[Docs] Updated the content of getting started documentation under llvm/lib/MC

[pooja2299]

Summary

Wrote about llvm/lib/MC subproject on https://llvm.org/docs/GettingStarted.html page.

[pooja2299]

Updated changes in GettingStarted.rst

[xgupta]

LGTM, Thanks for the patch.

[xgupta]

I added @arsenm as the second reviewer, If he thinks the patch looks good, we will commit it.

[arsenm]

llvm/docs/GettingStarted.rst

887

Saying it translates implies it’s just the assembler and disassembler. It normally directly emits object files

[pooja2299]

Changed the statement that said 'translation of machine instruction, which suggested that it is just assembler or disassembler.

[pooja2299]

updated llvm/lib/MC section

[pooja2299]

@arsenm Plse review it now.

[arsenm]

llvm/docs/GettingStarted.rst

887

object and text?

[pooja2299]

I didn't understand, can u elaborate plse @arsenm . Does it produce text file as well? it helps in object code emission?

[arsenm]

In D101047#2712791, @pooja2299 wrote:

I didn't understand, can u elaborate plse @arsenm . Does it produce text file as well? it helps in object code emission?

It does both. It's everything related to the presentation and consumption of machine encoding, text and binary

[pooja2299]

In D101047#2712826, @arsenm wrote:

In D101047#2712791, @pooja2299 wrote:

I didn't understand, can u elaborate plse @arsenm . Does it produce text file as well? it helps in object code emission?

It does both. It's everything related to the presentation and consumption of machine encoding, text and binary

ok i will update this

[pooja2299]

some more changes to MC section

[pooja2299]

redited lib/MC section

[pooja2299]

@arsenm Can u please review the patch again and give your feedback?

[xgupta]

Assuming all comment addresses I will commit this patch on your behalf @pooja2299.

[arsenm]

llvm/docs/GettingStarted.rst

887

"It produces machine code object file" sounds grammatically off. files? This also stopped referencing the text assembly emission

[pooja2299]

Updated changes.

[pooja2299]

@arsenm should I change something else or is it fine?

[xgupta]

I think you can copy-paste from here https://llvm.org/docs/CodeGenerator.html#the-mc-layer.

Read a little about this layer under MCInst section here: https://eli.thegreenplace.net/2012/11/24/life-of-an-instruction-in-llvm
MC layer handles the object-file emission (it can also emit textual assembly files).

[xgupta]

I am really not an idol reviewer for this patch.

[pooja2299]

Updated with the suggested changes.

llvm/docs/GettingStarted.rst

``llvm/lib/IR/``
   Core LLVM source files that implement core classes like Instruction and
   BasicBlock.
 
 ``llvm/lib/AsmParser/``
 
   Source code for the LLVM assembly language parser library.
 
 ``llvm/lib/Bitcode/``
 
   Code for reading and writing bitcode.
 
 ``llvm/lib/Analysis/``
 
   A variety of program analyses, such as Call Graphs, Induction Variables,
   Natural Loop Identification, etc.
 
 ``llvm/lib/Transforms/``

 
 ``llvm/lib/CodeGen/``
 
   The major parts of the code generator: Instruction Selector, Instruction
   Scheduling, and Register Allocation.
 
 ``llvm/lib/MC/``
 
-  (FIXME: T.B.D.)  ....?
+  The libraries represent and process code at machine code level. Handles 
+  assembly and object-file emission. 
 
 ``llvm/lib/ExecutionEngine/``
 
   Libraries for directly executing bitcode at runtime in interpreted and
   JIT-compiled scenarios.
 
 ``llvm/lib/Support/``