[llvm-dev] Refactor BitcodeWriter into classes?

[Duncan P. N. Exon Smith via llvm-dev]

> On 2016-Apr-21, at 11:41, Mehdi Amini <mehdi.amini at apple.com> wrote:
> 
> 
>> On Apr 21, 2016, at 11:25 AM, Teresa Johnson <tejohnson at google.com> wrote:
>> 
>> I am currently making some BitcodeWriter changes that involve some refactoring, and am thinking for the Nth time that it would be much nicer to have a class instead of passing around a long list of parameters. I am thinking of biting the bullet and doing that - any objections? 
> 
> In general I'm worried about having single gigantic class that keep many data members, this goes against https://en.wikipedia.org/wiki/Single_responsibility_principle and makes it hard to track what is initialized, where, and under which condition (basically one of the reason why global variables are not welcome). The code is almost always easier to understand with small separated components (yes many places are drifting a lot in LLVM...).
> 
> Not to say that it can't be done, just that it requires a lot of care.

I don't think we should throw *all* the state in.  But some of the state
is passed everywhere.

At least (off the top of my head):

  - ValueEnumerator&
  - BitstreamWriter&