} ftepp_t;
/* __DATE__ */
static char *ftepp_predef_date(ftepp_t *context) {
const struct tm *itime = NULL;
char *value = (char*)mem_a(82);
time_t rtime;
(void)context;
time (&rtime);
itime = util_localtime(&rtime);
strftime(value, 82, "\"%b %d %Y\"", itime);
return value;
}
/* __TIME__ */
static char *ftepp_predef_time(ftepp_t *context) {
const struct tm *itime = NULL;
char *value = (char*)mem_a(82);
time_t rtime;
(void)context;
time (&rtime);
itime = util_localtime(&rtime);
strftime(value, 82, "\"%X\"", itime);
return value;
}
/* __LINE__ */
static char *ftepp_predef_line(ftepp_t *context) {
char *value;
util_asprintf(&value, "%d", (int)context->lex->line);
return value;
}
/* __FILE__ */
static char *ftepp_predef_file(ftepp_t *context) {
size_t length = strlen(context->lex->name) + 3; /* two quotes and a terminator */
char *value = (char*)mem_a(length);
util_snprintf(value, length, "\"%s\"", context->lex->name);
return value;
}
/* __COUNTER_LAST__ */
static char *ftepp_predef_counterlast(ftepp_t *context) {
char *value;
util_asprintf(&value, "%u", context->predef_countval);
return value;
}
/* __COUNTER__ */
static char *ftepp_predef_counter(ftepp_t *context) {
char *value;
context->predef_countval ++;
util_asprintf(&value, "%u", context->predef_countval);
return value;
}
/* __RANDOM__ */
static char *ftepp_predef_random(ftepp_t *context) {
char *value;
context->predef_randval = (util_rand() % 0xFF) + 1;
util_asprintf(&value, "%u", context->predef_randval);
return value;
}
/* __RANDOM_LAST__ */
static char *ftepp_predef_randomlast(ftepp_t *context) {
char *value;
util_asprintf(&value, "%u", context->predef_randval);
return value;
}
/* __TIMESTAMP__ */
static char *ftepp_predef_timestamp(ftepp_t *context) {
struct stat finfo;
const char *find;
char *value;
size_t size;
if (stat(context->lex->name, &finfo))
return util_strdup("\"<failed to determine timestamp>\"");
find = util_ctime(&finfo.st_mtime);
value = (char*)mem_a(strlen(find) + 1);
memcpy(&value[1], find, (size = strlen(find)) - 1);
value[0] = '"';
value[size] = '"';
return value;
}
typedef struct {
const char *name;
char *(*func)(ftepp_t *);
} ftepp_predef_t;
static const ftepp_predef_t ftepp_predefs[] = {
{ "__LINE__", &ftepp_predef_line },
{ "__FILE__", &ftepp_predef_file },
{ "__COUNTER__", &ftepp_predef_counter },
{ "__COUNTER_LAST__", &ftepp_predef_counterlast },
{ "__RANDOM__", &ftepp_predef_random },
{ "__RANDOM_LAST__", &ftepp_predef_randomlast },
{ "__DATE__", &ftepp_predef_date },
{ "__TIME__", &ftepp_predef_time },
{ "__TIME_STAMP__", &ftepp_predef_timestamp }
};
static GMQCC_INLINE size_t ftepp_predef_index(const char *name) {
/* no hashtable here, we simply check for one to exist the naive way */
size_t i;
for(i = 1; i < GMQCC_ARRAY_COUNT(ftepp_predefs) + 1; i++)
if (!strcmp(ftepp_predefs[i-1].name, name))
return i;
return 0;
}
bool ftepp_predef_exists(const char *name);
bool ftepp_predef_exists(const char *name) {
return ftepp_predef_index(name) != 0;
}
/* singleton because we're allowed */
static GMQCC_INLINE char *(*ftepp_predef(const char *name))(ftepp_t *context) {
size_t i = ftepp_predef_index(name);
return (i != 0) ? ftepp_predefs[i-1].func : NULL;
}
#define ftepp_tokval(f) ((f)->lex->tok.value)
#define ftepp_ctx(f) ((f)->lex->tok.ctx)
static void ftepp_errorat(ftepp_t *ftepp, lex_ctx_t ctx, const char *fmt, ...)
