623 lines
19 KiB
C++
623 lines
19 KiB
C++
//===-- sanitizer_common.h --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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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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// This file is shared between run-time libraries of sanitizers.
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//
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// It declares common functions and classes that are used in both runtimes.
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// Implementation of some functions are provided in sanitizer_common, while
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// others must be defined by run-time library itself.
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_COMMON_H
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#define SANITIZER_COMMON_H
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#include "sanitizer_flags.h"
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#include "sanitizer_interface_internal.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_list.h"
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#include "sanitizer_mutex.h"
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namespace __sanitizer {
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struct StackTrace;
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// Constants.
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const uptr kWordSize = SANITIZER_WORDSIZE / 8;
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const uptr kWordSizeInBits = 8 * kWordSize;
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#if defined(__powerpc__) || defined(__powerpc64__)
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const uptr kCacheLineSize = 128;
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#else
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const uptr kCacheLineSize = 64;
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#endif
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const uptr kMaxPathLength = 4096;
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const uptr kMaxThreadStackSize = 1 << 30; // 1Gb
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extern const char *SanitizerToolName; // Can be changed by the tool.
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extern atomic_uint32_t current_verbosity;
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INLINE void SetVerbosity(int verbosity) {
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atomic_store(¤t_verbosity, verbosity, memory_order_relaxed);
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}
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INLINE int Verbosity() {
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return atomic_load(¤t_verbosity, memory_order_relaxed);
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}
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uptr GetPageSize();
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uptr GetPageSizeCached();
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uptr GetMmapGranularity();
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uptr GetMaxVirtualAddress();
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// Threads
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uptr GetTid();
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uptr GetThreadSelf();
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void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
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uptr *stack_bottom);
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void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
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uptr *tls_addr, uptr *tls_size);
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// Memory management
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void *MmapOrDie(uptr size, const char *mem_type);
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void UnmapOrDie(void *addr, uptr size);
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void *MmapFixedNoReserve(uptr fixed_addr, uptr size);
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void *MmapNoReserveOrDie(uptr size, const char *mem_type);
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void *MmapFixedOrDie(uptr fixed_addr, uptr size);
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void *Mprotect(uptr fixed_addr, uptr size);
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// Map aligned chunk of address space; size and alignment are powers of two.
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void *MmapAlignedOrDie(uptr size, uptr alignment, const char *mem_type);
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// Used to check if we can map shadow memory to a fixed location.
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bool MemoryRangeIsAvailable(uptr range_start, uptr range_end);
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void FlushUnneededShadowMemory(uptr addr, uptr size);
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void IncreaseTotalMmap(uptr size);
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void DecreaseTotalMmap(uptr size);
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uptr GetRSS();
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void NoHugePagesInRegion(uptr addr, uptr length);
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void DontDumpShadowMemory(uptr addr, uptr length);
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// InternalScopedBuffer can be used instead of large stack arrays to
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// keep frame size low.
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// FIXME: use InternalAlloc instead of MmapOrDie once
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// InternalAlloc is made libc-free.
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template<typename T>
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class InternalScopedBuffer {
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public:
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explicit InternalScopedBuffer(uptr cnt) {
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cnt_ = cnt;
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ptr_ = (T*)MmapOrDie(cnt * sizeof(T), "InternalScopedBuffer");
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}
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~InternalScopedBuffer() {
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UnmapOrDie(ptr_, cnt_ * sizeof(T));
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}
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T &operator[](uptr i) { return ptr_[i]; }
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T *data() { return ptr_; }
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uptr size() { return cnt_ * sizeof(T); }
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private:
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T *ptr_;
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uptr cnt_;
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// Disallow evil constructors.
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InternalScopedBuffer(const InternalScopedBuffer&);
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void operator=(const InternalScopedBuffer&);
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};
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class InternalScopedString : public InternalScopedBuffer<char> {
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public:
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explicit InternalScopedString(uptr max_length)
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: InternalScopedBuffer<char>(max_length), length_(0) {
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(*this)[0] = '\0';
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}
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uptr length() { return length_; }
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void clear() {
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(*this)[0] = '\0';
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length_ = 0;
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}
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void append(const char *format, ...);
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private:
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uptr length_;
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};
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// Simple low-level (mmap-based) allocator for internal use. Doesn't have
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// constructor, so all instances of LowLevelAllocator should be
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// linker initialized.
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class LowLevelAllocator {
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public:
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// Requires an external lock.
