| |
| /*--------------------------------------------------------------------*/ |
| /*--- Management of error messages. vg_errcontext.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, an extensible x86 protected-mode |
| emulator for monitoring program execution on x86-Unixes. |
| |
| Copyright (C) 2000-2004 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 "core.h" |
| |
| /*------------------------------------------------------------*/ |
| /*--- Globals ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* The list of error contexts found, both suppressed and unsuppressed. |
| Initially empty, and grows as errors are detected. */ |
| static Error* vg_errors = NULL; |
| |
| /* The list of suppression directives, as read from the specified |
| suppressions file. */ |
| static Supp* vg_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; |
| |
| /* forwards ... */ |
| static Supp* is_suppressible_error ( Error* err ); |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Error 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 { |
| PThreadErr = -1, // Pthreading error |
| } |
| CoreErrorKind; |
| |
| /* 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/tool.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; |
| // NULL if unsuppressed; or ptr to suppression record. |
| Supp* supp; |
| Int count; |
| ThreadId tid; |
| |
| // The tool-specific part |
| ExeContext* where; // Initialised by core |
| Int 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 { |
| PThreadSupp = -1, /* Matches PThreadErr */ |
| } |
| CoreSuppKind; |
| |
| /* For each caller specified for a suppression, record the nature of |
| the caller name. Not of interest to tools. */ |
| typedef |
| enum { |
| ObjName, /* Name is of an shared object file. */ |
| FunName /* Name is of a function. */ |
| } |
| SuppLocTy; |
| |
| /* Suppressions. Tools can get/set tool-relevant parts with functions |
| declared in include/tool.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. |
| /* First two (name of fn where err occurs, and immediate caller) |
| * are mandatory; extra two are optional. */ |
| SuppLocTy caller_ty[VG_N_SUPP_CALLERS]; |
| Char* caller [VG_N_SUPP_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 ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Compare error contexts, to detect duplicates. Note that if they |
| are otherwise the same, the faulting addrs and associated rwoffsets |
| are allowed to be different. */ |
| 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) { |
| case PThreadErr: |
| vg_assert(VG_(needs).core_errors); |
| if (e1->string == e2->string) |
| return True; |
| if (0 == VG_(strcmp)(e1->string, e2->string)) |
| return True; |
| return False; |
| default: |
| if (VG_(needs).skin_errors) |
| return SK_(eq_SkinError)(res, e1, e2); |
| else { |
| VG_(printf)("\nUnhandled error type: %u. VG_(needs).skin_errors\n" |
| "probably needs to be set.\n", |
| e1->ekind); |
| VG_(skin_panic)("unhandled error type"); |
| } |
| } |
| } |
| |
| static void pp_Error ( Error* err, Bool printCount ) |
| { |
| if (printCount) |
| VG_(message)(Vg_UserMsg, "Observed %d times:", err->count ); |
| if (err->tid > 1) |
| VG_(message)(Vg_UserMsg, "Thread %d:", err->tid ); |
| |
| switch (err->ekind) { |
| case PThreadErr: |
| vg_assert(VG_(needs).core_errors); |
| VG_(message)(Vg_UserMsg, "%s", err->string ); |
| VG_(pp_ExeContext)(err->where); |
| break; |
| default: |
| if (VG_(needs).skin_errors) |
| SK_(pp_SkinError)( err ); |
| else { |
| VG_(printf)("\nUnhandled error type: %u. VG_(needs).skin_errors\n" |
