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//! Target dependent parameters needed for layouts
use std::sync::Arc;
use base_db::CrateId;
use hir_def::layout::{Endian, Size, TargetDataLayout};
use crate::db::HirDatabase;
pub fn target_data_layout_query(db: &dyn HirDatabase, krate: CrateId) -> Arc<TargetDataLayout> {
let crate_graph = db.crate_graph();
let target_layout = &crate_graph[krate].target_layout;
let cfg_options = &crate_graph[krate].cfg_options;
Arc::new(
target_layout
.as_ref()
.and_then(|it| TargetDataLayout::parse_from_llvm_datalayout_string(it).ok())
.unwrap_or_else(|| {
let endian = match cfg_options.get_cfg_values("target_endian").next() {
Some(x) if x.as_str() == "big" => Endian::Big,
_ => Endian::Little,
};
let pointer_size = Size::from_bytes(
match cfg_options.get_cfg_values("target_pointer_width").next() {
Some(x) => match x.as_str() {
"16" => 2,
"32" => 4,
_ => 8,
},
_ => 8,
},
);
TargetDataLayout { endian, pointer_size, ..TargetDataLayout::default() }
}),
)
}
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