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5 Continuing execution after a breakpoint

When the execution has stopped at a breakpoint several commands allow the execution to be resumed:

You may use any of the GDB commands to resume an execution No distinction is made between Bigloo and C code. That is, it is possible when stepping a Bigloo function to enter a C function and vice versa. BDB does not try to hide the execution of C functions. Each code compiled in debug mode is visible from BDB.

continue [IGNORE-COUNT]
c [IGNORE-COUNT]

Resume program execution at the address where your program last stopped; any breakpoints set at that address are bypassed. The optional argument IGNORE-COUNT allows you to specify a further number of times to ignore a breakpoint at this location.

step [COUNT]
s [COUNT]

Continue running your program until control reaches a different Scheme source line, then stop it and return control to BDB. This command is abbreviated bs.

next [COUNT]
n [COUNT]

Continue to the next source line in the current (innermost) stack frame. This is similar to step, but function calls that appear within the line of code are executed without stopping. Execution stops when control reaches a different line of code at the original stack level that was executing when you gave the next command. This command is abbreviated n.

An argument COUNT is a repeat count, as for step.

The next command now only stops at the first instruction of a source line. This prevents the multiple stops that used to occur in switch statements, for loops, etc.

finish
f

Continue running until just after the function in the selected stack frame returns. Print the returned value (if any).

until
u

Continue running until a source line past the current line, in the current stack frame, is reached. This command is used to avoid single stepping through a loop more than once. It is like the next command, except that when until encounters a jump, it automatically continues execution until the program counter is greater than the address of the jump.

This means that when you reach the end of a loop after single stepping through it, until makes your program continue execution until it exits the loop. In contrast, a ‘next’ command at the end of a loop simply steps back to the beginning of the loop, which forces you to step through the next iteration.

until always stops your program if it attempts to exit the current stack frame.

return [EXPRESSION]
r [EXPRESSION]

You may return from a function, using the return GDB command

This cancels the execution of a function call. If you give an EXPRESSION argument, its value is used as the function’s return value.


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