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void *Allocate(uptr size);
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private:
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char *allocated_end_;
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char *allocated_current_;
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};
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typedef void (*LowLevelAllocateCallback)(uptr ptr, uptr size);
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// Allows to register tool-specific callbacks for LowLevelAllocator.
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// Passing NULL removes the callback.
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void SetLowLevelAllocateCallback(LowLevelAllocateCallback callback);
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// IO
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void RawWrite(const char *buffer);
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bool ColorizeReports();
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void Printf(const char *format, ...);
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void Report(const char *format, ...);
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void SetPrintfAndReportCallback(void (*callback)(const char *));
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#define VReport(level, ...) \
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do { \
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if ((uptr)Verbosity() >= (level)) Report(__VA_ARGS__); \
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} while (0)
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#define VPrintf(level, ...) \
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do { \
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if ((uptr)Verbosity() >= (level)) Printf(__VA_ARGS__); \
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} while (0)
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// Can be used to prevent mixing error reports from different sanitizers.
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extern StaticSpinMutex CommonSanitizerReportMutex;
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struct ReportFile {
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void Write(const char *buffer, uptr length);
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bool PrintsToTty();
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void SetReportPath(const char *path);
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// Don't use fields directly. They are only declared public to allow
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// aggregate initialization.
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// Protects fields below.
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StaticSpinMutex *mu;
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// Opened file descriptor. Defaults to stderr. It may be equal to
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// kInvalidFd, in which case new file will be opened when necessary.
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fd_t fd;
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// Path prefix of report file, set via __sanitizer_set_report_path.
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char path_prefix[kMaxPathLength];
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// Full path to report, obtained as <path_prefix>.PID
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char full_path[kMaxPathLength];
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// PID of the process that opened fd. If a fork() occurs,
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// the PID of child will be different from fd_pid.
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uptr fd_pid;
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private:
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void ReopenIfNecessary();
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};
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extern ReportFile report_file;
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extern uptr stoptheworld_tracer_pid;
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extern uptr stoptheworld_tracer_ppid;
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uptr OpenFile(const char *filename, bool write);
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// Opens the file 'file_name" and reads up to 'max_len' bytes.
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// The resulting buffer is mmaped and stored in '*buff'.
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// The size of the mmaped region is stored in '*buff_size',
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// Returns the number of read bytes or 0 if file can not be opened.
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uptr ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
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uptr max_len, int *errno_p = nullptr);
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// Maps given file to virtual memory, and returns pointer to it
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// (or NULL if the mapping failes). Stores the size of mmaped region
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// in '*buff_size'.
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void *MapFileToMemory(const char *file_name, uptr *buff_size);
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void *MapWritableFileToMemory(void *addr, uptr size, uptr fd, uptr offset);
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bool IsAccessibleMemoryRange(uptr beg, uptr size);
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// Error report formatting.
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const char *StripPathPrefix(const char *filepath,
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const char *strip_file_prefix);
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// Strip the directories from the module name.
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const char *StripModuleName(const char *module);
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// OS
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void DisableCoreDumperIfNecessary();
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void DumpProcessMap();
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bool FileExists(const char *filename);
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const char *GetEnv(const char *name);
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bool SetEnv(const char *name, const char *value);
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const char *GetPwd();
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char *FindPathToBinary(const char *name);
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u32 GetUid();
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void ReExec();
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bool StackSizeIsUnlimited();
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void SetStackSizeLimitInBytes(uptr limit);
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bool AddressSpaceIsUnlimited();
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void SetAddressSpaceUnlimited();
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void AdjustStackSize(void *attr);
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void PrepareForSandboxing(__sanitizer_sandbox_arguments *args);
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void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args);
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void SetSandboxingCallback(void (*f)());
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void CoverageUpdateMapping();
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void CovBeforeFork();
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void CovAfterFork(int child_pid);
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void InitializeCoverage(bool enabled, const char *coverage_dir);
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void ReInitializeCoverage(bool enabled, const char *coverage_dir);
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void InitTlsSize();
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uptr GetTlsSize();
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// Other
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void SleepForSeconds(int seconds);
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void SleepForMillis(int millis);
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u64 NanoTime();
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int Atexit(void (*function)(void));
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void SortArray(uptr *array, uptr size);
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bool TemplateMatch(const char *templ, const char *str);
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// Exit
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void NORETURN Abort();
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void NORETURN Die();
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void NORETURN
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CheckFailed(const char *file, int line, const char *cond, u64 v1, u64 v2);
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// Set the name of the current thread to 'name', return true on succees.
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// The name may be truncated to a system-dependent limit.
