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83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
//===-- sanitizer_libignore.h -----------------------------------*- C++ -*-===//
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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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// LibIgnore allows to ignore all interceptors called from a particular set
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// of dynamic libraries. LibIgnore remembers all "called_from_lib" suppressions
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// from the provided SuppressionContext; 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_suppressions.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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// Fetches all "called_from_lib" suppressions from the SuppressionContext.
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void Init(const SuppressionContext &supp);
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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.
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bool IsIgnored(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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static const uptr kMaxLibs = 128;
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// Hot part:
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atomic_uintptr_t loaded_count_;
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LibCodeRange code_ranges_[kMaxLibs];
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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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// 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) const {
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const uptr n = atomic_load(&loaded_count_, memory_order_acquire);
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for (uptr i = 0; i < n; i++) {
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if (pc >= code_ranges_[i].begin && pc < code_ranges_[i].end)
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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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