YafetBeyene fda24dbc16 [BOLT] Add dump-dot-func option for selective function CFG dumping (#153007) ...

## Change:
* Added `--dump-dot-func` command-line option that allows users to dump
CFGs only for specific functions instead of dumping all functions (the
current only available option being `--dump-dot-all`)

## Usage:
* Users can now specify function names or regex patterns (e.g.,
`--dump-dot-func=main,helper` or `--dump-dot-func="init.*`") to generate
.dot files only for functions of interest
* Aims to save time when analysing specific functions in large binaries
(e.g., only dumping graphs for performance-critical functions identified
through profiling) and we can now avoid reduce output clutter from
generating thousands of unnecessary .dot files when analysing large
binaries

## Testing
The introduced test `dump-dot-func.test` confirms the new option does
the following:

- [x] 1. `dump-dot-func` can correctly filter a specified functions
- [x] 2. Can achieve the above with regexes
- [x] 3. Can do 1. with a list of functions
- [x] No option specified creates no dot files
- [x] Passing in a non-existent function generates no dumping messages
- [x] `dump-dot-all` continues to work as expected

2025-08-22 10:51:09 +01:00

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