Debugging Dynamic Memory Usage Errors Using HP WDB

Table 2 Compiler Options for Memory Debugging

DescriptionCompiler Option

The +check compiler options provide runtime checks to

detect out-of-bounds array references

(+check=bounds), memory leaks and heap corruption

(+check=malloc), writing outside the stack

frame(+check=stack), and un-initialized variables

(+check=uninit). The +check=all option enables

all the available runtime checks for the +check compiler

option.

A failed check results in the program abort at runtime.

The error message and the stack trace is printed to

stderr before the program terminates. The environment

variable RTC_NO_ABORT must be set to 1 to continue the

program execution after a failed runtime check. This

enables you to collect the diagnostics for all the failed

checks in a single execution run.

+check=

NOTE: The +check options must be specified at compile time and link time. If different +check

options are specified while compiling different source files, all the specified +check options are

needed at link time. Multiple +check options are interpreted from left to right with the options

on the right overriding earlier +check options.

For more information on the HP aC++ compiler options for memory debugging, see the HP aC++

World Wide Webpage at:

http://www.hp.com/go/cpp

For more information on the HP aC++ compiler options for memory debugging, see the HP C

World Wide Webpage at:

http://www.hp.com/go/c

Memory-Debugging Features of WDB

WDB supports the following memory-debugging features:

• Heap Profiling features

• Leak Profiling feature

• Error Injection features

• Event Monitoring features

In addition to these features, HP WDB provides the following generic commands for memory

debugging:

Table 3 Generic Commands for Memory Checking

DescriptionCommand

Toggles the setting of commands for detecting leaks,

bounds, double frees, and heap profiling.

set heap-check <on/off>

Displays the current settings for memory checking

show heap-check

Heap Profiling

You can profile the heap usage in an application by using WDB. The heap-profiling feature

enables you to analyze the influence of algorithms and data structures on heap usage and tune

the memory requirements of an application.