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bool SanitizerSetThreadName(const char *name);
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// Get the name of the current thread (no more than max_len bytes),
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// return true on succees. name should have space for at least max_len+1 bytes.
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bool SanitizerGetThreadName(char *name, int max_len);
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// Specific tools may override behavior of "Die" and "CheckFailed" functions
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// to do tool-specific job.
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typedef void (*DieCallbackType)(void);
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void SetDieCallback(DieCallbackType);
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void SetUserDieCallback(DieCallbackType);
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DieCallbackType GetDieCallback();
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typedef void (*CheckFailedCallbackType)(const char *, int, const char *,
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u64, u64);
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void SetCheckFailedCallback(CheckFailedCallbackType callback);
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// Callback will be called if soft_rss_limit_mb is given and the limit is
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// exceeded (exceeded==true) or if rss went down below the limit
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// (exceeded==false).
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// The callback should be registered once at the tool init time.
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void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded));
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// Functions related to signal handling.
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typedef void (*SignalHandlerType)(int, void *, void *);
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bool IsDeadlySignal(int signum);
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void InstallDeadlySignalHandlers(SignalHandlerType handler);
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// Alternative signal stack (POSIX-only).
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void SetAlternateSignalStack();
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void UnsetAlternateSignalStack();
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// We don't want a summary too long.
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const int kMaxSummaryLength = 1024;
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// Construct a one-line string:
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// SUMMARY: SanitizerToolName: error_message
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// and pass it to __sanitizer_report_error_summary.
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void ReportErrorSummary(const char *error_message);
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// Same as above, but construct error_message as:
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// error_type file:line function
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void ReportErrorSummary(const char *error_type, const char *file,
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int line, const char *function);
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void ReportErrorSummary(const char *error_type, StackTrace *trace);
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// Math
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#if SANITIZER_WINDOWS && !defined(__clang__) && !defined(__GNUC__)
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extern "C" {
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unsigned char _BitScanForward(unsigned long *index, unsigned long mask); // NOLINT
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unsigned char _BitScanReverse(unsigned long *index, unsigned long mask); // NOLINT
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#if defined(_WIN64)
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unsigned char _BitScanForward64(unsigned long *index, unsigned __int64 mask); // NOLINT
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unsigned char _BitScanReverse64(unsigned long *index, unsigned __int64 mask); // NOLINT
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#endif
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}
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#endif
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INLINE uptr MostSignificantSetBitIndex(uptr x) {
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CHECK_NE(x, 0U);
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unsigned long up; // NOLINT
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#if !SANITIZER_WINDOWS || defined(__clang__) || defined(__GNUC__)
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up = SANITIZER_WORDSIZE - 1 - __builtin_clzl(x);
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#elif defined(_WIN64)
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_BitScanReverse64(&up, x);
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#else
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_BitScanReverse(&up, x);
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#endif
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return up;
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}
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INLINE uptr LeastSignificantSetBitIndex(uptr x) {
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CHECK_NE(x, 0U);
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unsigned long up; // NOLINT
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#if !SANITIZER_WINDOWS || defined(__clang__) || defined(__GNUC__)
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up = __builtin_ctzl(x);
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#elif defined(_WIN64)
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_BitScanForward64(&up, x);
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#else
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_BitScanForward(&up, x);
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#endif
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return up;
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}
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INLINE bool IsPowerOfTwo(uptr x) {
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return (x & (x - 1)) == 0;
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}
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INLINE uptr RoundUpToPowerOfTwo(uptr size) {
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CHECK(size);
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if (IsPowerOfTwo(size)) return size;
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uptr up = MostSignificantSetBitIndex(size);
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CHECK(size < (1ULL << (up + 1)));
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CHECK(size > (1ULL << up));
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return 1UL << (up + 1);
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}
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INLINE uptr RoundUpTo(uptr size, uptr boundary) {
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CHECK(IsPowerOfTwo(boundary));
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return (size + boundary - 1) & ~(boundary - 1);
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}
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INLINE uptr RoundDownTo(uptr x, uptr boundary) {
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return x & ~(boundary - 1);
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}
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INLINE bool IsAligned(uptr a, uptr alignment) {
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return (a & (alignment - 1)) == 0;
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}
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INLINE uptr Log2(uptr x) {
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CHECK(IsPowerOfTwo(x));
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#if !SANITIZER_WINDOWS || defined(__clang__) || defined(__GNUC__)
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return __builtin_ctzl(x);
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#elif defined(_WIN64)
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unsigned long ret; // NOLINT
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_BitScanForward64(&ret, x);
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return ret;
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#else
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unsigned long ret; // NOLINT
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_BitScanForward(&ret, x);
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return ret;
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#endif
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}
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// Don't use std::min, std::max or std::swap, to minimize dependency
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// on libstdc++.
