1//===-- memprof_descriptions.cpp -------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of MemProfiler, a memory profiler.
10//
11// MemProf functions for getting information about an address and/or printing
12// it.
13//===----------------------------------------------------------------------===//
14
15#include "memprof_descriptions.h"
16#include "memprof_mapping.h"
17#include "memprof_stack.h"
18#include "sanitizer_common/sanitizer_stackdepot.h"
19
20namespace __memprof {
21
22MemprofThreadIdAndName::MemprofThreadIdAndName(MemprofThreadContext *t) {
23 Init(tid: t->tid, tname: t->name);
24}
25
26MemprofThreadIdAndName::MemprofThreadIdAndName(u32 tid) {
27 if (tid == kInvalidTid) {
28 Init(tid, tname: "");
29 } else {
30 memprofThreadRegistry().CheckLocked();
31 MemprofThreadContext *t = GetThreadContextByTidLocked(tid);
32 Init(tid, tname: t->name);
33 }
34}
35
36void MemprofThreadIdAndName::Init(u32 tid, const char *tname) {
37 int len = internal_snprintf(buffer: name, length: sizeof(name), format: "T%d", tid);
38 CHECK(((unsigned int)len) < sizeof(name));
39 if (tname[0] != '\0')
40 internal_snprintf(buffer: &name[len], length: sizeof(name) - len, format: " (%s)", tname);
41}
42
43void DescribeThread(MemprofThreadContext *context) {
44 CHECK(context);
45 memprofThreadRegistry().CheckLocked();
46 // No need to announce the main thread.
47 if (context->tid == kMainTid || context->announced) {
48 return;
49 }
50 context->announced = true;
51 InternalScopedString str;
52 str.AppendF(format: "Thread %s", MemprofThreadIdAndName(context).c_str());
53 if (context->parent_tid == kInvalidTid) {
54 str.Append(str: " created by unknown thread\n");
55 Printf(format: "%s", str.data());
56 return;
57 }
58 str.AppendF(format: " created by %s here:\n",
59 MemprofThreadIdAndName(context->parent_tid).c_str());
60 Printf(format: "%s", str.data());
61 StackDepotGet(id: context->stack_id).Print();
62 // Recursively described parent thread if needed.
63 if (flags()->print_full_thread_history) {
64 MemprofThreadContext *parent_context =
65 GetThreadContextByTidLocked(tid: context->parent_tid);
66 DescribeThread(context: parent_context);
67 }
68}
69
70} // namespace __memprof
71