| |
| /*--------------------------------------------------------------------*/ |
| /*--- Management of error messages. m_errormgr.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2011 Julian Seward |
| jseward@acm.org |
| |
| This program 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 2 of the |
| License, or (at your option) any later version. |
| |
| This program 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 this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_core_basics.h" |
| #include "pub_core_vki.h" |
| #include "pub_core_libcsetjmp.h" |
| #include "pub_core_threadstate.h" // For VG_N_THREADS |
| #include "pub_core_debugger.h" |
| #include "pub_core_debuginfo.h" |
| #include "pub_core_errormgr.h" |
| #include "pub_core_execontext.h" |
| #include "pub_core_gdbserver.h" |
| #include "pub_core_libcbase.h" |
| #include "pub_core_libcassert.h" |
| #include "pub_core_libcfile.h" |
| #include "pub_core_libcprint.h" |
| #include "pub_core_libcproc.h" // For VG_(getpid)() |
| #include "pub_core_seqmatch.h" |
| #include "pub_core_mallocfree.h" |
| #include "pub_core_options.h" |
| #include "pub_core_stacktrace.h" |
| #include "pub_core_tooliface.h" |
| #include "pub_core_translate.h" // for VG_(translate)() |
| #include "pub_core_xarray.h" // VG_(xaprintf) et al |
| |
| /*------------------------------------------------------------*/ |
| /*--- Globals ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* After this many different unsuppressed errors have been observed, |
| be more conservative about collecting new ones. */ |
| #define M_COLLECT_ERRORS_SLOWLY_AFTER 100 |
| |
| /* After this many different unsuppressed errors have been observed, |
| stop collecting errors at all, and tell the user their program is |
| evidently a steaming pile of camel dung. */ |
| #define M_COLLECT_NO_ERRORS_AFTER_SHOWN 1000 |
| |
| /* After this many total errors have been observed, stop collecting |
| errors at all. Counterpart to M_COLLECT_NO_ERRORS_AFTER_SHOWN. */ |
| #define M_COLLECT_NO_ERRORS_AFTER_FOUND 10000000 |
| |
| /* The list of error contexts found, both suppressed and unsuppressed. |
| Initially empty, and grows as errors are detected. */ |
| static Error* errors = NULL; |
| |
| /* The list of suppression directives, as read from the specified |
| suppressions file. Note that the list gets rearranged as a result |
| of the searches done by is_suppressible_error(). */ |
| static Supp* suppressions = NULL; |
| |
| /* Running count of unsuppressed errors detected. */ |
| static UInt n_errs_found = 0; |
| |
| /* Running count of suppressed errors detected. */ |
| static UInt n_errs_suppressed = 0; |
| |
| /* Running count of unsuppressed error contexts. */ |
| static UInt n_err_contexts = 0; |
| |
| /* Running count of suppressed error contexts. */ |
| static UInt n_supp_contexts = 0; |
| |
| |
| /* forwards ... */ |
| static Supp* is_suppressible_error ( Error* err ); |
| |
| static ThreadId last_tid_printed = 1; |
| |
| /* Stats: number of searches of the error list initiated. */ |
| static UWord em_errlist_searches = 0; |
| |
| /* Stats: number of comparisons done during error list |
| searching. */ |
| static UWord em_errlist_cmps = 0; |
| |
| /* Stats: number of searches of the suppression list initiated. */ |
| static UWord em_supplist_searches = 0; |
| |
| /* Stats: number of comparisons done during suppression list |
| searching. */ |
| static UWord em_supplist_cmps = 0; |
| |
| /*------------------------------------------------------------*/ |
| /*--- Error type ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Errors. Extensible (via the 'extra' field). Tools can use a normal |
| enum (with element values in the normal range (0..)) for 'ekind'. |
| Functions for getting/setting the tool-relevant fields are in |
| include/pub_tool_errormgr.h. |
| |
| When errors are found and recorded with VG_(maybe_record_error)(), all |
| the tool must do is pass in the four parameters; core will |
| allocate/initialise the error record. |
| */ |
| struct _Error { |
| struct _Error* next; |
| // Unique tag. This gives the error a unique identity (handle) by |
| // which it can be referred to afterwords. Currently only used for |
| // XML printing. |
| UInt unique; |
| // NULL if unsuppressed; or ptr to suppression record. |
| Supp* supp; |
| Int count; |
| |
| // The tool-specific part |
| ThreadId tid; // Initialised by core |
| ExeContext* where; // Initialised by core |
| ErrorKind ekind; // Used by ALL. Must be in the range (0..) |
| Addr addr; // Used frequently |
| Char* string; // Used frequently |
| void* extra; // For any tool-specific extras |
| }; |
| |
| |
| ExeContext* VG_(get_error_where) ( Error* err ) |
| { |
| return err->where; |
| } |
| |
| ErrorKind VG_(get_error_kind) ( Error* err ) |
| { |
| return err->ekind; |
| } |
| |
| Addr VG_(get_error_address) ( Error* err ) |
| { |
| return err->addr; |
| } |
| |
| Char* VG_(get_error_string) ( Error* err ) |
| { |
| return err->string; |
| } |
| |
| void* VG_(get_error_extra) ( Error* err ) |
| { |
| return err->extra; |
| } |
| |
| UInt VG_(get_n_errs_found)( void ) |
| { |
| return n_errs_found; |
| } |
| |
| /*------------------------------------------------------------*/ |
| /*--- Suppression type ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Note: it is imperative this doesn't overlap with (0..) at all, as tools |
| * effectively extend it by defining their own enums in the (0..) range. */ |
| typedef |
| enum { |
| // Nb: thread errors are a relic of the time when Valgrind's core |
| // could detect them. This example is left commented-out as an |
