mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-11-30 15:24:07 +08:00
116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
//===-- sanitizer_libignore.h -----------------------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// LibIgnore allows to ignore all interceptors called from a particular set
|
|
// of dynamic libraries. LibIgnore can be initialized with several templates
|
|
// of names of libraries to be ignored. It 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_atomic.h"
|
|
#include "sanitizer_mutex.h"
|
|
|
|
namespace __sanitizer {
|
|
|
|
class LibIgnore {
|
|
public:
|
|
explicit LibIgnore(LinkerInitialized);
|
|
|
|
// Must be called during initialization.
|
|
void AddIgnoredLibrary(const char *name_templ);
|
|
void IgnoreNoninstrumentedModules(bool enable) {
|
|
track_instrumented_libs_ = enable;
|
|
}
|
|
|
|
// 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 or
|
|
// the PC should be ignored because it belongs to an non-instrumented module
|
|
// (when ignore_noninstrumented_modules=1). Also returns true via
|
|
// "pc_in_ignored_lib" if the PC is in an ignored library, false otherwise.
|
|
bool IsIgnored(uptr pc, bool *pc_in_ignored_lib) const;
|
|
|
|
// Checks whether the provided PC belongs to an instrumented module.
|
|
bool IsPcInstrumented(uptr pc) const;
|
|
|
|
private:
|
|
struct Lib {
|
|
char *templ;
|
|
char *name;
|
|
char *real_name; // target of symlink
|
|
bool loaded;
|
|
};
|
|
|
|
struct LibCodeRange {
|
|
uptr begin;
|
|
uptr end;
|
|
};
|
|
|
|
inline bool IsInRange(uptr pc, const LibCodeRange &range) const {
|
|
return (pc >= range.begin && pc < range.end);
|
|
}
|
|
|
|
static const uptr kMaxIgnoredRanges = 128;
|
|
static const uptr kMaxInstrumentedRanges = 1024;
|
|
static const uptr kMaxLibs = 1024;
|
|
|
|
// Hot part:
|
|
atomic_uintptr_t ignored_ranges_count_;
|
|
LibCodeRange ignored_code_ranges_[kMaxIgnoredRanges];
|
|
|
|
atomic_uintptr_t instrumented_ranges_count_;
|
|
LibCodeRange instrumented_code_ranges_[kMaxInstrumentedRanges];
|
|
|
|
// Cold part:
|
|
Mutex mutex_;
|
|
uptr count_;
|
|
Lib libs_[kMaxLibs];
|
|
bool track_instrumented_libs_;
|
|
|
|
// Disallow copying of LibIgnore objects.
|
|
LibIgnore(const LibIgnore&); // not implemented
|
|
void operator = (const LibIgnore&); // not implemented
|
|
};
|
|
|
|
inline bool LibIgnore::IsIgnored(uptr pc, bool *pc_in_ignored_lib) const {
|
|
const uptr n = atomic_load(&ignored_ranges_count_, memory_order_acquire);
|
|
for (uptr i = 0; i < n; i++) {
|
|
if (IsInRange(pc, ignored_code_ranges_[i])) {
|
|
*pc_in_ignored_lib = true;
|
|
return true;
|
|
}
|
|
}
|
|
*pc_in_ignored_lib = false;
|
|
if (track_instrumented_libs_ && !IsPcInstrumented(pc))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
inline bool LibIgnore::IsPcInstrumented(uptr pc) const {
|
|
const uptr n = atomic_load(&instrumented_ranges_count_, memory_order_acquire);
|
|
for (uptr i = 0; i < n; i++) {
|
|
if (IsInRange(pc, instrumented_code_ranges_[i]))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
} // namespace __sanitizer
|
|
|
|
#endif // SANITIZER_LIBIGNORE_H
|