在 VSCode Fortran 调试中检查从另一个模块导入的变量 [英] Inspect variable imported from another module in VSCode Fortran debugging

问题描述

我正在调试一些包含许多 Fortran 模块的代码，其中一些模块彼此共享变量.不幸的是，带有 VScode 的 gdb 在调试时似乎无法检查导入的变量.

I am debugging some code that contains many Fortran modules, some of which share variables between each other. Unfortunately, gdb with VScode seems to have trouble inspecting imported variables when debugging.

目前，当我需要检查导入的变量时，唯一的方法是停止调试，并手动更改代码以包含与导入变量相等的局部变量.在下面的示例中，要找出将 foo%bar 的值传递给函数 a_function，我必须声明一个新变量，就像这样

Currently when I need to inspect an imported variable, the only way to do so is to stop debugging, and manually alter the code to include a local variable equal to the imported variable. In the example below, to find out what value of foo%bar is passed to the function a_function I would have to declare a new variable, like so

module setup
  type(customDerived) :: foo
  foo%bar = 1
end module setup

module example
  use setup, only: foo
  integer(ik) :: foobar    <-- Stop debugging, add these lines, restart and inspect 'foobar'
  foobar = foo%bar         <--
  a_function(foo%bar)
end module example

这显然很费时间，不知道为什么VSCode应该不能检查全局变量.有任何想法吗?以下是我目前在 makefile 中开启的 gfortran 编译器标志

This is obviously very time consuming, and I don't know why VSCode should not be able to inspect global variables. Any ideas? The following are the gfortran compiler flags I currently have turned on in the makefile

-Og -g -Wall -Wextra -Wline-truncation -pedantic -fimplicit-none -fcheck=all -fbacktrace

推荐答案

此问题已部分处理:调试器中不可访问的 Fortran 模块变量.基本上，在 Visual Studio Code 的 WATCH 面板中，您可以添加表达式".并使用语法 module::variable 观察模块变量.

This issue has been partly treated in: Fortran module variables not accessible in debuggers. Basically, in the WATCH panel from Visual Studio Code, you can "add expression" and watch for a module variable using the syntax module::variable.

• 不太确定您是否可以轻松地观察具有这种语法的派生类型.
• 如果 variable 是一个(例如 2d)数组，您可以使用通常的 Fortran 索引(如 module::variable(12,457)
)单独访问其元素
• 可以通过 VS Code 的调试控制台"中的 gdb 查询访问数组的多个元素.使用-exec前缀传递gdb指令，如:-exec p module::variable@100显示module::variable<的前100个元素/code>.
• 手表"中可以显示多个元素面板通过指定起始索引如下:module::variable(1,1)@100.

• Not quite sure whether you can easily watch for derived types with such a syntax.
• if variable is an (e.g. 2d) array, you can access to its elements individualy with usual fortran indexing like module::variable(12,457)
• Multiple elements of an array can be accessed via gdb queries in VS Code's "debug console". Use -exec prefix to pass gdb instructions, such as: -exec p module::variable@100 to display the 100 first elements of module::variable.
• Multiple elements can be displayed in the "watch" panel by specifying a starting index as follows: module::variable(1,1)@100.

有用的来源:https://numericalnoob.blogspot.com/2012/08/fortran-allocatable-arrays-and-pointers.html和 https://www.gnu.org/software/gdb/documentation/当然.

Useful sources: https://numericalnoob.blogspot.com/2012/08/fortran-allocatable-arrays-and-pointers.html and https://www.gnu.org/software/gdb/documentation/ of course.

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