1 files changed, 244 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
new file mode 100644
index 000000000..1802eedf1
--- /dev/null
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -0,0 +1,244 @@
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![feature(box_patterns)]
+#![feature(try_blocks)]
+#![feature(let_else)]
+#![feature(once_cell)]
+#![feature(associated_type_bounds)]
+#![feature(strict_provenance)]
+#![feature(int_roundings)]
+#![feature(if_let_guard)]
+#![recursion_limit = "256"]
+#![allow(rustc::potential_query_instability)]
+
+//! This crate contains codegen code that is used by all codegen backends (LLVM and others).
+//! The backend-agnostic functions of this crate use functions defined in various traits that
+//! have to be implemented by each backends.
+
+#[macro_use]
+extern crate rustc_macros;
+#[macro_use]
+extern crate tracing;
+#[macro_use]
+extern crate rustc_middle;
+
+use rustc_ast as ast;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::sync::Lrc;
+use rustc_hir::def_id::CrateNum;
+use rustc_hir::LangItem;
+use rustc_middle::dep_graph::WorkProduct;
+use rustc_middle::middle::dependency_format::Dependencies;
+use rustc_middle::middle::exported_symbols::SymbolExportKind;
+use rustc_middle::ty::query::{ExternProviders, Providers};
+use rustc_serialize::opaque::{MemDecoder, MemEncoder};
+use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
+use rustc_session::config::{CrateType, OutputFilenames, OutputType, RUST_CGU_EXT};
+use rustc_session::cstore::{self, CrateSource};
+use rustc_session::utils::NativeLibKind;
+use rustc_span::symbol::Symbol;
+use rustc_span::DebuggerVisualizerFile;
+use std::collections::BTreeSet;
+use std::path::{Path, PathBuf};
+
+pub mod back;
+pub mod base;
+pub mod common;
+pub mod coverageinfo;
+pub mod debuginfo;
+pub mod glue;
+pub mod meth;
+pub mod mir;
+pub mod mono_item;
+pub mod target_features;
+pub mod traits;
+
+pub struct ModuleCodegen<M> {
+    /// The name of the module. When the crate may be saved between
+    /// compilations, incremental compilation requires that name be
+    /// unique amongst **all** crates. Therefore, it should contain
+    /// something unique to this crate (e.g., a module path) as well
+    /// as the crate name and disambiguator.
+    /// We currently generate these names via CodegenUnit::build_cgu_name().
+    pub name: String,
+    pub module_llvm: M,
+    pub kind: ModuleKind,
+}
+
+impl<M> ModuleCodegen<M> {
+    pub fn into_compiled_module(
+        self,
+        emit_obj: bool,
+        emit_dwarf_obj: bool,
+        emit_bc: bool,
+        outputs: &OutputFilenames,
+    ) -> CompiledModule {
+        let object = emit_obj.then(|| outputs.temp_path(OutputType::Object, Some(&self.name)));
+        let dwarf_object = emit_dwarf_obj.then(|| outputs.temp_path_dwo(Some(&self.name)));
+        let bytecode = emit_bc.then(|| outputs.temp_path(OutputType::Bitcode, Some(&self.name)));
+
+        CompiledModule { name: self.name.clone(), kind: self.kind, object, dwarf_object, bytecode }
+    }
+}
+
+#[derive(Debug, Encodable, Decodable)]
+pub struct CompiledModule {
+    pub name: String,
+    pub kind: ModuleKind,
+    pub object: Option<PathBuf>,
+    pub dwarf_object: Option<PathBuf>,
+    pub bytecode: Option<PathBuf>,
+}
+
+pub struct CachedModuleCodegen {
+    pub name: String,
+    pub source: WorkProduct,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, Encodable, Decodable)]
+pub enum ModuleKind {
+    Regular,
+    Metadata,
+    Allocator,
+}
+
+bitflags::bitflags! {
+    pub struct MemFlags: u8 {
+        const VOLATILE = 1 << 0;
+        const NONTEMPORAL = 1 << 1;
+        const UNALIGNED = 1 << 2;
+    }
+}
+
+#[derive(Clone, Debug, Encodable, Decodable, HashStable)]
+pub struct NativeLib {
+    pub kind: NativeLibKind,
+    pub name: Option<Symbol>,
+    pub cfg: Option<ast::MetaItem>,
+    pub verbatim: Option<bool>,
+    pub dll_imports: Vec<cstore::DllImport>,
+}
+
+impl From<&cstore::NativeLib> for NativeLib {
+    fn from(lib: &cstore::NativeLib) -> Self {
+        NativeLib {
+            kind: lib.kind,
+            name: lib.name,
+            cfg: lib.cfg.clone(),
+            verbatim: lib.verbatim,
+            dll_imports: lib.dll_imports.clone(),
+        }
+    }
+}
+
+/// Misc info we load from metadata to persist beyond the tcx.
