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error.cc
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error.cc
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/* Handle errors.
Copyright (C) 2000-2024 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 "coretypes.h"
#include "options.h"
#include "gfortran.h"
#include "diagnostic.h"
#include "diagnostic-color.h"
#include "tree-diagnostic.h" /* tree_diagnostics_defaults */
static int suppress_errors = 0;
static bool warnings_not_errors = false;
static int terminal_width;
/* True if the error/warnings should be buffered. */
static bool buffered_p;
static gfc_error_buffer error_buffer;
/* These are always buffered buffers (.flush_p == false) to be used by
the pretty-printer. */
static output_buffer *pp_error_buffer, *pp_warning_buffer;
static int warningcount_buffered, werrorcount_buffered;
/* Return buffered_p. */
bool
gfc_buffered_p (void)
{
return buffered_p;
}
/* Return true if there output_buffer is empty. */
static bool
gfc_output_buffer_empty_p (const output_buffer * buf)
{
return output_buffer_last_position_in_text (buf) == NULL;
}
/* Go one level deeper suppressing errors. */
void
gfc_push_suppress_errors (void)
{
gcc_assert (suppress_errors >= 0);
++suppress_errors;
}
static void
gfc_error_opt (int opt, const char *gmsgid, va_list ap) ATTRIBUTE_GCC_GFC(2,0);
static bool
gfc_warning (int opt, const char *gmsgid, va_list ap) ATTRIBUTE_GCC_GFC(2,0);
/* Leave one level of error suppressing. */
void
gfc_pop_suppress_errors (void)
{
gcc_assert (suppress_errors > 0);
--suppress_errors;
}
/* Query whether errors are suppressed. */
bool
gfc_query_suppress_errors (void)
{
return suppress_errors > 0;
}
/* Determine terminal width (for trimming source lines in output). */
static int
gfc_get_terminal_width (void)
{
return isatty (STDERR_FILENO) ? get_terminal_width () : INT_MAX;
}
/* Per-file error initialization. */
void
gfc_error_init_1 (void)
{
terminal_width = gfc_get_terminal_width ();
gfc_buffer_error (false);
}
/* Set the flag for buffering errors or not. */
void
gfc_buffer_error (bool flag)
{
buffered_p = flag;
}
/* Add a single character to the error buffer or output depending on
buffered_p. */
static void
error_char (char)
{
/* FIXME: Unused function to be removed in a subsequent patch. */
}
/* 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 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 long int i)
{
unsigned long long int u;
if (i < 0)
{
u = (unsigned long long int) -i;
error_char ('-');
}
else
u = i;
error_uinteger (u);
}
static void
error_hwuint (unsigned HOST_WIDE_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_hwint (HOST_WIDE_INT i)
{
unsigned HOST_WIDE_INT u;
if (i < 0)
{
u = (unsigned HOST_WIDE_INT) -i;
error_char ('-');
}
else
u = i;
error_uinteger (u);
}
static size_t
gfc_widechar_display_length (gfc_char_t c)
{
if (gfc_wide_is_printable (c) || c == '\t')
/* Printable ASCII character, or tabulation (output as a space). */
return 1;
else if (c < ((gfc_char_t) 1 << 8))
/* Displayed as \x?? */
return 4;
else if (c < ((gfc_char_t) 1 << 16))
/* Displayed as \u???? */
return 6;
else
/* Displayed as \U???????? */
return 10;
}
/* Length of the ASCII representation of the wide string, escaping wide
characters as print_wide_char_into_buffer() does. */
static size_t
gfc_wide_display_length (const gfc_char_t *str)
{
size_t i, len;
