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//===-- sanitizer_libignore.h -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// LibIgnore allows to ignore all interceptors called from a particular set
// of dynamic libraries. LibIgnore remembers all "called_from_lib" suppressions
// from the provided SuppressionContext; finds code ranges for the libraries;
// and checks whether the provided PC value belongs to the code ranges.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_LIBIGNORE_H
#define SANITIZER_LIBIGNORE_H
#include "sanitizer_internal_defs.h"
#include "sanitizer_common.h"
#include "sanitizer_suppressions.h"
#include "sanitizer_atomic.h"
#include "sanitizer_mutex.h"
namespace __sanitizer {
class LibIgnore {
public:
explicit LibIgnore(LinkerInitialized);
// Fetches all "called_from_lib" suppressions from the SuppressionContext.
void Init(const SuppressionContext &supp);
// Must be called after a new dynamic library is loaded.
void OnLibraryLoaded(const char *name);
// Must be called after a dynamic library is unloaded.
void OnLibraryUnloaded();
// Checks whether the provided PC belongs to one of the ignored libraries.
bool IsIgnored(uptr pc) const;
private:
struct Lib {
char *templ;
char *name;
char *real_name; // target of symlink
bool loaded;
};
struct LibCodeRange {
uptr begin;
uptr end;
};
static const uptr kMaxLibs = 128;
// Hot part:
atomic_uintptr_t loaded_count_;
LibCodeRange code_ranges_[kMaxLibs];
// Cold part:
BlockingMutex mutex_;
uptr count_;
Lib libs_[kMaxLibs];
// Disallow copying of LibIgnore objects.
LibIgnore(const LibIgnore&); // not implemented
void operator = (const LibIgnore&); // not implemented
};
inline bool LibIgnore::IsIgnored(uptr pc) const {
const uptr n = atomic_load(&loaded_count_, memory_order_acquire);
for (uptr i = 0; i < n; i++) {
if (pc >= code_ranges_[i].begin && pc < code_ranges_[i].end)
return true;
}
return false;
}
} // namespace __sanitizer
#endif // SANITIZER_LIBIGNORE_H
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