[{"id":3677846,"web_url":"http://patchwork.ozlabs.org/comment/3677846/","msgid":"","list_archive_url":null,"date":"2026-04-15T22:33:46","subject":"Re: [PATCH v2] analyzer: do not segfault when printing unknown impl\n location","submitter":{"id":24465,"url":"http://patchwork.ozlabs.org/api/people/24465/","name":"David Malcolm","email":"dmalcolm@redhat.com"},"content":"On Wed, 2026-04-15 at 19:31 +0200, Torbjörn SVENSSON wrote:\n> Changes since v1:\n> \n> - Removed changes to dumpfile.h\n> - If the char pointer is NULL, then print \"\" instead.\n> \n> With below patch, arm-none-eabi builds fine on macOS, Linux and\n> cross-building for Windows on Linux.\n> I've test the ice-pr124055-1.c and it no longer segfaults cc1 so I\n> think the change is fine.\n> Currently re-running the full testsuite. Is this ok for trunk if\n> there are no regressions?\n\nLGTM; thanks.\n\nDave\n\n> \n> Kind regards,\n> Torbjörn\n> \n> --\n> \n> When dump_impl_location_t::m_function or dump_impl_location_t::m_file\n> is NULL,\n> then GCC segfaults when attempting to print the location.\n> \n> $ ./bin/arm-none-eabi-gcc ../ice-pr124055-1.c -fanalyzer -Wanalyzer-\n> too-complex -Wanalyzer-symbol-too-complex -O -fdump-analyzer -\n> frounding-math -S -o /dev/null -wrapper lldb,--\n> (lldb) target create \"/build/r16-8473-\n> g5cc0ead3625fe6/bin/../lib/gcc/arm-none-eabi/16.0.1/cc1\"\n> ...\n> (lldb) r\n> Process 31748 launched: '/build/r16-8473-g5cc0ead3625fe6/lib/gcc/arm-\n> none-eabi/16.0.1/cc1' (arm64)\n> Process 31748 stopped\n> * thread #1, queue = 'com.apple.main-thread', stop reason =\n> EXC_BAD_ACCESS (code=1, address=0x0)\n>     frame #0: 0x000000018ae7ea44\n> libsystem_platform.dylib`_platform_strlen + 4\n> libsystem_platform.dylib`_platform_strlen:\n> ->  0x18ae7ea44 <+4>:  ldr    q0, [x1]\n>     0x18ae7ea48 <+8>:  adr    x3, 0x18ae7e980 ;\n> ___lldb_unnamed_symbol320\n>     0x18ae7ea4c <+12>: ldr    q2, [x3], #0x10\n>     0x18ae7ea50 <+16>: and    x2, x0, #0xf\n> Target 0: (cc1) stopped.\n> (lldb) bt\n> * thread #1, queue = 'com.apple.main-thread', stop reason =\n> EXC_BAD_ACCESS (code=1, address=0x0)\n>   * frame #0: 0x000000018ae7ea44\n> libsystem_platform.dylib`_platform_strlen + 4\n>     frame #1: 0x0000000101223d68\n> cc1`pp_quoted_string(pretty_printer*, char const*, unsigned long) +\n> 244\n>     frame #2: 0x0000000101220628\n> cc1`pretty_printer::format(text_info&) + 2772\n>     frame #3: 0x0000000101108b8c cc1`ana::logger::log_va(char const*,\n> char**) + 100\n>     frame #4: 0x0000000101108970 cc1`ana::logger::log(char const*,\n> ...) + 28\n>     frame #5: 0x0000000101129da4\n> cc1`ana::impl_region_model_context::on_unexpected_tree_code(tree_node\n> *, dump_location_t const&) + 80\n>     frame #6: 0x0000000101174d3c\n> cc1`ana::region_model_manager::get_region_for_unexpected_tree_code(an\n> a::region_model_context*, tree_node*, dump_location_t const&) + 184\n> ...\n> \n> This happens when GCC is built with GCC <4.8 or with another\n> toolchain,\n> like LLVM. Seen on macOS with clang-1600.0.26.6.\n> \n> gcc/analyzer/ChangeLog:\n> \n> \t* engine.cc\n> (impl_region_model_context::on_unexpected_tree_code): Print\n> \t\"\" when m_file or m_function is NULL.