+///
+/// Note: though `CrateNum` is only meaningful within the same tcx, information within `CrateInfo`
+/// is self-contained. `CrateNum` can be viewed as a unique identifier within a `CrateInfo`, where
+/// `used_crate_source` contains all `CrateSource` of the dependents, and maintains a mapping from
+/// identifiers (`CrateNum`) to `CrateSource`. The other fields map `CrateNum` to the crate's own
+/// additional properties, so that effectively we can retrieve each dependent crate's `CrateSource`
+/// and the corresponding properties without referencing information outside of a `CrateInfo`.
+#[derive(Debug, Encodable, Decodable)]
+pub struct CrateInfo {
+    pub target_cpu: String,
+    pub exported_symbols: FxHashMap<CrateType, Vec<String>>,
+    pub linked_symbols: FxHashMap<CrateType, Vec<(String, SymbolExportKind)>>,
+    pub local_crate_name: Symbol,
+    pub compiler_builtins: Option<CrateNum>,
+    pub profiler_runtime: Option<CrateNum>,
+    pub is_no_builtins: FxHashSet<CrateNum>,
+    pub native_libraries: FxHashMap<CrateNum, Vec<NativeLib>>,
+    pub crate_name: FxHashMap<CrateNum, Symbol>,
+    pub used_libraries: Vec<NativeLib>,
+    pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
+    pub used_crates: Vec<CrateNum>,
+    pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>,
+    pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>,
+    pub dependency_formats: Lrc<Dependencies>,
+    pub windows_subsystem: Option<String>,
+    pub natvis_debugger_visualizers: BTreeSet<DebuggerVisualizerFile>,
+}
+
+#[derive(Encodable, Decodable)]
+pub struct CodegenResults {
+    pub modules: Vec<CompiledModule>,
+    pub allocator_module: Option<CompiledModule>,
+    pub metadata_module: Option<CompiledModule>,
+    pub metadata: rustc_metadata::EncodedMetadata,
+    pub crate_info: CrateInfo,
+}
+
+pub fn provide(providers: &mut Providers) {
+    crate::back::symbol_export::provide(providers);
+    crate::base::provide(providers);
+    crate::target_features::provide(providers);
+}
+
+pub fn provide_extern(providers: &mut ExternProviders) {
+    crate::back::symbol_export::provide_extern(providers);
+}
+
+/// Checks if the given filename ends with the `.rcgu.o` extension that `rustc`
+/// uses for the object files it generates.
+pub fn looks_like_rust_object_file(filename: &str) -> bool {
+    let path = Path::new(filename);
+    let ext = path.extension().and_then(|s| s.to_str());
+    if ext != Some(OutputType::Object.extension()) {
+        // The file name does not end with ".o", so it can't be an object file.
+        return false;
+    }
+
+    // Strip the ".o" at the end
+    let ext2 = path.file_stem().and_then(|s| Path::new(s).extension()).and_then(|s| s.to_str());
+
+    // Check if the "inner" extension
+    ext2 == Some(RUST_CGU_EXT)
+}
+
+const RLINK_VERSION: u32 = 1;
+const RLINK_MAGIC: &[u8] = b"rustlink";
+
+const RUSTC_VERSION: Option<&str> = option_env!("CFG_VERSION");
+
+impl CodegenResults {
+    pub fn serialize_rlink(codegen_results: &CodegenResults) -> Vec<u8> {
+        let mut encoder = MemEncoder::new();
+        encoder.emit_raw_bytes(RLINK_MAGIC);
+        // `emit_raw_bytes` is used to make sure that the version representation does not depend on
+        // Encoder's inner representation of `u32`.
+        encoder.emit_raw_bytes(&RLINK_VERSION.to_be_bytes());
+        encoder.emit_str(RUSTC_VERSION.unwrap());
+        Encodable::encode(codegen_results, &mut encoder);
+        encoder.finish()
+    }
+
+    pub fn deserialize_rlink(data: Vec<u8>) -> Result<Self, String> {
+        // The Decodable machinery is not used here because it panics if the input data is invalid
+        // and because its internal representation may change.
+        if !data.starts_with(RLINK_MAGIC) {
+            return Err("The input does not look like a .rlink file".to_string());
+        }
+        let data = &data[RLINK_MAGIC.len()..];
+        if data.len() < 4 {
+            return Err("The input does not contain version number".to_string());
+        }
+
+        let mut version_array: [u8; 4] = Default::default();
+        version_array.copy_from_slice(&data[..4]);
+        if u32::from_be_bytes(version_array) != RLINK_VERSION {
+            return Err(".rlink file was produced with encoding version {version_array}, but the current version is {RLINK_VERSION}".to_string());
+        }
+
+        let mut decoder = MemDecoder::new(&data[4..], 0);
+        let rustc_version = decoder.read_str();
+        let current_version = RUSTC_VERSION.unwrap();
+        if rustc_version != current_version {
+            return Err(format!(
+                ".rlink file was produced by rustc version {rustc_version}, but the current version is {current_version}."
+            ));
+        }
+
+        let codegen_results = CodegenResults::decode(&mut decoder);
+        Ok(codegen_results)
+    }
+}