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directive.c
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directive.c
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/*-
* Copyright (c) 1998, 2002-2008 Kiyoshi Matsui <kmatsui@t3.rim.or.jp>
* All rights reserved.
*
* Some parts of this code are derived from the public domain software
* DECUS cpp (1984,1985) written by Martin Minow.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* D I R E C T I V E . C
* P r o c e s s D i r e c t i v e L i n e s
*
* The routines to handle directives other than #include and #pragma
* are placed here.
*/
#include "system.H"
#include "internal.H"
static int do_if( int hash, const char * directive_name);
/* #if, #elif, #ifdef, #ifndef */
static void sync_linenum( void);
/* Synchronize number of newlines */
static long do_line( void);
/* Process #line directive */
static int get_parm( void);
/* Get parameters of macro, its nargs, names, lengths */
static int get_repl( const char * macroname);
/* Get replacement text embedding parameter number */
static char * is_formal( const char * name, int conv);
/* If formal parameter, save the number */
static char * def_stringization( char * repl_cur);
/* Define stringization */
static char * mgtoken_save( const char * macroname);
/* Prefix DEF_MAGIC to macro name in repl-text */
static void do_undef( void);
/* Process #undef directive */
static void dump_repl( const DEFBUF * dp, FILE * fp, int gcc2_va);
/* Dump replacement text */
/*
* Generate (by hand-inspection) a set of unique values for each directive.
* MCPP won't compile if there are hash conflicts.
*/
#define L_if ('i' ^ (EOS << 1))
#define L_ifdef ('i' ^ ('d' << 1))
#define L_ifndef ('i' ^ ('n' << 1))
#define L_elif ('e' ^ ('i' << 1))
#define L_else ('e' ^ ('s' << 1))
#define L_endif ('e' ^ ('d' << 1))
#define L_define ('d' ^ ('f' << 1))
#define L_undef ('u' ^ ('d' << 1))
#define L_line ('l' ^ ('n' << 1))
#define L_include ('i' ^ ('c' << 1))
#if SYSTEM == SYS_MAC
#define L_import ('i' ^ ('p' << 1))
#endif
#define L_error ('e' ^ ('r' << 1))
#define L_pragma ('p' ^ ('a' << 1))
static const char * const not_ident
= "Not an identifier \"%s\""; /* _E_ */
static const char * const no_arg = "No argument"; /* _E_ */
static const char * const excess
= "Excessive token sequence \"%s\""; /* _E_ _W1_ */
void directive( void)
/*
* Process #directive lines. Each directive have their own subroutines.
*/
{
const char * const many_nesting =
"More than %.0s%ld nesting of #if (#ifdef) sections%s"; /* _F_ _W4_ _W8_ */
const char * const not_in_section
= "Not in a #if (#ifdef) section in a source file"; /* _E_ _W1_ */
const char * const illeg_dir
= "Illegal #directive \"%s%.0ld%s\""; /* _E_ _W1_ _W8_ */
const char * const in_skipped = " (in skipped block)"; /* _W8_ */
FILEINFO * file;
int token_type;
int hash;
int c;
char * tp;
in_directive = TRUE;
if (keep_comments) {
mcpp_fputc( '\n', OUT); /* Possibly flush out comments */
newlines--;
}
c = skip_ws();
if (c == '\n') /* 'null' directive */
goto ret;
token_type = scan_token( c, (workp = work_buf, &workp), work_end);
if (token_type != NAM) {
if (compiling) {
cerror( illeg_dir, work_buf, 0L, NULL);
} else if (warn_level & 8) {
cwarn( illeg_dir, work_buf, 0L, in_skipped);
}
goto skip_line;
}
hash = (identifier[ 1] == EOS) ? identifier[ 0]
: (identifier[ 0] ^ (identifier[ 2] << 1));
if (strlen( identifier) > 7)
hash ^= (identifier[ 7] << 1);
