diff options
Diffstat (limited to 'compiler/rustc_codegen_gcc/src/back/lto.rs')
| -rw-r--r-- | compiler/rustc_codegen_gcc/src/back/lto.rs | 94 |
1 files changed, 53 insertions, 41 deletions
diff --git a/compiler/rustc_codegen_gcc/src/back/lto.rs b/compiler/rustc_codegen_gcc/src/back/lto.rs index c21b7686823..61e0f203ee0 100644 --- a/compiler/rustc_codegen_gcc/src/back/lto.rs +++ b/compiler/rustc_codegen_gcc/src/back/lto.rs @@ -1,7 +1,6 @@ /// GCC requires to use the same toolchain for the whole compilation when doing LTO. /// So, we need the same version/commit of the linker (gcc) and lto front-end binaries (lto1, /// lto-wrapper, liblto_plugin.so). - // FIXME(antoyo): the executables compiled with LTO are bigger than those compiled without LTO. // Since it is the opposite for cg_llvm, check if this is normal. // @@ -17,7 +16,6 @@ // /usr/bin/ld: warning: type of symbol `_RNvNvNvNtCs5JWOrf9uCus_5rayon11thread_pool19WORKER_THREAD_STATE7___getit5___KEY' changed from 1 to 6 in /tmp/ccKeUSiR.ltrans0.ltrans.o // /usr/bin/ld: warning: type of symbol `_RNvNvNvNvNtNtNtCsAj5i4SGTR7_3std4sync4mpmc5waker17current_thread_id5DUMMY7___getit5___KEY' changed from 1 to 6 in /tmp/ccKeUSiR.ltrans0.ltrans.o // /usr/bin/ld: warning: incremental linking of LTO and non-LTO objects; using -flinker-output=nolto-rel which will bypass whole program optimization - use std::ffi::CString; use std::fs::{self, File}; use std::path::{Path, PathBuf}; @@ -30,18 +28,16 @@ use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput}; use rustc_codegen_ssa::traits::*; use rustc_codegen_ssa::{looks_like_rust_object_file, ModuleCodegen, ModuleKind}; use rustc_data_structures::memmap::Mmap; -use rustc_errors::{FatalError, DiagCtxt}; +use rustc_errors::{DiagCtxt, FatalError}; use rustc_hir::def_id::LOCAL_CRATE; use rustc_middle::dep_graph::WorkProduct; use rustc_middle::middle::exported_symbols::{SymbolExportInfo, SymbolExportLevel}; use rustc_session::config::{CrateType, Lto}; -use tempfile::{TempDir, tempdir}; +use tempfile::{tempdir, TempDir}; use crate::back::write::save_temp_bitcode; -use crate::errors::{ - DynamicLinkingWithLTO, LtoBitcodeFromRlib, LtoDisallowed, LtoDylib, -}; -use crate::{GccCodegenBackend, GccContext, to_gcc_opt_level}; +use crate::errors::{DynamicLinkingWithLTO, LtoBitcodeFromRlib, LtoDisallowed, LtoDylib}; +use crate::{to_gcc_opt_level, GccCodegenBackend, GccContext}; /// We keep track of the computed LTO cache keys from the previous /// session to determine which CGUs we can reuse. @@ -61,7 +57,10 @@ struct LtoData { tmp_path: TempDir, } -fn prepare_lto(cgcx: &CodegenContext<GccCodegenBackend>, dcx: &DiagCtxt) -> Result<LtoData, FatalError> { +fn prepare_lto( + cgcx: &CodegenContext<GccCodegenBackend>, + dcx: &DiagCtxt, +) -> Result<LtoData, FatalError> { let export_threshold = match cgcx.lto { // We're just doing LTO for our one crate Lto::ThinLocal => SymbolExportLevel::Rust, @@ -72,14 +71,13 @@ fn prepare_lto(cgcx: &CodegenContext<GccCodegenBackend>, dcx: &DiagCtxt) -> Resu Lto::No => panic!("didn't request LTO but we're doing LTO"), }; - let tmp_path = - match tempdir() { - Ok(tmp_path) => tmp_path, - Err(error) => { - eprintln!("Cannot create temporary directory: {}", error); - return Err(FatalError); - }, - }; + let tmp_path = match tempdir() { + Ok(tmp_path) => tmp_path, + Err(error) => { + eprintln!