{
va_list ap;
ftepp->errors++;
va_start(ap, fmt);
con_cvprintmsg(ctx, LVL_ERROR, "error", fmt, ap);
va_end(ap);
}
static void ftepp_error(ftepp_t *ftepp, const char *fmt, ...)
{
va_list ap;
ftepp->errors++;
va_start(ap, fmt);
con_cvprintmsg(ftepp->lex->tok.ctx, LVL_ERROR, "error", fmt, ap);
va_end(ap);
}
static bool GMQCC_WARN ftepp_warn(ftepp_t *ftepp, int warntype, const char *fmt, ...)
{
bool r;
va_list ap;
va_start(ap, fmt);
r = vcompile_warning(ftepp->lex->tok.ctx, warntype, fmt, ap);
va_end(ap);
return r;
}
static pptoken *pptoken_make(ftepp_t *ftepp)
{
pptoken *token = (pptoken*)mem_a(sizeof(pptoken));
token->token = ftepp->token;
#if 0
if (token->token == TOKEN_WHITE)
token->value = util_strdup(" ");
else
#else
token->value = util_strdup(ftepp_tokval(ftepp));
#endif
memcpy(&token->constval, &ftepp->lex->tok.constval, sizeof(token->constval));
return token;
}
static GMQCC_INLINE void pptoken_delete(pptoken *self)
{
mem_d(self->value);
mem_d(self);
}
static ppmacro *ppmacro_new(lex_ctx_t ctx, const char *name)
{
ppmacro *macro = (ppmacro*)mem_a(sizeof(ppmacro));
(void)ctx;
memset(macro, 0, sizeof(*macro));
macro->name = util_strdup(name);
return macro;
}
static void ppmacro_delete(ppmacro *self)
{
size_t i;
for (i = 0; i < vec_size(self->params); ++i)
mem_d(self->params[i]);
vec_free(self->params);
for (i = 0; i < vec_size(self->output); ++i)
pptoken_delete(self->output[i]);
vec_free(self->output);
mem_d(self->name);
mem_d(self);
}
static ftepp_t* ftepp_new(void)
{
ftepp_t *ftepp;
ftepp = (ftepp_t*)mem_a(sizeof(*ftepp));
memset(ftepp, 0, sizeof(*ftepp));
ftepp->macros = util_htnew(HT_MACROS);
ftepp->output_on = true;
ftepp->predef_countval = 0;
ftepp->predef_randval = 0;
return ftepp;
}
static GMQCC_INLINE void ftepp_flush_do(ftepp_t *self)
{
vec_free(self->output_string);
}
static void ftepp_delete(ftepp_t *self)
{
ftepp_flush_do(self);
if (self->itemname)
mem_d(self->itemname);
if (self->includename)
vec_free(self->includename);
util_htrem(self->macros, (void (*)(void*))&ppmacro_delete);
vec_free(self->conditions);
if (self->lex)
lex_close(self->lex);
mem_d(self);
}
static void ftepp_out(ftepp_t *ftepp, const char *str, bool ignore_cond)
{
if (ignore_cond || ftepp->output_on)
{
size_t len;
char *data;
len = strlen(str);
data = vec_add(ftepp->output_string, len);
memcpy(data, str, len);
}
}
static GMQCC_INLINE void ftepp_update_output_condition(ftepp_t *ftepp)
{
size_t i;
ftepp->output_on = true;
for (i = 0; i < vec_size(ftepp->conditions); ++i)
ftepp->output_on = ftepp->output_on && ftepp->conditions[i].on;
}
static GMQCC_INLINE ppmacro* ftepp_macro_find(ftepp_t *ftepp, const char *name)
{
return (ppmacro*)util_htget(ftepp->macros, name);
}
static GMQCC_INLINE void ftepp_macro_delete(ftepp_t *ftepp, const char *name)
{
util_htrm(ftepp->macros, name, (void (*)(void*))&ppmacro_delete);
}
static GMQCC_INLINE int ftepp_next(ftepp_t *ftepp)
{
return (ftepp->token = lex_do(ftepp->lex));
}