| "probably needs to be set?\n", |
| err->ekind); |
| VG_(skin_panic)("unhandled error type"); |
| } |
| } |
| } |
| |
| /* 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; |
| |
| if (*clo == False) |
| return False; |
| |
| VG_(message)(Vg_UserMsg, ""); |
| |
| 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; |
| } |
| |
| |
| /* I've gone all object-oriented... initialisation depends on where the |
| error comes from: |
| |
| - If from generated code (tst == NULL), the %EIP/%EBP values that we |
| need in order to attach GDB are picked up out of VG_(baseBlock) rather |
| than from the thread table (vg_threads in vg_scheduler.c). |
| |
| - If not from generated code but in response to requests passed back to |
| the scheduler (tst != NULL), we pick up %EIP/%EBP values from the |
| stored thread state, not from VG_(baseBlock). |
| */ |
| static __inline__ |
| void construct_error ( Error* err, ThreadId tid, ErrorKind ekind, Addr a, |
| Char* s, void* extra, ExeContext* where ) |
| { |
| sk_assert(tid < VG_N_THREADS); |
| |
| /* Core-only parts */ |
| err->next = NULL; |
| err->supp = NULL; |
| err->count = 1; |
| err->tid = tid; |
| if (NULL == where) |
| err->where = VG_(get_ExeContext)( tid ); |
| 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 void gen_suppression(Error* err) |
| { |
| Int i; |
| UChar buf[M_VG_ERRTXT]; |
| Bool main_done = False; |
| ExeContext* ec = VG_(get_error_where)(err); |
| Int stop_at = VG_(clo_backtrace_size); |
| |
| if (stop_at > 4) stop_at = 4; /* At most four names */ |
| vg_assert(stop_at > 0); |
| |
| VG_(printf)("{\n"); |
| VG_(printf)(" <insert a suppression name here>\n"); |
| |
| if (PThreadErr == err->ekind) { |
| VG_(printf)(" core:PThread\n"); |
| |
| } else { |
| Char* name = SK_(get_error_name)(err); |
| if (NULL == name) { |
| VG_(message)(Vg_UserMsg, |
| "(tool does not allow error to be suppressed)"); |
| return; |
| } |
| VG_(printf)(" %s:%s\n", VG_(details).name, name); |
| SK_(print_extra_suppression_info)(err); |
| } |
| |
| /* This loop condensed from VG_(mini_stack_dump)() */ |
| i = 0; |
| do { |
| Addr eip = ec->eips[i]; |
| if (i > 0) |
| eip -= MIN_INSTR_SIZE; // point to calling line |
| if ( VG_(get_fnname_nodemangle) (eip, buf, M_VG_ERRTXT) ) { |
| // Stop after "main"; if main() is recursive, stop after last main(). |
| |
| if ( ! VG_(clo_show_below_main)) { |
| if (VG_STREQ(buf, "main")) |
| main_done = True; |
| else if (main_done) |
| break; |
| } |
| VG_(printf)(" fun:%s\n", buf); |
| } else if ( VG_(get_objname)(eip, buf, M_VG_ERRTXT) ) { |
| VG_(printf)(" obj:%s\n", buf); |
| } else { |
| VG_(printf)(" ???:??? " |
| "# unknown, suppression will not work, sorry\n"); |
| } |
| i++; |
| } while (i < stop_at && ec->eips[i] != 0); |
| |
| VG_(printf)("}\n"); |
| } |
| |
| static |
| void do_actions_on_error(Error* err, Bool allow_db_attach) |
| { |
| /* Perhaps we want a debugger attach at this point? */ |
| if (allow_db_attach && |
| VG_(is_action_requested)( "Attach to debugger", & VG_(clo_db_attach) )) |
| { |
| VG_(printf)("starting debugger\n"); |
| VG_(start_debugger)( err->tid ); |
| } |
| /* Or maybe we want to generate the error's suppression? */ |
| if (VG_(is_action_requested)( "Print suppression", |
| & VG_(clo_gen_suppressions) )) { |
| gen_suppression(err); |
| } |
| } |
| |
| /* Shared between VG_(maybe_record_error)() and VG_(unique_error)(), |
| just for pretty printing purposes. */ |
| static Bool is_first_shown_context = True; |
| |