| // example should new core errors ever be added. |
| ThreadSupp = -1, /* Matches ThreadErr */ |
| } |
| CoreSuppKind; |
| |
| /* Max number of callers for context in a suppression. */ |
| #define VG_MAX_SUPP_CALLERS 24 |
| |
| /* For each caller specified for a suppression, record the nature of |
| the caller name. Not of interest to tools. */ |
| typedef |
| enum { |
| NoName, /* Error case */ |
| ObjName, /* Name is of an shared object file. */ |
| FunName, /* Name is of a function. */ |
| DotDotDot /* Frame-level wildcard */ |
| } |
| SuppLocTy; |
| |
| typedef |
| struct { |
| SuppLocTy ty; |
| Char* name; /* NULL for NoName and DotDotDot */ |
| } |
| SuppLoc; |
| |
| /* Suppressions. Tools can get/set tool-relevant parts with functions |
| declared in include/pub_tool_errormgr.h. Extensible via the 'extra' field. |
| Tools can use a normal enum (with element values in the normal range |
| (0..)) for 'skind'. */ |
| struct _Supp { |
| struct _Supp* next; |
| Int count; // The number of times this error has been suppressed. |
| Char* sname; // The name by which the suppression is referred to. |
| |
| // Length of 'callers' |
| Int n_callers; |
| // Array of callers, for matching stack traces. First one (name of fn |
| // where err occurs) is mandatory; rest are optional. |
| SuppLoc* callers; |
| |
| /* The tool-specific part */ |
| SuppKind skind; // What kind of suppression. Must use the range (0..). |
| Char* string; // String -- use is optional. NULL by default. |
| void* extra; // Anything else -- use is optional. NULL by default. |
| }; |
| |
| SuppKind VG_(get_supp_kind) ( Supp* su ) |
| { |
| return su->skind; |
| } |
| |
| Char* VG_(get_supp_string) ( Supp* su ) |
| { |
| return su->string; |
| } |
| |
| void* VG_(get_supp_extra) ( Supp* su ) |
| { |
| return su->extra; |
| } |
| |
| |
| void VG_(set_supp_kind) ( Supp* su, SuppKind skind ) |
| { |
| su->skind = skind; |
| } |
| |
| void VG_(set_supp_string) ( Supp* su, Char* string ) |
| { |
| su->string = string; |
| } |
| |
| void VG_(set_supp_extra) ( Supp* su, void* extra ) |
| { |
| su->extra = extra; |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Helper fns ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // Only show core errors if the tool wants to, we're not running with -q, |
| // and were not outputting XML. |
| Bool VG_(showing_core_errors)(void) |
| { |
| return VG_(needs).core_errors && VG_(clo_verbosity) >= 1 && !VG_(clo_xml); |
| } |
| |
| /* Compare errors, to detect duplicates. |
| */ |
| static Bool eq_Error ( VgRes res, Error* e1, Error* e2 ) |
| { |
| if (e1->ekind != e2->ekind) |
| return False; |
| if (!VG_(eq_ExeContext)(res, e1->where, e2->where)) |
| return False; |
| |
| switch (e1->ekind) { |
| //(example code, see comment on CoreSuppKind above) |
| //case ThreadErr: |
| // vg_assert(VG_(needs).core_errors); |
| // return <something> |
| default: |
| if (VG_(needs).tool_errors) { |
| return VG_TDICT_CALL(tool_eq_Error, res, e1, e2); |
| } else { |
| VG_(printf)("\nUnhandled error type: %u. VG_(needs).tool_errors\n" |
| "probably needs to be set.\n", |
| e1->ekind); |
| VG_(tool_panic)("unhandled error type"); |
| } |
| } |
| } |
| |
| |
| /* Helper functions for suppression generation: print a single line of |
| a suppression pseudo-stack-trace, either in XML or text mode. It's |
| important that the behaviour of these two functions exactly |
| corresponds. |
| */ |
| #define ERRTXT_LEN 4096 |
| |
| static void printSuppForIp_XML(UInt n, Addr ip, void* uu_opaque) |
| { |
| static UChar buf[ERRTXT_LEN]; |
| if ( VG_(get_fnname_no_cxx_demangle) (ip, buf, ERRTXT_LEN) ) { |
| VG_(printf_xml)(" <sframe> <fun>%pS</fun> </sframe>\n", buf); |
| } else |
| if ( VG_(get_objname)(ip, buf, ERRTXT_LEN) ) { |
| VG_(printf_xml)(" <sframe> <obj>%pS</obj> </sframe>\n", buf); |
| } else { |
| VG_(printf_xml)(" <sframe> <obj>*</obj> </sframe>\n"); |
| } |
| } |
| |
| static void printSuppForIp_nonXML(UInt n, Addr ip, void* textV) |
| { |
| static UChar buf[ERRTXT_LEN]; |
| XArray* /* of HChar */ text = (XArray*)textV; |
| if ( VG_(get_fnname_no_cxx_demangle) (ip, buf, ERRTXT_LEN) ) { |
| VG_(xaprintf)(text, " fun:%s\n", buf); |
| } else |
| if ( VG_(get_objname)(ip, buf, ERRTXT_LEN) ) { |
| VG_(xaprintf)(text, " obj:%s\n", buf); |
| } else { |
| VG_(xaprintf)(text, " obj:*\n"); |
| } |
| } |
| |
| /* Generate a suppression for an error, either in text or XML mode. |
| */ |
| static void gen_suppression(Error* err) |
| { |
| Char xtra[256]; /* assumed big enough (is overrun-safe) */ |
| Bool anyXtra; |
| Char* name; |
| ExeContext* ec; |
| XArray* /* HChar */ text; |
| |
| const HChar* dummy_name = "insert_a_suppression_name_here"; |
| |
| vg_assert(err); |
| |
| ec = VG_(get_error_where)(err); |
| vg_assert(ec); |
| |
| name = VG_TDICT_CALL(tool_get_error_name, err); |
| if (NULL == name) { |
| VG_(umsg)("(%s does not allow error to be suppressed)\n", |
| VG_(details).name); |
| return; |
| } |
| |
| /* In XML mode, we also need to print the plain text version of the |
| suppresion in a CDATA section. What that really means is, we |
| need to generate the plaintext version both in XML and text |
| mode. So generate it into TEXT. */ |
| text = VG_(newXA)( VG_(malloc), "errormgr.gen_suppression.1", |
| VG_(free), sizeof(HChar) ); |
| vg_assert(text); |
| |
| /* Ok. Generate the plain text version into TEXT. */ |
| VG_(xaprintf)(text, "{\n"); |
| VG_(xaprintf)(text, " <%s>\n", dummy_name); |
| VG_(xaprintf)(text, " %s:%s\n", VG_(details).name, name); |
| |
| VG_(memset)(xtra, 0, sizeof(xtra)); |
