1 //===-- sanitizer_coverage.cc ---------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Sanitizer Coverage.
11 // This file implements run-time support for a poor man's coverage tool.
13 // Compiler instrumentation:
14 // For every interesting basic block the compiler injects the following code:
16 // __sanitizer_cov(&Guard);
18 // At the module start up time __sanitizer_cov_module_init sets the guards
19 // to consecutive negative numbers (-1, -2, -3, ...).
20 // It's fine to call __sanitizer_cov more than once for a given block.
23 // - __sanitizer_cov(): record that we've executed the PC (GET_CALLER_PC).
24 // and atomically set Guard to -Guard.
25 // - __sanitizer_cov_dump: dump the coverage data to disk.
26 // For every module of the current process that has coverage data
27 // this will create a file module_name.PID.sancov.
29 // The file format is simple: the first 8 bytes is the magic,
30 // one of 0xC0BFFFFFFFFFFF64 and 0xC0BFFFFFFFFFFF32. The last byte of the
31 // magic defines the size of the following offsets.
32 // The rest of the data is the offsets in the module.
34 // Eventually, this coverage implementation should be obsoleted by a more
35 // powerful general purpose Clang/LLVM coverage instrumentation.
36 // Consider this implementation as prototype.
38 // FIXME: support (or at least test with) dlclose.
39 //===----------------------------------------------------------------------===//
41 #include "sanitizer_allocator_internal.h"
42 #include "sanitizer_common.h"
43 #include "sanitizer_libc.h"
44 #include "sanitizer_mutex.h"
45 #include "sanitizer_procmaps.h"
46 #include "sanitizer_stacktrace.h"
47 #include "sanitizer_symbolizer.h"
48 #include "sanitizer_flags.h"
50 using namespace __sanitizer;
52 static const u64 kMagic64 = 0xC0BFFFFFFFFFFF64ULL;
53 static const u64 kMagic32 = 0xC0BFFFFFFFFFFF32ULL;
54 static const uptr kNumWordsForMagic = SANITIZER_WORDSIZE == 64 ? 1 : 2;
55 static const u64 kMagic = SANITIZER_WORDSIZE == 64 ? kMagic64 : kMagic32;
57 static atomic_uint32_t dump_once_guard; // Ensure that CovDump runs only once.
59 static atomic_uintptr_t coverage_counter;
61 // pc_array is the array containing the covered PCs.
62 // To make the pc_array thread- and async-signal-safe it has to be large enough.
63 // 128M counters "ought to be enough for anybody" (4M on 32-bit).
65 // With coverage_direct=1 in ASAN_OPTIONS, pc_array memory is mapped to a file.
66 // In this mode, __sanitizer_cov_dump does nothing, and CovUpdateMapping()
67 // dump current memory layout to another file.
69 static bool cov_sandboxed = false;
70 static fd_t cov_fd = kInvalidFd;
71 static unsigned int cov_max_block_size = 0;
72 static bool coverage_enabled = false;
73 static const char *coverage_dir;
75 namespace __sanitizer {
84 void AfterFork(int child_pid);
85 void Extend(uptr npcs);
86 void Add(uptr pc, u32 *guard);
91 void InitializeGuardArray(s32 *guards);
92 void InitializeGuards(s32 *guards, uptr n, const char *module_name,
94 void ReinitializeGuards();
100 struct NamedPcRange {
101 const char *copied_module_name;
102 uptr beg, end; // elements [beg,end) in pc_array.
106 void UpdateModuleNameVec(uptr caller_pc, uptr range_beg, uptr range_end);
107 void GetRangeOffsets(const NamedPcRange& r, Symbolizer* s,
108 InternalMmapVector<uptr>* offsets) const;
110 // Maximal size pc array may ever grow.
111 // We MmapNoReserve this space to ensure that the array is contiguous.
112 static const uptr kPcArrayMaxSize =
113 FIRST_32_SECOND_64(1 << (SANITIZER_ANDROID ? 24 : 26), 1 << 27);
114 // The amount file mapping for the pc array is grown by.
115 static const uptr kPcArrayMmapSize = 64 * 1024;
117 // pc_array is allocated with MmapNoReserveOrDie and so it uses only as
118 // much RAM as it really needs.