/* Important: this does not skip newlines! */
static bool ftepp_skipspace(ftepp_t *ftepp)
{
if (ftepp->token != TOKEN_WHITE)
return true;
while (ftepp_next(ftepp) == TOKEN_WHITE) {}
if (ftepp->token >= TOKEN_EOF) {
ftepp_error(ftepp, "unexpected end of preprocessor directive");
return false;
}
return true;
}
/* this one skips EOLs as well */
static bool ftepp_skipallwhite(ftepp_t *ftepp)
{
if (ftepp->token != TOKEN_WHITE && ftepp->token != TOKEN_EOL)
return true;
do {
ftepp_next(ftepp);
} while (ftepp->token == TOKEN_WHITE || ftepp->token == TOKEN_EOL);
if (ftepp->token >= TOKEN_EOF) {
ftepp_error(ftepp, "unexpected end of preprocessor directive");
return false;
}
return true;
}
/**
* The huge macro parsing code...
*/
static bool ftepp_define_params(ftepp_t *ftepp, ppmacro *macro)
{
do {
ftepp_next(ftepp);
if (!ftepp_skipspace(ftepp))
return false;
if (ftepp->token == ')')
break;
switch (ftepp->token) {
case TOKEN_IDENT:
case TOKEN_TYPENAME:
case TOKEN_KEYWORD:
vec_push(macro->params, util_strdup(ftepp_tokval(ftepp)));
break;
case TOKEN_DOTS:
macro->variadic = true;
break;
default:
ftepp_error(ftepp, "unexpected token in parameter list");
return false;
}
ftepp_next(ftepp);
if (!ftepp_skipspace(ftepp))
return false;
if (macro->variadic && ftepp->token != ')') {
ftepp_error(ftepp, "cannot have parameters after the variadic parameters");
return false;
}
} while (ftepp->token == ',');
if (ftepp->token != ')') {
ftepp_error(ftepp, "expected closing paren after macro parameter list");
return false;
}
ftepp_next(ftepp);
/* skipspace happens in ftepp_define */
return true;
}
static bool ftepp_define_body(ftepp_t *ftepp, ppmacro *macro)
{
pptoken *ptok;
while (ftepp->token != TOKEN_EOL && ftepp->token < TOKEN_EOF) {
bool subscript = false;
size_t index = 0;
if (macro->variadic && !strcmp(ftepp_tokval(ftepp), "__VA_ARGS__")) {
subscript = !!(ftepp_next(ftepp) == '#');
if (subscript && ftepp_next(ftepp) != '#') {
ftepp_error(ftepp, "expected `##` in __VA_ARGS__ for subscripting");
return false;
} else if (subscript) {
if (ftepp_next(ftepp) == '[') {
if (ftepp_next(ftepp) != TOKEN_INTCONST) {
ftepp_error(ftepp, "expected index for __VA_ARGS__ subscript");
return false;
}
index = (int)strtol(ftepp_tokval(ftepp), NULL, 10);
if (ftepp_next(ftepp) != ']') {
ftepp_error(ftepp, "expected `]` in __VA_ARGS__ subscript");
return false;
}
/*
* mark it as an array to be handled later as such and not
* as traditional __VA_ARGS__
*/
ftepp->token = TOKEN_VA_ARGS_ARRAY;
ptok = pptoken_make(ftepp);
ptok->constval.i = index;
vec_push(macro->output, ptok);
ftepp_next(ftepp);
} else {
ftepp_error(ftepp, "expected `[` for subscripting of __VA_ARGS__");
return false;
}
} else {
int old = ftepp->token;
ftepp->token = TOKEN_VA_ARGS;
ptok = pptoken_make(ftepp);
vec_push(macro->output, ptok);
ftepp->token = old;
}
}
else if (macro->variadic && !strcmp(ftepp_tokval(ftepp), "__VA_COUNT__")) {
ftepp->token = TOKEN_VA_COUNT;
