bjoernager/rust
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Allow disabling TrapUnreachable via -Ztrap-unreachable=no

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This is useful for embedded targets where small code size is desired.
For example, on my project (thumbv7em-none-eabi) this yields a 0.6% code size reduction.
This commit is contained in:
Dario Nieuwenhuis 2020-11-24 00:55:10 +01:00
parent d9a105fdd4
commit 7b62e09b03
3 changed files with 5 additions and 1 deletions
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3
compiler/rustc_codegen_llvm/src/back/write.rs
View file

@ -152,7 +152,8 @@ pub fn target_machine_factory(
let features = features.join(","); let features = features.join(",");
let features = CString::new(features).unwrap(); let features = CString::new(features).unwrap();
let abi = SmallCStr::new(&sess.target.llvm_abiname); let abi = SmallCStr::new(&sess.target.llvm_abiname);
let trap_unreachable = sess.target.trap_unreachable; let trap_unreachable =
sess.opts.debugging_opts.trap_unreachable.unwrap_or(sess.target.trap_unreachable);
let emit_stack_size_section = sess.opts.debugging_opts.emit_stack_sizes; let emit_stack_size_section = sess.opts.debugging_opts.emit_stack_sizes;
let asm_comments = sess.asm_comments(); let asm_comments = sess.asm_comments();

1
compiler/rustc_interface/src/tests.rs
View file

@ -592,6 +592,7 @@ fn test_debugging_options_tracking_hash() {
tracked!(thinlto, Some(true)); tracked!(thinlto, Some(true));
tracked!(tune_cpu, Some(String::from("abc"))); tracked!(tune_cpu, Some(String::from("abc")));
tracked!(tls_model, Some(TlsModel::GeneralDynamic)); tracked!(tls_model, Some(TlsModel::GeneralDynamic));
tracked!(trap_unreachable, Some(false));
tracked!(treat_err_as_bug, Some(1)); tracked!(treat_err_as_bug, Some(1));
tracked!(unleash_the_miri_inside_of_you, true); tracked!(unleash_the_miri_inside_of_you, true);
tracked!(use_ctors_section, Some(true)); tracked!(use_ctors_section, Some(true));

2
compiler/rustc_session/src/options.rs
View file

@ -1113,6 +1113,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
"choose the TLS model to use (`rustc --print tls-models` for details)"), "choose the TLS model to use (`rustc --print tls-models` for details)"),
trace_macros: bool = (false, parse_bool, [UNTRACKED], trace_macros: bool = (false, parse_bool, [UNTRACKED],
"for every macro invocation, print its name and arguments (default: no)"), "for every macro invocation, print its name and arguments (default: no)"),
trap_unreachable: Option<bool> = (None, parse_opt_bool, [TRACKED],
"generate trap instructions for unreachable intrinsics (default: use target setting, usually yes)"),
treat_err_as_bug: Option<usize> = (None, parse_treat_err_as_bug, [TRACKED], treat_err_as_bug: Option<usize> = (None, parse_treat_err_as_bug, [TRACKED],
"treat error number `val` that occurs as bug"), "treat error number `val` that occurs as bug"),
trim_diagnostic_paths: bool = (true, parse_bool, [UNTRACKED], trim_diagnostic_paths: bool = (true, parse_bool, [UNTRACKED],