for (i = 0, len = 0; str[i]; i++)
len += gfc_widechar_display_length (str[i]);
return len;
}
static int
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) || c == '\t')
{
buf[1] = '\0';
/* Tabulation is output as a space. */
buf[0] = (unsigned char) (c == '\t' ? ' ' : c);
return 1;
}
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] = '\\';
return 4;
}
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] = '\\';
return 6;
}
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] = '\\';
return 10;
}
}
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 *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. */
p = &(lb->line[offset]);
i = gfc_wide_display_length (p);
if (i > terminal_width)
i = terminal_width - 1;
while (i > 0)
{
static char buffer[11];
i -= print_wide_char_into_buffer (*p++, 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;
cmax -= offset;
p = &(lb->line[offset]);
for (i = 0; i < cmax; i++)
{
int spaces, j;
spaces = gfc_widechar_display_length (*p++);
if (i == c1)
error_char ('1'), spaces--;
else if (i == c2)
error_char ('2'), spaces--;
for (j = 0; j < spaces; j++)
error_char (' ');
}
if (i == c1)
error_char ('1');
else if (i == c2)
error_char ('2');
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_LLONGINT, TYPE_ULLONGINT,
TYPE_HWINT, TYPE_HWUINT, TYPE_CHAR, TYPE_STRING, TYPE_SIZE,
TYPE_SSIZE, TYPE_PTRDIFF, NOTYPE };
struct
{
int type;
int pos;
union
{
int intval;
unsigned int uintval;
long int longintval;
unsigned long int ulongintval;
long long int llongintval;
unsigned long long int ullongintval;
HOST_WIDE_INT hwintval;
unsigned HOST_WIDE_INT hwuintval;
char charval;
const char * stringval;
size_t sizeval;
ssize_t ssizeval;
ptrdiff_t ptrdiffval;
} 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;
loc = 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$d", which specifies the third
argument of the va_list, formatted in %d format.
For details, see "man 3 printf". */
pos = atoi(format) - 1;
gcc_assert (pos >= 0);
while (ISDIGIT(*format))
format++;
gcc_assert (*format == '$');
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 == 'l')
{
c = *format++;
if (c == 'u')
arg[pos].type = TYPE_ULLONGINT;
else if (c == 'i' || c == 'd')
arg[pos].type = TYPE_LLONGINT;
else
gcc_unreachable ();
}
else if (c == 'u')
arg[pos].type = TYPE_ULONGINT;
else if (c == 'i' || c == 'd')
arg[pos].type = TYPE_LONGINT;
else
gcc_unreachable ();
break;
case 'w':
c = *format++;
if (c == 'u')
arg[pos].type = TYPE_HWUINT;
else if (c == 'i' || c == 'd')
arg[pos].type = TYPE_HWINT;
else
gcc_unreachable ();
break;
case 'z':
c = *format++;
if (c == 'u')
arg[pos].type = TYPE_SIZE;
else if (c == 'i' || c == 'd')
arg[pos].type = TYPE_SSIZE;
else
gcc_unreachable ();
break;
case 't':
c = *format++;
if (c == 'u' || c == 'i' || c == 'd')
arg[pos].type = TYPE_PTRDIFF;
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)";
/* Point %C first offending character not the last good one. */
if (arg[pos].type == TYPE_CURRENTLOC && *l2->nextc != '\0')
l2->nextc++;
}
else
{
l1 = loc;
have_l1 = 1;
arg[pos].u.stringval = "(1)";
/* Point %C first offending character not the last good one. */
if (arg[pos].type == TYPE_CURRENTLOC && *l1->nextc != '\0')
l1->nextc++;
}
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_LLONGINT:
arg[pos].u.llongintval = va_arg (argp, long long int);
break;
case TYPE_ULLONGINT:
