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proc_macro: use crossbeam channels for the proc_macro cross-thread bridge

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This is done by having the crossbeam dependency inserted into the
proc_macro server code from the server side, to avoid adding a
dependency to proc_macro.

In addition, this introduces a -Z command-line option which will switch
rustc to run proc-macros using this cross-thread executor. With the
changes to the bridge in #98186, #98187, #98188 and #98189, the
performance of the executor should be much closer to same-thread
execution.

In local testing, the crossbeam executor was substantially more
performant than either of the two existing CrossThread strategies, so
they have been removed to keep things simple.
This commit is contained in:
Nika Layzell 2022-06-18 14:15:03 -04:00
parent 2f847b81a0
commit 6d1650fe45
8 changed files with 133 additions and 80 deletions
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3
compiler/rustc_interface/src/tests.rs
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@ -11,7 +11,7 @@ use rustc_session::config::{
};
use rustc_session::config::{
BranchProtection, Externs, OomStrategy, OutputType, OutputTypes, PAuthKey, PacRet,
SymbolManglingVersion, WasiExecModel,
ProcMacroExecutionStrategy, SymbolManglingVersion, WasiExecModel,
};
use rustc_session::config::{CFGuard, ExternEntry, LinkerPluginLto, LtoCli, SwitchWithOptPath};
use rustc_session::lint::Level;
@ -685,6 +685,7 @@ fn test_unstable_options_tracking_hash() {
untracked!(print_mono_items, Some(String::from("abc")));
untracked!(print_type_sizes, true);
untracked!(proc_macro_backtrace, true);
untracked!(proc_macro_execution_strategy, ProcMacroExecutionStrategy::CrossThread);
untracked!(query_dep_graph, true);
untracked!(save_analysis, true);
untracked!(self_profile, SwitchWithOptPath::Enabled(None));