diff options
Diffstat (limited to 'compiler/rustc_codegen_cranelift/src/lib.rs')
| -rw-r--r-- | compiler/rustc_codegen_cranelift/src/lib.rs | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs new file mode 100644 index 000000000..bb0793b1d --- /dev/null +++ b/compiler/rustc_codegen_cranelift/src/lib.rs @@ -0,0 +1,316 @@ +#![feature(rustc_private)] +// Note: please avoid adding other feature gates where possible +#![warn(rust_2018_idioms)] +#![warn(unused_lifetimes)] +#![warn(unreachable_pub)] + +#[macro_use] +extern crate rustc_middle; +extern crate rustc_ast; +extern crate rustc_codegen_ssa; +extern crate rustc_data_structures; +extern crate rustc_errors; +extern crate rustc_fs_util; +extern crate rustc_hir; +extern crate rustc_incremental; +extern crate rustc_index; +extern crate rustc_interface; +extern crate rustc_metadata; +extern crate rustc_session; +extern crate rustc_span; +extern crate rustc_target; + +// This prevents duplicating functions and statics that are already part of the host rustc process. +#[allow(unused_extern_crates)] +extern crate rustc_driver; + +use std::any::Any; +use std::cell::Cell; + +use rustc_codegen_ssa::traits::CodegenBackend; +use rustc_codegen_ssa::CodegenResults; +use rustc_errors::ErrorGuaranteed; +use rustc_metadata::EncodedMetadata; +use rustc_middle::dep_graph::{WorkProduct, WorkProductId}; +use rustc_session::config::OutputFilenames; +use rustc_session::Session; +use rustc_span::Symbol; + +use cranelift_codegen::isa::TargetIsa; +use cranelift_codegen::settings::{self, Configurable}; + +pub use crate::config::*; +use crate::prelude::*; + +mod abi; +mod allocator; +mod analyze; +mod archive; +mod base; +mod cast; +mod codegen_i128; +mod common; +mod compiler_builtins; +mod config; +mod constant; +mod debuginfo; +mod discriminant; +mod driver; +mod inline_asm; +mod intrinsics; +mod linkage; +mod main_shim; +mod num; +mod optimize; +mod pointer; +mod pretty_clif; +mod toolchain; +mod trap; +mod unsize; +mod value_and_place; +mod vtable; + +mod prelude { + pub(crate) use rustc_span::{FileNameDisplayPreference, Span}; + + pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE}; + pub(crate) use rustc_middle::bug; + pub(crate) use rustc_middle::mir::{self, *}; + pub(crate) use rustc_middle::ty::layout::{self, LayoutOf, TyAndLayout}; + pub(crate) use rustc_middle::ty::{ + self, FloatTy, Instance, InstanceDef, IntTy, ParamEnv, Ty, TyCtxt, TypeAndMut, + TypeFoldable, TypeVisitable, UintTy, + }; + pub(crate) use rustc_target::abi::{Abi, Scalar, Size, VariantIdx}; + + pub(crate) use rustc_data_structures::fx::FxHashMap; + + pub(crate) use rustc_index::vec::Idx; + + pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC}; + pub(crate) use cranelift_codegen::ir::function::Function; + pub(crate) use cranelift_codegen::ir::types; + pub(crate) use cranelift_codegen::ir::{ + AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc, + StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value, + }; + pub(crate) use cranelift_codegen::isa::{self, CallConv}; + pub(crate) use cranelift_codegen::Context; + pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable}; + pub(crate) use cranelift_module::{self, DataContext, FuncId, Linkage, Module}; + + pub(crate) use crate::abi::*; + pub(crate) use crate::base::{codegen_operand, codegen_place}; + pub(crate) use crate::cast::*; + pub(crate) use crate::common::*; + pub(crate) use crate::debuginfo::{DebugContext, UnwindContext}; + pub(crate) use crate::pointer::Pointer; + pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue}; +} + +struct PrintOnPanic<F: Fn() -> String>(F); +impl<F: Fn() -> String> Drop for PrintOnPanic<F> { + fn drop(&mut self) { + if ::std::thread::panicking() { + println!("{}", (self.0)()); + } + } +} + +/// The codegen context holds any information shared between the codegen of individual functions +/// inside a single codegen unit with the exception of the Cranelift [`Module`](cranelift_module::Module). +struct CodegenCx<'tcx> { + tcx: TyCtxt<'tcx>, + global_asm: String, + inline_asm_index: Cell<usize>, + cached_context: Context, + debug_context: Option<DebugContext<'tcx>>, + unwind_context: UnwindContext, + cgu_name: Symbol, +} + +impl<'tcx> CodegenCx<'tcx> { + fn new( + tcx: TyCtxt<'tcx>, + backend_config: BackendConfig, + isa: &dyn TargetIsa, + debug_info: bool, + cgu_name: Symbol, + ) -> Self { + assert_eq!(pointer_ty(tcx), isa.pointer_type()); + + let unwind_context = + UnwindContext::new(isa, matches!