/* hash is set to a unique value corresponding to the directive.*/
switch (hash) {
case L_if: tp = "if"; break;
case L_ifdef: tp = "ifdef"; break;
case L_ifndef: tp = "ifndef"; break;
case L_elif: tp = "elif"; break;
case L_else: tp = "else"; break;
case L_endif: tp = "endif"; break;
case L_define: tp = "define"; break;
case L_undef: tp = "undef"; break;
case L_line: tp = "line"; break;
case L_include: tp = "include"; break;
#if SYSTEM == SYS_MAC
case L_import: tp = "import"; break;
#endif
case L_error: tp = "error"; break;
case L_pragma: tp = "pragma"; break;
default: tp = NULL; break;
}
if (tp != NULL && ! str_eq( identifier, tp)) { /* Hash conflict*/
hash = 0; /* Unknown directive, will */
tp = NULL; /* be handled by do_old() */
}
if (! compiling) { /* Not compiling now */
switch (hash) {
case L_elif :
case L_else : /* Test the #if's nest, if 0, compile */
case L_endif: /* Un-nest #if */
break;
case L_if : /* These can't turn */
case L_ifdef: /* compilation on, but */
case L_ifndef : /* we must nest #if's.*/
if (&ifstack[ BLK_NEST] < ++ifptr)
goto if_nest_err;
if ((warn_level & 8)
&& &ifstack[ std_limits.blk_nest + 1] == ifptr)
cwarn( many_nesting, NULL, (long) std_limits.blk_nest
, in_skipped);
ifptr->stat = 0; /* !WAS_COMPILING */
ifptr->ifline = src_line; /* Line at section start*/
goto skip_line;
default : /* Other directives */
if (tp == NULL && (warn_level & 8))
do_old(); /* Unknown directive ? */
goto skip_line; /* Skip the line */
}
}
macro_line = 0; /* Reset error flag */
file = infile; /* Remember the current file */
switch (hash) {
case L_if:
case L_ifdef:
case L_ifndef:
if (&ifstack[ BLK_NEST] < ++ifptr)
goto if_nest_err;
if ((warn_level & 4) &&
&ifstack[ std_limits.blk_nest + 1] == ifptr)
cwarn( many_nesting, NULL , (long) std_limits.blk_nest, NULL);
ifptr->stat = WAS_COMPILING;
ifptr->ifline = src_line;
goto ifdo;
case L_elif:
if (ifptr == &ifstack[0])
goto nest_err;
if (ifptr == infile->initif) {
goto in_file_nest_err;
}
if (ifptr->stat & ELSE_SEEN)
goto else_seen_err;
if ((ifptr->stat & (WAS_COMPILING | TRUE_SEEN)) != WAS_COMPILING) {
compiling = FALSE; /* Done compiling stuff */
goto skip_line; /* Skip this group */
}
hash = L_if;
ifdo:
c = do_if( hash, tp);
if (mcpp_debug & IF) {
mcpp_fprintf( DBG
, "#if (#elif, #ifdef, #ifndef) evaluate to %s.\n"
, compiling ? "TRUE" : "FALSE");
mcpp_fprintf( DBG, "line %ld: %s", src_line, infile->buffer);
}
if (c == FALSE) { /* Error */
compiling = FALSE; /* Skip this group */
goto skip_line; /* Prevent an extra error message */
}
break;
case L_else:
if (ifptr == &ifstack[0])
goto nest_err;
if (ifptr == infile->initif) {
goto in_file_nest_err;
}
if (ifptr->stat & ELSE_SEEN)
goto else_seen_err;
ifptr->stat |= ELSE_SEEN;
ifptr->elseline = src_line;
if (ifptr->stat & WAS_COMPILING) {
if (compiling || (ifptr->stat & TRUE_SEEN) != 0)
compiling = FALSE;
else
compiling = TRUE;
}
if ((mcpp_debug & MACRO_CALL) && (ifptr->stat & WAS_COMPILING)) {
sync_linenum();
mcpp_fprintf( OUT, "/*else %ld:%c*/\n", src_line
, compiling ? 'T' : 'F'); /* Show that #else is seen */
}
break;
case L_endif:
if (ifptr == &ifstack[0])
goto nest_err;
if (ifptr <= infile->initif) {
goto in_file_nest_err;
}
if (! compiling && (ifptr->stat & WAS_COMPILING))
wrong_line = TRUE;
compiling = (ifptr->stat & WAS_COMPILING);
if ((mcpp_debug & MACRO_CALL) && compiling) {
sync_linenum();
mcpp_fprintf( OUT, "/*endif %ld*/\n", src_line);
/* Show that #if block has ended */
}
--ifptr;
break;
case L_define:
