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263 lines
9.3 KiB
263 lines
9.3 KiB
//===-- tsan_debugging.cpp ------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of ThreadSanitizer (TSan), a race detector.
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//
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// TSan debugging API implementation.
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//===----------------------------------------------------------------------===//
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#include "tsan_interface.h"
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#include "tsan_report.h"
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#include "tsan_rtl.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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using namespace __tsan;
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static const char *ReportTypeDescription(ReportType typ) {
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switch (typ) {
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case ReportTypeRace: return "data-race";
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case ReportTypeVptrRace: return "data-race-vptr";
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case ReportTypeUseAfterFree: return "heap-use-after-free";
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case ReportTypeVptrUseAfterFree: return "heap-use-after-free-vptr";
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case ReportTypeExternalRace: return "external-race";
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case ReportTypeThreadLeak: return "thread-leak";
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case ReportTypeMutexDestroyLocked: return "locked-mutex-destroy";
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case ReportTypeMutexDoubleLock: return "mutex-double-lock";
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case ReportTypeMutexInvalidAccess: return "mutex-invalid-access";
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case ReportTypeMutexBadUnlock: return "mutex-bad-unlock";
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case ReportTypeMutexBadReadLock: return "mutex-bad-read-lock";
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case ReportTypeMutexBadReadUnlock: return "mutex-bad-read-unlock";
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case ReportTypeSignalUnsafe: return "signal-unsafe-call";
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case ReportTypeErrnoInSignal: return "errno-in-signal-handler";
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case ReportTypeDeadlock: return "lock-order-inversion";
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// No default case so compiler warns us if we miss one
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}
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UNREACHABLE("missing case");
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}
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static const char *ReportLocationTypeDescription(ReportLocationType typ) {
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switch (typ) {
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case ReportLocationGlobal: return "global";
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case ReportLocationHeap: return "heap";
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case ReportLocationStack: return "stack";
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case ReportLocationTLS: return "tls";
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case ReportLocationFD: return "fd";
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// No default case so compiler warns us if we miss one
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}
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UNREACHABLE("missing case");
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}
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static void CopyTrace(SymbolizedStack *first_frame, void **trace,
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uptr trace_size) {
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uptr i = 0;
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for (SymbolizedStack *frame = first_frame; frame != nullptr;
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frame = frame->next) {
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trace[i++] = (void *)frame->info.address;
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if (i >= trace_size) break;
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}
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}
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// Meant to be called by the debugger.
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SANITIZER_INTERFACE_ATTRIBUTE
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void *__tsan_get_current_report() {
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return const_cast<ReportDesc*>(cur_thread()->current_report);
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_data(void *report, const char **description, int *count,
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int *stack_count, int *mop_count, int *loc_count,
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int *mutex_count, int *thread_count,
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int *unique_tid_count, void **sleep_trace,
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uptr trace_size) {
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const ReportDesc *rep = (ReportDesc *)report;
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*description = ReportTypeDescription(rep->typ);
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*count = rep->count;
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*stack_count = rep->stacks.Size();
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*mop_count = rep->mops.Size();
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*loc_count = rep->locs.Size();
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*mutex_count = rep->mutexes.Size();
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*thread_count = rep->threads.Size();
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*unique_tid_count = rep->unique_tids.Size();
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if (rep->sleep) CopyTrace(rep->sleep->frames, sleep_trace, trace_size);
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_tag(void *report, uptr *tag) {
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const ReportDesc *rep = (ReportDesc *)report;
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*tag = rep->tag;
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_stack(void *report, uptr idx, void **trace,
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uptr trace_size) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->stacks.Size());
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ReportStack *stack = rep->stacks[idx];
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if (stack) CopyTrace(stack->frames, trace, trace_size);
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return stack ? 1 : 0;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_mop(void *report, uptr idx, int *tid, void **addr,
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int *size, int *write, int *atomic, void **trace,
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uptr trace_size) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->mops.Size());
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ReportMop *mop = rep->mops[idx];
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*tid = mop->tid;
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*addr = (void *)mop->addr;
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*size = mop->size;
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*write = mop->write ? 1 : 0;
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*atomic = mop->atomic ? 1 : 0;
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if (mop->stack) CopyTrace(mop->stack->frames, trace, trace_size);
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_loc(void *report, uptr idx, const char **type,
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void **addr, uptr *start, uptr *size, int *tid,
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int *fd, int *suppressable, void **trace,
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uptr trace_size) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->locs.Size());
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ReportLocation *loc = rep->locs[idx];
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*type = ReportLocationTypeDescription(loc->type);
