Oracle® Developer Studio 12.6: Debugging a Program with dbx

Language:

Oracle^® Developer Studio 12.6: Debugging a Program with dbx

June 2017

Describes how to use the dbx command-line debugger, an interactive source level debugging tool and is intended for programmers who want to debug an application using the dbx command-line debugging tool. A working knowledge of Fortran, C, C++, or Java and some understanding of the Oracle Solaris operating system, or the Linux operating system, and UNIX commands is required.

Document Information
Using This Documentation
- Product Documentation Library
- Feedback
1 Getting Started With dbx
- Compiling Your Code for Debugging
- Starting dbx or dbxtool and Loading Your Program
- Running Your Program in dbx
- Debugging Your Program With dbx
- Quitting dbx
- Accessing dbx Online Help
2 Starting dbx
- Starting a Debugging Session
- Debugging a Core File
- Using the Process ID
- dbx Startup Sequence
- Setting Startup Properties
- Compiling a Program for Debugging
- Debugging Optimized Code
- Quitting Debugging
- Saving and Restoring a Debugging Run
3 Customizing dbx
- Using the dbx Initialization File
  - Creating a .dbxrc File
  - Initialization File Sample
- Setting dbxenv Variables
- dbxenv Variables and the Korn Shell
4 Viewing and Navigating To Code
- Navigating To Code
- Types of Program Locations
- Program Scope
  - Variables That Reflect the Current Scope
  - Visiting Scope
    - Components of the Visiting Scope
    - Changing the Visiting Scope
- Qualifying Symbols With Scope Resolution Operators
- Locating Symbols
- Viewing Variables, Members, Types, and Classes
  - Looking Up Definitions of Variables, Members, and Functions
  - Looking Up Definitions of Types and Classes
- Debugging Information in Object Files and Executables
- Finding Source and Object Files
5 Controlling Program Execution
- Running a Program
- Attaching dbx to a Running Process
- Detaching dbx From a Process
- Stepping Through a Program
- Using Ctrl+C to Stop a Process
- Event Management
6 Setting Breakpoints and Traces
- Setting Breakpoints
- Setting Filters on Breakpoints
- Tracing Execution
- Executing dbx Commands at a Line
- Setting Breakpoints in Dynamically Loaded Libraries
- Listing and Deleting Breakpoints
  - Listing Breakpoints and Traces
  - Deleting Specific Breakpoints Using Handler ID Numbers
- Enabling and Disabling Breakpoints
- Efficiency Considerations
7 Using the Call Stack
- Finding Your Place on the Stack
- Walking the Stack and Returning Home
- Moving Up and Down the Stack
- Popping the Call Stack
- Hiding Stack Frames
- Displaying and Reading a Stack Trace
8 Evaluating and Displaying Data
- Evaluating Variables and Expressions
- Assigning a Value to a Variable
- Evaluating Arrays
- Using Pretty-Printing
9 Using Runtime Checking
- Capabilities of Runtime Checking
  - When to Use Runtime Checking
  - Runtime Checking Requirements
- Using Runtime Checking
- Using Access Checking
  - Understanding the Memory Access Error Report
  - Memory Access Errors
- Using Memory Leak Checking
- Using Memory Use Checking
- Suppressing Errors
- Using Runtime Checking on a Child Process
- Using Runtime Checking on an Attached Process
  - Attached Process on a System Running Oracle Solaris
  - Attached Process on a System Running Linux
- Using Fix and Continue With Runtime Checking
- Runtime Checking Application Programming Interface
- Using Runtime Checking in Batch Mode
- Troubleshooting Tips
- Runtime Checking Limitations
- Runtime Checking Errors
  - Access Errors
  - Memory Leak Errors
10 Debugging Multithreaded Applications
- Understanding Multithreaded Debugging
- Understanding Thread Creation Activity
- Understanding LWP Information
11 Debugging Child Processes
- Attaching to Child Processes
- Following the exec Function
- Following the fork Function
- Interacting With Events
12 Debugging OpenMP Programs
- How Compilers Transform OpenMP Code