| anyXtra = VG_TDICT_CALL(tool_get_extra_suppression_info, |
| err, xtra, sizeof(xtra)); |
| vg_assert(xtra[sizeof(xtra)-1] == 0); |
| |
| if (anyXtra) |
| VG_(xaprintf)(text, " %s\n", xtra); |
| |
| // Print stack trace elements |
| UInt n_ips = VG_(get_ExeContext_n_ips)(ec); |
| tl_assert(n_ips > 0); |
| if (n_ips > VG_MAX_SUPP_CALLERS) |
| n_ips = VG_MAX_SUPP_CALLERS; |
| VG_(apply_StackTrace)(printSuppForIp_nonXML, |
| text, |
| VG_(get_ExeContext_StackTrace)(ec), |
| n_ips); |
| |
| VG_(xaprintf)(text, "}\n"); |
| // zero terminate |
| VG_(xaprintf)(text, "%c", (HChar)0 ); |
| // VG_(printf) of text |
| |
| /* And now display it. */ |
| if (! VG_(clo_xml) ) { |
| |
| // the simple case |
| VG_(printf)("%s", (HChar*) VG_(indexXA)(text, 0) ); |
| |
| } else { |
| |
| /* Now we have to print the XML directly. No need to go to the |
| effort of stuffing it in an XArray, since we won't need it |
| again. */ |
| VG_(printf_xml)(" <suppression>\n"); |
| VG_(printf_xml)(" <sname>%s</sname>\n", dummy_name); |
| VG_(printf_xml)( |
| " <skind>%pS:%pS</skind>\n", VG_(details).name, name); |
| if (anyXtra) |
| VG_(printf_xml)(" <skaux>%pS</skaux>\n", xtra); |
| |
| // Print stack trace elements |
| VG_(apply_StackTrace)(printSuppForIp_XML, |
| NULL, |
| VG_(get_ExeContext_StackTrace)(ec), |
| VG_(get_ExeContext_n_ips)(ec)); |
| |
| // And now the cdata bit |
| // XXX FIXME! properly handle the case where the raw text |
| // itself contains "]]>", as specified in Protocol 4. |
| VG_(printf_xml)(" <rawtext>\n"); |
| VG_(printf_xml)("<![CDATA[\n"); |
| VG_(printf_xml)("%s", (HChar*) VG_(indexXA)(text, 0) ); |
| VG_(printf_xml)("]]>\n"); |
| VG_(printf_xml)(" </rawtext>\n"); |
| VG_(printf_xml)(" </suppression>\n"); |
| |
| } |
| |
| VG_(deleteXA)(text); |
| } |
| |
| |
| /* Figure out if we want to perform a given action for this error, |
| possibly by asking the user. |
| */ |
| Bool VG_(is_action_requested) ( Char* action, Bool* clo ) |
| { |
| Char ch, ch2; |
| Int res; |
| |
| /* First off, we shouldn't be asking the user anything if |
| we're in XML mode. */ |
| if (VG_(clo_xml)) |
| return False; /* That's a Nein, oder Nay as they say down here in B-W */ |
| |
| if (*clo == False) |
| return False; |
| |
| VG_(umsg)("\n"); |
| |
| again: |
| VG_(printf)( |
| "==%d== " |
| "---- %s ? --- [Return/N/n/Y/y/C/c] ---- ", |
| VG_(getpid)(), action |
| ); |
| |
| res = VG_(read)(VG_(clo_input_fd), &ch, 1); |
| if (res != 1) goto ioerror; |
| /* res == 1 */ |
| if (ch == '\n') return False; |
| if (ch != 'N' && ch != 'n' && ch != 'Y' && ch != 'y' |
| && ch != 'C' && ch != 'c') goto again; |
| |
| res = VG_(read)(VG_(clo_input_fd), &ch2, 1); |
| if (res != 1) goto ioerror; |
| if (ch2 != '\n') goto again; |
| |
| /* No, don't want to do action. */ |
| if (ch == 'n' || ch == 'N') return False; |
| /* Yes, want to do action. */ |
| if (ch == 'y' || ch == 'Y') return True; |
| /* No, don't want to do action, and don't ask again either. */ |
| vg_assert(ch == 'c' || ch == 'C'); |
| |
| ioerror: |
| *clo = False; |
| return False; |
| } |
| |
| |
| /* Do text-mode actions on error, that is, immediately after an error |
| is printed. These are: |
| * possibly, attach to a debugger |
| * possibly, generate a suppression. |
| Note this should not be called in XML mode! |
| */ |
| static |
| void do_actions_on_error(Error* err, Bool allow_db_attach) |
| { |
| Bool still_noisy = True; |
| |
| /* Should be assured by caller */ |
| vg_assert( ! VG_(clo_xml) ); |
| |
| /* if user wants to debug from a certain error nr, then wait for gdb/vgdb */ |
| if (VG_(clo_vgdb) != Vg_VgdbNo |
| && allow_db_attach |
| && VG_(dyn_vgdb_error) <= n_errs_found) { |
| VG_(umsg)("(action on error) vgdb me ... \n"); |
| VG_(gdbserver)( err->tid ); |
| VG_(umsg)("Continuing ...\n"); |
| } |
| |
| /* Perhaps we want a debugger attach at this point? */ |
| /* GDBTD ??? maybe we should/could remove the below assuming the |
| gdbserver interface is better ??? */ |
| if (allow_db_attach && |
| VG_(is_action_requested)( "Attach to debugger", & VG_(clo_db_attach) )) |
| { |
| if (0) VG_(printf)("starting debugger\n"); |
| VG_(start_debugger)( err->tid ); |
| } |
| /* Or maybe we want to generate the error's suppression? */ |
| if (VG_(clo_gen_suppressions) == 2 |
| || (VG_(clo_gen_suppressions) == 1 |
| && VG_(is_action_requested)( "Print suppression", &still_noisy )) |
| ) { |
| gen_suppression(err); |
| } |
| if (VG_(clo_gen_suppressions) == 1 && !still_noisy) |
| VG_(clo_gen_suppressions) = 0; |
| } |
| |
| |
| /* Prints an error. Not entirely simple because of the differences |
| between XML and text mode output. |
| |
| In XML mode: |
| |
| * calls the tool's pre-show method, so the tool can create any |
| preamble ahead of the message, if it wants. |
| |
| * prints the opening tag, and the <unique> and <tid> fields |
| |
| * prints the tool-specific parts of the message |
| |
| * if suppression generation is required, a suppression |
| |
| * the closing tag |
| |
| In text mode: |
| |
| * calls the tool's pre-show method, so the tool can create any |
| preamble ahead of the message, if it wants. |
| |
| * prints the tool-specific parts of the message |
| |
| * calls do_actions_on_error. This optionally does a debugger |
| attach (and detach), and optionally prints a suppression; both |
| of these may require user input. |
| */ |
| static void pp_Error ( Error* err, Bool allow_db_attach, Bool xml ) |
| { |
| /* If this fails, you probably specified your tool's method |
| dictionary incorrectly. */ |
| vg_assert(VG_(needs).tool_errors); |
| |
| if (xml) { |
| |
| /* Note, allow_db_attach is ignored in here. */ |
