Prism User's Guide - CSAIL People - MIT

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54 Prism User ~ Guide 5 4 - - - - - - -- ri s m U- G Breakpoints and traces are events. You can specify before the execution of a program begins what events are to take place during execution. When an event occurs: · The execution pointer moves to the current execution point. * A message is printed in the command window. · If you specified that an action was to accompany the event (for example, the printing of a variable's value), it is performed. * If the event is a trace, execution then continues. If it is a breakpoint, execution does not resume until you explicitly order it to (for example, by choosing Continue from the Execute menu). Prism provides various ways of creating these events - for example, by issuing commands, or by using the mouse in the source window. Section 4.3 describes how to create breakpoint events; Section 4.4 describes how to create trace events. Section 4.2 describes the event table, which provides a unified method for listing, creating, editing, and deleting events. You can define events so that they occur: * When the program reaches a certain point in its execution - for example, at a specified line or function. * When the value of a variable changes - for example, you can define an event that tells Prism to stop the program when z changes value. This kind of event is sometimes referred to as a watchpoint. It slows execution considerably, since Prism has to check the value of the variable after each -statement is executed. · At every line or assembly-language instruction. * Whenever a program is stopped- for example, you can define an event that tells Prism to print the value of z whenever the program stops. These are referred to as triggering conditions. In addition, you can qualify an event as follows: * So that it occurs only if a specified condition is met - for example, you can tell Prism to stop at line 25 if x is not equal to 1. Like watchpoints, this kind of event slows execution. Version 1.2, March 1993 Copyright 0 1993 Thinking Machines Corporation
Chapter 4 Debugging a Program 55 ~u1Ch 5 So that it occurs only after its triggering condition has been met a specified number of times - for example, you can tell Prism to stop the tenth time that the program reaches the function foo. You can include one or more Prism commands as actions that are to take place as part of the event. For example, using Prism commands, you can define an event that tells Prism to stop at line 25, print the value of x, and do a stack trace. 4.2 Using the Event Table The event table provides a unified method for controlling the execution of a program. Creating an event in any of the ways discussed later in this chapter adds an event to the list in this table. You can also display the event table and use it to: * add new events · delete existing events · edit existing events You display the event table by choosing the Event Table selection from the Events menu. This section describes the general process of using the event table. 4.2.1 Description of the Event Table Figure 14 shows the event table. The top area of the event table is the event list - a scrollable region in which events are listed. When you execute the program, Prism uses the events in this list to control execution. Each event is listed in a format in which you could type it as a command in the command window. It is prefaced by an ID number assigned by Prism. For example, in Figure 14, the events have been assigned the IDs 1 and 2. Version 1.2, March 1993 Copyright © 1993 Thinking Machines Corporation
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