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1' Copyright (c) 2021-2022 Huawei Device Co., Ltd.
2' Licensed under the Apache License, Version 2.0 (the "License");
3' you may not use this file except in compliance with the License.
4' You may obtain a copy of the License at
5'
6' http://www.apache.org/licenses/LICENSE-2.0
7'
8' Unless required by applicable law or agreed to in writing, software
9' distributed under the License is distributed on an "AS IS" BASIS,
10' WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11' See the License for the specific language governing permissions and
12' limitations under the License.
13
14@startuml
15
16title Print Stacktraces at Safepoints
17
18skinparam monochrome true
19
20ManagedThread -> stacktrace.cpp: GetStacktrace
21stacktrace.cpp -> ManagedThread: stacktrace (array of function call instruction addresses)
22ManagedThread -> StackPrinter: Print the stacktrace
23StackPrinter -> "~/proc~/self~/maps": ReadVma (read used libraries and associated addresses)
24"~/proc~/self~/maps" -> StackPrinter: Array of VMA (virtual memory area)
25StackPrinter -> StackPrinter: For each address, find the corresponding VMA and determine the library file
26StackPrinter -> libdwarf: Read debug info from the library file
27libdwarf -> StackPrinter: Debug info
28StackPrinter -> libdwarf: Get function name, source file and line number
29libdwarf -> StackPrinter: mangled function name (non-human readable), source file and line number
30StackPrinter -> "libstdc++": Demangle function name (Get human readable function name)
31"libstdc++" -> StackPrinter: human readable function name
32StackPrinter -> "output stream": Print
33@enduml
34