do_define( FALSE, 0);
break;
case L_undef:
do_undef();
break;
case L_line:
if ((c = do_line()) > 0) {
src_line = c;
sharp( NULL, 0); /* Putout the new line number and file name */
infile->line = --src_line; /* Next line number is 'src_line' */
newlines = -1;
} else { /* Error already diagnosed by do_line() */
skip_nl();
}
break;
case L_include:
in_include = TRUE;
if (do_include( FALSE) == TRUE && file != infile)
newlines = -1; /* File has been included. Clear blank lines */
in_include = FALSE;
break;
case L_error:
cerror( infile->buffer, NULL, 0L, NULL); /* _E_ */
break;
case L_pragma:
do_pragma();
newlines = -1; /* Do not putout excessive '\n' */
break;
default: /* Non-Standard or unknown directives */
do_old();
break;
}
switch (hash) {
case L_if :
case L_elif :
case L_define :
case L_line :
goto skip_line; /* To prevent duplicate error message */
#if SYSTEM == SYS_MAC
case L_import :
if (file != infile) /* File has been included */
newlines = -1;
#endif
case L_error :
goto skip_line;
case L_include :
case L_pragma :
break; /* Already read over the line */
default : /* L_else, L_endif, L_undef, etc. */
if (skip_ws() != '\n') {
cerror( excess, infile->bptr-1, 0L, NULL);
}
skip_nl();
}
goto ret;
in_file_nest_err:
cerror( not_in_section, NULL, 0L, NULL);
goto skip_line;
nest_err:
cerror( "Not in a #if (#ifdef) section", NULL, 0L, NULL); /* _E_ */
goto skip_line;
else_seen_err:
cerror( "Already seen #else at line %.0s%ld" /* _E_ */
, NULL, ifptr->elseline, NULL);
skip_line:
skip_nl(); /* Ignore rest of line */
goto ret;
if_nest_err:
cfatal( many_nesting, NULL, (long) BLK_NEST, NULL);
ret:
in_directive = FALSE;
keep_comments = option_flags.c && compiling && !no_output;
/* keep_spaces is on for #define line even if no_output is TRUE */
if (! wrong_line)
newlines++;
}
static int do_if( int hash, const char * directive_name)
/*
* Process an #if (#elif), #ifdef or #ifndef. The latter two are straight-
* forward, while #if needs a subroutine to evaluate the expression.
* do_if() is called only if compiling is TRUE. If false, compilation is
* always supressed, so we don't need to evaluate anything. This supresses
* unnecessary warnings.
*/
{
int c;
int found;
DEFBUF * defp;
if ((c = skip_ws()) == '\n') {
unget_ch();
cerror( no_arg, NULL, 0L, NULL);
return FALSE;
}
if (mcpp_debug & MACRO_CALL) {
sync_linenum();
mcpp_fprintf( OUT, "/*%s %ld*/", directive_name, src_line);
}
if (hash == L_if) { /* #if or #elif */
unget_ch();
found = (eval_if() != 0L); /* Evaluate expression */
if (mcpp_debug & MACRO_CALL)
in_if = FALSE; /* 'in_if' is dynamically set in eval_lex() */
hash = L_ifdef; /* #if is now like #ifdef */
} else { /* #ifdef or #ifndef */
if (scan_token( c, (workp = work_buf, &workp), work_end) != NAM) {
cerror( not_ident, work_buf, 0L, NULL);
return FALSE; /* Next token is not an identifier */
}
found = ((defp = look_id( identifier)) != NULL); /* Look in table*/
if (mcpp_debug & MACRO_CALL) {
if (found)
mcpp_fprintf( OUT, "/*%s*/", defp->name);
}
}
if (found == (hash == L_ifdef)) {
compiling = TRUE;
ifptr->stat |= TRUE_SEEN;
} else {
compiling = FALSE;
}
if (mcpp_debug & MACRO_CALL) {
mcpp_fprintf( OUT, "/*i %c*/\n", compiling ? 'T' : 'F');
/* Report wheather the directive is evaluated TRUE or FALSE */
}
return TRUE;
}
static void sync_linenum( void)
/*
* Put out newlines or #line line to synchronize line number with the
* annotations about #if, #elif, #ifdef, #ifndef, #else or #endif on -K option.