- dbx Functionality Available for OpenMP Code
- Execution Sequence of OpenMP Code
13 Working With Signals
- Understanding Signal Events
- Catching Signals
  - Changing the Default Signal Lists
  - Trapping the FPE Signal (Oracle Solaris Only)
    - Determining Where the Exception Occurred
    - Determining the Cause of the Exception
- Sending a Signal to a Program
- Automatically Handling Signals
14 Debugging C++ With dbx
- Using dbx With C++
- Exception Handling in dbx
  - Commands for Handling Exceptions
  - Examples of Exception Handling
- Debugging With C++ Templates
  - Template Example
  - Commands for C++ Templates
15 Debugging Fortran Using dbx
- Debugging Fortran
- Debugging Segmentation Faults
  - Using dbx to Locate Problems
- Locating Exceptions
- Tracing Calls
- Working With Arrays
  - Fortran Allocatable Arrays
- Showing Intrinsic Functions
- Showing Complex Expressions
- Showing Interval Expressions
- Showing Logical Operators
- Viewing Fortran Derived Types
- Pointer to Fortran Derived Type
- Object Oriented Fortran
- Allocatable Scalar Type
16 Debugging a Java Application With dbx
- Using dbx With Java Code
  - Capabilities of dbx With Java Code
  - Limitations of dbx With Java Code
- Environment Variables for Java Debugging
- Starting to Debug a Java Application
- Customizing Startup of the JVM Software
- dbx Modes for Debugging Java Code
  - Switching From Java or JNI Mode to Native Mode
  - Switching Modes When You Interrupt Execution
- Using dbx Commands in Java Mode
17 Debugging at the Machine-Instruction Level
- Using dbx at the Machine-Instruction Level
- Examining the Contents of Memory
- Stepping and Tracing at Machine-Instruction Level
  - Single-Stepping at the Machine-Instruction Level
  - Tracing at the Machine-Instruction Level
- Setting Breakpoints at the Machine-Instruction Level
  - Setting a Breakpoint at an Address
- Using the regs Command
  - Platform-Specific Registers
18 Using dbx With the Korn Shell
- ksh-88 Features Not Implemented
- Extensions to ksh-88
- Renamed Commands
- Rebinding of Editing Functions
19 Debugging Shared Libraries
- Dynamic Linker
- Setting Breakpoints in Shared Libraries
- Setting a Breakpoint in an Explicitly Loaded Library
Appendix A Modifying a Program State
- Impacts of Running a Program Under dbx
- Commands That Alter the State of the Program
Appendix B Event Management
- Event Handlers
- Creating Event Handlers
- Manipulating Event Handlers
- Using Event Counters
- Event Safety
- Setting Event Specifications
- Event Specification Modifiers
- Parsing and Ambiguity
- Using Predefined Variables
  - Variables Valid for when Command
    - $handlerid
  - Variables Valid for when Command and Specific Events
- Event Handler Examples
Appendix C Macros
- Additional Uses of Macro Expansion
- Macro Definitions
- Skimming Errors
- Using the pathmap Command to Improve Skimming
Appendix D Command Reference
- adi assign Command
  - Native Mode Syntax
- adi examine Command
  - Native Mode Syntax
- assign Command
  - Native Mode Syntax
  - Java Mode Syntax
- attach Command
  - Syntax
- bsearch Command
  - Syntax
- call Command
  - Native Mode Syntax
  - Java Mode Syntax
- cancel Command
- catch Command
  - Syntax
- check Command
  - Syntax
- clear Command
  - Syntax
- collector Command
  - Syntax
  - collector archive Command
    - Syntax
  - collector dbxsample Command
    - Syntax
  - collector disable Command
  - collector enable Command
  - collector heaptrace Command
    - Syntax
  - collector hwprofile Command
    - Syntax
  - collector limit Command
    - Syntax
  - collector pause Command
  - collector profile Command
    - Syntax
  - collector resume Command
  - collector sample Command
    - Syntax
  - collector show Command
    - Syntax
  - collector status Command
  - collector store Command
    - Syntax
  - collector synctrace Command
    - Syntax
  - collector tha Command
    - Syntax
  - collector version Command
