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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [fortran/] [error.c] - Rev 318
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/* Handle errors. Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010 Free Software Foundation, Inc. Contributed by Andy Vaught & Niels Kristian Bech Jensen This file is part of GCC. GCC 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 3, or (at your option) any later version. GCC 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 GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ /* Handle the inevitable errors. A major catch here is that things flagged as errors in one match subroutine can conceivably be legal elsewhere. This means that error messages are recorded and saved for possible use later. If a line does not match a legal construction, then the saved error message is reported. */ #include "config.h" #include "system.h" #include "flags.h" #include "gfortran.h" static int suppress_errors = 0; static int warnings_not_errors = 0; static int terminal_width, buffer_flag, errors, warnings; static gfc_error_buf error_buffer, warning_buffer, *cur_error_buffer; /* Go one level deeper suppressing errors. */ void gfc_push_suppress_errors (void) { gcc_assert (suppress_errors >= 0); ++suppress_errors; } /* Leave one level of error suppressing. */ void gfc_pop_suppress_errors (void) { gcc_assert (suppress_errors > 0); --suppress_errors; } /* Per-file error initialization. */ void gfc_error_init_1 (void) { terminal_width = gfc_terminal_width (); errors = 0; warnings = 0; buffer_flag = 0; } /* Set the flag for buffering errors or not. */ void gfc_buffer_error (int flag) { buffer_flag = flag; } /* Add a single character to the error buffer or output depending on buffer_flag. */ static void error_char (char c) { if (buffer_flag) { if (cur_error_buffer->index >= cur_error_buffer->allocated) { cur_error_buffer->allocated = cur_error_buffer->allocated ? cur_error_buffer->allocated * 2 : 1000; cur_error_buffer->message = XRESIZEVEC (char, cur_error_buffer->message, cur_error_buffer->allocated); } cur_error_buffer->message[cur_error_buffer->index++] = c; } else { if (c != 0) { /* We build up complete lines before handing things over to the library in order to speed up error printing. */ static char *line; static size_t allocated = 0, index = 0; if (index + 1 >= allocated) { allocated = allocated ? allocated * 2 : 1000; line = XRESIZEVEC (char, line, allocated); } line[index++] = c; if (c == '\n') { line[index] = '\0'; fputs (line, stderr); index = 0; } } } } /* Copy a string to wherever it needs to go. */ static void error_string (const char *p) { while (*p) error_char (*p++); } /* Print a formatted integer to the error buffer or output. */ #define IBUF_LEN 60 static void error_uinteger (unsigned long int i) { char *p, int_buf[IBUF_LEN]; p = int_buf + IBUF_LEN - 1; *p-- = '\0'; if (i == 0) *p-- = '0'; while (i > 0) { *p-- = i % 10 + '0'; i = i / 10; } error_string (p + 1); } static void error_integer (long int i) { unsigned long int u; if (i < 0) { u = (unsigned long int) -i; error_char ('-'); } else u = i; error_uinteger (u); } static void print_wide_char_into_buffer (gfc_char_t c, char *buf) { static const char xdigit[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; if (gfc_wide_is_printable (c)) { buf[1] = '\0'; buf[0] = (unsigned char) c; } else if (c < ((gfc_char_t) 1 << 8)) { buf[4] = '\0'; buf[3] = xdigit[c & 0x0F]; c = c >> 4; buf[2] = xdigit[c & 0x0F]; buf[1] = 'x'; buf[0] = '\\'; } else if (c < ((gfc_char_t) 1 << 16)) { buf[6] = '\0'; buf[5] = xdigit[c & 0x0F]; c = c >> 4; buf[4] = xdigit[c & 0x0F]; c = c >> 4; buf[3] = xdigit[c & 0x0F]; c = c >> 4; buf[2] = xdigit[c & 0x0F]; buf[1] = 'u'; buf[0] = '\\'; } else { buf[10] = '\0'; buf[9] = xdigit[c & 0x0F]; c = c >> 4; buf[8] = xdigit[c & 0x0F]; c = c >> 4; buf[7] = xdigit[c & 0x0F]; c = c >> 4; buf[6] = xdigit[c & 0x0F]; c = c >> 4; buf[5] = xdigit[c & 0x0F]; c = c >> 4; buf[4] = xdigit[c & 0x0F]; c = c >> 4; buf[3] = xdigit[c & 0x0F]; c = c >> 4; buf[2] = xdigit[c & 0x0F]; buf[1] = 'U'; buf[0] = '\\'; } } static char wide_char_print_buffer[11]; const char * gfc_print_wide_char (gfc_char_t c) { print_wide_char_into_buffer (c, wide_char_print_buffer); return wide_char_print_buffer; } /* Show the file, where it was included, and the source line, give a locus. Calls error_printf() recursively, but the recursion is at most one level deep. */ static void error_printf (const char *, ...) ATTRIBUTE_GCC_GFC(1,2); static void show_locus (locus *loc, int c1, int c2) { gfc_linebuf *lb; gfc_file *f; gfc_char_t c, *p; int i, offset, cmax; /* TODO: Either limit the total length and number of included files displayed or add buffering of arbitrary number of characters in error messages. */ /* Write out the error header line, giving the source file and error location (in GNU standard "[file]:[line].[column]:" format), followed by an "included by" stack and a blank line. This header format is matched by a testsuite parser defined in lib/gfortran-dg.exp. */ lb = loc->lb; f = lb->file; error_string (f->filename); error_char (':'); error_integer (LOCATION_LINE (lb->location)); if ((c1 > 0) || (c2 > 0)) error_char ('.'); if (c1 > 0) error_integer (c1); if ((c1 > 0) && (c2 > 0)) error_char ('-'); if (c2 > 0) error_integer (c2); error_char (':'); error_char ('\n'); for (;;) { i = f->inclusion_line; f = f->up; if (f == NULL) break; error_printf (" Included at %s:%d:", f->filename, i); } error_char ('\n'); /* Calculate an appropriate horizontal offset of the source line in order to get the error locus within the visible portion of the line. Note that if the margin of 5 here is changed, the corresponding margin of 10 in show_loci should be changed. */ offset = 0; /* If the two loci would appear in the same column, we shift '2' one column to the right, so as to print '12' rather than just '1'. We do this here so it will be accounted for in the margin calculations. */ if (c1 == c2) c2 += 1; cmax = (c1 < c2) ? c2 : c1; if (cmax > terminal_width - 5) offset = cmax - terminal_width + 5; /* Show the line itself, taking care not to print more than what can show up on the terminal. Tabs are converted to spaces, and nonprintable characters are converted to a "\xNN" sequence. */ /* TODO: Although setting i to the terminal width is clever, it fails to work correctly when nonprintable characters exist. A better solution should be found. */ p = &(lb->line[offset]); i = gfc_wide_strlen (p); if (i > terminal_width) i = terminal_width - 1; for (; i > 0; i--) { static char buffer[11]; c = *p++; if (c == '\t') c = ' '; print_wide_char_into_buffer (c, buffer); error_string (buffer); } error_char ('\n'); /* Show the '1' and/or '2' corresponding to the column of the error locus. Note that a value of -1 for c1 or c2 will simply cause the relevant number not to be printed. */ c1 -= offset; c2 -= offset; for (i = 0; i <= cmax; i++) { if (i == c1) error_char ('1'); else if (i == c2) error_char ('2'); else error_char (' '); } error_char ('\n'); } /* As part of printing an error, we show the source lines that caused the problem. We show at least one, and possibly two loci; the two loci may or may not be on the same source line. */ static void show_loci (locus *l1, locus *l2) { int m, c1, c2; if (l1 == NULL || l1->lb == NULL) { error_printf ("<During initialization>\n"); return; } /* While calculating parameters for printing the loci, we consider possible reasons for printing one per line. If appropriate, print the loci