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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_internal.h"
namespace __asan {
static const uptr kStackTraceMax = 64;
struct AsanStackTrace {
uptr size;
uptr max_size;
uptr trace[kStackTraceMax];
static void PrintStack(uptr *addr, uptr size);
void PrintStack() {
PrintStack(this->trace, this->size);
}
void CopyTo(uptr *dst, uptr dst_size) {
for (uptr i = 0; i < size && i < dst_size; i++)
dst[i] = trace[i];
for (uptr i = size; i < dst_size; i++)
dst[i] = 0;
}
void CopyFrom(uptr *src, uptr src_size) {
size = src_size;
if (size > kStackTraceMax) size = kStackTraceMax;
for (uptr i = 0; i < size; i++) {
trace[i] = src[i];
}
}
void GetStackTrace(uptr max_s, uptr pc, uptr bp);
void FastUnwindStack(uptr pc, uptr bp);
static uptr GetCurrentPc();
static uptr CompressStack(AsanStackTrace *stack,
u32 *compressed, uptr size);
static void UncompressStack(AsanStackTrace *stack,
u32 *compressed, uptr size);
};
} // namespace __asan
// 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
// 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 = AsanStackTrace::GetCurrentPc(); \
uptr local_stack; \
uptr sp = (uptr)&local_stack
// 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.
// fast_unwind is currently unused.
#define GET_STACK_TRACE_WITH_PC_AND_BP(max_s, pc, bp) \
AsanStackTrace stack; \
stack.GetStackTrace(max_s, pc, bp)
// 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_HERE(max_size) \
GET_STACK_TRACE_WITH_PC_AND_BP(max_size, \
AsanStackTrace::GetCurrentPc(), GET_CURRENT_FRAME())
#define GET_STACK_TRACE_HERE_FOR_MALLOC \
GET_STACK_TRACE_HERE(flags()->malloc_context_size)
#define GET_STACK_TRACE_HERE_FOR_FREE(ptr) \
GET_STACK_TRACE_HERE(flags()->malloc_context_size)
#define PRINT_CURRENT_STACK() \
{ \
GET_STACK_TRACE_HERE(kStackTraceMax); \
stack.PrintStack(); \
}
#endif // ASAN_STACK_H
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