\n> \n> Signed-off-by: Torbjörn SVENSSON \n> ---\n>  gcc/analyzer/engine.cc | 14 +++++++++-----\n>  1 file changed, 9 insertions(+), 5 deletions(-)\n> \n> diff --git a/gcc/analyzer/engine.cc b/gcc/analyzer/engine.cc\n> index a4d870bd3d2..a5ab173ca16 100644\n> --- a/gcc/analyzer/engine.cc\n> +++ b/gcc/analyzer/engine.cc\n> @@ -904,11 +904,15 @@\n> impl_region_model_context::on_unexpected_tree_code (tree t,\n>  {\n>    logger * const logger = get_logger ();\n>    if (logger)\n> -    logger->log (\"unhandled tree code: %qs in %qs at %s:%i\",\n> -\t\t get_tree_code_name (TREE_CODE (t)),\n> -\t\t loc.get_impl_location ().m_function,\n> -\t\t loc.get_impl_location ().m_file,\n> -\t\t loc.get_impl_location ().m_line);\n> +    {\n> +      const dump_impl_location_t &impl_loc = loc.get_impl_location\n> ();\n> +      const char *unknown = \"\";\n> +      logger->log (\"unhandled tree code: %qs in %qs at %s:%i\",\n> +\t\t   get_tree_code_name (TREE_CODE (t)),\n> +\t\t   impl_loc.m_function ? impl_loc.m_function :\n> unknown,\n> +\t\t   impl_loc.m_file ? impl_loc.m_file : unknown,\n> +\t\t   impl_loc.m_line);\n> +    }\n>    if (m_new_state)\n>      m_new_state->m_valid = false;\n>  }","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=C/LSaePE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3678018,"web_url":"http://patchwork.ozlabs.org/comment/3678018/","msgid":"<473f3c2e-8c5f-41e7-a72b-96cb317d6e61@foss.st.com>","list_archive_url":null,"date":"2026-04-16T08:48:46","subject":"Re: [PATCH v2] analyzer: do not segfault when printing unknown impl\n location","submitter":{"id":84848,"url":"http://patchwork.ozlabs.org/api/people/84848/","name":"Torbjörn SVENSSON","email":"torbjorn.svensson@foss.st.com"},"content":"On 2026-04-16 00:33, David Malcolm wrote:\n> On Wed, 2026-04-15 at 19:31 +0200, Torbjörn SVENSSON wrote:\n>> Changes since v1:\n>>\n>> - Removed changes to dumpfile.h\n>> - If the char pointer is NULL, then print \"\" instead.\n>>\n>> With below patch, arm-none-eabi builds fine on macOS, Linux and\n>> cross-building for Windows on Linux.\n>> I've test the ice-pr124055-1.c and it no longer segfaults cc1 so I\n>> think the change is fine.\n>> Currently re-running the full testsuite. Is this ok for trunk if\n>> there are no regressions?\n> \n> LGTM; thanks.\n\nPushed as r16-8699-gc84443ab3c2dfa since there were no regressions in my test run.\n\nKind regards,\nTorbjörn\n\n> \n> Dave\n> \n>>\n>> Kind regards,\n>> Torbjörn\n>>\n>> --\n>>\n>> When dump_impl_location_t::m_function or dump_impl_location_t::m_file\n>> is NULL,\n>> then GCC segfaults when attempting to print the location.\n>>\n>> $ ./bin/arm-none-eabi-gcc ../ice-pr124055-1.c -fanalyzer -Wanalyzer-\n>> too-complex -Wanalyzer-symbol-too-complex -O -fdump-analyzer -\n>> frounding-math -S -o /dev/null -wrapper lldb,--\n>> (lldb) target create \"/build/r16-8473-\n>> g5cc0ead3625fe6/bin/../lib/gcc/arm-none-eabi/16.0.1/cc1\"\n>> ...