120 // Index of the first available pc_array slot.
121 atomic_uintptr_t pc_array_index;
123 atomic_uintptr_t pc_array_size;
124 // Current file mapped size of the pc array.
125 uptr pc_array_mapped_size;
126 // Descriptor of the file mapped pc array.
129 // Vector of coverage guard arrays, protected by mu.
130 InternalMmapVectorNoCtor<s32*> guard_array_vec;
132 // Vector of module and compilation unit pc ranges.
133 InternalMmapVectorNoCtor<NamedPcRange> comp_unit_name_vec;
134 InternalMmapVectorNoCtor<NamedPcRange> module_name_vec;
139 static CoverageData coverage_data;
141 void CovUpdateMapping(const char *path, uptr caller_pc = 0);
143 void CoverageData::DirectOpen() {
144 InternalScopedString path(kMaxPathLength);
145 internal_snprintf((char *)path.data(), path.size(), "%s/%zd.sancov.raw",
146 coverage_dir, internal_getpid());
147 pc_fd = OpenFile(path.data(), RdWr);
148 if (pc_fd == kInvalidFd) {
149 Report("Coverage: failed to open %s for reading/writing\n", path.data());
153 pc_array_mapped_size = 0;
154 CovUpdateMapping(coverage_dir);
157 void CoverageData::Init() {
161 void CoverageData::Enable() {
164 pc_array = reinterpret_cast<uptr *>(
165 MmapNoReserveOrDie(sizeof(uptr) * kPcArrayMaxSize, "CovInit"));
166 atomic_store(&pc_array_index, 0, memory_order_relaxed);
167 if (common_flags()->coverage_direct) {
168 atomic_store(&pc_array_size, 0, memory_order_relaxed);
170 atomic_store(&pc_array_size, kPcArrayMaxSize, memory_order_relaxed);
174 void CoverageData::InitializeGuardArray(s32 *guards) {
175 Enable(); // Make sure coverage is enabled at this point.
177 for (s32 j = 1; j <= n; j++) {
178 uptr idx = atomic_load_relaxed(&pc_array_index);
179 atomic_store_relaxed(&pc_array_index, idx + 1);
180 guards[j] = -static_cast<s32>(idx + 1);
184 void CoverageData::Disable() {
186 UnmapOrDie(pc_array, sizeof(uptr) * kPcArrayMaxSize);
189 if (pc_fd != kInvalidFd) {
195 void CoverageData::ReinitializeGuards() {
196 // Assuming single thread.
197 atomic_store(&pc_array_index, 0, memory_order_relaxed);
198 for (uptr i = 0; i < guard_array_vec.size(); i++)
199 InitializeGuardArray(guard_array_vec[i]);
202 void CoverageData::ReInit() {
204 if (coverage_enabled) {
205 if (common_flags()->coverage_direct) {
206 // In memory-mapped mode we must extend the new file to the known array
208 uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
209 uptr npcs = size / sizeof(uptr);
211 if (size) Extend(npcs);
212 if (coverage_enabled) CovUpdateMapping(coverage_dir);
217 // Re-initialize the guards.
218 // We are single-threaded now, no need to grab any lock.
219 CHECK_EQ(atomic_load(&pc_array_index, memory_order_relaxed), 0);
220 ReinitializeGuards();
223 void CoverageData::BeforeFork() {
227 void CoverageData::AfterFork(int child_pid) {
228 // We are single-threaded so it's OK to release the lock early.
230 if (child_pid == 0) ReInit();
233 // Extend coverage PC array to fit additional npcs elements.
234 void CoverageData::Extend(uptr npcs) {
235 if (!common_flags()->coverage_direct) return;
236 SpinMutexLock l(&mu);
238 uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
239 size += npcs * sizeof(uptr);
241 if (coverage_enabled && size > pc_array_mapped_size) {
242 if (pc_fd == kInvalidFd) DirectOpen();
243 CHECK_NE(pc_fd, kInvalidFd);
245 uptr new_mapped_size = pc_array_mapped_size;
246 while (size > new_mapped_size) new_mapped_size += kPcArrayMmapSize;
247 CHECK_LE(new_mapped_size, sizeof(uptr) * kPcArrayMaxSize);
249 // Extend the file and map the new space at the end of pc_array.