*/
{
if (wrong_line || newlines > 10) {
sharp( NULL, 0);
} else {
while (newlines-- > 0)
mcpp_fputc('\n', OUT);
}
newlines = -1;
}
static long do_line( void)
/*
* Parse the line to update the line number and "filename" field for the next
* input line.
* Values returned are as follows:
* -1: syntax error or out-of-range error (diagnosed by do_line(),
* eval_num()).
* [1,32767]: legal line number for C90, [1,2147483647] for C99.
* Line number [32768,2147483647] in C90 mode is only warned (not an error).
* do_line() always absorbs the line (except the <newline>).
*/
{
const char * const not_digits
= "Line number \"%s\" isn't a decimal digits sequence"; /* _E_ _W1_ */
const char * const out_of_range
= "Line number \"%s\" is out of range of [1,%ld]"; /* _E_ _W1_ */
int token_type;
VAL_SIGN * valp;
char * save;
int c;
if ((c = skip_ws()) == '\n') {
cerror( no_arg, NULL, 0L, NULL);
unget_ch(); /* Push back <newline> */
return -1L; /* Line number is not changed */
}
token_type = get_unexpandable( c, FALSE);
if (macro_line == MACRO_ERROR) /* Unterminated macro */
return -1L; /* already diagnosed. */
if (token_type == NO_TOKEN) /* Macro expanded to 0 token */
goto no_num;
if (token_type != NUM)
goto illeg_num;
for (workp = work_buf; *workp != EOS; workp++) {
if (! isdigit( *workp & UCHARMAX)) {
cerror( not_digits, work_buf, 0L, NULL);
return -1L;
}
}
valp = eval_num( work_buf); /* Evaluate number */
if (valp->sign == VAL_ERROR) { /* Error diagnosed by eval_num()*/
return -1;
} else if ((std_limits.line_num < valp->val || valp->val <= 0L)) {
if (valp->val < LINE99LIMIT && valp->val > 0L) {
if (warn_level & 1)
cwarn( out_of_range, work_buf, std_limits.line_num, NULL);
} else {
cerror( out_of_range, work_buf, std_limits.line_num, NULL);
return -1L;
}
}
token_type = get_unexpandable( skip_ws(), FALSE);
if (macro_line == MACRO_ERROR)
return -1L;
if (token_type != STR) {
if (token_type == NO_TOKEN) { /* Filename is absent */
return (long) valp->val;
} else { /* Expanded macro should be a quoted string */
goto not_fname;
}
}
{
*(workp - 1) = EOS; /* Ignore right '"' */
save = save_string( &work_buf[ 1]); /* Ignore left '"' */
}
if (get_unexpandable( skip_ws(), FALSE) != NO_TOKEN) {
cerror( excess, work_buf, 0L, NULL);
free( save);
return -1L;
}
if (infile->filename)
free( infile->filename);
infile->filename = save; /* New file name */
/* Note that this does not change infile->real_fname */
return (long) valp->val; /* New line number */
no_num:
cerror( "No line number", NULL, 0L, NULL); /* _E_ */
return -1L;
illeg_num:
cerror( "Not a line number \"%s\"", work_buf, 0L, NULL); /* _E_ */
return -1L;
not_fname:
cerror( "Not a file name \"%s\"", work_buf, 0L, NULL); /* _E_ */
return -1L;
}
/*
* M a c r o D e f i n i t i o n s
*/
/*
* look_id() Looks for the name in the defined symbol table. Returns a
* pointer to the definition if found, or NULL if not present.
* install_macro() Installs the definition. Updates the symbol table.
* undefine() Deletes the definition from the symbol table.
*/
/*
* Global work_buf[] are used to store #define parameter lists and
* parms[].name point to them.
* 'nargs' contains the actual number of parameters stored.