| /* 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; |
| static Int vg_n_errs_shown = 0; |
| |
| /* After M_VG_COLLECT_NO_ERRORS_AFTER_SHOWN different errors have |
| been found, or M_VG_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) |
| && (vg_n_errs_shown >= M_VG_COLLECT_NO_ERRORS_AFTER_SHOWN |
| || n_errs_found >= M_VG_COLLECT_NO_ERRORS_AFTER_FOUND)) { |
| if (!stopping_message) { |
| VG_(message)(Vg_UserMsg, ""); |
| |
| if (vg_n_errs_shown >= M_VG_COLLECT_NO_ERRORS_AFTER_SHOWN) { |
| VG_(message)(Vg_UserMsg, |
| "More than %d different errors detected. " |
| "I'm not reporting any more.", |
| M_VG_COLLECT_NO_ERRORS_AFTER_SHOWN ); |
| } else { |
| VG_(message)(Vg_UserMsg, |
| "More than %d total errors detected. " |
| "I'm not reporting any more.", |
| M_VG_COLLECT_NO_ERRORS_AFTER_FOUND ); |
| } |
| |
| VG_(message)(Vg_UserMsg, |
| "Final error counts will be inaccurate. Go fix your program!"); |
| VG_(message)(Vg_UserMsg, |
| "Rerun with --error-limit=no to disable this cutoff. Note"); |
| VG_(message)(Vg_UserMsg, |
| "that errors may occur in your program without prior warning from"); |
| VG_(message)(Vg_UserMsg, |
| "Valgrind, because errors are no longer being displayed."); |
| VG_(message)(Vg_UserMsg, ""); |
| stopping_message = True; |
| } |
| return; |
| } |
| |
| /* After M_VG_COLLECT_ERRORS_SLOWLY_AFTER different errors have |
| been found, be much more conservative about collecting new |
| ones. */ |
| if (vg_n_errs_shown >= M_VG_COLLECT_ERRORS_SLOWLY_AFTER) { |
| exe_res = Vg_LowRes; |
| if (!slowdown_message) { |
| VG_(message)(Vg_UserMsg, ""); |
| VG_(message)(Vg_UserMsg, |
| "More than %d errors detected. Subsequent errors", |
| M_VG_COLLECT_ERRORS_SLOWLY_AFTER); |
| VG_(message)(Vg_UserMsg, |
| "will still be recorded, but in less detail than before."); |
| 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. */ |
| p = vg_errors; |
| p_prev = NULL; |
| while (p != NULL) { |
| 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. */ |
| if (p_prev != NULL) { |
| vg_assert(p_prev->next == p); |
| p_prev->next = p->next; |
| p->next = vg_errors; |
| vg_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 SK_(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 |
| SK_(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, sizeof(Error)); |
| *p = err; |
| |
| /* update `extra', for non-core errors (core ones don't use 'extra') */ |
| if (VG_(needs).skin_errors && PThreadErr != ekind) { |
| extra_size = SK_(update_extra)(p); |
| |
| /* copy block pointed to by `extra', if there is one */ |
| if (NULL != p->extra && 0 != extra_size) { |
| void* new_extra = VG_(malloc)(extra_size); |
| VG_(memcpy)(new_extra, p->extra, extra_size); |
| p->extra = new_extra; |
| } |
| } |
| |
| p->next = vg_errors; |
| p->supp = is_suppressible_error(&err); |
| vg_errors = p; |
| if (p->supp == NULL) { |
| n_errs_found++; |
| if (!is_first_shown_context) |
| VG_(message)(Vg_UserMsg, ""); |
| pp_Error(p, False); |
| is_first_shown_context = False; |
| vg_n_errs_shown++; |
| do_actions_on_error(p, /*allow_db_attach*/True); |
| } else { |
| 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; |
| |
| /* 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 SK_(update_extra), because that can |
| have an affect on whether it's suppressed. Ignore the size return |
| value of SK_(update_extra), because we're not copying `extra'. */ |
| (void)SK_(update_extra)(&err); |
| |
| if (NULL == is_suppressible_error(&err)) { |
| if (count_error) |
| n_errs_found++; |
| |
| if (print_error) { |
| if (!is_first_shown_context) |
