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Cleanup for "Support compiling rustc without LLVM (try 2)" #43842

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merged 7 commits into from
Aug 14, 2017
Merged

Cleanup for "Support compiling rustc without LLVM (try 2)" #43842

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03584a2
Less cfg's
bjorn3 Aug 12, 2017
0c97bbf
Remove some more cfg's
bjorn3 Aug 13, 2017
6135b2d
Fix tidy errors
bjorn3 Aug 13, 2017
bf0eb6a
Change a #[cfg()] to a cfg!()
bjorn3 Aug 13, 2017
1c28cf5
Change run-make ignore message
bjorn3 Aug 13, 2017
61ab991
Update driver.rs
bjorn3 Aug 13, 2017
005bc2c
Fix error
bjorn3 Aug 13, 2017
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43 changes: 26 additions & 17 deletions src/bootstrap/check.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -618,12 +618,6 @@ impl Step for Compiletest {
if let Some(ref dir) = build.lldb_python_dir {
cmd.arg("--lldb-python-dir").arg(dir);
}
let llvm_config = build.llvm_config(target);
let llvm_version = output(Command::new(&llvm_config).arg("--version"));
cmd.arg("--llvm-version").arg(llvm_version);
if !build.is_rust_llvm(target) {
cmd.arg("--system-llvm");
}

cmd.args(&build.flags.cmd.test_args());

Expand All @@ -635,17 +629,32 @@ impl Step for Compiletest {
cmd.arg("--quiet");
}

// Only pass correct values for these flags for the `run-make` suite as it
// requires that a C++ compiler was configured which isn't always the case.
if suite == "run-make" {
let llvm_components = output(Command::new(&llvm_config).arg("--components"));
let llvm_cxxflags = output(Command::new(&llvm_config).arg("--cxxflags"));
cmd.arg("--cc").arg(build.cc(target))
.arg("--cxx").arg(build.cxx(target).unwrap())
.arg("--cflags").arg(build.cflags(target).join(" "))
.arg("--llvm-components").arg(llvm_components.trim())
.arg("--llvm-cxxflags").arg(llvm_cxxflags.trim());
} else {
if build.config.llvm_enabled {
let llvm_config = build.llvm_config(target);
let llvm_version = output(Command::new(&llvm_config).arg("--version"));
cmd.arg("--llvm-version").arg(llvm_version);
if !build.is_rust_llvm(target) {
cmd.arg("--system-llvm");
}

// Only pass correct values for these flags for the `run-make` suite as it
// requires that a C++ compiler was configured which isn't always the case.
if suite == "run-make" {
let llvm_components = output(Command::new(&llvm_config).arg("--components"));
let llvm_cxxflags = output(Command::new(&llvm_config).arg("--cxxflags"));
cmd.arg("--cc").arg(build.cc(target))
.arg("--cxx").arg(build.cxx(target).unwrap())
.arg("--cflags").arg(build.cflags(target).join(" "))
.arg("--llvm-components").arg(llvm_components.trim())
.arg("--llvm-cxxflags").arg(llvm_cxxflags.trim());
}
}
if suite == "run-make" && !build.config.llvm_enabled {
println!("Ignoring run-make test suite as they generally dont work without LLVM");
return;
}

if suite != "run-make" {
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This "run-make" string appears at least 3 times; maybe it would be worth making it a named constant?

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I'd be happy to see a PR which moved all the suites to an enum. I'm not sure that the diff would look good, but if it does seems like a good improvement. Please file an issue if you'd like to implement something like that.

cmd.arg("--cc").arg("")
.arg("--cxx").arg("")
.arg("--cflags").arg("")
Expand Down
62 changes: 27 additions & 35 deletions src/librustc_driver/driver.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![cfg_attr(not(feature="llvm"), allow(dead_code))]

use rustc::hir::{self, map as hir_map};
use rustc::hir::lowering::lower_crate;
use rustc::ich::Fingerprint;
Expand All @@ -19,8 +21,6 @@ use rustc::session::config::{self, Input, OutputFilenames, OutputType};
use rustc::session::search_paths::PathKind;
use rustc::lint;
use rustc::middle::{self, stability, reachable};
#[cfg(feature="llvm")]
use rustc::middle::dependency_format;
use rustc::middle::privacy::AccessLevels;
use rustc::mir::transform::{MIR_CONST, MIR_VALIDATED, MIR_OPTIMIZED, Passes};
use rustc::ty::{self, TyCtxt, Resolutions, GlobalArenas};
Expand All @@ -33,9 +33,7 @@ use rustc_incremental::{self, IncrementalHashesMap};
use rustc_resolve::{MakeGlobMap, Resolver};
use rustc_metadata::creader::CrateLoader;
use rustc_metadata::cstore::{self, CStore};
#[cfg(feature="llvm")]
use rustc_trans::back::{link, write};
#[cfg(feature="llvm")]
use rustc_trans::back::write;
use rustc_trans as trans;
use rustc_typeck as typeck;
use rustc_privacy;
Expand Down Expand Up @@ -73,11 +71,7 @@ pub fn compile_input(sess: &Session,
output: &Option<PathBuf>,
addl_plugins: Option<Vec<String>>,
control: &CompileController) -> CompileResult {
#[cfg(feature="llvm")]
use rustc_trans::back::write::OngoingCrateTranslation;
#[cfg(not(feature="llvm"))]
type OngoingCrateTranslation = ();

