PR middle-end/78786 - GCC hangs/out of memory calling sprintf with large precision
gcc/ChangeLog: PR middle-end/78786 * gimple-ssa-sprintf.c (target_dir_max): New macro. (get_mpfr_format_length): New function. (format_integer): Use HOST_WIDE_INT instead of int. (format_floating_max): Same. (format_floating): Call get_mpfr_format_length. (format_directive): Use target_dir_max. gcc/testsuite/ChangeLog: PR middle-end/78786 * gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: New test. From-SVN: r243672
This commit is contained in:
Martin Sebor
Martin Sebor
parent
8000827901
commit
cfce1a4a42
@ -1,3 +1,13 @@
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2016-12-14 Martin Sebor <msebor@redhat.com>
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PR middle-end/78786
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* gimple-ssa-sprintf.c (target_dir_max): New macro.
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(get_mpfr_format_length): New function.
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(format_integer): Use HOST_WIDE_INT instead of int.
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(format_floating_max): Same.
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(format_floating): Call get_mpfr_format_length.
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(format_directive): Use target_dir_max.
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2016-12-14 Jakub Jelinek <jakub@redhat.com>
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PR target/78791
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@ -84,6 +84,12 @@ along with GCC; see the file COPYING3. If not see
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to be used for optimization but it's good enough as is for warnings. */
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#define target_mb_len_max 6
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/* The maximum number of bytes a single non-string directive can result
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in. This is the result of printf("%.*Lf", INT_MAX, -LDBL_MAX) for
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LDBL_MAX_10_EXP of 4932. */
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#define IEEE_MAX_10_EXP 4932
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#define target_dir_max() (target_int_max () + IEEE_MAX_10_EXP + 2)
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namespace {
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const pass_data pass_data_sprintf_length = {
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@ -989,7 +995,7 @@ format_integer (const conversion_spec &spec, tree arg)
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gcc_unreachable ();
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}
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int len;
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HOST_WIDE_INT len;
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if ((prec == HOST_WIDE_INT_MIN || prec == 0) && integer_zerop (arg))
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{
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@ -1214,11 +1220,73 @@ format_integer (const conversion_spec &spec, tree arg)
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return res;
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}
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/* Return the number of bytes that a format directive consisting of FLAGS,
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PRECision, format SPECification, and MPFR rounding specifier RNDSPEC,
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would result for argument X under ideal conditions (i.e., if PREC
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weren't excessive). MPFR 3.1 allocates large amounts of memory for
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values of PREC with large magnitude and can fail (see MPFR bug #21056).
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This function works around those problems. */
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static unsigned HOST_WIDE_INT
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get_mpfr_format_length (mpfr_ptr x, const char *flags, HOST_WIDE_INT prec,
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char spec, char rndspec)
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{
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char fmtstr[40];
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HOST_WIDE_INT len = strlen (flags);
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fmtstr[0] = '%';
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memcpy (fmtstr + 1, flags, len);
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memcpy (fmtstr + 1 + len, ".*R", 3);
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fmtstr[len + 4] = rndspec;
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fmtstr[len + 5] = spec;
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fmtstr[len + 6] = '\0';
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/* Avoid passing negative precisions with larger magnitude to MPFR
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to avoid exposing its bugs. (A negative precision is supposed
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to be ignored.) */
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if (prec < 0)
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prec = -1;
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HOST_WIDE_INT p = prec;
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if (TOUPPER (spec) == 'G')
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{
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/* For G/g, precision gives the maximum number of significant
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digits which is bounded by LDBL_MAX_10_EXP, or, for a 128
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bit IEEE extended precision, 4932. Using twice as much
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here should be more than sufficient for any real format. */
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if ((IEEE_MAX_10_EXP * 2) < prec)
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prec = IEEE_MAX_10_EXP * 2;
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p = prec;
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}
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else
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{
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/* Cap precision arbitrarily at 1KB and add the difference
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(if any) to the MPFR result. */
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if (1024 < prec)
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p = 1024;
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}
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len = mpfr_snprintf (NULL, 0, fmtstr, (int)p, x);
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/* Handle the unlikely (impossible?) error by returning more than
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the maximum dictated by the function's return type. */
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if (len < 0)
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return target_dir_max () + 1;
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/* Adjust the return value by the difference. */
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if (p < prec)
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len += prec - p;
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return len;
