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Free intermediate translation results as soon as possible #8092

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Free intermediate translation results as soon as possible #8092

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19 changes: 13 additions & 6 deletions src/librustc/driver/driver.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -409,12 +409,19 @@ pub fn stop_after_phase_5(sess: Session) -> bool {
pub fn compile_input(sess: Session, cfg: ast::CrateConfig, input: &input,
outdir: &Option<Path>, output: &Option<Path>) {
let outputs = build_output_filenames(input, outdir, output, [], sess);
let crate = phase_1_parse_input(sess, cfg.clone(), input);
if stop_after_phase_1(sess) { return; }
let expanded_crate = phase_2_configure_and_expand(sess, cfg, crate);
let analysis = phase_3_run_analysis_passes(sess, expanded_crate);
if stop_after_phase_3(sess) { return; }
let trans = phase_4_translate_to_llvm(sess, expanded_crate, &analysis, outputs);
// 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
let trans = {
let expanded_crate = {
let crate = phase_1_parse_input(sess, cfg.clone(), input);
if stop_after_phase_1(sess) { return; }
phase_2_configure_and_expand(sess, cfg, crate)
};
let analysis = phase_3_run_analysis_passes(sess, expanded_crate);
if stop_after_phase_3(sess) { return; }
phase_4_translate_to_llvm(sess, expanded_crate, &analysis, outputs)
};
phase_5_run_llvm_passes(sess, &trans, outputs);
if stop_after_phase_5(sess) { return; }
phase_6_link_output(sess, &trans, outputs);
Expand Down