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Auto merge of #16835 - wyatt-herkamp:use_one_tt_for_a_derive, r=Veykril

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Have Derive Attribute share a token tree with it's proc macros.

The goal of this PR is to stop creating a token tree for each derive proc macro.

This is done by giving the derive proc macros an id to its parent derive element.

From running the analysis stat on the rust analyzer project I did see a small memory decrease.

```
Inference:           42.80s, 362ginstr, 591mb
MIR lowering:        8.67s, 67ginstr, 291mb
Mir failed bodies: 18 (0%)
Data layouts:        85.81ms, 609minstr, 8mb
Failed data layouts: 135 (6%)
Const evaluation:    440.57ms, 5235minstr, 13mb
Failed const evals: 1 (0%)
Total:               64.16s, 552ginstr, 1731mb
```
After Change
```
Inference:           40.32s, 340ginstr, 593mb
MIR lowering:        7.95s, 62ginstr, 292mb
Mir failed bodies: 18 (0%)
Data layouts:        87.97ms, 591minstr, 8mb
Failed data layouts: 135 (6%)
Const evaluation:    433.38ms, 5226minstr, 14mb
Failed const evals: 1 (0%)
Total:               60.49s, 523ginstr, 1680mb
```

Currently this breaks the expansion for the actual derive attribute.

## TODO
- [x] Pick a better name for the function `smart_macro_arg`
This commit is contained in:
bors 2024-03-21 18:04:38 +00:00
commit 16c8deeb86
6 changed files with 80 additions and 32 deletions
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4
crates/hir/src/lib.rs
View file

@ -972,7 +972,7 @@ fn precise_macro_call_location(
MacroKind::ProcMacro,
)
}
MacroCallKind::Derive { ast_id, derive_attr_index, derive_index } => {
MacroCallKind::Derive { ast_id, derive_attr_index, derive_index, .. } => {
let node = ast_id.to_node(db.upcast());
// Compute the precise location of the macro name's token in the derive
// list.
@ -3708,7 +3708,7 @@ impl Impl {
let macro_file = src.file_id.macro_file()?;
let loc = macro_file.macro_call_id.lookup(db.upcast());
let (derive_attr, derive_index) = match loc.kind {
MacroCallKind::Derive { ast_id, derive_attr_index, derive_index } => {
MacroCallKind::Derive { ast_id, derive_attr_index, derive_index, .. } => {
let module_id = self.id.lookup(db.upcast()).container;
(
db.crate_def_map(module_id.krate())[module_id.local_id]