diff options
Diffstat (limited to 'gas/cond.c')
| -rw-r--r-- | gas/cond.c | 443 |
1 files changed, 256 insertions, 187 deletions
@@ -1,21 +1,21 @@ /* cond.c - conditional assembly pseudo-ops, and .include - Copyright (C) 1990, 1991 Free Software Foundation, Inc. - + Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc. + This file is part of GAS, the GNU Assembler. - + GAS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - + GAS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - + You should have received a copy of the GNU General Public License along with GAS; see the file COPYING. If not, write to - the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "as.h" @@ -24,206 +24,275 @@ /* This is allocated to grow and shrink as .ifdef/.endif pairs are scanned. */ struct obstack cond_obstack; -struct file_line { - char *logical_file; - int logical_line; - char *physical_file; - int physical_line; -}; /* file_line */ +struct file_line +{ + char *file; + unsigned int line; +}; /* file_line */ /* This is what we push and pop. */ -struct conditional_frame { - struct file_line if_file_line; /* the source file & line number of the "if" */ - struct file_line else_file_line; /* the source file & line of the "else" */ - struct conditional_frame *previous_cframe; - int else_seen; /* have we seen an else yet? */ - int ignoring; /* if we are currently ignoring input. */ - int dead_tree; /* if a conditional at a higher level is ignoring input. */ -}; /* conditional_frame */ +struct conditional_frame + { + struct file_line if_file_line; /* the source file & line number of the "if" */ + struct file_line else_file_line; /* the source file & line of the "else" */ + struct conditional_frame *previous_cframe; + int else_seen; /* have we seen an else yet? */ + int ignoring; /* if we are currently ignoring input. */ + int dead_tree; /* if a conditional at a higher level is ignoring input. */ + }; /* conditional_frame */ -#ifdef __STDC__ +static void initialize_cframe PARAMS ((struct conditional_frame *cframe)); +static char *get_mri_string PARAMS ((int, int *)); -static void get_file_line(struct file_line *into); -static void initialize_cframe(struct conditional_frame *cframe); -static void set_file_line(struct file_line *from); +static struct conditional_frame *current_cframe = NULL; -#else +void +s_ifdef (arg) + int arg; +{ + register char *name; /* points to name of symbol */ + register struct symbol *symbolP; /* Points to symbol */ + struct conditional_frame cframe; -static void get_file_line(); -static void initialize_cframe(); -static void set_file_line(); + SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */ + name = input_line_pointer; -#endif + if (!is_name_beginner (*name)) + { + as_bad ("invalid identifier for \".ifdef\""); + obstack_1grow (&cond_obstack, 0); + } + else + { + get_symbol_end (); + ++input_line_pointer; + symbolP = symbol_find (name); -static struct conditional_frame *current_cframe = NULL; + initialize_cframe (&cframe); + cframe.ignoring = cframe.dead_tree || !((symbolP != 0) ^ arg); + current_cframe = (struct conditional_frame *) obstack_copy (&cond_obstack, &cframe, sizeof (cframe)); + } /* if a valid identifyer name */ -void s_ifdef(arg) -int arg; -{ - register char *name; /* points to name of symbol */ - register struct symbol *symbolP; /* Points to symbol */ - struct conditional_frame cframe; - - SKIP_WHITESPACE(); /* Leading whitespace is part of operand. */ - name = input_line_pointer; - - if (!is_name_beginner(*name)) { - as_bad("invalid identifier for \".ifdef\""); - obstack_1grow(&cond_obstack, 0); - } else { - get_symbol_end(); - ++input_line_pointer; - symbolP = symbol_find(name); - - initialize_cframe(&cframe); - cframe.ignoring = cframe.dead_tree && !