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3d4bba302d
See RFC for background: http://lists.llvm.org/pipermail/llvm-dev/2020-June/142744.html Follow on companion to the clang/llvm instrumentation support in D85948 and committed earlier. This patch adds the compiler-rt runtime support for the memory profiling. Note that much of this support was cloned from asan (and then greatly simplified and renamed). For example the interactions with the sanitizer_common allocators, error handling, interception, etc. The bulk of the memory profiling specific code can be found in the MemInfoBlock, MemInfoBlockCache, and related classes defined and used in memprof_allocator.cpp. For now, the memory profile is dumped to text (stderr by default, but honors the sanitizer_common log_path flag). It is dumped in either a default verbose format, or an optional terse format. This patch also adds a set of tests for the core functionality. Differential Revision: https://reviews.llvm.org/D87120
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
//===-- memprof_stack.cpp ------------------------------------------------===//
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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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// This file is a part of MemProfiler, a memory profiler.
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//
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// Code for MemProf stack trace.
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//===----------------------------------------------------------------------===//
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#include "memprof_stack.h"
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#include "memprof_internal.h"
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#include "sanitizer_common/sanitizer_atomic.h"
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namespace __memprof {
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static atomic_uint32_t malloc_context_size;
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void SetMallocContextSize(u32 size) {
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atomic_store(&malloc_context_size, size, memory_order_release);
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}
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u32 GetMallocContextSize() {
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return atomic_load(&malloc_context_size, memory_order_acquire);
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}
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} // namespace __memprof
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void __sanitizer::BufferedStackTrace::UnwindImpl(uptr pc, uptr bp,
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void *context,
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bool request_fast,
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u32 max_depth) {
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using namespace __memprof;
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size = 0;
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if (UNLIKELY(!memprof_inited))
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return;
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request_fast = StackTrace::WillUseFastUnwind(request_fast);
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MemprofThread *t = GetCurrentThread();
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if (request_fast) {
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if (t) {
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Unwind(max_depth, pc, bp, nullptr, t->stack_top(), t->stack_bottom(),
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true);
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}
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return;
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}
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Unwind(max_depth, pc, bp, context, 0, 0, false);
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}
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// ------------------ Interface -------------- {{{1
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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void __sanitizer_print_stack_trace() {
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using namespace __memprof;
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PRINT_CURRENT_STACK();
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}
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} // extern "C"
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