| |
| /* Ensure that suppression generation is either completely |
| enabled or completely disabled; either way, we won't require |
| any user input. m_main.process_cmd_line_options should |
| ensure the asserted condition holds. */ |
| vg_assert( VG_(clo_gen_suppressions) == 0 /* disabled */ |
| || VG_(clo_gen_suppressions) == 2 /* for all errors */ ); |
| |
| /* Pre-show it to the tool */ |
| VG_TDICT_CALL( tool_before_pp_Error, err ); |
| |
| /* standard preamble */ |
| VG_(printf_xml)("<error>\n"); |
| VG_(printf_xml)(" <unique>0x%x</unique>\n", err->unique); |
| VG_(printf_xml)(" <tid>%d</tid>\n", err->tid); |
| |
| /* actually print it */ |
| VG_TDICT_CALL( tool_pp_Error, err ); |
| |
| if (VG_(clo_gen_suppressions) > 0) |
| gen_suppression(err); |
| |
| /* postamble */ |
| VG_(printf_xml)("</error>\n"); |
| VG_(printf_xml)("\n"); |
| |
| } else { |
| |
| VG_TDICT_CALL( tool_before_pp_Error, err ); |
| |
| if (VG_(tdict).tool_show_ThreadIDs_for_errors |
| && err->tid > 0 && err->tid != last_tid_printed) { |
| VG_(umsg)("Thread %d:\n", err->tid ); |
| last_tid_printed = err->tid; |
| } |
| |
| VG_TDICT_CALL( tool_pp_Error, err ); |
| VG_(umsg)("\n"); |
| |
| do_actions_on_error(err, allow_db_attach); |
| } |
| } |
| |
| |
| /* Construct an error */ |
| static |
| void construct_error ( Error* err, ThreadId tid, ErrorKind ekind, Addr a, |
| Char* s, void* extra, ExeContext* where ) |
| { |
| /* DO NOT MAKE unique_counter NON-STATIC */ |
| static UInt unique_counter = 0; |
| |
| tl_assert(tid < VG_N_THREADS); |
| |
| /* Core-only parts */ |
| err->unique = unique_counter++; |
| err->next = NULL; |
| err->supp = NULL; |
| err->count = 1; |
| err->tid = tid; |
| if (NULL == where) |
| err->where = VG_(record_ExeContext)( tid, 0 ); |
| else |
| err->where = where; |
| |
| /* Tool-relevant parts */ |
| err->ekind = ekind; |
| err->addr = a; |
| err->extra = extra; |
| err->string = s; |
| |
| /* sanity... */ |
| vg_assert( tid < VG_N_THREADS ); |
| } |
| |
| |
| |
| static Int n_errs_shown = 0; |
| |
| /* Top-level entry point to the error management subsystem. |
| All detected errors are notified here; this routine decides if/when the |
| user should see the error. */ |
| void VG_(maybe_record_error) ( ThreadId tid, |
| ErrorKind ekind, Addr a, Char* s, void* extra ) |
| { |
| Error err; |
| Error* p; |
| Error* p_prev; |
| UInt extra_size; |
| VgRes exe_res = Vg_MedRes; |
| static Bool stopping_message = False; |
| static Bool slowdown_message = False; |
| |
| /* After M_COLLECT_NO_ERRORS_AFTER_SHOWN different errors have |
| been found, or M_COLLECT_NO_ERRORS_AFTER_FOUND total errors |
| have been found, just refuse to collect any more. This stops |
| the burden of the error-management system becoming excessive in |
| extremely buggy programs, although it does make it pretty |
| pointless to continue the Valgrind run after this point. */ |
| if (VG_(clo_error_limit) |
| && (n_errs_shown >= M_COLLECT_NO_ERRORS_AFTER_SHOWN |
| || n_errs_found >= M_COLLECT_NO_ERRORS_AFTER_FOUND) |
| && !VG_(clo_xml)) { |
| if (!stopping_message) { |
| VG_(umsg)("\n"); |
| |
| if (n_errs_shown >= M_COLLECT_NO_ERRORS_AFTER_SHOWN) { |
| VG_(umsg)( |
| "More than %d different errors detected. " |
| "I'm not reporting any more.\n", |
| M_COLLECT_NO_ERRORS_AFTER_SHOWN ); |
| } else { |
| VG_(umsg)( |
| "More than %d total errors detected. " |
| "I'm not reporting any more.\n", |
| M_COLLECT_NO_ERRORS_AFTER_FOUND ); |
| } |
| |
| VG_(umsg)("Final error counts will be inaccurate. " |
| "Go fix your program!\n"); |
| VG_(umsg)("Rerun with --error-limit=no to disable " |
| "this cutoff. Note\n"); |
| VG_(umsg)("that errors may occur in your program without " |
| "prior warning from\n"); |
| VG_(umsg)("Valgrind, because errors are no longer " |
| "being displayed.\n"); |
| VG_(umsg)("\n"); |
| stopping_message = True; |
| } |
| return; |
| } |
| |
| /* Ignore it if error acquisition is disabled for this thread. */ |
| { ThreadState* tst = VG_(get_ThreadState)(tid); |
| if (tst->err_disablement_level > 0) |
| return; |
| } |
| |
| /* After M_COLLECT_ERRORS_SLOWLY_AFTER different errors have |
| been found, be much more conservative about collecting new |
| ones. */ |
| if (n_errs_shown >= M_COLLECT_ERRORS_SLOWLY_AFTER |
| && !VG_(clo_xml)) { |
| exe_res = Vg_LowRes; |
| if (!slowdown_message) { |
| VG_(umsg)("\n"); |
| VG_(umsg)("More than %d errors detected. Subsequent errors\n", |
| M_COLLECT_ERRORS_SLOWLY_AFTER); |
| VG_(umsg)("will still be recorded, but in less " |
| "detail than before.\n"); |
| slowdown_message = True; |
| } |
| } |
| |
| /* Build ourselves the error */ |
| construct_error ( &err, tid, ekind, a, s, extra, NULL ); |
| |
| /* First, see if we've got an error record matching this one. */ |
| em_errlist_searches++; |
| p = errors; |
| p_prev = NULL; |
| while (p != NULL) { |
| em_errlist_cmps++; |
| if (eq_Error(exe_res, p, &err)) { |
| /* Found it. */ |
| p->count++; |
| if (p->supp != NULL) { |
| /* Deal correctly with suppressed errors. */ |
| p->supp->count++; |
| n_errs_suppressed++; |
| } else { |
| n_errs_found++; |
| } |
| |
| /* Move p to the front of the list so that future searches |
| for it are faster. It also allows to print the last |
| error (see VG_(show_last_error). */ |
| if (p_prev != NULL) { |
| vg_assert(p_prev->next == p); |
| p_prev->next = p->next; |
| p->next = errors; |
| errors = p; |
| } |
| |
| return; |
| } |
| p_prev = p; |
| p = p->next; |
| } |
| |
| /* Didn't see it. Copy and add. */ |
| |
| /* OK, we're really going to collect it. The context is on the stack and |
