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//===------------------ sanitizer_unwind_fuchsia.cpp
//---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// Sanitizer unwind Fuchsia specific functions.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_FUCHSIA
# include <limits.h>
# include <unwind.h>
# include "sanitizer_common.h"
# include "sanitizer_stacktrace.h"
namespace __sanitizer {
# if SANITIZER_CAN_SLOW_UNWIND
struct UnwindTraceArg {
BufferedStackTrace *stack;
u32 max_depth;
};
_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
UnwindTraceArg *arg = static_cast<UnwindTraceArg *>(param);
CHECK_LT(arg->stack->size, arg->max_depth);
uptr pc = _Unwind_GetIP(ctx);
if (pc < GetPageSizeCached())
return _URC_NORMAL_STOP;
arg->stack->trace_buffer[arg->stack->size++] = pc;
return (arg->stack->size == arg->max_depth ? _URC_NORMAL_STOP
: _URC_NO_REASON);
}
void BufferedStackTrace::UnwindSlow(uptr pc, u32 max_depth) {
CHECK_GE(max_depth, 2);
size = 0;
UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
_Unwind_Backtrace(Unwind_Trace, &arg);
CHECK_GT(size, 0);
// We need to pop a few frames so that pc is on top.
uptr to_pop = LocatePcInTrace(pc);
// trace_buffer[0] belongs to the current function so we always pop it,
// unless there is only 1 frame in the stack trace (1 frame is always better
// than 0!).
PopStackFrames(Min(to_pop, static_cast<uptr>(1)));
trace_buffer[0] = pc;
}
void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {
CHECK(context);
CHECK_GE(max_depth, 2);
UNREACHABLE("signal context doesn't exist");
}
# endif // SANITIZER_CAN_SLOW_UNWIND
} // namespace __sanitizer
#endif // SANITIZER_FUCHSIA
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