src/tools/rust-analyzer/crates/hir-ty/src/layout/target.rs

   1 //! Target dependent parameters needed for layouts
   2
   3 use std::sync::Arc;
   4
   5 use base_db::CrateId;
   6 use hir_def::layout::{Endian, Size, TargetDataLayout};
   7
   8 use crate::db::HirDatabase;
   9
  10 pub fn target_data_layout_query(db: &dyn HirDatabase, krate: CrateId) -> Arc<TargetDataLayout> {
  11     let crate_graph = db.crate_graph();
  12     let target_layout = &crate_graph[krate].target_layout;
  13     let cfg_options = &crate_graph[krate].cfg_options;
  14     Arc::new(
  15         target_layout
  16             .as_ref()
  17             .and_then(|it| TargetDataLayout::parse_from_llvm_datalayout_string(it).ok())
  18             .unwrap_or_else(|| {
  19                 let endian = match cfg_options.get_cfg_values("target_endian").next() {
  20                     Some(x) if x.as_str() == "big" => Endian::Big,
  21                     _ => Endian::Little,
  22                 };
  23                 let pointer_size = Size::from_bytes(
  24                     match cfg_options.get_cfg_values("target_pointer_width").next() {
  25                         Some(x) => match x.as_str() {
  26                             "16" => 2,
  27                             "32" => 4,
  28                             _ => 8,
  29                         },
  30                         _ => 8,
  31                     },
  32                 );
  33                 TargetDataLayout { endian, pointer_size, ..TargetDataLayout::default() }
  34             }),
  35     )
  36 }