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1 //===-- tsan_stack_trace.cpp ----------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is a part of ThreadSanitizer (TSan), a race detector.
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10 //
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11 //===----------------------------------------------------------------------===//
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12 #include "tsan_stack_trace.h"
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13 #include "tsan_rtl.h"
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14 #include "tsan_mman.h"
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15
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16 namespace __tsan {
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17
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18 VarSizeStackTrace::VarSizeStackTrace()
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19 : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
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20
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21 VarSizeStackTrace::~VarSizeStackTrace() {
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22 ResizeBuffer(0);
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23 }
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24
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25 void VarSizeStackTrace::ResizeBuffer(uptr new_size) {
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26 if (trace_buffer) {
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27 internal_free(trace_buffer);
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28 }
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29 trace_buffer =
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30 (new_size > 0)
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31 ? (uptr *)internal_alloc(MBlockStackTrace,
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32 new_size * sizeof(trace_buffer[0]))
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33 : nullptr;
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34 trace = trace_buffer;
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35 size = new_size;
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36 }
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37
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38 void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
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39 ResizeBuffer(cnt + !!extra_top_pc);
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40 internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
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41 if (extra_top_pc)
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42 trace_buffer[cnt] = extra_top_pc;
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43 }
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44
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45 void VarSizeStackTrace::ReverseOrder() {
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46 for (u32 i = 0; i < (size >> 1); i++)
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47 Swap(trace_buffer[i], trace_buffer[size - 1 - i]);
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48 }
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49
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50 } // namespace __tsan
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51
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52 #if !SANITIZER_GO
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53 void __sanitizer::BufferedStackTrace::UnwindImpl(
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54 uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
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55 uptr top = 0;
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56 uptr bottom = 0;
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57 if (StackTrace::WillUseFastUnwind(request_fast)) {
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58 GetThreadStackTopAndBottom(false, &top, &bottom);
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59 Unwind(max_depth, pc, bp, nullptr, top, bottom, true);
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60 } else
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61 Unwind(max_depth, pc, 0, context, 0, 0, false);
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62 }
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63 #endif // SANITIZER_GO
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