((symbolP != 0) ^ arg); - current_cframe = (struct conditional_frame *) obstack_copy(&cond_obstack, &cframe, sizeof(cframe)); - } /* if a valid identifyer name */ - - return; -} /* s_ifdef() */ - -void s_if(arg) -int arg; + return; +} /* s_ifdef() */ + +void +s_if (arg) + int arg; { - expressionS operand; - struct conditional_frame cframe; - - SKIP_WHITESPACE(); /* Leading whitespace is part of operand. */ - expr(0, &operand); - - if (operand.X_add_symbol != NULL - || operand.X_subtract_symbol != NULL) { - as_bad("non-constant expression in \".if\" statement"); - } /* bad condition */ - - /* If the above error is signaled, this will dispatch - using an undefined result. No big deal. */ - initialize_cframe(&cframe); - cframe.ignoring = cframe.dead_tree || !((operand.X_add_number != 0) ^ arg); - current_cframe = (struct conditional_frame *) obstack_copy(&cond_obstack, &cframe, sizeof(cframe)); - return; -} /* s_if() */ - -void s_endif(arg) -int arg; + expressionS operand; + struct conditional_frame cframe; + int t; + + SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */ + expression (&operand); + + if (operand.X_op != O_constant) + as_bad ("non-constant expression in \".if\" statement"); + + switch ((operatorT) arg) + { + case O_eq: t = operand.X_add_number == 0; break; + case O_ne: t = operand.X_add_number != 0; break; + case O_lt: t = operand.X_add_number < 0; break; + case O_le: t = operand.X_add_number <= 0; break; + case O_ge: t = operand.X_add_number >= 0; break; + case O_gt: t = operand.X_add_number > 0; break; + default: + abort (); + } + + /* If the above error is signaled, this will dispatch + using an undefined result. No big deal. */ + initialize_cframe (&cframe); + cframe.ignoring = cframe.dead_tree || ! t; + current_cframe = ((struct conditional_frame *) + obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); + return; +} /* s_if() */ + +/* Get a string for the MRI IFC or IFNC pseudo-ops. */ + +static char * +get_mri_string (terminator, len) + int terminator; + int *len; { - struct conditional_frame *hold; - - if (current_cframe == NULL) { - as_bad("\".endif\" without \".if\""); - } else { - hold = current_cframe; - current_cframe = current_cframe->previous_cframe; - obstack_free(&cond_obstack, hold); - } /* if one pop too many */ - - return; -} /* s_endif() */ - -void s_else(arg) -int arg; + char *ret; + char *s; + + SKIP_WHITESPACE (); + s = ret = input_line_pointer; + if (*input_line_pointer == '\'') + { + ++s; + ++input_line_pointer; + while (! is_end_of_line[(unsigned char) *input_line_pointer]) + { + *s++ = *input_line_pointer++; + if (s[-1] == '\'') + { + if (*input_line_pointer != '\'') + break; + ++input_line_pointer; + } + } + SKIP_WHITESPACE (); + } + else + { + while (*input_line_pointer != terminator + && ! is_end_of_line[(unsigned char) *input_line_pointer]) + ++input_line_pointer; + s = input_line_pointer; + while (s > ret && (s[-1] == ' ' || s[-1] == '\t')) + --s; + } + + *len = s - ret; + return ret; +} + +/* The MRI IFC and IFNC pseudo-ops. */ + +void +s_ifc (arg) + int arg; { - if (current_cframe == NULL) { - as_bad(".else without matching .if - ignored"); - - } else if (current_cframe->else_seen) { - struct file_line hold; - as_bad("duplicate \"else\" - ignored"); - - get_file_line(&hold); - set_file_line(¤t_cframe->else_file_line); - as_bad("here is the previous \"else\"."); - set_file_line(¤t_cframe->if_file_line); - as_bad("here is the matching \".if\"."); - set_file_line(&hold); - - } else { - get_file_line(¤t_cframe->else_file_line); - - if (!current_cframe->dead_tree) { - current_cframe->ignoring = !current_cframe->ignoring; - } /* if not a dead tree */ - - current_cframe->else_seen = 1; - } /* if error else do it */ - - return; -} /* s_else() */ - -void s_ifeqs(arg) -int arg; + char *s1, *s2; + int len1, len2; + int res; + struct conditional_frame cframe; + + s1 = get_mri_string (',', &len1); + + if (*input_line_pointer != ',') + as_bad ("bad format for ifc or ifnc"); + else + ++input_line_pointer; + + s2 = get_mri_string (';', &len2); + + res = len1 == len2 && strncmp (s1, s2, len1) == 0; + + initialize_cframe (&cframe); + cframe.ignoring = cframe.dead_tree || ! (res ^ arg); + current_cframe = ((struct conditional_frame *) + obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); +} + +void +s_endif (arg) + int arg; { - as_bad("ifeqs not implemented."); - - return; -} /* s_ifeqs() */ + struct conditional_frame *hold; -void s_end(arg) -int arg; + if (current_cframe == NULL) + { + as_bad ("\".endif\" without \".if\""); + } + else + { + hold = current_cframe; + current_cframe = current_cframe->previous_cframe; + obstack_free (&cond_obstack, hold); + } /* if one pop too many */ + + return; +} /* s_endif() */ + +void +s_else (arg) + int arg; { - return; -} /* s_end() */ - -int ignore_input() { - char *ptr = obstack_next_free (&cond_obstack); - - /* We cannot ignore certain pseudo ops. */ - if (input_line_pointer[-1] == '.' - && ((input_line_pointer[0] == 'i' - && (!strncmp (input_line_pointer, "if", 2) - || !strncmp (input_line_pointer, "ifdef", 5) - || !strncmp (input_line_pointer, "ifndef", 6))) - || (input_line_pointer[0] == 'e' - && (!strncmp (input_line_pointer, "else", 4) - || !strncmp (input_line_pointer, "endif", 5))))) { - return 0; - } - - return((current_cframe != NULL) && (current_cframe->ignoring)); -} /* ignore_input() */ + if (current_cframe == NULL) + { + as_bad (".else without matching .if - ignored"); + + } + else if (current_cframe->else_seen) + { + as_bad ("duplicate \"else\" - ignored"); + as_bad_where (current_cframe->else_file_line.file, + current_cframe->else_file_line.line, + "here is the previous \"else\""); + as_bad_where (current_cframe->if_file_line.file, + current_cframe->if_file_line.line, + "here is the previous \"if\""); + } + else + { + as_where (¤t_cframe->else_file_line.file, + ¤t_cframe->else_file_line.line); + + if (!current_cframe->dead_tree) + { + current_cframe->ignoring = !current_cframe->ignoring; + } /* if not a dead tree */ -static void initialize_cframe(cframe) -struct conditional_frame *cframe; + current_cframe->else_seen = 1; + } /* if error else do it */ + + return; +} /* s_else() */ + +void +s_ifeqs (arg) + int arg; { - memset(cframe, 0, sizeof(*cframe)); - get_file_line(&(cframe->if_file_line)); - cframe->previous_cframe = current_cframe; - cframe->dead_tree = current_cframe != NULL && current_cframe->ignoring; - - return; -} /* initialize_cframe() */ - -static void get_file_line(into) -struct file_line *into; + as_bad ("ifeqs not implemented."); + + return; +} /* s_ifeqs() */ + +int +ignore_input () { - extern char *logical_input_file; - extern char *physical_input_file; - extern int logical_input_line; - extern int physical_input_line; - - into->logical_file = logical_input_file; - into->logical_line = logical_input_line; - into->physical_file = physical_input_file; - into->physical_line = physical_input_line; - - return; -} /* get_file_line() */ - -static void set_file_line(from) -struct file_line *from; + char *s; + + s = input_line_pointer; + + if (flag_mri +#ifdef NO_PSEUDO_DOT + || 1 +#endif + ) + { + if (s[-1] != '.') + --s; + } + else + { + if (s[-1] != '.') + return (current_cframe != NULL) && (current_cframe->ignoring); + } + + /* We cannot ignore certain pseudo ops. */ + if ((s[0] == 'i' + && (!strncmp (s, "if", 2) + || !strncmp (s, "ifdef", 5) + || !strncmp (s, "ifndef", 6))) + || (s[0] == 'e' + && (!strncmp (s, "else", 4) + || !strncmp (s, "endif", 5) + || !strncmp (s, "endc", 4)))) + return 0; + + return (current_cframe != NULL) && (current_cframe->ignoring); +} /* ignore_input() */ + +static void +initialize_cframe (cframe) + struct conditional_frame *cframe; { - extern char *logical_input_file; - extern char *physical_input_file; - extern int logical_input_line; - extern int physical_input_line; - - logical_input_file = from->logical_file; - logical_input_line = from->logical_line; - physical_input_file = from->physical_file; - physical_input_line = from->physical_line; - return; -} /* set_file_line() */ + memset (cframe, 0, sizeof (*cframe)); + as_where (&cframe->if_file_line.file, + &cframe->if_file_line.line); + cframe->previous_cframe = current_cframe; + cframe->dead_tree = current_cframe != NULL && current_cframe->ignoring; + + return; +} /* initialize_cframe() */ /* * Local Variables: |