ptok = pptoken_make(ftepp);
vec_push(macro->output, ptok);
ftepp_next(ftepp);
} else {
ptok = pptoken_make(ftepp);
vec_push(macro->output, ptok);
ftepp_next(ftepp);
}
}
/* recursive expansion can cause EOFs here */
if (ftepp->token != TOKEN_EOL && ftepp->token != TOKEN_EOF) {
ftepp_error(ftepp, "unexpected junk after macro or unexpected end of file");
return false;
}
return true;
}
static const char *ftepp_math_constants[][2] = {
{ "M_E", "2.7182818284590452354" }, /* e */
{ "M_LOG2E", "1.4426950408889634074" }, /* log_2 e */
{ "M_LOG10E", "0.43429448190325182765" }, /* log_10 e */
{ "M_LN2", "0.69314718055994530942" }, /* log_e 2 */
{ "M_LN10", "2.30258509299404568402" }, /* log_e 10 */
{ "M_PI", "3.14159265358979323846" }, /* pi */
{ "M_PI_2", "1.57079632679489661923" }, /* pi/2 */
{ "M_PI_4", "0.78539816339744830962" }, /* pi/4 */
{ "M_1_PI", "0.31830988618379067154" }, /* 1/pi */
{ "M_2_PI", "0.63661977236758134308" }, /* 2/pi */
{ "M_2_SQRTPI", "1.12837916709551257390" }, /* 2/sqrt(pi) */
{ "M_SQRT2", "1.41421356237309504880" }, /* sqrt(2) */
{ "M_SQRT1_2", "0.70710678118654752440" }, /* 1/sqrt(2) */
{ "M_TAU", "6.28318530717958647692" } /* pi*2 */
};
static bool ftepp_define(ftepp_t *ftepp)
{
ppmacro *macro = NULL;
size_t l = ftepp_ctx(ftepp).line;
size_t i;
bool mathconstant = false;
(void)ftepp_next(ftepp);
if (!ftepp_skipspace(ftepp))
return false;
switch (ftepp->token) {
case TOKEN_IDENT:
case TOKEN_TYPENAME:
case TOKEN_KEYWORD:
if (OPTS_FLAG(FTEPP_MATHDEFS)) {
for (i = 0; i < GMQCC_ARRAY_COUNT(ftepp_math_constants); i++) {
if (!strcmp(ftepp_math_constants[i][0], ftepp_tokval(ftepp))) {
mathconstant = true;
break;
}
}
}
macro = ftepp_macro_find(ftepp, ftepp_tokval(ftepp));
if (OPTS_FLAG(FTEPP_MATHDEFS)) {
/* user defined ones take precedence */
if (macro && mathconstant) {
ftepp_macro_delete(ftepp, ftepp_tokval(ftepp));
macro = NULL;
}
}
if (macro && ftepp->output_on) {
if (ftepp_warn(ftepp, WARN_CPP, "redefining `%s`", ftepp_tokval(ftepp)))
return false;
ftepp_macro_delete(ftepp, ftepp_tokval(ftepp));
}
macro = ppmacro_new(ftepp_ctx(ftepp), ftepp_tokval(ftepp));
break;
default:
ftepp_error(ftepp, "expected macro name");
return false;
}
(void)ftepp_next(ftepp);
if (ftepp->token == '(') {
macro->has_params = true;
if (!ftepp_define_params(ftepp, macro)) {
ppmacro_delete(macro);
return false;
}
}
if (!ftepp_skipspace(ftepp)) {
ppmacro_delete(macro);
return false;
}
if (!ftepp_define_body(ftepp, macro)) {
ppmacro_delete(macro);
return false;
}
if (ftepp->output_on)
util_htset(ftepp->macros, macro->name, (void*)macro);
else {
ppmacro_delete(macro);
}
for (; l < ftepp_ctx(ftepp).line; ++l)
ftepp_out(ftepp, "\n", true);
return true;
}
/**
* When a macro is used we have to handle parameters as well
* as special-concatenation via ## or stringification via #
*
* Note: parenthesis can nest, so FOO((a),b) is valid, but only
* this kind of parens. Curly braces or [] don't count towards the
* paren-level.