| VG_(message)(Vg_UserMsg, ""); |
| pp_Error(&err, False); |
| is_first_shown_context = False; |
| } |
| do_actions_on_error(&err, allow_db_attach); |
| |
| return False; |
| |
| } else { |
| n_errs_suppressed++; |
| return True; |
| } |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Exported fns ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* These are called not from generated code but from the scheduler */ |
| |
| void VG_(record_pthread_error) ( ThreadId tid, Char* msg ) |
| { |
| if (! VG_(needs).core_errors) return; |
| VG_(maybe_record_error)( tid, PThreadErr, /*addr*/0, msg, /*extra*/NULL ); |
| } |
| |
| void VG_(show_all_errors) ( void ) |
| { |
| Int i, n_min; |
| Int n_err_contexts, n_supp_contexts; |
| Error *p, *p_min; |
| Supp *su; |
| Bool any_supp; |
| |
| if (VG_(clo_verbosity) == 0) |
| return; |
| |
| n_err_contexts = 0; |
| for (p = vg_errors; p != NULL; p = p->next) { |
| if (p->supp == NULL) |
| n_err_contexts++; |
| } |
| |
| n_supp_contexts = 0; |
| for (su = vg_suppressions; su != NULL; su = su->next) { |
| if (su->count > 0) |
| n_supp_contexts++; |
| } |
| VG_(message)(Vg_UserMsg, |
| "ERROR SUMMARY: " |
| "%d errors from %d contexts (suppressed: %d from %d)", |
| n_errs_found, n_err_contexts, |
| n_errs_suppressed, n_supp_contexts ); |
| |
| if (VG_(clo_verbosity) <= 1) |
| return; |
| |
| /* Print the contexts in order of increasing error count. */ |
| for (i = 0; i < n_err_contexts; i++) { |
| n_min = (1 << 30) - 1; |
| p_min = NULL; |
| for (p = vg_errors; p != NULL; p = p->next) { |
| if (p->supp != NULL) continue; |
| if (p->count < n_min) { |
| n_min = p->count; |
| p_min = p; |
| } |
| } |
| if (p_min == NULL) VG_(skin_panic)("show_all_errors()"); |
| |
| VG_(message)(Vg_UserMsg, ""); |
| VG_(message)(Vg_UserMsg, "%d errors in context %d of %d:", |
| p_min->count, |
| i+1, n_err_contexts); |
| pp_Error( p_min, False ); |
| |
| if ((i+1 == VG_(clo_dump_error))) { |
| VG_(translate) ( 0 /* dummy ThreadId; irrelevant due to debugging*/, |
| p_min->where->eips[0], /*debugging*/True); |
| } |
| |
| p_min->count = 1 << 30; |
| } |
| |
| if (n_supp_contexts > 0) |
| VG_(message)(Vg_DebugMsg, ""); |
| any_supp = False; |
| for (su = vg_suppressions; su != NULL; su = su->next) { |
| if (su->count > 0) { |
| any_supp = True; |
| VG_(message)(Vg_DebugMsg, "supp: %4d %s", su->count, su->sname); |
| } |
| } |
| |
| if (n_err_contexts > 0) { |
| if (any_supp) |
| VG_(message)(Vg_UserMsg, ""); |
| VG_(message)(Vg_UserMsg, |
| "IN SUMMARY: " |
| "%d errors from %d contexts (suppressed: %d from %d)", |
| n_errs_found, n_err_contexts, n_errs_suppressed, |
| n_supp_contexts ); |
| VG_(message)(Vg_UserMsg, ""); |
| } |
| } |
| |
| /*------------------------------------------------------------*/ |
| /*--- Standard suppressions ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* Get a non-blank, non-comment line of at most nBuf chars from fd. |
| Skips leading spaces on the line. Return True if EOF was hit instead. |
| */ |
| |
| #define VG_ISSPACE(ch) (((ch)==' ') || ((ch)=='\n') || ((ch)=='\t')) |
| |
| Bool VG_(get_line) ( Int fd, Char* buf, Int nBuf ) |
| { |
| Char ch; |
| Int n, i; |
| while (True) { |
| /* First, read until a non-blank char appears. */ |
| while (True) { |
| n = VG_(read)(fd, &ch, 1); |
| if (n == 1 && !VG_ISSPACE(ch)) break; |
| if (n == 0) return True; |
| } |
| |
| /* Now, read the line into buf. */ |
| i = 0; |
| buf[i++] = ch; buf[i] = 0; |
| while (True) { |
| n = VG_(read)(fd, &ch, 1); |
