Auto merge of #113879 - nnethercote:codegen_ssa-cleanups, r=bjorn3

`codegen_ssa` cleanups

Some clarifications I made when reading this code closely.

r? `@tmiasko`

Author: bors

compiler/rustc_codegen_gcc/src/lib.rs

@@ -71,7 +71,7 @@ use gccjit::{Context, OptimizationLevel, CType};
 use rustc_ast::expand::allocator::AllocatorKind;
 use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleCodegen};
 use rustc_codegen_ssa::base::codegen_crate;
-use rustc_codegen_ssa::back::write::{CodegenContext, FatLTOInput, ModuleConfig, TargetMachineFactoryFn};
+use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput, ModuleConfig, TargetMachineFactoryFn};
 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
 use rustc_codegen_ssa::target_features::supported_target_features;
 use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, ModuleBufferMethods, ThinBufferMethods, WriteBackendMethods};
@@ -217,14 +217,14 @@ impl WriteBackendMethods for GccCodegenBackend {
     type ThinData = ();
     type ThinBuffer = ThinBuffer;
 
-    fn run_fat_lto(_cgcx: &CodegenContext<Self>, mut modules: Vec<FatLTOInput<Self>>, _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>) -> Result<LtoModuleCodegen<Self>, FatalError> {
+    fn run_fat_lto(_cgcx: &CodegenContext<Self>, mut modules: Vec<FatLtoInput<Self>>, _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>) -> Result<LtoModuleCodegen<Self>, FatalError> {
         // TODO(antoyo): implement LTO by sending -flto to libgccjit and adding the appropriate gcc linker plugins.
         // NOTE: implemented elsewhere.
         // TODO(antoyo): what is implemented elsewhere ^ ?
         let module =
             match modules.remove(0) {
-                FatLTOInput::InMemory(module) => module,
-                FatLTOInput::Serialized { .. } => {
+                FatLtoInput::InMemory(module) => module,
+                FatLtoInput::Serialized { .. } => {
                     unimplemented!();
                 }
             };

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -7,7 +7,7 @@ use crate::{LlvmCodegenBackend, ModuleLlvm};
 use object::read::archive::ArchiveFile;
 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule, ThinShared};
 use rustc_codegen_ssa::back::symbol_export;
-use rustc_codegen_ssa::back::write::{CodegenContext, FatLTOInput, TargetMachineFactoryConfig};
+use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput, TargetMachineFactoryConfig};
 use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::{looks_like_rust_object_file, ModuleCodegen, ModuleKind};
 use rustc_data_structures::fx::FxHashMap;
@@ -166,7 +166,7 @@ fn get_bitcode_slice_from_object_data(obj: &[u8]) -> Result<&[u8], LtoBitcodeFro
 /// for further optimization.
 pub(crate) fn run_fat(
     cgcx: &CodegenContext<LlvmCodegenBackend>,
-    modules: Vec<FatLTOInput<LlvmCodegenBackend>>,
+    modules: Vec<FatLtoInput<LlvmCodegenBackend>>,
     cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>,
 ) -> Result<LtoModuleCodegen<LlvmCodegenBackend>, FatalError> {
     let diag_handler = cgcx.create_diag_handler();
@@ -220,7 +220,7 @@ pub(crate) fn prepare_thin(module: ModuleCodegen<ModuleLlvm>) -> (String, ThinBu
 fn fat_lto(
     cgcx: &CodegenContext<LlvmCodegenBackend>,
     diag_handler: &Handler,
-    modules: Vec<FatLTOInput<LlvmCodegenBackend>>,
+    modules: Vec<FatLtoInput<LlvmCodegenBackend>>,
     cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>,
     mut serialized_modules: Vec<(SerializedModule<ModuleBuffer>, CString)>,
     symbols_below_threshold: &[*const libc::c_char],
@@ -245,8 +245,8 @@ fn fat_lto(
     }));
     for module in modules {
         match module {
-            FatLTOInput::InMemory(m) => in_memory.push(m),
-            FatLTOInput::Serialized { name, buffer } => {
+            FatLtoInput::InMemory(m) => in_memory.push(m),
+            FatLtoInput::Serialized { name, buffer } => {
                 info!("pushing serialized module {:?}", name);
                 let buffer = SerializedModule::Local(buffer);
                 serialized_modules.push((buffer, CString::new(name).unwrap()));

compiler/rustc_codegen_llvm/src/lib.rs

@@ -28,7 +28,7 @@ pub use llvm_util::target_features;
 use rustc_ast::expand::allocator::AllocatorKind;
 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
 use rustc_codegen_ssa::back::write::{
-    CodegenContext, FatLTOInput, ModuleConfig, TargetMachineFactoryConfig, TargetMachineFactoryFn,
+    CodegenContext, FatLtoInput, ModuleConfig, TargetMachineFactoryConfig, TargetMachineFactoryFn,
 };
 use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::ModuleCodegen;
@@ -141,18 +141,6 @@ impl ExtraBackendMethods for LlvmCodegenBackend {
         back::write::target_machine_factory(sess, optlvl, target_features)
     }
 
-    fn spawn_thread<F, T>(time_trace: bool, f: F) -> std::thread::JoinHandle<T>
-    where
-        F: FnOnce() -> T,
-        F: Send + 'static,
-        T: Send + 'static,
-    {
-        std::thread::spawn(move || {
-            let _profiler = TimeTraceProfiler::new(time_trace);
-            f()
-        })
-    }
-
     fn spawn_named_thread<F, T>(
         time_trace: bool,
         name: String,
@@ -212,7 +200,7 @@ impl WriteBackendMethods for LlvmCodegenBackend {
     }
     fn run_fat_lto(
         cgcx: &CodegenContext<Self>,
-        modules: Vec<FatLTOInput<Self>>,
+        modules: Vec<FatLtoInput<Self>>,
         cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
     ) -> Result<LtoModuleCodegen<Self>, FatalError> {
         back::lto::run_fat(cgcx, modules, cached_modules)