*/
typedef struct {
char * name; /* -> Start of each parameter */
size_t len; /* Length of parameter name */
} PARM;
static PARM parms[ NMACPARS];
static int nargs; /* Number of parameters */
static char * token_p; /* Pointer to the token scanned */
static char * repl_base; /* Base of buffer for repl-text */
static char * repl_end; /* End of buffer for repl-text */
static const char * const no_ident = "No identifier"; /* _E_ */
DEFBUF * do_define(
int ignore_redef, /* Do not redefine */
int predefine /* Predefine compiler-specific name */
/*
* Note: The value of 'predefine' should be one of 0, DEF_NOARGS_PREDEF
* or DEF_NOARGS_PREDEF_OLD, the other values cause errors.
*/
)
/*
* Called from directive() when a #define is scanned or called from
* do_options() when a -D option is scanned. This module parses formal
* parameters by get_parm() and the replacement text by get_repl().
*
* There is some special case code to distinguish
* #define foo bar -- object-like macro
* from #define foo() bar -- function-like macro with no parameter
*
* Also, we make sure that
* #define foo foo
* expands to "foo" but doesn't put MCPP into an infinite loop.
*
* A warning is printed if you redefine a symbol with a non-identical
* text. I.e,
* #define foo 123
* #define foo 123
* is ok, but
* #define foo 123
* #define foo +123
* is not.
*
* The following subroutines are called from do_define():
* get_parm() parsing and remembering parameter names.
* get_repl() parsing and remembering replacement text.
*
* The following subroutines are called from get_repl():
* is_formal() is called when an identifier is scanned. It checks through
* the array of formal parameters. If a match is found, the
* identifier is replaced by a control byte which will be used
* to locate the parameter when the macro is expanded.
* def_stringization() is called when '#' operator is scanned. It surrounds
* the token to stringize with magic-codes.
*
* modes other than STD ignore difference of parameter names in macro
* redefinition.
*/
{
const char * const predef = "\"%s\" shouldn't be redefined"; /* _E_ */
char repl_list[ NMACWORK + IDMAX]; /* Replacement text */
char macroname[ IDMAX + 1]; /* Name of the macro defining */
DEFBUF * defp; /* -> Old definition */
DEFBUF ** prevp; /* -> Pointer to previous def in list */
int c;
int redefined; /* TRUE if redefined */
int dnargs = 0; /* defp->nargs */
int cmp; /* Result of name comparison */
size_t def_start, def_end; /* Column of macro definition */
repl_base = repl_list;
repl_end = & repl_list[ NMACWORK];
c = skip_ws();
if ((mcpp_debug & MACRO_CALL) && src_line) /* Start of definition */
def_start = infile->bptr - infile->buffer - 1;
if (c == '\n') {
cerror( no_ident, NULL, 0L, NULL);
unget_ch();
return NULL;
} else if (scan_token( c, (workp = work_buf, &workp), work_end) != NAM) {
cerror( not_ident, work_buf, 0L, NULL);
return NULL;
} else {
prevp = look_prev( identifier, &cmp);
/* Find place in the macro list to insert the definition */
defp = *prevp;
if (cmp || defp->push) { /* Not known or 'pushed' macro */
if (str_eq( identifier, "defined")
|| ((stdc_val)
&& str_eq( identifier, "__VA_ARGS__"))) {
cerror(
"\"%s\" shouldn't be defined", identifier, 0L, NULL); /* _E_ */
return NULL;
}
redefined = FALSE; /* Quite new definition */
} else { /* It's known: */
if (ignore_redef)
return defp;
dnargs = (defp->nargs == DEF_NOARGS_STANDARD
|| defp->nargs == DEF_NOARGS_PREDEF
|| defp->nargs == DEF_NOARGS_PREDEF_OLD)
