127 lines
4.3 KiB
C++
127 lines
4.3 KiB
C++
//===-- sanitizer_coverage_mapping.cc -------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Mmap-based implementation of sanitizer coverage.
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//
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// This is part of the implementation of code coverage that does not require
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// __sanitizer_cov_dump() call. Data is stored in 2 files per process.
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//
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// $pid.sancov.map describes process memory layout in the following text-based
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// format:
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// <pointer size in bits> // 1 line, 32 or 64
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// <mapping start> <mapping end> <base address> <dso name> // repeated
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// ...
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// Mapping lines are NOT sorted. This file is updated every time memory layout
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// is changed (i.e. in dlopen() and dlclose() interceptors).
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//
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// $pid.sancov.raw is a binary dump of PC values, sizeof(uptr) each. Again, not
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// sorted. This file is extended by 64Kb at a time and mapped into memory. It
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// contains one or more 0 words at the end, up to the next 64Kb aligned offset.
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//
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// To convert these 2 files to the usual .sancov format, run sancov.py rawunpack
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// $pid.sancov.raw.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_procmaps.h"
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namespace __sanitizer {
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static const uptr kMaxNumberOfModules = 1 << 14;
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static const uptr kMaxTextSize = 64 * 1024;
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struct CachedMapping {
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public:
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bool NeedsUpdate(uptr pc) {
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int new_pid = internal_getpid();
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if (last_pid == new_pid && pc && pc >= last_range_start &&
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pc < last_range_end)
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return false;
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last_pid = new_pid;
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return true;
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}
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void SetModuleRange(uptr start, uptr end) {
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last_range_start = start;
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last_range_end = end;
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}
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private:
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uptr last_range_start, last_range_end;
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int last_pid;
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};
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static CachedMapping cached_mapping;
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static StaticSpinMutex mapping_mu;
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void CovUpdateMapping(uptr caller_pc) {
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if (!common_flags()->coverage || !common_flags()->coverage_direct) return;
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SpinMutexLock l(&mapping_mu);
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if (!cached_mapping.NeedsUpdate(caller_pc))
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return;
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InternalScopedString text(kMaxTextSize);
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InternalScopedBuffer<char> modules_data(kMaxNumberOfModules *
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sizeof(LoadedModule));
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LoadedModule *modules = (LoadedModule *)modules_data.data();
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CHECK(modules);
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int n_modules = GetListOfModules(modules, kMaxNumberOfModules,
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/* filter */ 0);
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text.append("%d\n", sizeof(uptr) * 8);
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for (int i = 0; i < n_modules; ++i) {
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char *module_name = StripModuleName(modules[i].full_name());
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for (unsigned j = 0; j < modules[i].n_ranges(); ++j) {
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if (modules[i].address_range_executable(j)) {
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uptr start = modules[i].address_range_start(j);
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uptr end = modules[i].address_range_end(j);
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uptr base = modules[i].base_address();
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text.append("%zx %zx %zx %s\n", start, end, base, module_name);
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if (caller_pc && caller_pc >= start && caller_pc < end)
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cached_mapping.SetModuleRange(start, end);
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}
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}
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InternalFree(module_name);
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}
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int err;
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InternalScopedString tmp_path(64 +
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internal_strlen(common_flags()->coverage_dir));
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uptr res = internal_snprintf((char *)tmp_path.data(), tmp_path.size(),
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"%s/%zd.sancov.map.tmp", common_flags()->coverage_dir,
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internal_getpid());
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CHECK_LE(res, tmp_path.size());
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uptr map_fd = OpenFile(tmp_path.data(), true);
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if (internal_iserror(map_fd)) {
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Report(" Coverage: failed to open %s for writing\n", tmp_path.data());
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Die();
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}
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res = internal_write(map_fd, text.data(), text.length());
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if (internal_iserror(res, &err)) {
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Printf("sancov.map write failed: %d\n", err);
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Die();
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}
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internal_close(map_fd);
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InternalScopedString path(64 + internal_strlen(common_flags()->coverage_dir));
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res = internal_snprintf((char *)path.data(), path.size(), "%s/%zd.sancov.map",
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common_flags()->coverage_dir, internal_getpid());
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CHECK_LE(res, path.size());
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res = internal_rename(tmp_path.data(), path.data());
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if (internal_iserror(res, &err)) {
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Printf("sancov.map rename failed: %d\n", err);
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Die();
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}
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}
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} // namespace __sanitizer
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