Contracts core intrinsics.

These are hooks to:

  1. control whether contract checks are run
  2. allow 3rd party tools to intercept and reintepret the results of running contracts.

compiler/rustc_session/src/config/cfg.rs

@@ -119,6 +119,7 @@ pub(crate) fn disallow_cfgs(sess: &Session, user_cfgs: &Cfg) {
             (sym::overflow_checks, None) => disallow(cfg, "-C overflow-checks"),
             (sym::debug_assertions, None) => disallow(cfg, "-C debug-assertions"),
             (sym::ub_checks, None) => disallow(cfg, "-Z ub-checks"),
+            (sym::contract_checks, None) => disallow(cfg, "-Z contract-checks"),
             (sym::sanitize, None | Some(_)) => disallow(cfg, "-Z sanitizer"),
             (
                 sym::sanitizer_cfi_generalize_pointers | sym::sanitizer_cfi_normalize_integers,
@@ -300,6 +301,11 @@ pub(crate) fn default_configuration(sess: &Session) -> Cfg {
     if sess.is_nightly_build() && sess.opts.unstable_opts.emscripten_wasm_eh {
         ins_none!(sym::emscripten_wasm_eh);
     }
+
+    if sess.contract_checks() {
+        ins_none!(sym::contract_checks);
+    }
+
     ret
 }
 
@@ -464,6 +470,7 @@ impl CheckCfg {
         ins!(sym::target_thread_local, no_values);
 
         ins!(sym::ub_checks, no_values);
+        ins!(sym::contract_checks, no_values);
 
         ins!(sym::unix, no_values);
         ins!(sym::windows, no_values);

compiler/rustc_session/src/options.rs

@@ -2114,6 +2114,8 @@ options! {
         "the backend to use"),
     combine_cgu: bool = (false, parse_bool, [TRACKED],
         "combine CGUs into a single one"),
+    contract_checks: Option<bool> = (None, parse_opt_bool, [TRACKED],
+        "emit runtime checks for contract pre- and post-conditions (default: no)"),
     coverage_options: CoverageOptions = (CoverageOptions::default(), parse_coverage_options, [TRACKED],
         "control details of coverage instrumentation"),
     crate_attr: Vec<String> = (Vec::new(), parse_string_push, [TRACKED],

compiler/rustc_session/src/session.rs

@@ -709,6 +709,10 @@ impl Session {
         self.opts.unstable_opts.ub_checks.unwrap_or(self.opts.debug_assertions)
     }
 
+    pub fn contract_checks(&self) -> bool {
+        self.opts.unstable_opts.contract_checks.unwrap_or(false)
+    }
+
     pub fn relocation_model(&self) -> RelocModel {
         self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model)
     }