136 lines
5.2 KiB
Rust
136 lines
5.2 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use back::archive::ArchiveRO;
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use back::link;
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use driver::session;
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use driver::config;
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use lib::llvm::{ModuleRef, TargetMachineRef, llvm, True, False};
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use metadata::cstore;
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use util::common::time;
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use libc;
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use flate;
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pub fn run(sess: &session::Session, llmod: ModuleRef,
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tm: TargetMachineRef, reachable: &[String]) {
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if sess.opts.cg.prefer_dynamic {
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sess.err("cannot prefer dynamic linking when performing LTO");
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sess.note("only 'staticlib' and 'bin' outputs are supported with LTO");
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sess.abort_if_errors();
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}
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// Make sure we actually can run LTO
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for crate_type in sess.crate_types.borrow().iter() {
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match *crate_type {
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config::CrateTypeExecutable | config::CrateTypeStaticlib => {}
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_ => {
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sess.fatal("lto can only be run for executables and \
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static library outputs");
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}
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}
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}
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// For each of our upstream dependencies, find the corresponding rlib and
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// load the bitcode from the archive. Then merge it into the current LLVM
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// module that we've got.
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let crates = sess.cstore.get_used_crates(cstore::RequireStatic);
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for (cnum, path) in crates.move_iter() {
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let name = sess.cstore.get_crate_data(cnum).name.clone();
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let path = match path {
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Some(p) => p,
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None => {
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sess.fatal(format!("could not find rlib for: `{}`",
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name).as_slice());
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}
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};
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let archive = ArchiveRO::open(&path).expect("wanted an rlib");
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debug!("reading {}", name);
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let bc = time(sess.time_passes(),
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format!("read {}.bc.deflate", name).as_slice(),
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(),
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|_| {
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archive.read(format!("{}.bc.deflate",
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name).as_slice())
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});
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let bc = bc.expect("missing compressed bytecode in archive!");
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let bc = time(sess.time_passes(),
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format!("inflate {}.bc", name).as_slice(),
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(),
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|_| {
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match flate::inflate_bytes(bc) {
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Some(bc) => bc,
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None => {
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sess.fatal(format!("failed to decompress \
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bc of `{}`",
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name).as_slice())
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}
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}
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});
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let ptr = bc.as_slice().as_ptr();
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debug!("linking {}", name);
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time(sess.time_passes(),
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format!("ll link {}", name).as_slice(),
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(),
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|()| unsafe {
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if !llvm::LLVMRustLinkInExternalBitcode(llmod,
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ptr as *libc::c_char,
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bc.len() as libc::size_t) {
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link::llvm_err(sess,
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format!("failed to load bc of `{}`",
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name.as_slice()));
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}
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});
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}
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// Internalize everything but the reachable symbols of the current module
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let cstrs: Vec<::std::c_str::CString> =
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reachable.iter().map(|s| s.as_slice().to_c_str()).collect();
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let arr: Vec<*i8> = cstrs.iter().map(|c| c.with_ref(|p| p)).collect();
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let ptr = arr.as_ptr();
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unsafe {
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llvm::LLVMRustRunRestrictionPass(llmod, ptr as **libc::c_char,
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arr.len() as libc::size_t);
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}
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if sess.no_landing_pads() {
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unsafe {
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llvm::LLVMRustMarkAllFunctionsNounwind(llmod);
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}
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}
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// Now we have one massive module inside of llmod. Time to run the
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// LTO-specific optimization passes that LLVM provides.
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//
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// This code is based off the code found in llvm's LTO code generator:
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// tools/lto/LTOCodeGenerator.cpp
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debug!("running the pass manager");
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unsafe {
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let pm = llvm::LLVMCreatePassManager();
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llvm::LLVMRustAddAnalysisPasses(tm, pm, llmod);
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"verify".with_c_str(|s| llvm::LLVMRustAddPass(pm, s));
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let builder = llvm::LLVMPassManagerBuilderCreate();
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llvm::LLVMPassManagerBuilderPopulateLTOPassManager(builder, pm,
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/* Internalize = */ False,
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/* RunInliner = */ True);
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llvm::LLVMPassManagerBuilderDispose(builder);
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"verify".with_c_str(|s| llvm::LLVMRustAddPass(pm, s));
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time(sess.time_passes(), "LTO pases", (), |()|
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llvm::LLVMRunPassManager(pm, llmod));
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llvm::LLVMDisposePassManager(pm);
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}
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debug!("lto done");
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}
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