From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- compiler/rustc_codegen_ssa/src/lib.rs | 244 ++++++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) create mode 100644 compiler/rustc_codegen_ssa/src/lib.rs (limited to 'compiler/rustc_codegen_ssa/src/lib.rs') 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 { + /// 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 ModuleCodegen { + 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, + pub dwarf_object: Option, + pub bytecode: Option, +} + +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, + pub cfg: Option, + pub verbatim: Option, + pub dll_imports: Vec, +} + +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>, + pub linked_symbols: FxHashMap>, + pub local_crate_name: Symbol, + pub compiler_builtins: Option, + pub profiler_runtime: Option, + pub is_no_builtins: FxHashSet, + pub native_libraries: FxHashMap>, + pub crate_name: FxHashMap, + pub used_libraries: Vec, + pub used_crate_source: FxHashMap>, + pub used_crates: Vec, + pub lang_item_to_crate: FxHashMap, + pub missing_lang_items: FxHashMap>, + pub dependency_formats: Lrc, + pub windows_subsystem: Option, + pub natvis_debugger_visualizers: BTreeSet, +} + +#[derive(Encodable, Decodable)] +pub struct CodegenResults { + pub modules: Vec, + pub allocator_module: Option, + pub metadata_module: Option, + 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 { + 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) -> Result { + // 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) + } +} -- cgit v1.2.3