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//===-- asan_stack.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 a part of AddressSanitizer, an address sanity checker.
//
// ASan-private header for asan_stack.cc.
//===----------------------------------------------------------------------===//
#ifndef ASAN_STACK_H
#define ASAN_STACK_H
#include "asan_flags.h"
#include "asan_thread.h"
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_stacktrace.h"
namespace __asan {
static const u32 kDefaultMallocContextSize = 30;
void SetMallocContextSize(u32 size);
u32 GetMallocContextSize();
// Get the stack trace with the given pc and bp.
// The pc will be in the position 0 of the resulting stack trace.
// The bp may refer to the current frame or to the caller's frame.
ALWAYS_INLINE
void GetStackTraceWithPcBpAndContext(BufferedStackTrace *stack, uptr max_depth,
uptr pc, uptr bp, void *context,
bool fast) {
#if SANITIZER_WINDOWS
stack->Unwind(max_depth, pc, bp, context, 0, 0, fast);
#else
AsanThread *t;
stack->size = 0;
if (LIKELY(asan_inited)) {
if ((t = GetCurrentThread()) && !t->isUnwinding()) {
// On FreeBSD 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_FREEBSD && t->isInDeadlySignal()) fast = true;
uptr stack_top = t->stack_top();
uptr stack_bottom = t->stack_bottom();
ScopedUnwinding unwind_scope(t);
stack->Unwind(max_depth, pc, bp, context, stack_top, stack_bottom, fast);
} else if (!t && !fast) {
/* If GetCurrentThread() has failed, try to do slow unwind anyways. */
stack->Unwind(max_depth, pc, bp, context, 0, 0, false);
}
}
#endif // SANITIZER_WINDOWS
}
} // namespace __asan
// NOTE: A Rule of thumb is to retrieve stack trace in the interceptors
// as early as possible (in functions exposed to the user), as we generally
// don't want stack trace to contain functions from ASan internals.
#define GET_STACK_TRACE(max_size, fast) \
BufferedStackTrace stack; \
if (max_size <= 2) { \
stack.size = max_size; \
if (max_size > 0) { \
stack.top_frame_bp = GET_CURRENT_FRAME(); \
stack.trace_buffer[0] = StackTrace::GetCurrentPc(); \
if (max_size > 1) \
stack.trace_buffer[1] = GET_CALLER_PC(); \
} \
} else { \
GetStackTraceWithPcBpAndContext(&stack, max_size, \
StackTrace::GetCurrentPc(), \
GET_CURRENT_FRAME(), 0, fast); \
}
#define GET_STACK_TRACE_FATAL(pc, bp) \
BufferedStackTrace stack; \
GetStackTraceWithPcBpAndContext(&stack, kStackTraceMax, pc, bp, 0, \
common_flags()->fast_unwind_on_fatal)
#define GET_STACK_TRACE_SIGNAL(sig) \
BufferedStackTrace stack; \
GetStackTraceWithPcBpAndContext(&stack, kStackTraceMax, \
(sig).pc, (sig).bp, (sig).context, \
common_flags()->fast_unwind_on_fatal)
#define GET_STACK_TRACE_FATAL_HERE \
GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_fatal)
#define GET_STACK_TRACE_CHECK_HERE \
GET_STACK_TRACE(kStackTraceMax, common_flags()->fast_unwind_on_check)
#define GET_STACK_TRACE_THREAD \
GET_STACK_TRACE(kStackTraceMax, true)
#define GET_STACK_TRACE_MALLOC \
GET_STACK_TRACE(GetMallocContextSize(), common_flags()->fast_unwind_on_malloc)
#define GET_STACK_TRACE_FREE GET_STACK_TRACE_MALLOC
#define PRINT_CURRENT_STACK() \
{ \
GET_STACK_TRACE_FATAL_HERE; \
stack.Print(); \
}
#define PRINT_CURRENT_STACK_CHECK() \
{ \
GET_STACK_TRACE_CHECK_HERE; \
stack.Print(); \
}
#endif // ASAN_STACK_H
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