(backend_config.codegen_mode, CodegenMode::Aot)); + let debug_context = if debug_info && !tcx.sess.target.options.is_like_windows { + Some(DebugContext::new(tcx, isa)) + } else { + None + }; + CodegenCx { + tcx, + global_asm: String::new(), + inline_asm_index: Cell::new(0), + cached_context: Context::new(), + debug_context, + unwind_context, + cgu_name, + } + } +} + +pub struct CraneliftCodegenBackend { + pub config: Option<BackendConfig>, +} + +impl CodegenBackend for CraneliftCodegenBackend { + fn init(&self, sess: &Session) { + use rustc_session::config::Lto; + match sess.lto() { + Lto::No | Lto::ThinLocal => {} + Lto::Thin | Lto::Fat => sess.warn("LTO is not supported. You may get a linker error."), + } + } + + fn target_features(&self, _sess: &Session, _allow_unstable: bool) -> Vec<rustc_span::Symbol> { + vec![] + } + + fn print_version(&self) { + println!("Cranelift version: {}", cranelift_codegen::VERSION); + } + + fn codegen_crate( + &self, + tcx: TyCtxt<'_>, + metadata: EncodedMetadata, + need_metadata_module: bool, + ) -> Box<dyn Any> { + tcx.sess.abort_if_errors(); + let config = if let Some(config) = self.config.clone() { + config + } else { + if !tcx.sess.unstable_options() && !tcx.sess.opts.cg.llvm_args.is_empty() { + tcx.sess.fatal("`-Z unstable-options` must be passed to allow configuring cg_clif"); + } + BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args) + .unwrap_or_else(|err| tcx.sess.fatal(&err)) + }; + match config.codegen_mode { + CodegenMode::Aot => driver::aot::run_aot(tcx, config, metadata, need_metadata_module), + CodegenMode::Jit | CodegenMode::JitLazy => { + #[cfg(feature = "jit")] + driver::jit::run_jit(tcx, config); + + #[cfg(not(feature = "jit"))] + tcx.sess.fatal("jit support was disabled when compiling rustc_codegen_cranelift"); + } + } + } + + fn join_codegen( + &self, + ongoing_codegen: Box<dyn Any>, + _sess: &Session, + _outputs: &OutputFilenames, + ) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorGuaranteed> { + Ok(*ongoing_codegen + .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>() + .unwrap()) + } + + fn link( + &self, + sess: &Session, + codegen_results: CodegenResults, + outputs: &OutputFilenames, + ) -> Result<(), ErrorGuaranteed> { + use rustc_codegen_ssa::back::link::link_binary; + + link_binary(sess, &crate::archive::ArArchiveBuilderBuilder, &codegen_results, outputs) + } +} + +fn target_triple(sess: &Session) -> target_lexicon::Triple { + match sess.target.llvm_target.parse() { + Ok(triple) => triple, + Err(err) => sess.fatal(&format!("target not recognized: {}", err)), + } +} + +fn build_isa(sess: &Session, backend_config: &BackendConfig) -> Box<dyn isa::TargetIsa + 'static> { + use target_lexicon::BinaryFormat; + + let target_triple = crate::target_triple(sess); + + let mut flags_builder = settings::builder(); + flags_builder.enable("is_pic").unwrap(); + flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided + let enable_verifier = if backend_config.enable_verifier { "true" } else { "false" }; + flags_builder.set("enable_verifier", enable_verifier).unwrap(); + flags_builder.set("regalloc_checker", enable_verifier).unwrap(); + + let tls_model = match target_triple.binary_format { + BinaryFormat::Elf => "elf_gd", + BinaryFormat::Macho => "macho", + BinaryFormat::Coff => "coff", + _ => "none", + }; + flags_builder.set("tls_model", tls_model).unwrap(); + + flags_builder.set("enable_simd", "true").unwrap(); + + flags_builder.set("enable_llvm_abi_extensions", "true").unwrap(); + + use rustc_session::config::OptLevel; + match sess.opts.optimize { + OptLevel::No => { + flags_builder.set("opt_level", "none").unwrap(); + } + OptLevel::Less | OptLevel::Default => {} + OptLevel::Size | OptLevel::SizeMin | OptLevel::Aggressive => { + flags_builder.set("opt_level", "speed_and_size").unwrap(); + } + } + + let flags = settings::Flags::new(flags_builder); + + let isa_builder = match sess.opts.cg.target_cpu.as_deref() { + Some("native") => { + let builder = cranelift_native::builder_with_options(true).unwrap(); + builder + } + Some(value) => { + let mut builder = + cranelift_codegen::isa::lookup(target_triple.clone()).unwrap_or_else(|err| { + sess.fatal(&format!("can't compile for {}: {}", target_triple, err)); + }); + if let Err(_) = builder.enable(value) { + sess.fatal("the specified target cpu isn't currently supported by Cranelift."); + } + builder + } + None => { + let mut builder = + cranelift_codegen::isa::lookup(target_triple.clone()).unwrap_or_else(|err| { + sess.fatal(&format!("can't compile for {}: {}", target_triple, err)); + }); + if target_triple.architecture == target_lexicon::Architecture::X86_64 { + // Don't use "haswell" as the default, as it implies `has_lzcnt`. + // macOS CI is still at Ivy Bridge EP, so `lzcnt` is interpreted as `bsr`. + builder.enable("nehalem").unwrap(); + } + builder + } + }; + + match isa_builder.finish(flags) { + Ok(target_isa) => target_isa, + Err(err) => sess.fatal(&format!("failed to build TargetIsa: {}", err)), + } +} + +/// This is the entrypoint for a hot plugged rustc_codegen_cranelift +#[no_mangle] +pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> { + Box::new(CraneliftCodegenBackend { config: None }) +} |