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<strong>Tornado</strong> 2.0 User’s Guide this is the same thing as the button. But if there is a function call, the button executes that function in its entirety, then stops at the line after the function call. The display style has the same effect as with the button: thus, the button steps to either the next machine instruction or the next source statement, if necessary completing a subroutine call first. Continues program execution. Click this button to return control to the task you are debugging, rather than operating it manually from the debugger after a suspension. If there are no remaining breakpoints, interrupts, or signals, the task runs to completion. To continue only until the program reaches a particular line in your program, drag this icon (using the middle mouse button) from the button bar to the line in the display panel where the program is to suspend once more. This has the same effect as dragging the context pointer, but is more convenient when you scroll the program-display window away from the current point of suspension. This button issues the continue command. Finishes the current subroutine. While stepping through a program, you may conclude that the problem you are interested in lies in the current subroutine’s caller, rather than at the stack level where your task is suspended. Use this button in that situation: execution will continue until the current subroutine completes, then return control to the debugger in the calling statement. This button issues the finish command. Moves one level up the subroutine stack. The debugger usually has the same point of view as the executing program: in particular, what variable definitions are visible depends on the current subroutine. This button changes the context to the current subroutine’s caller; press it again to get to that subroutine’s caller, and so on. This button does not change the location of the program counter; it only affects what data and symbols are visible to you. If you continue or step the program, it still takes up where it left off, regardless of whether you have used this button. This button issues the up command, and has the same effect on a following finish or until command as up. The location of the temporary breakpoint that is set for finish or until depends on the selected frame, which is changed by up. 248
7 Debugger Moves one level down the stack. This is the converse of the button, and like it, affects the data you can see but not the state of your program. This button issues the down command, and has the same effect on a following finish or until command as down. The location of the temporary breakpoint that is set for finish or until depends on the selected frame, which is changed by down. Calls up an editor (specified by your EDITOR environment variable—or vi if EDITOR is not defined) on the current source file. To specify the starting context, drag the editor button to a line in the region you wish to edit, using the middle button on your mouse. Prints a symbol’s value in the command panel. Begin by left-clicking on the symbol of interest, in the program-display panel; the debugger highlights the symbol. Then press this button to display its value. This button issues the print command, and echoes the command and its output—the symbol value—to the command panel. Prints the value at a pointer location. This button has a similar effect to the print button above, except that it de-references the selected symbol. Use this button to inspect data when you have a pointer to the data, rather than the data itself. This button issues the print * command, and echoes the command and its output—the value at the selected pointer location—to the command panel. Launches an inspection window that monitors a symbol’s current value. This auxiliary display is automatically updated each time control returns to the debugger. Several different kinds of data-inspection windows are available, depending on data structure; the debugger chooses the right one automatically. Figure 7-11 shows the two simplest displays: for ordinary numeric data, and for a pointer. In both cases, the numeric value of the variable is displayed in a small independent window. The name of the variable being displayed appears next to the numeric value. The window’s title bar also shows the name of the variable displayed, preceded by a parenthesized display number. 2 7 The debugger indicates whether the displayed variable is a pointer, by placing an asterisk to its left (as with pNode in Figure 7-11). To follow a 249
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C Tornado Tools Reference EXAMPLE R
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E X Resources E.1 Predefined X Reso
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Index creating 100 linking 103 open
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Index info command (CrossWind) 258
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Index unreserved 82 virtual console
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