| will disappear shortly, so we must copy it. First do the main |
| (non-'extra') part. |
| |
| Then VG_(tdict).tool_update_extra can update the 'extra' part. This |
| is for when there are more details to fill in which take time to work |
| out but don't affect our earlier decision to include the error -- by |
| postponing those details until now, we avoid the extra work in the |
| case where we ignore the error. Ugly. |
| |
| Then, if there is an 'extra' part, copy it too, using the size that |
| VG_(tdict).tool_update_extra returned. Also allow for people using |
| the void* extra field for a scalar value like an integer. |
| */ |
| |
| /* copy main part */ |
| p = VG_(arena_malloc)(VG_AR_ERRORS, "errormgr.mre.1", sizeof(Error)); |
| *p = err; |
| |
| /* update 'extra' */ |
| switch (ekind) { |
| //(example code, see comment on CoreSuppKind above) |
| //case ThreadErr: |
| // vg_assert(VG_(needs).core_errors); |
| // extra_size = <something> |
| // break; |
| default: |
| vg_assert(VG_(needs).tool_errors); |
| extra_size = VG_TDICT_CALL(tool_update_extra, p); |
| break; |
| } |
| |
| /* copy block pointed to by 'extra', if there is one */ |
| if (NULL != p->extra && 0 != extra_size) { |
| void* new_extra = VG_(malloc)("errormgr.mre.2", extra_size); |
| VG_(memcpy)(new_extra, p->extra, extra_size); |
| p->extra = new_extra; |
| } |
| |
| p->next = errors; |
| p->supp = is_suppressible_error(&err); |
| errors = p; |
| if (p->supp == NULL) { |
| n_err_contexts++; |
| n_errs_found++; |
| /* Actually show the error; more complex than you might think. */ |
| pp_Error( p, /*allow_db_attach*/True, VG_(clo_xml) ); |
| /* update stats */ |
| n_errs_shown++; |
| } else { |
| n_supp_contexts++; |
| n_errs_suppressed++; |
| p->supp->count++; |
| } |
| } |
| |
| /* Second top-level entry point to the error management subsystem, for |
| errors that the tool wants to report immediately, eg. because they're |
| guaranteed to only happen once. This avoids all the recording and |
| comparing stuff. But they can be suppressed; returns True if it is |
| suppressed. Bool 'print_error' dictates whether to print the error. |
| Bool 'count_error' dictates whether to count the error in n_errs_found. |
| */ |
| Bool VG_(unique_error) ( ThreadId tid, ErrorKind ekind, Addr a, Char* s, |
| void* extra, ExeContext* where, Bool print_error, |
| Bool allow_db_attach, Bool count_error ) |
| { |
| Error err; |
| Supp *su; |
| |
| /* Ignore it if error acquisition is disabled for this thread. */ |
| ThreadState* tst = VG_(get_ThreadState)(tid); |
| if (tst->err_disablement_level > 0) |
| return False; /* ignored, not suppressed */ |
| |
| /* Build ourselves the error */ |
| construct_error ( &err, tid, ekind, a, s, extra, where ); |
| |
| /* Unless it's suppressed, we're going to show it. Don't need to make |
| a copy, because it's only temporary anyway. |
| |
| Then update the 'extra' part with VG_(tdict).tool_update_extra), |
| because that can have an affect on whether it's suppressed. Ignore |
| the size return value of VG_(tdict).tool_update_extra, because we're |
| not copying 'extra'. */ |
| (void)VG_TDICT_CALL(tool_update_extra, &err); |
| |
| su = is_suppressible_error(&err); |
| if (NULL == su) { |
| if (count_error) { |
| n_errs_found++; |
| n_err_contexts++; |
| } |
| |
| if (print_error) { |
| /* Actually show the error; more complex than you might think. */ |
| pp_Error(&err, allow_db_attach, VG_(clo_xml)); |
| /* update stats */ |
| n_errs_shown++; |
| } |
| return False; |
| |
| } else { |
| if (count_error) { |
| n_errs_suppressed++; |
| n_supp_contexts++; |
| } |
| su->count++; |
| return True; |
| } |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Exported fns ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Show the used suppressions. Returns False if no suppression |
| got used. */ |
| static Bool show_used_suppressions ( void ) |
| { |
| Supp *su; |
| Bool any_supp; |
| |
| if (VG_(clo_xml)) |
| VG_(printf_xml)("<suppcounts>\n"); |
| |
| any_supp = False; |
| for (su = suppressions; su != NULL; su = su->next) { |
| if (su->count <= 0) |
| continue; |
| if (VG_(clo_xml)) { |
| VG_(printf_xml)( " <pair>\n" |
| " <count>%d</count>\n" |
| " <name>%pS</name>\n" |
| " </pair>\n", |
| su->count, su->sname ); |
| } else { |
| // blank line before the first shown suppression, if any |
| if (!any_supp) |
| VG_(dmsg)("\n"); |
| VG_(dmsg)("used_suppression: %6d %s\n", su->count, su->sname); |
| } |
| any_supp = True; |
| } |
| |
| if (VG_(clo_xml)) |
| VG_(printf_xml)("</suppcounts>\n"); |
| |
| return any_supp; |
| } |
| |
| /* Show all the errors that occurred, and possibly also the |
| suppressions used. */ |
| void VG_(show_all_errors) ( Int verbosity, Bool xml ) |
| { |
| Int i, n_min; |
| Error *p, *p_min; |
| Bool any_supp; |
| |
| if (verbosity == 0) |
| return; |
| |
| /* If we're printing XML, just show the suppressions and stop. */ |
| if (xml) { |
| (void)show_used_suppressions(); |
| return; |
| } |
| |
| /* We only get here if not printing XML. */ |
| VG_(umsg)("ERROR SUMMARY: " |
| "%d errors from %d contexts (suppressed: %d from %d)\n", |
| n_errs_found, n_err_contexts, |
| n_errs_suppressed, n_supp_contexts ); |
| |
| if (verbosity <= 1) |
| return; |
| |
| // We do the following only at -v or above, and only in non-XML |
| // mode |
| |
| /* Print the contexts in order of increasing error count. |
| Once an error is shown, we add a huge value to its count to filter it |
| out. After having shown all errors, we reset count to the original value. */ |
| for (i = 0; i < n_err_contexts; i++) { |
| n_min = (1 << 30) - 1; |
| p_min = NULL; |