250 uptr res = internal_ftruncate(pc_fd, new_mapped_size);
252 if (internal_iserror(res, &err)) {
253 Printf("failed to extend raw coverage file: %d\n", err);
257 uptr next_map_base = ((uptr)pc_array) + pc_array_mapped_size;
258 void *p = MapWritableFileToMemory((void *)next_map_base,
259 new_mapped_size - pc_array_mapped_size,
260 pc_fd, pc_array_mapped_size);
261 CHECK_EQ((uptr)p, next_map_base);
262 pc_array_mapped_size = new_mapped_size;
265 atomic_store(&pc_array_size, size, memory_order_release);
268 void CoverageData::UpdateModuleNameVec(uptr caller_pc, uptr range_beg,
270 auto sym = Symbolizer::GetOrInit();
273 const char *module_name = sym->GetModuleNameForPc(caller_pc);
274 if (!module_name) return;
275 if (module_name_vec.empty() ||
276 module_name_vec.back().copied_module_name != module_name)
277 module_name_vec.push_back({module_name, range_beg, range_end});
279 module_name_vec.back().end = range_end;
282 void CoverageData::InitializeGuards(s32 *guards, uptr n,
283 const char *comp_unit_name,
285 // The array 'guards' has n+1 elements, we use the element zero
287 CHECK_LT(n, 1 << 30);
288 guards[0] = static_cast<s32>(n);
289 InitializeGuardArray(guards);
290 SpinMutexLock l(&mu);
291 uptr range_end = atomic_load(&pc_array_index, memory_order_relaxed);
292 uptr range_beg = range_end - n;
293 comp_unit_name_vec.push_back({comp_unit_name, range_beg, range_end});
294 guard_array_vec.push_back(guards);
295 UpdateModuleNameVec(caller_pc, range_beg, range_end);
298 static const uptr kBundleCounterBits = 16;
300 // When coverage_order_pcs==true and SANITIZER_WORDSIZE==64
301 // we insert the global counter into the first 16 bits of the PC.
302 uptr BundlePcAndCounter(uptr pc, uptr counter) {
303 if (SANITIZER_WORDSIZE != 64 || !common_flags()->coverage_order_pcs)
305 static const uptr kMaxCounter = (1 << kBundleCounterBits) - 1;
306 if (counter > kMaxCounter)
307 counter = kMaxCounter;
308 CHECK_EQ(0, pc >> (SANITIZER_WORDSIZE - kBundleCounterBits));
309 return pc | (counter << (SANITIZER_WORDSIZE - kBundleCounterBits));
312 uptr UnbundlePc(uptr bundle) {
313 if (SANITIZER_WORDSIZE != 64 || !common_flags()->coverage_order_pcs)
315 return (bundle << kBundleCounterBits) >> kBundleCounterBits;
318 uptr UnbundleCounter(uptr bundle) {
319 if (SANITIZER_WORDSIZE != 64 || !common_flags()->coverage_order_pcs)
321 return bundle >> (SANITIZER_WORDSIZE - kBundleCounterBits);
324 // If guard is negative, atomically set it to -guard and store the PC in
326 void CoverageData::Add(uptr pc, u32 *guard) {
327 atomic_uint32_t *atomic_guard = reinterpret_cast<atomic_uint32_t*>(guard);
328 s32 guard_value = atomic_load(atomic_guard, memory_order_relaxed);
329 if (guard_value >= 0) return;
331 atomic_store(atomic_guard, -guard_value, memory_order_relaxed);
332 if (!pc_array) return;
334 uptr idx = -guard_value - 1;
335 if (idx >= atomic_load(&pc_array_index, memory_order_acquire))
336 return; // May happen after fork when pc_array_index becomes 0.
337 CHECK_LT(idx, atomic_load(&pc_array_size, memory_order_acquire));
338 uptr counter = atomic_fetch_add(&coverage_counter, 1, memory_order_relaxed);
339 pc_array[idx] = BundlePcAndCounter(pc, counter);
342 uptr *CoverageData::data() {
346 uptr CoverageData::size() const {
347 return atomic_load(&pc_array_index, memory_order_relaxed);
350 // Block layout for packed file format: header, followed by module name (no
351 // trailing zero), followed by data blob.
