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From: David Malcolm <dmalcolm@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-4130] c, analyzer: fix ICE with -fanalyzer and -Wunused-macros [PR107711] Date: Thu, 17 Nov 2022 17:35:52 +0000 (GMT) [thread overview] Message-ID: <20221117173553.1EED43854550@sourceware.org> (raw) https://gcc.gnu.org/g:f9ed1d24ee46f5ca759c35a1f51fa163d7529ea6 commit r13-4130-gf9ed1d24ee46f5ca759c35a1f51fa163d7529ea6 Author: David Malcolm <dmalcolm@redhat.com> Date: Thu Nov 17 12:34:56 2022 -0500 c, analyzer: fix ICE with -fanalyzer and -Wunused-macros [PR107711] PR analyzer/107711 reports an ICE since r13-4073-gd8aba860b34203 with the combination of -fanalyzer and -Wunused-macros. The issue is that in c_translation_unit::consider_macro's call to cpp_create_reader I was passing "ident_hash" for use by the the new reader, but that takes ownership of that hash_table, so that ident_hash erroneously gets freed when c_translation_unit::consider_macro calls cpp_destroy, leading to a use-after-free in -Wunused-macros, where: (gdb) p pfile->hash_table->pfile == pfile $23 = false and it's instead pointing at the freed reader from consider_macro, leading to a use-after-free ICE. Fixed thusly. gcc/c/ChangeLog: PR analyzer/107711 * c-parser.cc (ana::c_translation_unit::consider_macro): Pass NULL to cpp_create_reader, rather than ident_hash, so that the new reader gets its own hash table. gcc/testsuite/ChangeLog: PR analyzer/107711 * gcc.dg/analyzer/named-constants-Wunused-macros.c: New test. Signed-off-by: David Malcolm <dmalcolm@redhat.com> Diff: --- gcc/c/c-parser.cc | 2 +- .../gcc.dg/analyzer/named-constants-Wunused-macros.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/gcc/c/c-parser.cc b/gcc/c/c-parser.cc index f3c79996fb0..1bbb39f9b08 100644 --- a/gcc/c/c-parser.cc +++ b/gcc/c/c-parser.cc @@ -1717,7 +1717,7 @@ private: return NULL_TREE; cpp_reader *old_parse_in = parse_in; - parse_in = cpp_create_reader (CLK_GNUC89, ident_hash, line_table); + parse_in = cpp_create_reader (CLK_GNUC89, NULL, line_table); pretty_printer pp; pp_string (&pp, (const char *) tok.val.str.text); diff --git a/gcc/testsuite/gcc.dg/analyzer/named-constants-Wunused-macros.c b/gcc/testsuite/gcc.dg/analyzer/named-constants-Wunused-macros.c new file mode 100644 index 00000000000..0b31cc42d78 --- /dev/null +++ b/gcc/testsuite/gcc.dg/analyzer/named-constants-Wunused-macros.c @@ -0,0 +1,19 @@ +/* Regression test for interaction of named constants in -fanalyzer with + -Wunused-macros (PR analyzer/107711). */ + +/* { dg-additional-options "-Wunused-macros" } */ + +#include "analyzer-decls.h" + +/* Various constants used by the fd state machine. */ + +#define O_ACCMODE 42 /* { dg-warning "-: macro \"O_ACCMODE\" is not used" } */ +#define O_RDONLY 0x1 /* { dg-warning "-: macro \"O_RDONLY\" is not used" } */ +#define O_WRONLY 010 /* { dg-warning "-: macro \"O_WRONLY\" is not used" } */ + +void test_sm_fd_constants (void) +{ + __analyzer_dump_named_constant ("O_ACCMODE"); /* { dg-warning "named constant 'O_ACCMODE' has value '42'" } */ + __analyzer_dump_named_constant ("O_RDONLY"); /* { dg-warning "named constant 'O_RDONLY' has value '1'" } */ + __analyzer_dump_named_constant ("O_WRONLY"); /* { dg-warning "named constant 'O_WRONLY' has value '8'" } */ +}
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