compute-runtime/documentation/GUIDELINES.md

File to cover guidelines for NEO project.

# C++ usage

* use c++ style casts instead of c style casts.
* do not use default parameters
* prefer using over typedef
* avoid defines for constants, use constexpr
* prefer forward declarations in headers
* avoid includes in headers unless absolutely necessary
* use of exceptions in driver code needs strong justification
* prefer static create methods returning std::unique_ptr instead of throwing from constructor

# Naming conventions

* use camelCase for variables names
* prefer verbose variable names
```
bad examples : sld, elws, aws
good examples : sourceLevelDebugger, enqueuedLocalWorkGroupSize, actualWorkGroupSize
```
* follow givenWhenThen test naming pattern, indicate what is interesting in the test

bad examples :
```
TEST(CsrTests, initialize)
TEST(CQTests, simple)
TEST(CQTests, basic)
TEST(CQTests, works)
```
good examples:
```
TEST(CommandStreamReceiverTests, givenCommandStreamReceiverWhenItIsInitializedThenProperFieldsAreSet)
TEST(CommandQueueTests, givenCommandQueueWhenEnqueueIsDoneThenTaskLevelIsModifed)
TEST(CommandQueueTests, givenCommandQueueWithDefaultParamtersWhenEnqueueIsDoneThenTaskCountIncreases)
TEST(CommandQueueTests, givenCommandQueueWhenEnqueueWithBlockingFlagIsSetThenDriverWaitsUntilAllCommandsAreCompleted)
```
# Testing mindset

* Test behaviors instead of implementations, do not focus on adding a test per every function in the
class (avoid tests for setters and getters), focus on the functionality you are adding and how it changes
the driver behavior, do not bind tests to implementation.
* Make sure that test is fast, our test suite needs to complete in seconds for efficient development pace, as
a general rule test shouldn't be longer then 1ms in Debug driver.

# Coding guidelines
* HW commands and structures used in NEO must be initialized with constants defines for each Gfx Family: i.e. PIPE_CONTROL cmd = GfxFamily::cmdInitPipeControl
* Any new HW command or structure must have its own static constant initializer added to any Gfx Family that is going to use it.