354 unsigned int module_name_length;
355 unsigned int data_length;
358 static void CovWritePacked(int pid, const char *module, const void *blob,
359 unsigned int blob_size) {
360 if (cov_fd == kInvalidFd) return;
361 unsigned module_name_length = internal_strlen(module);
362 CovHeader header = {pid, module_name_length, blob_size};
364 if (cov_max_block_size == 0) {
365 // Writing to a file. Just go ahead.
366 WriteToFile(cov_fd, &header, sizeof(header));
367 WriteToFile(cov_fd, module, module_name_length);
368 WriteToFile(cov_fd, blob, blob_size);
370 // Writing to a socket. We want to split the data into appropriately sized
372 InternalScopedBuffer<char> block(cov_max_block_size);
373 CHECK_EQ((uptr)block.data(), (uptr)(CovHeader *)block.data());
374 uptr header_size_with_module = sizeof(header) + module_name_length;
375 CHECK_LT(header_size_with_module, cov_max_block_size);
376 unsigned int max_payload_size =
377 cov_max_block_size - header_size_with_module;
378 char *block_pos = block.data();
379 internal_memcpy(block_pos, &header, sizeof(header));
380 block_pos += sizeof(header);
381 internal_memcpy(block_pos, module, module_name_length);
382 block_pos += module_name_length;
383 char *block_data_begin = block_pos;
384 const char *blob_pos = (const char *)blob;
385 while (blob_size > 0) {
386 unsigned int payload_size = Min(blob_size, max_payload_size);
387 blob_size -= payload_size;
388 internal_memcpy(block_data_begin, blob_pos, payload_size);
389 blob_pos += payload_size;
390 ((CovHeader *)block.data())->data_length = payload_size;
391 WriteToFile(cov_fd, block.data(), header_size_with_module + payload_size);
396 // If packed = false: <name>.<pid>.<sancov> (name = module name).
397 // If packed = true and name == 0: <pid>.<sancov>.<packed>.
398 // If packed = true and name != 0: <name>.<sancov>.<packed> (name is
400 static fd_t CovOpenFile(InternalScopedString *path, bool packed,
401 const char *name, const char *extension = "sancov") {
405 path->append("%s/%s.%zd.%s", coverage_dir, name, internal_getpid(),
409 path->append("%s/%zd.%s.packed", coverage_dir, internal_getpid(),
412 path->append("%s/%s.%s.packed", coverage_dir, name, extension);
415 fd_t fd = OpenFile(path->data(), WrOnly, &err);
416 if (fd == kInvalidFd)
417 Report("SanitizerCoverage: failed to open %s for writing (reason: %d)\n",
422 void CoverageData::DumpAsBitSet() {
423 if (!common_flags()->coverage_bitset) return;
425 InternalScopedBuffer<char> out(size());
426 InternalScopedString path(kMaxPathLength);
427 for (uptr m = 0; m < module_name_vec.size(); m++) {
429 auto r = module_name_vec[m];
430 CHECK(r.copied_module_name);
431 CHECK_LE(r.beg, r.end);
432 CHECK_LE(r.end, size());
433 for (uptr i = r.beg; i < r.end; i++) {
434 uptr pc = UnbundlePc(pc_array[i]);
435 out[i] = pc ? '1' : '0';
439 const char *base_name = StripModuleName(r.copied_module_name);
440 fd_t fd = CovOpenFile(&path, /* packed */false, base_name, "bitset-sancov");
441 if (fd == kInvalidFd) return;
442 WriteToFile(fd, out.data() + r.beg, r.end - r.beg);
445 " CovDump: bitset of %zd bits written for '%s', %zd bits are set\n",
446 r.end - r.beg, base_name, n_set_bits);
451 void CoverageData::GetRangeOffsets(const NamedPcRange& r, Symbolizer* sym,
452 InternalMmapVector<uptr>* offsets) const {
454 for (uptr i = 0; i < kNumWordsForMagic; i++)
455 offsets->push_back(0);
456 CHECK(r.copied_module_name);
457 CHECK_LE(r.beg, r.end);
458 CHECK_LE(r.end, size());
459 for (uptr i = r.beg; i < r.end; i++) {
460 uptr pc = UnbundlePc(pc_array[i]);
461 uptr counter = UnbundleCounter(pc_array[i]);
462 if (!pc) continue; // Not visited.
