Non-functional requirements I got this outline from this website. Check it out to see it in more detail. Once outlined, the SRS is ready to be written.
Introduction — What is a pass?
Passes perform the transformations and optimizations that make up the compiler, they build the analysis results that are used by these transformations, and they are, above all, a structuring technique for compiler code.
All LLVM passes are subclasses of the Pass class, which implement functionality by overriding virtual methods inherited from Pass.
One of the main features of the LLVM Pass Framework is that it schedules passes to run in an efficient way based on the constraints that your pass meets which are indicated by which class they derive from. We start by showing you how to construct a pass, everything from setting up the code, to compiling, loading, and executing it.
After the basics are down, more advanced features are discussed. It does not modify the program at all, it just inspects it. Next, you need to create a new directory somewhere in the LLVM source base.
Finally, you must set up a build script that will compile the source code for the new pass. To do this, copy the following into CMakeLists.
This build script specifies that Hello. If your operating system uses a suffix other than. Now that we have the build scripts set up, we just need to write the code for the pass itself.
Now that we have a way to compile our new pass, we just have to write it. It makes the things declared inside of the anonymous namespace visible only to the current file.
Next, we declare our pass itself: The different builtin pass subclasses are described in detail laterbut for now, know that FunctionPass operates on a function at a time.
This is where we are supposed to do our thing, so we just print out our message with the name of each function. The last two arguments describe its behavior: As a whole, the. Note that everything in this file is contained in an anonymous namespace — this reflects the fact that passes are self contained units that do not need external interfaces although they can have them to be useful.
Because you registered your pass with RegisterPass, you will be able to use the opt tool to access it, once loaded. We can now run the bitcode file hello. To see what happened to the other string you registered, try running opt with the -help option: The pass name gets added as the information string for your pass, giving some documentation to users of opt.
Now that you have a working pass, you would go ahead and make it do the cool transformations you want. Once you get it all working and tested, it may become useful to find out how fast your pass is. The PassManager provides a nice command line option --time-passes that allows you to get information about the execution time of your pass along with the other passes you queue up.
Pass execution timing report Now that you have seen the basics of the mechanics behind passes, we can talk about some more details of how they work and how to use them. The Hello World example uses the FunctionPass class for its implementation, but we did not discuss why or when this should occur.
Here we talk about the classes available, from the most general to the most specific. When choosing a superclass for your Pass, you should choose the most specific class possible, while still being able to meet the requirements listed.
This pass type is used for passes that do not have to be run, do not change state, and never need to be updated.
This is not a normal type of transformation or analysis, but can provide information about the current compiler configuration. Although this pass class is very infrequently used, it is important for providing information about the current target machine being compiled for, and other static information that can affect the various transformations.
Deriving from ModulePass indicates that your pass uses the entire program as a unit, referring to function bodies in no predictable order, or adding and removing functions. Because nothing is known about the behavior of ModulePass subclasses, no optimization can be done for their execution.
A module pass can use function level passes e. Note that this can only be done for functions for which the analysis ran, e. To write a correct ModulePass subclass, derive from ModulePass and overload the runOnModule method with the following signature: It should return true if the module was modified by the transformation and false otherwise.
They can add and remove functions, get pointers to functions, etc. The doInitialization method is designed to do simple initialization type of stuff that does not depend on the SCCs being processed. The doInitialization method call is not scheduled to overlap with any other pass executions thus it should be very fast.Quick Start — Writing hello world ¶.
Here we describe how to write the “hello world” of passes. The “Hello” pass is designed to simply print out the name of non . Organize business requirements into logical groupings. Complete the BRD template with objectives, project perspectives, requirements and ancillary information.
Validate the information with subject matter experts (SMEs) and stakeholders. Send the draft out for review. Edit the BRD based on feedback.
Welcome to CPARS. CPARS hosts a suite of web-enabled applications that are used to document contractor and grantee performance information that is required by Federal Regulations. This MRD template is a work of fiction, but may provide good ideas or a few chuckles to product folks.
As of this writing, they include: Buffer over-write on messages > TB.
Memory leak causing required reboot of core service every 88 hours. Truncated header data on Type II EDI lookups. sample Marketing Requirements Document. Acknowledgements.
The contributions to early versions of this manual by Saikat DebRoy (who wrote the first draft of a guide to initiativeblog.com initiativeblog.comal) and Adrian Trapletti (who provided information on the C++ interface) are gratefully acknowledged.
Preparing technical requirement documents (also known as product requirement documents) is a typical part of any project to create or revise a software system, or other types of tangible products. There are many benefits of investing time and effort into preparing a technical requirement document.