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add -Z mir-opt-level to disable MIR optimizations

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setting -Z mir-opt-level=0 will disable all MIR optimizations
for easier debugging
This commit is contained in:
Ariel Ben-Yehuda 2016-02-07 22:46:39 +02:00 committed by Ariel Ben-Yehuda
parent addc653da5
commit 999f1767ca
2 changed files with 9 additions and 2 deletions
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6
src/librustc/session/config.rs
View file

@ -138,6 +138,7 @@ pub struct Options {
pub no_trans: bool,
pub error_format: ErrorOutputType,
pub treat_err_as_bug: bool,
pub mir_opt_level: usize,
/// if true, build up the dep-graph
pub build_dep_graph: bool,
@ -254,6 +255,7 @@ pub fn basic_options() -> Options {
parse_only: false,
no_trans: false,
treat_err_as_bug: false,
mir_opt_level: 1,
build_dep_graph: false,
dump_dep_graph: false,
no_analysis: false,
@ -655,6 +657,8 @@ fn parse_passes(slot: &mut Passes, v: Option<&str>) -> bool {
"show spans for compiler debugging (expr|pat|ty)"),
print_trans_items: Option<String> = (None, parse_opt_string,
"print the result of the translation item collection pass"),
mir_opt_level: Option<usize> = (None, parse_opt_uint,
"set the MIR optimization level (0-3)"),
}
pub fn default_lib_output() -> CrateType {
@ -988,6 +992,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
let parse_only = debugging_opts.parse_only;
let no_trans = debugging_opts.no_trans;
let treat_err_as_bug = debugging_opts.treat_err_as_bug;
let mir_opt_level = debugging_opts.mir_opt_level.unwrap_or(1);
let incremental_compilation = debugging_opts.incr_comp;
let dump_dep_graph = debugging_opts.dump_dep_graph;
let no_analysis = debugging_opts.no_analysis;
@ -1166,6 +1171,7 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
parse_only: parse_only,
no_trans: no_trans,
treat_err_as_bug: treat_err_as_bug,
mir_opt_level: mir_opt_level,
build_dep_graph: incremental_compilation || dump_dep_graph,
dump_dep_graph: dump_dep_graph,
no_analysis: no_analysis,

5
src/librustc_mir/mir_map.rs
View file

@ -148,10 +148,11 @@ fn visit_fn(&mut self,
match build_mir(Cx::new(&infcx), implicit_arg_tys, id, span, decl, body) {
Ok(mut mir) => {
simplify_cfg::SimplifyCfg::new().run_on_mir(&mut mir, self.tcx);
type_check::TypeckMir::new(&infcx).run_on_mir(&mut mir, self.tcx);
no_landing_pads::NoLandingPads.run_on_mir(&mut mir, self.tcx);
if self.tcx.sess.opts.mir_opt_level > 0 {
simplify_cfg::SimplifyCfg::new().run_on_mir(&mut mir, self.tcx);
}
let meta_item_list = self.attr
.iter()
.flat_map(|a| a.meta_item_list())