116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
//===-- sanitizer_libignore.h -----------------------------------*- C++ -*-===//
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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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// LibIgnore allows to ignore all interceptors called from a particular set
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// of dynamic libraries. LibIgnore can be initialized with several templates
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// of names of libraries to be ignored. It finds code ranges for the libraries;
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// and checks whether the provided PC value belongs to the code ranges.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_LIBIGNORE_H
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#define SANITIZER_LIBIGNORE_H
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_common.h"
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#include "sanitizer_atomic.h"
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#include "sanitizer_mutex.h"
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namespace __sanitizer {
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class LibIgnore {
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public:
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explicit LibIgnore(LinkerInitialized);
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// Must be called during initialization.
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void AddIgnoredLibrary(const char *name_templ);
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void IgnoreNoninstrumentedModules(bool enable) {
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track_instrumented_libs_ = enable;
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}
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// Must be called after a new dynamic library is loaded.
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void OnLibraryLoaded(const char *name);
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// Must be called after a dynamic library is unloaded.
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void OnLibraryUnloaded();
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// Checks whether the provided PC belongs to one of the ignored libraries or
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// the PC should be ignored because it belongs to an non-instrumented module
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// (when ignore_noninstrumented_modules=1). Also returns true via
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// "pc_in_ignored_lib" if the PC is in an ignored library, false otherwise.
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bool IsIgnored(uptr pc, bool *pc_in_ignored_lib) const;
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// Checks whether the provided PC belongs to an instrumented module.
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bool IsPcInstrumented(uptr pc) const;
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private:
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struct Lib {
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char *templ;
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char *name;
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char *real_name; // target of symlink
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bool loaded;
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};
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struct LibCodeRange {
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uptr begin;
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uptr end;
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};
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inline bool IsInRange(uptr pc, const LibCodeRange &range) const {
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return (pc >= range.begin && pc < range.end);
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}
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static const uptr kMaxIgnoredRanges = 128;
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static const uptr kMaxInstrumentedRanges = 1024;
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static const uptr kMaxLibs = 1024;
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// Hot part:
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atomic_uintptr_t ignored_ranges_count_;
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LibCodeRange ignored_code_ranges_[kMaxIgnoredRanges];
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atomic_uintptr_t instrumented_ranges_count_;
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LibCodeRange instrumented_code_ranges_[kMaxInstrumentedRanges];
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// Cold part:
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BlockingMutex mutex_;
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uptr count_;
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Lib libs_[kMaxLibs];
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bool track_instrumented_libs_;
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// Disallow copying of LibIgnore objects.
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LibIgnore(const LibIgnore&); // not implemented
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void operator = (const LibIgnore&); // not implemented
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};
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inline bool LibIgnore::IsIgnored(uptr pc, bool *pc_in_ignored_lib) const {
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const uptr n = atomic_load(&ignored_ranges_count_, memory_order_acquire);
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for (uptr i = 0; i < n; i++) {
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if (IsInRange(pc, ignored_code_ranges_[i])) {
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*pc_in_ignored_lib = true;
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return true;
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}
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}
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*pc_in_ignored_lib = false;
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if (track_instrumented_libs_ && !IsPcInstrumented(pc))
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return true;
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return false;
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}
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inline bool LibIgnore::IsPcInstrumented(uptr pc) const {
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const uptr n = atomic_load(&instrumented_ranges_count_, memory_order_acquire);
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for (uptr i = 0; i < n; i++) {
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if (IsInRange(pc, instrumented_code_ranges_[i]))
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return true;
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}
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return false;
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}
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} // namespace __sanitizer
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#endif // SANITIZER_LIBIGNORE_H
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