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//===-- sanitizer_stacktrace.h ----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_STACKTRACE_H
#define SANITIZER_STACKTRACE_H
#include "sanitizer_internal_defs.h"
namespace __sanitizer {
static const uptr kStackTraceMax = 256;
#if SANITIZER_LINUX && (defined(__aarch64__) || defined(__powerpc__) || \
defined(__powerpc64__) || defined(__sparc__) || \
defined(__mips__))
# define SANITIZER_CAN_FAST_UNWIND 0
#elif SANITIZER_WINDOWS
# define SANITIZER_CAN_FAST_UNWIND 0
#else
# define SANITIZER_CAN_FAST_UNWIND 1
#endif
struct StackTrace {
const uptr *trace;
uptr size;
StackTrace() : trace(nullptr), size(0) {}
StackTrace(const uptr *trace, uptr size) : trace(trace), size(size) {}
// Prints a symbolized stacktrace, followed by an empty line.
void Print() const;
static bool WillUseFastUnwind(bool request_fast_unwind) {
// Check if fast unwind is available. Fast unwind is the only option on Mac.
// It is also the only option on FreeBSD as the slow unwinding that
// leverages _Unwind_Backtrace() yields the call stack of the signal's
// handler and not of the code that raised the signal (as it does on Linux).
if (!SANITIZER_CAN_FAST_UNWIND)
return false;
else if (SANITIZER_MAC != 0 || SANITIZER_FREEBSD != 0)
return true;
return request_fast_unwind;
}
static uptr GetCurrentPc();
static uptr GetPreviousInstructionPc(uptr pc);
typedef bool (*SymbolizeCallback)(const void *pc, char *out_buffer,
int out_size);
};
// StackTrace that owns the buffer used to store the addresses.
struct BufferedStackTrace : public StackTrace {
uptr trace_buffer[kStackTraceMax];
uptr top_frame_bp; // Optional bp of a top frame.
BufferedStackTrace() : StackTrace(trace_buffer, 0), top_frame_bp(0) {}
void Unwind(uptr max_depth, uptr pc, uptr bp, void *context, uptr stack_top,
uptr stack_bottom, bool request_fast_unwind);
private:
void FastUnwindStack(uptr pc, uptr bp, uptr stack_top, uptr stack_bottom,
uptr max_depth);
void SlowUnwindStack(uptr pc, uptr max_depth);
void SlowUnwindStackWithContext(uptr pc, void *context,
uptr max_depth);
void PopStackFrames(uptr count);
uptr LocatePcInTrace(uptr pc);
};
} // namespace __sanitizer
// Use this macro if you want to print stack trace with the caller
// of the current function in the top frame.
#define GET_CALLER_PC_BP_SP \
uptr bp = GET_CURRENT_FRAME(); \
uptr pc = GET_CALLER_PC(); \
uptr local_stack; \
uptr sp = (uptr)&local_stack
#define GET_CALLER_PC_BP \
uptr bp = GET_CURRENT_FRAME(); \
uptr pc = GET_CALLER_PC();
// Use this macro if you want to print stack trace with the current
// function in the top frame.
#define GET_CURRENT_PC_BP_SP \
uptr bp = GET_CURRENT_FRAME(); \
uptr pc = StackTrace::GetCurrentPc(); \
uptr local_stack; \
uptr sp = (uptr)&local_stack
#endif // SANITIZER_STACKTRACE_H
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