Prism User's Guide - CSAIL People - MIT

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66 Prism User s Guide 66 Prism Useri Guide 4.4 Tracing Program Execution You can trace program execution by using the event table or Events menu, or by issuing commands. All methods add an event to the event table. As described earlier, tracing is essentially the same as setting a breakpoint, except that execution continues automatically after the breakpoint is reached. When tracing source lines, Prism steps into procedures if they were compiled with the -g option; otherwise it steps over them as if it had issued a next command. (For CM Fortran programs, it steps into procedures unless they are in files compiled with the -nodebug option.) 4.4.1 Using the Event Table and the Events Menu To trace program execution, choose the Trace, Trace , or Trace selection from the Events menu. These choices are also available as Common Events buttons within the event table itself. · Trace displays source lines in the command window before they are executed. * Trace prompts for a source line. Prism displays a message immediately prior to the execution of this source line. * Trace prompts for a variable name. A message is printed when the variable's value changes. The variable can be an array, an array section, or a parallel variable, in which case a message is printed any time any element changes. This slows execution considerably. In addition, Trace is available as a Common Events button. It prompts for a condition, which can be any expression that evaluates to true or false; see Section 2.9 for more information on writing expressions. The program displays a message when the condition is met. This also slows execution considerably. For variations of these traces, you can create your own event in the event table. You can also use the Actions field to specify Prism commands that are to be executed along with the trace. Version 1.2, March 1993 Copyright © 1993 Thinking Machines Corporation
T, t ) Chapter 4. Debugging a Program 67 ~~*·~~~~R "- ~ -" · .".... , .. ,~ Deleting Traces via the Event Table To delete a trace, choose the Delete selection from the Events menu, or use the Delete button in the event table itself. See Section 4.2.3. 4.4.2 Using Commands Issue the trace command from the command line to trace program execution. Issuing trace with no arguments causes each source line in the program to be displayed in the command window before it is executed. The trace command uses the same syntax as the stop command; see Section 4.3.3. For example, trace print a) traces and prints a on every source line. trace at 17 if a .GT. 10 traces line 17 if a is greater than 10. In addition, Prism interprets trace line-number as being the same as trace at line-number For Machine Instructions To trace machine instructions, use the tracei command, specifying a machine address. When tracing machine instructions, Prism follows all procedure calls down. The tracei command has the same syntax as the stop command; see Section 4.3.3. The history region displays the address and the machine instruction. The execution pointer moves to the next source line to be executed. Version 1.2, March 1993 Copyright © 1993 Thinking Machines Corporation
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