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template<class T> T Min(T a, T b) { return a < b ? a : b; }
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template<class T> T Max(T a, T b) { return a > b ? a : b; }
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template<class T> void Swap(T& a, T& b) {
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T tmp = a;
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a = b;
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b = tmp;
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}
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// Char handling
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INLINE bool IsSpace(int c) {
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return (c == ' ') || (c == '\n') || (c == '\t') ||
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(c == '\f') || (c == '\r') || (c == '\v');
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}
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INLINE bool IsDigit(int c) {
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return (c >= '0') && (c <= '9');
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}
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INLINE int ToLower(int c) {
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return (c >= 'A' && c <= 'Z') ? (c + 'a' - 'A') : c;
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}
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// A low-level vector based on mmap. May incur a significant memory overhead for
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// small vectors.
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// WARNING: The current implementation supports only POD types.
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template<typename T>
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class InternalMmapVectorNoCtor {
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public:
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void Initialize(uptr initial_capacity) {
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capacity_ = Max(initial_capacity, (uptr)1);
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size_ = 0;
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data_ = (T *)MmapOrDie(capacity_ * sizeof(T), "InternalMmapVectorNoCtor");
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}
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void Destroy() {
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UnmapOrDie(data_, capacity_ * sizeof(T));
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}
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T &operator[](uptr i) {
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CHECK_LT(i, size_);
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return data_[i];
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}
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const T &operator[](uptr i) const {
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CHECK_LT(i, size_);
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return data_[i];
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}
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void push_back(const T &element) {
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CHECK_LE(size_, capacity_);
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if (size_ == capacity_) {
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uptr new_capacity = RoundUpToPowerOfTwo(size_ + 1);
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Resize(new_capacity);
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}
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data_[size_++] = element;
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}
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T &back() {
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CHECK_GT(size_, 0);
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return data_[size_ - 1];
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}
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void pop_back() {
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CHECK_GT(size_, 0);
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size_--;
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}
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uptr size() const {
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return size_;
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}
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const T *data() const {
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return data_;
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}
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uptr capacity() const {
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return capacity_;
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}
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void clear() { size_ = 0; }
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private:
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void Resize(uptr new_capacity) {
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CHECK_GT(new_capacity, 0);
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CHECK_LE(size_, new_capacity);
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T *new_data = (T *)MmapOrDie(new_capacity * sizeof(T),
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"InternalMmapVector");
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internal_memcpy(new_data, data_, size_ * sizeof(T));
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T *old_data = data_;
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data_ = new_data;
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UnmapOrDie(old_data, capacity_ * sizeof(T));
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capacity_ = new_capacity;
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}
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T *data_;
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uptr capacity_;
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uptr size_;
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};
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template<typename T>
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class InternalMmapVector : public InternalMmapVectorNoCtor<T> {
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public:
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explicit InternalMmapVector(uptr initial_capacity) {
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InternalMmapVectorNoCtor<T>::Initialize(initial_capacity);
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}
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~InternalMmapVector() { InternalMmapVectorNoCtor<T>::Destroy(); }
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// Disallow evil constructors.
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InternalMmapVector(const InternalMmapVector&);
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void operator=(const InternalMmapVector&);
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};
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// HeapSort for arrays and InternalMmapVector.
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template<class Container, class Compare>
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void InternalSort(Container *v, uptr size, Compare comp) {
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if (size < 2)
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return;
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// Stage 1: insert elements to the heap.
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for (uptr i = 1; i < size; i++) {
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uptr j, p;
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for (j = i; j > 0; j = p) {
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p = (j - 1) / 2;
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if (comp((*v)[p], (*v)[j]))
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Swap((*v)[j], (*v)[p]);
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else
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break;
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}
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}
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// Stage 2: swap largest element with the last one,
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// and sink the new top.