individually; otherwise we print them both on the same line. */ c1 = l1->nextc - l1->lb->line; if (l2 == NULL) { show_locus (l1, c1, -1); return; } c2 = l2->nextc - l2->lb->line; if (c1 < c2) m = c2 - c1; else m = c1 - c2; /* Note that the margin value of 10 here needs to be less than the margin of 5 used in the calculation of offset in show_locus. */ if (l1->lb != l2->lb || m > terminal_width - 10) { show_locus (l1, c1, -1); show_locus (l2, -1, c2); return; } show_locus (l1, c1, c2); return; } /* Workhorse for the error printing subroutines. This subroutine is inspired by g77's error handling and is similar to printf() with the following %-codes: %c Character, %d or %i Integer, %s String, %% Percent %L Takes locus argument %C Current locus (no argument) If a locus pointer is given, the actual source line is printed out and the column is indicated. Since we want the error message at the bottom of any source file information, we must scan the argument list twice -- once to determine whether the loci are present and record this for printing, and once to print the error message after and loci have been printed. A maximum of two locus arguments are permitted. This function is also called (recursively) by show_locus in the case of included files; however, as show_locus does not resupply any loci, the recursion is at most one level deep. */ #define MAX_ARGS 10 static void ATTRIBUTE_GCC_GFC(2,0) error_print (const char *type, const char *format0, va_list argp) { enum { TYPE_CURRENTLOC, TYPE_LOCUS, TYPE_INTEGER, TYPE_UINTEGER, TYPE_LONGINT, TYPE_ULONGINT, TYPE_CHAR, TYPE_STRING, NOTYPE }; struct { int type; int pos; union { int intval; unsigned int uintval; long int longintval; unsigned long int ulongintval; char charval; const char * stringval; } u; } arg[MAX_ARGS], spec[MAX_ARGS]; /* spec is the array of specifiers, in the same order as they appear in the format string. arg is the array of arguments, in the same order as they appear in the va_list. */ char c; int i, n, have_l1, pos, maxpos; locus *l1, *l2, *loc; const char *format; l1 = l2 = NULL; have_l1 = 0; pos = -1; maxpos = -1; n = 0; format = format0; for (i = 0; i < MAX_ARGS; i++) { arg[i].type = NOTYPE; spec[i].pos = -1; } /* First parse the format string for position specifiers. */ while (*format) { c = *format++; if (c != '%') continue; if (*format == '%') { format++; continue; } if (ISDIGIT (*format)) { /* This is a position specifier. For example, the number 12 in the format string "%12$d", which specifies the third argument of the va_list, formatted in %d format. For details, see "man 3 printf". */ pos = atoi(format) - 1; gcc_assert (pos >= 0); while (ISDIGIT(*format)) format++; gcc_assert (*format++ == '$'); } else pos++; c = *format++; if (pos > maxpos) maxpos = pos; switch (c) { case 'C': arg[pos].type = TYPE_CURRENTLOC; break; case 'L': arg[pos].type = TYPE_LOCUS; break; case 'd': case 'i': arg[pos].type = TYPE_INTEGER; break; case 'u': arg[pos].type = TYPE_UINTEGER; break; case 'l': c = *format++; if (c == 'u') arg[pos].type = TYPE_ULONGINT; else if (c == 'i' || c == 'd') arg[pos].type = TYPE_LONGINT; else gcc_unreachable (); break; case 'c': arg[pos].type = TYPE_CHAR; break; case 's': arg[pos].type = TYPE_STRING; break; default: gcc_unreachable (); } spec[n++].pos = pos; } /* Then convert the values for each %-style argument. */ for (pos = 0; pos <= maxpos; pos++) { gcc_assert (arg[pos].type != NOTYPE); switch (arg[pos].type) { case TYPE_CURRENTLOC: loc = &gfc_current_locus; /* Fall through. */ case TYPE_LOCUS: if (arg[pos].type == TYPE_LOCUS) loc = va_arg (argp, locus *); if (have_l1) { l2 = loc; arg[pos].u.stringval = "(2)"; } else { l1 = loc; have_l1 = 1; arg[pos].u.stringval = "(1)"; } break; case TYPE_INTEGER: arg[pos].u.intval = va_arg (argp, int); break; case