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     backend_config: crate::BackendConfig,
  21 ) -> Box<dyn Any> {
  22     tcx.sess.abort_if_errors();
  23
  24     match backend_config.codegen_mode {
  25         CodegenMode::Aot => aot::run_aot(tcx, backend_config, metadata, need_metadata_module),
  26         CodegenMode::Jit | CodegenMode::JitLazy => {
  27             let is_executable =
  28                 tcx.sess.crate_types().contains(&rustc_session::config::CrateType::Executable);
  29             if !is_executable {
  30                 tcx.sess.fatal("can't jit non-executable crate");
  31             }
  32
  33             #[cfg(feature = "jit")]
  34             let _: ! = jit::run_jit(tcx, backend_config);
  35
  36             #[cfg(not(feature = "jit"))]
  37             tcx.sess.fatal("jit support was disabled when compiling rustc_codegen_cranelift");
  38         }
  39     }
  40 }
  41
  42 fn predefine_mono_items<'tcx>(
  43     cx: &mut crate::CodegenCx<'_, 'tcx>,
  44     mono_items: &[(MonoItem<'tcx>, (RLinkage, Visibility))],
  45 ) {
  46     cx.tcx.sess.time("predefine functions", || {
  47         for &(mono_item, (linkage, visibility)) in mono_items {
  48             match mono_item {
  49                 MonoItem::Fn(instance) => {
  50                     let name = cx.tcx.symbol_name(instance).name.to_string();
  51                     let _inst_guard = crate::PrintOnPanic(|| format!("{:?} {}", instance, name));
  52                     let sig = get_function_sig(cx.tcx, cx.module.isa().triple(), instance);
  53                     let linkage = crate::linkage::get_clif_linkage(mono_item, linkage, visibility);
  54                     cx.module.declare_function(&name, linkage, &sig).unwrap();
  55                 }
  56                 MonoItem::Static(_) | MonoItem::GlobalAsm(_) => {}
  57             }
  58         }
  59     });
  60 }
  61
  62 fn time<R>(tcx: TyCtxt<'_>, name: &'static str, f: impl FnOnce() -> R) -> R {
  63     if std::env::var("CG_CLIF_DISPLAY_CG_TIME").as_ref().map(|val| &**val) == Ok("1") {
  64         println!("[{:<30}: {}] start", tcx.crate_name(LOCAL_CRATE), name);
  65         let before = std::time::Instant::now();
  66         let res = tcx.sess.time(name, f);
  67         let after = std::time::Instant::now();
  68         println!("[{:<30}: {}] end time: {:?}", tcx.crate_name(LOCAL_CRATE), name, after - before);
  69         res
  70     } else {
  71         tcx.sess.time(name, f)
  72     }
  73 }