? DEF_NOARGS : defp->nargs;
if (dnargs <= DEF_NOARGS_DYNAMIC /* __FILE__ and such */
|| dnargs == DEF_PRAGMA /* _Pragma() pseudo-macro */
) {
cerror( predef, identifier, 0L, NULL);
return NULL;
} else {
redefined = TRUE; /* Remember this fact */
}
}
}
strcpy( macroname, identifier); /* Remember the name */
in_define = TRUE; /* Recognize '#', '##' */
if (get_parm() == FALSE) { /* Get parameter list */
in_define = FALSE;
return NULL; /* Syntax error */
}
if (get_repl( macroname) == FALSE) { /* Get replacement text */
in_define = FALSE;
return NULL; /* Syntax error */
}
if ((mcpp_debug & MACRO_CALL) && src_line) {
/* Remember location on source */
char * cp;
cp = infile->bptr - 1; /* Before '\n' */
while (char_type[ *cp & UCHARMAX] & HSP)
cp--; /* Trailing space */
cp++; /* Just after the last token */
def_end = cp - infile->buffer; /* End of definition */
}
in_define = FALSE;
if (redefined) {
if (dnargs != nargs || ! str_eq( defp->repl, repl_list)
|| (! str_eq( defp->parmnames, work_buf))
) { /* Warn if differently redefined */
if (warn_level & 1) {
cwarn(
"The macro is redefined", NULL, 0L, NULL); /* _W1_ */
dump_a_def( " previously macro", defp, FALSE, TRUE
, fp_err);
}
} else { /* Identical redefinition */
return defp;
}
} /* Else new or re-definition*/
defp = install_macro( macroname, nargs, work_buf, repl_list, prevp, cmp
, predefine);
if ((mcpp_debug & MACRO_CALL) && src_line) {
/* Get location on source file */
LINE_COL s_line_col, e_line_col;
s_line_col.line = src_line;
s_line_col.col = def_start;
get_src_location( & s_line_col);
/* Convert to pre-line-splicing data */
e_line_col.line = src_line;
e_line_col.col = def_end;
get_src_location( & e_line_col);
/* Putout the macro definition information embedded in comment */
mcpp_fprintf( OUT, "/*m%s %ld:%d-%ld:%d*/\n", defp->name
, s_line_col.line, s_line_col.col
, e_line_col.line, e_line_col.col);
wrong_line = TRUE; /* Need #line later */
}
return defp;
}
static int get_parm( void)
/*
* Get parameters i.e. numbers into nargs, name into work_buf[], name-length
* into parms[].len. parms[].name point into work_buf.
* Return TRUE if the parameters are legal, else return FALSE.
* In STD mode preprocessor must remember the parameter names, only for
* checking the validity of macro redefinitions. This is required by the
* Standard (what an overhead !).
*/
{
const char * const many_parms
= "More than %.0s%ld parameters"; /* _E_ _W4_ */
const char * const illeg_parm
= "Illegal parameter \"%s\""; /* _E_ */
const char * const misplaced_ellip
= "\"...\" isn't the last parameter"; /* _E_ */
int token_type;
int c;
parms[ 0].name = workp = work_buf;
work_buf[ 0] = EOS;
/* POST_STD mode */
insert_sep = NO_SEP; /* Clear the inserted token separator */
c = get_ch();
if (c == '(') { /* With arguments? */
nargs = 0; /* Init parms counter */
if (skip_ws() == ')')
return TRUE; /* Macro with 0 parm */
else
unget_ch();
do { /* Collect parameters */
if (nargs >= NMACPARS) {
cerror( many_parms, NULL, (long) NMACPARS, NULL);
return FALSE;
}
parms[ nargs].name = workp; /* Save its start */
if ((token_type = scan_token( c = skip_ws(), &workp, work_end))
!= NAM) {
if (c == '\n') {
break;
} else if (c == ',' || c == ')') {
cerror( "Empty parameter", NULL, 0L, NULL); /* _E_ */
return FALSE;
} else if ((stdc_val)
&& token_type == OPE && openum == OP_ELL) {
/*
* Enable variable argument macro which is a feature of
* C99. We enable this even on C90 or C++ for GCC
* compatibility.