464 sym->GetModuleNameAndOffsetForPC(pc, nullptr, &offset);
465 offsets->push_back(BundlePcAndCounter(offset, counter));
468 CHECK_GE(offsets->size(), kNumWordsForMagic);
469 SortArray(offsets->data(), offsets->size());
470 for (uptr i = 0; i < offsets->size(); i++)
471 (*offsets)[i] = UnbundlePc((*offsets)[i]);
474 static void GenerateHtmlReport(const InternalMmapVector<char *> &cov_files) {
475 if (!common_flags()->html_cov_report) {
478 char *sancov_path = FindPathToBinary(common_flags()->sancov_path);
479 if (sancov_path == nullptr) {
483 InternalMmapVector<char *> sancov_argv(cov_files.size() * 2 + 3);
484 sancov_argv.push_back(sancov_path);
485 sancov_argv.push_back(internal_strdup("-html-report"));
486 auto argv_deleter = at_scope_exit([&] {
487 for (uptr i = 0; i < sancov_argv.size(); ++i) {
488 InternalFree(sancov_argv[i]);
492 for (const auto &cov_file : cov_files) {
493 sancov_argv.push_back(internal_strdup(cov_file));
497 ListOfModules modules;
499 for (const LoadedModule &module : modules) {
500 sancov_argv.push_back(internal_strdup(module.full_name()));
504 InternalScopedString report_path(kMaxPathLength);
506 CovOpenFile(&report_path, false /* packed */, GetProcessName(), "html");
507 int pid = StartSubprocess(sancov_argv[0], sancov_argv.data(),
508 kInvalidFd /* stdin */, report_fd /* std_out */);
510 int result = WaitForProcess(pid);
512 Printf("coverage report generated to %s\n", report_path.data());
516 void CoverageData::DumpOffsets() {
517 auto sym = Symbolizer::GetOrInit();
518 if (!common_flags()->coverage_pcs) return;
519 CHECK_NE(sym, nullptr);
520 InternalMmapVector<uptr> offsets(0);
521 InternalScopedString path(kMaxPathLength);
523 InternalMmapVector<char *> cov_files(module_name_vec.size());
524 auto cov_files_deleter = at_scope_exit([&] {
525 for (uptr i = 0; i < cov_files.size(); ++i) {
526 InternalFree(cov_files[i]);
530 for (uptr m = 0; m < module_name_vec.size(); m++) {
531 auto r = module_name_vec[m];
532 GetRangeOffsets(r, sym, &offsets);
534 uptr num_offsets = offsets.size() - kNumWordsForMagic;
535 u64 *magic_p = reinterpret_cast<u64*>(offsets.data());
536 CHECK_EQ(*magic_p, 0ULL);
537 // FIXME: we may want to write 32-bit offsets even in 64-mode
538 // if all the offsets are small enough.
541 const char *module_name = StripModuleName(r.copied_module_name);
543 if (cov_fd != kInvalidFd) {
544 CovWritePacked(internal_getpid(), module_name, offsets.data(),
545 offsets.size() * sizeof(offsets[0]));
546 VReport(1, " CovDump: %zd PCs written to packed file\n", num_offsets);
549 // One file per module per process.