    - Syntax
- cont Command
  - Syntax
- dalias Command
  - Syntax
- dbx Command
  - Native Mode Syntax
  - Java Mode Syntax
  - Options
- dbxenv Command
  - Syntax
- debug Command
  - Native Mode Syntax
  - Java Mode Syntax
  - Options
- delete Command
  - Syntax
- detach Command
  - Native Mode Syntax
  - Java Mode Syntax
- dis Command
  - Syntax
  - Options
- display Command
  - Native Mode Syntax
  - Java Mode Syntax
- down Command
  - Syntax
- dump Command
  - Syntax
- edit Command
  - Syntax
- examine Command
  - Syntax
- exception Command
  - Syntax
- exists Command
  - Syntax
- file Command
  - Syntax
- files Command
  - Native Mode Syntax
  - Java Mode Syntax
- fix Command
  - Syntax
- fixed Command
- fortran_modules Command
  - Syntax
- frame Command
  - Syntax
- func Command
  - Native Mode Syntax
  - Java Mode Syntax
- funcs Command
  - Syntax
- gdb Command
  - Syntax
- handler Command
  - Syntax
- hide Command
  - Syntax
- ignore Command
  - Syntax
- import Command
  - Syntax
- intercept Command
  - Syntax
- java Command
  - Syntax
- jclasses Command
  - Syntax
- joff Command
- jon Command
- jpkgs Command
- kill Command
  - Syntax
- language Command
  - Syntax
- line Command
  - Syntax
  - Examples
- list Command
  - Syntax
    - Options
    - Examples
- listi Command
- loadobject Command
  - Syntax
  - loadobject -dumpelf Command
    - Syntax
  - loadobject -exclude Command
    - Syntax
  - loadobject -hide Command
    - Syntax
  - loadobject -list Command
    - Syntax
  - loadobject -load Command
    - Syntax
  - loadobject -unload Command
    - Syntax
  - loadobject -use Command
    - Syntax
- lwp Command
  - Syntax
- lwps Command
- macro Command
  - Syntax
- mmapfile Command
  - Syntax
  - Example
- module Command
  - Syntax
- modules Command
  - Syntax
- native Command
  - Syntax
- next Command
  - Native Mode Syntax
  - Java Mode Syntax
- nexti Command
  - Syntax
- omp_loop Command
- omp_pr Command
  - Syntax
- omp_serialize Command
  - Syntax
- omp_team Command
  - Syntax
- omp_tr Command
  - Syntax
- pathmap Command
  - Syntax
  - Examples
- pop Command
  - Syntax
- print Command
  - Native Mode Syntax
  - Java Mode Syntax
- proc Command
  - Syntax
- prog Command
  - Syntax
- python-docs Command
  - Syntax
- quit Command
  - Syntax
- regs Command
  - Syntax
  - Example (SPARC platform)
- replay Command
  - Syntax
- rerun Command
  - Syntax
- restore Command
  - Syntax
- rprint Command
  - Syntax
- rtc showmap Command
- rtc skippatch Command
  - Syntax
- run Command
  - Native Mode Syntax
  - Java Mode Syntax
- runargs Command
  - Syntax
- save Command
  - Syntax
- scopes Command
- search Command
  - Syntax
- showblock Command
  - Syntax
- showleaks Command
  - Syntax
- showmemuse Command
  - Syntax
- source Command
  - Syntax
- status Command
  - Syntax
  - Example
- step Command
  - Native Mode Syntax
  - Java Mode Syntax
- stepi Command
  - Syntax
- stop Command
  - Syntax
    - Native Mode Syntax
    - Java Mode Syntax
- stopi Command
  - Syntax
- suppress Command
  - Syntax
- sync Command
  - Syntax
- syncs Command
- thread Command
  - Native Mode Syntax
  - Java Mode Syntax
- threads Command
  - Native Mode Syntax
  - Java Mode Syntax
- trace Command
  - Syntax
    - Native Mode Syntax
    - Java Mode Syntax
- tracei Command
  - Syntax
- uncheck Command
  - Syntax
- undisplay Command
  - Native Mode Syntax
  - Java Mode Syntax
- unhide Command
  - Syntax
- unintercept Command
  - Syntax
- unsuppress Command
  - Syntax
- unwatch Command
  - Syntax
- up Command
  - Syntax
- use Command
- watch Command
  - Syntax
- whatis Command
  - Native Mode Syntax
  - Java Mode Syntax
- when Command
  - Syntax
    - Native Mode Syntax
    - Java Mode Syntax
- wheni Command
  - Syntax
- where Command
  - Native Mode Syntax
  - Java Mode Syntax
- whereami Command
  - Syntax
- whereis Command
  - Syntax
- which Command
  - Syntax
- whocatches Command
  - Syntax
Index