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Docs: suggest checking MM, mention virtualenv, clarify about expected/

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cadmic 2024-01-24 18:01:42 -08:00
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docs/retail_versions.md
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@ -8,19 +8,24 @@ different compiler flags. However, once this version is done, future
retail versions should be much easier, as the changes between retail versions are
small in comparison.
Instead of comparing against a matching build, the target ROM is disassembled
and recompiled as relocatable `.o` files directly into `expected/build/gc-eu-mq`
for diff tools. This allows us to make progress matching code in parallel with
solving other problems (such as the build system, ROM organization, and BSS
ordering). The files in `tools/disasm/gc-eu-mq` say how to split the source
files and where the functions and variables are in the target ROM, and these may
need to be updated if there are mistakes or if function names change due to
documentation work.
Instead of `cp`ing a matching build into `expected/`, the target ROM is
recompiled as `.o` files directly into `expected/build/gc-eu-mq` for diff tools.
This allows us to make progress matching code in parallel with solving other
problems (such as the build system, ROM organization, and BSS ordering). The
files in `tools/disasm/gc-eu-mq` say how to split the source files and where the
functions and variables are in the target ROM, and these may need to be updated
if there are mistakes or if function names change due to documentation work.
Unfortunately, the disassembly is not perfect, so a "correct" decompilation might
still show diffs with data symbols. We might improve this later, but these data
diffs are fine to ignore for now.
For register and stack allocation differences, often the code can be tweaked so
that it matches both the retail ROM while continuing to match the Debug ROM (for
example, by reordering assignments or moving a local variable declaration inside
an `if` block). Since retail MM versions use the same compiler flags as retail
OOT, checking MM decomp for similar code can help.
We can disable code that was removed in retail builds by adding
`#ifdef OOT_DEBUG` around these parts of the code. In order too keep the code
readable, we should try to minimize the amount of `#ifdef` noise whenever
@ -115,6 +120,13 @@ void foo() {
## Diff Tools
Note that many tools will require activating the Python virtual environment
in your terminal session. To do this, run:
```sh
source .venv/bin/activate
```
### retail_progress.py
Running `./retail_progress.py file.c` will attempt to figure out which functions