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*addr = (void *)loc->global.start;
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*start = loc->heap_chunk_start;
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*size = loc->heap_chunk_size;
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*tid = loc->tid;
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*fd = loc->fd;
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*suppressable = loc->suppressable;
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if (loc->stack) CopyTrace(loc->stack->frames, trace, trace_size);
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_loc_object_type(void *report, uptr idx,
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const char **object_type) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->locs.Size());
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ReportLocation *loc = rep->locs[idx];
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*object_type = GetObjectTypeFromTag(loc->external_tag);
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_mutex(void *report, uptr idx, uptr *mutex_id, void **addr,
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int *destroyed, void **trace, uptr trace_size) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->mutexes.Size());
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ReportMutex *mutex = rep->mutexes[idx];
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*mutex_id = mutex->id;
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*addr = (void *)mutex->addr;
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*destroyed = mutex->destroyed;
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if (mutex->stack) CopyTrace(mutex->stack->frames, trace, trace_size);
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_thread(void *report, uptr idx, int *tid, tid_t *os_id,
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int *running, const char **name, int *parent_tid,
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void **trace, uptr trace_size) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->threads.Size());
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ReportThread *thread = rep->threads[idx];
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*tid = thread->id;
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*os_id = thread->os_id;
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*running = thread->running;
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*name = thread->name;
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*parent_tid = thread->parent_tid;
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if (thread->stack) CopyTrace(thread->stack->frames, trace, trace_size);
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_report_unique_tid(void *report, uptr idx, int *tid) {
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const ReportDesc *rep = (ReportDesc *)report;
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CHECK_LT(idx, rep->unique_tids.Size());
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*tid = rep->unique_tids[idx];
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return 1;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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const char *__tsan_locate_address(uptr addr, char *name, uptr name_size,
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uptr *region_address_ptr,
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uptr *region_size_ptr) {
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uptr region_address = 0;
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uptr region_size = 0;
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const char *region_kind = nullptr;
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if (name && name_size > 0) name[0] = 0;
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if (IsMetaMem(addr)) {
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region_kind = "meta shadow";
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} else if (IsShadowMem(addr)) {
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region_kind = "shadow";
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} else {
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bool is_stack = false;
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MBlock *b = 0;
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Allocator *a = allocator();
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if (a->PointerIsMine((void *)addr)) {
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void *block_begin = a->GetBlockBegin((void *)addr);
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if (block_begin) b = ctx->metamap.GetBlock((uptr)block_begin);
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}
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if (b != 0) {
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region_address = (uptr)allocator()->GetBlockBegin((void *)addr);
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region_size = b->siz;
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region_kind = "heap";
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} else {
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// TODO(kuba.brecka): We should not lock. This is supposed to be called
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// from within the debugger when other threads are stopped.
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ctx->thread_registry->Lock();
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ThreadContext *tctx = IsThreadStackOrTls(addr, &is_stack);
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ctx->thread_registry->Unlock();
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if (tctx) {
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region_kind = is_stack ? "stack" : "tls";
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} else {
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region_kind = "global";
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DataInfo info;
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if (Symbolizer::GetOrInit()->SymbolizeData(addr, &info)) {
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internal_strncpy(name, info.name, name_size);
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region_address = info.start;
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region_size = info.size;
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}
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}
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}
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}
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CHECK(region_kind);
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if (region_address_ptr) *region_address_ptr = region_address;
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if (region_size_ptr) *region_size_ptr = region_size;
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return region_kind;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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int __tsan_get_alloc_stack(uptr addr, uptr *trace, uptr size, int *thread_id,
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tid_t *os_id) {
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MBlock *b = 0;
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Allocator *a = allocator();
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if (a->PointerIsMine((void *)addr)) {
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void *block_begin = a->GetBlockBegin((void *)addr);
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if (block_begin) b = ctx->metamap.GetBlock((uptr)block_begin);
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}
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if (b == 0) return 0;
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*thread_id = b->tid;
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// No locking. This is supposed to be called from within the debugger when
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// other threads are stopped.
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ThreadContextBase *tctx = ctx->thread_registry->GetThreadLocked(b->tid);
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*os_id = tctx->os_id;
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StackTrace stack = StackDepotGet(b->stk);
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size = Min(size, (uptr)stack.size);
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for (uptr i = 0; i < size; i++) trace[i] = stack.trace[stack.size - i - 1];
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return size;
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}
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