("Cannot create temporary directory: {}", error); + return Err(FatalError); + } + }; let symbol_filter = &|&(ref name, info): &(String, SymbolExportInfo)| { if info.level.is_below_threshold(export_threshold) || info.used { @@ -108,11 +106,10 @@ fn prepare_lto(cgcx: &CodegenContext<GccCodegenBackend>, dcx: &DiagCtxt) -> Resu if !crate_type_allows_lto(*crate_type) { dcx.emit_err(LtoDisallowed); return Err(FatalError); - } else if *crate_type == CrateType::Dylib { - if !cgcx.opts.unstable_opts.dylib_lto { - dcx.emit_err(LtoDylib); - return Err(FatalError); - } + } + if *crate_type == CrateType::Dylib && !cgcx.opts.unstable_opts.dylib_lto { + dcx.emit_err(LtoDylib); + return Err(FatalError); } } @@ -125,8 +122,7 @@ fn prepare_lto(cgcx: &CodegenContext<GccCodegenBackend>, dcx: &DiagCtxt) -> Resu let exported_symbols = cgcx.exported_symbols.as_ref().expect("needs exported symbols for LTO"); { - let _timer = - cgcx.prof.generic_activity("GCC_lto_generate_symbols_below_threshold"); + let _timer = cgcx.prof.generic_activity("GCC_lto_generate_symbols_below_threshold"); symbols_below_threshold .extend(exported_symbols[&cnum].iter().filter_map(symbol_filter)); } @@ -170,10 +166,9 @@ fn prepare_lto(cgcx: &CodegenContext<GccCodegenBackend>, dcx: &DiagCtxt) -> Resu } fn save_as_file(obj: &[u8], path: &Path) -> Result<(), LtoBitcodeFromRlib> { - fs::write(path, obj) - .map_err(|error| LtoBitcodeFromRlib { - gcc_err: format!("write object file to temp dir: {}", error) - }) + fs::write(path, obj).map_err(|error| LtoBitcodeFromRlib { + gcc_err: format!("write object file to temp dir: {}", error), + }) } /// Performs fat LTO by merging all modules into a single one and returning it @@ -186,13 +181,25 @@ pub(crate) fn run_fat( let dcx = cgcx.create_dcx(); let lto_data = prepare_lto(cgcx, &dcx)?; /*let symbols_below_threshold = - lto_data.symbols_below_threshold.iter().map(|c| c.as_ptr()).collect::<Vec<_>>();*/ - fat_lto(cgcx, &dcx, modules, cached_modules, lto_data.upstream_modules, lto_data.tmp_path, + lto_data.symbols_below_threshold.iter().map(|c| c.as_ptr()).collect::<Vec<_>>();*/ + fat_lto( + cgcx, + &dcx, + modules, + cached_modules, + lto_data.upstream_modules, + lto_data.tmp_path, //&symbols_below_threshold, ) } -fn fat_lto(cgcx: &CodegenContext<GccCodegenBackend>, _dcx: &DiagCtxt, modules: Vec<FatLtoInput<GccCodegenBackend>>, cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>, mut serialized_modules: Vec<(SerializedModule<ModuleBuffer>, CString)>, tmp_path: TempDir, +fn fat_lto( + cgcx: &CodegenContext<GccCodegenBackend>, + _dcx: &DiagCtxt, + modules: Vec<FatLtoInput<GccCodegenBackend>>, + cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>, + mut serialized_modules: Vec<(SerializedModule<ModuleBuffer>, CString)>, + tmp_path: TempDir, //symbols_below_threshold: &[*const libc::c_char], ) -> Result<LtoModuleCodegen<GccCodegenBackend>, FatalError> { let _timer = cgcx.prof.generic_activity("GCC_fat_lto_build_monolithic_module"); @@ -298,10 +305,15 @@ fn fat_lto(cgcx: &CodegenContext<GccCodegenBackend>, _dcx: &DiagCtxt, modules: V match bc_decoded { SerializedModule::Local(ref module_buffer) => { module.module_llvm.should_combine_object_files = true; - module.module_llvm.context.add_driver_option(module_buffer.0.to_str().expect("path")); - }, + module + .module_llvm + .context + .add_driver_option(module_buffer.0.to_str().expect("path")); + } SerializedModule::FromRlib(_) => unimplemented!("from rlib"), - SerializedModule::FromUncompressedFile(_) => unimplemented!("from uncompressed file"), + SerializedModule::FromUncompressedFile(_) => { + unimplemented!("from uncompressed file") + } } serialized_bitcode.push(bc_decoded); } @@ -309,13 +321,13 @@ fn fat_lto(cgcx: &CodegenContext<GccCodegenBackend>, _dcx: &DiagCtxt, modules: V // Internalize everything below threshold to help strip out more modules and such. /*unsafe { - let ptr = symbols_below_threshold.as_ptr(); - llvm::LLVMRustRunRestrictionPass( - llmod, - ptr as *const *const libc::c_char, - symbols_below_threshold.len() as libc::size_t, - );*/ - save_temp_bitcode(cgcx, &module, "lto.after-restriction"); + let ptr = symbols_below_threshold.as_ptr(); + llvm::LLVMRustRunRestrictionPass( + llmod, + ptr as *const *const libc::c_char, + symbols_below_threshold.len() as libc::size_t, + );*/ + save_temp_bitcode(cgcx, &module, "lto.after-restriction"); //} } |