*/
if (skip_ws() != ')') {
cerror( misplaced_ellip, NULL, 0L, NULL);
return FALSE;
}
parms[ nargs++].len = 3;
nargs |= VA_ARGS;
goto ret;
} else {
cerror( illeg_parm, parms[ nargs].name, 0L, NULL);
return FALSE; /* Bad parameter syntax */
}
}
if ((stdc_val)
&& str_eq( identifier, "__VA_ARGS__")) {
cerror( illeg_parm, parms[ nargs].name, 0L, NULL);
return FALSE;
/* __VA_ARGS__ should not be used as a parameter */
}
if (is_formal( parms[ nargs].name, FALSE)) {
cerror( "Duplicate parameter name \"%s\"" /* _E_ */
, parms[ nargs].name, 0L, NULL);
return FALSE;
}
parms[ nargs].len = (size_t) (workp - parms[ nargs].name);
/* Save length of param */
*workp++ = ',';
nargs++;
} while ((c = skip_ws()) == ','); /* Get another parameter*/
*--workp = EOS; /* Remove excessive ',' */
if (c != ')') { /* Must end at ) */
unget_ch(); /* Push back '\n' */
cerror(
"Missing \",\" or \")\" in parameter list \"(%s\"" /* _E_ */
, work_buf, 0L, NULL);
return FALSE;
}
} else {
/*
* DEF_NOARGS is needed to distinguish between
* "#define foo" and "#define foo()".
*/
nargs = DEF_NOARGS; /* Object-like macro */
unget_ch();
}
ret:
#if NMACPARS > NMACPARS90MIN
if ((warn_level & 4) && (nargs & ~AVA_ARGS) > std_limits.n_mac_pars)
cwarn( many_parms, NULL , (long) std_limits.n_mac_pars, NULL);
#endif
return TRUE;
}
static int get_repl(
const char * macroname
)
/*
* Get replacement text i.e. names of formal parameters are converted to
* the magic numbers, and operators #, ## is converted to magic characters.
* Return TRUE if replacement list is legal, else return FALSE.
* Any token separator in the text is converted to a single space, no token
* sepatator is inserted by MCPP. Those are required by the Standard for
* stringizing of an argument by # operator.
* In POST_STD mode, inserts a space between any tokens in source (except a
* macro name and the next '(' in macro definition), hence presence or absence
* of token separator makes no difference.
*/
{
const char * const mixed_ops
= "Macro with mixing of ## and # operators isn't portable"; /* _W4_ */
const char * const multiple_cats
= "Macro with multiple ## operators isn't portable"; /* _W4_ */
char * prev_token = NULL; /* Preceding token */
char * prev_prev_token = NULL; /* Pre-preceding token */
int multi_cats = FALSE; /* Multiple ## operators*/
int c;
int token_type; /* Type of token */
char * temp;
char * repl_cur = repl_base; /* Pointer into repl-text buffer*/
*repl_cur = EOS;
token_p = NULL;
c = get_ch();
unget_ch();
if (((char_type[ c] & SPA) == 0) && (nargs < 0) && (warn_level & 1))
cwarn( "No space between macro name \"%s\" and repl-text"/* _W1_ */
, macroname, 0L, NULL);
c = skip_ws(); /* Get to the body */
while (c != '\n') {
prev_prev_token = prev_token;
prev_token = token_p;
token_p = repl_cur; /* Remember the pointer */
token_type = scan_token( c, &repl_cur, repl_end);
switch (token_type) {
case OPE: /* Operator or punctuator */
switch (openum) {
case OP_CAT: /* ## */
if (prev_token == NULL) {
cerror( "No token before ##" /* _E_ */
, NULL, 0L, NULL);
return FALSE;
} else if (*prev_token == CAT) {
cerror( "## after ##", NULL, 0L, NULL); /* _E_ */
return FALSE;
} else if (prev_prev_token && *prev_prev_token == CAT) {
multi_cats = TRUE;
} else if (prev_prev_token && *prev_prev_token == ST_QUOTE
&& (warn_level & 4)) { /* # parm ## */
cwarn( mixed_ops, NULL, 0L, NULL);
}
repl_cur = token_p;
*repl_cur++ = CAT; /* Convert to CAT */
break;
case OP_STR: /* # */
if (nargs < 0) /* In object-like macro */
break; /* '#' is an usual char */
if (prev_token && *prev_token == CAT
&& (warn_level & 4)) /* ## # */
cwarn( mixed_ops, NULL, 0L, NULL);
repl_cur = token_p; /* Overwrite on # */
if ((temp = def_stringization( repl_cur)) == NULL) {
return FALSE; /* Error */
} else {
repl_cur = temp;
}
break;
default: /* Any operator as it is */
break;
}
break;
case NAM:
/*
* Replace this name if it's a parm. Note that the macro name is a
* possible replacement token. We stuff DEF_MAGIC in front of the
* token which is treated as a LETTER by the token scanner and eaten
* by the macro expanding routine. This prevents the macro expander
* from looping if someone writes "#define foo foo".
