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