| if (n == 0) return False; /* the next call will return True */ |
| if (ch == '\n') break; |
| if (i > 0 && i == nBuf-1) i--; |
| 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 ( Char** p_caller, SuppLocTy* p_ty ) |
| { |
| if (VG_(strncmp)(*p_caller, "fun:", 4) == 0) { |
| (*p_caller) += 4; |
| *p_ty = FunName; |
| return True; |
| } |
| if (VG_(strncmp)(*p_caller, "obj:", 4) == 0) { |
| (*p_caller) += 4; |
| *p_ty = ObjName; |
| return True; |
| } |
| VG_(printf)("location should start with fun: or obj:\n"); |
| return False; |
| } |
| |
| |
| /* Look for "tool" in a string like "tool1,tool2,tool3" */ |
| static __inline__ |
| 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 ) |
| { |
| # define N_BUF 200 |
| Int fd, i; |
| Bool eof; |
| Char buf[N_BUF+1]; |
| Char* tool_names; |
| Char* supp_name; |
| |
| fd = VG_(open)( filename, VKI_O_RDONLY, 0 ); |
| if (fd < 0) { |
| VG_(message)(Vg_UserMsg, "FATAL: can't open suppressions file `%s'", |
| filename ); |
| VG_(exit)(1); |
| } |
| |
| while (True) { |
| /* Assign and initialise the two suppression halves (core and tool) */ |
| Supp* supp; |
| supp = VG_(arena_malloc)(VG_AR_CORE, sizeof(Supp)); |
| supp->count = 0; |
| for (i = 0; i < VG_N_SUPP_CALLERS; i++) supp->caller[i] = NULL; |
| supp->string = supp->extra = NULL; |
| |
| eof = VG_(get_line) ( fd, buf, N_BUF ); |
| if (eof) break; |
| |
| if (!VG_STREQ(buf, "{")) goto syntax_error; |
| |
| eof = VG_(get_line) ( fd, buf, N_BUF ); |
| if (eof || VG_STREQ(buf, "}")) goto syntax_error; |
| supp->sname = VG_(arena_strdup)(VG_AR_CORE, buf); |
| |
| eof = VG_(get_line) ( fd, buf, N_BUF ); |
| |
| if (eof) goto syntax_error; |
| |
| /* Check it has the "skin1,skin2,...:supp" form (look for ':') */ |
| i = 0; |
| while (True) { |
| if (buf[i] == ':') break; |
| if (buf[i] == '\0') goto syntax_error; |
| i++; |
| } |
| buf[i] = '\0'; /* Replace ':', splitting into two strings */ |
| |
| tool_names = & buf[0]; |
| supp_name = & buf[i+1]; |
| |
| /* Is it a core suppression? */ |
| if (VG_(needs).core_errors && tool_name_present("core", tool_names)) |
| { |
| if (VG_STREQ(supp_name, "PThread")) |
| supp->skind = PThreadSupp; |
| else |
| goto syntax_error; |
| } |
| |
| /* Is it a tool suppression? */ |
| else if (VG_(needs).skin_errors && |
| tool_name_present(VG_(details).name, tool_names)) |
| { |
| if (SK_(recognised_suppression)(supp_name, supp)) |
| { |
| /* Do nothing, function fills in supp->skind */ |
| } else |
| goto syntax_error; |
| } |
| |
| else { |
| /* Ignore rest of suppression */ |
| while (True) { |
| eof = VG_(get_line) ( fd, buf, N_BUF ); |
| if (eof) goto syntax_error; |
| if (VG_STREQ(buf, "}")) |
| break; |
| } |
| continue; |
| } |
| |
| if (VG_(needs).skin_errors && |
| !SK_(read_extra_suppression_info)(fd, buf, N_BUF, supp)) |
| goto syntax_error; |
| |
| /* "i > 0" ensures at least one caller read. */ |
| for (i = 0; i <= VG_N_SUPP_CALLERS; i++) { |
| eof = VG_(get_line) ( fd, buf, N_BUF ); |
| if (eof) goto syntax_error; |
| if (i > 0 && VG_STREQ(buf, "}")) |
| break; |
| if (i == VG_N_SUPP_CALLERS) |
| break; |
| supp->caller[i] = VG_(arena_strdup)(VG_AR_CORE, buf); |
| if (!setLocationTy(&(supp->caller[i]), &(supp->caller_ty[i]))) |
| goto syntax_error; |
| } |
| |
| /* make sure to grab the '}' if the num callers is >= |
| VG_N_SUPP_CALLERS */ |
| if (!VG_STREQ(buf, "}")) { |
| do { |
| eof = VG_(get_line) ( fd, buf, N_BUF ); |
| } while (!eof && !VG_STREQ(buf, "}")); |
| } |
| |
| supp->next = vg_suppressions; |
| vg_suppressions = supp; |
| } |
| VG_(close)(fd); |
| return; |
