361 lines
10 KiB
Rust
361 lines
10 KiB
Rust
#![feature(
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rustc_private,
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decl_macro,
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type_alias_impl_trait,
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associated_type_bounds,
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never_type,
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try_blocks,
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hash_drain_filter,
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str_split_once
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)]
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#![warn(rust_2018_idioms)]
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#![warn(unused_lifetimes)]
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#![warn(unreachable_pub)]
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#[cfg(feature = "jit")]
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extern crate libc;
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extern crate snap;
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#[macro_use]
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extern crate rustc_middle;
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extern crate rustc_ast;
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extern crate rustc_codegen_ssa;
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extern crate rustc_data_structures;
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extern crate rustc_errors;
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extern crate rustc_fs_util;
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extern crate rustc_hir;
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extern crate rustc_incremental;
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extern crate rustc_index;
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extern crate rustc_session;
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extern crate rustc_span;
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extern crate rustc_symbol_mangling;
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extern crate rustc_target;
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// This prevents duplicating functions and statics that are already part of the host rustc process.
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#[allow(unused_extern_crates)]
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extern crate rustc_driver;
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use std::any::Any;
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use std::str::FromStr;
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use rustc_codegen_ssa::traits::CodegenBackend;
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use rustc_codegen_ssa::CodegenResults;
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use rustc_errors::ErrorReported;
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use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
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use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
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use rustc_middle::ty::query::Providers;
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use rustc_session::config::OutputFilenames;
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use rustc_session::Session;
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use cranelift_codegen::settings::{self, Configurable};
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use crate::constant::ConstantCx;
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use crate::prelude::*;
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mod abi;
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mod allocator;
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mod analyze;
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mod archive;
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mod atomic_shim;
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mod backend;
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mod base;
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mod cast;
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mod codegen_i128;
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mod common;
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mod constant;
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mod debuginfo;
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mod discriminant;
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mod driver;
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mod inline_asm;
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mod intrinsics;
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mod linkage;
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mod main_shim;
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mod metadata;
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mod num;
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mod optimize;
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mod pointer;
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mod pretty_clif;
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mod toolchain;
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mod trap;
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mod unsize;
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mod value_and_place;
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mod vtable;
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mod prelude {
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pub(crate) use std::convert::{TryFrom, TryInto};
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pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
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pub(crate) use rustc_span::Span;
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pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
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pub(crate) use rustc_middle::bug;
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pub(crate) use rustc_middle::mir::{self, *};
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pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
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pub(crate) use rustc_middle::ty::{
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self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
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};
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pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
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pub(crate) use rustc_data_structures::fx::FxHashMap;
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pub(crate) use rustc_index::vec::Idx;
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pub(crate) use cranelift_codegen::entity::EntitySet;
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pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
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pub(crate) use cranelift_codegen::ir::function::Function;
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pub(crate) use cranelift_codegen::ir::types;
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pub(crate) use cranelift_codegen::ir::{
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AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
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StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
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};
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pub(crate) use cranelift_codegen::isa::{self, CallConv};
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pub(crate) use cranelift_codegen::Context;
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pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
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pub(crate) use cranelift_module::{self, DataContext, DataId, FuncId, Linkage, Module};
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pub(crate) use crate::abi::*;
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pub(crate) use crate::base::{codegen_operand, codegen_place};
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pub(crate) use crate::cast::*;
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pub(crate) use crate::common::*;
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pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
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pub(crate) use crate::pointer::Pointer;
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pub(crate) use crate::trap::*;
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pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
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}
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struct PrintOnPanic<F: Fn() -> String>(F);
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impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
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fn drop(&mut self) {
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if ::std::thread::panicking() {
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println!("{}", (self.0)());
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}
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}
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}
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struct CodegenCx<'tcx, M: Module> {
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tcx: TyCtxt<'tcx>,
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module: M,
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global_asm: String,
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constants_cx: ConstantCx,
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cached_context: Context,
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vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
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debug_context: Option<DebugContext<'tcx>>,
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unwind_context: UnwindContext<'tcx>,
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}
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impl<'tcx, M: Module> CodegenCx<'tcx, M> {
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fn new(tcx: TyCtxt<'tcx>, module: M, debug_info: bool, pic_eh_frame: bool) -> Self {
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let unwind_context = UnwindContext::new(tcx, module.isa(), pic_eh_frame);
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let debug_context = if debug_info {
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Some(DebugContext::new(tcx, module.isa()))
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} else {
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None
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};
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CodegenCx {
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tcx,
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module,
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global_asm: String::new(),
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constants_cx: ConstantCx::default(),
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cached_context: Context::new(),
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vtables: FxHashMap::default(),
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debug_context,
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unwind_context,
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}
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}
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fn finalize(mut self) -> (M, String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
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self.constants_cx.finalize(self.tcx, &mut self.module);
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(
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self.module,
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self.global_asm,
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self.debug_context,
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self.unwind_context,