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}
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/* Return the number of bytes to format using the format specifier
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SPEC the largest value in the real floating TYPE. */
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static int
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format_floating_max (tree type, char spec, int prec = -1)
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static unsigned HOST_WIDE_INT
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format_floating_max (tree type, char spec, HOST_WIDE_INT prec)
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{
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machine_mode mode = TYPE_MODE (type);
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@ -1243,21 +1311,8 @@ format_floating_max (tree type, char spec, int prec = -1)
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mpfr_init2 (x, rfmt->p);
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mpfr_from_real (x, &rv, GMP_RNDN);
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int n;
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if (-1 < prec)
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{
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const char fmt[] = { '%', '.', '*', 'R', spec, '\0' };
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n = mpfr_snprintf (NULL, 0, fmt, prec, x);
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}
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else
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{
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const char fmt[] = { '%', 'R', spec, '\0' };
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n = mpfr_snprintf (NULL, 0, fmt, x);
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}
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/* Return a value one greater to account for the leading minus sign. */
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return n + 1;
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return 1 + get_mpfr_format_length (x, "", prec, spec, 'D');
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}
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/* Return a range representing the minimum and maximum number of bytes
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@ -1266,7 +1321,8 @@ format_floating_max (tree type, char spec, int prec = -1)
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is used when the directive argument or its value isn't known. */
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static fmtresult
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format_floating (const conversion_spec &spec, int width, int prec)
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format_floating (const conversion_spec &spec, HOST_WIDE_INT width,
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HOST_WIDE_INT prec)
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{
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tree type;
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bool ldbl = false;
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@ -1357,7 +1413,7 @@ format_floating (const conversion_spec &spec, int width, int prec)
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res.range.min = 2 + (prec < 0 ? 6 : prec);
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/* Compute the maximum just once. */
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const int f_max[] = {
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const HOST_WIDE_INT f_max[] = {
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format_floating_max (double_type_node, 'f', prec),
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format_floating_max (long_double_type_node, 'f', prec)
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};
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@ -1372,10 +1428,10 @@ format_floating (const conversion_spec &spec, int width, int prec)
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case 'g':
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{
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/* The minimum is the same as for '%F'. */
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res.range.min = 2 + (prec < 0 ? 6 : prec);
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res.range.min = 1;
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/* Compute the maximum just once. */
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const int g_max[] = {
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const HOST_WIDE_INT g_max[] = {
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format_floating_max (double_type_node, 'g', prec),
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format_floating_max (long_double_type_node, 'g', prec)
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};
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@ -1412,8 +1468,8 @@ format_floating (const conversion_spec &spec, tree arg)
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/* Set WIDTH to -1 when it's not specified, to INT_MIN when it is
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specified by the asterisk to an unknown value, and otherwise to
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a non-negative value corresponding to the specified width. */
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int width = -1;
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int prec = -1;
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HOST_WIDE_INT width = -1;
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HOST_WIDE_INT prec = -1;
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/* The minimum and maximum number of bytes produced by the directive. */
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fmtresult res;
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@ -1473,29 +1529,12 @@ format_floating (const conversion_spec &spec, tree arg)
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char fmtstr [40];
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char *pfmt = fmtstr;
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*pfmt++ = '%';
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/* Append flags. */
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for (const char *pf = "-+ #0"; *pf; ++pf)
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if (spec.get_flag (*pf))
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*pfmt++ = *pf;
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/* Append width when specified and precision. */
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if (-1 < width)
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pfmt += sprintf (pfmt, "%i", width);
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if (-1 < prec)
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pfmt += sprintf (pfmt, ".%i", prec);
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/* Append the MPFR 'R' floating type specifier (no length modifier
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is necessary or allowed by MPFR for mpfr_t values). */
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*pfmt++ = 'R';
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/* Save the position of the MPFR rounding specifier and skip over
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it. It will be set in each iteration in the loop below. */
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char* const rndspec = pfmt++;