| for (p = errors; p != NULL; p = p->next) { |
| if (p->supp != NULL) continue; |
| if (p->count < n_min) { |
| n_min = p->count; |
| p_min = p; |
| } |
| } |
| // XXX: this isn't right. See bug 203651. |
| if (p_min == NULL) continue; //VG_(tool_panic)("show_all_errors()"); |
| |
| VG_(umsg)("\n"); |
| VG_(umsg)("%d errors in context %d of %d:\n", |
| p_min->count, i+1, n_err_contexts); |
| pp_Error( p_min, False/*allow_db_attach*/, False /* xml */ ); |
| |
| // We're not printing XML -- we'd have exited above if so. |
| vg_assert(! xml); |
| |
| if ((i+1 == VG_(clo_dump_error))) { |
| StackTrace ips = VG_(get_ExeContext_StackTrace)(p_min->where); |
| VG_(translate) ( 0 /* dummy ThreadId; irrelevant due to debugging*/, |
| ips[0], /*debugging*/True, 0xFE/*verbosity*/, |
| /*bbs_done*/0, |
| /*allow redir?*/True); |
| } |
| |
| p_min->count = p_min->count + (1 << 30); |
| } |
| |
| /* reset the counts, otherwise a 2nd call does not show anything anymore */ |
| for (p = errors; p != NULL; p = p->next) { |
| if (p->count >= (1 << 30)) |
| p->count = p->count - (1 << 30); |
| } |
| |
| |
| any_supp = show_used_suppressions(); |
| |
| if (any_supp) |
| VG_(umsg)("\n"); |
| // reprint this, so users don't have to scroll way up to find |
| // the first printing |
| VG_(umsg)("ERROR SUMMARY: " |
| "%d errors from %d contexts (suppressed: %d from %d)\n", |
| n_errs_found, n_err_contexts, n_errs_suppressed, |
| n_supp_contexts ); |
| } |
| |
| void VG_(show_last_error) ( void ) |
| { |
| if (n_err_contexts == 0) { |
| VG_(umsg)("No errors yet\n"); |
| return; |
| } |
| |
| pp_Error( errors, False/*allow_db_attach*/, False/*xml*/ ); |
| } |
| |
| |
| /* Show occurrence counts of all errors, in XML form. */ |
| void VG_(show_error_counts_as_XML) ( void ) |
| { |
| Error* err; |
| VG_(printf_xml)("<errorcounts>\n"); |
| for (err = errors; err != NULL; err = err->next) { |
| if (err->supp != NULL) |
| continue; |
| if (err->count <= 0) |
| continue; |
| VG_(printf_xml)(" <pair>\n"); |
| VG_(printf_xml)(" <count>%d</count>\n", err->count); |
| VG_(printf_xml)(" <unique>0x%x</unique>\n", err->unique); |
| VG_(printf_xml)(" </pair>\n"); |
| } |
| VG_(printf_xml)("</errorcounts>\n"); |
| VG_(printf_xml)("\n"); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Suppression parsing ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Get the next char from fd into *out_buf. Returns 1 if success, |
| 0 if eof or < 0 if error. */ |
| |
| static Int get_char ( Int fd, Char* out_buf ) |
| { |
| Int r; |
| static Char buf[256]; |
| static Int buf_size = 0; |
| static Int buf_used = 0; |
| vg_assert(buf_size >= 0 && buf_size <= 256); |
| vg_assert(buf_used >= 0 && buf_used <= buf_size); |
| if (buf_used == buf_size) { |
| r = VG_(read)(fd, buf, 256); |
| if (r < 0) return r; /* read failed */ |
| vg_assert(r >= 0 && r <= 256); |
| buf_size = r; |
| buf_used = 0; |
| } |
| if (buf_size == 0) |
| return 0; /* eof */ |
| vg_assert(buf_size >= 0 && buf_size <= 256); |
| vg_assert(buf_used >= 0 && buf_used < buf_size); |
| *out_buf = buf[buf_used]; |
| buf_used++; |
| return 1; |
| } |
| |
| Bool VG_(get_line) ( Int fd, Char** bufpp, SizeT* nBufp, Int* lineno ) |
| { |
| Char* buf = *bufpp; |
| SizeT nBuf = *nBufp; |
| Char ch; |
| Int n, i; |
| while (True) { |
| /* First, read until a non-blank char appears. */ |
| while (True) { |
| n = get_char(fd, &ch); |
| if (n == 1 && !VG_(isspace)(ch)) break; |
| if (n == 1 && ch == '\n' && lineno) |
| (*lineno)++; |
| if (n <= 0) return True; |
| } |
| |
| /* Now, read the line into buf. */ |
| i = 0; |
| buf[i++] = ch; buf[i] = 0; |
| while (True) { |
| n = get_char(fd, &ch); |
| if (n <= 0) return False; /* the next call will return True */ |
| if (ch == '\n' && lineno) |
| (*lineno)++; |
| if (ch == '\n') break; |
| if (i > 0 && i == nBuf-1) { |
| *nBufp = nBuf = nBuf * 2; |
| #define RIDICULOUS 100000 |
| vg_assert2(nBuf < RIDICULOUS, // Just a sanity check, really. |
| "VG_(get_line): line longer than %d chars, aborting\n", |
| RIDICULOUS); |
| *bufpp = buf = VG_(realloc)("errormgr.get_line.1", buf, nBuf); |
| } |
| buf[i++] = ch; buf[i] = 0; |
| } |
| while (i > 1 && VG_(isspace)(buf[i-1])) { |
| i--; buf[i] = 0; |
| }; |
| |
| /* VG_(printf)("The line is '%s'\n", buf); */ |
| /* Ok, we have a line. If a non-comment line, return. |
| If a comment line, start all over again. */ |
| if (buf[0] != '#') return False; |
| } |
| } |
| |
| |
| /* *p_caller contains the raw name of a caller, supposedly either |
| fun:some_function_name or |
| obj:some_object_name. |
| Set *p_ty accordingly and advance *p_caller over the descriptor |
| (fun: or obj:) part. |
| Returns False if failed. |
| */ |
| static Bool setLocationTy ( SuppLoc* p ) |
| { |
| if (VG_(strncmp)(p->name, "fun:", 4) == 0) { |
| p->name += 4; |
| p->ty = FunName; |
| return True; |
| } |
| if (VG_(strncmp)(p->name, "obj:", 4) == 0) { |
| p->name += 4; |
| p->ty = ObjName; |
| return True; |
| } |
| if (VG_(strcmp)(p->name, "...") == 0) { |
| p->name = NULL; |
| p->ty = DotDotDot; |
| return True; |
| } |
| VG_(printf)("location should be \"...\", or should start " |
| "with \"fun:\" or \"obj:\"\n"); |
| return False; |
| } |
| |
| |
| /* Look for "tool" in a string like "tool1,tool2,tool3" */ |
| static Bool tool_name_present(Char *name, Char *names) |
| { |
| Bool found; |
| Char *s = NULL; /* Shut gcc up */ |
| Int len = VG_(strlen)(name); |
| |
| found = (NULL != (s = VG_(strstr)(names, name)) && |
| (s == names || *(s-1) == ',') && |
| (*(s+len) == ',' || *(s+len) == '\0') |
| ); |
| |
| return found; |
| } |
| |