550 fd_t fd = CovOpenFile(&path, false /* packed */, module_name);
551 if (fd == kInvalidFd) continue;
552 WriteToFile(fd, offsets.data(), offsets.size() * sizeof(offsets[0]));
554 cov_files.push_back(internal_strdup(path.data()));
555 VReport(1, " CovDump: %s: %zd PCs written\n", path.data(), num_offsets);
558 if (cov_fd != kInvalidFd)
561 GenerateHtmlReport(cov_files);
564 void CoverageData::DumpAll() {
565 if (!coverage_enabled || common_flags()->coverage_direct) return;
566 if (atomic_fetch_add(&dump_once_guard, 1, memory_order_relaxed))
572 void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
574 if (!coverage_enabled) return;
575 cov_sandboxed = args->coverage_sandboxed;
576 if (!cov_sandboxed) return;
577 cov_max_block_size = args->coverage_max_block_size;
578 if (args->coverage_fd >= 0) {
579 cov_fd = (fd_t)args->coverage_fd;
581 InternalScopedString path(kMaxPathLength);
582 // Pre-open the file now. The sandbox won't allow us to do it later.
583 cov_fd = CovOpenFile(&path, true /* packed */, nullptr);
587 fd_t MaybeOpenCovFile(const char *name) {
589 if (!coverage_enabled) return kInvalidFd;
590 InternalScopedString path(kMaxPathLength);
591 return CovOpenFile(&path, true /* packed */, name);
594 void CovBeforeFork() {
595 coverage_data.BeforeFork();
598 void CovAfterFork(int child_pid) {
599 coverage_data.AfterFork(child_pid);
602 static void MaybeDumpCoverage() {
603 if (common_flags()->coverage)
604 __sanitizer_cov_dump();
607 void InitializeCoverage(bool enabled, const char *dir) {
608 if (coverage_enabled)
609 return; // May happen if two sanitizer enable coverage in the same process.
610 coverage_enabled = enabled;
612 coverage_data.Init();
613 if (enabled) coverage_data.Enable();
614 if (!common_flags()->coverage_direct) Atexit(__sanitizer_cov_dump);
615 AddDieCallback(MaybeDumpCoverage);
618 void ReInitializeCoverage(bool enabled, const char *dir) {
619 coverage_enabled = enabled;
621 coverage_data.ReInit();
624 void CoverageUpdateMapping() {
625 if (coverage_enabled)
626 CovUpdateMapping(coverage_dir);
629 } // namespace __sanitizer
632 SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov(u32 *guard) {
633 coverage_data.Add(StackTrace::GetPreviousInstructionPc(GET_CALLER_PC()),
636 SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_with_check(u32 *guard) {
637 atomic_uint32_t *atomic_guard = reinterpret_cast<atomic_uint32_t*>(guard);
638 if (static_cast<s32>(
639 __sanitizer::atomic_load(atomic_guard, memory_order_relaxed)) < 0)
640 coverage_data.Add(StackTrace::GetPreviousInstructionPc(GET_CALLER_PC()),
643 SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_init() {
644 coverage_enabled = true;
645 coverage_dir = common_flags()->coverage_dir;
646 coverage_data.Init();
648 SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump() {
649 coverage_data.DumpAll();
650 __sanitizer_dump_trace_pc_guard_coverage();
652 SANITIZER_INTERFACE_ATTRIBUTE void
653 __sanitizer_cov_module_init(s32 *guards, uptr npcs, u8 *counters,
654 const char *comp_unit_name) {
655 coverage_data.InitializeGuards(guards, npcs, comp_unit_name, GET_CALLER_PC());
656 if (!common_flags()->coverage_direct) return;
657 if (SANITIZER_ANDROID && coverage_enabled) {
658 // dlopen/dlclose interceptors do not work on Android, so we rely on
659 // Extend() calls to update .sancov.map.
660 CovUpdateMapping(coverage_dir, GET_CALLER_PC());
662 coverage_data.Extend(npcs);
664 SANITIZER_INTERFACE_ATTRIBUTE
665 sptr __sanitizer_maybe_open_cov_file(const char *name) {
666 return (sptr)MaybeOpenCovFile(name);
668 SANITIZER_INTERFACE_ATTRIBUTE
669 uptr __sanitizer_get_total_unique_coverage() {
670 return atomic_load(&coverage_counter, memory_order_relaxed);
673 // Default empty implementations (weak). Users should redefine them.
674 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp, void) {}
675 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp1, void) {}
676 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp2, void) {}
677 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp4, void) {}
678 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp8, void) {}
679 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_switch, void) {}
680 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_div4, void) {}
681 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_div8, void) {}
682 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_gep, void) {}
683 SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_indir, void) {}