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
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
//===-- memprof_descriptions.cpp -------------------------------*- C++ -*-===//
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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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// MemProf functions for getting information about an address and/or printing
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// it.
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//===----------------------------------------------------------------------===//
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#include "memprof_descriptions.h"
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#include "memprof_mapping.h"
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#include "memprof_stack.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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namespace __memprof {
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MemprofThreadIdAndName::MemprofThreadIdAndName(MemprofThreadContext *t) {
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Init(t->tid, t->name);
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}
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MemprofThreadIdAndName::MemprofThreadIdAndName(u32 tid) {
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if (tid == kInvalidTid) {
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Init(tid, "");
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} else {
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memprofThreadRegistry().CheckLocked();
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MemprofThreadContext *t = GetThreadContextByTidLocked(tid);
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Init(tid, t->name);
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}
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}
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void MemprofThreadIdAndName::Init(u32 tid, const char *tname) {
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int len = internal_snprintf(name, sizeof(name), "T%d", tid);
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CHECK(((unsigned int)len) < sizeof(name));
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if (tname[0] != '\0')
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internal_snprintf(&name[len], sizeof(name) - len, " (%s)", tname);
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}
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void DescribeThread(MemprofThreadContext *context) {
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CHECK(context);
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memprofThreadRegistry().CheckLocked();
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// No need to announce the main thread.
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if (context->tid == 0 || context->announced) {
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return;
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}
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context->announced = true;
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InternalScopedString str(1024);
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str.append("Thread %s", MemprofThreadIdAndName(context).c_str());
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if (context->parent_tid == kInvalidTid) {
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str.append(" created by unknown thread\n");
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Printf("%s", str.data());
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return;
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}
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str.append(" created by %s here:\n",
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MemprofThreadIdAndName(context->parent_tid).c_str());
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Printf("%s", str.data());
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StackDepotGet(context->stack_id).Print();
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// Recursively described parent thread if needed.
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if (flags()->print_full_thread_history) {
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MemprofThreadContext *parent_context =
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GetThreadContextByTidLocked(context->parent_tid);
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DescribeThread(parent_context);
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}
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}
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} // namespace __memprof
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