*/
typedef struct {
pptoken **tokens;
} macroparam;
static void macroparam_clean(macroparam *self)
{
size_t i;
for (i = 0; i < vec_size(self->tokens); ++i)
pptoken_delete(self->tokens[i]);
vec_free(self->tokens);
}
/* need to leave the last token up */
static bool ftepp_macro_call_params(ftepp_t *ftepp, macroparam **out_params)
{
macroparam *params = NULL;
pptoken *ptok;
macroparam mp;
size_t parens = 0;
size_t i;
if (!ftepp_skipallwhite(ftepp))
return false;
while (ftepp->token != ')') {
mp.tokens = NULL;
if (!ftepp_skipallwhite(ftepp))
return false;
while (parens || ftepp->token != ',') {
if (ftepp->token == '(')
++parens;
else if (ftepp->token == ')') {
if (!parens)
break;
--parens;
}
ptok = pptoken_make(ftepp);
vec_push(mp.tokens, ptok);
if (ftepp_next(ftepp) >= TOKEN_EOF) {
ftepp_error(ftepp, "unexpected end of file in macro call");
goto on_error;
}
}
vec_push(params, mp);
mp.tokens = NULL;
if (ftepp->token == ')')
break;
if (ftepp->token != ',') {
ftepp_error(ftepp, "expected closing paren or comma in macro call");
goto on_error;
}
if (ftepp_next(ftepp) >= TOKEN_EOF) {
ftepp_error(ftepp, "unexpected end of file in macro call");
goto on_error;
}
}
*out_params = params;
return true;
on_error:
if (mp.tokens)
macroparam_clean(&mp);
for (i = 0; i < vec_size(params); ++i)
macroparam_clean(¶ms[i]);
vec_free(params);
return false;
}
static bool macro_params_find(ppmacro *macro, const char *name, size_t *idx)
{
size_t i;
for (i = 0; i < vec_size(macro->params); ++i) {
if (!strcmp(macro->params[i], name)) {
*idx = i;
return true;
}
}
return false;
}
static void ftepp_stringify_token(ftepp_t *ftepp, pptoken *token)
{
char chs[2];
const char *ch;
chs[1] = 0;
switch (token->token) {
case TOKEN_STRINGCONST:
ch = token->value;
while (*ch) {
/* in preprocessor mode strings already are string,
* so we don't get actual newline bytes here.
* Still need to escape backslashes and quotes.
*/
switch (*ch) {
case '\\': ftepp_out(ftepp, "\\\\", false); break;
case '"': ftepp_out(ftepp, "\\\"", false); break;
default:
chs[0] = *ch;
ftepp_out(ftepp, chs, false);
break;
}
++ch;
}
break;
case TOKEN_WHITE:
ftepp_out(ftepp, " ", false);
break;
case TOKEN_EOL:
ftepp_out(ftepp, "\\n", false);
break;
default:
ftepp_out(ftepp, token->value, false);
break;
}
}
static void ftepp_stringify(ftepp_t *ftepp, macroparam *param)
{
size_t i;
ftepp_out(ftepp, "\"", false);
for (i = 0; i < vec_size(param->tokens); ++i)
ftepp_stringify_token(ftepp, param->tokens[i]);
ftepp_out(ftepp, "\"", false);
}
static void ftepp_recursion_header(ftepp_t *ftepp)
{
ftepp_out(ftepp, "\n#pragma push(line)\n", false);
}
static void ftepp_recursion_footer(ftepp_t *ftepp)
{
ftepp_out(ftepp, "\n#pragma pop(line)\n", false);
}
static void ftepp_param_out(ftepp_t *ftepp, macroparam *param)
{
size_t i;
pptoken *out;
for (i = 0; i < vec_size(param->tokens); ++i) {
out = param->tokens[i];
if (out->token == TOKEN_EOL)
ftepp_out(ftepp, "\n", false);
else
ftepp_out(ftepp, out->value, false);
}
}
static bool ftepp_preprocess(ftepp_t *ftepp);
