Fortran 简明教程

Fortran - Debugging Program

调试工具用于在程序中搜索错误。

A debugger tool is used to search for errors in the programs.

调试程序逐步执行代码，并允许您在程序执行期间检查变量和其他数据对象中的值。

A debugger program steps through the code and allows you to examine the values in the variables and other data objects during execution of the program.

它加载源代码，您需要在调试器中运行该程序。调试器通过以下方式调试程序：

It loads the source code and you are supposed to run the program within the debugger. Debuggers debug a program by −

  1. Setting breakpoints,

  2. Stepping through the source code,

  3. Setting watch points.

断点指定程序应停止的位置，尤其是在关键代码行之后。程序执行会在断点处检查变量之后。

Breakpoints specify where the program should stop, specifically after a critical line of code. Program executions after the variables are checked at a breakpoint.

调试程序按行检查源代码。

Debugger programs also check the source code line by line.

监视点是需要检查某些变量的值的点，特别是在读或写操作之后。

Watch points are the points where the values of some variables are needed to be checked, particularly after a read or write operation.

The gdb Debugger

gdb 调试器，GNU 调试器随 Linux 操作系统提供。对于 X 窗口系统，gdb 带有一个图形界面，程序名为 xxgdb。

The gdb debugger, the GNU debugger comes with Linux operating system. For X windows system, gdb comes with a graphical interface and the program is named xxgdb.

下表提供了一些 gdb 中的命令−

Following table provides some commands in gdb −

Command

Purpose

break

Setting a breakpoint

run

Starts execution

cont

Continues execution

next

Executes only the next line of source code, without stepping into any function call

step

Execute the next line of source code by stepping into a function in case of a function call.

The dbx Debugger

Linux 中还有另一个调试器 dbx 调试器。

There is another debugger, the dbx debugger, for Linux.

下表提供了一些 dbx 中的命令 −

The following table provides some commands in dbx −

Command

Purpose

stop[var]

Sets a breakpoint when the value of variable var changes.

stop in [proc]

It stops execution when a procedure proc is entered

stop at [line]

It sets a breakpoint at a specified line.

run

Starts execution.

cont

Continues execution.

next

Executes only the next line of source code, without stepping into any function call.

step

Execute the next line of source code by stepping into a function in case of a function call.