\n>> (lldb) r\n>> Process 31748 launched: '/build/r16-8473-g5cc0ead3625fe6/lib/gcc/arm-\n>> none-eabi/16.0.1/cc1' (arm64)\n>> Process 31748 stopped\n>> * thread #1, queue = 'com.apple.main-thread', stop reason =\n>> EXC_BAD_ACCESS (code=1, address=0x0)\n>>     frame #0: 0x000000018ae7ea44\n>> libsystem_platform.dylib`_platform_strlen + 4\n>> libsystem_platform.dylib`_platform_strlen:\n>> ->  0x18ae7ea44 <+4>:  ldr    q0, [x1]\n>>     0x18ae7ea48 <+8>:  adr    x3, 0x18ae7e980 ;\n>> ___lldb_unnamed_symbol320\n>>     0x18ae7ea4c <+12>: ldr    q2, [x3], #0x10\n>>     0x18ae7ea50 <+16>: and    x2, x0, #0xf\n>> Target 0: (cc1) stopped.\n>> (lldb) bt\n>> * thread #1, queue = 'com.apple.main-thread', stop reason =\n>> EXC_BAD_ACCESS (code=1, address=0x0)\n>>   * frame #0: 0x000000018ae7ea44\n>> libsystem_platform.dylib`_platform_strlen + 4\n>>     frame #1: 0x0000000101223d68\n>> cc1`pp_quoted_string(pretty_printer*, char const*, unsigned long) +\n>> 244\n>>     frame #2: 0x0000000101220628\n>> cc1`pretty_printer::format(text_info&) + 2772\n>>     frame #3: 0x0000000101108b8c cc1`ana::logger::log_va(char const*,\n>> char**) + 100\n>>     frame #4: 0x0000000101108970 cc1`ana::logger::log(char const*,\n>> ...) + 28\n>>     frame #5: 0x0000000101129da4\n>> cc1`ana::impl_region_model_context::on_unexpected_tree_code(tree_node\n>> *, dump_location_t const&) + 80\n>>     frame #6: 0x0000000101174d3c\n>> cc1`ana::region_model_manager::get_region_for_unexpected_tree_code(an\n>> a::region_model_context*, tree_node*, dump_location_t const&) + 184\n>> ...\n>>\n>> This happens when GCC is built with GCC <4.8 or with another\n>> toolchain,\n>> like LLVM. Seen on macOS with clang-1600.0.26.6.\n>>\n>> gcc/analyzer/ChangeLog:\n>>\n>> \t* engine.cc\n>> (impl_region_model_context::on_unexpected_tree_code): Print\n>> \t\"\" when m_file or m_function is NULL.\n>>\n>> Signed-off-by: Torbjörn SVENSSON \n>> ---\n>>  gcc/analyzer/engine.cc | 14 +++++++++-----\n>>  1 file changed, 9 insertions(+), 5 deletions(-)\n>>\n>> diff --git a/gcc/analyzer/engine.cc b/gcc/analyzer/engine.cc\n>> index a4d870bd3d2..a5ab173ca16 100644\n>> --- a/gcc/analyzer/engine.cc\n>> +++ b/gcc/analyzer/engine.cc\n>> @@ -904,11 +904,15 @@\n>> impl_region_model_context::on_unexpected_tree_code (tree t,\n>>  {\n>>    logger * const logger = get_logger ();\n>>    if (logger)\n>> -    logger->log (\"unhandled tree code: %qs in %qs at %s:%i\",\n>> -\t\t get_tree_code_name (TREE_CODE (t)),\n>> -\t\t loc.get_impl_location ().m_function,\n>> -\t\t loc.get_impl_location ().m_file,\n>> -\t\t loc.get_impl_location ().m_line);\n>> +    {\n>> +      const dump_impl_location_t &impl_loc = loc.get_impl_location\n>> ();\n>> +      const char *unknown = \"\";\n>> +      logger->log (\"unhandled tree code: %qs in %qs at %s:%i\",\n>> +\t\t   get_tree_code_name (TREE_CODE (t)),\n>> +\t\t   impl_loc.m_function ? impl_loc.m_function :\n>> unknown,\n>> +\t\t   impl_loc.m_file ? impl_loc.m_file : unknown,\n>> +\t\t   impl_loc.m_line);\n>> +    }\n>>    if (m_new_state)\n>>      m_new_state->m_valid = false;\n>>  }\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=foss.st.com header.i=@foss.st.com header.a=rsa-sha256\n header.s=selector2 header.b=AekuDM65;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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