| /* Read suppressions from the file specified in VG_(clo_suppressions) |
| and place them in the suppressions list. If there's any difficulty |
| doing this, just give up -- there's no point in trying to recover. |
| */ |
| static void load_one_suppressions_file ( Char* filename ) |
| { |
| SysRes sres; |
| Int fd, i, j, lineno = 0; |
| Bool eof; |
| SizeT nBuf = 200; |
| Char* buf = VG_(malloc)("errormgr.losf.1", nBuf); |
| Char* tool_names; |
| Char* supp_name; |
| Char* err_str = NULL; |
| SuppLoc tmp_callers[VG_MAX_SUPP_CALLERS]; |
| |
| // Check it's not a directory. |
| if (VG_(is_dir)( filename )) { |
| if (VG_(clo_xml)) |
| VG_(printf_xml)("</valgrindoutput>\n"); |
| VG_(umsg)("FATAL: suppressions file \"%s\" is a directory\n", filename ); |
| VG_(exit)(1); |
| } |
| |
| // Open the suppression file. |
| sres = VG_(open)( filename, VKI_O_RDONLY, 0 ); |
| if (sr_isError(sres)) { |
| if (VG_(clo_xml)) |
| VG_(printf_xml)("</valgrindoutput>\n"); |
| VG_(umsg)("FATAL: can't open suppressions file \"%s\"\n", filename ); |
| VG_(exit)(1); |
| } |
| fd = sr_Res(sres); |
| |
| # define BOMB(S) { err_str = S; goto syntax_error; } |
| |
| while (True) { |
| /* Assign and initialise the two suppression halves (core and tool) */ |
| Supp* supp; |
| supp = VG_(arena_malloc)(VG_AR_CORE, "errormgr.losf.1", |
| sizeof(Supp)); |
| supp->count = 0; |
| |
| // Initialise temporary reading-in buffer. |
| for (i = 0; i < VG_MAX_SUPP_CALLERS; i++) { |
| tmp_callers[i].ty = NoName; |
| tmp_callers[i].name = NULL; |
| } |
| |
| supp->string = supp->extra = NULL; |
| |
| eof = VG_(get_line) ( fd, &buf, &nBuf, &lineno ); |
| if (eof) break; |
| |
| if (!VG_STREQ(buf, "{")) BOMB("expected '{' or end-of-file"); |
| |
| eof = VG_(get_line) ( fd, &buf, &nBuf, &lineno ); |
| |
| if (eof || VG_STREQ(buf, "}")) BOMB("unexpected '}'"); |
| |
| supp->sname = VG_(arena_strdup)(VG_AR_CORE, "errormgr.losf.2", buf); |
| |
| eof = VG_(get_line) ( fd, &buf, &nBuf, &lineno ); |
| |
| if (eof) BOMB("unexpected end-of-file"); |
| |
| /* Check it has the "tool1,tool2,...:supp" form (look for ':') */ |
| i = 0; |
| while (True) { |
| if (buf[i] == ':') break; |
| if (buf[i] == '\0') BOMB("malformed 'tool1,tool2,...:supp' line"); |
| i++; |
| } |
| buf[i] = '\0'; /* Replace ':', splitting into two strings */ |
| |
| tool_names = & buf[0]; |
| supp_name = & buf[i+1]; |
| |
| if (VG_(needs).core_errors && tool_name_present("core", tool_names)) |
| { |
| // A core suppression |
| //(example code, see comment on CoreSuppKind above) |
| //if (VG_STREQ(supp_name, "Thread")) |
| // supp->skind = ThreadSupp; |
| //else |
| BOMB("unknown core suppression type"); |
| } |
| else if (VG_(needs).tool_errors && |
| tool_name_present(VG_(details).name, tool_names)) |
| { |
| // A tool suppression |
| if (VG_TDICT_CALL(tool_recognised_suppression, supp_name, supp)) { |
| /* Do nothing, function fills in supp->skind */ |
| } else { |
| BOMB("unknown tool suppression type"); |
| } |
| } |
| else { |
| // Ignore rest of suppression |
| while (True) { |
| eof = VG_(get_line) ( fd, &buf, &nBuf, &lineno ); |
| if (eof) BOMB("unexpected end-of-file"); |
| if (VG_STREQ(buf, "}")) |
| break; |
| } |
| continue; |
| } |
| |
| if (VG_(needs).tool_errors && |
| !VG_TDICT_CALL(tool_read_extra_suppression_info, |
| fd, &buf, &nBuf, supp)) |
| { |
| BOMB("bad or missing extra suppression info"); |
| } |
| |
| /* the main frame-descriptor reading loop */ |
| i = 0; |
| while (True) { |
| eof = VG_(get_line) ( fd, &buf, &nBuf, &lineno ); |
| if (eof) |
| BOMB("unexpected end-of-file"); |
| if (VG_STREQ(buf, "}")) { |
| if (i > 0) { |
| break; |
| } else { |
| BOMB("missing stack trace"); |
| } |
| } |
| if (i == VG_MAX_SUPP_CALLERS) |
| BOMB("too many callers in stack trace"); |
| if (i > 0 && i >= VG_(clo_backtrace_size)) |
| break; |
| tmp_callers[i].name = VG_(arena_strdup)(VG_AR_CORE, |
| "errormgr.losf.3", buf); |
| if (!setLocationTy(&(tmp_callers[i]))) |
| BOMB("location should be \"...\", or should start " |
| "with \"fun:\" or \"obj:\""); |
| i++; |
| } |
| |
| // If the num callers is >= VG_(clo_backtrace_size), ignore any extra |
| // lines and grab the '}'. |
| if (!VG_STREQ(buf, "}")) { |
| do { |
| eof = VG_(get_line) ( fd, &buf, &nBuf, &lineno ); |
| } while (!eof && !VG_STREQ(buf, "}")); |
| } |
| |
| // Reject entries which are entirely composed of frame |
| // level wildcards. |
| vg_assert(i > 0); // guaranteed by frame-descriptor reading loop |
| for (j = 0; j < i; j++) { |
| if (tmp_callers[j].ty == FunName || tmp_callers[j].ty == ObjName) |
| break; |
| vg_assert(tmp_callers[j].ty == DotDotDot); |
| } |
| vg_assert(j >= 0 && j <= i); |
| if (j == i) { |
| // we didn't find any non-"..." entries |
| BOMB("suppression must contain at least one location " |
| "line which is not \"...\""); |
| } |
| |
| // Copy tmp_callers[] into supp->callers[] |
| supp->n_callers = i; |
| supp->callers = VG_(arena_malloc)(VG_AR_CORE, "errormgr.losf.4", |
| i*sizeof(SuppLoc)); |
| for (i = 0; i < supp->n_callers; i++) { |
| supp->callers[i] = tmp_callers[i]; |
| } |
| |
| supp->next = suppressions; |
| suppressions = supp; |
| } |
| VG_(free)(buf); |
| VG_(close)(fd); |
| return; |
| |
| syntax_error: |
| if (VG_(clo_xml)) |
| VG_(printf_xml)("</valgrindoutput>\n"); |
| VG_(umsg)("FATAL: in suppressions file \"%s\" near line %d:\n", |
| filename, lineno ); |
| VG_(umsg)(" %s\n", err_str ); |
| |
| VG_(close)(fd); |
| VG_(umsg)("exiting now.\n"); |
| VG_(exit)(1); |
| |
| # undef BOMB |
| } |
| |
| |
| void VG_(load_suppressions) ( void ) |
| { |
| Int i; |
| suppressions = NULL; |
| for (i = 0; i < VG_(clo_n_suppressions); i++) { |
