compiler-rt/lib/memprof/memprof_descriptions.cpp

   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
  20 namespace __memprof {
  21
  22 MemprofThreadIdAndName::MemprofThreadIdAndName(MemprofThreadContext *t) {
  23   Init(t->tid, t->name);
  24 }
  25
  26 MemprofThreadIdAndName::MemprofThreadIdAndName(u32 tid) {
  27   if (tid == kInvalidTid) {
  28     Init(tid, "");
  29   } else {
  30     memprofThreadRegistry().CheckLocked();
  31     MemprofThreadContext *t = GetThreadContextByTidLocked(tid);
  32     Init(tid, t->name);
  33   }
  34 }
  35
  36 void MemprofThreadIdAndName::Init(u32 tid, const char *tname) {
  37   int len = internal_snprintf(name, sizeof(name), "T%d", tid);
  38   CHECK(((unsigned int)len) < sizeof(name));
  39   if (tname[0] != '\0')
  40     internal_snprintf(&name[len], sizeof(name) - len, " (%s)", tname);
  41 }
  42
  43 void 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.append("Thread %s", MemprofThreadIdAndName(context).c_str());
  53   if (context->parent_tid == kInvalidTid) {
  54     str.append(" created by unknown thread\n");
  55     Printf("%s", str.data());
  56     return;
  57   }
  58   str.append(" created by %s here:\n",
  59              MemprofThreadIdAndName(context->parent_tid).c_str());
  60   Printf("%s", str.data());
  61   StackDepotGet(context->stack_id).Print();
  62   // Recursively described parent thread if needed.
  63   if (flags()->print_full_thread_history) {
  64     MemprofThreadContext *parent_context =
  65         GetThreadContextByTidLocked(context->parent_tid);
  66     DescribeThread(parent_context);
  67   }
  68 }
  69
  70 } // namespace __memprof