static bool ftepp_macro_expand(ftepp_t *ftepp, ppmacro *macro, macroparam *params, bool resetline)
{
char *buffer = NULL;
char *old_string = ftepp->output_string;
char *inner_string;
lex_file *old_lexer = ftepp->lex;
size_t vararg_start = vec_size(macro->params);
bool retval = true;
bool has_newlines;
size_t varargs;
size_t o, pi;
lex_file *inlex;
bool old_inmacro;
bool strip = false;
int nextok;
if (vararg_start < vec_size(params))
varargs = vec_size(params) - vararg_start;
else
varargs = 0;
/* really ... */
if (!vec_size(macro->output))
return true;
ftepp->output_string = NULL;
for (o = 0; o < vec_size(macro->output); ++o) {
pptoken *out = macro->output[o];
switch (out->token) {
case TOKEN_VA_ARGS:
if (!macro->variadic) {
ftepp_error(ftepp, "internal preprocessor error: TOKEN_VA_ARGS in non-variadic macro");
vec_free(old_string);
return false;
}
if (!varargs)
break;
pi = 0;
ftepp_param_out(ftepp, ¶ms[pi + vararg_start]);
for (++pi; pi < varargs; ++pi) {
ftepp_out(ftepp, ", ", false);
ftepp_param_out(ftepp, ¶ms[pi + vararg_start]);
}
break;
case TOKEN_VA_ARGS_ARRAY:
if ((size_t)out->constval.i >= varargs) {
ftepp_error(ftepp, "subscript of `[%u]` is out of bounds for `__VA_ARGS__`", out->constval.i);
vec_free(old_string);
return false;
}
ftepp_param_out(ftepp, ¶ms[out->constval.i + vararg_start]);
break;
case TOKEN_VA_COUNT:
util_asprintf(&buffer, "%d", varargs);
ftepp_out(ftepp, buffer, false);
mem_d(buffer);
break;
case TOKEN_IDENT:
case TOKEN_TYPENAME:
case TOKEN_KEYWORD:
if (!macro_params_find(macro, out->value, &pi)) {
ftepp_out(ftepp, out->value, false);
break;
} else
ftepp_param_out(ftepp, ¶ms[pi]);
break;
case '#':
if (o + 1 < vec_size(macro->output)) {
nextok = macro->output[o+1]->token;
if (nextok == '#') {
/* raw concatenation */
++o;
strip = true;
break;
}
if ( (nextok == TOKEN_IDENT ||
nextok == TOKEN_KEYWORD ||
nextok == TOKEN_TYPENAME) &&
macro_params_find(macro, macro->output[o+1]->value, &pi))
{
++o;
ftepp_stringify(ftepp, ¶ms[pi]);
break;
}
}
ftepp_out(ftepp, "#", false);
break;
case TOKEN_EOL:
ftepp_out(ftepp, "\n", false);
break;
default:
buffer = out->value;
#define buffer_stripable(X) ((X) == ' ' || (X) == '\t')
if (vec_size(macro->output) > o + 1 && macro->output[o+1]->token == '#' && buffer_stripable(*buffer))
buffer++;
if (strip) {
while (buffer_stripable(*buffer)) buffer++;
strip = false;
}
ftepp_out(ftepp, buffer, false);
break;
}
}
vec_push(ftepp->output_string, 0);
/* Now run the preprocessor recursively on this string buffer */
/*
printf("__________\n%s\n=========\n", ftepp->output_string);
*/
inlex = lex_open_string(ftepp->output_string, vec_size(ftepp->output_string)-1, ftepp->lex->name);
if (!inlex) {
ftepp_error(ftepp, "internal error: failed to instantiate lexer");
retval = false;
goto cleanup;
}
inlex->line = ftepp->lex->line;
inlex->sline = ftepp->lex->sline;
ftepp->lex = inlex;
old_inmacro = ftepp->in_macro;
ftepp->in_macro = true;
ftepp->output_string = NULL;
if (!ftepp_preprocess(ftepp)) {
ftepp->in_macro = old_inmacro;
