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//===-- tsan_report.cc ----------------------------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "tsan_report.h"
#include "tsan_platform.h"
#include "tsan_rtl.h"
namespace __tsan {
ReportDesc::ReportDesc()
: stacks(MBlockReportStack)
, mops(MBlockReportMop)
, locs(MBlockReportLoc)
, mutexes(MBlockReportMutex)
, threads(MBlockReportThread)
, sleep() {
}
ReportMop::ReportMop()
: mset(MBlockReportMutex) {
}
ReportDesc::~ReportDesc() {
// FIXME(dvyukov): it must be leaking a lot of memory.
}
#ifndef TSAN_GO
const int kThreadBufSize = 32;
const char *thread_name(char *buf, int tid) {
if (tid == 0)
return "main thread";
internal_snprintf(buf, kThreadBufSize, "thread T%d", tid);
return buf;
}
static const char *ReportTypeString(ReportType typ) {
if (typ == ReportTypeRace)
return "data race";
if (typ == ReportTypeUseAfterFree)
return "heap-use-after-free";
if (typ == ReportTypeThreadLeak)
return "thread leak";
if (typ == ReportTypeMutexDestroyLocked)
return "destroy of a locked mutex";
if (typ == ReportTypeSignalUnsafe)
return "signal-unsafe call inside of a signal";
if (typ == ReportTypeErrnoInSignal)
return "signal handler spoils errno";
return "";
}
void PrintStack(const ReportStack *ent) {
if (ent == 0) {
Printf(" [failed to restore the stack]\n\n");
return;
}
for (int i = 0; ent; ent = ent->next, i++) {
Printf(" #%d %s %s:%d", i, ent->func, ent->file, ent->line);
if (ent->col)
Printf(":%d", ent->col);
if (ent->module && ent->offset)
Printf(" (%s+%p)\n", ent->module, (void*)ent->offset);
else
Printf(" (%p)\n", (void*)ent->pc);
}
Printf("\n");
}
static void PrintMutexSet(Vector<ReportMopMutex> const& mset) {
for (uptr i = 0; i < mset.Size(); i++) {
if (i == 0)
Printf(" (mutexes:");
const ReportMopMutex m = mset[i];
Printf(" %s M%llu", m.write ? "write" : "read", m.id);
Printf(i == mset.Size() - 1 ? ")" : ",");
}
}
static const char *MopDesc(bool first, bool write, bool atomic) {
return atomic ? (first ? (write ? "Atomic write" : "Atomic read")
: (write ? "Previous atomic write" : "Previous atomic read"))
: (first ? (write ? "Write" : "Read")
: (write ? "Previous write" : "Previous read"));
}
static void PrintMop(const ReportMop *mop, bool first) {
char thrbuf[kThreadBufSize];
Printf(" %s of size %d at %p by %s",
MopDesc(first, mop->write, mop->atomic),
mop->size, (void*)mop->addr,
thread_name(thrbuf, mop->tid));
PrintMutexSet(mop->mset);
Printf(":\n");
PrintStack(mop->stack);
}
static void PrintLocation(const ReportLocation *loc) {
char thrbuf[kThreadBufSize];
if (loc->type == ReportLocationGlobal) {
Printf(" Location is global '%s' of size %zu at %zx (%s+%p)\n\n",
loc->name, loc->size, loc->addr, loc->module, loc->offset);
} else if (loc->type == ReportLocationHeap) {
char thrbuf[kThreadBufSize];
Printf(" Location is heap block of size %zu at %p allocated by %s:\n",
loc->size, loc->addr, thread_name(thrbuf, loc->tid));
PrintStack(loc->stack);
} else if (loc->type == ReportLocationStack) {
Printf(" Location is stack of %s.\n\n", thread_name(thrbuf, loc->tid));
} else if (loc->type == ReportLocationTLS) {
Printf(" Location is TLS of %s.\n\n", thread_name(thrbuf, loc->tid));
} else if (loc->type == ReportLocationFD) {
Printf(" Location is file descriptor %d created by %s at:\n",
loc->fd, thread_name(thrbuf, loc->tid));
PrintStack(loc->stack);
}
}
static void PrintMutex(const ReportMutex *rm) {
if (rm->destroyed) {
Printf(" Mutex M%llu is already destroyed.\n\n", rm->id);
} else {
Printf(" Mutex M%llu created at:\n", rm->id);
PrintStack(rm->stack);
}
}
static void PrintThread(const ReportThread *rt) {
if (rt->id == 0) // Little sense in describing the main thread.
