From: Jakub Jelinek Date: Mon, 11 Sep 2023 09:08:41 +0000 (+0200) Subject: pretty-print: Fix up pp_wide_int [PR111329] X-Git-Tag: basepoints/gcc-15~6303 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f7f728746818062c3d6ed7ea9c7cb1562f2acb1;p=thirdparty%2Fgcc.git pretty-print: Fix up pp_wide_int [PR111329] The recent pp_wide_int changes for _BitInt support (because not all wide_ints fit into the small fixed size digit_buffer anymore) apparently broke +FAIL: gcc.dg/analyzer/out-of-bounds-diagram-1-debug.c (test for excess errors) +FAIL: gcc.dg/analyzer/out-of-bounds-diagram-1-debug.c 2 blank line(s) in output +FAIL: gcc.dg/analyzer/out-of-bounds-diagram-1-debug.c expected multiline pattern lines 17-39 (and I couldn't reproduce that in bisect seed (which is -O0 compiled) and thought it would be some analyzer diagnostic bug). The problem is that analyzer uses pp_wide_int with a function call in the second argument. Previously, when pp_wide_int macro just did print_dec (W, pp_buffer (PP)->digit_buffer, SGN); pp_string (PP, pp_buffer (PP)->digit_buffer); it worked, because the const wide_int_ref & first argument to print_dec bound to a temporary, which was only destructed at the end of the full statement after print_dec was called. But with my changes where I need to first compare the precision of the const wide_int_ref & to decide whether to use digit_buffer or XALLOCAVEC something larger, this means that pp_wide_int_ref binds to a temporary which is destroyed at the end of full statement which is the const wide_int_ref &pp_wide_int_ref = (W); declaration, so then invokes UB accessing a destructed temporary. The following patch fixes it by rewriting pp_wide_int into an inline function, so that the end of the full statement is the end of the inline function call. As functions using alloca aren't normally inlined, I've also split that part into a separate out of line function. Putting that into pretty-print.cc didn't work, e.g. the gm2 binary doesn't link, because pretty-print.o is in libcommon.a, but wide-print-print.o which defines print_dec is not. So I've put that out of line function into wide-int-print.cc instead. 2023-09-11 Jakub Jelinek PR middle-end/111329 * pretty-print.h (pp_wide_int): Rewrite from macro into inline function. For printing values which don't fit into digit_buffer use out-of-line function. * wide-int-print.h (pp_wide_int_large): Declare. * wide-int-print.cc: Include pretty-print.h. (pp_wide_int_large): Define. --- diff --git a/gcc/pretty-print.h b/gcc/pretty-print.h index 6eb99b1f6901..0d9bc991a5ad 100644 --- a/gcc/pretty-print.h +++ b/gcc/pretty-print.h @@ -333,28 +333,6 @@ pp_get_prefix (const pretty_printer *pp) { return pp->prefix; } #define pp_decimal_int(PP, I) pp_scalar (PP, "%d", I) #define pp_unsigned_wide_integer(PP, I) \ pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I) -#define pp_wide_int(PP, W, SGN) \ - do \ - { \ - const wide_int_ref &pp_wide_int_ref = (W); \ - unsigned int pp_wide_int_prec \ - = pp_wide_int_ref.get_precision (); \ - if ((pp_wide_int_prec + 3) / 4 \ - > sizeof (pp_buffer (PP)->digit_buffer) - 3) \ - { \ - char *pp_wide_int_buf \ - = XALLOCAVEC (char, (pp_wide_int_prec + 3) / 4 + 3);\ - print_dec (pp_wide_int_ref, pp_wide_int_buf, SGN); \ - pp_string (PP, pp_wide_int_buf); \ - } \ - else \ - { \ - print_dec (pp_wide_int_ref, \ - pp_buffer (PP)->digit_buffer, SGN); \ - pp_string (PP, pp_buffer (PP)->digit_buffer); \ - } \ - } \ - while (0) #define pp_vrange(PP, R) \ do \ { \ @@ -453,6 +431,19 @@ pp_wide_integer (pretty_printer *pp, HOST_WIDE_INT i) pp_scalar (pp, HOST_WIDE_INT_PRINT_DEC, i); } +inline void +pp_wide_int (pretty_printer *pp, const wide_int_ref &w, signop sgn) +{ + unsigned int prec = w.get_precision (); + if (UNLIKELY ((prec + 3) / 4 > sizeof (pp_buffer (pp)->digit_buffer) - 3)) + pp_wide_int_large (pp, w, sgn); + else + { + print_dec (w, pp_buffer (pp)->digit_buffer, sgn); + pp_string (pp, pp_buffer (pp)->digit_buffer); + } +} + template void pp_wide_integer (pretty_printer *pp, const poly_int_pod &); diff --git a/gcc/wide-int-print.cc b/gcc/wide-int-print.cc index a09ba024909c..f3a18711e29d 100644 --- a/gcc/wide-int-print.cc +++ b/gcc/wide-int-print.cc @@ -21,6 +21,7 @@ along with GCC; see the file COPYING3. If not see #include "config.h" #include "system.h" #include "coretypes.h" +#include "pretty-print.h" /* * public printing routines. @@ -138,3 +139,14 @@ print_hex (const wide_int_ref &wi, FILE *file) fputs (buf, file); } +/* Print larger precision wide_int. Not defined as inline in a header + together with pp_wide_int because XALLOCAVEC will make it uninlinable. */ + +void +pp_wide_int_large (pretty_printer *pp, const wide_int_ref &w, signop sgn) +{ + unsigned int prec = w.get_precision (); + char *buf = XALLOCAVEC (char, (prec + 3) / 4 + 3); + print_dec (w, buf, sgn); + pp_string (pp, buf); +} diff --git a/gcc/wide-int-print.h b/gcc/wide-int-print.h index 6d5fe7ad11ca..5aca0374d451 100644 --- a/gcc/wide-int-print.h +++ b/gcc/wide-int-print.h @@ -34,5 +34,6 @@ extern void print_decu (const wide_int_ref &wi, char *buf); extern void print_decu (const wide_int_ref &wi, FILE *file); extern void print_hex (const wide_int_ref &wi, char *buf); extern void print_hex (const wide_int_ref &wi, FILE *file); +extern void pp_wide_int_large (pretty_printer *, const wide_int_ref &, signop); #endif /* WIDE_INT_PRINT_H */