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//===-- tsan_debugging.cpp ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
// TSan debugging API implementation.
//===----------------------------------------------------------------------===//
#include "tsan_interface.h"
#include "tsan_report.h"
#include "tsan_rtl.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
using namespace __tsan;
static const char *ReportTypeDescription(ReportType typ) {
switch (typ) {
case ReportTypeRace: return "data-race";
case ReportTypeVptrRace: return "data-race-vptr";
case ReportTypeUseAfterFree: return "heap-use-after-free";
case ReportTypeVptrUseAfterFree: return "heap-use-after-free-vptr";
case ReportTypeExternalRace: return "external-race";
case ReportTypeThreadLeak: return "thread-leak";
case ReportTypeMutexDestroyLocked: return "locked-mutex-destroy";
case ReportTypeMutexDoubleLock: return "mutex-double-lock";
case ReportTypeMutexInvalidAccess: return "mutex-invalid-access";
case ReportTypeMutexBadUnlock: return "mutex-bad-unlock";
case ReportTypeMutexBadReadLock: return "mutex-bad-read-lock";
case ReportTypeMutexBadReadUnlock: return "mutex-bad-read-unlock";
case ReportTypeSignalUnsafe: return "signal-unsafe-call";
case ReportTypeErrnoInSignal: return "errno-in-signal-handler";
case ReportTypeDeadlock: return "lock-order-inversion";
// No default case so compiler warns us if we miss one
}
UNREACHABLE("missing case");
}
static const char *ReportLocationTypeDescription(ReportLocationType typ) {
switch (typ) {
case ReportLocationGlobal: return "global";
case ReportLocationHeap: return "heap";
case ReportLocationStack: return "stack";
case ReportLocationTLS: return "tls";
case ReportLocationFD: return "fd";
// No default case so compiler warns us if we miss one
}
UNREACHABLE("missing case");
}
static void CopyTrace(SymbolizedStack *first_frame, void **trace,
uptr trace_size) {
uptr i = 0;
for (SymbolizedStack *frame = first_frame; frame != nullptr;
frame = frame->next) {
trace[i++] = (void *)frame->info.address;
if (i >= trace_size) break;
}
}
// Meant to be called by the debugger.
SANITIZER_INTERFACE_ATTRIBUTE
void *__tsan_get_current_report() {
return const_cast<ReportDesc*>(cur_thread()->current_report);
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_data(void *report, const char **description, int *count,
int *stack_count, int *mop_count, int *loc_count,
int *mutex_count, int *thread_count,
int *unique_tid_count, void **sleep_trace,
uptr trace_size) {
const ReportDesc *rep = (ReportDesc *)report;
*description = ReportTypeDescription(rep->typ);
*count = rep->count;
*stack_count = rep->stacks.Size();
*mop_count = rep->mops.Size();
*loc_count = rep->locs.Size();
*mutex_count = rep->mutexes.Size();
*thread_count = rep->threads.Size();
*unique_tid_count = rep->unique_tids.Size();
if (rep->sleep) CopyTrace(rep->sleep->frames, sleep_trace, trace_size);
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_tag(void *report, uptr *tag) {
const ReportDesc *rep = (ReportDesc *)report;
*tag = rep->tag;
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_stack(void *report, uptr idx, void **trace,
uptr trace_size) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->stacks.Size());
ReportStack *stack = rep->stacks[idx];
if (stack) CopyTrace(stack->frames, trace, trace_size);
return stack ? 1 : 0;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_mop(void *report, uptr idx, int *tid, void **addr,
int *size, int *write, int *atomic, void **trace,
uptr trace_size) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->mops.Size());
ReportMop *mop = rep->mops[idx];
*tid = mop->tid;
*addr = (void *)mop->addr;
*size = mop->size;
*write = mop->write ? 1 : 0;
*atomic = mop->atomic ? 1 : 0;
if (mop->stack) CopyTrace(mop->stack->frames, trace, trace_size);
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_loc(void *report, uptr idx, const char **type,
void **addr, uptr *start, uptr *size, int *tid,
int *fd, int *suppressable, void **trace,
uptr trace_size) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->locs.Size());