macro_rules! controller_entry_point {
($point: ident, $tsess: expr, $make_state: expr, $phase_result: expr) => {{
let state = &mut $make_state;
Expand All @@ -94,6 +88,23 @@ pub fn compile_input(sess: &Session,
}}
}

if cfg!(not(feature="llvm")) {
use rustc::session::config::CrateType;
if !sess.opts.debugging_opts.no_trans && sess.opts.output_types.should_trans() {
sess.err("LLVM is not supported by this rustc. Please use -Z no-trans to compile")
}

if sess.opts.crate_types.iter().all(|&t|{
t != CrateType::CrateTypeRlib && t != CrateType::CrateTypeExecutable
}) && !sess.opts.crate_types.is_empty() {
sess.err(
"LLVM is not supported by this rustc, so non rlib libraries are not supported"
);
}

sess.abort_if_errors();
}

// We need nested scopes here, because the intermediate results can keep
// large chunks of memory alive and we want to free them as soon as
// possible to keep the peak memory usage low
Expand Down Expand Up @@ -217,7 +228,6 @@ pub fn compile_input(sess: &Session,
tcx.print_debug_stats();
}

#[cfg(feature="llvm")]
let trans = phase_4_translate_to_llvm(tcx, analysis, incremental_hashes_map,
&outputs);

Expand All @@ -233,24 +243,13 @@ pub fn compile_input(sess: &Session,
}
}

#[cfg(not(feature="llvm"))]
{
let _ = incremental_hashes_map;
sess.err(&format!("LLVM is not supported by this rustc"));
sess.abort_if_errors();
unreachable!();
}

#[cfg(feature="llvm")]
Ok((outputs, trans))
})??
};

#[cfg(not(feature="llvm"))]
{
let _ = outputs;
let _ = trans;
unreachable!();
if cfg!(not(feature="llvm")) {
let (_, _) = (outputs, trans);
sess.fatal("LLVM is not supported by this rustc");
}

#[cfg(feature="llvm")]
Expand Down Expand Up @@ -393,7 +392,6 @@ pub struct CompileState<'a, 'tcx: 'a> {
pub resolutions: Option<&'a Resolutions>,
pub analysis: Option<&'a ty::CrateAnalysis>,
pub tcx: Option<TyCtxt<'a, 'tcx, 'tcx>>,
#[cfg(feature="llvm")]
pub trans: Option<&'a trans::CrateTranslation>,
}

Expand All @@ -420,7 +418,6 @@ impl<'a, 'tcx> CompileState<'a, 'tcx> {
resolutions: None,
analysis: None,
tcx: None,
#[cfg(feature="llvm")]
trans: None,
}
}
Expand Down Expand Up @@ -509,7 +506,6 @@ impl<'a, 'tcx> CompileState<'a, 'tcx> {
}
}

#[cfg(feature="llvm")]
fn state_after_llvm(input: &'a Input,
session: &'tcx Session,
out_dir: &'a Option<PathBuf>,
Expand All @@ -523,7 +519,6 @@ impl<'a, 'tcx> CompileState<'a, 'tcx> {
}
}

#[cfg(feature="llvm")]
fn state_when_compilation_done(input: &'a Input,
session: &'tcx Session,
out_dir: &'a Option<PathBuf>,
Expand Down Expand Up @@ -942,7 +937,6 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
mir::provide(&mut local_providers);
reachable::provide(&mut local_providers);
rustc_privacy::provide(&mut local_providers);
#[cfg(feature="llvm")]
trans::provide(&mut local_providers);
typeck::provide(&mut local_providers);
ty::provide(&mut local_providers);
Expand All @@ -955,7 +949,6 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,

let mut extern_providers = ty::maps::Providers::default();
cstore::provide(&mut extern_providers);
#[cfg(feature="llvm")]
trans::provide(&mut extern_providers);
ty::provide_extern(&mut extern_providers);
traits::provide_extern(&mut extern_providers);
Expand Down Expand Up @@ -1102,7 +1095,6 @@ pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,

/// Run the translation phase to LLVM, after which the AST and analysis can
/// be discarded.
#[cfg(feature="llvm")]
pub fn phase_4_translate_to_llvm<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
analysis: ty::CrateAnalysis,
incremental_hashes_map: IncrementalHashesMap,
Expand All @@ -1112,7 +1104,7 @@ pub fn phase_4_translate_to_llvm<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,

time(time_passes,
"resolving dependency formats",
|| dependency_format::calculate(tcx));
|| ::rustc::middle::dependency_format::calculate(tcx));

let translation =
time(time_passes,
Expand Down Expand Up @@ -1147,9 +1139,9 @@ pub fn phase_5_run_llvm_passes(sess: &Session,
pub fn phase_6_link_output(sess: &Session,
trans: &trans::CrateTranslation,
outputs: &OutputFilenames) {
time(sess.time_passes(),
"linking",
|| link::link_binary(sess, trans, outputs, &trans.crate_name.as_str()));
time(sess.time_passes(), "linking", || {
::rustc_trans::back::link::link_binary(sess, trans, outputs, &trans.crate_name.as_str())
});
}

fn escape_dep_filename(filename: &str) -> String {
Expand Down
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