compiler/rustc_codegen_cranelift/src/driver/mod.rs

   1 //! Drivers are responsible for calling [`codegen_mono_item`] and performing any further actions
   2 //! like JIT executing or writing object files.
   3
   4 use std::any::Any;
   5
   6 use rustc_middle::middle::cstore::EncodedMetadata;
   7 use rustc_middle::mir::mono::{Linkage as RLinkage, MonoItem, Visibility};
   8
   9 use crate::prelude::*;
  10 use crate::CodegenMode;
  11
  12 mod aot;
  13 #[cfg(feature = "jit")]
  14 mod jit;
  15
  16 pub(crate) fn codegen_crate(
  17     tcx: TyCtxt<'_>,
  18     metadata: EncodedMetadata,
  19     need_metadata_module: bool,
  20     config: crate::BackendConfig,
  21 ) -> Box<dyn Any> {
  22     tcx.sess.abort_if_errors();
  23
  24     match config.codegen_mode {
  25         CodegenMode::Aot => aot::run_aot(tcx, metadata, need_metadata_module),
  26         CodegenMode::Jit | CodegenMode::JitLazy => {
  27             let is_executable = tcx
  28                 .sess
  29                 .crate_types()
  30                 .contains(&rustc_session::config::CrateType::Executable);
  31             if !is_executable {
  32                 tcx.sess.fatal("can't jit non-executable crate");
  33             }
  34
  35             #[cfg(feature = "jit")]
  36             let _: ! = jit::run_jit(tcx, config.codegen_mode);
  37
  38             #[cfg(not(feature = "jit"))]
  39             tcx.sess
  40                 .fatal("jit support was disabled when compiling rustc_codegen_cranelift");
  41         }
  42     }
  43 }
  44
  45 fn predefine_mono_items<'tcx>(
  46     cx: &mut crate::CodegenCx<'tcx, impl Module>,
  47     mono_items: &[(MonoItem<'tcx>, (RLinkage, Visibility))],
  48 ) {
  49     cx.tcx.sess.time("predefine functions", || {
  50         for &(mono_item, (linkage, visibility)) in mono_items {
  51             match mono_item {
  52                 MonoItem::Fn(instance) => {
  53                     let (name, sig) = get_function_name_and_sig(
  54                         cx.tcx,
  55                         cx.module.isa().triple(),
  56                         instance,
  57                         false,
  58                     );
  59                     let linkage = crate::linkage::get_clif_linkage(mono_item, linkage, visibility);
  60                     cx.module.declare_function(&name, linkage, &sig).unwrap();
  61                 }
  62                 MonoItem::Static(_) | MonoItem::GlobalAsm(_) => {}
  63             }
  64         }
  65     });
  66 }
  67
  68 fn time<R>(tcx: TyCtxt<'_>, name: &'static str, f: impl FnOnce() -> R) -> R {
  69     if std::env::var("CG_CLIF_DISPLAY_CG_TIME")
  70         .as_ref()
  71         .map(|val| &**val)
  72         == Ok("1")
  73     {
  74         println!("[{:<30}: {}] start", tcx.crate_name(LOCAL_CRATE), name);
  75         let before = std::time::Instant::now();
  76         let res = tcx.sess.time(name, f);
  77         let after = std::time::Instant::now();
  78         println!(
  79             "[{:<30}: {}] end time: {:?}",
  80             tcx.crate_name(LOCAL_CRATE),
  81             name,
  82             after - before
  83         );
  84         res
  85     } else {
  86         tcx.sess.time(name, f)
  87     }
  88 }