ReportLocation *loc = rep->locs[idx];
*type = ReportLocationTypeDescription(loc->type);
*addr = (void *)loc->global.start;
*start = loc->heap_chunk_start;
*size = loc->heap_chunk_size;
*tid = loc->tid;
*fd = loc->fd;
*suppressable = loc->suppressable;
if (loc->stack) CopyTrace(loc->stack->frames, trace, trace_size);
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_loc_object_type(void *report, uptr idx,
const char **object_type) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->locs.Size());
ReportLocation *loc = rep->locs[idx];
*object_type = GetObjectTypeFromTag(loc->external_tag);
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_mutex(void *report, uptr idx, uptr *mutex_id, void **addr,
int *destroyed, void **trace, uptr trace_size) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->mutexes.Size());
ReportMutex *mutex = rep->mutexes[idx];
*mutex_id = mutex->id;
*addr = (void *)mutex->addr;
*destroyed = false;
if (mutex->stack) CopyTrace(mutex->stack->frames, trace, trace_size);
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_thread(void *report, uptr idx, int *tid, tid_t *os_id,
int *running, const char **name, int *parent_tid,
void **trace, uptr trace_size) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->threads.Size());
ReportThread *thread = rep->threads[idx];
*tid = thread->id;
*os_id = thread->os_id;
*running = thread->running;
*name = thread->name;
*parent_tid = thread->parent_tid;
if (thread->stack) CopyTrace(thread->stack->frames, trace, trace_size);
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_report_unique_tid(void *report, uptr idx, int *tid) {
const ReportDesc *rep = (ReportDesc *)report;
CHECK_LT(idx, rep->unique_tids.Size());
*tid = rep->unique_tids[idx];
return 1;
}
SANITIZER_INTERFACE_ATTRIBUTE
const char *__tsan_locate_address(uptr addr, char *name, uptr name_size,
uptr *region_address_ptr,
uptr *region_size_ptr) {
uptr region_address = 0;
uptr region_size = 0;
const char *region_kind = nullptr;
if (name && name_size > 0) name[0] = 0;
if (IsMetaMem(reinterpret_cast<u32 *>(addr))) {
region_kind = "meta shadow";
} else if (IsShadowMem(reinterpret_cast<RawShadow *>(addr))) {
region_kind = "shadow";
} else {
bool is_stack = false;
MBlock *b = 0;
Allocator *a = allocator();
if (a->PointerIsMine((void *)addr)) {
void *block_begin = a->GetBlockBegin((void *)addr);
if (block_begin) b = ctx->metamap.GetBlock((uptr)block_begin);
}
if (b != 0) {
region_address = (uptr)allocator()->GetBlockBegin((void *)addr);
region_size = b->siz;
region_kind = "heap";
} else {
// TODO(kuba.brecka): We should not lock. This is supposed to be called
// from within the debugger when other threads are stopped.
ctx->thread_registry.Lock();
ThreadContext *tctx = IsThreadStackOrTls(addr, &is_stack);
ctx->thread_registry.Unlock();
if (tctx) {
region_kind = is_stack ? "stack" : "tls";
} else {
region_kind = "global";
DataInfo info;
if (Symbolizer::GetOrInit()->SymbolizeData(addr, &info)) {
internal_strncpy(name, info.name, name_size);
region_address = info.start;
region_size = info.size;
}
}
}
}
CHECK(region_kind);
if (region_address_ptr) *region_address_ptr = region_address;
if (region_size_ptr) *region_size_ptr = region_size;
return region_kind;
}
SANITIZER_INTERFACE_ATTRIBUTE
int __tsan_get_alloc_stack(uptr addr, uptr *trace, uptr size, int *thread_id,
tid_t *os_id) {
MBlock *b = 0;
Allocator *a = allocator();
if (a->PointerIsMine((void *)addr)) {
void *block_begin = a->GetBlockBegin((void *)addr);
if (block_begin) b = ctx->metamap.GetBlock((uptr)block_begin);
}
if (b == 0) return 0;
*thread_id = b->tid;
// No locking. This is supposed to be called from within the debugger when
// other threads are stopped.
ThreadContextBase *tctx = ctx->thread_registry.GetThreadLocked(b->tid);
*os_id = tctx->os_id;
StackTrace stack = StackDepotGet(b->stk);
size = Min(size, (uptr)stack.size);
for (uptr i = 0; i < size; i++) trace[i] = stack.trace[stack.size - i - 1];
return size;
}
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