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