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/* Append the C type specifier and nul-terminate. */
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*pfmt++ = spec.specifier;
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*pfmt = '\0';
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for (int i = 0; i != sizeof minmax / sizeof *minmax; ++i)
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@ -1503,11 +1542,17 @@ format_floating (const conversion_spec &spec, tree arg)
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/* Use the MPFR rounding specifier to round down in the first
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iteration and then up. In most but not all cases this will
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result in the same number of bytes. */
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*rndspec = "DU"[i];
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char rndspec = "DU"[i];
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/* Format it and store the result in the corresponding
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member of the result struct. */
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*minmax[i] = mpfr_snprintf (NULL, 0, fmtstr, mpfrval);
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/* Format it and store the result in the corresponding member
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of the result struct. */
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unsigned HOST_WIDE_INT len
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= get_mpfr_format_length (mpfrval, fmtstr, prec,
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spec.specifier, rndspec);
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if (0 < width && len < (unsigned)width)
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len = width;
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*minmax[i] = len;
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}
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/* The range of output is known even if the result isn't bounded. */
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@ -1834,9 +1879,13 @@ format_directive (const pass_sprintf_length::call_info &info,
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if (!fmtres.knownrange)
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{
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/* Only when the range is known, check it against the host value
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of INT_MAX. Otherwise the range doesn't correspond to known
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values of the argument. */
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if (fmtres.range.max >= target_int_max ())
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of INT_MAX + (the number of bytes of the "%.*Lf" directive with
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INT_MAX precision, which is the longest possible output of any
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single directive). That's the largest valid byte count (though
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not valid call to a printf-like function because it can never
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return such a count). Otherwise, the range doesn't correspond
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to known values of the argument. */
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if (fmtres.range.max > target_dir_max ())
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{
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/* Normalize the MAX counter to avoid having to deal with it
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later. The counter can be less than HOST_WIDE_INT_M1U
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@ -1850,7 +1899,7 @@ format_directive (const pass_sprintf_length::call_info &info,
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res->number_chars = HOST_WIDE_INT_M1U;
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}
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if (fmtres.range.min >= target_int_max ())
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if (fmtres.range.min > target_dir_max ())
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{
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/* Disable exact length checking after a failure to determine
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even the minimum number of characters (it shouldn't happen
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@ -1,3 +1,8 @@
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2016-12-14 Martin Sebor <msebor@redhat.com>
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PR middle-end/78786
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* gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: New test.
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2016-12-14 Jakub Jelinek <jakub@redhat.com>
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PR target/78791
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183
gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-7.c
Normal file
183
gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-7.c
Normal file
@ -0,0 +1,183 @@
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/* PR middle-end/78786 - GCC hangs/out of memory calling sprintf with large
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precision
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{ dg-do compile }
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{ dg-require-effective-target int32plus }
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{ dg-options "-Wformat-length -ftrack-macro-expansion=0" } */
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#define INT_MAX __INT_MAX__
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#define INT_MIN (-INT_MAX - 1)
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typedef __SIZE_TYPE__ size_t;
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void sink (int, void*);
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char buf [1];
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#define T(n, fmt, ...) \
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sink (__builtin_sprintf (buf + sizeof buf - n, fmt, __VA_ARGS__), buf)
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void test_integer_cst (void)
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{
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T (0, "%*d", INT_MIN, 0); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*d", INT_MAX, 0); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*d", INT_MIN, 0); /* { dg-warning "writing 1 byte" } */
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T (0, "%.*d", INT_MAX, 0); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%*.*d", INT_MIN, INT_MIN, 0); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*d", INT_MAX, INT_MAX, 0); /* { dg-warning "writing 2147483647 bytes" } */
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}
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void test_integer_var (int i)
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{
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T (0, "%*d", INT_MIN, i); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*d", INT_MAX, i); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*d", INT_MIN, i); /* { dg-warning "writing between 1 and 11 bytes" } */
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T (0, "%.*d", INT_MAX, i); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%*.*d", INT_MIN, INT_MIN, i); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*d", INT_MAX, INT_MAX, i); /* { dg-warning "writing 2147483647 bytes" } */