| |
| syntax_error: |
| if (eof) { |
| VG_(message)(Vg_UserMsg, |
| "FATAL: in suppressions file `%s': unexpected EOF", |
| filename ); |
| } else { |
| VG_(message)(Vg_UserMsg, |
| "FATAL: in suppressions file: `%s': syntax error on: %s", |
| filename, buf ); |
| } |
| VG_(close)(fd); |
| VG_(message)(Vg_UserMsg, "exiting now."); |
| VG_(exit)(1); |
| |
| # undef N_BUF |
| } |
| |
| |
| void VG_(load_suppressions) ( void ) |
| { |
| Int i; |
| vg_suppressions = NULL; |
| for (i = 0; i < VG_(clo_n_suppressions); i++) { |
| if (VG_(clo_verbosity) > 1) { |
| VG_(message)(Vg_UserMsg, "Reading suppressions file: %s", |
| VG_(clo_suppressions)[i] ); |
| } |
| load_one_suppressions_file( VG_(clo_suppressions)[i] ); |
| } |
| } |
| |
| /* Return the name of an erring fn in a way which is useful |
| for comparing against the contents of a suppressions file. |
| Doesn't demangle the fn name, because we want to refer to |
| mangled names in the suppressions file. |
| */ |
| static void get_objname_fnname ( Addr a, Char* obj_buf, Int n_obj_buf, |
| Char* fun_buf, Int n_fun_buf ) |
| { |
| (void)VG_(get_objname) ( a, obj_buf, n_obj_buf ); |
| (void)VG_(get_fnname_nodemangle)( a, fun_buf, n_fun_buf ); |
| } |
| |
| static __inline__ |
| Bool supp_matches_error(Supp* su, Error* err) |
| { |
| switch (su->skind) { |
| case PThreadSupp: |
| return (err->ekind == PThreadErr); |
| default: |
| if (VG_(needs).skin_errors) { |
| return SK_(error_matches_suppression)(err, su); |
| } else { |
| VG_(printf)( |
| "\nUnhandled suppression type: %u. VG_(needs).skin_errors\n" |
| "probably needs to be set.\n", |
| err->ekind); |
| VG_(skin_panic)("unhandled suppression type"); |
| } |
| } |
| } |
| |
| static __inline__ |
| Bool supp_matches_callers(Supp* su, Char caller_obj[][M_VG_ERRTXT], |
| Char caller_fun[][M_VG_ERRTXT]) |
| { |
| Int i; |
| |
| for (i = 0; i < VG_N_SUPP_CALLERS && su->caller[i] != NULL; i++) { |
| switch (su->caller_ty[i]) { |
| case ObjName: if (VG_(string_match)(su->caller[i], |
| caller_obj[i])) break; |
| return False; |
| case FunName: if (VG_(string_match)(su->caller[i], |
| caller_fun[i])) break; |
| return False; |
| default: VG_(skin_panic)("supp_matches_callers"); |
| } |
| } |
| |
| /* If we reach here, it's a match */ |
| return True; |
| } |
| |
| /* 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 ) |
| { |
| Int i; |
| |
| Char caller_obj[VG_N_SUPP_CALLERS][M_VG_ERRTXT]; |
| Char caller_fun[VG_N_SUPP_CALLERS][M_VG_ERRTXT]; |
| |
| Supp* su; |
| |
| /* get_objname_fnname() writes the function name and object name if |
| it finds them in the debug info. So the strings in the suppression |
| file should match these. |
| */ |
| |
| /* Initialise these strs so they are always safe to compare, even |
| if get_objname_fnname doesn't write anything to them. */ |
| for (i = 0; i < VG_N_SUPP_CALLERS; i++) |
| caller_obj[i][0] = caller_fun[i][0] = 0; |
| |
| for (i = 0; i < VG_N_SUPP_CALLERS && i < VG_(clo_backtrace_size); i++) { |
| get_objname_fnname ( err->where->eips[i], caller_obj[i], M_VG_ERRTXT, |
| caller_fun[i], M_VG_ERRTXT ); |
| } |
| |
| /* See if the error context matches any suppression. */ |
| for (su = vg_suppressions; su != NULL; su = su->next) { |
| if (supp_matches_error(su, err) && |
| supp_matches_callers(su, caller_obj, caller_fun)) { |
| return su; |
| } |
| } |
| return NULL; /* no matches */ |
| } |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end vg_errcontext.c ---*/ |
| /*--------------------------------------------------------------------*/ |