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)
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}
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}
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#[derive(Copy, Clone, Debug)]
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pub enum CodegenMode {
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Aot,
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Jit,
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JitLazy,
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}
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impl Default for CodegenMode {
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fn default() -> Self {
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CodegenMode::Aot
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}
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}
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impl FromStr for CodegenMode {
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type Err = String;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"aot" => Ok(CodegenMode::Aot),
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"jit" => Ok(CodegenMode::Jit),
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"jit-lazy" => Ok(CodegenMode::JitLazy),
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_ => Err(format!("Unknown codegen mode `{}`", s)),
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}
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}
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}
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#[derive(Copy, Clone, Debug, Default)]
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pub struct BackendConfig {
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pub codegen_mode: CodegenMode,
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}
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impl BackendConfig {
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fn from_opts(opts: &[String]) -> Result<Self, String> {
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let mut config = BackendConfig::default();
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for opt in opts {
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if let Some((name, value)) = opt.split_once('=') {
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match name {
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"mode" => config.codegen_mode = value.parse()?,
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_ => return Err(format!("Unknown option `{}`", name)),
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}
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} else {
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return Err(format!("Invalid option `{}`", opt));
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}
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}
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Ok(config)
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}
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}
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pub struct CraneliftCodegenBackend {
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pub config: Option<BackendConfig>,
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}
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impl CodegenBackend for CraneliftCodegenBackend {
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fn init(&self, sess: &Session) {
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if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
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sess.warn("LTO is not supported. You may get a linker error.");
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}
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}
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fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
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Box::new(crate::metadata::CraneliftMetadataLoader)
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}
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fn provide(&self, _providers: &mut Providers) {}
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fn provide_extern(&self, _providers: &mut Providers) {}
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fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
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vec![]
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}
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fn codegen_crate<'tcx>(
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&self,
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tcx: TyCtxt<'tcx>,
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metadata: EncodedMetadata,
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need_metadata_module: bool,
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) -> Box<dyn Any> {
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let config = if let Some(config) = self.config {
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config
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} else {
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BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args)
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.unwrap_or_else(|err| tcx.sess.fatal(&err))
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};
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let res = driver::codegen_crate(tcx, metadata, need_metadata_module, config);
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rustc_symbol_mangling::test::report_symbol_names(tcx);
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res
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}
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fn join_codegen(
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&self,
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ongoing_codegen: Box<dyn Any>,
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_sess: &Session,
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) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
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Ok(*ongoing_codegen
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.downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
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.unwrap())
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}
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fn link(
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&self,
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sess: &Session,
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codegen_results: CodegenResults,
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outputs: &OutputFilenames,
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) -> Result<(), ErrorReported> {
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use rustc_codegen_ssa::back::link::link_binary;
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let _timer = sess.prof.generic_activity("link_crate");
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sess.time("linking", || {
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let target_cpu = crate::target_triple(sess).to_string();
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link_binary::<crate::archive::ArArchiveBuilder<'_>>(
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sess,
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&codegen_results,
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outputs,
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&codegen_results.crate_name.as_str(),
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&target_cpu,
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);
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});
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Ok(())
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}
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}
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fn target_triple(sess: &Session) -> target_lexicon::Triple {
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sess.target.llvm_target.parse().unwrap()
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}
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fn build_isa(sess: &Session) -> Box<dyn isa::TargetIsa + 'static> {
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use target_lexicon::BinaryFormat;
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let target_triple = crate::target_triple(sess);
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let mut flags_builder = settings::builder();
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flags_builder.enable("is_pic").unwrap();
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flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
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flags_builder
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.set(
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"enable_verifier",
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if cfg!(debug_assertions) {
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"true"
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} else {
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"false"
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},
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)
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.unwrap();
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let tls_model = match target_triple.binary_format {
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BinaryFormat::Elf => "elf_gd",
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BinaryFormat::Macho => "macho",
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BinaryFormat::Coff => "coff",
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_ => "none",
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};
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flags_builder.set("tls_model", tls_model).unwrap();
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flags_builder.set("enable_simd", "true").unwrap();
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use rustc_session::config::OptLevel;
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match sess.opts.optimize {
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OptLevel::No => {
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flags_builder.set("opt_level", "none").unwrap();
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}
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OptLevel::Less | OptLevel::Default => {}
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OptLevel::Aggressive => {
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flags_builder.set("opt_level", "speed_and_size").unwrap();
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}
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OptLevel::Size | OptLevel::SizeMin => {
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sess.warn("Optimizing for size is not supported. Just ignoring the request");
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}
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}
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let flags = settings::Flags::new(flags_builder);
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let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
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// Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
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// is interpreted as `bsr`.
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isa_builder.enable("nehalem").unwrap();
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isa_builder.finish(flags)
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}
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/// This is the entrypoint for a hot plugged rustc_codegen_cranelift
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#[no_mangle]
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pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
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Box::new(CraneliftCodegenBackend { config: None })
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}
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