Debugging with GDB (February 2008)
Table Of Contents
- Summary of GDB
- A Sample GDB Session
- Getting In and Out of GDB
- GDB Commands
- Running Programs Under GDB
- Stopping and Continuing
- Examining the Stack
- Examining Source Files
- Examining Data
- Using GDB with Different Languages
- Examining the Symbol Table
- Altering Execution
- GDB Files
- Specifying a Debugging Target
- HP-UX Configuration-Specific Information
- Summary of HP Enhancements to GDB
- HP-UX dependencies
- Supported Platforms and Modes
- HP-UX targets
- Support for Alternate root
- Specifying object file directories
- Fix and continue debugging
- Inline Support
- Debugging Macros
- Debugging Memory Problems
- When to suspect a memory leak
- Memory debugging restrictions
- Memory Debugging Methodologies
- Debugging Memory in Interactive Mode
- Debugging Memory in Batch Mode
- Debugging Memory Interactively After Attaching to a Running Process
- Configuring memory debugging settings
- Scenarios in memory debugging
- Stop when freeing unallocated or deallocated blocks
- Stop when freeing a block if bad writes occurred outside block boundary
- Stop when a specified block address is allocated or deallocated
- Scramble previous memory contents at malloc/free calls
- Detect dangling pointers and dangling blocks
- Detect in-block corruption of freed blocks
- Specify the amount of guard bytes for every block of allocated memory
- Comparison of Memory Debugging Commands in Interactive Mode and Batch Mode
- Heap Profiling
- Memory Checking Analysis for User Defined Memory Management Routines
- Commands to track the change in data segment value
- Thread Debugging Support
- Debugging MPI Programs
- Debugging multiple processes ( programs with fork and vfork calls)
- Debugging Core Files
- Printing the Execution Path Entries for the Current Frame or Thread
- Invoking GDB Before a Program Aborts
- Aborting a Command Line Call
- Instruction Level Stepping
- Enhanced support for watchpoints and breakpoints
- Debugging support for shared libraries
- Language support
- Enhanced Java Debugging Support
- Commands for Examining Java Virtual Machine(JVM) internals
- Support for stack traces in Java, C, and C++ programs
- Support for 64-bit Java, C, aC++ stack unwinding
- Enhanced support for C++ templates
- Support for __fpreg data type on IPF
- Support for _Complex variables in HP C
- Support for debugging namespaces
- Command for evaluating the address of an expression
- Viewing Wide Character Strings
- Support for output logging
- Getting information from a non-debug executable
- Debugging optimized code
- Visual Interface for WDB
- Starting and stopping Visual Interface for WDB
- Navigating the Visual Interface for WDB display
- Specifying foreground and background colors
- Using the X-window graphical interface
- Using the TUI mode
- Changing the size of the source or debugger pane
- Using commands to browse through source files
- Loading source files
- Editing source files
- Editing the command line and command-line history
- Saving the contents of a debugging session to a file
- Support for ddd
- Support for XDB commands
- GNU GDB Logging Commands
- Support for command line calls in a stripped executable
- Displaying the current block scope information
- Linux support
- The HP-UX Terminal User Interface
- XDB to WDB Transition Guide
- By-function lists of XDB commands and HP WDB equivalents
- Overall breakpoint commands
- XDB data formats and HP WDB equivalents
- XDB location syntax and HP WDB equivalents
- XDB special language operators and HP WDB equivalents
- XDB special variables and HP WDB equivalents
- XDB variable identifiers and HP WDB equivalents
- Alphabetical lists of XDB commands and HP WDB equivalents
- Controlling GDB
- Canned Sequences of Commands
- Using GDB under gnu Emacs
- GDB Annotations
- The gdb/mi Interface
- Function and purpose
- Notation and terminology
- gdb/mi Command Syntax
- gdb/mi compatibility with CLI
- gdb/mi output records
- gdb/mi command description format
- gdb/mi breakpoint table commands
- gdb/mi Data manipulation
- gdb/mi program control
- Miscellaneous GDB commands in gdb/mi
- gdb/mi Stack Manipulation Commands
- gdb/mi Symbol query commands
- gdb/mi Target Manipulation Commands
- gdb/mi thread commands
- gdb/mi tracepoint commands
- gdb/mi variable objects
- Reporting Bugs in GDB
- Installing GDB
- Index
126 Debugging with GDB
14.8.2 Inline Debugging in Integrity Systems
In Integrity systems, applications that are compiled with -g option support inline debug-
ging by default. Compiler versions A.06.02 and later support the inline debugging feature
in Integrity systems and require no additional options.
WDB 5.6 and later versions enable you to set and modify breakpoints in inline functions
for programs compiled with optimization level less than +O2. The breakpoint features for
inline functions are introduced as additional options in the set inline-debug command.
You can toggle the options for inline debugging by entering either of the following com-
mands:
(gdb) set inline-debug <option>
or
$ gdb --inline= <option>
The following options available for the set inline-debug command:
• on
• off
• inline_bp_all
• inline_bp_individual
The set inline-debug on command enables the inline debugging feature without the
inline breakpoints options in Integrity systems. This command is enabled by default.
The set inline-debug off command disables the inline debugging feature. You can
disable inline debugging by entering this command before attaching the debugger to the
application.
The set inline-debug inline_bp_all command enables you to set and modify break-
points on all instances of a particular inline function. It also enables the inline debugging
feature. A single instance of the specified inline function is displayed as a representative in-
stance for all the instances of the specified inline function. This creates a single-breakpoint
illusion for multiple instances of the inline function. You can set and modify breakpoints
on all the instances of the inline functions by setting and modifying breakpoints on the
displayed instance of the inline function. You must enter this command before attaching
the debugger to the application.
The set inline-debug inline_bp_individual command enables you to set and mod-
ify breakpoints on a specific instance of an inline function. It also enables the inline debug-
ging feature. All instances of the inline function are displayed separately with individual
breakpoint occurrences. You can set or delete individual breakpoints on a specific instance
of an inline function without modifying the breakpoints on other instances of the inline
function. You must enter this command before attaching the debugger to the application.
Limitations:
• The inline breakpoint features are not available for programs that are com-
piled with +O2 optimization level and above.