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for (uptr i = size - 1; i > 0; i--) {
|
|
Swap((*v)[0], (*v)[i]);
|
|
uptr j, max_ind;
|
|
for (j = 0; j < i; j = max_ind) {
|
|
uptr left = 2 * j + 1;
|
|
uptr right = 2 * j + 2;
|
|
max_ind = j;
|
|
if (left < i && comp((*v)[max_ind], (*v)[left]))
|
|
max_ind = left;
|
|
if (right < i && comp((*v)[max_ind], (*v)[right]))
|
|
max_ind = right;
|
|
if (max_ind != j)
|
|
Swap((*v)[j], (*v)[max_ind]);
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
template<class Container, class Value, class Compare>
|
|
uptr InternalBinarySearch(const Container &v, uptr first, uptr last,
|
|
const Value &val, Compare comp) {
|
|
uptr not_found = last + 1;
|
|
while (last >= first) {
|
|
uptr mid = (first + last) / 2;
|
|
if (comp(v[mid], val))
|
|
first = mid + 1;
|
|
else if (comp(val, v[mid]))
|
|
last = mid - 1;
|
|
else
|
|
return mid;
|
|
}
|
|
return not_found;
|
|
}
|
|
|
|
// Represents a binary loaded into virtual memory (e.g. this can be an
|
|
// executable or a shared object).
|
|
class LoadedModule {
|
|
public:
|
|
LoadedModule(const char *module_name, uptr base_address);
|
|
void clear();
|
|
void addAddressRange(uptr beg, uptr end, bool executable);
|
|
bool containsAddress(uptr address) const;
|
|
|
|
const char *full_name() const { return full_name_; }
|
|
uptr base_address() const { return base_address_; }
|
|
|
|
struct AddressRange {
|
|
AddressRange *next;
|
|
uptr beg;
|
|
uptr end;
|
|
bool executable;
|
|
|
|
AddressRange(uptr beg, uptr end, bool executable)
|
|
: next(nullptr), beg(beg), end(end), executable(executable) {}
|
|
};
|
|
|
|
typedef IntrusiveList<AddressRange>::ConstIterator Iterator;
|
|
Iterator ranges() const { return Iterator(&ranges_); }
|
|
|
|
private:
|
|
char *full_name_; // Owned.
|
|
uptr base_address_;
|
|
IntrusiveList<AddressRange> ranges_;
|
|
};
|
|
|
|
// OS-dependent function that fills array with descriptions of at most
|
|
// "max_modules" currently loaded modules. Returns the number of
|
|
// initialized modules. If filter is nonzero, ignores modules for which
|
|
// filter(full_name) is false.
|
|
typedef bool (*string_predicate_t)(const char *);
|
|
uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
|
|
string_predicate_t filter);
|
|
|
|
#if SANITIZER_POSIX
|
|
const uptr kPthreadDestructorIterations = 4;
|
|
#else
|
|
// Unused on Windows.
|
|
const uptr kPthreadDestructorIterations = 0;
|
|
#endif
|
|
|
|
// Callback type for iterating over a set of memory ranges.
|
|
typedef void (*RangeIteratorCallback)(uptr begin, uptr end, void *arg);
|
|
|
|
#if SANITIZER_ANDROID
|
|
// Initialize Android logging. Any writes before this are silently lost.
|
|
void AndroidLogInit();
|
|
void AndroidLogWrite(const char *buffer);
|
|
void GetExtraActivationFlags(char *buf, uptr size);
|
|
void SanitizerInitializeUnwinder();
|
|
#else
|
|
INLINE void AndroidLogInit() {}
|
|
INLINE void AndroidLogWrite(const char *buffer_unused) {}
|
|
INLINE void GetExtraActivationFlags(char *buf, uptr size) { *buf = '\0'; }
|
|
INLINE void SanitizerInitializeUnwinder() {}
|
|
#endif
|
|
|
|
void *internal_start_thread(void(*func)(void*), void *arg);
|
|
void internal_join_thread(void *th);
|
|
void MaybeStartBackgroudThread();
|
|
|
|
// Make the compiler think that something is going on there.
|
|
// Use this inside a loop that looks like memset/memcpy/etc to prevent the
|
|
// compiler from recognising it and turning it into an actual call to
|
|
// memset/memcpy/etc.
|
|
static inline void SanitizerBreakOptimization(void *arg) {
|
|
#if _MSC_VER
|
|
// FIXME: make sure this is actually enough.
|
|
__asm;
|
|
#else
|
|
__asm__ __volatile__("" : : "r" (arg) : "memory");
|
|
#endif
|
|
}
|
|
|
|
} // namespace __sanitizer
|
|
|
|
inline void *operator new(__sanitizer::operator_new_size_type size,
|
|
__sanitizer::LowLevelAllocator &alloc) {
|
|
return alloc.Allocate(size);
|
|
}
|
|
|
|
struct StackDepotStats {
|
|
uptr n_uniq_ids;
|
|
uptr allocated;
|
|
};
|
|
|
|
#endif // SANITIZER_COMMON_H
|