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}
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void test_floating_a_cst (void)
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{
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T (0, "%*a", INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*a", INT_MAX, 0.); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*a", INT_MIN, 0.); /* { dg-warning "writing 6 bytes" } */
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T (0, "%.*a", INT_MAX, 0.); /* { dg-warning "writing 2147483654 bytes" } */
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T (0, "%*.*a", INT_MIN, INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*a", INT_MAX, INT_MAX, 0.); /* { dg-warning "writing 2147483654 bytes" } */
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}
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void test_floating_a_var (double x)
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{
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T (0, "%*a", INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*a", INT_MAX, x); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*a", INT_MIN, x); /* { dg-warning "writing between 6 and 24 bytes" } */
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T (0, "%.*a", INT_MAX, x); /* { dg-warning "writing between 2147483653 and 2147483658 bytes" } */
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T (0, "%*.*a", INT_MIN, INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*a", INT_MAX, INT_MAX, x); /* { dg-warning "writing between 2147483653 and 2147483658 bytes" } */
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}
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void test_floating_e_cst (void)
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{
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T (0, "%*e", INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*e", INT_MAX, 0.); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*e", INT_MIN, 0.); /* { dg-warning "writing 5 bytes" } */
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T (0, "%.*e", INT_MAX, 0.); /* { dg-warning "writing 2147483653 bytes" } */
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T (0, "%*.*e", INT_MIN, INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*e", INT_MAX, INT_MAX, 0.); /* { dg-warning "writing 2147483653 bytes" } */
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}
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void test_floating_e_var (double x)
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{
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T (0, "%*e", INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*e", INT_MAX, x); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*e", INT_MIN, x); /* { dg-warning "writing between 12 and 14 bytes" } */
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T (0, "%.*e", INT_MAX, x); /* { dg-warning "writing between 2147483653 and 2147483655 bytes" } */
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T (0, "%*.*e", INT_MIN, INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*e", INT_MAX, INT_MAX, x); /* { dg-warning "writing between 2147483653 and 2147483655 bytes" } */
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}
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void test_floating_f_cst (void)
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{
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T (0, "%*f", INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*f", INT_MAX, 0.); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*f", INT_MIN, 0.); /* { dg-warning "writing 1 byte" } */
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T (0, "%.*f", INT_MAX, 0.); /* { dg-warning "writing 2147483649 bytes" } */
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T (0, "%*.*f", INT_MIN, INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*f", INT_MAX, INT_MAX, 0.); /* { dg-warning "writing 2147483649 bytes" } */
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}
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void test_floating_f_var (double x)
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{
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T (0, "%*f", INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*f", INT_MAX, x); /* { dg-warning "writing 2147483647 bytes" } */
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T (0, "%.*f", INT_MIN, x); /* { dg-warning "writing between 8 and 317 bytes" } */
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T (0, "%.*f", INT_MAX, x); /* { dg-warning "writing between 2147483649 and 2147483958 bytes" } */
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T (0, "%*.*f", INT_MIN, INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*.*f", INT_MAX, INT_MAX, x); /* { dg-warning "writing between 2147483649 and 2147483958 bytes" } */
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}
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void test_floating_g_cst (void)
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{
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T (0, "%*g", INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
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T (0, "%*g", INT_MAX, 0.); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
|
||||
T (0, "%.*g", INT_MIN, 0.); /* { dg-warning "writing 1 byte" } */
|
||||
|
||||
T (0, "%.*g", INT_MAX, 0.); /* { dg-warning "writing 1 byte" } */
|
||||
|
||||
T (0, "%*.*g", INT_MIN, INT_MIN, 0.); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
|
||||
T (0, "%*.*g", INT_MAX, INT_MAX, 0.); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
}
|
||||
|
||||
void test_floating_g (double x)
|
||||
{
|
||||
T (0, "%*g", INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
T (0, "%*g", INT_MAX, x); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
|
||||
T (0, "%.*g", INT_MIN, x); /* { dg-warning "writing between 1 and 13 bytes" } */
|
||||
|
||||
T (0, "%.*g", INT_MAX, x); /* { dg-warning "writing between 1 and 310 bytes" } */
|
||||
|
||||
T (0, "%*.*g", INT_MIN, INT_MIN, x); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
|
||||
T (0, "%*.*g", INT_MAX, INT_MAX, x); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
}
|
||||
|
||||
void test_string_cst (void)
|
||||
{
|
||||
T (0, "%*s", INT_MIN, ""); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
T (0, "%*s", INT_MAX, ""); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
|
||||
T (0, "%.*s", INT_MIN, ""); /* { dg-warning "writing a terminating nul" } */
|
||||
|
||||
T (0, "%.*s", INT_MAX, ""); /* { dg-warning "writing a terminating nul" } */
|
||||
|
||||
T (0, "%*.*s", INT_MIN, INT_MIN, ""); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
|
||||
T (0, "%*.*s", INT_MAX, INT_MAX, ""); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
}
|
||||
|
||||
void test_string_var (const char *s)
|
||||
{
|
||||
T (0, "%*s", INT_MIN, s); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
T (0, "%*s", INT_MAX, s); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
|
||||
T (0, "%.*s", INT_MIN, s); /* { dg-warning "writing a terminating nul" } */
|
||||
|
||||
T (0, "%.*s", INT_MAX, s); /* { dg-warning "writing between 0 and 2147483647 bytes" } */
|
||||
|
||||
T (0, "%*.*s", INT_MIN, INT_MIN, s); /* { dg-warning "writing 2147483648 bytes" } */
|
||||
|
||||
T (0, "%*.*s", INT_MAX, INT_MAX, s); /* { dg-warning "writing 2147483647 bytes" } */
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user