arg[pos].u.ullongintval = va_arg (argp, unsigned long long int);
break;
case TYPE_HWINT:
arg[pos].u.hwintval = va_arg (argp, HOST_WIDE_INT);
break;
case TYPE_HWUINT:
arg[pos].u.hwuintval = va_arg (argp, unsigned HOST_WIDE_INT);
break;
case TYPE_SSIZE:
arg[pos].u.ssizeval = va_arg (argp, ssize_t);
break;
case TYPE_SIZE:
arg[pos].u.sizeval = va_arg (argp, size_t);
break;
case TYPE_PTRDIFF:
arg[pos].u.ptrdiffval = va_arg (argp, ptrdiff_t);
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 == 'l')
{
format++;
if (*format == 'u')
error_uinteger (spec[n++].u.ullongintval);
else
error_integer (spec[n++].u.llongintval);
}
if (*format == 'u')
error_uinteger (spec[n++].u.ulongintval);
else
error_integer (spec[n++].u.longintval);
break;
case 'w':
format++;
if (*format == 'u')
error_hwuint (spec[n++].u.hwintval);
else
error_hwint (spec[n++].u.hwuintval);
break;
case 'z':
format++;
if (*format == 'u')
error_uinteger (spec[n++].u.sizeval);
else
error_integer (spec[n++].u.ssizeval);
break;
case 't':
format++;
if (*format == 'u')
{
unsigned long long a = spec[n++].u.ptrdiffval, m;
#ifdef PTRDIFF_MAX
m = PTRDIFF_MAX;
#else
m = INTTYPE_MAXIMUM (ptrdiff_t);
#endif
m = 2 * m + 1;
error_uinteger (a & m);
}
else
error_integer (spec[n++].u.ptrdiffval);
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);
}
/* Clear any output buffered in a pretty-print output_buffer. */
static void
gfc_clear_pp_buffer (output_buffer *this_buffer)
{
pretty_printer *pp = global_dc->printer;
output_buffer *tmp_buffer = pp_buffer (pp);
pp_buffer (pp) = this_buffer;
pp_clear_output_area (pp);
pp_buffer (pp) = tmp_buffer;
/* We need to reset last_location, otherwise we may skip caret lines
when we actually give a diagnostic. */
global_dc->m_last_location = UNKNOWN_LOCATION;
}
/* The currently-printing diagnostic, for use by gfc_format_decoder,
for colorizing %C and %L. */
static diagnostic_info *curr_diagnostic;
/* A helper function to call diagnostic_report_diagnostic, while setting
curr_diagnostic for the duration of the call. */
static bool
gfc_report_diagnostic (diagnostic_info *diagnostic)
{
gcc_assert (diagnostic != NULL);
curr_diagnostic = diagnostic;
bool ret = diagnostic_report_diagnostic (global_dc, diagnostic);
curr_diagnostic = NULL;
return ret;
}
/* This is just a helper function to avoid duplicating the logic of
gfc_warning. */
static bool
gfc_warning (int opt, const char *gmsgid, va_list ap)
{
va_list argp;
va_copy (argp, ap);
diagnostic_info diagnostic;
rich_location rich_loc (line_table, UNKNOWN_LOCATION);
bool fatal_errors = global_dc->m_fatal_errors;
pretty_printer *pp = global_dc->printer;
output_buffer *tmp_buffer = pp_buffer (pp);
gfc_clear_pp_buffer (pp_warning_buffer);
if (buffered_p)
{
pp_buffer (pp) = pp_warning_buffer;
global_dc->m_fatal_errors = false;
/* To prevent -fmax-errors= triggering. */
--werrorcount;
}
diagnostic_set_info (&diagnostic, gmsgid, &argp, &rich_loc,
DK_WARNING);
diagnostic.option_index = opt;
bool ret = gfc_report_diagnostic (&diagnostic);
if (buffered_p)
{
pp_buffer (pp) = tmp_buffer;
global_dc->m_fatal_errors = fatal_errors;
warningcount_buffered = 0;
werrorcount_buffered = 0;
/* Undo the above --werrorcount if not Werror, otherwise
werrorcount is correct already. */
if (!ret)
++werrorcount;
else if (diagnostic.kind == DK_ERROR)
++werrorcount_buffered;
else
++werrorcount, --warningcount, ++warningcount_buffered;
}