return;
Printf(" Thread T%d", rt->id);
if (rt->name)
Printf(" '%s'", rt->name);
char thrbuf[kThreadBufSize];
Printf(" (tid=%zu, %s) created by %s",
rt->pid, rt->running ? "running" : "finished",
thread_name(thrbuf, rt->parent_tid));
if (rt->stack)
Printf(" at:");
Printf("\n");
PrintStack(rt->stack);
}
static void PrintSleep(const ReportStack *s) {
Printf(" As if synchronized via sleep:\n");
PrintStack(s);
}
static ReportStack *ChooseSummaryStack(const ReportDesc *rep) {
if (rep->mops.Size())
return rep->mops[0]->stack;
if (rep->stacks.Size())
return rep->stacks[0];
if (rep->mutexes.Size())
return rep->mutexes[0]->stack;
if (rep->threads.Size())
return rep->threads[0]->stack;
return 0;
}
ReportStack *SkipTsanInternalFrames(ReportStack *ent) {
while (FrameIsInternal(ent) && ent->next)
ent = ent->next;
return ent;
}
void PrintReport(const ReportDesc *rep) {
Printf("==================\n");
const char *rep_typ_str = ReportTypeString(rep->typ);
Printf("WARNING: ThreadSanitizer: %s (pid=%d)\n", rep_typ_str, GetPid());
for (uptr i = 0; i < rep->stacks.Size(); i++) {
if (i)
Printf(" and:\n");
PrintStack(rep->stacks[i]);
}
for (uptr i = 0; i < rep->mops.Size(); i++)
PrintMop(rep->mops[i], i == 0);
if (rep->sleep)
PrintSleep(rep->sleep);
for (uptr i = 0; i < rep->locs.Size(); i++)
PrintLocation(rep->locs[i]);
for (uptr i = 0; i < rep->mutexes.Size(); i++)
PrintMutex(rep->mutexes[i]);
for (uptr i = 0; i < rep->threads.Size(); i++)
PrintThread(rep->threads[i]);
if (ReportStack *ent = SkipTsanInternalFrames(ChooseSummaryStack(rep)))
ReportErrorSummary(rep_typ_str, ent->file, ent->line, ent->func);
Printf("==================\n");
}
#else
void PrintStack(const ReportStack *ent) {
if (ent == 0) {
Printf(" [failed to restore the stack]\n\n");
return;
}
for (int i = 0; ent; ent = ent->next, i++) {
Printf(" %s()\n %s:%d +0x%zx\n",
ent->func, ent->file, ent->line, (void*)ent->offset);
}
Printf("\n");
}
static void PrintMop(const ReportMop *mop, bool first) {
Printf("%s by goroutine %d:\n",
(first ? (mop->write ? "Write" : "Read")
: (mop->write ? "Previous write" : "Previous read")),
mop->tid);
PrintStack(mop->stack);
}
static void PrintThread(const ReportThread *rt) {
if (rt->id == 0) // Little sense in describing the main thread.
return;
Printf("Goroutine %d (%s) created at:\n",
rt->id, rt->running ? "running" : "finished");
PrintStack(rt->stack);
}
void PrintReport(const ReportDesc *rep) {
Printf("==================\n");
Printf("WARNING: DATA RACE\n");
for (uptr i = 0; i < rep->mops.Size(); i++)
PrintMop(rep->mops[i], i == 0);
for (uptr i = 0; i < rep->threads.Size(); i++)
PrintThread(rep->threads[i]);
Printf("==================\n");
}
#endif
} // namespace __tsan
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