| if (VG_(clo_verbosity) > 1) { |
| VG_(dmsg)("Reading suppressions file: %s\n", |
| VG_(clo_suppressions)[i] ); |
| } |
| load_one_suppressions_file( VG_(clo_suppressions)[i] ); |
| } |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Matching errors to suppressions ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Parameterising functions for the use of VG_(generic_match) in |
| suppression-vs-error matching. The suppression frames (SuppLoc) |
| play the role of 'pattern'-element, and the error frames (IPs, |
| hence simply Addrs) play the role of 'input'. In short then, we're |
| matching a sequence of Addrs against a pattern composed of a |
| sequence of SuppLocs. |
| */ |
| static Bool supploc_IsStar ( void* supplocV ) |
| { |
| SuppLoc* supploc = (SuppLoc*)supplocV; |
| return supploc->ty == DotDotDot; |
| } |
| |
| static Bool supploc_IsQuery ( void* supplocV ) |
| { |
| return False; /* there's no '?' equivalent in the supp syntax */ |
| } |
| |
| static Bool supp_pattEQinp ( void* supplocV, void* addrV ) |
| { |
| SuppLoc* supploc = (SuppLoc*)supplocV; /* PATTERN */ |
| Addr ip = *(Addr*)addrV; /* INPUT */ |
| |
| Char caller_name[ERRTXT_LEN]; |
| caller_name[0] = 0; |
| |
| /* So, does this IP address match this suppression-line? */ |
| switch (supploc->ty) { |
| case DotDotDot: |
| /* supp_pattEQinp is a callback from VG_(generic_match). As |
| per the spec thereof (see include/pub_tool_seqmatch.h), we |
| should never get called with a pattern value for which the |
| _IsStar or _IsQuery function would return True. Hence |
| this can't happen. */ |
| vg_assert(0); |
| case ObjName: |
| /* Get the object name into 'caller_name', or "???" |
| if unknown. */ |
| if (!VG_(get_objname)(ip, caller_name, ERRTXT_LEN)) |
| VG_(strcpy)(caller_name, "???"); |
| break; |
| case FunName: |
| /* Get the function name into 'caller_name', or "???" |
| if unknown. */ |
| // Nb: C++-mangled names are used in suppressions. Do, though, |
| // Z-demangle them, since otherwise it's possible to wind |
| // up comparing "malloc" in the suppression against |
| // "_vgrZU_libcZdsoZa_malloc" in the backtrace, and the |
| // two of them need to be made to match. |
| if (!VG_(get_fnname_no_cxx_demangle)(ip, caller_name, ERRTXT_LEN)) |
| VG_(strcpy)(caller_name, "???"); |
| break; |
| default: |
| vg_assert(0); |
| } |
| |
| /* So now we have the function or object name in caller_name, and |
| the pattern (at the character level) to match against is in |
| supploc->name. Hence (and leading to a re-entrant call of |
| VG_(generic_match)): */ |
| return VG_(string_match)(supploc->name, caller_name); |
| } |
| |
| ///////////////////////////////////////////////////// |
| |
| static Bool supp_matches_callers(Error* err, Supp* su) |
| { |
| /* Unwrap the args and set up the correct parameterisation of |
| VG_(generic_match), using supploc_IsStar, supploc_IsQuery and |
| supp_pattEQinp. */ |
| /* note, StackTrace === Addr* */ |
| StackTrace ips = VG_(get_ExeContext_StackTrace)(err->where); |
| UWord n_ips = VG_(get_ExeContext_n_ips)(err->where); |
| SuppLoc* supps = su->callers; |
| UWord n_supps = su->n_callers; |
| UWord szbPatt = sizeof(SuppLoc); |
| UWord szbInput = sizeof(Addr); |
| Bool matchAll = False; /* we just want to match a prefix */ |
| return |
| VG_(generic_match)( |
| matchAll, |
| /*PATT*/supps, szbPatt, n_supps, 0/*initial Ix*/, |
| /*INPUT*/ips, szbInput, n_ips, 0/*initial Ix*/, |
| supploc_IsStar, supploc_IsQuery, supp_pattEQinp |
| ); |
| } |
| |
| ///////////////////////////////////////////////////// |
| |
| static |
| Bool supp_matches_error(Supp* su, Error* err) |
| { |
| switch (su->skind) { |
| //(example code, see comment on CoreSuppKind above) |
| //case ThreadSupp: |
| // return (err->ekind == ThreadErr); |
| default: |
| if (VG_(needs).tool_errors) { |
| return VG_TDICT_CALL(tool_error_matches_suppression, err, su); |
| } else { |
| VG_(printf)( |
| "\nUnhandled suppression type: %u. VG_(needs).tool_errors\n" |
| "probably needs to be set.\n", |
| err->ekind); |
| VG_(tool_panic)("unhandled suppression type"); |
| } |
| } |
| } |
| |
| ///////////////////////////////////////////////////// |
| |
| /* Does an error context match a suppression? ie is this a suppressible |
| error? If so, return a pointer to the Supp record, otherwise NULL. |
| Tries to minimise the number of symbol searches since they are expensive. |
| */ |
| static Supp* is_suppressible_error ( Error* err ) |
| { |
| Supp* su; |
| Supp* su_prev; |
| |
| /* stats gathering */ |
| em_supplist_searches++; |
| |
| /* See if the error context matches any suppression. */ |
| su_prev = NULL; |
| for (su = suppressions; su != NULL; su = su->next) { |
| em_supplist_cmps++; |
| if (supp_matches_error(su, err) && supp_matches_callers(err, su)) { |
| /* got a match. Move this entry to the head of the list |
| in the hope of making future searches cheaper. */ |
| if (su_prev) { |
| vg_assert(su_prev->next == su); |
| su_prev->next = su->next; |
| su->next = suppressions; |
| suppressions = su; |
| } |
| return su; |
| } |
| su_prev = su; |
| } |
| return NULL; /* no matches */ |
| } |
| |
| /* Show accumulated error-list and suppression-list search stats. |
| */ |
| void VG_(print_errormgr_stats) ( void ) |
| { |
| VG_(dmsg)( |
| " errormgr: %'lu supplist searches, %'lu comparisons during search\n", |
| em_supplist_searches, em_supplist_cmps |
| ); |
| VG_(dmsg)( |
| " errormgr: %'lu errlist searches, %'lu comparisons during search\n", |
| em_errlist_searches, em_errlist_cmps |
| ); |
| } |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |