## Issue being fixed or feature implemented
Some headers include other heavy headers, such as `logging.h`,
`tinyformat.h`, `iostream`. These headers are heavy and increase
compilation time on scale of whole project drastically because can be
used in many other headers.
## What was done?
Moved many heavy includes from headers to cpp files to optimize
compilation time.
In some places added forward declarations if it is reasonable.
As side effect removed 2 circular dependencies:
```
"llmq/debug -> llmq/dkgsessionhandler -> llmq/debug"
"llmq/debug -> llmq/dkgsessionhandler -> llmq/dkgsession -> llmq/debug"
```
## How Has This Been Tested?
Run build 2 times before refactoring and after refactoring: `make clean
&& sleep 10s; time make -j18`
Before refactoring:
```
real 5m37,826s
user 77m12,075s
sys 6m20,547s
real 5m32,626s
user 76m51,143s
sys 6m24,511s
```
After refactoring:
```
real 5m18,509s
user 73m32,133s
sys 6m21,590s
real 5m14,466s
user 73m20,942s
sys 6m17,868s
```
~5% of improvement for compilation time. That's not huge, but that's
worth to get merged
There're several more refactorings TODO but better to do them later by
backports:
- bitcoin/bitcoin#27636
- bitcoin/bitcoin#26286
- bitcoin/bitcoin#27238
- and maybe this one: bitcoin/bitcoin#28200
## Breaking Changes
N/A
## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone
## Issue being fixed or feature implemented
Current implementation relies either on asserts or sometimes checks then
returning a special value; In the case of asserts (or no assert where we
use the value without checks) it'd be better to make it explicit to
function caller that the ptr must be not_null; otherwise gsl::not_null
will call terminate.
See
https://github.com/microsoft/GSL/blob/main/docs/headers.md#user-content-H-pointers-not_null
and
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rf-nullptr
I'm interested in a conceptual review; specifically on if this is
beneficial over just converting these ptrs to be a reference?
## What was done?
*Partial* implementation on using gsl::not_null in dash code
## How Has This Been Tested?
Building
## Breaking Changes
None
## Checklist:
_Go over all the following points, and put an `x` in all the boxes that
apply._
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone _(for repository
code-owners and collaborators only)_
---------
Signed-off-by: pasta <pasta@dashboost.org>
Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