TYPE_UINTEGER: arg[pos].u.uintval = va_arg (argp, unsigned int); break; case TYPE_LONGINT: arg[pos].u.longintval = va_arg (argp, long int); break; case TYPE_ULONGINT: arg[pos].u.ulongintval = va_arg (argp, unsigned long int); break; case TYPE_CHAR: arg[pos].u.charval = (char) va_arg (argp, int); break; case TYPE_STRING: arg[pos].u.stringval = (const char *) va_arg (argp, char *); break; default: gcc_unreachable (); } } for (n = 0; spec[n].pos >= 0; n++) spec[n].u = arg[spec[n].pos].u; /* Show the current loci if we have to. */ if (have_l1) show_loci (l1, l2); if (*type) { error_string (type); error_char (' '); } have_l1 = 0; format = format0; n = 0; for (; *format; format++) { if (*format != '%') { error_char (*format); continue; } format++; if (ISDIGIT (*format)) { /* This is a position specifier. See comment above. */ while (ISDIGIT (*format)) format++; /* Skip over the dollar sign. */ format++; } switch (*format) { case '%': error_char ('%'); break; case 'c': error_char (spec[n++].u.charval); break; case 's': case 'C': /* Current locus */ case 'L': /* Specified locus */ error_string (spec[n++].u.stringval); break; case 'd': case 'i': error_integer (spec[n++].u.intval); break; case 'u': error_uinteger (spec[n++].u.uintval); break; case 'l': format++; if (*format == 'u') error_uinteger (spec[n++].u.ulongintval); else error_integer (spec[n++].u.longintval); break; } } error_char ('\n'); } /* Wrapper for error_print(). */ static void error_printf (const char *gmsgid, ...) { va_list argp; va_start (argp, gmsgid); error_print ("", _(gmsgid), argp); va_end (argp); } /* Increment the number of errors, and check whether too many have been printed. */ static void gfc_increment_error_count (void) { errors++; if ((gfc_option.max_errors != 0) && (errors >= gfc_option.max_errors)) gfc_fatal_error ("Error count reached limit of %d.", gfc_option.max_errors); } /* Issue a warning. */ void gfc_warning (const char *gmsgid, ...) { va_list argp; if (inhibit_warnings) return; warning_buffer.flag = 1; warning_buffer.index = 0; cur_error_buffer = &warning_buffer; va_start (argp, gmsgid); error_print (_("Warning:"), _(gmsgid), argp); va_end (argp); error_char ('\0'); if (buffer_flag == 0) { warnings++; if (warnings_are_errors) gfc_increment_error_count(); } } /* Whether, for a feature included in a given standard set (GFC_STD_*), we should issue an error or a warning, or be quiet. */ notification gfc_notification_std (int std) { bool warning; warning = ((gfc_option.warn_std & std) != 0) && !inhibit_warnings; if ((gfc_option.allow_std & std) != 0 && !warning) return SILENT; return warning ? WARNING : ERROR; } /* Possibly issue a warning/error about use of a nonstandard (or deleted) feature. An error/warning will be issued if the currently selected standard does not contain the requested bits. Return FAILURE if an error is generated. */ gfc_try gfc_notify_std (int std, const char *gmsgid, ...) { va_list argp; bool warning; warning = ((gfc_option.warn_std & std) != 0) && !inhibit_warnings; if ((gfc_option.allow_std & std) != 0 && !warning) return SUCCESS; if (suppress_errors) return warning ? SUCCESS : FAILURE; cur_error_buffer = warning ? &warning_buffer : &error_buffer; cur_error_buffer->flag = 1; cur_error_buffer->index = 0; va_start (argp, gmsgid); if (warning) error_print (_("Warning:"), _(gmsgid), argp); else error_print (_("Error:"), _(gmsgid), argp); va_end (argp); error_char ('\0'); if (buffer_flag == 0) { if (warning && !warnings_are_errors) warnings++; else gfc_increment_error_count(); } return (warning && !warnings_are_errors) ? SUCCESS : FAILURE; } /* Immediate warning (i.e. do not buffer the warning). */ void gfc_warning_now (const char *gmsgid, ...) { va_list argp; int i; if (inhibit_warnings) return; i = buffer_flag; buffer_flag = 0; warnings++; va_start (argp, gmsgid); error_print (_("Warning:"), _(gmsgid), argp); va_end (argp); error_char ('\0'); if (warnings_are_errors) gfc_increment_error_count(); buffer_flag = i; } /* Clear the warning flag. */ void gfc_clear_warning (void) { warning_buffer.flag = 0; } /* Check to see if any warnings have been saved. If so, print the warning. */ void gfc_warning_check (void) { if (warning_buffer.flag) { warnings++; if (warning_buffer.message != NULL) fputs (warning_buffer.message, stderr); warning_buffer.flag = 0; } } /* Issue an error. */ void gfc_error (const char *gmsgid, ...) { va_list argp; if (warnings_not_errors) goto warning; if (suppress_errors) return; error_buffer.flag = 1; error_buffer.index = 0; cur_error_buffer = &error_buffer; va_start (argp, gmsgid); error_print (_("Error:"), _(gmsgid), argp); va_end (argp); error_char ('\0'); if (buffer_flag == 0) gfc_increment_error_count(); return; warning: if (inhibit_warnings) return; warning_buffer.flag = 1; warning_buffer.index = 0; cur_error_buffer = &warning_buffer; va_start (argp, gmsgid); error_print (_("Warning:"), _(gmsgid), argp); va_end (argp); error_char ('\0'); if (buffer_flag == 0) { warnings++; if (warnings_are_errors) gfc_increment_error_count(); } } /* Immediate error. */ void gfc_error_now (const char *gmsgid, ...) { va_list argp; int i; error_buffer.flag = 1; error_buffer.index = 0; cur_error_buffer = &error_buffer; i = buffer_flag; buffer_flag = 0; va_start (argp, gmsgid); error_print (_("Error:"), _(gmsgid), argp); va_end (argp); error_char ('\0'); gfc_increment_error_count(); buffer_flag = i; if (flag_fatal_errors) exit (1); } /* Fatal error, never returns. */ void gfc_fatal_error (const char *gmsgid, ...) { va_list argp; buffer_flag = 0; va_start (argp, gmsgid); error_print (_("Fatal Error:"), _(gmsgid), argp); va_end (argp); exit (3); } /* This shouldn't happen... but sometimes does. */ void gfc_internal_error (const char *format, ...) { va_list argp; buffer_flag = 0; va_start (argp, format); show_loci (&gfc_current_locus, NULL); error_printf ("Internal Error at (1):"); error_print ("", format, argp); va_end (argp); exit (ICE_EXIT_CODE); } /* Clear the error flag when we start to compile a source line. */ void gfc_clear_error (void) { error_buffer.flag = 0; warnings_not_errors = 0; } /* Tests the state of error_flag. */ int gfc_error_flag_test (void) { return error_buffer.flag; } /* Check to see if any errors have been saved. If so, print the error. Returns the state of error_flag. */ int gfc_error_check (void) { int rc; rc = error_buffer.flag; if (error_buffer.flag) { if (error_buffer.message != NULL) fputs (error_buffer.message, stderr); error_buffer.flag = 0; gfc_increment_error_count(); if (flag_fatal_errors) exit (1); } return rc; } /* Save the existing error state. */ void gfc_push_error (gfc_error_buf *err) { err->flag = error_buffer.flag; if (error_buffer.flag) err->message = xstrdup (error_buffer.message); error_buffer.flag = 0; } /* Restore a previous pushed error state. */ void gfc_pop_error (gfc_error_buf *err) { error_buffer.flag = err->flag; if (error_buffer.flag) { size_t len = strlen (err->message) + 1; gcc_assert (len <= error_buffer.allocated); memcpy (error_buffer.message, err->message, len); gfc_free (err->message); } } /* Free a pushed error state, but keep the current error state. */ void gfc_free_error (gfc_error_buf *err) { if (err->flag) gfc_free (err->message); } /* Report the number of warnings and errors that occurred to the caller. */ void gfc_get_errors (int *w, int *e) { if (w != NULL) *w = warnings; if (e != NULL) *e = errors; } /* Switch errors into warnings. */ void gfc_errors_to_warnings (int f) { warnings_not_errors = (f == 1) ? 1 : 0; }
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