*/
temp = is_formal( identifier, TRUE);
if (temp == NULL) { /* Not a parameter name */
if ((stdc_val)
&& str_eq( identifier, "__VA_ARGS__")) {
cerror( "\"%s\" without corresponding \"...\"" /* _E_ */
, identifier, 0L, NULL);
return FALSE;
}
if ((temp = mgtoken_save( macroname)) != NULL)
repl_cur = temp; /* Macro name */
} else { /* Parameter name */
repl_cur = temp;
}
break;
case STR: /* String in mac. body */
case CHR: /* Character constant */
break;
case SEP:
break;
default: /* Any token as it is */
break;
}
if ((c = get_ch()) == ' ' || c == '\t') {
*repl_cur++ = ' '; /* Space */
while ((c = get_ch()) == ' ' || c == '\t')
; /* Skip excessive spaces */
}
}
while (repl_base < repl_cur
&& (*(repl_cur - 1) == ' ' || *(repl_cur - 1) == '\t'))
repl_cur--; /* Remove trailing spaces */
*repl_cur = EOS; /* Terminate work */
unget_ch(); /* For syntax check */
if (token_p && *token_p == CAT) {
cerror( "No token after ##", NULL, 0L, NULL); /* _E_ */
return FALSE;
}
if (multi_cats && (warn_level & 4))
cwarn( multiple_cats, NULL, 0L, NULL);
if ((nargs & VA_ARGS) && stdc_ver < 199901L && (warn_level & 2))
/* Variable arg macro is the spec of C99, not C90 nor C++98 */
cwarn( "Variable argument macro is defined", /* _W2_ */
NULL, 0L, NULL);
return TRUE;
}
static char * is_formal(
const char * name,
int conv /* Convert to magic number? */
)
/*
* If the identifier is a formal parameter, save the MAC_PARM and formal
* offset, returning the advanced pointer into the replacement text.
* Else, return NULL.
*/
{
char * repl_cur;
const char * va_arg = "__VA_ARGS__";
PARM parm;
size_t len;
int i;
len = strlen( name);
for (i = 0; i < (nargs & ~AVA_ARGS); i++) { /* For each parameter */
parm = parms[ i];
if ((len == parm.len
/* Note: parms[].name are comma separated */
&& memcmp( name, parm.name, parm.len) == 0)
|| ((nargs & VA_ARGS)
&& i == (nargs & ~AVA_ARGS) - 1 && conv
&& str_eq( name, va_arg))) { /* __VA_ARGS__ */
/* If it's known */
if (conv) {
repl_cur = token_p; /* Overwrite on the name*/
*repl_cur++ = MAC_PARM; /* Save the signal */
*repl_cur++ = i + 1; /* Save the parm number */
return repl_cur; /* Return "gotcha" */
} else {
return parm.name; /* Duplicate parm name */
}
}
}
return NULL; /* Not a formal param */
}
static char * def_stringization( char * repl_cur)
/*
* Define token stringization.
* We store a magic cookie (which becomes surrouding " on expansion) preceding
* the parameter as an operand of # operator.
* Return the current pointer into replacement text if the token following #
* is a parameter name, else return NULL.
*/
{
int c;
char * temp;
*repl_cur++ = ST_QUOTE; /* Prefix */
if (char_type[ c = get_ch()] & HSP) { /* There is a space */
*repl_cur++ = ' ';
while (char_type[ c = get_ch()] & HSP) /* Skip excessive spaces*/
;
}
token_p = repl_cur; /* Remember the pointer */
if (scan_token( c, &repl_cur, repl_end) == NAM) {
if ((temp = is_formal( identifier, TRUE)) != NULL) {
repl_cur = temp;
return repl_cur;
}
}
cerror( "Not a formal parameter \"%s\"", token_p, 0L, NULL); /* _E_ */