* a small interactive bootstrap program or machine code debugger

Perhaps best known among these is one of the first computerized video games, Spacewar !, but among the list are the first text editor, word processor, interactive debugger, the first credible computer chess program, and some of the earliest computerized music.

In the CodeView debugger, it was sometimes used to break into the debugging during program execution.

This is accomplished by reverse engineering the compiled program code using a debugger such as SoftICE, OllyDbg, GDB, or MacsBug until the software cracker reaches the subroutine that contains the primary method of protecting the software ( or by disassembling an executable file with a program such as IDA ).

Also, program code is usually " stepped through " ( see Program animation ) using a symbolic debugger, and optimizing transformations, particularly those that reorder code, can make it difficult to relate the output code with the line numbers in the original source code.

A debugger or debugging tool is a computer program that is used to test and debug other programs ( the " target " program ).

When the program " crashes " or reaches a preset condition, the debugger typically shows the location in the original code if it is a source-level debugger or symbolic debugger, commonly now seen in integrated development environments.

Debugger front-ends are popular extensions to debugger engines that provide IDE integration, program animation, and visualization features.

For example if the main target program is written in COBOL but calls assembly language subroutines and PL / 1 subroutines, the debugger may have to dynamically switch modes to accommodate the changes in language as they occur.

* An instruction set that meets the Popek and Goldberg virtualization requirements makes it easier to write debugger software that runs on the same CPU as the software being debugged ; such a CPU can execute the inner loops of the program under test at full speed, and still remain under debugger control.

Any interactive debugger will include some way of viewing the disassembly of the program being debugged.

Development included a symbolic debugger for multi-tasking environments, a BBS communications program, and numerous utility programs.

Some software debuggers could take advantage of an HGC to run the main program on the colour monitor and the debugger on the HGC.

* Symbolic Application Debugging Environment, a source-level debugger for Apple Macintosh program developers

* debugging can be difficult if it is not possible to run the program in a debugger due to resource constraints.

A program which can report on its internal states and processes, in the simple sense of a debugger program, can certainly be written.

CodeView supported all program models, including TINY, SMALL, COMPACT, MEDIUM, LARGE and HUGE, with TINY ( DOS-based. COM files ) having their symbolic debugger information stored in a separate file, with all of the other. EXE formats containing the symbolic information directly inside the executable.

* Edit and continue support, enabling source code to be modified and recompiled on-the-fly without having to exit the current running program or restart the debugger ( 32 bit applications only ).

A program that is running in memory, that encounters a simple mistake, can be corrected without having to stop the current program or exit the debugger.

* MacsBug, low-level assembly / machine-level debugger

MacsBug is a low-level ( assembly language / machine-level ) debugger for pre-Mac OS X Macintosh operating systems.

MacsBug is an acronym for Motorola Advanced Computer Systems Debugger, as opposed to Macintosh debugger ( The Motorola 68000 Microprocessor is imprinted with the MACSS acronym ).

MacsBug is not installed by default with Mac OS, although every Macintosh since the Macintosh Plus includes a debugger in ROM known as MicroBug.

The presence of MacsBug is indicated at startup ; it is present if the user sees the text Debugger installed ( although, occasionally, this may indicate the presence of another piece of software loaded into the area of memory reserved for the debugger, instead ).

Third party alternatives to MacsBug included ICOM Simulations ' TMON which came with the Darin Adler Extended User Area & Trap Discipline ( allowing all documented Mac API parameters to be verified ) and the fully symbolic Jasik debugger, which was much more powerful, but harder to use due to the intricate and non-standard user interface.

It was modeled after the DBX debugger, which came with Berkeley Unix distributions.

Clang replaced the previous compiler ( with GCC optionally supported ), and GDB, the GNU debugger, was ported.

* a reasonable debugger ( its only significant drawback was that one could not examine the contents of fields in structures )

Vital-LISP, a considerably enhanced version of AutoLISP including an IDE, debugger and compiler, and ActiveX support, was developed and sold by third party developer Basis Software.

It had a pseudo-membrane keyboard ( an array of mechanical microswitches without keycaps, covered by flexible overlay ), 32 KiB RAM, 8 KiB ROM with BIOS ( chip K1801RE2-017 ), 8 KiB ROM with FOCAL interpreter ( K1801RE2-018 ), 8 KiB ROM with debugger ( K1801RE2-019 ) and one free ROM slot, and its CPU was clocked at 3 MHz.

The default ITS top-level command interpreter was the PDP-10 machine language debugger ( DDT ).

Dynamic Debugging Technique, or DDT, was the name of several debugger programs originally developed for DEC hardware, initially known as DEC Debugging Tape because it was distributed on paper tape.

In addition to its normal function as a debugger, DDT was also used as a top-level command shell for the MIT ITS operating system ; on some more recent ITS systems, it is replaced with a " PWORD " which implements a restricted subset of DDT's functionality.

Interlisp was notable for the integration of interactive development tools into the environment, such as a debugger, an automatic correction tool for simple errors ( DWIM-" do what I mean "), and analysis tools.

Xcode 4. 3. 2 was released on March 22, 2012 with enhancements to the iOS Simulator and a suggested move to the LLDB debugger as opposed to the GDB debugger ( which appear to be un-documented changes ).

The original version was developed by Motorola as a general debugger for its 68000 systems — it was ported to the Mac as a programmer's tool early in the project's development.

CodeView was a standalone debugger created by David Norris at Microsoft in 1985 as part of its development toolset.

In 1998, John Bandhauer was in charge of creating the Netscape 4x JavaScript debugger.

Drosera is a JavaScript debugger that was included with the nightly builds of WebKit.

Another notable change was the inclusion of a new IDE with builtin syntax highlighting, debugger, and project resource management.

In 1967 Knight wrote the original kernel for the ITS operating system, as well as the combination of command processor and debugger that was used as its top-level user interface.

The virtual machine was fully fault-tolerant, using structured exception handling internally, and provided a debugger interface.

The debugger was machine-level until quite late on, after which it also supported source-level access.

This same format was used to display memory when invoking the D command in the standard CP / M debugger DDT.

It was adapted from xdbx, which uses the dbx debugger.