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145 lines
4.6 KiB
C++
145 lines
4.6 KiB
C++
//===-- sanitizer_symbolizer.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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// Symbolizer is used by sanitizers to map instruction address to a location in
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// source code at run-time. Symbolizer either uses __sanitizer_symbolize_*
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// defined in the program, or (if they are missing) tries to find and
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// launch "llvm-symbolizer" commandline tool in a separate process and
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// communicate with it.
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//
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// Generally we should try to avoid calling system library functions during
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// symbolization (and use their replacements from sanitizer_libc.h instead).
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_SYMBOLIZER_H
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#define SANITIZER_SYMBOLIZER_H
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_libc.h"
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namespace __sanitizer {
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struct AddressInfo {
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uptr address;
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char *module;
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uptr module_offset;
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char *function;
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char *file;
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int line;
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int column;
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AddressInfo() {
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internal_memset(this, 0, sizeof(AddressInfo));
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}
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// Deletes all strings and sets all fields to zero.
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void Clear() {
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InternalFree(module);
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InternalFree(function);
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InternalFree(file);
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internal_memset(this, 0, sizeof(AddressInfo));
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}
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void FillAddressAndModuleInfo(uptr addr, const char *mod_name,
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uptr mod_offset) {
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address = addr;
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module = internal_strdup(mod_name);
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module_offset = mod_offset;
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}
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};
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struct DataInfo {
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uptr address;
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char *module;
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uptr module_offset;
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char *name;
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uptr start;
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uptr size;
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};
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class Symbolizer {
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public:
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/// Returns platform-specific implementation of Symbolizer. The symbolizer
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/// must be initialized (with init or disable) before calling this function.
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static Symbolizer *Get();
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/// Returns platform-specific implementation of Symbolizer, or null if not
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/// initialized.
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static Symbolizer *GetOrNull();
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/// Returns platform-specific implementation of Symbolizer. Will
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/// automatically initialize symbolizer as if by calling Init(0) if needed.
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static Symbolizer *GetOrInit();
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/// Initialize and return the symbolizer, given an optional path to an
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/// external symbolizer. The path argument is only required for legacy
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/// reasons as this function will check $PATH for an external symbolizer. Not
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/// thread safe.
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static Symbolizer *Init(const char* path_to_external = 0);
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/// Initialize the symbolizer in a disabled state. Not thread safe.
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static Symbolizer *Disable();
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// Fills at most "max_frames" elements of "frames" with descriptions
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// for a given address (in all inlined functions). Returns the number
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// of descriptions actually filled.
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virtual uptr SymbolizeCode(uptr address, AddressInfo *frames,
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uptr max_frames) {
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return 0;
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}
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virtual bool SymbolizeData(uptr address, DataInfo *info) {
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return false;
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}
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virtual bool IsAvailable() {
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return false;
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}
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virtual bool IsExternalAvailable() {
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return false;
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}
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// Release internal caches (if any).
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virtual void Flush() {}
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// Attempts to demangle the provided C++ mangled name.
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virtual const char *Demangle(const char *name) {
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return name;
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}
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virtual void PrepareForSandboxing() {}
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// Allow user to install hooks that would be called before/after Symbolizer
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// does the actual file/line info fetching. Specific sanitizers may need this
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// to distinguish system library calls made in user code from calls made
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// during in-process symbolization.
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typedef void (*StartSymbolizationHook)();
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typedef void (*EndSymbolizationHook)();
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// May be called at most once.
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void AddHooks(StartSymbolizationHook start_hook,
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EndSymbolizationHook end_hook);
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private:
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/// Platform-specific function for creating a Symbolizer object.
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static Symbolizer *PlatformInit(const char *path_to_external);
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/// Create a symbolizer and store it to symbolizer_ without checking if one
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/// already exists. Not thread safe.
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static Symbolizer *CreateAndStore(const char *path_to_external);
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static Symbolizer *symbolizer_;
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static StaticSpinMutex init_mu_;
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protected:
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Symbolizer();
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static LowLevelAllocator symbolizer_allocator_;
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StartSymbolizationHook start_hook_;
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EndSymbolizationHook end_hook_;
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class SymbolizerScope {
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public:
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explicit SymbolizerScope(const Symbolizer *sym);
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~SymbolizerScope();
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private:
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const Symbolizer *sym_;
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};
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};
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} // namespace __sanitizer
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#endif // SANITIZER_SYMBOLIZER_H
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