vec_free(ftepp->lex->open_string);
vec_free(ftepp->output_string);
lex_close(ftepp->lex);
retval = false;
goto cleanup;
}
ftepp->in_macro = old_inmacro;
vec_free(ftepp->lex->open_string);
lex_close(ftepp->lex);
inner_string = ftepp->output_string;
ftepp->output_string = old_string;
has_newlines = (strchr(inner_string, '\n') != NULL);
if (has_newlines && !old_inmacro)
ftepp_recursion_header(ftepp);
vec_append(ftepp->output_string, vec_size(inner_string), inner_string);
vec_free(inner_string);
if (has_newlines && !old_inmacro)
ftepp_recursion_footer(ftepp);
if (resetline && !ftepp->in_macro) {
char lineno[128];
util_snprintf(lineno, 128, "\n#pragma line(%lu)\n", (unsigned long)(old_lexer->sline));
ftepp_out(ftepp, lineno, false);
}
old_string = ftepp->output_string;
cleanup:
ftepp->lex = old_lexer;
ftepp->output_string = old_string;
return retval;
}
static bool ftepp_macro_call(ftepp_t *ftepp, ppmacro *macro)
{
size_t o;
macroparam *params = NULL;
bool retval = true;
size_t paramline;
if (!macro->has_params) {
if (!ftepp_macro_expand(ftepp, macro, NULL, false))
return false;
ftepp_next(ftepp);
return true;
}
ftepp_next(ftepp);
if (!ftepp_skipallwhite(ftepp))
return false;
if (ftepp->token != '(') {
ftepp_error(ftepp, "expected macro parameters in parenthesis");
return false;
}
ftepp_next(ftepp);
paramline = ftepp->lex->sline;
if (!ftepp_macro_call_params(ftepp, ¶ms))
return false;
if ( vec_size(params) < vec_size(macro->params) ||
(vec_size(params) > vec_size(macro->params) && !macro->variadic) )
{
ftepp_error(ftepp, "macro %s expects%s %u paramteters, %u provided", macro->name,
(macro->variadic ? " at least" : ""),
(unsigned int)vec_size(macro->params),
(unsigned int)vec_size(params));
retval = false;
goto cleanup;
}
if (!ftepp_macro_expand(ftepp, macro, params, (paramline != ftepp->lex->sline)))
retval = false;
ftepp_next(ftepp);
cleanup:
for (o = 0; o < vec_size(params); ++o)
macroparam_clean(¶ms[o]);
vec_free(params);
return retval;
}
/**
* #if - the FTEQCC way:
* defined(FOO) => true if FOO was #defined regardless of parameters or contents
* <numbers> => True if the number is not 0
* !<factor> => True if the factor yields false
* !!<factor> => ERROR on 2 or more unary nots
* <macro> => becomes the macro's FIRST token regardless of parameters
* <e> && <e> => True if both expressions are true
* <e> || <e> => True if either expression is true
* <string> => False
* <ident> => False (remember for macros the <macro> rule applies instead)
* Unary + and - are weird and wrong in fteqcc so we don't allow them
* parenthesis in expressions are allowed
* parameter lists on macros are errors
* No mathematical calculations are executed
*/
static bool ftepp_if_expr(ftepp_t *ftepp, bool *out, double *value_out);
static bool ftepp_if_op(ftepp_t *ftepp)
{
ftepp->lex->flags.noops = false;
ftepp_next(ftepp);
if (!ftepp_skipspace(ftepp))
return false;
ftepp->lex->flags.noops = true;
return true;
}
static bool ftepp_if_value(ftepp_t *ftepp, bool *out, double *value_out)
{
ppmacro *macro;
bool wasnot = false;