40733a8024
Summary: This change removes `__tsan::StackTrace` class. There are now three alternatives: # Lightweight `__sanitizer::StackTrace`, which doesn't own a buffer of PCs. It is used in functions that need stack traces in read-only mode, and helps to prevent unnecessary allocations/copies (e.g. for StackTraces fetched from StackDepot). # `__sanitizer::BufferedStackTrace`, which stores buffer of PCs in a constant array. It is used in TraceHeader (non-Go version) # `__tsan::VarSizeStackTrace`, which owns buffer of PCs, dynamically allocated via TSan internal allocator. Test Plan: compiler-rt test suite Reviewers: dvyukov, kcc Reviewed By: kcc Subscribers: llvm-commits, kcc Differential Revision: http://reviews.llvm.org/D6004 llvm-svn: 221194
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
//===-- tsan_stack_trace.cc -----------------------------------------------===//
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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 ThreadSanitizer (TSan), a race detector.
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//
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//===----------------------------------------------------------------------===//
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#include "tsan_stack_trace.h"
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#include "tsan_rtl.h"
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#include "tsan_mman.h"
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namespace __tsan {
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VarSizeStackTrace::VarSizeStackTrace()
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: StackTrace(nullptr, 0), trace_buffer(nullptr) {}
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VarSizeStackTrace::~VarSizeStackTrace() {
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ResizeBuffer(0);
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}
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void VarSizeStackTrace::ResizeBuffer(uptr new_size) {
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if (trace_buffer) {
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internal_free(trace_buffer);
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}
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trace_buffer =
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(new_size > 0)
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? (uptr *)internal_alloc(MBlockStackTrace,
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new_size * sizeof(trace_buffer[0]))
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: nullptr;
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trace = trace_buffer;
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size = new_size;
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}
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void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
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ResizeBuffer(cnt + !!extra_top_pc);
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internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
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if (extra_top_pc)
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trace_buffer[cnt] = extra_top_pc;
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}
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} // namespace __tsan
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